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Drives for single-phase ac motor control

Drives for single-phase ac motor control

Drives for single-phase ac motor control

(OP)
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

RE: Drives for single-phase ac motor control

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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RE: Drives for single-phase ac motor control

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.

RE: Drives for single-phase ac motor control

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.

RE: Drives for single-phase ac motor control

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

"Venditori de oleum-vipera non vigere excordis populi"


RE: Drives for single-phase ac motor control

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.

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