RE: [CAD_CAM_EDM_DRO] the L6203 & L297 circuit heats up stepper when not clocking?

Hi Tony,

I agree with you but I'm surprised that you haven't been shot down by god
yet. Quoting from a previous posting on this list:

<QUOTE>
Were he not, you would be confronted with a
motor that got colder with increasing load. :-)

1) An unloaded motor draws power from the power supply.

2) All the power drawn must dissipate as heat in the motor (There is
no load to deliver power to).

3) Applying a load to the motor means the load is absorbing power.

4) If input power does not increase with load, then the power
absorbed by the load must be subtracted from the power the motor is
dissipating as heat.

5) If (4) is true, the motor must get colder with increasing load.
Doesn't happen in real life.

<END QUOTE>

Or perhaps it's just me that attracts the wrath (and the gibberish).

John Dammeyer

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Tony Jeffree
> Sent: Friday, October 28, 2005 10:19 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] the L6203 & L297 circuit heats
> up stepper when not clocking?
>
>
> At 19:57 26/10/2005, you wrote:
> >The motor heats up
> >even when stopped
>
> They do. Steppers typically run hot when they are operated at
> full current
> - in fact they tend to run cooler when running than when
> stopped unless
> your driver has an option to reduce current when the motor is idle.
>
>
> Regards,
> Tony
>
>
>