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Brushless doubly-fed machine

A technology of doubly-fed motor and armature iron core, applied in the direction of electrical components, electromechanical devices, electric components, etc., can solve problems such as difficulty in meeting high-performance engineering applications, low power factor of brushless doubly-fed motor, torque fluctuation, etc. Achieve the effect of improving the air gap magnetic field distribution, simplifying the processing technology, and improving the operating efficiency of the motor.

Pending Publication Date: 2018-08-24
GUANGDONG SHANGSHUI ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of the present invention is to overcome the deficiencies of the prior art, to provide a brushless double-fed motor, to solve the problem of low power factor, low efficiency, torque fluctuation and Noisy, difficult to meet the requirements of high-performance engineering applications and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Stator armature core punching slot 1 is the stator armature core punching rectangular slot, the number of stator armature core punching rectangular slots is 72, rotor armature core punching slot 2 is the rotor armature core punching slot There are 96 rectangular slots in the rotor armature core. The power winding adopts 72 slots, 2 poles and 3 phases, and the control winding adopts 72 slots, 6 poles and 3 phases.

[0039] In order to further optimize the above technical solution, the number of turns of each coil of the power winding is 22, the coil span Y=29, and a total of 36 coils.

[0040] In order to further optimize the above technical solution, the number of turns of each coil of the control winding is 3, the coil span Y=10, and a total of 72 coils.

[0041] In order to further optimize the above technical solution, the number of turns of the rotor winding coil is 1, and a variable-span wiring method is adopted, with a total of 76 coils.

Embodiment approach

[0042] Here, a brushless double-fed motor with a rated power of 560Kw, a rated speed of 750r / min, a rated power frequency of 50Hz, and a speed range of 750r / min-1000r / min is used to introduce the specific implementation method. The implementation method includes the following steps:

[0043] Step 1: Calculation of stator winding pole pairs. Due to the number of pole pairs of the power winding p p and control winding pole pairs p c The size of the motor determines the speed range of the motor. Combined with the rated speed requirements of the motor, the number of pole pairs can be determined as: p r =p p +p c =4.

[0044] Step 2: Determine the number of pole pairs of control winding and power winding. In order to eliminate the electromagnetic interaction between the two stator windings, the number of pole pairs should satisfy p p ≠p c . Considering that when p p and p c The larger the difference, the more noise and vibration can be reduced and in order to generate a ...

Embodiment 2

[0055] Stator armature core punching slot 1 is the stator armature core punching rectangular slot, the number of stator armature core punching rectangular slots is 72, rotor armature core punching slot 2 is the rotor armature core punching slot There are 56 rectangular slots in the rotor armature core. The power winding adopts 72 slots, 2 poles and 3 phases, and the control winding adopts 72 slots, 6 poles and 3 phases.

[0056] In order to further optimize the above technical solution, the number of turns of each coil of the power winding is 34, the coil span Y=29, and there are 36 coils in total.

[0057] In order to further optimize the above technical solution, the number of turns of each coil of the control winding is 3, the coil span Y=10, and a total of 72 coils.

[0058] In order to further optimize the above-mentioned technical solution, the number of turns of each coil of the rotor winding is 1, and a variable-span wiring method is adopted, with a total of 64 coils. ...

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Abstract

The invention discloses a brushless doubly-fed machine, which comprises a stator and a rotor, wherein stator windings are composed of a power winding and a control winding, the power winding adopts atwo-pole three-phase wiring mode, and each phase has a pole-phase group; the control winding adopts a six-pole three-phase wiring mode, and each phase has three pole-phase groups; the stator is provided with a stator armature core punching groove; and the rotor is provided with a rotor armature core punching groove. The rotor processing process of the brushless doubly-fed machine is simplified, end leakage reactance of the rotor of the brushless doubly-fed machine is reduced, the mechanical strength of the rotor is improved, the insulation performance of an end ring and the motor air gap magnetic field distribution are improved, the machine power factor and the machine operation efficiency are further improved, and the above structure is extremely applicable to a medium or high-power brushless doubly-fed machine.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a brushless double-fed motor. Background technique [0002] The brushless double-fed motor is an AC induction motor composed of two sets of stator windings and rotors with different pole pairs. Since the brushes and slip rings are eliminated on the rotor, the brushless double-fed motor has the advantages of simple structure, safe and reliable operation and low maintenance costs. Low and other advantages, it has been widely used in large-capacity AC frequency conversion speed regulation, marine shaft power generation, hydropower generation and wind power generation. [0003] The key to the good speed regulation performance of the brushless doubly-fed motor lies in the rotor. At present, when the rotor winding is cast, it is necessary to use an additionally designed short-circuit end-ring abrasive tool to complete the manufacture of the conductor end ring, and the short-circuit end...

Claims

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Application Information

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IPC IPC(8): H02K1/16H02K3/28
CPCH02K1/165H02K3/28H02K2213/03
Inventor 杨华
Owner GUANGDONG SHANGSHUI ENERGY TECH
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