Re: Feedback Speed Controls for RSGs, etc.

• To: tesla-at-pupman-dot-com
• Subject: Re: Feedback Speed Controls for RSGs, etc.
• From: "Marco Denicolai" <Marco.Denicolai-at-tellabs.fi> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Mon, 08 Mar 1999 11:46:50 -0700
• Approved: twf-at-verinet-dot-com

Just a couple of points:

- using an SCR (not a triac) will limit your motor speed to about 80% (if I
remember well) of its top value.
- every kind of feedback (even your back EMF feeback) is better than open
loop.

Regards





tesla-at-pupman-dot-com on 05.03.99 23:00:15

To:   tesla-at-pupman-dot-com
cc:    (bcc: Marco Denicolai/MARTIS)
Subject:  Feedback Speed Controls for RSGs, etc.




Original Poster: "Steve Young" <youngs-at-konnections-dot-com>

Marco and other listees,

Many years ago I built a simple feedback speed control for an electric
drill.  It has worked well and I still use it. I don't think it will help
stabilize RSG speed much better than an open loop lamp dimmer does.  The
feedback increases duty cycle of power to a universal motor as the load
increases, maintaining fairly constant RPM.  But it does not apply braking
power to the motor when the load is reduced, so the motor just "coasts"
down in RPM.  With a big flywheel as in a RSG, you might save a bit of time
accelerating the motor up to speed, but not slowing it down.

<BIG SNIP>

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