异步电机高性能控制系统励磁电感的准确测量

Precise measurements of magnetic inductance in asynchronous motors for high performance applications

高性能异步电机控制系统中需要准确测量电机各参数。提出了一种在不卸掉电机负载的情况下准确测量励磁电感的方法,解决了高性能控制中需要电机空载测量励磁电感而又不便卸去负载的矛盾。该方法在恒磁通控制下的准稳态减速过程中获取理想空载实验条件,并根据测量数据计算出励磁电感。测量过程中电机磁通在额定值附近,不受摩擦转矩的影响,电压电流为正弦波并有足够的幅值,保证了测量准确性。文中对其原理、实现方法进行了论述,并且给出了适用条件。仿真和实验表明:该方法在适用范围内和稳态实验结果接近,达到了误差小于1%的测量精度。

A method was developed to measure the magnetic inductance in an asynchronous motor while the mechanical load is still attached to the motor. The measurements are made as the motor speed is decreasing to quasi steady state so that the magnetic inductance is precisely calculated at no load conditions and nominal flux. The principle and methodology are given in detail with the applicable conditions. All the algorithms have been implemented on a real inverter system with the test results and simulation results both verifying the validity and feasibility of the method. The measure error is less than one percent.