Double-feed motor adopting AC-DC-AC current transformer for speed regulation and its start control method

A technology of AC-DC-AC converters and motors, which is applied in the direction of AC motor control, starters of single multi-phase induction motors, motor generators/starters, etc. Complicated process and other problems, to achieve the effect of reducing starting current and continuous speed regulation
CN101345464AInactive Publication Date: 2009-01-14北京清能华福风电技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
北京清能华福风电技术有限公司
Publication Date
2009-01-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a double feed motor with an ac-dc-ac converter for speed control. The double feed motor adopts the ac-dc-ac converter instead of the conventional ac-ac converter, and designs a set of start scheme for stator-side short-circuit and rotor-side variable frequency combining the characteristic of the ac-dc-ac converter. The double feed motor combining the start scheme solves the problems in the prior art, effectively reduces the starting current of the motor, avoids the motor speed falling out of the regulating range of the converter during the switching process, simultaneously realizing starting with load.
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Description

technical field

[0001] The invention relates to a doubly-fed motor which adopts an AC-DC-AC converter to control the speed of the motor stator and rotor, and also relates to a start-up control method of the doubly-fed motor. Background technique

[0002] With the development of power electronics technology, the doubly-fed speed control system composed of a converter composed of high-power semiconductor devices and a doubly-fed motor has received the attention of many people. Its main working principle is the stator and rotor three-phase The windings are respectively connected to two independent three-phase symmetrical power supplies. The power supply of the stator winding is a fixed-frequency industrial power supply, while the amplitude, frequency and phase of the rotor power supply voltage need to be adjusted separately according to the operation requirements. This speed regulation method has the advantages of adjustable power factor, high efficiency, small capacity of freq...

Claims

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