Excitation supply circuit for synchronous brushless generator

Abstract

The invention discloses an excitation supply circuit for a synchronous brushless generator. A load current supply circuit forming positive feedback with load current is connected in parallel with the two ends of a stator of an excitation winding of an exciter, and compensates for an input signal of an input power supply of the exciter. The input signal of the input power supply is regulated by an automatic voltage regulator, and then excites the excitation winding on the stator of the exciter. The automatic voltage regulator and the load current supply circuit provide voltage and current signals for the exciter at the same time, so that the dynamic performance of the generator is greatly improved, the normal supply of the excitation of the generator can be ensured under various service conditions or load variation conditions with high requirements for the dynamic performance, and the application range of the generator can be widened.

Description

technical field [0001] The invention relates to an excitation supply device for a synchronous brushless generator, which belongs to the technical field of motors. Background technique [0002] At present, the excitation power of a general synchronous brushless generator is directly provided by the automatic voltage regulator, and the input power of the automatic voltage regulator comes from the voltage signal of the main engine. Under normal conditions and stable load conditions, the generator can operate normally. , and has good voltage adjustment characteristics, and the steady-state voltage adjustment rate can reach within ±1%. However, in some special working conditions, such as engineering applications, starting asynchronous machines, etc., which have special requirements on the dynamic performance of the generator, ordinary brushless generators cannot adapt well, and may even change with the terminal voltage of the generator. Reduced, the automatic voltage regulator l...

AI Technical Summary

Problems solved by technology

However, in some special working conditions, such as engineering applications, starting asynchronous machines, etc., which have special requirements on the dynamic performance of the generator, ordinary brushless generators cannot adapt well, and may even change with the terminal voltage of the generator. Reduced, the automatic voltage regulator loses its function, which causes the generator to lose excitation, and the generator no longer generates power

The usual solution is to increase and change the excitation method, and the commonly used excitation method is a phase compound excitation device with compound excitation characteristics or a permanent magnet generator excitation device with a separate power supply. These devices are large in size, difficult to manufacture, Disadvantages such as inconvenient installation and maintenance and high cost

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