Motor and its armature winding assembly

Abstract

The present invention discloses a motor and its armature winding assembly, wherein the armature winding assembly of the motor includes two sets of windings with the same number of pole pairs, and the windings are centralized windings. In the armature winding assembly provided in the present application, the windings are provided in two sets, and the windings are centralized windings. They can be directly assembled on the stator core after the coil is formed in the early stage, thereby improving the assembly efficiency of the motor. At the same time, by flexibly configuring the positional relationship between the two sets of windings, specific harmonics in the air gap magnetic field can be effectively weakened, thereby improving the overall performance of the motor. At the same time, the armature winding assembly provided in the present application can effectively reduce the first-order harmonic of the air gap magnetic flux density of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motor windings, and in particular to an armature winding assembly of a motor. The present invention also relates to a motor comprising the armature winding assembly. Background Art

[0002] In a motor, when the number of poles and stator core teeth are close, the motor's cogging torque can be effectively reduced, especially when the difference is 1. However, when the number of stator core teeth and poles is close, current flowing through the windings generates abundant magnetic field harmonics. These harmonics, especially low-order harmonics, increase the motor's eddy current losses and core losses, worsen vibration and noise, and seriously affect the motor's performance.

[0003] At the same time, the armature winding on the traditional battery consists of two sets of windings with different pole pairs, and the windings are distributed windings. However, since the distributed windings need to be manually offline, the assembly efficiency of the motor is low.

[0004] Therefore, how to improve the assembly efficiency of the motor is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] An object of the present invention is to provide an armature winding assembly for a motor to improve the assembly efficiency of the motor. Another object of the present invention is to provide a motor comprising the above-mentioned armature winding assembly.

[0006] To achieve the above object, the present invention provides an armature winding assembly for a motor, comprising two sets of windings with the same number of pole pairs, and the windings are centralized windings.

[0007] Preferably, the ideal n value is calculated,

[0008] Calculate the difference in initial phase angle of each order harmonic

[0009] Where z is the number of motor slots, n1 is the ideal value of n, n is the number of slots between the two sets of windings; k is the harmonic order;

[0010] When n1 is an integer, When the fundamental wave magnetic flux density phase angle difference is not 180°, n is n1, and the fundamental wave attenuation is not higher than 10%.

[0011] When n1 is an integer, When the fundamental wave magnetic flux density phase angle difference is 180 degrees, n takes an integer value adjacent to n1, and the fundamental wave weakening is not higher than 10%;

[0012] When n1 is a non-integer, n takes an integer value adjacent to n1, and the fundamental wave is weakened by no more than 10%.

[0013] Preferably, when the motor is a 12-slot 10-pole motor, the two sets of windings are spaced 7 slots or 5 slots apart.

[0014] Preferably, when the motor is an 18-slot 10-pole motor, the two sets of windings are spaced apart by 8 slots or 10 slots.

[0015] Preferably, when the motor is an 18-slot 14-pole motor, the two sets of windings are spaced 8 slots or 10 slots apart.

[0016] Preferably, when the motor is a 20-slot 18-pole motor, the two sets of windings are separated by 9 slots or 11 slots.

[0017] Preferably, when the motor is an 18-slot 8-pole motor, the two sets of windings are separated by 9 slots.

[0018] Preferably, k is 1.

[0019] Preferably, k≥2.

[0020] A motor includes an armature winding assembly, wherein the armature winding assembly is any one of the armature winding assemblies described above.

[0021] In the above technical solution, the armature winding assembly of the motor provided by the present invention includes two sets of windings with the same number of pole pairs, and the windings are centralized windings.

[0022] From the above description, it can be seen that in the armature winding assembly provided in this application, the winding is set as two sets, and the winding is a centralized winding, which can be directly assembled on the stator after the early coil is formed, thereby improving the assembly efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the flow of current in the conductors of a conventional armature winding assembly;

[0025] Figure 2 A schematic diagram of the flow of current in the conductors of a conventional armature winding assembly having two sets of windings;

[0026] Figure 3 A schematic diagram of the flow direction of the conductor current of the two sets of windings provided in an embodiment of the present invention;

[0027] Figure 4A schematic structural diagram of a single winding unit provided by an embodiment of the present invention;

[0028] Figure 5 A schematic structural diagram of a stator provided in an embodiment of the present invention;

[0029] Figure 6 A schematic structural diagram of a winding unit arranged on a stator provided in an embodiment of the present invention;

[0030] Figure 7 A schematic structural diagram of two winding units arranged on a stator according to an embodiment of the present invention;

[0031] Figure 8 A schematic structural diagram of three winding units arranged on a stator according to an embodiment of the present invention;

[0032] Figure 9 A schematic diagram of a structure in which four winding units are arranged on a stator according to an embodiment of the present invention;

[0033] Figure 10 A schematic structural diagram of a stator with five winding units arranged on it according to an embodiment of the present invention;

[0034] Figure 11 A schematic diagram of a structure in which six winding units are arranged on a stator according to an embodiment of the present invention;

[0035] Figure 12 This is a comparison diagram of the amplitude of the spatial order of the armature winding assembly of the present invention and the traditional armature winding assembly.

