Excitation output control method and device and motor

Abstract

The invention relates to the field of excitation control, in particular to an excitation output control method and device and a motor. The method comprises: arranging a photoresistor in an excitationloop; and controlling a controllable light emitting diode to act on the photoresistor by utilizing the control data matrix so as to linearly control the resistance value of the photoresistor and further linearly control the excitation output. The beneficial effects of the method are that the excitation output can be accurately controlled through the controllable light-emitting diode and the photosensitive resistor. The exciting current controlled by the method is continuously changed, the current impact generated in an exciting voltage loop is small, and strong electromagnetic radiation interference and harmful impact on the exciting winding in the existing scheme are eliminated. In addition, due to the fact that a switching device is not used, the excitation output controller is longer inservice life, more stable in work and more durable.

Description

technical field [0001] The invention relates to the field of excitation control, in particular to an excitation output control method, device and motor, which are used to reduce the volume of an excitation regulator, prolong its life and improve excitation safety. Background technique [0002] Automatic excitation regulator (hereinafter referred to as automatic excitation regulator) refers to electronic equipment that automatically outputs excitation current to synchronous generators and synchronous motors through microcomputer system control to control their stable output. [0003] At present, there are many manufacturers of automatic excitation regulators, with different software and hardware implementations, but the basic design principle is the same: that is, the controllable switching devices (such as FETs, IGBTs, etc.) are controlled by outputting PWM signals through the microcomputer system. , and so on; each manufacturer chooses differently, and the function is simil...

AI Technical Summary

Problems solved by technology

[0005] 1. The controllable switching components for automatic excitation regulators are generally expensive and are the components with the largest heat generation and radiation interference in the system. These are determined by their physical principles and material characteristics, and there is no possibility of optimization

Therefore, the controllable switching elements in the automatic regulator need to be equipped with a large cooling device, which increases the space it occupies.

[0006] 2. The physical principle of the controllable switching element determines that its successful switching life is not very long. No matter what material and technology the controllable switching element is realized with the extension of the number of times and time of use, the ratio of its successful on-off circuit is one Downward curve, eventually loses practical significance

Therefore, the controllable switching element is a consumable part in the automatic excitation regulator

[0007] 3. Since the excitation voltage circuit in the prior art is in a continuous on-off state, the continuous presence or absence of the circuit current will generate a continuous surge impact, which will cause great electromagnetic interference to the surroundings, and more importantly, will shorten the excitation winding life

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