As a follow-up to my own post, it occurs to me that this must be a common
feature of electric car designs.

Foster

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of adastra
> Sent: Monday, August 06, 2001 3:45 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: DC-PM motor, speed vs torque?
>
>
> Reposted with correct message header.  (Thanks, James)
>
> We are working on a (PIC driven) application which uses a 90 Volt DC-PM
> motor. In some circumstances we want to lower the speed to about
> half of its
> full-scale value, but we still need the torque we get out of the motor at
> its full speed. Of course we can lower the speed by lowering the DC drive
> voltage, but it seems that the torque also falls off
> proportionately to the
> lowered voltage.  Does anyone know of a control technique (PWM
> maybe?) that
> allows lowering the speed while maintaining the torque?  I am
> obviously not
> a motor expert.  Am I trying to break the laws of physics here?  Any
> suggestions welcome. Thanks very much,
>         Foster
>
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