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2 Questions about electric motors

M

Michael

Hi,

1.
I have a 36v motor that i need to control. I thought abouit using multiple
6v batteries, then stepping up the voltage. Would this damage the motor?
2.
At what level is it best to run a motor at, in terms of % if stall was 100%?

Thanks

Michael
 
D

Don Kelly

----------------------------
Michael said:
Hi,

1.
I have a 36v motor that i need to control. I thought abouit using multiple
6v batteries, then stepping up the voltage. Would this damage the motor?
2.
At what level is it best to run a motor at, in terms of % if stall was
100%?

Thanks

Michael
---
How you control the motor is somewhat dependent on how large it is and what
you are using it for. You can get crude step control by using 3,4,5, or 6
batteries in series- for small motors. At lower voltages, the control will
not be particularly effective as the available torque drops. A source of 36
to 40V with an electronic control will work well or, if the motor is small
enough (and a 36V motor may well be too large) use of resistance control.
I assume that this is a permanent magnet DC motor or you can separate the
field from the armature circuit if a shunt motor.

As for the level of operation - depending again on the motor, the best
operating point is at a load well below stall -say under 30% of stall
torque. It depends on the motor characteristics and type but for a PM DC
motor or separately excited motor, the peak power output will be at about
50% of stall torque and current.
 
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