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Harmonic staring type wound brushless doubly-fed machine

A doubly-fed motor, winding technology, applied to the shape/style/structure of winding conductors, electrical components, electromechanical devices, etc., can solve the problems of inability to increase starting torque and reduce starting current, etc., to achieve broad industrial Effects of application prospect, good starting performance and high operating efficiency

Active Publication Date: 2017-11-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is impossible to achieve the purpose of increasing the starting torque, reducing the starting current and running with high efficiency by connecting or removing the starting resistor in series with the brush in the rotor circuit
At the same time, the brushless double-fed motor has two sets of windings with different numbers of poles, which is also quite different from the asynchronous motor with a single number of poles.

Method used

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  • Harmonic staring type wound brushless doubly-fed machine
  • Harmonic staring type wound brushless doubly-fed machine
  • Harmonic staring type wound brushless doubly-fed machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Select the number of pole pairs of a power winding as p 1 = 2,p 2 = 4, the rotor is 36-slot brushless doubly-fed motor as an example, the rotor winding is divided into p 1 +p 2 = 6 groups, p 1 = 2, p 2 = the greatest common divisor of 4 d=2, get (p 1 +p 2 ) / d=3 is an odd number, according to the above theory, there are 1st, 4th, 2nd, 5th and 3rd, 6th groups of groove numbers, and the induced electromotive forces are all in the same phase under the 4th and 2nd pole pairs, such as figure 1 , figure 2 shown. Here each group is connected by 6 equal turns.

[0034] If it is a conventional brushless doubly-fed motor, the winding connection diagram is as follows: image 3 shown. 2 slot number groups in p 1 = 2, p 2 = 4 The induced electromotive force under the pair of poles is formed by series connection of coil groups with the same phase, so any connection point is designated as the potential reference point, and the potentials of all connection points are zero. ...

Embodiment 2

[0082] Select the number of pole pairs of a power winding as p 1 = 1,p 2 = 3, the rotor 48-slot brushless doubly-fed motor as an example, the rotor winding is divided into (p 1 +p 2 )=4 groups, d=1 is an odd number, according to the above theory, there is a phase difference of kπ between the first group and the third group of slot numbers, where k is an odd number, then the third group of slot numbers is reversed and connected in series with the first group . In the same way, the slot numbers of the fourth group are reversed and connected in series with the second group. The corresponding rotor winding connection diagram of the motor is shown in Figure 8 shown. Here each group is connected by 6 equal turns.

[0083] Therefore, the brushless doubly-fed motor of the present invention has good starting performance and operating efficiency, and is a very ideal rotor winding design method.

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PUM

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Abstract

The invention provides a harmonic staring type wound brushless doubly-fed machine. According to different conduction paths of rotor windings in different magnetic fields, rotor resistance is increased, and leakage reactance is not increased along with increasing of the rotor resistance, it is equivalent to equivalent access of added resistance, and a motor has the good starting performance; during normal operation, by means of change of rotor or stator winding connection, the non-inductive property disappears and is changed into the inductive property, the rotor resistance returns to normal, and it is equivalent to added resistance removal; the machine has the high operation efficiency, and then the wound induction machine can get rid of added starting resistance; the idea of getting rid of a slip ring and a brush is achieved, and the wide industrial application prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a harmonic start-type winding brushless double-fed motor. Background technique [0002] If the brushless double-fed motor wants to have better performance, the key lies in the rotor. Brushless double-fed motor is a new type of AC excitation motor, which has the characteristics of synchronous motor and asynchronous motor. There is no direct electrical connection between the two sets of windings of the stator, but through the coupling of the motor rotor, the rotating magnetic field of the stator with different poles is modulated to realize the electromechanical energy conversion and transmission of the motor. [0003] It can be seen from the working principle of the brushless double-fed motor that the brushless double-fed motor is an asynchronous motor with synchronous operation, that is, the essence of the motor is an asynchronous motor. The small capacity of the inverter on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K3/28
CPCH02K3/28H02K2213/03
Inventor 阚超豪赵威储成龙
Owner HEFEI UNIV OF TECH
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