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Low-space harmonic single/double-layer winding radial flux five-phase permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and radial flux, which is applied to the shape/style/structure of synchronous motors with stationary armatures and rotating magnets, motors, and winding conductors. Problems such as large eddy current loss and large harmonic content of the magnet can achieve the effect of reducing harmonic content, reducing calorific value, and reducing eddy current loss

Active Publication Date: 2022-01-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the harmonic content in the magnetomotive force of the five-phase permanent magnet synchronous motor stator winding combined with the fractional slot concentrated winding is relatively large, especially the near-polar harmonic amplitude is relatively high and the relative rotor rotates asynchronously. The problem of large eddy current losses in the rotor permanent magnets provides a low space harmonic single-layer winding radial flux five-phase permanent magnet synchronous motor

Method used

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  • Low-space harmonic single/double-layer winding radial flux five-phase permanent magnet synchronous motor
  • Low-space harmonic single/double-layer winding radial flux five-phase permanent magnet synchronous motor
  • Low-space harmonic single/double-layer winding radial flux five-phase permanent magnet synchronous motor

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specific Embodiment approach 1

[0046] Specific implementation mode one: the following combination Figure 1-13 Describe this embodiment mode, the radial flux five-phase permanent magnet synchronous motor of low spatial harmonic single-layer winding described in this embodiment mode, it comprises casing (1), stator (2), rotor (3), rotating shaft (8 ), the stator (2) includes a stator core (4) and a single-layer hybrid winding (5), the rotor (3) includes a rotor core (7) and a permanent magnet (6), and the rotor (3) is arranged on a rotating shaft (8) , the stator (2) is arranged on the outside of the rotor (3) and the rotating shaft (8), the outer circular surface of the stator (2) is fixed on the inner circular surface of the casing (1), and the connection between the stator (2) and the rotor (3) There is an air gap between them, and the length of the air gap is L;

[0047] The stator is provided with 10 stator slot units along the circumference, see Figure 4 , clockwise are unit 1 to unit 10, each stato...

Embodiment 1

[0059] Embodiment 1. According to the limited conditions, select the coil pitch as γ value and ξ value: γ=15.75°, ξ=99°, then the angle λ between the double-layer winding slots 1 is 9°, the angle λ between the single-layer winding slot and the double-layer winding slot 2 is 6.75°, the left and right pairs of adjacent single-layer winding slots in each stator slot unit, the angle λ between the two single-layer winding slots of each pair 3 is 4.5°, the angle λ between the middle two adjacent single-layer winding slots in each stator slot unit 4 is 4.5°,

[0060] During normal operation, the five-phase windings of the motor pass through the current in the form of cosine as follows:

[0061]

[0062] Among them: i a i b i c i d and i e are the currents of A, B, C, D and E phase windings respectively;

[0063] ω e is the electrical angular velocity of the motor;

[0064] I m is the current amplitude.

[0065] Through two-dimensional finite element analysis, the synth...

Embodiment 2

[0071] Embodiment 2. According to the limited conditions, select the coil pitch as γ value and ξ value: γ=16°, ξ=100°, then the angle λ between the double-layer winding slots 1 is 8°, the angle λ between the single-layer winding slot and the double-layer winding slot 2 is 8°, the left and right pairs of adjacent single-layer winding slots in each stator slot unit, the angle λ between the two single-layer winding slots of each pair 3 is 4°, the angle λ between the middle two adjacent single-layer winding slots in each stator slot unit 4 is 4°,

[0072] During normal operation, the five-phase windings of the motor pass through the current in the form of cosine as follows:

[0073]

[0074] Among them: i a i b i c i d and i e are the currents of A, B, C, D and E phase windings respectively;

[0075] ω e is the electrical angular velocity of the motor;

[0076] I m is the current amplitude.

[0077] Through two-dimensional finite element analysis, the synthetic magn...

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Abstract

The invention discloses a low-space harmonic single / double-layer winding radial flux five-phase permanent magnet synchronous motor, belongs to the field of motors, and aims to solve the problem that the harmonic content in magnetomotive force synthesized by a stator winding of a five-phase permanent magnet synchronous motor adopting a fractional slot concentrated winding is relatively large. The motor comprises a stator and a rotor, the stator is coaxially arranged outside the rotor, the stator is provided with ten stator slot units in the circumferential direction, the winding modes of five-phase windings are the same, and the phase differences of the B-phase winding, the C-phase winding, the D-phase winding and the E-phase winding are 72 degrees, 144 degrees, 216 degrees and 288 degrees in sequence relative to the A-phase winding in the spatial position; each phase of winding comprises two groups of coils, the space position difference of two pairs of coils in each group is 180 degrees, each pair of coils is arranged in one double-layer winding groove and two single-layer winding grooves in the two sides, the winding directions of the two coils in each pair are opposite, and the coil pitch is gamma; the two coils are connected in series to form a winding; and an included angle xi value and a coil pitch gamma value of the two groups of coils in the spatial position are limited so as to weaken the amplitude of near-pole sub-harmonics in the synthesized magnetomotive force.

Description

technical field [0001] The invention relates to a low-order harmonic suppression technology, which belongs to the field of motors. Background technique [0002] The five-phase permanent magnet synchronous motor system inherits the advantages of high power density, high torque density, high power factor and high efficiency of the traditional three-phase permanent magnet synchronous motor system. With stronger fault-tolerant operation capability and more control degrees of freedom, it has broad application prospects in aerospace, multi-electric aircraft, electric vehicles and ship propulsion, which require high equipment reliability. However, the stator windings of the five-phase permanent magnet synchronous motor with fractional slot concentrated windings contain more harmonics in the magnetomotive force, and the non-working harmonics rotate asynchronously with respect to the rotor, so eddy currents are induced in the permanent magnets of the rotor, especially For the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/14H02K1/16H02K3/12H02K3/28H02K1/27
CPCH02K21/14H02K1/16H02K3/12H02K3/28H02K1/276H02K1/278H02K2213/03Y02T10/64
Inventor 郑萍黄家萱隋义尹佐生杨士杰
Owner HARBIN INST OF TECH
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