questio answer

[markymark2406]

A friend of mine attended an interview to be a sparky at a factory, one of the questions he was asked was the following:

Whats the difference between a Delta and star wound motor and what are the applications for the use of these 2 motors?

My friend Frooze and didnt get the job.

 

[markymark2406]

 

[Taylortwocities]

Perfectly valid simple question as a lot of the plant may be 3 phase motors.

 

[markymark2406]

explain

 

[ricicle]

http://www.diynot.com/forums/viewtopic.php?t=101434

 

[RF Lighting]

explain

Where are your manners?

 

[markymark2406]

so can star/delta motors be in 240 or 400 volts?

 

[JohnD]

"a friend of mine"

 

[markymark2406]

thats an answer

 

[Taylortwocities]

Some motors can have a supply voltage of 11,000volts

That, of course, will be three phase.

Depends on the application. For example, some railway systems use a single phase AC voltage of 25,000V, 50 Hz.

 

[Spark123]

so can star/delta motors be in 240 or 400 volts?

Talking bog standard 400v 3 phase supply:
With Delta each winding of the motor is connected across 2 phases and has 400v across it.
With Star each winding of the motor is connected from a phase to the star point. The result of this is each winding having 230v across it.

 

[Softus]

"a friend of mine"

That right - his name is "Frooze and".

 

[tim west]

Used to work with 230v 3 phase motors, transformer stepped down

 

[Spark123]

Were they American?

 

[tim west]

They may well have been although not certain, they were fitted inside a "Heron" camera crane, Vinten who made the crane were/still are, a british company, the motor drove a hydraulic pump which in turn pressurised a reservoir which in turn drove a hydraulic motor.