Help identifying small electric motor. 2

[JNAC91]

Hi all,

I've been trying for some time now to figure out how and what these motors are.

As it stands I believe they are some kind of 4 pole permanent magnet DC motor with an encoder but I could be horribly wrong.

https://drive.google.com/open?id=0B-klP1ZPYxG2eWgyTmx2MWtpNkE

There are some photos in this google drive folder.

I have a box full of these so it would be great to know what to do with them.

Thanks in advance.

 

[MikeHalloran]

I don't see a permanent magnet.
Does any part of it attract a feeler gage when it's off?

I see six coils on six poles, fed by three wires.
Which suggests that it's a three-phase motor.
... with an encoder attached to the non drive end.

Which comprises, with a separate control circuit board, a brushless DC motor.

You need to find a box of circuit boards with matching connectors or cables.



Mike Halloran
Pembroke Pines, FL, USA

 

[JNAC91]

Thanks for that.

The magnets are on the shaft. The grey cylinders.
Image 113543 is the shaft with the magnets and bearings etc.

 

[ScottyUK]

Yeah, almost certainly a brushless DC motor. It's effectively a synchronous motor, and relies on the external driver to provide the three-phase AC supply to it.

 

[jraef]

SMI on the label generally means Smart Motor Interface, a standard developed by Moog for controlling servo motors. More people than Moog make SMI compatible motors, but that's a clue that what you have is a PMDC servo motor that can be controlled via an SMI compatible driver / amplifier. Some SMI motors have the amplifier built in, like Animatics, but those look too skinny for that. It's likely a custom OEM motor for a narrowly specific purpose, the pulley on the end suggests a fogged belt, but if it's now totally divorced from its driver you will be hard pressed to find a way to make it work.


"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington

 

[OperaHouse]

Too costly for you to use? Venture onto RE and windmill sites. There is a ready market for this type of motor.

 

[JNAC91]

Thanks everyone.

OperaHouse - This could end us being my only option short of recycling them. What would I use to draw attention to them in that circle? Should I call it an SMI PMDC Servo or just a PMDC motor?

I've had a multi-meter across the wires that come off the winding and when I spin the motor I get spikes in the voltage when starting and stopping but nothing during rotation. I was spinning it with a drill so I wouldn't think speed was an issue.

 

[3DDave]

Did you measure AC voltage or DC voltage?