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A. C. brushless double-fed motor

A doubly-fed motor, winding type technology, applied in the direction of asynchronous induction motors, electromechanical devices, electrical components, etc., can solve the problems of large volume, performance index gap, etc.

Active Publication Date: 2007-09-19
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the iron core of the reluctance rotor must be made into a structure similar to salient poles, the windings of the cage-type short-circuit winding rotor must be made into concentric distributed short-circuit windings. Under the constraints of these conditions, these two types of rotors can only be used for specific applications. The number of poles, and the performance index is quite different from that of the conventional AC motor rotor, and the volume is also larger

Method used

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  • A. C. brushless double-fed motor
  • A. C. brushless double-fed motor
  • A. C. brushless double-fed motor

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Embodiment Construction

[0036] The present invention is further described below with embodiment. Motor rotor, the number of pole pairs of its power winding is p 1 = 7, the rotor winding is required to be a three-phase symmetrical regular 60° phase-belt connection winding, at this time it can be considered to select p 2 =5, according to the relationship p 1 =Z-p 2 , select the number of rotor slots as Z=p 1 +p 2 =12.

[0037] For Z=12, p 1 = 7, if it is required to obtain a three-phase normal 60° phase belt winding, the slot number phase diagram can be drawn first, as shown in Figure 1(a), so that the three-phase slot number distribution can be determined as shown in Figure 1(b) , it can be seen that for p 1 =7 is the three-phase regular 60° phase belt winding, the winding distribution coefficient is cos15°=0.9659; and for p 2 =5, see Figure 2, Figure 2(a) is p 1 = 5 slot number phase diagram, Fig. 2(b) is p 1 =The three-phase slot number determined at 7 and then press p 2 =5 phase redistri...

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Abstract

Provided is an ac blushless double-feed motor relating to ac motor field and aiming to overcome defect of blushless double-feed speed regulating motor. The present invention comprises a stator and a rotor. The rotor winding is composed of variable-pole winding which has different pole-pairs number of p1 and p2. Coil type windings are provided on the rotor. The connection between the coil type winding coils is common m phase symmetirical winding with respect to pole-pairs number p1 and p2. The number z of rotor grooves placing the coil type winding coils satisfies relation: z is equal to p1 adding p2, wherein m is integer equal to or more than 2, p1 or p2 is positive integer. The present invention uses winding 'tooth harmonic' theory of ac motor to configure rotor windings so as to make the rotor winding of high conductor utilization rate. The effect of two sets of windings can be completely realized by only one set of winding, thus the motor structure is simplified, the volume is reduced. The wire connection is flexible, the rail manufacture technic is easy. The invention is particularly applicable for large motor.

Description

technical field [0001] The invention belongs to the field of AC motors, in particular to an AC brushless double-fed motor. Background technique [0002] AC brushless doubly-fed motors are suitable for frequency conversion speed regulation systems, and are characterized by reliable operation and small required inverter capacity. There are two sets of windings on the stator of this motor, and the number of pole pairs in one set is p 1 , another set of pole pairs is p 2 . When the stator winding p 1 Turn on the grid power supply, and the number of magnetic pole pairs is p 1 The rotating magnetic field, the induced current in the rotor produces p 1 In addition to the antipolar magnetic field, p 2 For the pole-to-pole magnetic field, these two pole-logarithmic magnetic fields have opposite directions of rotation relative to the rotor, such as in the stator p 2 The winding is connected to the variable frequency power supply, and the motor speed can be changed by changing th...

Claims

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Application Information

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IPC IPC(8): H02K17/14H02K3/28
Inventor 王雪帆朱泽堂
Owner HUAZHONG UNIV OF SCI & TECH
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