Tips/Techniques Speed Control?

Is it possible to just add speedo control (like possibly a dimmer control switch) to a (bench type) 120V milling machine, or does one need to purchase a 120V to 120V VFD?

Any help explaining what an actual VFD does other changing single phase to 3 phase.

Is there such a thing as a single phase to single phase VFD?

Thanks Brian

 

[DavidR8]

Is it possible to just add speedo control (like possibly a dimmer control switch) to a (bench type) 120V milling machine, or does one need to purchase a 120V to 120V VFD?

Any help explaining what an actual VFD does other changing single phase to 3 phase.

Is there such a thing as a single phase to single phase VFD?

Thanks Brian

A speed controller as used for a router will not work on an induction motor unfortunately.

A vfd will only work on a 3-phase motor as that’s what they are most commonly used for.

 

[Brian Lawrence]

Any suggestions for being able to control the speed on my machine?

 

[DavidR8]

Any suggestions for being able to control the speed on my machine?

If it has a 120v, single phase, induction motor the only option you have is to switch to either a DC motor with a speed controller or a 3-phase motor and a VFD.
What machine is it?

 

[Susquatch]

Any help explaining what an actual VFD does other changing single phase to 3 phase.

Way more than that.

1. It will also change the frequency from 60 Hz to slower or faster frequencies which in turn can change the speed of a 3phase motor.

2. It can provide safety circuitry essentially replacing a whole control box and its contents.

3. It can reverse a motor on the fly

4. It can provide smooth programmed acceleration and braking.

5. It can be controlled with various inputs to change the motors operation based on control inputs.

6. Those that have Sensor less vector control (SLV) can sense motor current and back emf to know the motors position at all times to compensate for slip and load for amazingly smooth operation.

And the list goes on. Maybe I forgot a big one.

Any suggestions for being able to control the speed on my machine?

Although it could be expensive, I favour a new 3ph motor and a VFD. Some folks might prefer a DC Motor and speed control.

It can be done. It mostly depends on your budget and/or willingness to search for an affordable motor.