Re: Induction motor anti-loading

From: Tim Wescott (tim_at_wescottnospamdesign.com)
Date: 10/25/04 

Date: Mon, 25 Oct 2004 13:44:05 -0700

Rich Grise wrote:

> On Mon, 25 Oct 2004 15:27:41 +0100, Paul Burke wrote:
>
>

> So, say the escalator is the only electric thing operating in the
> store, going down, and the power meter is reading out the quiescent
> current of the assembly, right? Now the football team - heck, make
> it the weightlifters, carrying their dumbbells or whatever - they're
> pulling the motor like you've described, they start generating -
>
> Does the store's electric meter start running backwards? Or at least
> slow down? _Could_ it be made to run backwards with something this
> conceptually simple, with enough mech. power input?
>
> Thanks,
> Rich
>

First: Yes, in theory you could have power coming out of the escalator
motor. This would depend on the escalator being fairly efficient, even
with a lot of weight on the tread (and they're being claimed as fairly
inefficient in another thread). You could design your escalator to
harvest power this way, but chances are that with a real one the
friction would go up faster than the power input but you never know.

Second: In theory the meter could run backwards, but it would have to
be designed for it. It's more likely that it would simply not register
the power out, or that it would hang. 

-- 
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

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