CN207475301U

CN207475301U - Electromotor cooling system

Info

Publication number: CN207475301U
Application number: CN201721028189.0U
Authority: CN
Inventors: E.德拉拉; A.巴萨内斯; B.马尼亚姆; J.迈耶; R.J.比斯库普; D.摩斯利
Original assignee: Yuan Jie Co
Current assignee: Atieva Inc; Yuan Jie Co
Priority date: 2016-08-17
Filing date: 2017-08-16
Publication date: 2018-06-08
Anticipated expiration: 2027-08-16

Abstract

A kind of electromotor cooling system is disclosed, including：Stator with alternate multiple slots and multiple stator tooths；Multiple axial cooling ducts in multiple stator tooths are integrally formed in, wherein the axis of axial cooling duct is parallel with the cylinder axis of stator；With coolant manifold component in the stator is integrally formed, coolant manifold component includes the first coolant manifold and the second coolant manifold, first coolant manifold includes more than first a holes and more than first a coolant channels, second coolant manifold includes more than second a holes and more than second a coolant channels, more than described first and second a holes are fluidly connected to the multiple axial cooling duct by a coolant channel more than first and second respectively, a hole more than described first is in fluid communication with more than described second a holes, pass through so that cooling agent is snakelike between hole a more than described first and more than second a hole, and cooling agent flows through a hole more than described first and second.

Description

Electromotor cooling system

Technical field

The utility model relates generally to the electric machine assembly of electric vehicle, can be used for cooling electricity more particularly, to one kind The efficient electromotor cooling system of the key element of thermomechanical components.

Background technology

For the consumer demand that the dire consequences for coping with continuous raised fuel price and global warming are driven, garage Industry slowly starts to receive minimum discharge, the demand of high efficiency automobile.Although some are making great efforts by designing more in the industry Efficient internal combustion engine realizes these targets, but some other, and hybrid power or all-electric driving train are integrated into its vehicle In battle array.However, in order to reach the expectation of consumer, automobile industry will not only realize more environmentally friendly transmission system and it is necessary to Performance, stroke, reliability, safety and the cost of reasonable level are kept simultaneously.

Realize low emission, the most common method of high efficiency automobile be by using wherein internal combustion engine (ICE) with one or The hybrid power transmission system of multiple motor combinations.Although hybrid vehicle provides more than traditional vehicle based on ICE High fuel mileage and the discharge of lower vehicle, but since they include internal combustion engine, they still can discharge noxious pollutant, Although compared with conventional vehicles, the emission level of hybrid vehicle reduces.Further, since include internal combustion engine and motor together The battery pack adjoint with it, so the transmission system of hybrid vehicle is usually than traditional vehicle based on ICE or all-electric The transmission system of vehicle is more complicated, leads to the raising of cost and the increase of weight.Therefore, several vehicular manufacturer are designing and are only making With a motor or the vehicle of multiple motors, so as to eliminate a pollution sources, while the complexity of transmission system is significantly reduced.

In order to realize that desired Performance And Reliability is horizontal in electric vehicle, no matter environmental condition or vehicle it is how violent Ground is driven, and it is vital that the temperature of traction electric machine, which is held in its defined working range,.Various sides are used The motor in electric vehicle is attempted and be sufficiently cool to method.For example, United States Patent (USP) 6,954,010 discloses a kind of such as electricity The device of machine, transformer or inductor, using a pile laminated plate, the hole that plurality of at least part overlaps is combined across laminate And limit multiple coolant channels.It is used to coolant channel being connected to conjunction positioned at the manifold member of the opposite end of Stacking for laminated plates Suitable coolant pump and radiator.Disclose multiple hole design, including formed straight channel identical size hole and size, Shape and/or position change the hole to form non axial channel.

United States Patent (USP) No.7,633,194 discloses a kind of system for the stator Stacking for laminated plates for being used to cool down motor.Each layer The outer periphery of plate is limited by the array of outwardly projecting pin.Cooling jacket is combined around laminate.Outwardly projecting pin is matched with chuck It closes and allows coolant flow supercooling space to be formed.

United States Patent (USP) No.7,009,317 discloses a kind of electromotor cooling system using cooling jacket (jacket).It can be with The inner surface that the cooling collar of interference fit is formed with stator includes one group of groove.Groove forms cold together with the outer surface of stator But pipeline, cooling agent are pumped by the cooling pipe.

Utility model content

The utility model provides a kind of electromotor cooling system, has the stator of multiple slots and multiple stator tooths including (i), Wherein the multiple stator tooth replaces with the multiple slot；(ii) the multiple axial coolings being formed integral in multiple stator tooths are logical Road, the axis of each axial direction cooling duct are parallel with the cylinder axis of stator；(iii) cooling being formed integral in the stator Agent manifold, wherein the coolant manifold includes the multiple axial cooling duct being fluidly connected at least one motor cooling Multiple coolant channels of agent entrance；(iv) coolant pump is used to make cooling agent (such as non-aggressive and non-conductive oil) Cycle through at least one motor coolant entrance, the coolant manifold and the multiple axial cooling duct.It is axial Cooling duct is preferably constructed in stator so that and the first end of each axial direction cooling duct terminates at stator first end face, And the second end of each axial direction cooling duct terminates at stator second end face, and wherein the first end surfaces of stator are far from stator the Two end surfaces.Preferably, there is the single axial cooling duct in each being formed integral in multiple stator tooths.It is axial cold But channel can have rectangular cross section, have fillet rectangular cross section, oval cross section, triangular-section or with circle The triangular cross section at angle.Preferably, the width of each axial cooling duct is 1 millimeter or bigger.From cylinder axis to multiple The radial distance that the outermost edge of each in axial cooling duct measures can be less than or equal to from cylinder axis to multiple The radial distance that the outermost edge of each in slot measures.Preferably, the first end of each axial cooling duct is flowed through Cooling agent directly flows through a End winding more than first, and the cooling agent for flowing through the second end of each axial cooling duct is direct Flow through the End winding of more than second.Stator can be divided into the first stationary part and the second stationary part, wherein cooling agent discrimination Pipe is formed integral between the first and second stationary parts in stator.Coolant manifold may also include corresponding to multiple cooling agents Multiple coolant ports of channel, wherein coolant ports are arranged around the periphery of manifold.Coolant manifold can by aluminium, steel, Plastics or soft-magnetic composite material (SMC) are made, it is preferable to use casting technique.Coolant manifold can also include corresponding to multiple cold The peripheral fluid of manifold is connected to axial cooling duct by but multiple radial slots of agent channel, wherein radial slot.Cooling agent discrimination Pipe can be manufactured using Sheet Metal Forming Technology.Coolant pump can circulate the coolant through at least one motor coolant entrance, cold But agent manifold, axial cooling duct and heat exchanger.

