Hello

I am currently making a bridge rectifier to convert AC to DC and connect the output to a motor, however, I need a circuit after the bridge rectifier to control the speed of a 15V DC motor. I am getting 19V output from the AC to DC converter.
This is the AC to DC converter with a capacitor to smooth the output.

I am still missing the motor control circuit and I need two aprooches
1. Using a variable voltage regulator.

2. Using a MOSFET switched supply.

I have managed to get this circuit but it's not working for some reason I am not sure if it's the software. or if the circuit is wrong can someone please clarify if the circuit is ok can control motor speed.
also, how can this achieved using a variable voltage regulator

Thanks


Thanks

 

in addition, the torque HP doesn't matter. all whats required is just two different circuits to control the motor speed.
One using a MOSFET switched supply and the other a variable voltage regulator

Thank

 

There is the simple 555 approach such as http://www.discovercircuits.com/DJ-Circuits/simplepwm2.htm
They are also available on ebay for a couple of $$'s.
Your circuit did not show up.
Max.

 

There is the simple 555 approach such as http://www.discovercircuits.com/DJ-Circuits/simplepwm2.htm
They are also available on ebay for a couple of $$'s.
Your circuit did not show up.
Max.

Thanks for pointing that out

What about now?

 

When using the 555/PWM type circuit to control a DC motor you do not need to size the supply to the motor voltage, in fact it is preferable to be ~10% above, min.
If using the DC supply with no control, i.e. direct on, you do not require a Capacitor across the bridge output on a 15vac supply.
Max.