WO2011052741A1 - Pump and pump drive device - Google Patents

Abstract

A pump is provided with a pump section which is provided with an impeller for sucking and discharging liquid, a motor section which drives the pump section, and a casing which contains the pump section and the motor section and has formed therein a suction opening and a discharge opening for the liquid. The motor section is provided with a stator which has coils and a rotor which is rotated by the stator. A mounting section for mounting the stator to the casing is provided to the stator. A defining section for defining the position of the mounting section relative to the casing is provided to the casing. As a result of the configuration, a variation in the performance of the pump is minimized.

Description

Pumps and pump drive equipment

The present invention relates to a pump and a pump driving device.

The following Patent Document 1 discloses a conventional pump. The pump includes a pump unit having an impeller that sucks and discharges liquid, a motor unit that has a rotor and a stator and drives the pump unit, and a casing that houses the pump unit and the motor unit.

This pump improves the pump performance by fixing the stator to the casing by fastening the mounting portion provided on the side of the stator to the casing with a screw or the like.

Japanese Unexamined Patent Publication No. 2009-177984

However, in the above pump, there is a case where the pump performance varies due to the displacement of the stator when the stator is fixed to the casing.

Therefore, an object of the present invention is to provide a pump capable of suppressing variations in pump performance and a pump driving device including the pump.

A first feature of the present invention is that a pump unit having an impeller for sucking and discharging liquid, a motor unit for driving the pump unit, the pump unit and the motor unit are accommodated, and a liquid suction port and a discharge port are provided. And a casing formed with a pump. The motor unit includes a stator having a coil and a rotor rotated by the stator. A mounting portion for attaching the stator to the casing is provided in the stator. A defining portion that defines the position of the mounting portion with respect to the casing is provided in the casing.

According to the first feature, since the defining portion that defines the position of the mounting portion with respect to the casing is provided, the displacement of the stator when the stator is fixed to the casing can be suppressed. As a result, variations in pump performance can be suppressed.

Here, it is preferable that the defining portion and the mounting portion are fitted to each other.

According to this configuration, the stator can be fixed to the casing and the stator can be positioned relative to the casing at the same time. For this reason, it is not necessary to perform attachment and positioning at different locations, and space can be saved. Also, the assembly workability of the pump can be improved.

Further, it is preferable that the attachment portion is a plurality of protrusions provided on the side portion of the stator.

According to this configuration, the stator can be stably attached to the casing.

Furthermore, it is preferable that the defining portion is a plurality of concave portions in the casing.

According to such a configuration, the projecting portion (attachment portion) can be easily fitted into the recessed portion (regulating portion).

Furthermore, it is preferable that the recess is formed by a mounting surface of the mounting portion and a pair of ribs protruding from the mounting surface.

According to this configuration, since the defining portion can be formed as a recess by providing the pair of ribs, the structure of the attachment portion of the stator to the casing can be simplified. As a result, the pump can be easily manufactured. Further, the stator can be accurately positioned through the mounting portion by the mounting surface.

Furthermore, it is preferable that the rib is provided with a tapered portion that extends the inner width of the concave portion toward the tip.

According to this configuration, by providing the rib with a tapered portion that becomes wider toward the tip, the mounting portion can be easily inserted into the defining portion, so that the mounting portion can be easily fitted into the defining portion. Become.

Further, it is preferable that the defining portion and the attachment portion are fixed by a fastening member.

According to this configuration, the displacement of the stator can be suppressed, and the pump performance can be further improved.

The second feature of the present invention is a pump driving device equipped with the above-described pump.

According to the second feature, a pump drive device with little variation in pump performance can be provided.

FIG. 10 is a cross-sectional view of the pump according to the embodiment (a cross-sectional view taken along the line II in FIG. 9). It is a disassembled perspective view which shows the stator core and insulator of a pump. It is a perspective view of the subassembly of a stator core and an insulator. It is a top view which shows the positional relationship of a stator core and a sensor. It is an expansion perspective view inside the casing which shows the state before attachment to the casing of a stator. It is an expansion perspective view inside the casing which shows the attachment state to the casing of a stator. It is sectional drawing which shows the fitting state of a prescription | regulation part and an attaching part. It is an expansion perspective view inside a casing which shows the attachment state to the casing of a control board. It is a top view which shows the attachment state to the casing of a control board. It is a schematic diagram which shows the structure of the hybrid vehicle using the said pump.