In addition the utility model provides a kind of electromotor cooling system, includes (i) with multiple slots and multiple stator tooths Stator, wherein the multiple stator tooth replaces with the multiple slot；(ii) the multiple axial directions being formed integral in multiple stator tooths Cooling duct, wherein the axis of each axial direction cooling duct is parallel with the cylinder axis of stator；(iii) is formed integral to stator In coolant manifold component, wherein coolant manifold is made of the first coolant manifold and the second manifold.First cooling agent discrimination Pipe includes a hole more than first and more than first a coolant channels, wherein a coolant channel more than first connects more than first a hole fluids It is connected to multiple axial cooling ducts.Second coolant manifold includes more than second a holes and more than second a coolant channels, wherein the More than second a holes are fluidly connected to multiple axial cooling ducts by a coolant channel more than two.In coolant manifold component, the More than second a holes of a hole more than the first of one coolant manifold and the second coolant manifold are in fluid communication so that cooling agent passes through the One manifold port flow into coolant manifold component a part, by the second manifold port leave coolant manifold component it Before, it is snakelike between hole a more than first and second to flow through.Entering multiple axial directions by more than first and second a coolant channels Before cooling duct, the second part that the cooling agent of coolant manifold component is flowed by the first manifold port flows through first and the A hole more than two.Axial cooling duct can have rectangular cross section, more preferably with rectangular cross section with rounded corners.Preferably, First and second coolant manifolds are mutually the same, although the second coolant manifold is relative to the first coolant manifold during assembly It reverses.After assembling, a coolant channel more than first can be aligned, and a hole more than first with more than second a coolant channels It can be deviated relative to more than second a holes.First coolant manifold can include at least the first punching press laminate, preferably be coated with The steel of electrical insulation material layer, and the second coolant manifold can include at least the second punching press laminate, also preferably include coating There is the steel of electrical insulation material layer.Stator can be divided into the first stationary part and the second stationary part, wherein coolant manifold group Part is formed integral between the first and second stationary parts in stator.First stationary part, the second stationary part and cooling agent Manifold component can be welded together to form single structure.Preferably, each axis corresponding with the first part of stator is flowed through To the cooling agent of the first end of cooling duct, a End winding more than first is preferably directly flowed through, and flows through with stator The cooling agent of the second end of the corresponding each axial cooling duct in two parts directly flows through a End winding more than second.Single axial direction Cooling duct can be formed integral in each stator tooth；Optionally, a pair of axial cooling duct can be formed integral to each In stator tooth.When a pair of axial cooling duct is formed integral in each stator tooth, one in a pair of axial direction cooling duct A axial direction cooling duct fully unitary can be formed in corresponding stator tooth, while the second of the axial cooling duct of a pair is axial Cooling duct can be partially or completely integrally formed in the yoke of stator.Cooling system can also include more than second axially Cooling duct, wherein at least part of each in more than second axial direction cooling duct is formed integral to the yoke of stator In, wherein it is parallel with the cylinder axis of stator corresponding to the second axis of more than second axial cooling ducts, wherein more than first More than first a holes are fluidly connected to more than second axial direction cooling duct by coolant channel, wherein a coolant channel more than second More than second a holes are fluidly connected to more than second axial direction cooling duct, and wherein flow into the cooling of coolant manifold component The second part of agent flows through the first He before more than second axial coolings are entered by more than first and second a coolant channels A hole more than second.The first end of each in multiple axial direction cooling ducts can be terminated at the first end face of stator, and And the second end of each in multiple axial cooling ducts can terminate in the first of the second end face, wherein stator of stator End face is far from stator second end face.The cooling agent for flowing through the first end of each in multiple axial cooling ducts can be direct A End winding more than first is flowed through, and the cooling agent for flowing through the second end of each in multiple axial cooling ducts can be with Directly flow through a End winding more than second.It is measured from cylinder axis to the outermost edge of each in multiple axial cooling ducts Radial distance can be less than from cylinder axis in multiple slots the outermost edge of each measure radial distance.In addition, Cooling system can include more than second axial cooling ducts, wherein each in more than second axial direction cooling duct is at least A part is formed integral in the yoke of stator, wherein the second axis and stator corresponding to more than second a axial cooling ducts Cylinder axis is parallel, leads to wherein more than first a holes are fluidly connected to more than second axial cooling by a coolant channel more than first Road, wherein more than second a holes are fluidly connected to more than second axial direction cooling duct, and its by a coolant channel more than second The second part of the middle cooling agent for flowing into coolant manifold component is entering second by more than first and second a coolant channels A hole more than first and second is flowed through before multiple axial direction cooling ducts.

One side according to the present utility model provides a kind of electromotor cooling system, including：

Stator with multiple slots and multiple stator tooths, wherein the multiple stator tooth replaces with the multiple slot；

Multiple axial cooling ducts in the multiple stator tooth are integrally formed in, wherein logical with the multiple axial cooling Each corresponding axis in road is parallel with the cylinder axis corresponding to the stator；With

The coolant manifold component being integrally formed in the stator, the coolant manifold component include the first cooling agent Manifold and the second coolant manifold, first coolant manifold include more than first a holes and more than first a coolant channels, Described in more than first a coolant channels more than described first a holes are fluidly connected to the multiple axial cooling duct, it is described Second coolant manifold includes more than second a holes and more than second a coolant channels, wherein a coolant channel more than described second will A hole more than described second is fluidly connected to the multiple axial cooling duct, a hole more than described first and more than described second a holes It is in fluid communication so that the first part of the cooling agent of the coolant manifold component is flowed by the first manifold port by the Two manifold ports are before coolant manifold component discharge, the snake between hole a more than described first and more than second a hole Shape passes through, and exists via the second part of the cooling agent of first manifold port inflow coolant manifold component Before entering the multiple axial cooling duct by more than described first and second a coolant channels, described first and the is flowed through A hole more than two.

Optionally, first coolant manifold is identical with second coolant manifold, and wherein described second cold But agent manifold reverses before being assembled in the coolant manifold component relative to first coolant manifold.

Optionally, in the coolant manifold component, a coolant channel more than described first and more than described second it is cold But agent channel alignment, and wherein in the coolant manifold component, a hole more than described first is relative to more than described second Hole deviates.

Optionally, first coolant manifold is made of at least the first punching press laminate, and wherein described second cooling Agent manifold is made of at least the second punching press laminate.

Optionally, first and second coolant manifold is respectively made of steel.

Optionally, first and second coolant manifold is respectively coated with electrical insulation material layer.

Optionally, the electromotor cooling system further includes more than second axial direction cooling duct, wherein a axis more than described second At least part of each into cooling duct is formed integral in the yoke of the stator, wherein with more than described second Each corresponding second axis in axial cooling duct is parallel with the cylinder axis of the stator, wherein described first More than described first a holes are fluidly connected to more than described second an axial direction cooling duct by multiple coolant channels, wherein described the More than described second a holes are fluidly connected to more than described second axial direction cooling duct by a coolant channel more than two, and described The second part of the inflow coolant manifold component of cooling agent leads to by more than described first and second a cooling agents Road is flowed into before described more than second axial cooling ducts, flows through a hole more than described first and second.

Another aspect according to the present utility model provides a kind of electromotor cooling system, including：

Multiple axial cooling ducts in the multiple stator tooth are integrally formed in, wherein logical with the multiple axial cooling Each corresponding axis in road is parallel with the cylinder axis corresponding to the stator；

The coolant manifold being integrally formed in the stator, the coolant manifold include multiple coolant channels, Described in multiple coolant channels the multiple axial cooling duct is fluidly connected at least one motor coolant entrance； With

Coolant pump, wherein the coolant pump circulate the coolant through at least one motor coolant entrance, The coolant manifold and the multiple axial cooling duct.

