Construction method of a bearingless synchronous reluctance motor suspension system

Abstract

The invention discloses a method for constructing a bearing-free synchronous reluctance motor suspension system. During construction of the system, the method comprises the following steps of: constructing an expanded displacement observer; then transmitting three-phase detection current, which is subjected to coordination transformation, of a motor suspension winding and a torque winding into the input end of the expanded displacement observer; synchronously outputting a rotor displacement observed value and a suspension force reference value by the expanded displacement observer as input signals of an expanded suspension force / current modulator; transmitting deviations between two output current component rated values and two-phase detection current subjected to the coordination transformation into two input ends of an inner die controller respectively, and outputting two voltage rated signals as input voltage of a space vector pulse width modulation (SVPWM) inverter; supplying power to the motor suspension winding by the SVPWM inverter so as to generate an expected suspension force, and thus realizing rotor displacement observation for a controlled motor and decoupling control for the inner die of current of the suspension winding. The constructed suspension system has the advantages of high response speed, simple structure, high performance and the like.

Description

technical field [0001] The invention relates to the technical field of AC motor control, in particular to a bearingless synchronous reluctance motor suspension system construction method based on rotor displacement observation and current internal model decoupling control method, which is suitable for bearingless synchronous reluctance motor suspension system under high-speed conditions without displacement sensors. Resistance motor current decoupling control. Background technique [0002] The bearingless synchronous reluctance motor is to superimpose an additional set of windings (suspension windings) on the stator windings (torque windings) of ordinary synchronous reluctance motors to generate a radial magnetic levitation force that supports the constant suspension of the rotor and control two sets of motors. The current of the winding can make the motor generate electromagnetic torque and levitation force at the same time. The special structure determines that the bearin...

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Problems solved by technology

[0003] At present, in the bearingless synchronous reluctance motor suspension system, most of the accurate detection of the radial displacement of the rotor adopts the mechanical eddy current displacement sensor. The defects brought by the displacement sensor are: the displacement sensor increases the manufacturing cost of the motor system, and at the same time leads to the motor. Increased size reduces the reliability of the motor

A national invention patent application (Application No.: 201010017952.6) has been disclosed in the prior art about a displacement sensorless control method for a bearingless synchronous reluctance motor, but the algorithm of the method described in the application is complicated, and it is difficult for the software and hardware of the control system. The requirements are high, and the additional injected high-frequency signal will increase the torque ripple

[0004] On the other hand, under high-speed conditions, the suspension winding stator current of the bearingless synchronous reluctance motor has a complex coupling relationship, which leads to poor transient regulation performance of the traditional suspension system. Interference between currents, there are no relevant patents and literature related to this issue

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