Hereinafter, embodiments will be described in detail with reference to the drawings. In this embodiment, a motor-integrated pump is employed as the pump.

The motor-integrated pump 1 of the present embodiment includes a pump section [pump section] 2, a motor section [motor section] 3, and a casing 6, as shown in FIG. The pump unit 2 has an impeller 23 that sucks and discharges liquid. The motor unit 3 drives the pump unit 2. The pump unit 2 and the motor unit 3 are accommodated in a casing 6. The casing 6 is formed with a liquid suction port 22a and a discharge port 22b.

The motor unit 3 includes a stator 4 having a winding [coil] 44 and a rotor 5 rotated by the stator 4.

The casing 6 includes a pump casing (casing) 21 that forms an outline of the pump section 2 and a motor housing (casing) 31 that forms an outline of the motor section 3. The casing 6 is configured by integrally assembling a pump casing 21 and a motor housing 31.

In the pump chamber 22 of the pump casing 21, an impeller 23 constituting a centrifugal pump is rotatably accommodated. Further, as shown in FIG. 1, a suction pipe 21b in which a suction port 22a is formed is provided at the center of the pump casing 21. As shown in FIG. 9, the peripheral wall of the pump casing 21 is provided with a discharge pipe 21 c extending in a tangential direction and having a discharge port 22 b. According to the above configuration, when the impeller 23 is rotated by the motor unit 3, the fluid sucked from the suction port 22 a is discharged from the discharge port 22 b through the pump chamber 22.

The motor housing 31 includes a drum-shaped outer wall 31a, an inner wall 31b, and a cylindrical center wall 31c. The inner wall 31b is provided concentrically with the outer wall 31a inside the outer wall 31a with a predetermined interval between the inner wall 31b and the outer wall 31a. The center wall 31c is provided further inside the inner wall 31b, and fixes the support shaft 32. The ends of the outer side wall 31a and the inner side wall 31b on the pump part 2 side are connected by an annular end wall 31d. Moreover, the edge part on the opposite side to the pump part 2 of the inner wall 31b and the center wall 31c is connected by the annular | circular shaped bottom wall 31e. Furthermore, a partition wall 31f is provided inside the center wall 31c.

A step 31g is provided at the end of the outer wall 31a on the pump part 2 side. The pump casing 21 and the motor housing 31 are integrated by fixing the front end portion 21a of the pump casing 21 to the step 31g. The tip 21a is fixed to the step 31g by screwing through a packing (not shown) or welding, and at the same time, sealing is performed.

A stator accommodating chamber 33 is formed between the outer wall 31a and the inner wall 31b. The stator 4 of the motor unit 3 is fitted in the stator accommodating chamber 33. On the other hand, a rotor accommodating chamber 34 is formed between the inner wall 31b and the center wall 31c. The rotor accommodating chamber 34 accommodates the rotor 5 of the motor unit 3.

The bottom end (right side in FIG. 1) of the motor housing 31 is opened, but is closed by the bottom wall 35.

As shown in FIG. 2, the stator 4 includes a stator core 41, insulators 42A and 42B, and a winding 44 (see FIG. 1). On the inner periphery of the stator core 41, a plurality of tooth portions [teeth] 41a are projected at equal intervals in the circumferential direction. The insulators 42A and 42B are respectively attached to both ends of the stator core 41 in the axial direction (vertical direction in FIG. 2). Insulators 42A and 42B are provided with a plurality of covering portions [covers] 43 that insulate the outside of the tooth portion 41a at equal intervals in the circumferential direction. The windings 44 are respectively wound around the tooth portions 41a insulated by the covering portion 43, and generate magnetic force in the tooth portions 41a by energization.

1 and 2, the stator core 41 is configured by laminating a plurality of steel plates punched into a predetermined shape so as to form a tooth portion 41a.

As shown in FIG. 2, an arc portion [arch part] 41b is formed at the tip of each tooth portion 41a along the outer surface of the inner wall 31b. The tooth part 41a and the arc part 41b have a substantially T-shape when viewed from the axial direction.