Optionally, the coolant manifold further includes the multiple cooling agent ends arranged around the periphery of the coolant manifold Mouthful, the multiple coolant ports correspond to the multiple coolant channel.

Optionally, the coolant manifold is made of aluminium, steel, plastics or soft magnetic composite material.

Optionally, the coolant manifold is manufactured using casting technique.

Optionally, the multiple coolant channel includes multiple radial slots, wherein the multiple radial slot is by the cooling The periphery of agent manifold is fluidly connected with the multiple axial cooling duct.

Optionally, the coolant manifold is manufactured using Sheet Metal Forming Technology.

Optionally, the coolant pump circulates the coolant through at least one motor coolant entrance, institute State coolant manifold, the multiple axial direction cooling duct and heat exchanger.

Optionally, the cooling agent includes oil, wherein the oil is noncorrosive and non-conductive.

Optionally, the first end of each in the multiple axial cooling duct terminates at stator first end face, and And the second end channel of each in wherein the multiple axial cooling duct terminates at stator second end face, wherein described Stator first end face is far from the stator second end face.

Optionally, the cooling agent for flowing through the first end of each in the multiple axial cooling duct directly flows Cross a End winding more than first, and wherein flow through the multiple axial cooling duct the second end of each it is described cold But agent directly flows through a End winding more than second.

Optionally, the single axial cooling duct of the multiple axial cooling duct is formed integral to the multiple stator In each of tooth.

Optionally, the axial cooling duct of a pair in the multiple axial cooling duct is formed integral to the multiple fixed In each of sub- tooth.

Optionally, the first axis cooling duct in the pair of axial cooling duct of the multiple axial cooling duct It is fully unitary to be formed in each the multiple stator tooth, and the pair of axial direction of wherein the multiple axial cooling duct is cold But the second axial cooling duct in channel is integrally formed at least partly in the yoke of the stator.

Optionally, the first axis cooling duct of the pair of axial cooling duct in the multiple axial cooling duct It is fully unitary to be formed in each the multiple stator tooth, and the pair of axial direction of wherein the multiple axial cooling duct is cold But the second of channel axial cooling duct is fully unitary is formed in the yoke of the stator.

Optionally, each in the multiple axial cooling duct is with rectangular cross section.

Optionally, the rectangular cross section has fillet.

Optionally, each in the multiple axial cooling duct is with oval cross section.

Optionally, each cross section with triangle in the multiple axial cooling duct.

Optionally, the triangular cross section has fillet.

Optionally, it is measured from the cylinder axis to the outermost edge of each in the multiple axial cooling duct First radial distance is less than second measured from the cylinder axis to the outermost edge of each in the multiple slot radially Distance.

Optionally, it is measured from the cylinder axis to the outermost edge of each in the multiple axial cooling duct First radial distance is equal to second measured from the cylinder axis to the outermost edge of each in the multiple slot radially Distance.

Optionally, each in the multiple axial cooling duct has the width of 1 millimeter or bigger.

Optionally, the stator is divided into the first stationary part and the second stationary part, and wherein described cooling agent discrimination Pipe is formed integral between first stationary part and second stationary part in the stator.

Optionally, first stationary part, second stationary part and the coolant manifold are welded together To form single structure.

Can be explained with reference to rest part and the attached drawing of book realize to the property of the utility model and advantage into One step understands.

Description of the drawings

It should be appreciated that attached drawing is only intended to illustrate rather than limits the scope of the utility model, and be not considered as by than What example was drawn.In addition, the same reference numerals on different figures are interpreted as referring to identical component or the component of similar functions.

Fig. 1 shows a part for stator laminate, this view show that the axial cooling duct of the utility model is in stator Interior position；

Fig. 2 shows a part for stator laminate, this view show that the round cooling being arranged in the yoke of stator is logical Road；

Fig. 3 shows a part for stator laminate, this view show that the axial cooling duct of ellipse；

Fig. 4 shows a part for stator laminate, this view show that the axial cooling duct of rectangle；

Fig. 5 shows a part for stator laminate, this view show that the axial cooling duct of triangle；

Fig. 6 shows a part for stator laminate, this view show that the rectangle axial direction cooling duct with fillet；

Fig. 7 shows a part for stator laminate, this view show that the triangular shaft with fillet is to cooling duct；

The Reynolds number and flow of Fig. 8 more two kinds of axial cooling ducts to graphically；

The ellipse that Fig. 9 provides the round cooling duct being arranged in the yoke of stator and is located in the tooth of stator is cold But the graphics Web publishing of the mean heat transfer coefficient of channel；

Figure 10 provides the round cooling duct that is arranged in the yoke of stator and ellipse in the tooth of stator is cold But the graphics Web publishing of the average nusselt number of channel；

Figure 11 provides the round cooling duct that is arranged in the yoke of stator and ellipse in the tooth of stator is cold But the graphics Web publishing of the average pressure drop on single channel of channel；

Figure 12 provides the simplification cross-sectional view of the motor using cooling system as described herein；

Figure 13 provides the perspective view of a part for the Stacking for laminated plates including stator as shown in figure 12；

Figure 14 provides the simplification cross-sectional view of manifold component, this view show that cooling agent surrounds the distribution of manifold；

Figure 15 provide for manifold ambient distribution cooling agent can arrangement simplification cross-sectional view；

Figure 16 provides the perspective view of a part for the preferred embodiment of coolant distribution manifold；

Figure 17 provides the perspective view of a part for another preferred embodiment of coolant distribution manifold；

Figure 18 provides the perspective disassembled view of the stator module of preferred embodiment according to the present utility model；

Figure 19 provides the perspective view of the stator module shown in Figure 18 after assembling；

Figure 20 provides the enlarged perspective of cooling manifold part shown in Figure 18；

Figure 21 provides the end-view of one of the cooling manifold shown in Figure 18 and 20；

Figure 22 provides the perspective view of the manifold component shown in Figure 18,20 and 21, wherein single cooling manifold is at final group It is aligned and is properly located relative to each other before dress；

Figure 23 provides the perspective view of the amplification of the manifold component shown in Figure 22；With

Figure 24 provides the simplification viewgraph of cross-section of a part for the coolant manifold component shown in Figure 18-23；With

Figure 25 provides a part for stator and the enlarged perspective of the axial cooling duct shown in Figure 18-23.

Specific embodiment

As it is used herein, singulative and "the" are also intended to including plural form, clearly refer to unless the context otherwise Show.As it is used herein, term " comprising ", " including ", " having " and/or "comprising" specify the feature, whole, step Suddenly, it operates, the presence of element and/or component, but does not preclude the presence or addition of other one or more features, whole, step, behaviour Make, element, component and/or a combination thereof.As used herein, term "and/or" is intended to include one or more related to symbol "/" Any and all combination for the project listed.In addition, although term the first, the second etc. can be used for describing various steps or meter It calculates, but these steps or calculates and be limited by these terms, but these terms are only used to by a step or calculating It is mutually distinguished with another step or calculating.It is calculated for example, can be calculated first and be known as second, similarly, first step can be with It is referred to as second step, similarly, the first component can be referred to as second component, and all these are all without departing from the model of the disclosure It encloses.

