Direct suspending power control method for permanent magnet type non-bearing motor

A technology of bearingless motor and control method, applied in the direction of magnetic attraction or thrust holding device, electrical components, etc., can solve the problems of complex control algorithm, low utilization rate of DC bus voltage, high switching loss, etc.

Inactive Publication Date: 2009-03-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

[0004] The traditional levitation winding control is to control the levitation winding magnetic field by controlling the levitation winding current, thereby indirectly controlling the magnitude and direction of the levitation force. Limitation, there is a shortcoming of slow dynamic suspension response
[0005] The traditional suspension winding vector control requires the rotation coordinate transformation of the stator and rotor, and the control algorithm is complex
[0006] The traditional suspension winding control adopts the current tracking inverter and the sinusoidal pulse width modulation method (SPWM), the utilization rate of the DC bus voltage is not high, the switching times of the switching devices of the inverter are many, and the switching loss is high

Method used

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  • Direct suspending power control method for permanent magnet type non-bearing motor
  • Direct suspending power control method for permanent magnet type non-bearing motor
  • Direct suspending power control method for permanent magnet type non-bearing motor

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Embodiment Construction

[0026] Such as figure 1 shown. A direct suspension force control method of a permanent magnet bearingless motor, characterized in that the lateral real-time displacement signal x of the rotor of the permanent magnet bearingless motor is collected by an X-axis displacement sensor, and the permanent magnet bearingless motor is obtained by collecting a Y-axis displacement sensor. The longitudinal real-time displacement signal y of the motor rotor, the horizontal real-time displacement signal x and the given lateral reference displacement signal x of the permanent magnet bearingless motor rotor * The lateral displacement difference Δx is obtained through the position loop in the x direction, and the longitudinal real-time displacement signal y and the given longitudinal reference displacement signal y of the permanent magnet bearingless motor rotor * The longitudinal displacement difference Δy is obtained through the position ring in the y direction, and the lateral displacement ...

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Abstract

The invention discloses a direct suspension force control method for a permanent-magnet-type bearing-free motor, and the method belongs to a bearing-free motor control method. The method controls the crest value and the direction of the space vector of a suspension winding stator flux through properly selecting the switch state of an inverter while maintaining the invariableness of an air-gap-flux composed by motor winding, and the suspension is controlled by adopting a closed loop, thereby further decoupling the torque control winding and the suspension winding. The invention is a control method with high suspension control precision, fast dynamic response and small motor parameter influence.

Description

technical field [0001] The invention relates to a control method of a bearingless motor, in particular to a method for directly controlling the suspension force of a permanent magnet type bearingless motor. Background technique [0002] The control of permanent magnet type bearingless motor is usually divided into two parts: torque control and levitation force control. [0003] At present, domestic and foreign scholars' research on bearingless motor control is focused on how to realize the decoupling of the torque winding and the suspension winding. The decoupling control algorithm is based on the fact that the torque winding control adopts the rotor magnetic field with zero d-axis current. On the basis of directional vector control, the levitation effect not only depends on the accuracy of the magnetic field oriented control of the torque winding, but also is constrained by the accuracy of the magnetic field oriented control of the levitation winding itself. [0004] The t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N15/00
Inventor 仇志坚邓智泉王晓琳李楠
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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