Brushless excitation method and device for synchronization of wound rotor asynchronous motor
A technology for asynchronous motors and excitation devices, which is applied to starters of single multi-phase induction motors, starters of single synchronous motors, motor generators/starters, etc., and can solve problems such as small excitation current and inability to build an excitation motor. To achieve the effect of ensuring normal excitation
Inactive Publication Date: 2009-09-16
HEBEI IRON AND STEEL
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Problems solved by technology
[0007] In view of the shortcomings of the existing technology and the problems faced in the solution, it will be an important breakthrough if a new excitation scheme for the synchronization of large-scale wound asynchronous motors can be proposed technically, which will solve the existing problems in the synchronization of large-scale wound asynchronous motors. A series of difficult problems such as too small excitation current and inability to build an excitation motor open up a new way for the synchronization of large-scale wound asynchronous motors
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[0020] The invention relates to a brushless excitation method for synchronizing a winding type asynchronous motor and a device for realizing the method.
[0021] The method proposed by the present invention is: an excitation generator is set outside the wound asynchronous motor, and the excitation generator supplies the excitation current to the wound asynchronous motor; the excitation generator and the wound asynchronous motor are connected by a brushless connection . This method solves a series of difficult problems in the synchronization of large-scale wound asynchronous motors, such as the excitation current is too small, and the excitation motor cannot be built in.
[0022] figure 1 It is shown that the present invention provides a high-current power supply to the rotor winding of a synchronous wound motor through an external excitation generator. The external excitation generator and the non-load side shaft of the wound asynchronous motor are rigidly connected concentr...
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A brushless excitation method and a device for synchronization of a wound rotor asynchronous motor belong to the technical field of auxiliary equipments of motors, aiming at solving the technical problem of designing a brushless excitation method and a device for synchronization of large wound rotor asynchronous motors. The technical proposal is as follows: an excitation generator is arranged outside the wound rotor asynchronous motor and provides exciting current for the wound rotor asynchronous motor; a rotating shaft of the excitation generator is connected with a rotating shaft on the non-load side of the wound rotor asynchronous motor in a rigid and concentric way; a stator of the excitation generator is provided with exciting winding and a rotor of the excitation generator is connected with rotor winding of the wound rotor asynchronous motor by a rectifying device. The invention provides high current power supply for the rotor winding of the synchronized wound rotor motor by the way of external brushless excitation and solves a series of hard problems such as too low exciting current and impossible internal arrangement of excitation motors encountered by the current large wound rotor asynchronous motors during synchronization.
Description
technical field [0001] The invention relates to an excitation method for synchronous operation of a large winding motor and a device for realizing the method, belonging to the technical field of motor auxiliary equipment. Background technique [0002] In actual operation, the large-scale wound asynchronous motor is easy to consume reactive power of the grid because the power factor is lagging behind that of the synchronous machine; Therefore, the synchronization of wound motors is a good measure and method for energy saving, and it has positive significance for promoting energy saving. [0003] Asynchronous motors are divided into squirrel-cage asynchronous motors and wound-type asynchronous motors. The essential difference is that the squirrel-cage machines on the rotor are cast copper bars or aluminum bars, which are cast together by the rings at both ends and cannot be separated by phase. The cage-type motor cannot be realized by the traditional synchronous method, that ...
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Inventor 杨庆申
Owner HEBEI IRON AND STEEL