Decyphering an old fan motor

[HannoB]

Hi guys

Someone gifted me an old fan motor. I want to turn it into a rudimentary drill bit sharpener. It is however giving me a difficult time in trying to figure out how to wire the thing. The nameplate is faded beyond readability.

It has six wires, and came along with two capacitors, one 24uF and one 3uF (both rated 400V ac)

I've attached the diagram of winding resistances I've measured.

I'm assuming it is a PSC (Permanent Split Capacitor) type motor, common for fan motors.
Questions:

• Which of the coils would be the start winding?
• Is there a right and wrong direction for the shaft to turn?
• Would excluding the 3uF cap cause any serious loss of efficiency?

This is a bit of a tinkering around project. I find these PSC motors quite intriguing. Any assistance is much appreciated.

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[HannoB]

This is how I've currently wired it - supplied by a Variac with constant amp monitoring to ensure I don't burn any windings.

It does rotate, however the moment I remove the capacitor from above circuit the rotor stops turning, which -according to my knowledge- should not happen as the "start winding" is only there to facilitate a slight phase angle difference to cause directional starting torque?

Am I missing something?

A good start would be to know if I'm even using the correct winding as the "Start winding"

[Doctorandus_P]

PSC = Permanent Split Capacitor, and this motor type is designed to be connected to a capacitor for it's whole life.