[0036] in Figure 4-11 Middle: 1-winding unit, 2-stator core. DETAILED DESCRIPTION

[0037] The core of the present invention is to provide an armature winding assembly for a motor to improve the assembly efficiency of the motor. Another object of the present invention is to provide a motor comprising the above-mentioned armature winding assembly.

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and implementation methods.

[0039] Please refer to Figures 1 to 12 .

[0040] In one embodiment, the armature winding assembly of the motor provided by the present invention includes two sets of concentrated windings with the same number of pole pairs. Since the two sets of windings have the same structure, the amplitudes of the harmonic components generated by the same current are the same.

[0041] From the above description, it can be seen that in the armature winding assembly provided in the specific embodiment of the present application, the winding is set as two sets, and the winding is a centralized winding, which can be directly assembled on the stator after the early coil is formed, thereby improving the assembly efficiency of the motor.

[0042] In one embodiment, the ideal n value is first calculated.

[0043] Calculate the difference in initial phase angle of each order harmonic

[0044] Where z is the number of motor slots, n1 is the ideal value of n, n is the number of slots between the two sets of windings; k is the harmonic order;

[0045] When n1 is an integer, When the fundamental wave magnetic flux density phase angle difference is not 180°, n is n1, and the fundamental wave attenuation is not higher than 10%.

[0046] When n1 is an integer, When the fundamental wave magnetic flux density phase angle difference is 180 degrees, n takes an integer value adjacent to n1, and the fundamental wave weakening is not higher than 10%;

[0047] When n1 is a non-integer, n takes an integer value adjacent to n1, and the fundamental wave is weakened by no more than 10%.

[0048] This application divides the winding into two sets and adjusts the space angle between the two to effectively weaken the amplitude of the main harmonics. For the k-order harmonic, adjust the value of n so that Adjusting close to 180° can achieve the purpose of weakening the k-order harmonics, while ensuring that the fundamental wave is not significantly weakened.

[0049] Based on the number of slots and poles of the motor, the fractional slot concentrated winding is designed, the position of each phase coil in the stator slot and the corresponding polarity of the wire (the direction of current flow) are determined, and the number of turns n of each coil is determined, where n is an even number. Figure 3 This is a conventional design for fractional-slot concentrated windings in a 12-slot, 10-pole motor. The "+" and "-" in the figure indicate the direction of current flow. Specifically, for a 12-slot, 10-pole motor, the two sets of windings are separated by 7 or 5 slots.

[0050] During calculations, the second winding is rotated by a certain number of slots based on the harmonic order to be optimized. For a 12-slot, 10-pole motor, the armature field harmonics that most significantly impact motor performance are the first-order harmonics. Rotating the second winding by seven slots creates a 210° phase difference between the first-order harmonics generated by the two windings. Because the phase angle approaches 180°, the amplitude of the synthesized first-order harmonic is effectively reduced. The fundamental (fifth-order) phase angle difference is now 30°, slightly lower than before the shift.

[0051] For motors with different pole-slot ratios, the number of offset slots in the second set of windings should be designed according to the actual situation. The specific requirement is that the fundamental amplitude after the offset can meet the minimum design value. Preferably, the fundamental wave weakening is no more than 10%, and the target harmonic amplitude can be greatly weakened. However, n may not be an integer or taking an ideal value for n may cause the fundamental wave to be severely weakened. In this case, the value should be close to the ideal value of n. For example, for a 12-slot 10-pole motor, the first-order harmonic has a greater impact on the performance of the motor and needs to be weakened. At this time, the ideal value of n is 6, but when n is 6, the initial phase angle of the fundamental wave (fifth-order harmonic) magnetic flux differs by 180° (the actual value is 900°. Since the angle is in 360-base, 180° and 900° are the same). The fundamental wave is completely weakened, and n needs to be adjusted. When n is 7, the initial phase angle of the first-order harmonic differs by 210°, and the initial phase angle of the fundamental wave differs by 30° (actually 750°). In this case, while the first-order harmonic is weakened, the fundamental wave is not weakened much, thus achieving the purpose of weakening the first-order harmonic. When n is 5, the same effect is achieved, which will not be repeated here.

[0052] Specifically, when the motor is an 18-slot 10-pole motor, the two sets of windings are separated by 8 slots or 10 slots.