The described herein and motor that shows and cooling system are generally designed to vehicle (such as the electric vehicle using motor (EV)) it in, and can be used in conjunction with single speed speed changer, double-speed speed change gear or multiple-speed gear-box.Hereinafter, term " electricity Motor-car " and " EV " may be used interchangeably, and can refer to all-electric vehicle, referred to as the plug-in hybrid vehicle of PHEV, Or be HEV hybrid vehicles, wherein hybrid vehicle uses multiple propulsion sources, including power drive system.

Motor is typically due to core loss and generates heat in stacked, and due to vortex and in the conductor of large volume Generate heat.However, due to resistance copper loss, most of loss generates in the stator windings.From one kind of stator removal heat Common methods are the water legs by using cooling agent chuck, such as around the positioning of stator laminate.However, this method allows heat Point development, because it cannot effectively cool down Stator End Winding, because the chuck is not placed close enough to main heat Source, i.e. stator winding.

A kind of technology for being proved to effectively mitigate the heating problem in motor end is by such as oily cooling agent It splashes on stator terminal winding and rotor end ring.By the way that this technology is combined with cooling agent chuck as described above, can grasp Realize that significant temperature declines in the motor of work.However, even if this combination of cooling system still allows for the axial direction in motor Intermediate generation hot spot on direction, cooling agent chuck and the cooling agent sputtered on motor end are all insufficient to effectively here Heat is removed from these regions.In addition, by combining two individual cooling subsystems, such as external water leg and including pump Oil system, then overall system complexity dramatically increase, cause manufacture cost increase and reliability reduce.

In order to overcome the limitation of existing heat abstraction method, the utility model utilizes thin, long axial cooling duct 101, Its as illustrated in the example embodiment of fig. 1 be located at stator tooth 103 in, between slot 105 and near.Due to the main heat in stator Source is winding, so cooling duct 101 is set to provide the very effective dress for removing heat from electric machine assembly in tooth It puts.For example, in a case study, inventor compares the motor cooling capacity of three kinds of different heat abstraction systems：(i) root According to the axial cooling duct (see, for example, Fig. 1) of the utility model, wherein the cooling oil mass flow accumulated is at 10-20 liters/min By axial cooling duct in the range of clock (LPM), and wherein single cooling duct is located in each stator tooth, and motor Do not include water-cooling jacket；(ii) the round cooling duct 201 (referring to Fig. 2) in stator yoke 203, wherein accumulating cooling oil Mass flow is by round cooling duct in the range of 10-20LMPM, and each stator slot tool is there are three round cooling duct, and Wherein motor does not include water-cooling jacket；And (iii) surrounds the water-cooling jacket of stator according to the prior art.In this case, It is about 3100W to study the loss of electric machine.For the embodiment, the axial cooling duct of the utility model is by the peak value in Stacking for laminated plates Operating temperature reduces about 40 DEG C or more than cooling jacket configuration and reduces about 23 DEG C or more than the configuration of round cooling duct.This Realize that similar cooling improves relative to copper winding in the axial cooling duct of utility model.It should be appreciated that by reducing peak value temperature Degree, stator resistance decline, and lead to the reduction of stator copper loss.As a result, it is possible to reduce the amount of the copper used in winding, so as to save into This, without influencing whole motor performance.

In general, for specific application (for example, EV traction electric machines), motor (for example, size, output, duty ratio etc.) With cooling system (for example, cooling agent characteristic, heat exchanger characteristic etc.) for example using multiphysics simulation from electromagnetism, heat and structure Angle optimizes the size of axial cooling duct and positioning.The manufacturability of cooling duct is also contemplated, such as ensures that cooling is logical The size and shape in road be adapted for use in itself suitable manufacture tool (for example, for conventional tool, radius for 0.5mm or The tool of bigger).It should be appreciated that the axial cooling duct of the utility model can utilize it is any one of variously-shaped.It is excellent Selection of land, each tooth of stator includes all axial cooling ducts as disclosed herein, if so as to prevent cooling duct from only being tied Close the hot spot that then will appear in the subset of stator tooth.In addition, including the axial cooling duct in each stator tooth, with tooth Subset is on the contrary, simplify winding insertion process.

Fig. 3-7 shows common cooling duct shape according to the present utility model, each in these exemplary configurations It is a to be shown in a part for stator 301.In these figures, slot 303 has been optimized to that higher slot is allowed to fill.In addition, The bottom part 305 of each channel has been shaped as simplification and has included slit voussoir (not shown), such as those skilled in the art institute Well known, it is used for the appropriate location being maintained at winding in slot.It will be appreciated, however, that the utility model is not limited to specifically Channel shape or specific groove shape.For example, the shape of axial cooling duct can be generally elliptical (for example, shown in Fig. 3 logical Road 307), substantially rectangular shape (for example, channel 401 shown in Fig. 4) or generally triangular shape are (for example, Fig. 5 institutes The channel 501 shown).In addition, the corner of rectangle and triangle cooling duct can be rounded corner or not rounded corner, and such as Fruit rounded corner, then the radius of curvature of fillet can be optimised.Fig. 6 shows the rectangle axial direction cooling duct 601 with fillet, figure 7 show the triangular shaft with fillet to cooling duct 701.It should be appreciated that Fig. 5 and triangular shaft shown in Fig. 7 to cooling Channel can allow groove shape to be therefore particularly suitable for the hair fastener with rectangular shape for rectangle as depicted (that is, slot 503) Formula winding type (hairpin winding type).Regardless of cooling duct shape, it is preferable that each cooling duct is most The edge 607 that outer edge 603 will not extend outwardly beyond adjacent stator slot 303 (is surveyed from the cylindrical axis 615 of stator The direction 605 of amount) (referring to Fig. 6).The innermost edge 609 of each cooling duct is located in interior tooth edge 611 at a distance of enough At distance, to ensure the structural intergrity of tooth, and to keep sufficiently low magnetic saturation.Although other channels can be used Width, but in a preferred embodiment, the width 613 of each cooling duct is about 1 millimeter.

With the increase of mechanical load, the electric current in stator winding is caused to increase, motor heating.Electricity in stator winding Resistance loss P_WIt can be approximated to be：

P_W=(I_ph ²)(R_dc),

Wherein I_phIt is phase current, R_dcIt is DC current.R_dcDepending on the wire cross-section area that is used in winding and length with And electricalresistivityρ.Electricalresistivityρ depends on temperature T.If temperature T changes less greatly, linear approximation as follows can be used To determine resistivity.Specifically：

ρ (T)=ρ₀[1+α(T–T₀)],

Wherein α is the temperature coefficient of resistivity, T₀It is fixed reference temperature (be typically room temperature), ρ₀It is in temperature T₀'s Resistivity.Parameter alpha is the empirical parameter from measure data fitting.In copper, α 0.003862K^-1。

The core loss that steel laminate including stator module generates depends on material character and power inverter power supply Magnetic flux density and frequency.These losses and the mechanically and electrically loss of other motors can increase the heat of system, so as to cause The temperature raising of work drive motor.

Preferably, the saturation degree of the magnetic flux in tooth is maintained at optimum level so that the electromagnetic torque of motor maximizes.It should Target can be by optimizing to realize together slot 105 and axial cooling duct 101.It was found by the inventors that this optimization is logical The reduction of well width is often resulted in, leads to the reduction of copper and the increase of stator resistance.As follows, the increase of stator resistance can lead to Reduction temperature is crossed to overcome, this reduces resistance.

