Re: Help! Smoking Motor;

["Bryan in San Jose Ca" <everuplate@eisa.com>]

A couple of unlikely scenarios, but why not ask?

What is the motor's inductance? If it's really low, the ripple current it is
exposed to may cause things to heat up. Usually not an issue...

Is the motor still "good"? Disconnect the motor/controller, and spin it up,
and read the terminals with a voltmeter. Anything coming out? Actually, it's
better to do this before anything is hooked up, so you can get an idea of
what it was Before the motor took up smoking. A volts/rpm can be taken, and
checked again for just such an occasion.

Has the magnets been partially demag'd? I presume that it's a 120A
controller by the number 24V 120. That's only 4x the continuous rating,
again, usually not an issue. If they have, it's going to suck more amps and
do much less, hence the smoking issue..




----- Original Message -----
From: J.R.Mcdonald <J.R.Mcdonald@wkac.ac.uk>
To: <ev@listproc.sjsu.edu>
Sent: Friday, March 31, 2000 6:09 AM
Subject: Help! Smoking Motor;


>
>
> I have just put a new motor on my e-scooter and when I wired it up
> and took it for a drive and it smoked.  It smelt of Flux and general
> electric burning smell.  The motor is a Bosch 24v 750 watt permanent
magnet
> motor and is being powered by two 12 v deep cycle batteries in series,
> through a scoota 24v 120 controller from 4QD.
>
> The motor is too hot to touch and keeps on smoking for a long period
> when the bike is not moving.
>
> Any body know what I can do?
>
>
> James
>
> -----Original Message-----
> From: PETER VANDERWAL [mailto:peterv@peoplepc.com]
> Sent: 13 March 2000 16:23
> To: ev@listproc.sjsu.edu
> Subject: Re: JM2000 electric scooter
>
>
> > I am in winchester in England if anyone knows of a British Controller
> > manufacturer.
> >
>
> 4QD is in England and they make some really nice PMDC motor controllers
that
> are VERY affordable.
>
> http://www.argonet.co.uk/education/4qd/index.html
>