Method for calibrating parameters of motor controller without position sensor

Abstract

The invention discloses a method for calibrating parameters of a motor controller without a position sensor. The second step of the method includes connecting a first insulated gate bipolar transistor, a fourth insulated gate bipolar transistor, a first resistor and a motor with a power supply in series, conducting pulse width modulation pulse to the first insulated gate bipolar transistor and a second insulated gate bipolar transistor, keeping the lower arm of the second insulated gate bipolar transistor unobstructed so that voltage input at two ends of the motor is product of direct-current bus voltage U and pulse width modulation duty ratio D, testing the first resistor to obtain the value of current I, calculating end resistance of the motor by the U and the I, and dividing the end resistance to calculate stator resistance Rs. The calculation method is shown as follow. By the method for calibrating parameters of the motor controller without the position sensor, topological structure of an inverter of the motor controller cannot be changed.

Description

Technical field: [0001] The invention relates to the technical field of motor automatic control, in particular to a method for calibrating parameters of a position sensorless motor controller. Background technique: [0002] In recent years, with the rapid development of power electronics technology, microelectronics technology, new motor control theory and rare earth permanent magnet materials, permanent magnet synchronous motors have been rapidly popularized and applied. They have the advantages of small size, low loss and high efficiency. Today, energy and environmental protection are getting more and more attention, so it is very necessary to research and control them. For the control of permanent magnet synchronous motors, there are mainly constant voltage-frequency ratio control, vector control and direct torque control. Among them, vector control is the most widely used. The basic idea of ​​vector control is: in the ordinary three-phase AC The control law of DC motor ...

AI Technical Summary

Problems solved by technology

Since F. Blaschke of Siemens Corporation in Germany proposed the vector control method in 1971, this control method has been favored. However, although it solves the control problems caused by the nonlinearity of PMSM or the strong coupling of torque and flux linkage, it is not Because the parameters of the permanent magnet synchronous motor are time-varying, which limits its performance improvement in the servo system, the best way to solve this problem is to sample the permanent magnet synchronous motor in real time, and then use the sampled parameters to The motor controller is adjusted accordingly to improve the performance of the permanent magnet synchronous motor in the servo system

[0003] The motor controller parameter calibration method in the prior art is often to add additional circuits. Although the motor control system using this method can effectively solve the problem of unidentifiable parameters, the following problems still exist: due to the need to add additional circuits, especially Various sensors will change the topology of the inverter in the motor controller, making the motor control system more cumbersome

Images