Double-feeding speed varying salient-pole synchronous motor

A synchronous motor, salient pole technology, applied in the direction of synchronous generator, etc., can solve the problem of unrealizable structure

Inactive Publication Date: 2002-02-13
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This kind of motor, because the rotor has a special 'nest' loop structure, and at the same time, it uses the difference in magnetic permeability of the d and q axes, to implement it on a large hydroelectric unit, the diameter of the rotor must reach more than ten meters. Generating hundreds of thousands of kilowatts of power is structurally impossible
At the same time, for doubly-fed AC excitation motors and doubly-fed brushless motors, there are many problems in reactive power regulation and system stability, and it is still quite difficult to meet the requirements of large-scale hydropower units for variable speed synchronization

Method used

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  • Double-feeding speed varying salient-pole synchronous motor
  • Double-feeding speed varying salient-pole synchronous motor
  • Double-feeding speed varying salient-pole synchronous motor

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Embodiment Construction

[0044] by Figure 4 The doubly-fed variable-speed salient-pole synchronous motor shown is taken as an example for implementation description. The number of pole pairs of the motor is P=2, the number of slots of the stator is Z=48, the stator is a three-phase symmetrical winding, and the number of parallel branches is a. The rotor has d, q two-phase windings, and the number of magnetic pole pairs is 2P=4, wherein the magnetic poles of the d-phase winding are Nd and Sd respectively, and the magnetic poles of the q-phase winding are Nq and Sq respectively, and the d and q two-phase excitation windings are in space The phase difference is 90° electrical angle, and the time difference is 90° electrical angle. The d and q two-phase excitation windings form an orthogonal winding, and corresponding damping windings are installed on the magnetic poles. The stator is powered by a symmetrical three-phase AC power supply, and the two-phase excitation windings of the rotor d and q are res...

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Abstract

The present invention relates to the motor principle of motor and the improvement of its structure and aims at realizing the speed varying of salient-pole synchronous motor, especially large-scale hydroelectric generating set. The motor of the present invention has stator with the same structure as common AC motor and P pairs of poles, and rotor structure with mP pairs of splited salient magneticpoles and exciting winding comprising m phase and P pairs winding units with m being 2-6. The double-feeding speed varying synchronous motor of the present invention can meet the requirement of large-scale hydroelectric generating set in energy accumulating power generation, second-term development and operation in optimized conditions as well as the requirement of power system to speed varying synchronous motor.

Description

technical field [0001] The invention belongs to the improvement of the principle and structure of a motor, in particular to a salient-pole synchronous motor. Background technique [0002] my country is a country rich in hydropower resources, and the development of hydropower resources is a basic national policy for the country's long-term development. In the current western development, a large number of large-scale hydropower construction projects, especially pumped storage power stations, must be developed and constructed. In a pumped storage power station, when the energy storage unit operates as a motor-pump, its speed is often required to be slightly higher than the generator speed, and the synchronous motor is required to have a variable speed function and the speed can be adjusted. If a variable-speed synchronous motor is used, it can keep the water turbine in the best working condition all the time when the generator is running, and it can also run stably under light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K19/16
Inventor 宁玉泉
Owner HUAZHONG UNIV OF SCI & TECH
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