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From: Mike Poulton
Subject: Re: DC Injection Brake for Induction Motors???
Date: 2 Oct 2002 00:01:10 GMT
Organization: MTP Technologies
On 01 Oct 2002, Kevin McMurtrie said:
> It depends on external current limiting. The voltage cycling of AC
> limits how strong the magnetic field will become and how much current
> will flow. DC is limited only by coil resistance. A big AC motor may
> have a winding resistance of under 1 ohm. Apply 120-something volts
> DC to that and it stops _very_ quickly.
> I tried it with a box fan motor once and it locked up hard. It surely
> would have broken something if the blades had been attached.
Ah. I figured current would be limited to some reasonable value. I
guess if your motor can take the high current for the amount of time
necessary to stop the load, then you can just hook it up to rectified
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