Soft-start-type winding type brushless doubly-fed motor

A doubly-fed motor, soft start technology, applied in the direction of motor generator/starter, single multi-phase induction motor starter, etc., can solve the problem of reducing the starting and running reliability of the motor, increasing the cost of the motor and its control device, etc. problem, to achieve the effect of simple structure, high reliability and low overall cost

Inactive Publication Date: 2019-12-31
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To achieve voltage regulation and frequency regulation, electronic components such as silicon controlled rectifiers must be used, which will inevitably greatly increase the cost of the motor and its control device, and significantly reduce the reliability of the motor's starting and running

Method used

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  • Soft-start-type winding type brushless doubly-fed motor
  • Soft-start-type winding type brushless doubly-fed motor
  • Soft-start-type winding type brushless doubly-fed motor

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with accompanying drawing:

[0024] Such as figure 1 As shown, the brushless double-fed motor includes a stator 1 and a rotor 2. In this embodiment, the number of poles of a power winding is selected as p p =4, the number of main harmonic poles p m = 2 and the number of subharmonic poles p s =8 brushless doubly-fed motor, select the number of poles of the control winding as p c =8, select the number of stator slots as 36, and the number of rotor slots as 24.

[0025] For the power winding on the stator winding, since each phase of a 4-pole motor has 4 equal-phase bands, it is impossible to form a strictly symmetrical three-star / delta connection. But for a 36-slot 4-pole motor, each phase has 12 slot numbers, which can be equally divided into 3 branches, and each branch occupies 4 slot numbers. Through the research, it is found that the difference in the electromotive force induced by the 4-pole fu...

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Abstract

The invention relates to a soft-start-type winding type brushless doubly-fed motor. The motor comprises a stator and a rotor. The stator is provided with two sets of power windings and control windings with different numbers of poles. The power windings adopt a three-star / triangle connection method, and the control windings adopt a star connection method. A connection mode of the power windings istriangle connection during soft start so as to generate a pp pole fundamental wave, a pm pole main harmonic wave and a ps pole auxiliary harmonic wave, and pp is greater than pm and is less than ps.During normal operation, the power windings adopt a three-star connection method so as to generate the pp pole fundamental wave. A winding type rotor formed by an unequal-turn winding is coupled witha magnetomotive force generated by the power windings during soft starting so that in a starting process, the motor has a small starting current, a starting torque is stable, and then soft starting ofthe brushless doubly-fed motor is achieved. When the motor is transited from a soft start state to a normal operation state, a wiring mode of a power winding port only needs to be changed without power off. The motor has characteristics of high reliability, low comprehensive cost and a simple structure.

Description

technical field [0001] The invention relates to the field of brushless double-fed motors, in particular to a soft-start type winding brushless double-fed motor. Background technique [0002] A brushless doubly-fed motor is a multi-port motor with two AC motor ports and one general mechanical port. Unlike the synchronous speed of traditional motors, which is completely determined by a single power supply frequency and the actual number of pole pairs, there are two sets of windings with different pole numbers on the stator of the brushless doubly-fed motor, namely the control winding and the power winding. By changing the power supply frequency of the stator winding and connection methods to control the running state of the motor. [0003] "Soft start" is a topic of great concern to the belt conveyor machine manufacturing industry. Because the conveyor belt is an elastic energy storage material, a large amount of elastic potential energy will be generated when the belt conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/32
CPCH02P1/32
Inventor 阚超豪李霄金科郑洁
Owner HEFEI UNIV OF TECH
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