flash between rotor and stator
flash between rotor and stator
(OP)
we have a permanent magnets rotor, in a syncronous motor, (40 poles), the stator is three phases, and we start it with a v/hz device, in order to use a change into frequency and start it till the nominal spèed, we start with 3 hz and it start to move, but it start to do some noise and between stator and rotor (permanent magnets) there´s some flash... does somebody have some idea why it occurs?





RE: flash between rotor and stator
RE: flash between rotor and stator
other of my thinkings, is like i use an open loop system, as the motor is syncronous, maybe i select 2 or 3 hz, on the output from the VDF, but the real speed from the motor is 1 hz or 2,5 hz that means some slip and some voltage induction...
other point, is that the gape is no the same from the magnets to the stator core, for this.... maybe i have some ripple or corona effect.
what do you think about this....
RE: flash between rotor and stator
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If we learn from our mistakes I'm getting a great education!
RE: flash between rotor and stator
RE: flash between rotor and stator
Bill
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"Why not the best?"
Jimmy Carter
RE: flash between rotor and stator
A quick search turned up this thread:
http://www.eng-tips.com/viewthread.cfm?qid=102205
RE: flash between rotor and stator
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If it is broken, fix it. If it isn't broken, I'll soon fix that.
RE: flash between rotor and stator
RE: flash between rotor and stator
i think i need a better VFD, that could see the motor parameters, and with current and voltage know where are the rotor... and all of this in a open loop....driven a syncronous motor....
thanks for your time