[mowbot] [OT] Driving 6v DC motor with 12v power supply

adamdb nospam at juno.com
Mon, 17 May 1999 10:29:52 -0500

Can I drive a 6v DC motor with a 12v battery by using PWM and a 50% (or
less) duty cycle? How will this affect the life of the motor?

Is there a rule of thumb for the frequency to use? I was going to use a
PIC for control and the timer overflow interrupt, thus giving a frequency
of 4 KHz. Does this seem reasonable or should the frequency be higher or
lower (in general).

By the way the motors in question are from a kids sidewalk car and I'm
sure are just standard DC motors (not the newer coreless motors).


Adam Bryant (age 0x23)
abryant nospam at peaktech.com (work)
adamdb nospam at juno.com (home)
Parker, CO, USA
Robotics, RC Airplanes, anything using a PIC

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