CN203942424U - A kind of without yoke closed slot multi-disc type permanent magnet motor - Google Patents

Abstract

The utility model discloses a kind of without yoke closed slot multi-disc type permanent magnet motor, it comprises by rotating shaft, bearing, front end housing, the common motor housing forming of rear end cap and casing, with the fixing a plurality of rotors of rotating shaft and a plurality of stators between adjacent rotor, stator is by two stator external tooths, stator internal tooth between two stator external tooths, plug in stator, the outer plug of stator and winding form without yoke closed slot structure, rotor is Combined inclined electrode structure, comprise spaced apart and coaxial vertically a plurality of rotor disks and be fitted in the fan-shaped permanent magnet on rotor disk, the utility model proposes without yoke closed slot multi-disc type permanent magnet motor, there is raising copper factor, save core material, improve torque quality, improve torque density and improve system low speed, the advantage of the overall operation efficiencies such as underloading.

Description

A yokeless closed slot multi-disc permanent magnet motor

technical field

The utility model belongs to the technical field of motors, and more specifically relates to a multi-disk permanent magnet motor.

Background technique

The most notable feature of electric vehicles today is frequent start and stop, acceleration and deceleration, rather than running at a certain constant speed. Based on the performance requirements of electric vehicles, the motor system used in them is required to have high instantaneous power and power density. It should have higher high and low speed comprehensive efficiency. Due to its own characteristics, the axial permanent magnet motor is very suitable for electric vehicle driving occasions, while the multi-disk permanent magnet motor can further improve the torque density and instantaneous power, and can also effectively solve the problem of the drive system at low speed and low load through winding switching. The problem of low efficiency under working conditions.

The utility model patent 201210147618.1 discloses a modular multi-disk permanent magnet brushless motor. At least two stator power modules are arranged in the motor, and a fan-ring hybrid winding and bidirectional oblique poles are used to realize modular control. Patent 200920189389.3 discloses a multi-disk permanent magnet hub motor structure for electric vehicles, which is characterized by two sets of stators composed of four opposing stator cores, two single-sided rotor discs and a double-sided rotor disc to form the rotor The single-sided disc rotor is fixed at both ends of the motor through the motor shaft, the double-sided rotor disc is located in the middle of the two sets of stators, and the double-sided rotor disc and the single-sided rotor disc are coaxially fixed. Both of the above two patents propose a multi-disk permanent magnet motor, but the structure is complex, there is a stator core yoke, and the material utilization rate is not high enough, which has a certain impact on the system efficiency.

In addition, the cogging torque of the existing multi-disk permanent magnet motor is generally formed by the superposition of the cogging torque generated by the single-disc motor. The cogging torque is large, which affects the reliability of the motor operation, control positioning accuracy, etc. All have brought adverse effects and caused problems such as vibration and noise.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a yokeless closed-slot multi-disc permanent magnet motor which can not only improve material utilization, but also improve torque quality, torque density and system efficiency.

In order to achieve the above object, the utility model provides a yokeless closed slot multi-disc permanent magnet motor, which includes a plurality of rotors fixed with the rotating shaft, a plurality of stators located between adjacent rotors, and a rotating shaft, a bearing, a front end The motor casing is composed of the cover, the rear end cover and the casing, wherein,

The stators are composed of stator outer teeth, stator inner teeth, stator inner plugs, stator outer plugs and windings, wherein the number of stator outer teeth is 2, and they are disc-shaped and opposite to each other, and at the center There are shaft holes aligned with each other; the stator inner plug presents a ring structure with the same diameter as the shaft hole, and is connected between the two stator outer teeth along the outer edge of the shaft hole of the stator outer teeth; the stator outer plug It presents an annular structure with the same diameter as the stator outer teeth and has an opening, and is coupled between two stator outer teeth along the outer edge of the stator outer teeth. The stator inner plug (12), the stator outer plug (7) and the stator The outer teeth (8) are all fixed with screws through the screw holes (20), and the windings are wound on the inner teeth of the stator accordingly; in addition, on the end face of the disc-shaped structure of the outer teeth of the stator, there are a plurality of stators located on the outer edge of the shaft hole and the stator. Between the outer edges of the outer teeth and the inner tooth slots arranged at intervals along the circumferential direction, and a plurality of circular through holes arranged in the radial direction are processed between the adjacent inner tooth slots; the inner teeth of the stator pass through the The protrusions that match the internal tooth slots are fitted between the internal tooth slots, thereby maintaining the connection between the outer teeth of the stator, forming a yokeless closed slot stator structure;

