Multi-pole few-slot torque motor stator

Abstract

The low-speed large-torque motor comprises the stator with an armature winding and the rotor with a permanent magnet, the stator is composed of Ps large teeth, Ps stator grooves and a stator yoke, the rotor is composed of a rotor yoke and Ps pairs of magnetic poles, the stator and the rotor are coaxially installed, and the stator and the rotor are coaxially installed. A concentrated armature winding is wound on each large tooth, a magnetic field modulation module is arranged at one end of each large tooth and comprises small teeth and a groove, the groove is formed in one end of each large tooth, the small teeth are arranged on the two sides of the groove, and the magnetic poles comprise a magnet N pole and a magnet S pole. The number of slots in each pair of poles is reduced on average, a large number of small slots are replaced by a small number of large slots, the slot fullness rate and the motor performance are improved, the magnetic field modulation module with two small teeth and one small slot is adopted, the required torque performance can be achieved with a small number of stator slots, the number of elements is small, the wire embedding process and wiring can be simplified, and the cost is reduced. And the cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet motors, in particular to a multi-pole and few-slot torque motor stator. Background Art

[0002] The torque density of traditional permanent magnet synchronous motors has been continuously improved to meet the needs, but due to the inherent characteristics of permanent magnet synchronous motors, the torque density of traditional permanent magnet synchronous motors has reached a bottleneck. Therefore, in order to further improve the torque density of the motor, in addition to the application of new materials and the improvement of cooling technology, changing the structure of the motor to propose a new structure of the motor has become the main research goal and direction. In the field of electric vehicles, the demand for high torque density motors is particularly prominent. In order to meet this need, many new motors with higher torque density have been proposed. Among them, the vernier motor is based on the magnetic field modulation principle of the magnetic gear to achieve the self-increasing effect of the magnetic field, which can achieve the effect of improving the torque and power density of the motor. Compared with the magnetic gear compound motor, this type of motor has only one air gap, similar to an ordinary permanent magnet motor, so the motor structure is relatively simple.

[0003] The Chinese patent with publication number CN201220020271.X discloses a permanent magnet vernier motor for low speed and high torque, with two grooves and three small teeth on one stator tooth; the Chinese patent with publication number CN202011592235.6 discloses a method for improving the power factor of a concentrated winding outer rotor vernier motor, whose stator teeth are U-shaped teeth, and small grooves are respectively opened on the left and right small teeth; the Chinese patent with publication number CN201811474314.X discloses a DC bias current type stator-rotor dual permanent magnet vernier motor, the stator teeth have a groove, and the stator permanent magnet is embedded. The Chinese patent with publication number CN201910866404.1 discloses a magnetic circuit decomposition type vernier permanent magnet motor, with a U-shaped groove on the stator teeth, but the patent does not point out the feasible pole slot matching.

[0004] The above-mentioned vernier motor has a large number of stator slots, resulting in a small slot space. When the stator teeth are wound into armature windings, the space occupied by the insulating material increases, the slot fill rate is low, and the motor performance is affected. At the same time, the number of components is large, the process is complex, and the processing cost is high. In view of this situation, a torque motor stator with more poles and fewer slots is proposed. Summary of the invention

[0005] The object of the present invention is to provide a multi-pole and few-slot torque motor stator, which can effectively solve the shortcomings of the above-mentioned background technology. The present invention reduces the average number of slots under each pair of poles, replaces a large number of small slots with a smaller number of large slots, improves the slot fill rate and motor performance, and adopts a magnetic field modulation module with two small teeth and one small slot, which can achieve the required torque performance with a smaller number of stator slots. The number of components is small, which can simplify the wire embedding process and wiring, and help reduce costs.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A multi-pole and few-slot torque motor stator, a low-speed high-torque motor comprising a stator with an armature winding and a rotor with a permanent magnet, the stator is composed of a P s Large teeth, P s The rotor is composed of a stator slot and a stator yoke, and the rotor is composed of a rotor yoke and a P s Pair of magnetic poles.

[0008] Furthermore, the stator and the rotor are installed coaxially, a concentrated armature winding is wound on each of the large teeth, and a magnetic field modulation module is provided at one end of the large teeth.

[0009] Furthermore, the magnetic field modulation module includes small teeth and grooves, one end of the large tooth is provided with a groove, and small teeth are provided on both sides of the groove.