The stator core 41 is fitted to the inner wall 31b by inserting the cylindrical inner wall 31b through the insertion holes formed in the plurality of arc portions 41b. As a result, the stator 4 and the rotor 5 are disposed to face each other. At this time, since the stator core 41 and the inner wall 31b are fitted, the displacement of the stator core 41 in the radial direction is suppressed. Further, when the stator core 41 and the inner wall 31b are fitted to each other, the central axis C (see FIG. 4) of the stator core 41 and the central axis of the inner wall 31b (the rotation axis of the rotor 5) coincide with each other. As described above, by causing the rotation axis of the rotor 5 accommodated in the rotor accommodating chamber 34 to coincide with the central axis C, variation in the distance between the tooth portion 41a and the rotor 5 is suppressed.

Further, as shown in FIG. 2, a mounting portion 41 c protrudes outward from one end of the stator core (stator) 41 in the axial direction. Two (plural) attachment portions 41c are provided on the stator core 41 side. The attachment portion 41c extends in the horizontal direction (a direction orthogonal to the central axis). Each attachment portion 41c is formed in a substantially semicircular shape when viewed from the axial direction, and a screw hole 41d is formed at the center thereof.

As shown in FIG. 1, a screw (fastening member) 45 is inserted into the screw hole 41d, and the screw 45 is screwed into a screw hole 31o (see FIG. 5) formed in the mounting surface 31h described later. The mounting portion 41 c is fastened to the outer wall 31 a of the motor housing 31. In this way, the stator core 41 is fixed to the motor housing 31.

Furthermore, the outer wall (casing) 31a of the motor housing 31 is provided with a defining portion 31k (see FIG. 5) that defines the position of the mounting portion 41c with respect to the outer wall (casing) 31a. The movement of the mounting portion 41c in the circumferential direction with respect to the outer wall (casing) 31a is restricted by the position of the mounting portion 41c defined by the defining portion 31k.

As shown in FIG. 5, the defining portion 31k includes a placement surface 31h and two ribs 31i. The mounting portion 41c is placed on the placement surface 31h so as to come into surface contact. The rib 31i protrudes from the mounting surface 31h toward the opening (upper side in FIG. 5) of the motor housing 31. The defining portion 31k is provided as a recess by the two ribs 31i and the mounting surface 31h formed between the ribs 31i. In addition, you may form a prescription | regulation part by providing a recessed part in a plane (plane in which the mounting surface 31h is formed).

Further, as shown in FIG. 7, the rib 31i is provided with a tapered portion 31l that becomes wider toward the tip (opening of the motor housing 31).

Specifically, the inner surface of the rib 31i is composed of an inclined surface 31m and a vertical surface 31n. The inclined surface 31m is located on the opening side (upper side in FIG. 7) of the motor housing 31, and the vertical surface 31n is located on the placement surface 31h side (lower side in FIG. 7) of the inclined surface 31m. Therefore, the rib 31i has a right trapezoidal cross section. The inner width of the two vertical surfaces 31n is substantially equal to the width of the mounting portion 41c (the distance between the side surfaces 41e). In addition, the width between the two inclined surfaces 31m is gradually increased toward the opening side. Thus, the taper part 31l is formed only on the opening side of the motor housing 31 of the rib 31i.

The mounting portion 41c and the defining portion 31k are formed so that the screw hole 31o and the screw hole 41d are overlapped with each other when the mounting portion 41c and the defining portion 31k are fitted. The defining portion 31k and the mounting portion 41c are fixed by screwing a screw (fastening member) 45 into the screw hole 31o and the screw hole 41d.

At this time, since the attachment portion 41c is positioned by the two ribs 31i, movement of the attachment portion 41c in the circumferential direction with respect to the outer wall (casing) 31a when the screw (fastening member) 45 is screwed is suppressed. Moreover, since the attaching part 41c is mounted on the mounting surface 31h, the stator 4 is positioned in the height direction (center axis C direction). Thus, since the positioning of the stator 4 in the height direction, the radial direction, and the circumferential direction is performed, the positioning accuracy of the stator 4 with respect to the motor housing 31 is improved.