The rotor is a combined oblique pole structure, including a plurality of coaxial rotor disks distributed at intervals along the axial direction. One-sided rotor disk and multiple double-sided rotor disks located between them, and on the inner end surface of the front single-sided rotor disk, the inner end surface of the rear single-sided rotor disk, and all the double-sided rotor disks A plurality of sector-shaped permanent magnets are arranged on both inner and outer end surfaces of the rotor disk and are evenly spaced along the circumferential direction.

As a further preference, the sector-shaped permanent magnet is concentric with the rotor disk where it is located, and its inclination angle α satisfies In addition, the axial stagger angle β of the sector-shaped permanent magnets on two adjacent rotor disks satisfies And ensure that the axial stagger angle of the sector-shaped permanent magnets on the two rotor disks separated by one rotor disk is 0.

As a further preference, the outer teeth of the stator are made of electric magnets.

As a further preference, the inner teeth of the stator are made of soft magnetic composite material through powder metallurgy.

Generally speaking, compared with the prior art, the above technical solutions conceived by the utility model can achieve the following beneficial effects:

1. There is no stator yoke structure, the stator is directly composed of stator outer teeth and stator inner teeth, the stator yoke is eliminated, the stator saves iron core materials, and also reduces stator iron loss, improving the torque density and efficiency of the motor;

2. The stator has a closed slot structure. The inner structure of the stator slot is composed of two stator outer teeth and stator inner teeth. There is no traditional slot for winding. The winding is directly wound on the stator inner teeth. Simple, high slot full rate, while simplifying the structure and reducing the process and at the same time, it also improves the air gap magnetic density, reduces the eddy current loss, greatly reduces the cogging torque and improves the efficiency of the motor, and the outer teeth of the stator are composed of electric magnets There are a series of small holes in the sheet structure, and the large and small holes not only reduce the magnetic flux leakage effect, but also improve the cooling effect of the motor;

3. The rotor adopts a combined oblique pole structure, which is composed of different oblique pole directions and axial relative positions of multi-layer permanent magnets, which not only improves the air gap magnetic density, reduces the cogging torque, but also improves the sine degree of the back EMF , to further reduce torque ripple.

Description of drawings

Fig. 1 is the structural schematic diagram of multi-disc permanent magnet motor with yokeless closed slots of the present invention;

Fig. 2 is the stator structure schematic diagram of the yokeless closed slot multi-disc permanent magnet motor of the utility model;

Fig. 3 is the sectional structure schematic diagram of the stator of the yokeless closed slot multi-disc permanent magnet motor of the utility model;

Fig. 4 is the schematic diagram of the outer teeth of the stator of the yokeless closed slot multi-disk permanent magnet motor of the present invention;

Fig. 5 is a schematic diagram of the inner teeth of the stator of the yokeless closed slot multi-disk permanent magnet motor of the present invention;

Fig. 6 is a schematic diagram of the outer stator plug of the yokeless closed slot multi-disk permanent magnet motor of the present invention;

Fig. 7 is a schematic diagram of the stator inner plug in the yokeless closed slot multi-disk permanent magnet motor of the present invention;

Fig. 8 is an overall schematic diagram of the permanent magnet combined oblique pole in the yokeless closed slot multi-disk permanent magnet motor of the present invention;

Fig. 9 is a partial schematic diagram of the permanent magnet combined oblique pole in the yokeless closed slot multi-disc permanent magnet motor of the present invention.

