High-current low-voltage DC electromotor control switch

Abstract

The invention discloses a big electric current milker control reverse switch, which including the boring bar and two groups mutually correspond move touch pieces and whisht touch pieces, and also includes four wiring columns: L1 and L2 separately meet the direct current power supply plus minus pole, D1 and D2 separately meets the electrical machinery two terminals of the direct current electric motor; Among them, the boring bar has three positions: When the boring bar is in the stop position, two groups move touch pieces all no touch with the whisht pieces, the electric circuit do not pass, the electric motor does not transfer; When the boring bar tune in on the clockwise position, a and d electronic contact closed, the electrical machinery puts through the power source to revolve; When the electric motor must to reverse direction revolution, may tune the boring bar in on the reverse position, this time b and c touch pieces put through, electric motor commutation reverse. The invention had compact structure, all parts of the invention fixed in the insulating board, the insulating ability is better, may use in the big electric current low pressure situation.

Description

technical field [0001] The invention relates to the field of electricity, in particular to a high-current low-voltage direct current motor control reverse switch. Background technique [0002] According to the phenomenon of fast aging, short life, frequent replacement and difficult operation of the reverse switch in the electric vehicle (especially electric tricycle) market this year, the applicant analyzed by the technical personnel: the mechanical reverse switch used on ordinary electric tricycles It is diverted from the reverse switch used for AC (220~380v) motor control, and has not been improved according to the driving conditions of DC, low voltage, and high current motors. The maximum rated current is only 20 amps. In actual use, because the vehicle is under load for a long time, the line current often reaches 40-100A, and the instantaneous overload current can reach more than 150A. Such a large current causes the contact of the reverse switch to overheat, oxidize, a...

AI Technical Summary

Problems solved by technology

Such a large current leads to excessive temperature, oxidation, and increased resistance of the reversing switch contacts, which eventually accelerates the aging of the switch and shortens its life.

However, the existing high-power DC electromagnetic contactor type inverted control switch is difficult for consumers to accept because of its high price, and the circuit installation is complicated.

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