From the point of view of heat viewpoint, axial cooling duct be optimized to minimize the cooling agent wetting zones of cooling duct with it is every Thermal resistance between the coolant entrance part of a channel.For the heat of specified rate to be dissipated, relatively low thermal resistance leads to motor Interior temperature is relatively low.Thermal resistance R_thWith wetted area A and heat transfer coefficient α_htPass through below equation correlation：

R_th=1/ (A α_ht)。

The heat Q removed by single channel can be expressed as：

Q=(T_wall–T_inlet)/R_th,

Wherein T_wallAnd T_inletThe mean temperature of cooling agent wetting zones of channel and cooling duct inlet portion are represented respectively The average coolant temperature of office.The equation can be rewritten as：

Q=A α_ht·(T_wall–T_inlet)。

Therefore, reduce motor internal temperature is critical that A α_htValue maximizes, so as to minimize thermal resistance.Heat transfer system Number α_htValue depend on the interface that occurs in cooling agent, i.e. conduction and convection current.Conduction is by the thermal property of cooling agent, spy It is not the thermal conductivity generation of cooling agent.Assuming that flow through axial cooling duct cooling agent and Stacking for laminated plates and copper termination winding it is direct Contact, it is preferable that cooling agent is both non-conductive nor corrosive.In at least one embodiment of the utility model, use Machine oil or transmission oil with high dielectric strength are as cooling agent.

The convection mechanism of heat abstraction depends on the fluid motion fluidised form in axial cooling duct.Fluid motion in channel takes Certainly in reynolds number Re, represent the ratio between inertia force associated with flowing cooling agent and viscous force, be given by：

Re=(ρ ν D)/μ,

Wherein ρ is coolant density, and ν is the average coolant velocity measured on the cross section of channel, and D is that waterpower is straight Diameter, μ are cooling agent dynamic viscosities.For low reynolds number, usually less than 2300, cooling agent fluidised form is laminar flow, and main heat transfer mechanism is Conduction.For high reynolds number, typically larger than 4000, cooling agent fluidised form is turbulent flow.In this case, the fluctuation meeting in cooling agent Increase mixing, so as to generate additional heat transfer mechanism by convection current.For being more than 2300 and Reynolds number less than 4000, cooling agent Fluidised form is in transformation.

Hydraulic diameter D is defined as：

D=4 (A_sec/P_sec),

Wherein A_secIt is cross-sectional area, P_secIt is the wetted perimeter of cooling duct cross section.As previously mentioned, in order to reduce motor Temperature, it should improve A α to the maximum extent_htValue, preferably by maximizing cooling agent wetting areas A and dependent on fluid stream The heat transfer coefficient α of state_ht.The expression formula of heat transfer coefficient can easily use nusselt number Nu, Prandtl number Pr and passage length L with Ratio between hydraulic diameter D represents.Usually they use Dimensionless Form：

Nu=F (Pr, Re, L/D ...).

Nusselt number and Prandtl number are defined as：

Nu=α_ht(D/k) and

Pr=Cp (μ/k),

Wherein Cp is the specific heat of cooling fluid, and k is the thermal conductivity of cooling fluid, and μ is the dynamic viscosity of cooling fluid.

Therefore, from above it will be clear that influencing axial cooling due to acting on particular motor there are many factor The specific design of channel；These factors include cooling agent wetting areas A, heat transfer coefficient, α_ht, the topology and size and matter of channel Measure flow.Therefore, research is optimized, so as to from electromagnetism, the angle of heat and structure optimizes axial flow of fluid cooling duct Design.Should research shows that, the axial cooling duct of the utility model in the stator tooth is relative to positioned at stator as described above Yoke in axial cooling duct provide significant electromagnetism, heat and mechanical advantage.For example, the axial direction being located in stator tooth is cold But channel due to it unique position in tooth, flux is parallel to as unidirectional stator slot, so will not be the magnetic flux in stator Amount generates additional higher hamonic wave.As a result, thin long axial cooling duct in stator tooth is to be similar to the side of stator slot Formula works, and magnetic flux (flux) is directed in air gap and rotor.On the contrary, axial passage is positioned in stator yoke, including " root " of stator tooth, wherein flux are non-unidirectional, may interfere with flux and generate the higher hamonic wave for forming excess loss.

In addition, optimizing research determines that (such as the axial cooling between each pair of stator slot is logical by using many passage aisles Road) rather than obtain best many-sided tradeoff between electromagnetic performance and hot property with the less channel of larger cross section (multi-disciplinary trade-off).This leads to the small hydraulic diameter of channel, and accordingly, it is considered to preferred cooling The characteristic of agent (for example, lubricating oil) and the usable range of mass flow, lead to low reynolds number.This means that for passing through lubrication The mass flow value of oil cooling but motor not satisfactory (plausible) is (for example, by all logical in the range of 10-20LMP The cumulative flow rate in road), flowing fluidised form in axial cooling duct always laminar flow.It is logical that Fig. 8 illustrates two kinds of axial cooling Relationship between the Reynolds number and flow velocity in road.Curve 801 represents the oval cooling duct being located in stator tooth (see Fig. 1) Reynolds number data, and curve 803 represents the Reynolds number data for the circular channel (see Fig. 2) being located in stator yoke.

It is well known that laminar fluid fluidised form needs a certain of channel longitudinal direction before it can form its VELOCITY DISTRIBUTION completely Partial-length.In general, the heat transfer that the heat transfer coefficient realized in " entrance area " is realized after being formed completely higher than fluid flow state Coefficient.Therefore, longer channel usually provides relatively low mean heat transfer coefficient.In addition, when the cross section of channel is not circle, Local heat transfer coefficient changes around periphery, in its corner portion close to zero.Therefore, it is imitated to optimize the integral energy of cooling system Rate, it is necessary to the pressure drop of cooling on a passage is considered, because required pressure drop is higher, it is necessary to provide more energy to pump cooling Agent.In general, cooling duct is designed with sufficiently large pressure drop, uniform cooling agent to be promoted to flow through all channels.For example, at least In one preferred embodiment, by the pressure drop of cooling duct in the range of 2-30kPa.In addition, cooling duct is preferably designed It is minimized into the pressure drop made at entry position, so as to maximize the efficiency of cooling agent pumping circuit.In an exemplary implementation In example, flow is adjusted so that increased in the range of 5 DEG C to 20 DEG C by the coolant temperature of motor cooling duct.

From the perspective of structure, stator laminate and cooling duct must be designed to bear to act on stator laminate tooth On, particularly act on the torque in tooth tip.In this respect, cooling duct is placed on to the centre of the cross section of stator tooth It is confirmed as not weakening the structural intergrity of tooth, this is because the central axes pair of the carrying section of the position and tooth of axial cooling duct It is accurate.Axial cooling duct with rounded corner be it is preferred, so as to reduce the mechanical stress of stator laminate (for example, with reference to Fig. 6 and 7).From the perspective of cooling, due to cooling agent (for example, oil) leaving channel and directly impact on End winding, so this The axial cooling duct of utility model provides the additional benefits for improving the cooling to Stator End Winding.

