What are the types of induction motor starters?

Starting of an Induction Motor

  • Direct on-line starter. The direct on-line starter method, of an induction motor, is simple and economical.
  • Star delta starter. The star delta starter method of starting three-phase induction motors is very common and widely used among all the methods.
  • Autotransformer starter.

What are the different types of starters?

Type of Motor Starters:

  • Manual Starter.
  • Magnetic Starter.
  • Direct Online (DOL) Starter.
  • Stator Resistance starter.
  • Rotor Resistance or Slip Ring Motor Starter.
  • Autotransformer Starter.
  • Star Delta Starter.
  • Soft Starter.

What are the different types of starters used for 3 phase induction motor?

The various types of starters used for starting a 3-phase induction motor are,

  • Full Voltage Starting : Direct-on-line (D.O.L) starter (full voltage starting).
  • Reduced Voltage Starting : Autotransformer starter. Star-delta starter (Reduced voltage starting). Rotor resistance starter (Used for slip ring motors).

Which starter is best for induction motor?

Induction motors can be started directly on-line using a DOL starter which generally consists of a contactor and a motor protection equipment such as a circuit breaker. A DOL starter consists of a coil operated contactor which can be controlled by start and stop push buttons.

What is DOL starter?

A DOL starter (also known as a direct on line starter or across the line starter) is a method of starting a 3 phase induction motor. In a DOL Starter, an induction motor is connected directly across its 3-phase supply, and the DOL starter applies the full line voltage to the motor terminals.

Why starter is used in induction motor?

⇒ The starter is a device which is basically used to limit the starting current by supplying reduced voltage to the motor at the time of starting. From the expression of rotor current it can be seen that the current at start can be controlled by : By reducing the supply voltage at the time starting.

Where is DOL starter used?

The applications of DOL starters are primarily motors where a high inrush current does not cause excessive voltage drop in the supply circuit (or where this high voltage drop is acceptable). Direct on line starters are commonly used to start small water pumps, conveyor belts, fans, and compressors.

What is the difference between DOL and star delta?

Both types of starters also have great differences in case of starting times. The starting time of star delta starter is larger than the DOL starter….

DOL Starter Star Delta Starter
Full voltage is applied to the motor at the starting The voltage is reduced to a lower value