Bearing-free synchronous reluctance motor rotor displacement soft measurement and suspension system construction method

Abstract

The invention discloses a bearing-free synchronous reluctance motor rotor displacement soft measurement method, which comprises the following steps of: first establishing a back electromotive force model of a suspension winding of a motor, namely, performing coordinate transformation on three-phase detection current and voltage of the suspension winding, transmitting the transformed detection current and voltage into the back electromotive force model to generate back electromotive forces ealpha2 and ebeta2 of a stator; then constructing an expanded flux linkage observer of the suspension winding, namely, acquiring flux linkage observed values Psix and Psiy by taking the back electromotive forces as input signals of the expanded flux linkage observer; and finally constructing an expanded displacement observer, namely, performing the coordinate transformation on the three-phase detection current of a torque winding and the suspension winding by taking the flux linkage observed values Psix and Psiy as a first input signal of the expanded displacement observer, and finally acquiring the rotor displacement observed values alpha and beta under biphase stationary coordinates by taking the transformed detection current as second and third input signals of the expanded displacement observer. A bearing-free synchronous reluctance motor suspension system constructed by the method saves a displacement sensor, can realize a rotor displacement soft measurement technology and the high-speed and stable suspension running of a controlled motor, and has the advantages of simple structure, easily realized algorithm, quick dynamic response and the like.

Description

technical field [0001] The invention relates to a soft measuring method for the rotor displacement of a bearingless synchronous reluctance motor and a construction method of a suspension system, which is suitable for the displacement sensorless high-speed suspension operation control of the bearingless synchronous reluctance motor, and belongs to the technical field of AC motor control equipment. Background technique [0002] The bearingless synchronous reluctance motor is a new type of special motor with high technical content and high added value. Two sets of windings with a pole logarithm difference of 1 are embedded in the stator slot: torque winding and suspension winding. The current in the winding can make the motor produce inherent rotation and stable levitation. Bearingless synchronous reluctance motors have a series of outstanding advantages: low noise, low power consumption, high speed, no lubrication, high cleanliness, etc., and have a wide range of application p...

AI Technical Summary

Problems solved by technology

However, the defects caused by the use of displacement sensors mainly include: increasing the complexity and volume of the motor and its system, while reducing the reliability of the motor; the displacement sensor increases the cost of the system, and has strict requirements on installation conditions and use environment, which restricts the motor. Promoted application of

The applicant has applied for a national invention patent (application number: 201010017952.6) 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 , increase the torque ripple of the motor, and the algorithm of this method is complicated, which increases the complexity of the software and hardware of the motor control system, and reduces the voltage utilization rate of the inverter

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