39-groove 12-pole three-phase permanent magnet synchronous motor six-layer-set lap winding embedding and connecting method

Abstract

The invention discloses a 39-groove 12-pole three-phase permanent magnet synchronous motor six-layer lap winding embedding and connecting method. All coils are continuously embedded and connected according to a specific sequence according to the method so as to obtain six-layer three-phase double-layer short-pitch distribution lap winding group with each phase being only a parallel branch. Each coil pitch of the six-layer three-phase double-layer short-pitch distribution lap winding group is 3 grooves; each layer is a three-phase double-layer short-pitch distribution lap winding group formed by connected according to a specific manner; each phase winding of the three-phase double-layer short-pitch distribution lap winding group in each layer is formed by serially connecting 13 coils; eachphase winding of a motor is formed by serially connecting 78 coils. The fundamental wave electrodynamic potential amplitudes of the three-phase double-layer short-pitch distribution lap winding groupsin the layers are close, the phase difference is close to 120 degrees, the fundamental wave electrodynamic potential phase difference of the same phase windings in the layers are a little different,the total fundamental wave electrodynamic potential amplitude of the three-phase windings is close, the phase difference is close to 120 degrees, the waveform is good, a three-phase Y-connection winding is approximately symmetric, and the end part of a stator winding is short.

Description

technical field [0001] The invention belongs to the field of electrical engineering, and relates to a method for embedding and connecting six-layer nested windings suitable for a 39-slot, 12-pole, three-phase permanent magnet synchronous motor. Background technique [0002] In many applications, limited by the space and the characteristics of the driven load, high requirements are placed on the volume and weight of the permanent magnet synchronous motor. At this time, in order to achieve the purpose of reducing space, the axial length of the end of the stator winding is designed to be as short as possible; in order to reduce the thickness of the iron core of the stator and rotor yoke and reduce weight, the number of pole pairs of the motor is selected more. [0003] Although the axial length of the end of the fractional slot concentrated winding is very short, the fractional slot concentrated winding armature reaction magnetomotive force harmonic component is very rich, and ...

AI Technical Summary

Problems solved by technology

[0003] Although the axial length of the end of the fractional slot concentrated winding is very short, the fractional slot concentrated winding armature reaction magnetomotive force harmonic component is very rich, and the amplitude is high; when the motor speed is high, the permanent magnet rotor with surface mount structure High eddy current and hysteresis loss will be generated on the permanent magnet, resulting in low efficiency of the motor, and even demagnetization of the permanent magnet in severe cases

[0004] At this time, the number of slots occupied by each pole and each phase can be divided into fractional slots, such as 39 slots and 12 poles. For 39 slots and 12 poles, if the three-phase winding is divided according to the traditional 60° phase band phase separation method Phase separation, the obtained three-phase winding has poor symmetry; the axial length of the winding end is relatively long; and there are many harmonics of the permanent magnet electromotive force. Ensure that the axial length of the end of the stator winding is very short, and the three-phase winding is as symmetrical as possible

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