Harmonic wave reducing method of permanent-magnetic fault tolerance motor

Abstract

The invention discloses a harmonic wave reducing method of a permanent-magnetic fault tolerance motor. The method comprises reduction of sine harmonic waves, reduction of sine and third harmonic waves, reduction of arc cosine harmonic waves and reduction of arc cosine and third harmonic waves, harmonic wave reduction is applied to a stator or rotor independently, or harmonic wave reduction is applied to both the stator and rotor at the same time by combining different methods, and the performance of the motor is improved. The method can be applied to an iron core portion of the rotor or stator as well as to a permanent magnet portion of the rotor or stator. When the harmonic wave reducing method is applied to the permanent-magnetic fault tolerance motor, the air-gap flux density and the sine degree of counter-electromotive force waves can be effectively improved, the content of different sub-harmonic waves is reduced, and the whole torque ripples are reduced; and the operation stability of the motor is enhanced, and noises and vibration are reduced.

Description

technical field [0001] The invention relates to a permanent magnet fault-tolerant motor, in particular to a harmonic cutting method for a permanent magnet fault-tolerant motor, and belongs to the technical field of novel motor manufacturing. Background technique [0002] Nowadays, permanent magnet motors have been widely used, and they play a very important role in many fields from automobiles to aerospace. This is mainly due to several salient features of permanent magnet motors, including high torque density, high efficiency, and small weight and volume. The permanent magnet motor replaces the traditional excitation winding with high magnetic energy product magnetic material, which not only eliminates the negative impact of the excitation winding, but also simplifies the mechanical structure of the motor, improves the reliability of the motor operation, and reduces the mechanical loss accordingly. Small. [0003] Although permanent magnet motors have a series of advantag...

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Problems solved by technology

[0007] (3) Thermal isolation: each slot has only a single phase winding, and there is no direct contact between the phase windings; therefore, when a short circuit occurs in one phase winding, the heat generated is rarely or not transferred to other phases, affecting Insulation to other phases

However, these methods have a disadvantage, that is, the average torque of the motor will decrease with the reduction of torque ripple, that is to say, torque ripple and average torque are two performance indicators that constrain each other.

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