Electric Motor Test Set
Electric Motor Test Set
(OP)
My company wishes to buy a high power electric motor test set. The major players provide a choice of regulation:SCR or variable transformer. My question for the experts, which is better? Pros and Cons?
Thank you for your input.
Bill
Thank you for your input.
Bill





RE: Electric Motor Test Set
The variable transformer raises/lowers the voltage and still keeps a sinusoidal waveform but at a reduced amplitude.
Is your SCR a saturable core reactor, or a silicon contolled rectifier? I'm assuming saturable core reactor. The reactor has a DC winding that carries an electrical current that saturates the iron core. This varies the impedance of the reactor thus creating a variable reactor. It works kind of like a rhoestat, but with AC impedance rather than ohmic resistance.
I believe the power factor on the SCR would be a little worse and the waveform of the AC probably would be a bit distorted, but I'm not entirely certain. The reactor has no moving parts but requires a power supply versus the variable transformer which requires a mechanical operation.
What voltage are the motors you are testing?
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If it is broken, fix it. If it isn't broken, I'll soon fix that.
RE: Electric Motor Test Set
Or ac hi-pot? Or dc? Or power factor test? Or... ?
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RE: Electric Motor Test Set
RE: Electric Motor Test Set
Also, if you need AC, it is highly unlikely that SCRs will be used since they either produce DC or low-frequency AC (cycloconverters). Or, perhaps, a "dimmer" type phase controlled output. The latter could perhaps work for no load tests, but then only as a soft starter. No speed control possible.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Electric Motor Test Set
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If it is broken, fix it. If it isn't broken, I'll soon fix that.