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Foot mounted 660VAC,50Hz,37kW CT Motor operated with a VFD

Foot mounted 660VAC,50Hz,37kW CT Motor operated with a VFD

Foot mounted 660VAC,50Hz,37kW CT Motor operated with a VFD

(OP)
Hi

Can I operate a 660VAC,50Hz, 37Kw foot mounted -CT motor with a VFD ?
Are these any special motors in terms of their construction, protection etc ?

Regards

RE: Foot mounted 660VAC,50Hz,37kW CT Motor operated with a VFD

As long as the windings are "VFD-hardened" and you take precautions to avoid EDM in bearings.

Unusual spec, 660 is 690 these days. At least in EU. So, this may be a pre-1995 motor.

Then it may not be able to work (for years) with a VFD. Better talk to the manufacturer about that. We do not have all the facts.

A picture of the name-plate could help.

Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

RE: Foot mounted 660VAC,50Hz,37kW CT Motor operated with a VFD

VFD duty motors need VFD duty stator windings and an independent fan for cooling since shaft mounted fans are useless at lower speeds. Does CT motor mean Cooling Tower Fan motor?

Muthu
www.edison.co.in

RE: Foot mounted 660VAC,50Hz,37kW CT Motor operated with a VFD

CT = Constant Torque maybe?

I agree with the others, we don’t know enough about that motor and the real people to ask regarding inverter operation is the motor mfr.

Or, you could invest in what’s called a “sine wave filter” to go on the output side of the VFD, then add “shaft grounding bushings” to the motor as well as a separately powered cooling fan, that way even if it is not meant for VFD operations it will survive longer. You may find though that all of those measures will end up exceeding the cost of just replacing the motor with one designed for inverter operation.


" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

RE: Foot mounted 660VAC,50Hz,37kW CT Motor operated with a VFD

(OP)
Hello

Thanks everyone for your input.

As regards the motor, it is available with the manufacturer. This requirement is for Russia.But do agree that it is too much hassle and cost, instead would make more sense to purchase a VFD driven motor. I hope VFD motors for my spec do get manufactured.

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