2 Phase Servo Motor Question
2 Phase Servo Motor Question
(OP)
I have an AC, 115V, 2 phase, 60HZ servo motor system that I need to run on 50HZ.
Would lowering the frequency and leaving the voltage the same create a problem?
Would lowering the frequency and leaving the voltage the same create a problem?
Ron Volmershausen
Brunkerville Engineering
Newcastle Australia
http://www.aussieweb.com.au/email.aspx?id=1194181





RE: 2 Phase Servo Motor Question
The magnetizing current (assuming an induction type motor) will go up. That means that total current will go up as well. But not much, since saturation does not set in at so small voltage differences.
For PM motors, the load angle will increase to acommodate for the higher V/Hz ratio. This means lower PF and also higher current.
If your servo is not near thermal overload when run on 60 Hz, I think it will do quite well on 50 Hz. But check temperature vs all possible load cycles before letting customer have it.
OTOH a small autotransformer costs next to nothing.
Only problem then is that your speed will be 83 % of 60 Hz speed. That is true also w/o autotransformer.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: 2 Phase Servo Motor Question
Curt Wilson
Delta Tau Data Systems