Drives for single-phase ac motor control

[domcar]

Dear friends,
for my application I need to implement an AC single-phase induction motor speed control. The motor is low power (60W), permanent split capacitor, 220V.
I'm looking for drives OEM, but I found only the DigiDrive LP (Anacon Systems) that seems suitable. I ordered it 3 months ago but I haven't received.
Please inform me if you know other drives like DigiDrive LP.
Question:can I use (alternative solution)an inverter with three-phase output and connect the motor between two phase (all the inverters that I found have three-phase output).
Thank you in advance for your tips

 

[ScottyUK]

There is another thread running recently which had some notes on single phase motors running from VSD's. It would be worth you looking for it.

You can't use a PSC motor on a variable speed drive so far as I know, because the phase shift created by the capacitor is frequency-dependent, plus at low frequencies the capactior impedance rises to a large value and limits the winding current. Someone will no doubt correct me if I'm wrong.

You can't use a split phase motor either, because the centrifugal switch will energise the start winding below a certain speed and burn it out.




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Get it over with.

 

[aolalde]

For that power I suggest you should get a three phase induction motor and a VFD single-phase input, three-phase output. This way you will avoid messing with the capacitors in common single phase motors.

 

[SteveKW]

You don't need a fancy speed controller for a PSC motor if you have a variable torque load! (fan or centrifugal pump)

Simple voltage control would work (to a point)!
Mind you, you can only go lower than the rated RPM's.

 

[jraef]

Yes (to what SteveKW said), use a dimmer switch!

"Venditori de oleum-vipera non vigere excordis populi"

 

[jbartos]

Suggestion: Check with the manufacturer tech support if the dimmer switch output power quality will not negatively affect the motor windings, e.g. temperature, life-cycle, etc.