Fractional slot single and double-layer lap winding for servo permanent magnet synchronous motor

Abstract

The invention relates to a fractional slot single and double-layer lap winding structure of a servo permanent magnet synchronous motor, which is characterized in that a stator slot comprises 30 slots, 8 poles and 3 phases, wherein the number of slots of per pole per phase is 5 / 4; the stator winding is designed into a single and double-layer lap winding; each phase comprises 8 coils, the pitch of each coil is 4, wherein the number of turns of each of 4 coils is n; the number of turns of the rest 4 coils is 2n; the ratio of numbers of turns of the two types of coils is 1:2; all opening coils ofthe 8 coils are connected in series, and the 3 phases are symmetrically distributed to form the single and double layer lap winding; 10 slots of the 30 slots are single lap windings, the rest 20 slots are double-layer lap windings, the 30 slots of a stator punching corresponding to the stator slots are composed of two types of slots, wherein the number of larger slots is 12 and the number of small slots is 18. Compared with the traditional lap winding, the fundamental wave winding coefficient of the special fractional slot single and double layer lap winding is improved by 0.75%, while the magnetic potential harmonic wave is reduced by 60.3%; and the inserting winding process for coil manufacturing is totally the same as that of the traditional lap winding, thereby reducing the vibration,noise and temperature rising of a motor traditionally designed and improving the efficiency and the torque.

Description

technical field [0001] The invention relates to a motor winding, in particular to a fractional-slot single-layer and double-layer stacked winding of a servo permanent magnet synchronous motor. Background technique [0002] Servo permanent magnet synchronous motors generally have low power and small size. The number of poles is mostly 6 poles, 8 poles, and 10 poles. The number of slots is small, so the number of slots per pole and phase is mostly fractional. Short slot design, such as 3-phase, 8-pole and 30-slot motor, the number of slots per pole and phase is 5 / 4, generally designed according to the span of 1-4, that is, short-distance? = 4 / 5 double-stacked three-phase windings, The 5th harmonic of this winding is weakened, but the 7th, 11th, and 13th harmonics are large, and the magnetic potential harmonics are large during frequency conversion and speed regulation, and the sine of the magnetic potential is poor, the motor vibration noise is large, and the harmonic iron lo...

AI Technical Summary

Problems solved by technology

[0002] Servo permanent magnet synchronous motors generally have low power and small size. The number of poles is mostly 6 poles, 8 poles, and 10 poles. The number of slots is small, so the number of slots per pole and phase is mostly fractional. Short slot design, such as 3-phase, 8-pole and 30-slot motor, the number of slots per pole and phase is 5 / 4, generally designed according to the span of 1-4, that is, short-distance? = 4 / 5 double-stacked three-phase windings, The 5th harmonic of this winding is weakened, but the 7th, 11th, and 13th harmonics are large, and the magnetic potential harmonics are large during frequency conversion and speed regulation, and the sine of the magnetic potential is poor, the motor vibration noise is large, and the harmonic iron loss Large, high temperature, small torque, this situation is expected to be improved through the new design of the winding

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