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Starting control system and method of brushless double-fed motor

A doubly-fed motor and start-up control technology, applied in the direction of start-up devices, etc., can solve the problems of increasing equipment volume and cost, and achieve the effect of reducing equipment cost and volume

Inactive Publication Date: 2016-03-09
EAST GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional asynchronous start-up process, whether it is to control the winding in series with frequency-sensitive resistors or variable resistors, or to add short-circuit contactors, it will increase the size of the equipment and increase the cost

Method used

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  • Starting control system and method of brushless double-fed motor
  • Starting control system and method of brushless double-fed motor
  • Starting control system and method of brushless double-fed motor

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] A brushless doubly-fed motor starting control system, which can use the traditional frequency converter to realize the asynchronous starting of the motor without adding frequency-sensitive resistors, variable resistors or short-circuit contactors to the control winding, and will not increase equipment cost and volume . figure 1 It is a schematic structural diagram of a starting control system for a brushless doubly-fed motor in an embodiment. The starting control system of the brushless doubly-fed motor includes a frequency converter 110, a first contactor KM1, a second contactor KM2, a spe...

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Abstract

The invention relates to a starting control method of a brushless double-fed motor. The starting control method comprises the following steps of carrying out soft starting on a frequency converter; controlling an upper bridge arm or a lower bridge arm in a full-bridge inverter circuit in the frequency converter to be synchronously conducted so as to make a control winding of the brushless double-fed motor short-connected; supplying power to a power winding in the brushless double-fed motor and beginning asynchronous starting; taking a rotational speed of the brushless double-fed motor already subjected to asynchronous starting as a double-fed synchronous running rotational speed; controlling the frequency converter to output a frequency corresponding to the double-fed synchronous running rotational speed, and controlling the frequency converter to supply power to the control winding so that the brushless double-fed motor enters a synchronous running state; and controlling the frequency converter to gradually reduce the output frequency until the rotational speed of the brushless double-fed motor reaches a natural synchronous rotational speed, and completing the starting process. With the above starting control method of the brushless double-fed motor, the reduction of the device cost and volume isfacilitated. The invention also relates to a starting control system of the brushless double-fed motor.

Description

technical field [0001] The invention relates to the technical field of starting a brushless double-fed motor, in particular to a starting control system and method for a brushless double-fed motor. Background technique [0002] Brushless double-fed motor is a new type of motor. The brushless doubly-fed motor evolved from the cascaded motor. It realizes the brushless structure through two sets of stator windings (power winding and control winding respectively) plus a specially designed rotor, thereby improving the reliability of the motor. Brushless doubly-fed motors can operate as both generators and motors. When running as a motor, there are starting issues involved. The start of the brushless doubly-fed motor refers to the motor from the speed of 0 to the speed of the motor's natural synchronous speed n N the process of. [0003] The traditional starting methods of brushless doubly-fed motors are divided into synchronous starting and asynchronous starting. Synchronous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20
CPCH02P6/20
Inventor 孔铭高信迈吴文辉
Owner EAST GRP CO LTD
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