Gyro permanent magnet synchronous motor sensorless control system

Abstract

The invention provides a gyro permanent magnet synchronous motor sensorless control system which comprises a speed loop and a current loop. The speed loop comprises a phase locked loop II, a frequency division module, a back EMF zero crossing comparison circuit, and a back EMF extraction circuit. The current loop comprises a phase locked loop I, a sine wave current generator, a current controller, a linear power amplification circuit, and a current detection circuit. The back EMF extraction circuit generates an opposite potential extraction circuit. The back EMF zero crossing comparison circuit generates a zero crossing pulse signal. The frequency division module carries out frequency division to obtain a mechanical frequency square wave signal. The phase locked loop II generates sine wave current generator amplitude setting. The phase locked loop I generates sine wave current generator frequency setting. The sine wave current generator generates the setting sine current of the current loop. The current detection circuit collects a phase current signal. The current controller obtains an operation result, amplifies the operation result, and sends the result to an external gyro permanent magnet synchronous motor, and the motor driving control is completed.

Description

technical field [0001] The invention relates to a control system of a permanent magnet synchronous motor, in particular to a sensorless control system of a gyro permanent magnet synchronous motor. Background technique [0002] The high-precision three-floating gyro replaces the hysteresis motor with a permanent magnet motor, which improves the stability of the motor speed, reduces the power loss of the motor, and improves the accuracy of the gyro. Permanent magnet motors generally need a set of rotor position sensors, such as gratings, resolvers, etc., to achieve commutation, but due to the limitations of the motor leads and the volume of the gyro space, gyro permanent magnet motors cannot be equipped with position sensors, so domestic and foreign gyro permanent magnets The motor generally adopts a position sensorless control method. [0003] Most of the existing gyro permanent magnet motors use brushless DC motors. The main reason is that the drive control method is simple...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the deficiencies in the prior art and provide a sensorless control system for gyro permanent magnet synchronous motors, aiming at the existing sensorless control methods of permanent magnet synchronous motors that are complicated and the stability of the motor speed is not high Disadvantages, by adopting the double closed-loop control composed of speed closed loop and current closed loop, the frequency multiplication of the back EMF zero-crossing pulse signal is performed to generate the frequency setting of the sine wave current generator, and the speed difference between the actual speed of the motor and the reference speed is used as the sinusoidal current amplitude The value is given, and the sinusoidal current and the opposite potential signal are phase-locked to maximize the efficiency of the gyro permanent magnet synchronous motor. speed stability

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