Bearingless asynchronous motor direct suspension force control method based on model prediction

Abstract

The invention discloses a bearingless asynchronous motor direct suspension force control method based on model prediction. The method comprises the following steps: obtaining radial suspension force amplitude and phase xi after PID adjustment and polar coordinate conversion of difference values of displacement signals x and y and given displacement signals x* and y* through suspension control; calculating synthesis air gap flux linkage psi 1m and phase eta through torque winding flux observer and vectorial resultant of three-phase current; inputting radical suspension force amplitude and phase xi, air gap flux linkage psi and phase eta into a suspension force calculating module, carrying out rectangular coordinate conversion treatment to obtain a suspension winding flux linkage reference value, screening a difference value with a suspension winding flux linkage reference value at the next moment through a target function to obtain a flux linkage in an optimal switch state, obtaining the voltage signal of a drive inverter after SVPWM modulation of the flux linkage, and finally obtaining three-phase voltage required for a control motor so as to realize bearingless asynchronous motor direct suspension force control. The method can solve the problem that precision is insufficient and is greatly influenced by motor parameters caused by traditional suspension force indirect control.

Description

technical field [0001] The invention belongs to the technical field of electric drive control, and in particular relates to a method for directly controlling the suspension force of a bearingless asynchronous motor based on model prediction. Background technique [0002] In recent years, with social development and scientific and technological progress, the market needs more and more motors to be put into use, and the requirements for motor performance are also getting higher and higher. Traditional motors will produce a series of problems such as mechanical friction and noise during operation. These problems directly lead to poor operating performance and short service life of the motor, and also limit its development in the high-speed and ultra-high-speed fields. Therefore, motors with high-speed and high-performance characteristics are favored. Bearingless asynchronous motors not only have the advantages of traditional motors, but also have the advantages of no lubricati...

AI Technical Summary

Problems solved by technology

[0003] With the maturity of the motor control technology, the control technology of the bearingless asynchronous motor is also continuously improved. The control of the bearingless asynchronous motor is mainly divided into two parts, which are the control of the torque and the suspension. The control methods include neural network, sliding mode control, sensorless control, etc. At present, the excellent control of bearingless asynchronous motors is mainly concentrated in the torque part, and the control method for the suspension part is still in an embryonic state, generally Using the method of levitation force control, the levitation force control of the traditional bearingless asynchronous motor is realized through vector control. This control method is greatly affected by the motor parameters and finally controls the levitation force through the generated levitation winding current, which is An indirect control, the precision control of the radial suspension force is not ideal, so the precise control of the suspension force has become a research hotspot

Images