Inductance-regulation motor power saver

Abstract

The present invention provides an inductance-regulation motor power saver. The power saver regulates terminal voltage of a motor through changing of the inductive reactance of an inductor. In the power-saving operation process of a motor, the voltage waveform of the motor is distortionless so as not to generate pollution for a power grid. The power saver comprises a phase detection circuit and an inductive reactance selection circuit configured to automatically regulate terminal voltage of the motor according to the detected phase signals; the inductive reactance selection circuit comprises an electric reactor DKQ and a silicon controlled gate circuit; a plurality of taps are arranged between head end and tail end of an electric reactor coil, the head end of the electric reactor coil is connected with one breakpoint of the current loop of the motor, the head end and the tail end of the electric reactor coil and each tap are connected with the other breakpoint of the current loop of the motor; and the silicon controlled gate circuit allow a certain silicon controlled rectifier to be conducted and allow other silicon controlled rectifiers to be cut off according to the phase signal voltage output by the phase detection circuit. The power saver can save power about 20%; the inductive reactance selection circuit is simple in structure and high in reliability.

Description

technical field [0001] The invention relates to a motor saver, which achieves the purpose of saving electricity by adjusting the electric current of the motor. The saver is suitable for single-phase motors. Background technique [0002] When the motor is running below the rated load, its power factor is reduced, and the efficiency of the motor is low, resulting in a waste of electric energy. In order to achieve the purpose of saving electricity, the usual method is to adjust the terminal voltage of the motor through the thyristor according to the size of the load. figure 2 Curve 3 is the waveform of the motor terminal voltage adjusted by the thyristor, and the power factor can be improved by reducing the motor terminal voltage. The disadvantage of using thyristor is that it will generate high-order harmonics and pollute the power grid; in order to eliminate the influence of high-order harmonics, a filter circuit needs to be set up, which increases the manufacturing cost of ...

AI Technical Summary

Problems solved by technology

The disadvantage of using thyristor is that it will generate high-order harmonics and pollute the power grid; in order to eliminate the influence of high-order harmonics, a filter circuit needs to be installed, which increases the manufacturing cost of the power saver

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