stannah stair lift cutter

[DrNik]

A household dimmer switch would slow your 240v motor, as long as its not over its current capacity

 

[kier]

A household dimmer switch would slow your 240v motor, as long as its not over its current capacity

would it not cut the power though

 

[hotrodder]

It would. Don't know nearly enough to even guess why your PWM didn't work as i've only got experience of them with DC motors and i don't really know what i'm doing there either. Just that it works but gets 'notchy' at low rpm when you have a blonde moment and connect the motor brake through the PWM as well as the motor

If the motor is 33rpm at the moment then halving that would be a good start (as 16.5rpm is more than enough for a swager) and cheap to do if you can cobble some fittings together to make use of say a cam belt or chain pulleys/sprockets. Bicycle chain and sprockets would be another way and make it easy to mess with ratios. That'd give the motor a chunk more torque which in turn might make the loss of torque from a dimmer switch or your current PWM set up tolerable?

 

[kier]

It would. Don't know nearly enough to even guess why your PWM didn't work as i've only got experience of them with DC motors and i don't really know what i'm doing there either. Just that it works but gets 'notchy' at low rpm when you have a blonde moment and connect the motor brake through the PWM as well as the motor

If the motor is 33rpm at the moment then halving that would be a good start (as 16.5rpm is more than enough for a swager) and cheap to do if you can cobble some fittings together to make use of say a cam belt or chain pulleys/sprockets. Bicycle chain and sprockets would be another way and make it easy to mess with ratios. That'd give the motor a chunk more torque which in turn might make the loss of torque from a dimmer switch or your current PWM set up tolerable?

I think you are right I will look around the farm and see what I can find in the way of pulleys first

 

[kier]

here is what Iv'e found and the pavalux motor with 3 1/2" pulley
and a nice double picador 8" pulley
also a 2 1/2" pulley
turned the picador centre out to 25mm to fit swager shaft
the picador was on the useful looking shaft with bearings

 

[WillP]

Just to let you know, you cant use a PWM to change the speed of an induction motor. it will just get hot and stall easily. Any brushed or 'universal' motor will be fine, like whats on hand held tools etc. A wheel chair motor and a few car battery's might be easier?

 

[kier]

Just to let you know, you cant use a PWM to change the speed of an induction motor. it will just get hot and stall easily. Any brushed or 'universal' motor will be fine, like whats on hand held tools etc. A wheel chair motor and a few car battery's might be easier?

Thats where I was going wrong! thanks for that, think I might have the gearing about right now with the pulleys, didn't want to use wheel chair motors as their 24v and I would need 2 batteries