A full speed range position detection method based on built-in permanent magnet synchronous motor

Abstract

The invention provides a method for detecting position in full speed range based on a built-in type permanent magnet synchronous motor. The method comprises the following steps of comparing the given rotation speed n<*> and the feedback predicting rotation speed (which is shown in the description), and using a PI (proportional-integral) speed regulator to obtain the given current i<*>q of q axis; respectively comparing the given current i<*>q and i<*>d of the dq axis and the feedback current idq of the dq axis, and utilizing a PI current regulator to obtain the voltage vdq of the dq axis; performing park reverse conversion, so as to obtain two-phase static voltage v(alpha beta), and inputting into a SVPWM (space vector pulse width modulator) to control the connecting and disconnecting of an inverter, so as to control the built-in type permanent magnet motor. The method for detecting the position in the full speed range based on the built-in type permanent magnet synchronous motor has the advantages that a model reference self-adaptive method for medium and high-speed range detection is combined with a minimum voltage injection method for low-speed and zero-speed range detection, and the sensorless system control in the full speed range is realized.

Description

technical field [0001] The invention relates to the technical field of AC speed regulation, and more specifically, relates to a full-speed range position detection method based on a built-in permanent magnet synchronous motor. Background technique [0002] With the rapid development of permanent magnet materials, power electronics technology and motor control theory, permanent magnet synchronous motors have been increasingly widely used in CNC machine tools, industrial robots, aerospace, electric vehicles and other fields due to their superior performance and firmness. . [0003] Permanent magnet synchronous motors are widely used in AC variable speed drives because they do not require excitation current and have high operating efficiency, torque-to-inertia ratio, and power density. However, their high-performance control requires precise rotor position and speed signals to achieve magnetic field orientation. In traditional motion control systems, photoelectric encoders or...

AI Technical Summary

Problems solved by technology

[0004] The current position sensorless technology has some shortcomings in the field of AC speed regulation. The research on the position sensorless control technology of permanent magnet synchronous motors has achieved fruitful results, but most of them rely on the analysis of the fundamental wave equation of the motor, which is not suitable for low speed and It is applied at zero speed and is very sensitive to the parameters of the motor

For example, methods such as sliding mode observer, model reference adaptive, back EMF and Kalman filter are suitable for medium and high speeds, but not suitable for low speed and zero speed range.

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