[0053] Specifically, when the motor is an 18-slot 14-pole motor, the two sets of windings are separated by 8 slots or 10 slots.

[0054] Specifically, when the motor is a 20-slot 18-pole motor, the two sets of windings are separated by 9 slots or 11 slots.

[0055] Specifically, when the motor is an 18-slot 8-pole motor, the two sets of windings are separated by 9 slots.

[0056] Of course, in the specific implementation process, the number of slots between the two sets of windings is determined according to actual calculations based on the number of slots in the motor.

[0057] Specifically, k is 1.

[0058] In one specific embodiment, the conductors in two adjacent slots of each winding set form a coil, and the number of turns per coil is n / 2, where n is the total number of turns per slot. The coils of each phase winding are wound, with the conductors in two adjacent slots forming a coil. The coil winding direction is based on the design current flow. Coils of the same phase are connected to form a single-phase winding unit 1. Each coil has n / 2 turns, and each winding set consists of three winding units 1, for a total of two winding sets.

[0059] During the specific assembly, select a winding unit 1 as the A1 phase of the first set of windings and assemble it into the stator core 1, select a winding unit 1 as the C1 phase and assemble it into the stator core 1, and rotate C1 counterclockwise (or clockwise) by 4 slots relative to A1, and then select a winding unit 1 as the B1 phase and assemble it into the stator core 1, and rotate B1 counterclockwise (or clockwise) by 4 slots relative to C1.

[0060] Select a winding unit 1 as the A2 phase of the first winding set and install it in the stator core 1. A2 rotates counterclockwise (or clockwise) seven slots relative to A1. Select a winding unit 1 as C2 and install it in the stator core 1. C2 rotates counterclockwise (or clockwise) seven slots relative to C1. Select a winding unit 1 as B2 and install it in the stator core 1. B2 rotates counterclockwise (or clockwise) seven slots relative to B1. The corresponding schematics are shown below. To distinguish the first and second winding sets, the coils of the second winding set are slightly larger in the schematic, but in reality, they are identical.

[0061] The final winding diagram is as follows Figure 11 shown.

[0062] By flexibly configuring the positional relationship between the two sets of windings, this application can effectively weaken specific harmonics in the air gap magnetic field and improve the overall performance of the motor. At the same time, the armature winding assembly provided by this application can effectively reduce the first-order harmonic of the motor air gap magnetic flux density.

[0063] The present application provides a motor including an armature winding assembly, wherein the armature winding assembly is any of the above-mentioned armature winding assemblies. The above description describes the specific structure of the armature winding assembly. The present application includes the above-mentioned armature winding assembly and also has the above-mentioned technical effects.

[0064] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An armature winding assembly of a motor, characterized in that: The invention comprises two sets of windings with the same number of pole pairs, and the windings are centralized windings; Calculate the ideal n value, Calculate the difference in initial phase angle of each order harmonic Where z is the number of motor slots, n1 is the ideal value of n, n is the number of slots between the two sets of windings; k is the harmonic order; when n1 is an integer, When the fundamental wave magnetic flux phase angle difference is not 180°, n is n1, and the fundamental wave weakening is not higher than 10%; when n1 is an integer, When n1 is 180 degrees and the fundamental magnetic flux density phase angle difference is 180 degrees, n takes an integer value adjacent to n1, and the fundamental wave weakening is not higher than 10%; when n1 is a non-integer, n takes an integer value adjacent to n1, and the fundamental wave weakening is not higher than 10%.

2. The armature winding assembly of the motor according to claim 1, characterized in that When the motor is a 12-slot 10-pole motor, the two sets of windings are spaced 7 slots or 5 slots apart.

3. The armature winding assembly of the motor according to claim 1, characterized in that When the motor is an 18-slot 10-pole motor, the two sets of windings are spaced 8 slots or 10 slots apart.

4. The armature winding assembly of the motor according to claim 1, characterized in that When the motor is an 18-slot 14-pole motor, the two sets of windings are spaced 8 slots or 10 slots apart.

5. The armature winding assembly of the motor according to claim 1, characterized in that: When the motor is a 20-slot 18-pole motor, the two sets of windings are separated by 9 slots or 11 slots.

6. The armature winding assembly of the motor according to claim 1, characterized in that When the motor is an 18-slot 8-pole motor, the two sets of windings are separated by 9 slots.

7. The armature winding assembly of the motor according to claim 1, characterized in that k is 1.

8. The armature winding assembly of the motor according to claim 1, characterized in that k≥2。 9. A motor comprising an armature winding assembly, characterized in that: The armature winding assembly is the armature winding assembly according to any one of claims 1 to 8.

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