As shown in FIG. 2, each of the covering portions 43 of the insulators 42A and 42B includes wall surfaces 43a, 43b, and 43c. The wall surface 43a covers the circumferential side surface of the tooth portion 41a. The wall surface 43b covers the radial side surface of the arc portion 41b. The wall surface 43 c covers the radial inner surface of the stator core 41. Therefore, each coating | coated part 43 has the cylindrical shape which separated between the pair of wall surfaces 43b, and is protrudingly provided.

A pair of insulators 42A and 42B is used for one motor unit 3. As shown in FIG. 2, the insulator 42 </ b> A is attached to one end (the lower end in FIG. 2) of the stator core 41 in the axial direction from the covering portion 43 side. The insulator 42B is attached to the other end (upper end in FIG. 2) of the stator core 41 in the axial direction from the covering portion 43 side.

The protruding height H1 of the covering portion 43 is slightly longer than half of the height H0 of the stator core 41. For this reason, in the middle of the axial direction of the stator core 41, the tip of the covering portion 43 of one insulator 42A and the tip of the covering portion 43 of the other insulator 42B overlap each other.

Specifically, the insulators 42A and 42B are provided with a covering portion 43 provided with a first fitting portion 43I as an inner peripheral side protruding wall and a second fitting portion 43R as an inner peripheral side concave portion. The covering portion 43 is mixed. Eight tooth portions 41a are provided at a constant pitch in the circumferential direction (every 45 °). Insulators 42A and 42B are alternately provided with covering portions 43 having first fitting portions 43I and covering portions 43 having second fitting portions 43R every 45 °. In addition, although the tooth | gear part 41a may be more or less than 8, it needs to be made into the multiple of two.

The covering portion 43 provided with the first fitting portion 43I of the insulator 42A and the covering portion 43 provided with the second fitting portion 43R of the insulator 42B are arranged to face each other. At the same time, the covering portion 43 including the second fitting portion 43R of the insulator 42A and the covering portion 43 including the first fitting portion 43I of the insulator 42B are arranged to face each other. By fitting the insulator 42A and the insulator 42B in the axial direction from this state, the first fitting portion 43I and the second fitting portion 43R are fitted to each other corresponding to all the tooth portions 41a. .

With the configuration described above, as shown in FIG. 3, the tips of the covering portions 43 of the insulators 42A and 42B (that is, the first fitting portion 43I and the second fitting portion 43R) are overlapped, and the tooth portion 41a and A portion of the arc portion 41 b facing the winding 44 is covered with the covering portion 43 without a gap. The winding 44 is wound around the tooth portion 41 a covered with the covering portion 43. That is, the tooth portion 41a (stator 4) and the winding 44 are more reliably insulated from each other by the two insulators 42A and 42B including the covering portion 43 in which the axial ends are fitted to each other.

The winding 44 is continuously wound around the plurality of tooth portions 41a. That is, one conducting wire is sequentially wound around all the tooth portions 41a, and a plurality of windings 44 are constructed. Therefore, both ends of the conducting wire are connected to terminals 47 (see FIG. 3) extending from two adjacent windings 44, respectively.

Further, as shown in FIG. 1, a control board 46 is disposed inside the motor housing 31. The control board 46 receives a signal from the position detection sensor 8 that detects the rotational position of the rotor 5, and controls the magnetic field generated by the winding 44.

As shown in FIGS. 2 and 3, mounting cylinders 48 a project from the tooth portions 41 a corresponding to the above-described terminals 47 on the insulator 42 </ b> B close to the control board 46. The terminal 47 is inserted and attached to the mounting cylinder 48a. Further, support protrusions 48 b are provided so as to protrude from the tooth portions 41 a not corresponding to the terminals 47. The support protrusion 48b supports the attached control board 46.

The control board 46 and the winding 44 are electrically connected via a terminal 47.

Specifically, the end of the conducting wire constituting the winding 44 is electrically connected to the exposed portion of the terminal 47 inserted into the mounting cylinder 48a, and the tip of the terminal 47 is provided in the hole 46b provided in the control board 46. Inserted into. In this way, the control board 46 and the winding 44 are electrically connected.

