Motor Starter/Motor Control

Motor Starter/Motor Control

A motor soft starter or motor controller is a device or group of devices that serves to govern in some predetermined manner the performance of an electric motor.  A motor soft starter or motor controller might include a manual or automatic means for starting and stopping the motor, selecting forward or reverse rotation, selecting and regulating the speed, regulating or limiting the torque, and protecting against overloads and faults.

It consist of :

  1. Circuit Breaker – A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit.  Its basic function is to interrupt current flow after a fault is detected.
  2. Magnetic contactors – magnetic contactors are a form of electrical relay found on most electrically powered motors.  They act as a go-between for direct power sources, and high-load electrical motors in order to homogenize or balance out changes in electrical frequency which may come from a power supply as well as to act as a safeguard
  3. Overload Relays – Overload relays are designed to imitate (on a much smaller scale) the heating patterns of the electric motor it is installed in, and interrupt the current once the heat sensing mechanism in the relay reaches a certain temperature.An overload relay is made up of a heater paired with normally-closed contacts that open once the heater gets too hot.  The overload contacts are connected in series and located between the contactor and the motor itself to prevent the motor from restarting once the overload trips.
  4. Push Button Switch
  5. Light Indicator
  6. Nema Box

There are many types of starters:

  1. Direct On Line (DOL)
  2. Star delta starter
  3. Auto transformer starter

Used as controller for any motor related products such as compressor, blowers, fans, crushers etc.

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