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# AC / DC motor

## AC / DC motor

(OP)
Hi!

I am new here and I need some help. I am a student in Greece and I have a voluntary project for a water vortex and we want to use a motor. We prefer an AC motor with approximately 18000 rpm and 220V. We want this motor by Europe. Do you know where can I find one? I searched in Greek stores but there is nothing. Also, we prefer something cheap. If you have a better idea about the motor let me know.

Thanks a lot!

### RE: AC / DC motor

You mention AC/DC. Take a look at "universal" motors. You're going to need to list more specifications (power or torque, duty cycle) to get more help.

### RE: AC / DC motor

You are not going to get 18,000 revs out of an AC motor unless you provide it with 300 Hz
I believe aircraft use 400 Hz and some workshop tools like grinders run on a high frequency supply.

If you prefer using a universal motor consider a Vacuum cleaner, they run at very high speed.
Electric drill perhaps.

### RE: AC / DC motor

(OP)
Brian Thank you. I mentioned AC/DC because we don't have a problem using DC motor but we prefer AC motor. Our basic needs is the rpm and the voltage. Definitely we need large torque 600W or more.

### RE: AC / DC motor

(OP)
roydm thank you...

### RE: AC / DC motor

(OP)
Also we don't mind using universal motors. We need to find a cheap one in Europe. Do you know any store that has a motor like that?

### RE: AC / DC motor

A universal motor is the best choice for something that small and that fast. They are not going to be “off the shelf” items however. If this is a one-off experimental project, I suggest looking at small appliances that run at that speed. A home food blender comes to mind. Mine is adjustable from 500 to 37,500 RPM, so although I can’t see a readout of the actual speed, I’m sure 18,000 is in there somewhere. So if you find one like that with adjustable speeds, get a tachometer light and look at the square drive pin to adjust it to the right speed. After finding that speed, you can either adapt the drive pin to your device, or remove the motor and controller and design around it.

" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

(OP)
Thank you jraef

### RE: AC / DC motor

I see a few listed on Ebay - mostly sewing machine motors.

### RE: AC / DC motor

Chinese 2 pole AC induction spindle motors go 18,000 and are not as bad as their total junk VFD drives. Price is hobby level. Google those words. You can get a couple kw 18000rpm motors for $300.00 More info on forums like cnczone, practicalmachinist. Then if you want good industrial grade, Swiss made, check out EundA.ch - 600w probably about$ 1000.00

### RE: AC / DC motor

#### Quote (SophiaGal08)

...I am a student in Greece ...
Methinks budgets will be very very tight for our OP, hence my suggestion to adapt an appliance motor for a 600W load. I don't know if they have "thrift stores" in Greece, but I know for sure they have "flea markets" (I've been to some). That's where I would start if it were me.

Here's a video showing a blender being disassembled. They spend a lot of time looking at the buttons, but in reality, all they do is signal the little printed circuit board to limit the voltage getting to the motor, essentially the equivalent of a dimmer device for lighting. If you look past that to where they show the motor, there are two wires going to it. Those will be AC input to the universal motor and you can wire a dimmer to them to vary the voltage getting to the motor instead of that PCB. Just make sure the dimmer is rated for the wattage of the motor.

" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

### RE: AC / DC motor

I still think a vacuum cleaner would be a good place to start, they really motor.
Pick up an old one from a second hand store.
You may be able to get even higher speed by weakening the field independent of armature current.

### RE: AC / DC motor

Just beware of self-destruction by centrifugal force; a very stout shroud to capture all the flying pieces might be in order...

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

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