By the performance of the cooling duct with circular cross section in stator yoke with being located in stator tooth with oval horizontal The optimizing research being compared of the performance of the cooling duct in section is it has been shown that although the former mean heat transfer coefficient and average The equal higher of nusselt number (see Fig. 9 and Figure 10), however the configuration of the latter is preferred.The cooling agent being preferably placed in stator tooth leads to Road is because always more effective in terms of temperature of the configuration in removal heat and reduction motor, particularly including laminate and copper In the stator component of winding.This is the result is that since the coolant channel of (i) in tooth is placed colder in yoke than being located at But agent channel is closer to the relatively low thermal resistance of the oval-shaped passageway in stator copper bar and (ii) tooth.Oval-shaped passageway it is relatively low Thermal resistance be larger available wetting areas compared with the circular channel in yoke result.Axial direction between stator slot The additional advantage that cooling duct provides is that the pressure drop of each channel under identical mass velocity, which is less than, to be located in stator yoke The pressure drop of circular channel (see Figure 11).Therefore, the required energy of pumping coolant is less, so as to generate more energy efficient cooling system System.From the viewpoint of manufacture, the number of channels needed for channel in stator tooth is always configured less than circular yoke channel Required port number, so as to simplify system manufacture.

Based on optimizing research, the preferred embodiment of the utility model, which utilizes, to be arranged in stator tooth (i.e. between stator slot) Axial cooling duct.Although being not required, it is preferable that single axial direction cooling duct is fabricated onto in each stator tooth (for example, see Fig. 6).In addition, in order to realize best heat abstraction, preferably by cooling agent (for example, noncorrosive non-conductive Oil) it is fed into the center of Stacking for laminated plates rather than is fed into one end of stacking.Be fed into the center of stacking allow it is shorter cold But channel, that is, the left side stacked and right part rather than entire stacking is extended through, so as to provide higher average heat transfer system Number and improved cooling.In addition, being fed into stacking center allows to cool down stacking captured in heat and that hot spot usually occurs Centre starts.

Figure 12 provides the simplification viewgraph of cross-section of the motor using cooling system as described herein.It is as shown in the figure, cold But agent 1201 is pumped into center or the general center of the Stacking for laminated plates including stator 1203.Cooling agent leads to via axial cooling agent It flows at the both ends 1205/1206 that road 1207 is outwardly directed to stator from center.As cooling agent leaves stator, it is passing through motor casing It directly flows through End winding 1209 before body 1211 and is collected in cooling agent disk 1213.Passing through heat exchanger 1215 Later, preferably after by filter 1217, coolant pump is returned into stator using pump 1219.

Figure 13 provides the perspective view of a part 1300 for Stacking for laminated plates, such as the laminate of the stator 1203 including Figure 12 It stacks.It should be appreciated that in the simplification view, each laminate for forming Stacking for laminated plates is not separately visible.In addition, in the figure In stator winding is not shown, therefore can obtain single stator tooth 1301 and the cooling duct 1303 being attached in each tooth Better view.It should be appreciated that other than axial cooling duct as described herein, the design and manufacture of stator be it is well known, Therefore detailed description will not provided.In general, stator is made of a stack of plate, commonly referred to as laminate, wherein each plate and phase Adjacent plate electrical isolation.Plate usually with single piece of material (such as steel) punching press or is otherwise fabricated to.In order to realize electrical isolation, each Two surfaces of plate are coated with electric insulation layer.Electric insulation coating layer can coat before or after the manufacture of plate, such as rush Before or after pressure.Since each plate includes one or more layers electrically insulating material, so after coating, plate is commonly known as layer Pressing plate or laminate, and sheetpile folds commonly known as Stacking for laminated plates.After stack assembly, winding is arranged around stator tooth.

It is cooling agent discrimination to be attached in stator and between the left half 1305 of Stacking for laminated plates and right half 1307 Pipe 1309.Coolant manifold 1309 is connected to the coolant entrance 1221 shown in Figure 12.Cooling agent pumping passes through entrance 1221 simultaneously Into manifold 1309, manifold is then by coolant distribution to all axial cooling ducts 1303.Manifold 1309 is connected and is sealed To entrance 1221 so that the entire periphery of manifold 1309 is flowed through in pumping by the cooling agent of entrance 1221.By by inlet seal To manifold, cooling agent is forced through manifold into all axial cooling ducts.This aspect of the utility model in Figure 14 and It is shown in simplification cross-sectional view shown in 15.Figure 14 and 15 shows manifold 1401, and it is logical that manifold 1401 includes multiple axial coolings Road 1403 and multiple slots 1405.Each cooling duct 1403 is fluidly connected to the periphery of manifold via coolant channel 1407 Side.Due to sealing element 1409, the cooling agent into entrance 1411 is flowed along flow path 1413 around the periphery of manifold 1401 It is dynamic.Then coolant flow supercooling agent channel 1407 and the axial cooling duct 1403 of entrance.If desired, and such as Figure 15 institutes Show, multiple coolant entrances 1501 can be bound to component, so as to peomote the circumferential distribution that cooling agent surrounds manifold 1401. In the view provided in fig.15, manifold 1401 is connected to three coolant entrances 1501, but it is to be understood that component can make With the entrance of less or more quantity.

Figure 16 and 17 provides the perspective view of the part of two different embodiments of coolant distribution manifold.Shown in Figure 16 Manifold 1600 and Figure 17 shown in manifold 1700 in it can be seen that, it is multiple to be formed integral in corresponding stator tooth 1603 Axial cooling duct 1601 and multiple slots 1605.In manifold 1600, multiple holes 1607, also referred to as port are located at 1609 periphery of periphery of manifold allows cooling agent to enter manifold and arrived by cooling agent interface channel 1611 shown in dotted line Axial cooling duct 1601.In manifold 1700, multiple slots 1701, which provide, allows cooling agent to flow into axial cooling duct 1601 Channel.Casting technique manufacture is preferably used in manifold 1600, however can also use other manufacturing technologies (for example, punching press). In at least one embodiment, the material of manufacture manifold 1600 is aluminium, and in the second preferred embodiments, manufacture the material of manifold 1600 Material is soft magnetic composite material (that is, SMC).Manifold 1600 can also be made (for example, steel, plastics) of other materials.SMC is Preferably as they provide various desired characteristics, including Three-Dimensional Isotropic ferromagnetic property, low vortex flow loss and middle height Low total core loss under frequency.In addition, SMC can be designed as providing the thermal characteristics of enhancing, overall weight and the discrimination simplified are reduced Pipe manufactures.Sheet Metal Forming Technology manufacture and the front layer and back layer including non-conductive coating layer is preferably used in manifold 1700.Cooling agent point It is fabricated in manifold 1700 with channel 1701, wherein channel 1701 manufactures preferably in the form of radial slot, the radial slot The periphery of manifold is fluidly connected to cooling duct, as shown in the figure.It should be appreciated that other designs and other manufacturing technologies can be with For manifold, which is assigned to cooling agent (such as oil) the axial cooling duct manufactured in stator tooth.

Figure 18-25 is shown with reference to the preferred of inexpensive manufacturability and the cooling advantage of the utility model as described above Design configurations.Figure 18 provides the decomposition view of stator module 1800.Such as previous in figure, in figure in Figure 18 or thereafter not Stator winding is shown, in order to provide stator tooth and the clearer view of axial cooling duct.In figure 18, stator stack the One end 1801 is separated by coolant manifold component 1805 and the second end 1803 of the stacking.Although it cannot understand in figure Ground is shown, however each part 1801/1803 of stator module is made of a stacking plate (i.e. laminate), wherein every block of plate with it is adjacent Plate electrical isolation.Preferably, each laminate including part 1801 and 1803 is by single piece of material (for example, steel) punching press or with other sides Formula manufactures.In order to realize electrical isolation, two surfaces of each plate are coated with electric insulation layer, floating coat before lamination manufactures or It is after-applied.

