What are wound rotor motor & slip ring motor ?

[phatcreators]

What are wound rotor motor & slip ring motor ?

Why slip rings are used ?

 

[tpetar]

A wound-rotor motor is a type of induction motor where the rotor windings are connected through slip rings to external resistances. Adjusting the resistance allows control of the speed/torque characteristic of the motor. Wound-rotor motors can be started with low inrush current, by inserting high resistance into the rotor circuit, as the motor accelerates, the resistance can be decreased.

https://en.wikipedia.org/wiki/Wound_rotor_motor

 

[phatcreators]

A wound-rotor motor is a type of induction motor where the rotor windings are connected through slip rings to external resistances. Adjusting the resistance allows control of the speed/torque characteristic of the motor. Wound-rotor motors can be started with low inrush current, by inserting high resistance into the rotor circuit, as the motor accelerates, the resistance can be decreased.

https://en.wikipedia.org/wiki/Wound_rotor_motor

So why not its the obvious choice instead of VFDs ?

why not we always use slip ring motors ion applications where we need VFD ?

 

[rfredel]

Hello phatcreators,

slip rings need maintenance. This is more high in price than VFD and VDF is modern technology.

Slip ring motors are use for big cooling - or ice machines, for big fans and so on. These motors are strted one time and then they have to run a long time. For this application it is cheaper than VDF.

regrads

Rainer

 

[phatcreators]

Hello phatcreators,

slip rings need maintenance. This is more high in price than VFD and VDF is modern technology.

Slip ring motors are use for big cooling - or ice machines, for big fans and so on. These motors are strted one time and then they have to run a long time. For this application it is cheaper than VDF.

regrads

Rainer

what do you mean by that ? Are these motors used for ice machines and for big cooling machines only ? Or for using these motors we required big cooling fans to cool down the slip ring motors ?

 

[rfredel]

Hello phatcreators,

I mean for example, that slip ring motors are use for very big compressor units in industrial cooling maschines or in ventilation systems for mining or tunnel systems. There you don't need VFD because you only start the motor by hand and then it runs for a long time.

Regards

Rainer

 

[phatcreators]

Re: What are wound rotor motor & slip ring motor ?

Hello phatcreators,

I mean for example, that slip ring motors are use for very big compressor units in industrial cooling maschines or in ventilation systems for mining or tunnel systems. There you don't need VFD because you only start the motor by hand and then it runs for a long time.

Regards

Rainer

Where there step motor is used with this setup to increase and decrease the speed ?

 

[felixmtt]

A wound-rotor motor is a type of induction motor where the rotor windings are connected through slip rings to external resistances. Adjusting the resistance allows control of the speed/torque characteristic of the motor. Wound-rotor motors can be started with low inrush current, by inserting high resistance into the rotor circuit, as the motor accelerates, the resistance can be decreased.

https://en.wikipedia.org/wiki/Wound_rotor_motor

Hey tpetar thanks for the information. Slip ring motor has wide usage including Army / Defense. Even the Slipring suppliers are few to count on.