Induction Motor/generator

[waterman]

Hi

Are there any real differences between an induction motor (3 phase squirrel cage) and an induction generator (where the reactive power is supplied by the grid), i.e. are the windings or rotor changed in any way?

[marke]

Hello Waterman

 

If a standard induction motor is connected to the supply, it will rotate close to synchronous speed.

If there there is a load connected to the motor shaft that absorbs power, (the load is driven by the motor) then the motor will draw energy from the supply.

If the load connected to the motor shaft is driven externally and is trying to speed the motor up, the motor will act as a "constant speed brake" and hold the speed to just above synchronous speed. In this case, the motor absorbs power from the load and transfers it to the supply. The motor acts as an induction generator.

 

Three phase motors work equally well as induction motors and induction generators.

Single phase motors do not perform so well as induction generators depending on the start winding an phase shift mechanism.

 

Best regards,

Mark.

[waterman]

Hello Waterman

 

If a standard induction motor is connected to the supply, it will rotate close to synchronous speed.

If there there is a load connected to the motor shaft that absorbs power, (the load is driven by the motor) then the motor will draw energy from the supply.

If the load connected to the motor shaft is driven externally and is trying to speed the motor up, the motor will act as a "constant speed brake" and hold the speed to just above synchronous speed. In this case, the motor absorbs power from the load and transfers it to the supply. The motor acts as an induction generator.

 

Three phase motors work equally well as induction motors and induction generators.

Single phase motors do not perform so well as induction generators depending on the start winding an phase shift mechanism.

 

Best regards,

Mark.