Coolant manifold component 1805 includes the first manifold 1807 and the second manifold 1809.Each manifold 1807 and 1809 can To be made of lamina or multi-layer board.In this embodiment, the first and second coolant manifolds are each about 5 millimeters thicks, so as to Form the manifold component of about 10 millimeters thicks.Preferably, laminate including coolant manifold 1807 and 1809 by with including stator department The identical material (such as steel) used in 1801 and 1803 laminate is divided to be made.Coolant manifold laminate and others are determined Sublayer plate has several advantages using the same or similar material, particularly in the case where selected material is steel.First, may be used To use identical manufacturing process, preferably punching press, to manufacture all laminates, so as to shorten manufacturing time and cost is reduced.Make It is avoided with punching press or similar technique manufacturing manifold component and (such as drills with many other manifold manufacturing technologies, mould, beat Slot, milling etc.) associated relatively high cost.Secondly, material is generally reduced using identical material for all laminates Expect cost, cost can be saved significantly on when considering and manufacturing a large amount of motors.Third as shown in figure 19, can use what is such as welded Simple process forms single, combined structure from part 1801/1803 and coolant manifold component 1805.It is illustrating Structure in, the slot 1811 around the periphery of laminate arrangement is for being directed at and weld arrangement.4th, it is led by using such as steel is contour Hot material forms manifold component, and heat dissipation is improved.5th, even if the magnetic characteristic of manifold component differs, also with including Part 1801 is similar with those relevant magnetic characteristics of 1803 laminate.

Figure 20 provides the enlarged perspective of the part of manifold 1807 and 1809；Figure 21 offers are intercepted from end 1803 The end-view (end-view of manifold 1809 that optionally, Figure 21 offers are intercepted from end 1801) of manifold 1807；Figure 22 is provided The perspective view of manifold component 1805, wherein manifold 1807 and 1809 are properly located relative to each other before final assembling；Figure 23 provide the enlarged view of a part for the manifold component shown in Figure 22.Figure 24 provides a part for coolant manifold component Simplification viewgraph of cross-section；And Figure 25 provides a part for stator together with the axial cooling duct shown in Figure 18-23 Enlarged perspective.In a preferred embodiment, as shown in Figure 18-25, coolant manifold part 1807 and 1809 is mutually the same.In order to Realize desired coolant flowpaths, during assembly, a coolant manifold " is turned over relative to another coolant manifold Turn " or " reversings " (that is, a coolant manifold is reversed so that the front surface of a coolant manifold be the second cooling agent discrimination The rear surface of pipe).By inverting a coolant manifold before alignment and assembling, via a 2201 (example of manifold port Such as, port 2201A) into manifold component cooling agent by via different manifold ports 2201 (for example, port 2201B) from Manifold component is discharged.As depicted in figures 22 and 23, after manifold alignment, coolant hole 2201 in each manifold is manufactured each other Offset.The hole deviates so that the cooling agent into a manifold port 2201 (for example, port 2201A) is passing through another manifold Snakelike by hole 2101, the hole in hole 2101 and another manifold specially in a manifold before port 2201 is discharged Between 2101 alternately (such as port 2201B).Figure 24 provides a part for the coolant manifold component 1805 by hole 2101 Simplification viewgraph of cross-section, which schematically shows the serpentine pattern 2401 of cooling agent.

Manifold hole 2101 is used for two purposes.First and as noted previously, as manifold is deviateed in the hole 2101 of manifold 1807 1809 hole 2101, so after coolant manifold component is entered by port 2201, cooling agent is by promotion wind through hole. Secondly, coolant channel 2103 is fluidly connected to each hole 2101, allows cooling agent from orifice flow in stationary part The axial cooling duct manufactured in 1801 and 1803.Therefore, when a part of cooling agent flows through hole with serpentine pattern, cooling agent Second part flows through coolant channel 2103, and flows through axial cooling duct, Yi Jiliu before being discharged from the both ends of stator Through End winding, as shown in figure 12.Such as previous in embodiment, by the way that manifold is located at or near the center of stator, Cooling agent is pumped into the both ends of stator module from stator center outward.In addition, pass through the coolant channel being aligned as shown in the figure 2103, cooling agent is assigned to two ends 1801 and 1803 of stator simultaneously.

Although cooling manifold 1805 can be used together, such as with any one of multiple axial cooling ducts as above Described and/or axial cooling duct as shown in fig. 3 to 7, however, it is preferred that the axis shown in manifold 1805 and Figure 18,19 and 25 It is used together to cooling duct.In the configuration, a pair of axial cooling duct 2503 and 2505 is related to each stator tooth 2501 Connection.Each axial direction cooling duct 2503 is centrally located in corresponding stator tooth 2501, and adjacent stator slot 2507 it Between be equally spaced.In cross-section, each axial cooling duct 2503 is thin and long, it is therefore preferred to have about 1 millimeter Width.The innermost edge 2509 of each cooling duct 2503 is located at corresponding interior tooth edge 2511 at enough distances, To keep sufficiently low magnetic saturation, while ensure the structural intergrity of tooth.Each cooling duct 2503 is from the cylindrical shaft of stator Line extends outwardly away from so that outermost channel edge 2513 is located near the midpoint of corresponding stator tooth.By using being significantly less than The cooling duct length of stator tine length can make 2515 bigger of width of slot, so as to provide more spaces for stator winding.

Due to the limited length of axial cooling duct 2503, it has been found by the present inventors that preferably including second group of axial direction Cooling duct 2505, to further improve the cooling capacity of system.In such an embodiment, it is preferred to the axis less than channel 2503 It is extended at least partly into stator yoke 2517 to cooling duct 2505.By make channel 2505 size and they prolong The degree for reaching yoke minimizes, their influences to the magnetic flux in stator can minimize.Preferably, axial cooling duct 2503 and 2505 are aligned jointly so that single flute profile coolant channel 2103 is fluidly connected to two as depicted and leads to Road.

Briefly system and method have been described to help to understand the details of the utility model.In some cases Under, the aspect of well known structure, material and/or operation to avoid fuzzy the utility model is not shown or described in detail.At other In the case of, detail is had been presented for provide the thorough understanding to the utility model.Those skilled in the relevant art will recognize Know, the utility model can embody in other specific forms, such as be fitted in the case of without departing from its spirit or essential attributes Answer specific system or device or situation or material or component.Therefore, disclosures and descriptions herein is intended to illustrate and not limit The scope of the utility model.

