I have a motor controller that outputs a Pulse Width Modulated signal. Though, this works just fine, it induces substantial amount of noise on nearby wires. So I was hoping to convert the PWM signal to an analog DC signal. The PWM signal is 60HZ and 36V. i.e. to run the motor at 50% of its speed I would have to send a 18V signal. What is the best way to get this done, with good response time and less noise. Thank you for your help.
sorry about that. I will try to explain this in a different way. This circuit will go in-between a motor controller (that outputs pulse width modulated signal) and a DC motor. So, instead of a square wave reaching the DC motor, I want a linear voltage to reach it. So if the PWM signal is on/high for 10% of the time, the corresponding linear voltage should be 3.6V(10% 0f 36V). thus producing the same effect on the DC motor. hope I made myself clear!
Thanks Pilko. The frequency is 60Hz, the voltage is 36V and the current rating of my motor is 3 Amps. I would like to keep the ripple current as low as possible. What are the values that you would suggest?
I need the motor to go forward and reverse. So the polarity of the input will change. Can I fix this just by adding another inductor on the bottom rung of the circuit?
ok then. To answer your previous question. we use a servo motor. so what changed should i make to your original circuit to be able to drive the motor in both the directions.
Is the PWM you are trying to smooth, the main supply to the motor or the trigger pulses, if the latter, the pulses are required for positioning of the servo.