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Start method and device for brushless dual-feedback electromotor

A double-fed motor and starting device technology, which is applied to the starter, electromechanical device, motor generator/starter of a single multi-phase induction motor, etc., can solve the complex structure of the brushless double-fed motor, motor overheating and torque oscillation , start-up and control difficulties, etc., to achieve the effects of small mechanical impact, improved reliability, and fewer times

Inactive Publication Date: 2008-09-17
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Compared with ordinary asynchronous motors, the structure of brushless doubly-fed motors is complex, making it more difficult to start and control, especially the inrush current of the motor during the start-up process is relatively large, resulting in overheating of the motor and oscillation of the torque

Method used

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  • Start method and device for brushless dual-feedback electromotor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1. The number of pole pairs of the power winding Pp=3, the number of pole pairs of the control winding Pc=1, the power supply voltage of the power winding is 380V, the power supply voltage of the control winding inverter is 220V, the rated power is 2KW, and the asynchronous and stable speed at no load The given speed is 960 rpm, and the given speed is 810 rpm. The resistance value of each phase of the three-phase symmetrical starting resistor is 8 times that of the stator resistance of each phase of the control winding. The frequency conversion controller adopts a dual PWM voltage type inverter.

[0026] The specific startup method is as follows:

[0027] a. Before starting the brushless doubly-fed motor, keep the inverter switch 4 off, close the starting resistor switching switch 5, and connect the three-phase symmetrical starting resistor 2 into the control winding; and start working;

[0028] b. Close the power winding power switch 9, the power winding 11...

Embodiment 2

[0032] Embodiment 2: The resistance connected in series to the control winding is a three-phase symmetrical resistance, and the resistance value of each phase is 6 times of the stator resistance of each phase of the control winding. Others are the same as in Embodiment 1, omitted.

Embodiment 3

[0033] Embodiment 3. The resistors connected in series to the control winding are three-phase symmetrical resistors, and the resistance value of each phase is 10 times that of the stator resistance of each phase of the control winding. Others are the same as in Embodiment 1, omitted.

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Abstract

The present invention provides a method for actuating a brushless double-feed electric motor and the device thereof. The actuating method comprises the following procedures: executing self-checking to the transducer and controller before the actuation of the brushless double-feed electric motor; controlling a winding series resistance by the brushless double-feed electric motor, energizing a power winding for asynchronous actuating; taking the asynchronous steady speed at this time as a synchronous steady speed of double-feed operation, leading to that the transducer outputs the corresponding frequency, disconnecting the control winding from the staring resistance, switching to the transducer for electric supply, and changing the operation mode of the electric motor from asynchronous mode to double-feed operation mode at this time; and adjusting the output frequency of the transducer by the controller according rotating speed and the datum speed of the electric motor until the requirement of rotating speed of the electric motor is satisfied. The control device is composed of a power winding, a control winding, a stator of the brushless double-feed electric motor and a rotor of the brushless double-feed electric motor. The device of the invention has the advantages of small current impact, small electrical torque and oscillation amplitude of the rotating speed, less number, small mechanical impact, excellent protection to the electric motor, reduction of impact to the electric network, and effective reduction to the actuating capacity of the transducer of the control winding.

Description

technical field [0001] The invention relates to a starting method and device for a brushless double-fed motor, and is especially suitable for a brushless double-fed motor with a cage rotor structure. Background technique [0002] Brushless doubly-fed motor is a new type of motor with the advantages of speed regulation. The motor has the advantages of being brushless, sturdy and reliable, and requires low frequency converter capacity. It has broad application prospects in fans and water pumps. [0003] At present, there are two aspects of research on brushless doubly-fed motors, one is the design and improvement of the electromagnetic structure of the motor body, so as to promote the practical use of brushless doubly-fed motors as soon as possible; the other is the research on motor control methods Research, at present, the control method of the motor is still in the theoretical research stage in China. [0004] It is a complex transition process from starting to synchronizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/26H02K11/00
Inventor 邓先明谭国俊张海忠袁启东张晓
Owner CHINA UNIV OF MINING & TECH
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