Permanent magnet synchronous motor parameter identification method, device and control system

Abstract

The invention discloses a permanent magnet synchronous motor parameter identification method, which belongs to the technical field of synchronous motor parameter testing. A current or voltage pulse vector whose direction is the same as that of A-phase axis of a motor stator is inputted to the permanent magnet synchronous motor, a voltage excitation signal with a zero average voltage and containing a non-zero voltage pulse is inputted between the B phase and the C phase of the permanent magnet synchronous motor, and current of each phase of the permanent magnet synchronous motor during the process is sampled; according to three-phase current obtained through sampling in the case of steady three-phase current of the motor, the inputted current or voltage pulse vector and parameters of the excitation voltage signal are combined, and stator resistance, d-axis inductance and q-axis inductance of the permanent magnet synchronous motor are calculated and obtained. The invention also discloses a permanent magnet synchronous motor parameter identification device and a control system. Influences on d-axis and q-axis inductance measurement by d-axis positioning errors can be avoided, quickness of current sampling is not required, and measurement accuracy is better.

Description

technical field [0001] The invention discloses a parameter identification method of a permanent magnet synchronous motor, which belongs to the technical field of synchronous motor parameter testing. Background technique [0002] With the application of frequency conversion speed control technology in synchronous motors, the application range of synchronous motors is becoming more and more extensive. The commonly used high-performance frequency conversion speed control technology includes vector control technology without speed sensor and torque control technology. The control technology is based on the mathematical model of the synchronous motor, and it is necessary to obtain the parameters of the motor, such as: stator resistance, inductance of the AC and D axis, and flux coefficient. Here we mainly give a method to measure the inductance of the AC-D axis and the stator resistance. [0003] The traditional method of measuring the direct-axis and quadrature-axis inductance ...

AI Technical Summary

Problems solved by technology

Because this method cuts off the motor power supply after d-axis DC positioning, the motor is in a free state, and then applies d and q-axis fixed voltage pulses to the motor. Since the fixed pulse time is short and has no effect on d-axis positioning, the angle of DC positioning is easily affected by the motor. The friction and gravity on the mechanical axis change, which makes the d-axis positioning inaccurate and affects the accuracy of measuring inductance

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