Torque analysis method of synchronous reluctance motor considering magnetic saturation

Abstract

The invention discloses a torque analysis method of a synchronous reluctance motor considering magnetic saturation. The method comprises the following steps of: 1, calculating air gap flux density; concretely, calculating through a winding function, stator magnetomotive force, stator slotting and a rotor structure to obtain air gap flux density without considering magnetic saturation; 2, for the magnetic saturation of the stator core, calculating a saturation factor of each stator tooth part by adopting an iteration method, and calculating the air gap flux density considering the magnetic saturation according to the saturation factor and the air gap flux density not considering the saturation; and 3, calculating the torque, concretely calculating the reluctance torque through the stator magnetomotive force, the rotor magnetomotive force and the air gap flux density considering magnetic saturation. According to the method, the torque of the offset asymmetric synchronous reluctance motor considering stator tooth saturation is analyzed for the first time, and the scheme can be expanded to other motors.

Description

technical field [0001] The invention relates to an analysis method of synchronous reluctance motor torque considering magnetic saturation, belonging to the field of electromagnetic field calculation. Background technique [0002] Synchronous reluctance motors have been widely used due to their low cost, wide flux weakening capability, and high fault tolerance. However, the main disadvantage of synchronous reluctance motors is high torque ripple. Therefore, on the premise of solving the high torque ripple of the synchronous reluctance motor, it is of great practical significance to obtain a torque waveform with high accuracy. Among the more common torque prediction methods, the analytical method has obvious advantages due to the large amount of calculation and the time-consuming problems of the finite element software. [0003] At present, the commonly used analytical methods mainly include: Maxwell stress tensor method, winding function theory and Lorentz force law. A subd...

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Problems solved by technology

However, both methods are computationally intensive, and they are mainly applied to permanent magnet motors; semi-numerical methods can calculate the harmonic torque components in synchronous reluctance motors, but the radial and tangential air-gap flux densities are Obtained by finite element software; the winding function theory uses the relevant parameters of the motor to calculate the inductance matrix, and calculates the instantaneous torque through the energy formula, but in this method, the magnetic permeability of the stator and rotor is set to infinity

Therefore, when the synchronous reluctance motor stator teeth are saturated, the result of this method is much larger than the actual value; the Lorentz force law method takes into account the saturation of the stator and rotor, and through this method, the air gap magnetic flux density can be correctly calculated, In order to obtain high-precision torque, however, this method is only suitable for synchronous reluctance motors with symmetrical structures

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