As shown in FIG. 9, the control board 46 has a substantially rectangular shape, and a semicircular notch 46a is formed on each of the pair of long sides of the control board 46. On the other hand, as shown in FIGS. 5, 6, 8, and 9, the motor housing 31 is provided with an engaging protrusion 31j at a position corresponding to the recess 46a. The engagement protrusion 31j extends along the central axis C direction. As shown in FIGS. 5 and 6, a substrate placement surface 31p that is in surface contact with the control substrate 46 is formed on the base end side (lower side in FIGS. 5 and 6) of the engagement protrusion 31j. Yes. By providing the control board 46 with the notches 46a and providing the motor housing 31 with the engaging protrusions 31j and the board mounting surface 31p, the control board 46 is guided by the notches 46a and the engaging protrusions 31j, and the board mounting surface. It is mounted on 31p. The position shift of the control board 46 is suppressed by the notch 46a, the engagement protrusion 31j, and the board placement surface 31p. Further, by the surface contact between the control substrate 46 and the substrate placement surface 31p, the control substrate 46 is reliably held at the specified holding position, and rattling is also suppressed.

The control board 46 is fixed to the motor housing 31 by a fastening member 10 (see FIG. 9) such as a screw. Specifically, as shown in FIGS. 5 and 6, a substrate mounting boss having a mounting surface 31r on the same plane as the substrate mounting surface 31p as an upper surface and having screw holes formed therein. 31q is provided, and the screw 10 is screwed into this screw hole. In this way, the control board 46 is fixed to the motor housing 31. Instead of (in addition to) the substrate mounting boss 31q, a screw hole may be provided on the same plane as the substrate mounting surface 31p.

The pump 1 includes a connector (not shown) connected to an external power supply source, and power from the power supply source is supplied to the control board 46 via an electrical wiring. The electrical wiring is electrically connected to the control board 46 by soldering or the like to a hole 46c provided in the control board 46.

As shown in FIGS. 1 and 4, the control board 46 is provided with a sensor holder 46d, and the position detection sensor 8 is disposed through the sensor holder 46d.

The position detection sensor 8 receives the magnetic flux of the magnet 52 of the rotor 5, recognizes the position of the magnet 52 with respect to the tooth portion 41 a, and outputs a signal to a control unit (not shown) provided on the control board 46. Based on this signal, the control unit performs appropriate rotation control. As shown in FIG. 4, the position detection sensor 8 is arranged so that the angle between the position detection sensor 8 and the tooth portion 41a becomes the optimum angle D, and the motor efficiency during operation is optimized. The optimum angle D is an angle between the position detection sensor 8 and the tooth portion 41a at which the motor efficiency during operation is optimum, and is obtained by electromagnetic field analysis or the like.

The rotor 5 is formed of a rotating cylinder 51 and a plurality of magnets (or magnets having a plurality of poles) 52 as shown in FIG. The rotating cylinder 51 is integrally extended from the impeller 23. The magnets 52 are attached at equal intervals in the circumferential direction of the rotating cylinder 51. The magnets 52 are arranged so that N poles and S poles are alternately arranged. The rotor 5 is rotatably supported on the support shaft 32 through a bearing 53 provided on the inner periphery of the rotor 5 in the rotor accommodating chamber 34.

Therefore, the rotor 5 of the motor unit 3 is rotated by the application of a control current from the control board 46 to the winding 44, and the impeller 23 integrated with the rotor 5 is rotated to drive the pump unit 2. By the driving of the pump unit 2, the fluid sucked from the suction port 22a is discharged from the discharge port 22b.

As described above, the attachment portion 41c for attaching the stator core (stator) 41 to the motor housing (casing) 31 is provided on the stator core (stator) 41, and the provision for defining the position of the attachment portion 41c with respect to the motor housing (casing) 31 is provided. A portion 31 k is provided in the motor housing (casing) 31. For this reason, when the stator 4 is fixed to the motor housing (casing) 31, the displacement of the stator 4 is suppressed. As a result, variations in pump performance are suppressed.

As described above, when the magnetic field by the winding 44 is controlled based on the signal from the position detection sensor 8, the position is detected so that the angle between the position detection sensor 8 and the tooth portion 41a becomes the optimum angle D. The sensor 8 needs to be arranged. For this reason, if the position of the stator 4 shifts when the stator 4 is fixed to the motor housing (casing) 31, the angle between the position detection sensor 8 and the tooth portion 41a varies, resulting in a decrease in motor efficiency and variations in pump performance. Will occur. According to the present embodiment, since the displacement of the stator 4 can be suppressed as described above, the variation in angle between the position detection sensor 8 and the tooth portion 41a can be suppressed. As a result, a decrease in motor efficiency can be suppressed, and the pump performance can be further improved.

