Measuring rotor current in slipring motors
Measuring rotor current in slipring motors
(OP)
We are interested in measuring the rotor current of a slipring motor from zero speed to full speed and also at full load. Given that the frequency of rotor current changes from power frequency at start to slip frequency at full speed, what type of current measuring instrument one must use ?





RE: Measuring rotor current in slipring motors
What I found that works is a HALL effect clamp on amp meter.
If the rotor current is greater than the HALL effect clamp on amp meter, I have used current shunts. These work very well using the mV/amp conversion. The problem with the current shunts is an isolation issue, usually solved with battery powered equipment or isolation type probes on the osilloscope.
RE: Measuring rotor current in slipring motors
You have to have a Hall Effect amprobe.These instruments will measure down to 0 hz and anything in between.They are very common and reasonably inexpensive.I normally use HEMIs reading up to 1000 amps.Some types take multiple readings from 100/300/1000 amps .It is possible other scale combinations do exist in the market.
GusD
RE: Measuring rotor current in slipring motors
RE: Measuring rotor current in slipring motors
RE: Measuring rotor current in slipring motors
C R Magnetics, Inc.
544 Axminister Dr.
Fenton, MO 63026 2902
USA
Tel: 636-343-8518
Fax: 636-343-5119
http://www.crmagnetics.com/
or equivalent
RE: Measuring rotor current in slipring motors
We use some frequency converters in our WRMs.These devices are quite reliable to measure motor slip directly or speed if you so wish.They output a mA or mV signal for PLC control or any other required function.
GusD
RE: Measuring rotor current in slipring motors
http://www.thomasregister.com
and type Monitors: Voltage & Current under Product or Service, which will return 73 companies to approach to