Can you Identify this electric motor 1

[Mada head]

[/ignore]com/image/upload/v1521081485/tips/mmexport1521026840082_olgods.jpg]

Hello, Can anyone give me more information about this motor? It's an ac motor 3phase, with low rpm (about 100rpm under load ) ..I'm under the impression there is no gear box, so how would it be possible for an ac motor to reach such low rpm and enough torque to manage the load?

What type of motor is this?
Any well known manufacturers that use this design?

Thank you!

 

[waross]

That looks more like a clutch, a brake or clutch/brake combo than a motor. How about a picture of the nameplate?
Is it running?
Lots of poles means lower speed.
Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[dArsonval]

At 60 hertz, running at 100 RPM would mean that thing would have to have 72 poles in it.

Perhaps the box on top of the unit is its drive, and it has something more like
6 or 8 poles in the frame.

I'm with Bill, let's see a name plate.

An interesting piece of equipment, if it is indeed a motor.

John

 

[MikeHalloran]

Quite a while ago, there was a two-coil motor of very simple construction that was built and sold as a stepping motor, and as a low-rpm synchronous AC motor. It was <half the diameter of the motor in the photo (guesstimated, since size not specified, and no identifiable reference object is in the photo). The same proportions could appear on a 'pancake' motor, also sold in several variants.

The shell would not be useful around a brake, since it's not optimized for heat dissipation.
It would be ok for a low-duty clutch, but I don't see two shafts.
Maybe explostion proof?



Mike Halloran
Pembroke Pines, FL, USA

 

[LionelHutz]

Short length with a larger diameter could point to more poles and possibly even a permanent magnet rotor.

With the fins on the top box, I too would suspect that is a speed controller of some kind.

 

[Mada head]

I do not have a nameplate. This motor was seen on a farm in South East Asia. And that's correct if done by poles it would be 72 poles, is that possible? Practical?
The motor is about 15" diameter.
The box on top looks like some kind of drive, or maybe a cooling mechanism?

This motor is replacing what we would normally use 1.5hp 4 poles with a gearbox 1:17 gear ratio.

 

[Skogsgurra]

Could very well be a (switched) reluctance motor. They can easily be made with lots of poles. Does it emit any "funny" sound?

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[ScottyUK]

72 pole machines are certainly possible, but such high pole counts are usually only seen in big salient pole hydro generators. I agree with the others that the box on top is some form of speed controller, perhaps in conjunction with a relatively high pole-count motor (say 12 or 16 poles).

 

[MikeHalloran]

Here in The Colonies, "Farm Duty" suggests TENV and resistant to dust/grain explosions.
The fins on the control box are not big enough to dissipate a lot of heat, but modern controls don't need to dissipate much, so a kW or two of output is not impossible.

There's room for a planetary gearbox and a pancake/PM motor in that big shell.

I sent a link to the image and a link to the discussion to Grainger.
They haven't seen anything like it, either.




Mike Halloran
Pembroke Pines, FL, USA

 

[MikeHalloran]

Grainger tech says it's for marine use. But they don't have it, whatever it is.


Mike Halloran
Pembroke Pines, FL, USA

 

[roydm]

To be a clutch it would have to have a shaft at the other end.
Could also be a brake.
Looks as though just one end comes off.

 

[edison123]

A BLDC motor? The top unit looks like a decoder.

Muthu

http://www.edison.co.in

 

[Mada head]

Definitely not a bldc motor, it is running on 3 phase electric .

It's currently being used on fish farms, but I doubt it was designed for this. I've also been told that it's 30-40% more efficient than the tefc + gearbox solution that it's replacing.

It does not make any weird noises when running


Why would you think it's a clutch or brake?

 

[waross]

Clutches and brakes tend to have a similar length to diameter ratio, motors- not so much.
Also I made a mistake. At first I mistakenly thought that the frame extension behind the motor was a shaft extending from the back side of the device.
My bad.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[zlatkodo]

Probably it is about low speed PM motor (usually elevator motor, see the picture below).
Number of poles is depending on Hz applied.

Winding Design and Motor Repair

 

[edison123]

zlatkodo - I think you nailed it.

Muthu

http://www.edison.co.in

 

[flexoprinting]

Good morning

That resembles a Pancake motor design. We had similar smaller units on our printer rollers.

https://www.heinzmann.com/en/electric-motors/pancake/dc-motor

Chuck

 

[zlatkodo]

You can find the same kinds of motors in washing machines, electric bikes, wind generators, lifts etc..
Sometimes they are 3-phase, sometimes multiple phases ( 7 phases for washing machines).
More at:

[URL unfurl="true"]http://winding.wixsite.com/design/single-post/2016/11/26/3ph-Windings-for-PM-motors[/url]