Further, by fitting the defining portion 31k and the mounting portion 41c to each other, the stator 4 can be fixed to the motor housing (casing) 31 and the stator 4 can be positioned relative to the motor housing (casing) 31 at the same time. For this reason, it is not necessary to perform attachment and positioning at different locations, and space can be saved. Further, the assembly workability of the pump 1 can be improved.

Further, since the attachment portion 41 c is formed as a plurality of protrusions provided on the side portion of the stator core (stator) 41, the stator 4 can be stably attached to the motor housing (casing) 31.

Particularly, since the attachment portion 41c extends in the horizontal direction (direction orthogonal to the central axis C), the stator 4 can be attached to the inner wall 31b simply by moving the stator 4 in the central axis C direction. That is, the defining portion 31k and the attachment portion 41c can be easily fitted to each other. Further, the stator 4 can be stably attached to the motor housing (casing) 31 by extending the attachment portion 41 c in the horizontal direction (a direction orthogonal to the central axis C).

Also, by providing the defining portion 31k as a recess in the motor housing (casing) 31, the mounting portion 41c provided as a protrusion can be easily fitted into the defining portion 31k.

In addition, since the defining portion 31k can be formed as a recess only by providing a pair of ribs 31i, the structure of the portion where the stator 4 is attached to the motor housing (casing) 31 can be simplified. As a result, the motor housing (casing) 31 can be easily manufactured.

Further, by providing the rib 31i with the tapered portion 31l that extends the inner width of the concave portion (the defining portion 31k) toward the tip, the mounting portion 41c can be guided by the tapered portion 31l and inserted into the defining portion 31k. For this reason, it becomes easy to insert the attachment portion 41c into the defining portion 31k, and the attachment portion 41c can be easily fitted into the defining portion.

In particular, the inner width of the vertical surface 31n of the pair of two ribs 31i is made substantially equal to the width of the mounting portion 41c (distance between both side surfaces 41e), and the width between the inclined surfaces 31m gradually increases toward the opening side. Have been widely used. For this reason, the attachment part 41c can be easily inserted into the defining part 31k. Further, after the mounting portion 41c is inserted into the defining portion 31k (after fitting), the mounting portion 41c is firmly held by the defining portion 31k. As a result, the displacement of the stator 4 is suppressed.

Further, since the defining portion 31k and the mounting portion 41c are fixed by the screw (fastening member) 45, the displacement of the stator 4 can be more effectively suppressed. As a result, the pump performance can be further improved. In particular, this structure is effective for mounting in a place that receives external vibration, such as an automobile.

Next, a pump drive device equipped with the above-described pump 1 will be described.

FIG. 10 shows a hybrid vehicle 100 having a cooling device 101 as a pump drive device.

The hybrid vehicle 100 includes an engine 102, a motor generator 103, a battery 104, and an inverter 105, as shown in FIG. The motor generator 103 outputs vehicle driving force or generates power. The battery 104 is configured to be chargeable / dischargeable. Inverter 105 controls driving of motor generator 103.

The engine 102 is an internal combustion engine that uses gasoline or the like as fuel, and converts thermal energy generated by combustion of the fuel into kinetic energy (driving force) and outputs the kinetic energy.

The motor generator 103 is, for example, a brushless DC motor. The motor generator 103 is configured to be able to take two operating states: a mode that functions as a motor that outputs driving force, and a mode that functions as a generator.

The battery 104 is a power storage device configured to be chargeable / dischargeable, and is composed of, for example, a secondary battery such as nickel metal hydride or lithium ion.

The inverter 105 is configured to perform bidirectional power conversion, and has a function of converting power generated by the motor generator 103 (AC power) into DC power for charging the battery 104. Similarly, it has a function of converting DC power from the battery 104 into AC power for driving the motor generator 103.

The output shaft of the engine 102 is connected to one end of the shaft of the motor generator 103 via a clutch (not shown). The other end of the shaft of the motor generator 103 is connected to an input shaft of an automatic transmission (not shown) via another clutch (not shown). The output shaft of the automatic transmission is connected to the drive shaft of the wheel via a differential device.

