Construction Method of Suspension System Based on Parameter Observation of Bearingless Synchronous Reluctance Motor

Abstract

The invention discloses a suspension system construction method for parameter observation of a non-bearing synchronous reluctance motor. The method comprises: constructing a motor parameter observation system; detecting three-phase currents and voltages of a motor suspension winding and transmitting the three-phase currents and voltages into the input terminal of the motor parameter observation system; detecting the three-phase currents and voltages of the motor torque winding, sending the three-phase currents and voltages into an extended flux linkage estimation model, outputting a flux linkage observation value under a two-phase synchronous rotation coordinate by the extended flux linkage estimation model, and using the flux linkage observation value as one of input signals of an extended suspension force / current transformer; constructing the suspension force / current transformer and outputting a two-phase current reference value of a motor suspension winding by the extended suspension force / current transformer as an input signal of an extended hysteresis current inverter, providing power for the motor suspension winding by the hysteresis current inverter, generating an expected suspension force, and realizing `rotor displacement and inductance parameter observation of a controller motor under a non-displacement sensor. The constructed suspension system has advantages of quickresponse and excellent performance.

Description

technical field [0001] The invention relates to the technical field of AC motor control, in particular to a construction method of a bearingless synchronous reluctance motor suspension system based on motor parameter observation, which is suitable for the suspension operation of a bearingless synchronous reluctance motor without a displacement sensor under high-speed conditions. Background technique [0002] The bearingless synchronous reluctance motor is a set of suspension windings superimposed on the basis of the torque winding in the stator slot of the ordinary synchronous reluctance motor, which is used to generate a radial suspension force that supports the stable suspension of the rotor, and controls the current of the two sets of windings of the motor. It can control the speed of the motor and the suspension of the rotor at the same time. The bearingless synchronous reluctance motor has outstanding high quality: low noise, low power consumption, high speed, no lubric...

AI Technical Summary

Problems solved by technology

[0003] In order to realize the stable suspension of the rotor of the bearingless synchronous reluctance motor, the radial displacement of the rotor must be detected and closed-loop controlled. The sensor brings defects such as increased motor size, reduced motor reliability, and increased manufacturing costs.

A national invention patent (Patent No.: ZL201010583419.6) has been published on the rotor displacement soft measurement and suspension system construction method of the bearingless synchronous reluctance motor, but the accuracy of the rotor displacement detection method described in the patent is not good. High, completely dependent on the flux linkage identification accuracy of the motor suspension winding

Another national invention patent (patent number: ZL201010017952.6) on the control method of bearingless synchronous reluctance motor without displacement sensor, but the high-order harmonic current injected into the torque winding of the motor in this method will affect the suspension accuracy of the rotor, increasing Torque ripple of large motors, and the method algorithm is complex

[0004] On the other hand, the levitation force of the bearingless synchronous reluctance motor and the inherent d-q axis inductance parameter L of the motor torque winding itself d , L q Closely related, the parameter L in the actual operation of the motor d , L q It is easy to change due to factors such as magnetic saturation, and is not a fixed constant, which greatly affects the rotor suspension control accuracy under the condition of motor load

Therefore, it is necessary to observe the inductance parameters of the motor in real time. At present, there are no relevant patents and documents related to this issue.

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