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A three-phase four-wire driving method for a six-pole radial-axial hybrid magnetic bearing

A three-phase four-wire, axial hybrid technology, applied in the directions of shafts and bearings, bearings, electric components, etc., to achieve the effect of reducing volume and cost

Active Publication Date: 2021-09-24
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this driving method needs to meet the requirement that the three-phase current sum is 0, so that the three-phase coil can only control the levitation force of two degrees of freedom.

Method used

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  • A three-phase four-wire driving method for a six-pole radial-axial hybrid magnetic bearing

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] Such as figure 1 As shown, the present invention is composed of a three-phase four-wire driver 1 and a phase A control coil (including a first A phase coil 21 and a second A phase coil 22 ) and a B phase control coil of a six-pole radial-axial hybrid magnetic bearing 2 at the same time. The coils (including the first B-phase coil 23 and the second B-phase coil 24 ), the C-phase control coils (including the first C-phase coil 25 and the second C-phase coil 26 ) and the axial coil 27 provide control current.

[0016] The three-phase four-wire driver 1 is provided with a DC bus voltage by a DC power supply 11, and the voltage stabilizing capacitor (including the first voltage stabilizing capacitor 121 and the first voltage stabilizing capacitor 122) is connected in series to both ends of the bus voltage, and the first voltage stabilizing capacitor 121. T...

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Abstract

The invention discloses a three-phase four-wire driving method for a six-pole radial-axial hybrid magnetic bearing. A DC stabilized power supply is used as the busbar power supply of the three-phase fourwire driver, and two voltage stabilizing capacitors are connected in series to the busbar. , connect equalizing resistors in parallel at both ends of the voltage stabilizing capacitor, use 6 power MOSFETs to form a three-phase bridge circuit, and the middle points are respectively used as the output end of the U-phase current, the output end of the V-phase current, and the output end of the W-phase, U The phase output end is connected to the input end of the A-phase coil of the six-pole radial-axial hybrid magnetic bearing, the V-phase output end is connected to the input end of the B-phase coil of the six-pole radial-axial hybrid magnetic bearing, and the W-phase output The end is connected to the input end of the C-phase coil of the six-pole radial-axial hybrid magnetic bearing, and the output end of the three-phase coil is connected as a node, and then this node is connected to the input end of the axial coil, and the output end of the axial coil Connect to the midpoint of the two voltage stabilizing capacitors.

Description

technical field [0001] The invention relates to a three-phase four-wire driving method for a six-pole radial-axial hybrid magnetic bearing, in particular to a driving method that can simultaneously provide current for a radial coil and an axial coil by using a three-phase power converter , the driving method is suitable for a six-pole radial-axial hybrid magnetic bearing, and belongs to the field of drive control of magnetic suspension bearings. Background technique [0002] Magnetic bearings use electromagnetic force to suspend the rotor in the air, so that there is no contact between the rotor and the stator. It has the advantages of no friction, no wear, no lubricating oil, high speed support, dynamic adjustment of rotor displacement, high rotation accuracy, and long life. Usually radial magnetic bearings adopt a four-pole or eight-pole structure and are driven by two bipolar switching power amplifiers. phase inverter drive. However, this driving method needs to meet th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P17/00H02K49/00F16C32/04
CPCF16C32/0444H02K49/00H02P17/00
Inventor 鞠金涛王加安朱益利张燕红吴志康杨思杰居方明王祥飞
Owner CHANGZHOU INST OF TECH