Using a fixed resistor with a DC motor

Thread Starter

awwwt

Joined Aug 24, 2015
60
Hi everyone,

I have recently been tinkering with some basic analog components in order to get a better understanding of entry level electronics and circuitry. I am learning about small (1.5-3v) DC motors at the moment and was wondering about using resistors to slow them down. I've been trying different (low) resistor values to vary the speed of a motor and it works the way I expect, but I was wondering, granted you do not need to use the torque of the motor to carry any heavy weights or anything like this, is the practise of using a resistor to slow DC motors down generally acceptable within electronics?

As I come from more of an Arduino background I know you could use PWM which is possibly more efficient, but I am interested in the specifics of just using analog circuitry :)

Thanks very much!
 

MaxHeadRoom

Joined Jul 18, 2013
28,510
A resistor is not practical to control a motor, the current is always changing due to a variation in load, IF you could guarantee a super steady load, you may get away with it, but not recommended, plus a energy waster.
Max.
 
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