Throughout the drawings, the same reference numerals are used to designate the same elements or structures, wherein:

1-rotating shaft, 2-front cover, 3-front single-sided rotor disc, 4-casing, 5-fixed key of stator, 6-second stator, 7-outer plug of stator, 8-outer tooth of stator, 9-sector Permanent magnet, 10-rear single-sided rotor disc, 11-rear end cover, 12-stator inner plug, 13-sensor magnetic ring, 14-bearing, 15-double-sided rotor disc, 16-first stator, 17- Stator internal teeth, 18-circular through hole, 19-internal tooth slot, 20-screw hole, 21-wire outlet hole, 22-air outlet hole, 23-winding

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

As shown in Figure 1, the yokeless closed slot multi-disk permanent magnet motor includes a motor casing composed of a rotating shaft 1, a bearing 14, a front end cover 2, a rear end cover 11 and a casing 4, and three rotors spaced apart from the rotating shaft. Disks 3, 10, 15 and two disk-type stators 6, 16 located between two adjacent rotors, the stators are fixed on the casing 4 through the stator fixed key 5, and the stator fixed key 5 is fixed at the center of the casing 4, permanently The magnets 9 are bonded on the rotor disks 3 , 10 , 15 to form the main magnetic poles, and the sensor magnetic ring 13 is fixed on the rear end cover 11 .

As shown in Figure 2, the stator 6 is composed of two stator outer teeth 8, a stator inner tooth 17 located between the two stator outer teeth 8, a stator inner plug 12, a stator outer plug 7 and a winding 23, wherein the stator outer teeth The quantity of 8 is 2, they are disc-shaped structure and mutually opposite, and are provided with mutually aligned shaft hole at its central position; Stator inner plug 12 presents the annular structure with the same diameter as described shaft hole (such as 7), and is coupled between the two stator outer teeth 8 along the outer edge of the shaft hole of the stator outer teeth 8; the stator outer plug 17 presents a ring structure with the same diameter as the stator outer teeth 8 and has an opening ( As shown in Figure 6), and along the outer edge of the stator outer teeth 8 are connected between the two stator outer teeth 8, and the winding 23 is wound on the stator inner teeth 17 accordingly; the stator inner plug 12, the stator outer plug 7 and The stator outer teeth 8 are fixed with screws through the screw holes 20, and the windings of each phase of each disc stator are independently drawn out.

As shown in Figure 4, on the end surface of the disc-shaped structure of the stator outer teeth 8, there are a plurality of internal tooth grooves 19 located between the outer edge of the shaft hole and the outer edge of the stator outer teeth 8 and arranged at intervals along the circumferential direction, and Four circular through-holes 18 made of electromagnets arranged in the radial direction are processed between the adjacent internal tooth slots 19; the stator internal teeth 17 pass through protrusions located at both ends and matched with the internal tooth slots. Fitted between the inner tooth slots 19, thereby keeping coupled between the outer teeth 8 of the stator, forming a yokeless closed slot stator structure. The internal tooth structure of the stator is shown in Figure 5.

As shown in Figure 8, the rotor is a combined oblique pole structure, including a plurality of coaxial rotor disks distributed at intervals along the axial direction. The rear single-sided rotor disk 10 on the end surface and the double-sided rotor disk 15 located between them are jointly composed, and the inner end surface of the front single-sided rotor disk 3, the inner end surface of the rear single-sided rotor disk 10, and the double-sided The inner and outer end surfaces of the rotor disk 15 are provided with a plurality of sector-shaped permanent magnets 9 evenly spaced along the circumferential direction. The sector-shaped permanent magnets are concentric with the rotor disk on which they are located, and their inclination angle α satisfies In addition, the axial stagger angle β of the sector-shaped permanent magnets on the front single-sided rotor disk 3 and the double-sided rotor disk 15 satisfies And the axial stagger angle of the fan-shaped permanent magnets on the front single-sided rotor disk and the rear single-sided rotor disk 3 is 0. It should be noted that a plurality of double-sided rotor disks can also be arranged between the front single-sided rotor disk 3 and the rear-end single-sided rotor disk 10, and the axial stagger angles β of the sector-shaped permanent magnets on two adjacent rotor disks all satisfy And ensure that the axial stagger angle of the sector-shaped permanent magnets on the two rotor disks separated by one rotor disk is 0.

