Re: [CAD_CAM_EDM_DRO] Philips Washing Machine Motors

Hi Jon,

We have written about these motors before over 12 months ago. A University
course got in the way and brought workshop machinations to a halt.

They are in fact brushed DC. While I accept that they may be slow in
operation you have confirmed that they will work many thanks. I got them
free from scrap machines so I didn't expect them to be perfect. I was
thinking along the lines of a 6:1 reduction with the encoders mounted on the
leadscrews.

I have a further question. What sized heatsinks will be required for the
Gecko 320's when used with these motors?

I still have the servo board of your design, which I will now not use. If
you have a use for it I'll be happy to send it back FOC.

Regards,

Terry


| You can't (at least I don't think you can). I'm pretty sure these are
| either brushless DC or AC induction motors. The Gecko drives are designed
| for brush DC motors. There are special retrofit brushless DC motors that
| have a special controller so they can be attached to servo amps for brush
| motors, but they are quite exotic and rare.
|
| Anyway, if I'm off base and these ARE brush motors, I think they are
| somewhat wrong for the application. Since you get only 75 W (roughly
| 1/10 Hp) at the low speed, you will need to gear down a bit. But, since
you
| need 200 V to get full speed out of the motor, you will have to live with
| about
| 4000 RPM, and you'll only get about 1/4 Hp peak (making some guesses).
|
| I'd try them with a DC power supply and see what sort of torque/speed you
| get at intermediate speeds, and decide what belt ratio to try. Something
| around 4:1 might be the best match. I should note that I'm using 1/8 Hp
| (continuous) rated motors, and going to 1/2 Hp or so peak, and these would
| leave most CNC machinists complaining about low acceleration and rapid
| traverse speeds. It's enough for me, though.
|
| Jon