Three phase AC motor with less wave form distortion ratio and high efficiency

Abstract

This invention relates to a continuous rotating type ac electric motor, particularly three phase, low wave form distortion, high efficiency ac electric motor being composed of a rotor and a stator. The stator comprises: a seat, a stator core and stator winding each of the three phase stator winding occupies one layer of stator core channel. On the cross-section of the stator core, the corresponding end points of three-layer winding are of 120 deg. intervals. This invention breaks-through prior art mode of single layer or double layers of stator winding of three-phase motor, so it can eliminating distortion wave form of three phase electric motor, the distortion rate is less than 2%. The efficiency of electric generation is greater than 95%, while the efficiency of electric motor is greater than 90%.

Description

technical field [0001] The invention relates to a continuously rotating AC motor, in particular to a three-phase AC motor with small waveform distortion rate and high efficiency. Background technique [0002] For various types of three-phase AC motors including generators and motors, the structure is composed of a stator and a rotor. The stator is fixed with a stator core on the frame, and a three-phase stator winding is arranged in the stator core. Conventional stator winding structures include concentric, cross, and chain, and special stator windings include fractional windings and sinusoidal windings. Conventional stator windings, because the armature magnetic field cannot be in a sinusoidal state, lead to a high voltage waveform distortion rate (up to 30%). Due to the large harmonic content of this winding, the vibration and internal consumption of the motor are increased, and the efficiency of the motor is reduced. The efficiency of the motor is generally less than 80%...

AI Technical Summary

Problems solved by technology

Conventional stator windings, because the armature magnetic field cannot be sinusoidal, resulting in a high voltage waveform distortion rate (up to 30%)

Due to the large harmonic content of this winding, the vibration and internal consumption of the motor are increased, and the efficiency of the motor is reduced. The efficiency of the motor is generally less than 80%.

As for the special stator winding, although it has a certain inhibitory effect on high-order harmonics due to its special structure and improves the performance of electrical parameters, its winding process is complicated and its production cost is high. The reduction of the conventional winding is a lot, so its power per unit volume is low, resulting in a large volume and high weight of the motor, so it is rarely used

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