PWM Signal
- Thread starter bctang
- Start date
Hi,
Unless this project is some kind of challenge, it sounds over-elaborate. Pulse-width modulation, as applied to motor control, is simply applying current through the motor windings for some part of the pulse period. Full modulation is 0% (no current) to 100% (current flows for the entire period).
Using a microcontroller, it's only necessary to produce an on-off waveform. Say you have a time period in which an internal counter can do 128 counts. If your error signal can control the number of counts that allow the output to be high in each period, you have the means to give better than 1% control over the motor. Generating multiple waveforms to do the controlling, or even establish the basis for the PWM pulse period sounds like a lot of trouble to go to.
Unless this project is some kind of challenge, it sounds over-elaborate. Pulse-width modulation, as applied to motor control, is simply applying current through the motor windings for some part of the pulse period. Full modulation is 0% (no current) to 100% (current flows for the entire period).
Using a microcontroller, it's only necessary to produce an on-off waveform. Say you have a time period in which an internal counter can do 128 counts. If your error signal can control the number of counts that allow the output to be high in each period, you have the means to give better than 1% control over the motor. Generating multiple waveforms to do the controlling, or even establish the basis for the PWM pulse period sounds like a lot of trouble to go to.
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