Re: PS for PWM-controlled motor
- From: "Richard Torrens (News)" <News+14640@xxxxxxxxxxxxxx>
- Date: Sun, 31 Jan 2010 19:37:32 +0000 (GMT)
In article <hk3e2v$cu3$1@xxxxxxxxxxxxxxxxx>,
pimpom <pimpom@xxxxxxxxxxxxxxx> wrote:
I don't know if this should be in seb rather than in sed, but
here goes. I have this brushed motor from an old machinery with
an integral reduction gear. The label has faded completely so
that it's impossible to read the nameplate ratings. It was
powered from a transformer that outputs 26.5V at no load, and
judging from the orginal control board, it was apparently run by
phase control at mains frequency with a pair of SCRs. The current
limiting jumper was set at 3A. The transformer is rated for 90VA,
secondary dc resistance is about 0.2 ohm and primary (230V) 12
ohms.
I'd like to try using the motor and the transformer with
high-frequency PWM control, but if I rectify and filter the
transformer output, the supply voltage will be substantially
higher than the average in the original scheme (though of course
no higher than the peak). Is this likely to cause any problems?
Please ignore any other issues for the time being.
Lots on 4QD site about this:
e.g.
http://www.4qd.co.uk/faq/bmnc3.html#machtools Mains use - (Machine Tools)
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