Direct start of a three-phase electric motor. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Direct start of a three-phase electric motor. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electric motors

It is used in industry, at pumping stations, in ventilation and air conditioning, in machine tools, in construction.

Direct start of a three-phase electric motor
Rice. 1. Control scheme

The connection diagram for direct start of a three-phase electric motor consists of: control buttons Start и Stop; limit switch contact KS1; self-feed contact K1.1 and magnetic starter coils K1.

Consider the direction of the electric current in the operation of the circuit and its elements, when the button is pressed Start.

When you press a button Start: via closed button Stop, button contact Start, magnetic starter coil K1 and limit switch contact KS1, the circuit is closed.

Coil K1 magnetic starter K1 retracts the anchor, closes the contact K1.1, the coil becomes self-feeding, the button Start can be released, electric motor AD working.

When reaching the limit switch mechanism, its contact opens KS1 circuit breaks, coil K1 off, motor AD has stopped.

Button Stop, can be used at any time during the operation of the electric motor AD, to open the coil supply circuit K1 and self-feed contact K1.1

Direct start of a three-phase electric motor
Rice. 2. Power scheme

Power supply circuit for direct start of a three-phase electric motor AD, consists of one magnetic starter with power contacts K1.

When turning on the coil K1, power contacts are switched on K1, which, when switched, supply power to the electric motor A.D.

Publication: electro.narod.ru

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