Speed control

[at01at01]

I am planning on controlling a motor which requires 12v 10a, i have the power supply and motor however need to control the speed of the motor.
What component would i need and what rating.

 

[MikeMl]

Vary the average DC voltage to the motor. That requires an adjustable (linear) power supply, or Pulse Width Modulation, where the power is turned on/turned off at a high rate (too high for the motor to follow it), but where the average value controls the motor speed.

 

[at01at01]

What circuitry would i need to do that consudering i have already purchased the power supply

 

[Diver300]

You can add a PWM switch quite easily. That will use the existing power supply.

A MOSFET is easiest to use and you need a freewheel diode. A large capacitor on the supply is a good idea. The motor inductance will keep the current nearly constant.

There are a couple of PWM circuits here:- Springers- automated percussion instrument by Godfried-Willem Raes - archive file

 

[ronv]

If you don't want to build one try one of these.

dc motor speed controller items - Get great deals on Business Industrial, Electronics items on eBay.com!

Do you need to be able to change direction or just speed?