A sensorless speed measurement method for permanent magnet synchronous motor based on fuzzy control and mras

Abstract

The invention discloses a permanent magnet synchronous motor speed-sensor-free speed measuring method based on fuzzy control and an MRAS. The method is used for position and speed detection of a motor. In the actual running process, according to model reference adaptive control, the actual running condition of the motor serves as a reference model, a motor model containing to-be-estimated rotating speed, current and other parameters serves as an adjustable model, an equation not containing unknown parameters serves as a reference model, the two models have the same output quantity in physical significance, the output value of the reference model serves as ideal response, the two selected models both output current values, the adjustable model is adjusted through the difference between actually measured current and estimated current of the motor, the actual value is tracked through the estimated value, the output difference between the two models approaches zero, and therefore the purpose that output of the reference model can be tracked through output of a control object, and then the motor runs stably is achieved.

Description

technical field [0001] The invention relates to the technical field of speed sensorless speed measurement, in particular to a speed sensorless speed measurement method of a permanent magnet synchronous motor based on fuzzy control and MRAS. Background technique [0002] In the motor speed detection process, mechanical sensors have many shortcomings that are difficult to solve. For example: in some special working environments (high temperature, high pressure), the accuracy of the information it provides is not trustworthy; at the same time, the use of mechanical sensors will increase the cost of the motor control system and make maintenance difficult. At the same time, because conventional PI controllers generally have a problem-integral saturation. The so-called integral saturation means that when the system has a deviation in one direction, the integral link of the PI controller continues to accumulate, and finally reaches the limit value of the controller. Even if the in...

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Problems solved by technology

However, during the desaturation time, the controller output is still at the limit value, and at this time, adjustment lag is prone to occur, resulting in poor system performance

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