Autistic has kindly identified the legacy motor I would like to recycle as a single phase asynchronous motor (see linked thread). Here is the internal schematic: enter image description here

(source thread)

I would like to control it with a cheap wireless controller I had bought from Carymart; the issue is that it has only 3 outputs: UP, COMMON, DOWN, as seen on the following diagram.

enter image description here


I assume the phase shift capacitor is neither in the motor nor in the controller, but a bigger problem is how to wire the 5 leads motor to the 3 leads controller.

I have found this page on the manufacturer's website which is about this exactly, and implemented it in the following schematic, but they haven't said anything about the capacitor. It cannot be an electrolytic type because the current flows in both directions, and since current is always flowing in the capacitor when the motor is running and that it runs for more than 1s (that's a pool cover motor, probably 1min of operation every time), apparently it's not a good idea to have two electrolytics back to back. So I'm stuck.

Therefore I need either a new arrangement, or a type of suitable capacitor. Please advise :)


simulate this circuit – Schematic created using CircuitLab

  • \$\begingroup\$ I suspect the controller is not suitable for the motor. \$\endgroup\$
    – user16324
    Mar 14, 2016 at 18:12
  • \$\begingroup\$ It's not a good choice, but the manufacturer has a blog article online which shows how to do that, my schematic is a direct application. However, they don't say anything about the cap, and I don't think I can use standard electrolytes because of this arrangement. Do you think it's impossible with this controller because of the cap? What about with some external relays? \$\endgroup\$
    – user42875
    Mar 14, 2016 at 18:20

1 Answer 1


Here is what I think that you need. The capacitor is a non-polarized electrolytic that is designed and sold specifically as a "motor start" capacitor.

enter image description here


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