Bearingless motor control system based on nine-switch inverter

A nine-switch inverter, bearingless motor technology, applied in the control system, vector control system, motor generator control and other directions, can solve the problems of high cost, limit the popularization and application of bearingless motor, and large system volume, and achieve remarkable results. The effect of technological progress

Pending Publication Date: 2020-09-15
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the inverter circuits of double-winding bearingless motors are based on two three-phase bridge inverters. The system is bulky and difficult to integrate, which makes the control system of bearingless motors complicated and expensive, which limits the popularization and application of bearingless motors.

Method used

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  • Bearingless motor control system based on nine-switch inverter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] see figure 1 , which is based on a bearingless motor control system based on a nine-switch inverter, is characterized in that it includes a radial suspension force control subsystem 1, an electromagnetic torque control subsystem 2, a nine-switch inverter middle tube control subsystem 3, The bearingless motor 15, the radial suspension force control subsystem 1 and the electromagnetic torque control subsystem 2 are connected to the bearingless motor 15 through the tube control subsystem 3 in the nine-switch inverter. Control bearingless motor 15 to run.

Embodiment 2

[0019] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0020] In this embodiment, the radial suspension force control subsystem 1 includes displacement regulators 4, 5, a 2 / 3 conversion link 6, a current regulator 7, and a suspension SPWM modulation link 8; the displacement regulators 4, 5 The 2 / 3 conversion link 6 and the current regulator 7 are connected to the suspension SPWM modulation link 8 in turn; wherein, the x-direction displacement sensor and the y-direction displacement sensor respectively collect the x and y rotor displacement offsets, and through the position negative feedback, pass through the x-direction The displacement regulator and the y-direction displacement regulator are transformed by 2 / 3 to obtain the reference current under the a-b-c shaft system. The current sensor collects the three-phase current of the suspension winding and makes a difference with the reference current to obtain the difference e 2A ...

Embodiment 3

[0025] This embodiment is basically the same as the foregoing embodiment, and the special features are as follows:

[0026] as attached figure 1As shown, the bearingless motor control system based on the nine-switch inverter includes the levitation force control subsystem 1, the electromagnetic torque control subsystem 2, the tube control subsystem 3 of the nine-switch inverter and the alternating pole bearingless permanent The magnetic synchronous motor 15, the nine-switch inverter and the middle tube control subsystem 3 also include the nine-switch inverter and the middle tube control link.

[0027] Specifically, the main circuit of the three-phase nine-switch inverter includes nine discrete IGBT switching devices, three IGBTs of each bridge arm are connected in series in sequence, and the nine-switch inverter has two three-phase power output terminals, each The midpoints of the upper tube and the middle tube of each bridge arm are connected with the torque winding, and the...

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Abstract

The invention discloses a bearingless motor driving system based on a nine-switch inverter, which comprises a radial suspension force control subsystem, an electromagnetic torque control subsystem, anine-switch middle tube control subsystem and a bearingless motor. The nine-switch middle tube control subsystem controls generation of middle tube signals, nine-switch upper tube signals and nine-switch lower tube signals are taken from upper bridge arm signals of a suspension winding and lower bridge arm signals of a torque winding respectively, nine paths of PWM signals are generated and outputto the nine-switch inverter, and a bearingless permanent magnet synchronous motor is controlled to operate.

Description

technical field [0001] The invention relates to a bearingless motor control system based on a nine-switch inverter, which is suitable for the fields of medical treatment, pharmacy, aerospace, high-speed centrifuge and the like. Background technique [0002] The bearingless motor is to embed the levitation control winding in the stator of the ordinary motor. Through the effect of the levitation winding magnetic field on the original winding magnetic field with different pole pairs, the symmetrical distribution of the air gap magnetic field is changed, and a controllable magnetic levitation force is generated on the rotor. The suspension operation of the rotor is realized, which is the technical direction for the AC motor to achieve high speed and high power at the same time, and has broad application prospects. [0003] At present, the inverter circuit of the double-winding bearingless motor is based on two three-phase bridge inverters. The system is bulky and difficult to in...

Claims

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Application Information

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IPC IPC(8): H02P21/22H02P27/08
CPCH02P21/22H02P27/085
Inventor仇志坚卢茂祥陈王卫
OwnerSHANGHAI UNIV