Electromagnetic noise simulation calculation method for permanent magnet synchronous motor under acceleration condition

Abstract

The invention provides an electromagnetic noise simulation calculation method for a permanent magnet synchronous motor under an acceleration working condition. The method includes obtaining a time domain electromagnetic force on a corresponding rotating speed two-dimensional stator in a steady state; obtaining a time domain electromagnetic force on the three-dimensional stator electromagnetic gridat a corresponding rotating speed at a steady-state rotating speed; obtaining a frequency domain electromagnetic force on the stator three-dimensional structure grid at a corresponding rotating speedat a steady-state rotating speed; obtaining the mode of the whole motor; obtaining a motor vibration response at the rotating speed through a modal superposition method; obtaining an electromagneticnoise sound pressure level at a corresponding rotating speed in a steady state by using a boundary element method; and constructing a matrix through the steady-state rotating speed data set and the electromagnetic noise radiation sound pressure level data set, and performing data processing on the electromagnetic noise radiation sound pressure level data set and the corresponding rotating speed data set in the steady state to obtain an electromagnetic radiation colomap of the permanent magnet synchronous motor under the acceleration working condition. The method provided by the invention is suitable for prediction of electromagnetic noise radiation and diagnosis of fault noise under the acceleration condition of the permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to a simulation calculation method of electromagnetic noise of a permanent magnet motor, in particular to a simulation calculation method of electromagnetic noise under the acceleration working condition of a permanent magnet synchronous motor. Background technique [0002] With the improvement of energy conservation and environmental protection awareness, there are more and more pure electric new energy vehicles. Permanent magnet synchronous motors are often used as drive motors for new energy vehicles because of their wide speed range and high torque efficiency. However, without the cover of traditional engine noise, the high-frequency electromagnetic noise of the motor will be more obvious in the cockpit, especially the howling sound generated by the motor under acceleration conditions, which is unacceptable to drivers and passengers and affects comfort. Electromagnetic force excites the stator to cause deformation of the stato...

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Problems solved by technology

[0003] Accurately obtaining the electromagnetic force on the stator under the acceleration condition is the premise of calculating the electromagnetic noise under the acceleration condition of the permanent magnet synchronous motor, but the technical means to obtain the electromagnetic force on the stator under the acceleration condition is not mature, so most of the current research The calculations are all electromagnetic noise radiation of permanent magnet synchronous motors under steady-state conditions, and the noise spectrum of permanent magnet synchronous motors under accelerated conditions cannot be obtained, which is not conducive to the evaluation of NVH performance of permanent magnet synchronous motors under various working conditions, and the failure of permanent magnet synchronous motors. diagnosis

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