As shown in Figure 9, the fan-shaped permanent magnet oblique angle α is the angle between an end point on the outer arc of the fan-shaped permanent magnet and the line connecting the center of the circle and an end point on the same side as the end point of the outer arc on the inner arc and the line connecting the center of the circle; The axial stagger angle β of the sector-shaped permanent magnets on two adjacent rotor disks is the included angle between the two symmetry axes of the front and rear adjacent sector-shaped permanent magnets.

In addition, the windings of the two disc-type stators of the motor are independently drawn out to form mutually independent control branches, which can be switched in series and parallel according to actual needs and distribute their respective power; the three-phase windings of each disc-type stator are independently drawn out, and Y-connection or Δ-connection is not performed internally. In specific applications, Y-Δ switching can be performed according to specific actual requirements, and the overall efficiency can be improved by rationally distributing the power of the two discs.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and modifications made within the spirit and principles of the utility model Improvements and the like should all be included within the protection scope of the present utility model.

Claims (3)

1. a yokeless closed slot multi-disc permanent magnet motor, comprising a plurality of rotors fixed with the rotating shaft, a plurality of stators positioned between adjacent rotors, and composed of rotating shaft (1), bearing (14), front end cover ( 2), the motor casing that the rear end cover (11) and the casing (4) jointly constitute, is characterized in that, Described stator is jointly made up of stator outer tooth (8), stator inner tooth (17), stator inner plug (12), stator outer plug (7) and winding (23), wherein the quantity of stator outer tooth (8) is 2, they are disc-shaped structures and facing each other, and are provided with mutually aligned shaft holes in their central positions; the stator inner plug (12) presents a ring-shaped structure with the same diameter as the shaft hole, and along the The outer edges of the shaft holes of the stator outer teeth (8) are connected between two stator outer teeth (8); the stator outer plug (17) presents an annular structure with the same diameter as the stator outer teeth (8) and has openings, and It is connected between two stator outer teeth (8) along the outer edge of the stator outer teeth (8), and the stator inner plug (12), stator outer plug (7) and stator outer teeth (8) all pass through the screw holes (20 ) is fixed with screws, and the windings (23) are wound on the stator inner teeth (17) accordingly; in addition, on the end face of the disc-shaped structure of the stator outer teeth (8), there are multiple (8) Internal tooth grooves (19) arranged at intervals along the circumferential direction between the outer edges, and a plurality of circular through holes (18) arranged in the radial direction are processed between adjacent internal tooth grooves (19) ); the inner teeth of the stator (17) fit between the inner tooth slots (19) through the protrusions at both ends, thereby keeping connected between the outer teeth of the stator (8), forming a yokeless closed slot stator structure; The rotor is a combined inclined pole structure, including a plurality of coaxial rotor disks distributed at intervals along the axial direction. The rear single-sided rotor disk (10) and a plurality of double-sided rotor disks (15) between them are jointly composed, and on the inner end surface of the front single-sided rotor disk (3), the rear single-sided A plurality of sector-shaped permanent magnets (9) evenly spaced along the circumferential direction are arranged on the inner end surface of the rotor disk and the inner and outer end surfaces of all the double-sided rotor disks (15). the 2. The yokeless closed slot multi-disk permanent magnet motor according to claim 1, wherein the sector-shaped permanent magnet is concentric with the rotor disc where it is located, and its angle of inclination α satisfies In addition, the axial stagger angle β of the sector-shaped permanent magnets on two adjacent rotor disks satisfies And ensure that the axial stagger angle of the sector-shaped permanent magnets on the two rotor disks separated by one rotor disk is 0. 3. The yokeless closed slot multi-disc permanent magnet motor according to claim 1 or 2, wherein the outer teeth of the stator are made of electric magnets. the