Electric motor for a compressor.
Electric motor for a compressor.
(OP)
I working on sizing an electric motor to run a reciprocating compressor. We are in the 10kW range at 2000RPM, 45-50Nm. We are looking at frameless motors as they are light weight and have a small profile.
Someone told me that an electric motor will be eaten up by the reciprocating compressor since the torque goes from 50Nm to (-), acting as a brake when some of the air pressure pushes the piston back down.
He says at most it will last a year.
I'm wondering if anyone can confirm or shoot down this train of thought?
Someone told me that an electric motor will be eaten up by the reciprocating compressor since the torque goes from 50Nm to (-), acting as a brake when some of the air pressure pushes the piston back down.
He says at most it will last a year.
I'm wondering if anyone can confirm or shoot down this train of thought?





RE: Electric motor for a compressor.
I'd say if you correctly apply a new motor, it should last a long time.
There may be some application issues unique to recips that I'm not aware of, but someone should be along shortly to give you a better answer.
Cheers,
Dave
RE: Electric motor for a compressor.
RE: Electric motor for a compressor.
RE: Electric motor for a compressor.
If there were no outlet, then sure, you would have a significant re-expansion of the compressed air. I know it is traditional to have a large, heavy flywheel on a reciprocating compressor which would tend to help with your concern.
A 10 kW machine would surely have multiple cylinders so another piston could more than absorb any "negative torque" produced as a piston goes over TDC.
RE: Electric motor for a compressor.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Electric motor for a compressor.
RE: Electric motor for a compressor.
Mike Halloran
Pembroke Pines, FL, USA
RE: Electric motor for a compressor.
Bill
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