[0010] Furthermore, the magnetic poles include a magnet N pole and a magnet S pole.

[0011] Furthermore, the widths of the small teeth in the magnetic field modulation module are the same, and the width of the groove is greater than the width of the small teeth.

[0012] Furthermore, the depth of the groove in the magnetic field modulation module is greater than the width of the air gap between the stator and the rotor.

[0013] Furthermore, the width of the stator slot opening is three times greater than the width of the magnetic field modulation module.

[0014] Furthermore, in the present invention, the number of large teeth P s When the rotor pole pair number P is 12, r 19 or 20 can be selected. s When the number of rotor pole pairs is P, the fundamental wave Z of the modulation module is 24. r When the modulated magnetic flux density P module is 5, forming a 12-slot 10-pole permanent magnet motor. r When the modulated magnetic flux density P module It is 4, forming a 12-slot 8-pole permanent magnet motor.

[0015] Furthermore, in the present invention, the number of large teeth P sWhen the rotor pole pair number P is 18, r 26 or 28 can be selected. s When the number of rotor pole pairs is P, the fundamental wave Z of the modulation module is 36. r When the modulated magnetic flux density P module is 10, forming an 18-slot 20-pole permanent magnet motor. r When the modulated magnetic flux density P module It is 8, forming an 18-slot 16-pole permanent magnet motor.

[0016] Furthermore, in the present invention, the number of large teeth P s When the rotor pole pair number P is 24, r 38 or 40 can be selected. s When the number of rotor pole pairs is P, the fundamental wave Z of the modulation module is 48. r When the modulated magnetic density P module is 10, forming a 24-slot 20-pole permanent magnet motor. r When the modulated magnetic flux density P module It is 8, forming a 24-slot 16-pole permanent magnet motor.

[0017] Beneficial effects of the present invention:

[0018] 1. The present invention adopts a magnetic field modulation module with two small teeth and one small slot, which can achieve the required torque performance with a smaller number of stator slots;

[0019] 2. The present invention reduces the number of slots per pole pair on average, and replaces a large number of small slots with a small number of large slots, which can reduce the space occupied by slot insulation, which is beneficial to improving the slot fill rate and thus improving the performance of the motor;

[0020] 3. The present invention has fewer components, which can simplify the wire embedding process and wiring, and help reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 is a schematic diagram of the motor structure of embodiment 1 of the present invention;

[0023] Figure 2 is a schematic diagram of the motor structure of embodiment 2 of the present invention;

[0024] Figure 3 It is a schematic diagram of the partial structure of the motor of Example 1 and Example 2 of the present invention;

[0025] Figure 4 is a schematic diagram of the motor structure of embodiment 3 of the present invention;

[0026] In the figure: 1. stator; 2. rotor; 3. large tooth; 4. magnetic field modulation module; 5. magnet N pole; 6. magnet S pole; 7. small tooth; 8. groove; 9. stator slot. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] Example 1

[0030] See also Figure 1 As shown, a multi-pole and few-slot torque motor stator, a low-speed and high-torque motor includes a stator 1 with an armature winding and a rotor 2 with a permanent magnet, the stator 1 and the rotor 2 are coaxially mounted, the stator 1 consists of 24 large teeth 3, 24 stator slots 9 and a stator yoke, a concentrated armature winding is wound on the large teeth 3, the large teeth 3 consist of a groove 8 and two small teeth 7, as a magnetic field modulation module 4, the rotor 2 consists of a rotor yoke and 38 pairs of magnetic poles, and the magnetic poles include a magnet N pole 5 and a magnet S pole 6.

[0031] The low-speed, high-torque motor of this embodiment is a three-phase motor, so the number 24 of the large teeth 3 is an integer multiple of 3.

[0032] Small tooth 7 width w t1 The same, groove 8 width w t2 Greater than the width w of small tooth 7 t1 , the depth h of the groove 8 t Greater than the air gap width l between stator 1 and rotor 2 g , the slot width w of the stator slot 9 slt Three times greater than the width of the magnetic field modulation module 4 2w t1 +w t2 , which can achieve better t2 The magnetic field modulation effect, the local structure diagram of the motor is as follows Figure 3 shown.

[0033] In this example, the number of large teeth 3 is P s When the value is 24, the fundamental wave Z of the magnetic field modulation module 4 is 48, and the number of pole pairs of the rotor 2 is P r is 38, and the number of magnetic flux pole pairs after modulation is P module is 10, forming a permanent magnet motor with 24 slots and 20 poles.

