Re: [CAD_CAM_EDM_DRO] Digest Number 3836

> Message: 10
> Date: Mon, 5 Jul 2004 15:15:25 -0700 (PDT)
> From: Larry Wright <lnw32@...>
> Subject: Re: Re: Power Supply
>
> --- Ron K <godsone@...> wrote:
> >
>
> There is something I read that is very important to
> the point of running stepper motors at current levels
> above there rating.
>
> What I read says that every time the current level
> exceeds the rated level it has the effect of
> demagnitizing the motor,deterorating the torque that
> the motor is capible of.
>
> I can't say that this is true for all motors or at
> all, but I read it. If there is a magnet inside the
> motor it makes sence.
>
> Larry Wright

What damages the motor is heat. It is the I^2*R (the current squared times
the motors winding resistance) heat dissipation (in watts) of the motor.
This heating is at the highest when the motor is stalled. It is the HEAT
that demags a motor. Some magnets are more heat resistant then others.

Jeff Martin