The motor generator 103 is connected to the battery 104 via the inverter 105. The battery 104 can supply driving power to the motor generator 103 and charge generated power from the motor generator 103.

The motor generator 103 generates vehicle driving force by itself or assisting the engine 102. Further, the motor generator 103 can generate power by being driven by the output of the engine 102 or the input from the wheels as a generator.

Thus, the hybrid vehicle 100 travels by generating vehicle driving force with the output of at least one of the engine 102 and the motor generator 103.

More specifically, when the vehicle starts and runs at low speed, the motor generator 103 mainly runs. That is, the hybrid vehicle 100 travels by driving the motor generator 103 (brushless DC motor) with the electric power from the battery 104.

During normal driving (during steady driving), at least one of the engine 102 and the motor generator 103 is used for driving with the best fuel efficiency. During acceleration, both are used to output maximum power and accelerate strongly. To do.

During deceleration / braking, the motor generator 103 regenerates power and stores the recovered energy in the battery 104.

When the vehicle is stopped, both the engine 102 and the motor generator 103 are stopped to prevent wasteful fuel consumption and power consumption due to idle operation.

The inverter 105 is composed of a power semiconductor element. Since the inverter 105 generates heat due to the current flowing through itself, a cooling device 101 for cooling the inverter 105 is provided.

The cooling device 101 is provided with a cooling water channel 101a, and the cooling water is circulated in the order of the pump 1, a radiator (not shown), the inverter 105, and the pump 1 along the cooling water channel 101a. By forcibly circulating the cooling water in the cooling water passage 101a by the pump 1, heat exchange is performed between the inverter 105 and the cooling water, and the inverter 105 is cooled. Further, the cooling water heated by heat exchange with the inverter 105 is cooled when passing through a radiator (not shown).

The cooling device 101 uses the above-described pump 1 (see FIG. 1).

Thus, by using the above-described pump 1 for the cooling device 101, the cooling device 101 with little variation in pump performance can be realized.

Note that the hybrid vehicle is not limited to the one in the present embodiment, and a known hybrid vehicle may be used.

The preferred embodiment has been described above, but the present invention is not limited to the above embodiment, and various modifications are possible.

For example, in the above-described embodiment, application to a pump incorporated in the motor-integrated pump 1 has been exemplified, but the present invention can also be applied to other than the above-described pump.

In the above embodiment, the stator core 41 surrounds the rotor 5. However, the present invention can also be applied to a configuration in which the rotor surrounds the stator core (that is, a configuration in which the tooth portion protrudes outward from the outer periphery of the stator core).

In the above embodiment, the inverter cooling device for the hybrid vehicle is exemplified as the pump drive device. However, the present invention can be applied to devices other than the pump drive device described above. For example, the pump drive device of the present invention can be applied to a hot water circulation pump for ensuring in-vehicle heating during idle stop. Moreover, the pump drive device of the present invention can also be applied to devices other than in-vehicle devices (for example, washing machines, hot water supply units, dishwashers, etc.).

Also, the specification part, mounting part, casing, and other detailed specifications (shape, size, layout, etc.) can be changed as appropriate.

Claims (8)

A pump,
A pump unit having an impeller for sucking and discharging liquid;
A motor unit for driving the pump unit;
A casing in which the pump unit and the motor unit are accommodated, and a liquid suction port and a discharge port are formed;
The motor unit includes a stator having a coil and a rotor rotated by the stator;
An attachment portion for attaching the stator to the casing is provided in the stator,
A defining portion that defines the position of the mounting portion with respect to the casing is provided in the casing. The pump according to claim 1, wherein the defining portion and the mounting portion are fitted to each other. The pump according to claim 1 or 2, wherein the attachment portion is a plurality of protrusions provided on a side portion of the stator. The pump according to claim 3, wherein the defining portion is a plurality of recesses provided in the casing. The pump according to claim 4, wherein the recess is formed by a mounting surface of the mounting portion and a pair of ribs protruding from the mounting surface. The pump according to claim 5, wherein the rib is provided with a tapered portion that expands the inner width of the concave portion toward the tip. The pump according to claim 1 or 2, wherein the defining portion and the attachment portion are fixed by a fastening member. A pump drive device equipped with the pump according to claim 1 or 2.

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