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searching small motor 120 VAC/VDC, 7.5 Amp
3

searching small motor 120 VAC/VDC, 7.5 Amp

searching small motor 120 VAC/VDC, 7.5 Amp

(OP)
I am looking for that electric motor for a power tool design, so must be as small as possible (around 30 mm diam.). I need manufacturer's and detailed characteristics of the motor.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

Suggestion: Visit
http://www.thomasregister.com
and type Motors: Machine Tool under Product or Service, which will return 90 companies to inquire about your specific motor needs.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

(OP)
Yes, in fact, that's a problem. It is relative easy to find a list of manufacturers for the specs I gave, but none of the motors they make are "small", for your info, the universal motor should have around 10000-36000 rpm. I have been looking in a lot of searchers with no success.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

Hi , I doubt if you will find a standard motor anywhere near that spec. You might have more luck with an air motor.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

We make motors which might suit your needs. A slotless brushless model comes to mind...similar to one already used by a major industrial tool manufacturer.

We also make others which may fall into that size category.

E-mail me if you want.


Jon

RE: searching small motor 120 VAC/VDC, 7.5 Amp

(OP)
Thanks a lot, jbartos, I already knew Groschopp but not the other two references. I have already e-mailed them as they don't have online catalogue.

Jon, your info can be as well very interesting for me. This motor is for a power tool project. The problem is that I don't know how to e-mail you directly.:(

I need drawing of the motor and speed-torque-efficiency curves.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

(OP)
Universal motors are really difficult to find because all manufacturers divide their catalogues according AC or DC motors. So, where should I look for universal motors in the catalogues?. I would appreciate as well if someone can give me some sources to get more info about universal motors.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

Merkle-Korff has a case about that size for a dc type.  Don't know how strong of a motor they can put into it.  Maybe they'll build you a prototype.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

(OP)
Thanks for the Merkle-Korff reference, their web page looks really good. However, the motors they manufacture seem to have much less power and speed than required, the other thing is that I need the motor to be universal. Notice the motor power must be 1,2 hp (900W) and speed 10,000-35.000 rpm. Dimensions are not that important, I just want it as small as possible (it is for a hand power tool, similar to a grinder), so OD can be 100mm or even higher.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

I think you can find universal motors from all power tool manufacturers!Or are you planning something different.We are planning a Brushless version for a similar application with a controller outside.Are you interested.We expect to roll out production during first week of July.The OD is expected to be 60mm.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

(OP)
Probably it is true your first statement, I can find universal motors from power tool manufacturers, but...where to obtain detailed specs in the web? (I mean drawing and speed/torque/power/current characteristics).

RE: searching small motor 120 VAC/VDC, 7.5 Amp

(OP)
I have done some more investigation about the issue with power tool makers. You can always order spare rotors and stators separatelly without the bearings and so on, so I assume this is the reason because they don't use to give the specs. I need to know then 1.How to assembly properly both parts (with acceptable excentricity!). 2. How to know the curve characteristics before trying.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

(OP)
Yes, that's it. Gselectric has interesting info about universal motors. I still don't know if they will have exactly my requirements, but at least I can read something about universal motors. Thanks jbartos. If you have some other similar web reference (your "etc") it will be of help for me.

RE: searching small motor 120 VAC/VDC, 7.5 Amp

Suggestion: Visit
http://ww.boun.edu.tr/~sco/completed_theses.htm
etc. for more advanced info from those who write books on the universal motors, e.g.
Koray Kadir ?afak
Identification of a Universal DC Motor Dynamics Using Feedforward Neural Networks
Prof. Osman Türkay

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