Unlock instant, AI-driven research and patent intelligence for your innovation.

Asynchronous starting device of brushless doubly-fed machine

A technology of asynchronous starting and electric motors, applied in the direction of starting devices, etc., can solve the problems of excessive starting current, increase the volume of motor supporting equipment and production and operation costs, and achieve the effect of reducing volume and saving costs.

Active Publication Date: 2016-04-06
EAST GRP CO LTD
View PDF7 Cites 2 Cited by
  • 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 volume of motor supporting equipment and production and operation costs.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Asynchronous starting device of brushless doubly-fed machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The asynchronous starting method of a brushless doubly-fed motor of this embodiment, such as figure 1 As shown, the inverter includes a full-control brake switch VT 0 And braking resistor R 0 Composed of braking unit, input contactor KM1, soft start resistance R, soft start contactor KM2, input reactor L, three-phase full-bridge inverter unit VI, three-phase full-bridge uncontrolled rectifier unit VR, DC bus capacitor C , The full control brake switch VT 0 And braking resistor R 0 In series connection, the three-phase power supply is connected to the input contactor KM1, the soft start contactor KM2, the input reactor L and the three-phase full bridge uncontrolled rectifier unit VR in turn. The output of the three-phase full bridge uncontrolled rectifier unit VR is connected to the three-phase full bridge Inverter unit VI, the output of the three-phase full-bridge inverter unit VI is connected to the control winding P of the brushless doubly-fed motor C , The DC bus capac...

Embodiment 2

[0043] The asynchronous starting method of a brushless doubly-fed motor of this embodiment further includes step C on the basis of embodiment 1: gradually reducing the braking resistor R 0 The resistance value of the motor will gradually increase until the speed of the motor is stable, and then disconnect the braking resistor R 0 .

[0044] The asynchronous starting method of the brushless doubly-fed motor further includes step D: connecting the DC bus capacitor C to the DC output side of the frequency converter.

[0045] The asynchronous starting method of the brushless doubly-fed motor further includes step E: the three-phase AC power supply charges the DC bus capacitor C, until the DC bus voltage reaches the standard, it will output the variable frequency excitation to the three-phase full-bridge inverter unit VI. Control the winding to complete the soft start of the inverter.

[0046] The asynchronous starting method of the brushless doubly-fed motor further includes step F: cont...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an asynchronous starting device of a brushless doubly-fed machine, and relates to the technical field of brushless doubly-fed machines. A full-controlled switch device of a three-phase full bridge inversion unit is closed, the three-phase full bridge inversion unit is taken as an inverse three-phase uncontrolled rectifier, and power frequency power supply stimulation is applied to a power winding of the machine, so that a control winding senses the voltage of corresponding frequency, the voltage is rectified to a brake resistor for consumption through the three-phase uncontrolled rectifier, equivalently the control winding is switched in a three-phase adjustable resistor, resources of a frequency converter can be sufficiently utilized, namely a starting resistor does not need to be used, the full-controlled switch device of the inversion unit is controlled to be disconnected through software, the starting resistor can be replaced to realize short connection of the control winding through the cooperative use of the inversion unit and the brake resistor, 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 an asynchronous starting device for brushless double-fed motors. Background technique [0002] Brushless double-fed motor is a new type of motor. The brushless doubly-fed motor evolved from the cascaded motor, through two sets of stator windings (respectively power winding and control winding) and a specially designed rotor to achieve a brushless structure; through the variable voltage and frequency control of the control winding to achieve brushless Brush doubly-fed motor variable speed constant frequency power generation or frequency conversion speed regulation electric operation. When running as a motor, there are starting issues involved. The starting of the brushless double-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 brushless double-fed motors ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20
CPCH02P6/20
Inventor 韦忠朝王雪帆徐海波
Owner EAST GRP CO LTD