Starting device of brushless doubly-fed machine

A technology for starting devices and electric motors, applied in starting devices, electronically reversing motor control, electrical components, etc., can solve the problems of excessive starting current, increase of motor supporting equipment and production and operation costs, and achieve cost saving and quantity reduction Effect

Active Publication Date: 2016-04-06
EAST GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of excessive starting current, the asynchronous starting method mainly used in the prior art is a starting method specially configured with a frequency-sensitive rheostat or an adjustable resistor. However, this method greatly increases the cost of motor supporting equipment and production and operation.

Method used

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  • Starting device of brushless doubly-fed machine

Examples

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Embodiment Construction

[0023] The present invention is further described in conjunction with the following examples.

[0024] The starting method of the brushless doubly-fed motor of the present embodiment, such as figure 1 As shown, the motor has been connected with power winding P p , control winding P C And the frequency converter, the DC output side of the frequency converter is connected in parallel with the braking resistor and the three-phase full-bridge inverter circuit VI, and the output terminal of the three-phase full-bridge inverter circuit VI is connected through the control winding P C Connected to the motor, the method comprises the steps of:

[0025] Step A: In the inverter bus capacitor C and braking resistor R 0 The busbars between are connected in series with a busbar switch K D , and then disconnect the bus switch K D to disconnect the DC output of the inverter;

[0026] Step B: braking resistor R 0 A brake switch VT is connected in series 0 , turn on the brake unit switc...

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PUM

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Abstract

The invention discloses a starting device of a brushless doubly-fed machine, and relates to the technical field of brushless doubly-fed machines. The direct-current output of a frequency converter is disconnected, and then switch tubes VT1, VT3, VT5 of an upper bridge arm and switch tubes VT2, VT4, VT6 of a lower bridge arm of a three-phase full bridge inversion circuit VI are disconnected at the same time, so that a brake resistor R0 is connected to a control winding PC, resources of the frequency converter can be sufficiently utilized, namely a starting resistor does not need to be used, the control winding PC can be in short connection by controlling full-controlled switch tube devices of the inversion circuit through software, the volume of the equipment can be reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of brushless double-fed motors, in particular to a starting device for brushless double-fed motors. Background technique [0002] Brushless double-fed motor is a new type of motor. The brushless double-fed motor evolved from the cascaded motor, through two sets of stator windings (respectively power winding P p and control winding P C ) and a specially designed rotor to achieve a brushless structure; through the control winding P C The variable voltage and frequency conversion control realizes the variable speed and constant frequency power generation of the brushless doubly-fed motor or the electric operation of variable frequency speed regulation. When running as a motor, there are starting issues involved. The starting of the brushless doubly-fed motor refers to the process of the motor rising from the speed of 0 to the natural synchronous speed N. [0003] At present, the starting methods of brushle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20
CPCH02P6/005H02P6/20
Inventor 徐海波王雪帆韦忠朝孔明
Owner EAST GRP CO LTD
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