Can I use this for a reversible AC motor?

[kjjordans]

I have a Chinese laser cutter with an AC motor like this that controls the up and down movement of the bed.

It is controlled by two momentary switches for one forward and one reverse.
I thought that I could use dcservo with two solid state relays to control the motor.

Am I out of my mind or do you think that it will work?

[misan]

Yes, you can, but you will need to add a variable frequency drive (VFD) which will make it an expensive proposition. Alternatively, you could use vESC or ODrive projects if you remove the capacitor from your motor, as it seems a regular brushless motor. None of these are cheap either, but they can do the job.

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On Fri, Apr 17, 2020 at 9:56 AM kjjordans ***@***.***> wrote: I have a Chinese laser cutter with an AC motor like this that controls the up and down movement of the bed. <https://camo.githubusercontent.com/0e4f3e34962ccee21e5e8c59a60dee9257f9ea86/68747470733a2f2f616530312e616c6963646e2e636f6d2f6b662f485442317031474158414830674b306a535a464e7136784d71585861352f323230562d41432d53796e6368726f6e6f75732d476561722d4d6f746f722d36384b54595a2d36382d4b54595a2d3238572d5065726d616e656e742d4d61676e65742d53796e6368726f6e6f75732d476561722d4d6f746f722d323230562d322e6a7067> It is controlled by two momentary switches for one forward and one reverse. I thought that I could use dcservo with two solid state relays to control the motor. <https://camo.githubusercontent.com/7d4d084db4869d599197350a8c83d1ff2ff8299d/68747470733a2f2f636f72652d656c656374726f6e6963732e636f6d2e61752f6d656469612f636174616c6f672f70726f647563742f63616368652f312f696d6167652f363530783635302f66653162636431383635346462313866333238633266616161663363363930612f632f652f636530353334372d322e6a7067> Am I out of my mind or do you think that it will work? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#66>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AADRZSBURQBTRK4IDL4RAWLRNADTNANCNFSM4MKRBE6A> .

[kjjordans]

Thanks for the quick response.
The motor is quite slow so I don’t think I need pwm. Just on and off would be enough. It might be easier to swap the motor for a stepper

[misan]

It all depends on the error you can accept. You can try with a dead-band to prevent constant oscillation (so the motor is not activated until the output signal is higher than a given threshold).

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On Fri, Apr 17, 2020 at 11:58 AM kjjordans ***@***.***> wrote: Thanks for the quick response. The motor is quite slow so I don’t think I need pwm. Just on and off would be enough. It might be easier to swap the motor for a stepper — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#66 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AADRZSFIMWVSLTHEMQUJNYDRNAR5FANCNFSM4MKRBE6A> .