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* if you r using simple dc motor then u can do the following : -
1) simple but inefficient method: connect it in series with a variac
2) PWM : i.e. giving it pulses
e.g. consider a motor is connected to dc supply of 5v
suppose we give pulses of say 5ms followed by a gap of 5ms then effectively we are giving the motor 2.5v continuous dc supply
suppose we give pulse of 7ms followed by a gap of 3ms then we are giving an effective dc supply of 3.5v
this can be implemented using a 555 timer or maybe also using counters with some ckt.
* in case of stepper motor u can easily control the pulses to get desired speed/position
hi rooftop.,,
iam sorry abt that the motor is a dc motor ...
hi alvarorahul..
the ideas oyu gave were helpful .may i know more bt thee following method---
"2) PWM : i.e. giving it pulses
e.g. consider a motor is connected to dc supply of 5v
suppose we give pulses of say 5ms followed by a gap of 5ms then effectively we are giving the motor 2.5v continuous dc supply
suppose we give pulse of 7ms followed by a gap of 3ms then we are giving an effective dc supply of 3.5v "
PWM (Pulse Width Modulation), the advantages of this tecnique is that you can control the speed of motor digitally.
Usually we used to give the motor higher voltage right to make it spin faster, you can also using potentiometer to control the current. But with PWM, it's little different.
If you using 5 volt continously it will be the same with using 12V using about 10% duty cycle...
Duty cycle simply is the ratio time to turn-on the motor and time to turn -off the motor.
Example, the output of your output will be like this:
-______-_______-_______-_______
if you want to make you faster then just give output like this:
------___------___-------___-------___
Is it clear now? You can use L298 for better application.
Best regards
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