Claims

1. a kind of electromotor cooling system, it is characterised in that including：

Multiple axial cooling ducts in the multiple stator tooth are integrally formed in, wherein with the multiple axial cooling duct Each corresponding axis with corresponding to the stator cylinder axis it is parallel；With

The coolant manifold component being integrally formed in the stator, the coolant manifold component include the first coolant manifold With the second coolant manifold, first coolant manifold includes more than first a holes and more than first a coolant channels, wherein institute It states a coolant channel more than first and more than described first a holes is fluidly connected to the multiple axial cooling duct, described second Coolant manifold includes more than second a holes and more than second a coolant channels, wherein a coolant channel is by described in more than described second A hole more than second is fluidly connected to the multiple axial cooling duct, a hole more than described first and more than described second a hole fluids Connection so that the first part that the cooling agent of the coolant manifold component is flowed by the first manifold port is passing through the second discrimination Pipe port is snakelike logical between hole a more than described first and more than second a hole before coolant manifold component discharge It crosses, and is passing through via the second part of the cooling agent of first manifold port inflow coolant manifold component A coolant channel more than described first and second enters before the multiple axial cooling duct, flows through more than described first and second A hole.

2. electromotor cooling system according to claim 1, it is characterised in that first coolant manifold and described second Coolant manifold is identical, and wherein described second coolant manifold is opposite before being assembled in the coolant manifold component It is reversed in first coolant manifold.

3. electromotor cooling system according to claim 1, it is characterised in that in the coolant manifold component, described A coolant channel more than one is aligned with more than described second a coolant channels, and wherein in the coolant manifold component, A hole more than described first is deviated relative to more than described second a holes.

4. electromotor cooling system according to claim 1, it is characterised in that first coolant manifold is by least first Punching press laminate is formed, and wherein described second coolant manifold is made of at least the second punching press laminate.

5. electromotor cooling system according to claim 1, it is characterised in that first and second coolant manifold respectively by Steel is formed.

6. electromotor cooling system according to claim 5, it is characterised in that first and second coolant manifold respectively applies It is covered with electrical insulation material layer.

7. electromotor cooling system according to claim 1, it is characterised in that more than second axial direction cooling duct is further included, Described at least part of each in more than second axial cooling ducts be formed integral in the yoke of the stator, In with each corresponding second axis and the cylinder axis of the stator in more than described second axial cooling ducts It is parallel, wherein a coolant channel more than described first more than described first a holes are fluidly connected to more than described second it is axial cold But channel, wherein more than described second a holes are fluidly connected to more than described second axially by a coolant channel more than described second Cooling duct, and the second part of the inflow coolant manifold component of the cooling agent is passing through first He A coolant channel more than second is flowed into before described more than second axial cooling ducts, flows through a hole more than described first and second.

8. a kind of electromotor cooling system, it is characterised in that including：

Multiple axial cooling ducts in the multiple stator tooth are integrally formed in, wherein with the multiple axial cooling duct Each corresponding axis with corresponding to the stator cylinder axis it is parallel；

The coolant manifold being integrally formed in the stator, the coolant manifold include multiple coolant channels, wherein institute It states multiple coolant channels and the multiple axial cooling duct is fluidly connected at least one motor coolant entrance；With

Coolant pump, wherein the coolant pump circulates the coolant through at least one motor coolant entrance, described Coolant manifold and the multiple axial cooling duct.

9. electromotor cooling system according to claim 8, it is characterised in that the coolant manifold is further included around described Multiple coolant ports of the periphery arrangement of coolant manifold, the multiple coolant ports are led to corresponding to the multiple cooling agent Road.

10. electromotor cooling system according to claim 8, it is characterised in that the coolant manifold by aluminium, steel, plastics or Soft magnetic composite material is made.

11. electromotor cooling system according to claim 8, it is characterised in that the coolant manifold is to use casting technique Manufacture.

12. electromotor cooling system according to claim 8, it is characterised in that the multiple coolant channel includes multiple diameters To slot, wherein the multiple radial slot fluidly connects on the periphery of the coolant manifold and the multiple axial cooling duct It connects.

13. electromotor cooling system according to claim 8, it is characterised in that the coolant manifold is to use Sheet Metal Forming Technology Manufacture.

14. electromotor cooling system according to claim 8, it is characterised in that the coolant pump recycles the cooling agent Pass through at least one motor coolant entrance, the coolant manifold, the multiple axial direction cooling duct and heat exchanger.

15. electromotor cooling system according to claim 8, it is characterised in that the cooling agent includes oil, wherein the oil It is noncorrosive and non-conductive.

16. the electromotor cooling system according to claim 1 or 8, it is characterised in that in the multiple axial direction cooling duct The first end of each terminates at stator first end face, and the of each in wherein the multiple axial cooling duct Two end runs terminate at stator second end face, wherein the stator first end face is far from the stator second end face.

17. electromotor cooling system according to claim 16, it is characterised in that flow through in the multiple axial cooling duct The cooling agent of the first end of each directly flow through a End winding more than first, and wherein flow through the multiple axis A End winding more than second is directly flowed through to the cooling agent of the second end of each of cooling duct.

18. the electromotor cooling system according to claim 1 or 8, it is characterised in that the list of the multiple axial direction cooling duct A axial direction cooling duct is formed integral in each of the multiple stator tooth.

19. the electromotor cooling system according to claim 1 or 8, it is characterised in that in the multiple axial direction cooling duct A pair of of axial direction cooling duct is formed integral in each of the multiple stator tooth.

20. electromotor cooling system according to claim 19, it is characterised in that it is the multiple axial direction cooling duct it is described First axis cooling duct in a pair of of axial direction cooling duct is fully unitary to be formed in each the multiple stator tooth, and wherein The second axial cooling duct in the pair of axial cooling duct of the multiple axial direction cooling duct is whole at least partly It is formed in the yoke of the stator.

21. electromotor cooling system according to claim 19, it is characterised in that the institute in the multiple axial direction cooling duct The first axis cooling duct for stating a pair of axial cooling duct fully unitary is formed in each the multiple stator tooth, and wherein Axial cooling duct is fully unitary is formed in institute for the second of the pair of axial cooling duct of the multiple axial direction cooling duct It states in the yoke of stator.

22. the electromotor cooling system according to claim 1 or 8, it is characterised in that in the multiple axial direction cooling duct Each is with rectangular cross section.

23. electromotor cooling system according to claim 22, it is characterised in that the rectangular cross section has fillet.

24. the electromotor cooling system according to claim 1 or 8, it is characterised in that in the multiple axial direction cooling duct Each is with oval cross section.

25. the electromotor cooling system according to claim 1 or 8, it is characterised in that in the multiple axial direction cooling duct Each cross section with triangle.

26. electromotor cooling system according to claim 25, it is characterised in that the triangular cross section has fillet.

27. the electromotor cooling system according to claim 1 or 8, it is characterised in that from the cylinder axis to the multiple The first radial distance that the outermost edge of each in axial cooling duct measures is less than from the cylinder axis to described more The second radial distance that the outermost edge of each in a slot measures.

28. the electromotor cooling system according to claim 1 or 8, it is characterised in that from the cylinder axis to the multiple The first radial distance that the outermost edge of each in axial cooling duct measures is equal to from the cylinder axis to described more The second radial distance that the outermost edge of each in a slot measures.

29. the electromotor cooling system according to claim 1 or 8, it is characterised in that in the multiple axial direction cooling duct Each has the width of 1 millimeter or bigger.

30. the electromotor cooling system according to claim 1 or 8, it is characterised in that the stator is divided into the first stator department Point and the second stationary part, and wherein described coolant manifold first stationary part and second stator department point it Between be formed integral in the stator.

31. electromotor cooling system according to claim 30, it is characterised in that first stationary part, described second are determined Subdivision and the coolant manifold are welded together to form single structure.