Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: markn on November 18, 2009, 08:48:24 PM

Title: Motor/driver ID
Post by: markn on November 18, 2009, 08:48:24 PM

Hi Guys,
I have a AC Servo motor, labeled Velconic AC Servo, the motor has 3 power leads and also what appears to be an encoder attached to the end. The encoder shell has 7 twisted wire pairs on the wiring harness, when I rotate the shaft by hand it "cogs" almost like a stepper motor.. The model # is RA13M1-0200E 13M1-0200E. Anyone know type of motor this is and what sort of drive it would need?

Thanks

Title: Re: Motor/driver ID
Post by: Hood on November 19, 2009, 07:41:51 AM

It is  an AC Servo, does the cogging only happen at three or four points? If so than that is the amount of pole pairs it has.
You would need an AC or Brushless DC drive for it, what make/model will all depend depend on the current and voltage ratings.
Hood

Title: Re: Motor/driver ID
Post by: markn on November 19, 2009, 09:00:37 AM

Hi Hood,
The cogging action feels more like every 1 degree, almost like a MPG.

Thanks, mark

Title: Re: Motor/driver ID
Post by: Hood on November 19, 2009, 09:08:44 AM

Well it kind of sounds like the bearings are shot, an AC servo should rotate fairly smooth but you would feel a slight but definite pull as it gets near a pole.

Title: Re: Motor/driver ID
Post by: markn on November 19, 2009, 09:15:19 AM

Hi Hood,

No the feeling is not like that of a bad bearing at all, the motor shaft rotates smoothly. I think there must be some kind of magnetic stator.

Thanks

Title: Re: Motor/driver ID
Post by: Overloaded on November 19, 2009, 09:26:17 AM

The AB "N-Series" motors are very similar to this...sort of like a very coarse stepper but a bit softer between the detents.
They call it a "ring magnet rotor construction" motor.

Title: Re: Motor/driver ID
Post by: markn on November 19, 2009, 09:35:33 AM

Yes, That describes it perfectly. So what sort of driver is required?

Thanks

Title: Re: Motor/driver ID
Post by: Overloaded on November 19, 2009, 09:38:27 AM

Like Hood said....you need to get more info on it.
Also, the type of commutation required.

Title: Re: Motor/driver ID
Post by: Overloaded on November 19, 2009, 09:52:14 AM

A quick search only showed 2 Velconic amplifiers/drives.
Only about $200 difference in price.
Here is the higher $ of the 2.
RC

Title: Re: Motor/driver ID
Post by: Hood on November 19, 2009, 09:55:37 AM

Seems like its Toshiba, found some info on their Australian site but not for these motors. :(

Hood

Title: Re: Motor/driver ID
Post by: Hood on November 19, 2009, 10:06:43 AM

Might be worth calling or mailing these guys, seems they bought the servo businees from Toshiba.

http://www.iis-servo.com/AboutUs/tabid/133/Default.aspx

or have a search through this lot of manuals to see if you can find yours.
http://www.iis-servo.com/TechManuals/tabid/63/Default.aspx

Hood

Title: Re: Motor/driver ID
Post by: markn on November 19, 2009, 01:14:04 PM

Hi Hood,

Thanks for the info, seems to me the fellow I bought these from mentioned Toshiba.