[0034] Example 2

[0035] See also Figure 2 As shown, the low-speed, high-torque motor includes a stator 1 with an armature winding and a rotor 2 with a permanent magnet. The stator 1 is coaxially mounted with the rotor 2. The stator 1 consists of 24 large teeth 3, 24 stator slots 9 and a stator yoke. A concentrated armature winding is wound on the large teeth 3. The large teeth 3 consist of a groove 8 and two small teeth 7, which serve as a magnetic field modulation module 4. The rotor 2 consists of a rotor yoke and 38 pairs of magnetic poles. The magnetic poles include a magnet N pole 5 and a magnet S pole 6.

[0036] The low-speed, high-torque motor of this embodiment is a three-phase motor, so the number 24 of the large teeth 3 is an integer multiple of 3.

[0037] Small tooth 7 width w t1 The same, groove 8 width w t2 Greater than the width w of small tooth 7 t1 , the depth h of the groove 8 t Greater than the air gap width l between stator 1 and rotor 2 g , the slot width w of the stator slot 9 slt Three times greater than the width of the magnetic field modulation module 4 2w t1 +w t2 , can achieve a better magnetic field modulation effect, the partial diagram of the motor structure diagram is as follows Figure 3 shown.

[0038] In this embodiment, the number P of the large teeth 3 is s When the value is 24, the fundamental wave Z of the magnetic field modulation module 4 is 48, and the number of pole pairs of the rotor 2 is P r is 40, the number of magnetic flux pole pairs after modulation is P module It is 8, forming a 24-slot 16-pole permanent magnet motor.

[0039] Example 3

[0040] The low-speed high-torque motor does not limit the shape of the stator slot 9, but the size of the stator slot 9 must meet the following conditions:

[0041] Small tooth 7 width w t1 The same, groove 8 width w t2 Greater than the width w of small tooth 7 t1 ; Depth h of groove 8 t Greater than the air gap width l between stator 1 and rotor 2g ; The slot width w of the stator slot 9 slt Three times greater than the width of the magnetic field modulation module 4 2w t1 +w t2 , a better magnetic field modulation effect can be achieved.

[0042] In this embodiment, in order to facilitate winding, the optional motor partial structure diagram is as follows: Figure 4 shown.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A multi-pole and few-slot torque motor stator, a low-speed high-torque motor comprising a stator (1) with an armature winding and a rotor (2) with a permanent magnet, characterized in that: The stator (1) is composed of P s Large teeth (3), P s The rotor (2) is composed of a rotor yoke and a stator slot (9) and a stator yoke. s Pair of magnetic poles.

2. A multi-pole and few-slot torque motor stator according to claim 1, characterized in that: The stator (1) and the rotor (2) are coaxially mounted, a concentrated armature winding is wound on each of the large teeth (3), and a magnetic field modulation module (4) is provided at one end of the large teeth (3).

3. The multi-pole and few-slot torque motor stator according to claim 2, characterized in that: The magnetic field modulation module (4) comprises a small tooth (7) and a groove (8); one end of the large tooth (3) is provided with the groove (8), and small teeth (7) are provided on both sides of the groove (8).

4. The multi-pole and few-slot torque motor stator according to claim 1, characterized in that: The magnetic poles include a magnet N pole (5) and a magnet S pole (6).

5. The multi-pole and few-slot torque motor stator according to claim 3, characterized in that: The widths of the small teeth (7) in the magnetic field modulation module (4) are the same, and the width of the groove (8) is greater than the width of the small teeth (7).

6. The multi-pole and few-slot torque motor stator according to claim 3, characterized in that: The depth of the groove (8) in the magnetic field modulation module (4) is greater than the width of the air gap between the stator (1) and the rotor (2).

7. The multi-pole and few-slot torque motor stator according to claim 3, characterized in that: The width of the stator slot (9) is three times greater than the width of the magnetic field modulation module (4).

8. The multi-pole and few-slot torque motor stator according to claim 1, characterized in that: The number P of the large teeth (3) s =12, pole pair number P r = 19 or 20, number of large teeth (3) P s =18, pole pair number P r =26 or 28, number of large teeth (3) P s =24, pole pair number P r =38 or 40.

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