Calculation method and system of weak magnetic performance of permanent magnet synchronous motor

Abstract

The invention discloses a calculation method and system of weak magnetic performance of a permanent magnet synchronous motor. The method comprises steps of establishing a transient field simulation model of a motor, and setting a three-phase excitation current of the model; according to a correspondence relationship of an electromagnetic torque, a stator current and a current control angle, performing parametric scanning on the current control angle, so as to obtain a torque control angle curve under a given stator current; selecting a control manner adaptive to condition of the motor for themotor according to motor rotating speed and motor type, so as to acquire an optimal current control angle meeting a constraint of the control manner under different motor rotating speeds; according toa torque control angle curve under the stator current corresponding to any optimal current control angle, acquiring an electromagnetic torque corresponding to the optimal current control angle, so asto obtain a torque-rotating speed correspondence relationship; according to the torque-rotating speed correspondence relationship, determining a highest motor rotating speed, and determining a weak magnetic expansion range of the motor according to a ratio of the highest motor rotating speed to a motor rated rotating speed. The method improves motor design efficiency.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motors, in particular to a method and system for calculating the magnetic field weakening performance of permanent magnet synchronous motors. Background technique [0002] With the development of high-performance permanent magnet materials, the performance of permanent magnet motors has been greatly improved, especially permanent magnet synchronous motors, which have gradually developed towards high speed, high torque and high power density. At present, the field-weakening speed expansion capability of the permanent magnet synchronous motor has a great influence on the overall performance of the motor, so the field-weakening speed expansion range of the permanent magnet synchronous motor should be calculated when designing the permanent magnet synchronous motor. In the prior art, the calculation method of the field-weakening speed expansion range of the commonly used permanent magnet sy...

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Problems solved by technology

However, the control system model of the permanent magnet synchronous motor is relatively complicated to build, which increases the difficulty of modeling and simulation and the time of simulation calculation, thereby reducing the efficiency of motor design

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