Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: rkdygert on December 06, 2007, 08:05:24 PM

Title: Pairing motor with sensorless vector drive
Post by: rkdygert on December 06, 2007, 08:05:24 PM

I have a potentially stupid question to ask...

What do I need to consider when pairing a motor with a VFD?  Specifically, I have a couple vector drives, specs here: 

http://www.geindustrial.com/products/buyersguide/Sec_12AF-300E$.pdf

they are 5hp GE sensorless vector drives.  What do I need to look for in a motor to take advantage of the vector benefits of the drive?  I read in the manual that it needs to be a 2, 4, or 6 pole motor...anything else?

Thanks,
-Ryan

Title: Re: Pairing motor with sensorless vector drive
Post by: KTM on December 07, 2007, 03:35:58 PM

It depends on what you would like to us the drive for.
If you only require it for the spindle at close to synchronous speed then you can use a normal motor,
but if you are using it for a low rpm, high rpm or constant start/stop operation then it is better to use an inverter motor
which has seperate windings for the cooling fan or use an external cooling fan - at high rpm the motors fan will draw higher
current from the motor and may even stall the motor.

Regards

KTM