[Woodsmith]

I found this motor on Ebay. Just wondering about your thoughts on it.
http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT

Diameter 250mm Across Flats
Length 285mm
Voltage 24 to 72 VDC
Speed Up to 7,000rpm
Rotation Reversible
Enclosure Ventilated (IP20)
Insulation Class H
Field Connection Series with Interpoles
Termination 4xM10 Blade Terminals
Bearings Ball bearing
Shaft Extension To suit customer requirements (max diameter 45mm)
Mounting Flange or foot mounted
Weight 40kg


The N132S motor was originally developed for a fork lift truck application. The motor is series wound with a rated power of 7.6kW at 72VDC (S2 60mins rating). The version shown below has an extended shaft at the non-drive end and a plate for fitting a standard brake.

The specification look generic rather then specific to the motor for sale.

[jackbauer]

Looks sweet to me. And interpoles. Only issue will be that stupid gear output shaft.

[Woodsmith]

Originally Posted by jackbauer

Looks sweet to me. And interpoles. Only issue will be that stupid gear output shaft.

What will the interpoles do?

If it really is good for 7000rpm then I can direct drive the BMW K100 input and run safely up to 113mph.

The little gear looks like it might be splined to the shaft so it could be welded to a coupler for easy connection to the gearbox shaft.

[major]

Originally Posted by Woodsmith

I found this motor on Ebay. Just wondering about your thoughts on it.

Hi Wood,

It looks like a pretty good deal. Actually a nice machine from what I can see. And the gear looks like pinion attached to the shaft via spline or key.

It is 250mm diameter but rather short in overall length compared to a Warp9. And looking at the S2 curve, has a 125A 60 minute rating. Seemingly reasonable RPM at that load and 72V, and interpole, so higher voltage and hence RPM should get you good power. But less than what you'd have with a Warp9 or similar lifttruck motor.

Frame is unusual in that it shows no pole bolts, so may be a laminated case with wound in place field coils. Likely a short comm 4 brush deal. I don't like those terminals, but they'll do if you strain relieve the cables.

All in all, looks like a good motor for a trike or such. And with the interpoles, reverse is doable so direct drive is option. Not too heavy either. And did the seller say it was new, unused?

Cheers,

major

[major]

Originally Posted by Woodsmith

What will the interpoles do?

Interpoles aid commutation such that advance is not required for high voltage operation. Advantage is interpoles are not sensitive to rotation direction or motor/generator operation. Disadvantage; interpoles have a small power loss from winding resistance, consume internal space otherwise which could be used for torque producing components and cost money.

[Woodsmith]

Thanks for the input.

I've not spoken with the vendor yet, thought I would ask here first before the 150 mile drive to see it with a view to an offer.

Haven't figured if the diameter is the frame or the three mounting lugs but it seems to be around about the same size as my 9" but with a much higher speed and voltage. I figured that would make it worth the effort.

I may put in an offer given I could have a costly 12" to repair otherwise.

[major]

Originally Posted by Woodsmith

........about the same size as my 9" but with a much higher speed and voltage.

Looks like about 2200RPM at 125A, 72V. IIRC, not higher than most 9 inchers.

[Woodsmith]

Originally Posted by major

Looks like about 2200RPM at 125A, 72V. IIRC, not higher than most 9 inchers.

Ahhh, the ad suggests up to 7000rpm.

My 9" should be good for about 3k tops?

[major]

Originally Posted by Woodsmith

Ahhh, the ad suggests up to 7000rpm.

My 9" should be good for about 3k tops?

Yeah, for maximum speed. Even 9 inchers like the Warp9 should be able to do 5000. I'd be leery of intentionally operating that one any higher. Maybe just on the occasional downhill when nobody is looking.

[Woodsmith]

Originally Posted by major

Yeah, for maximum speed. Even 9 inchers like the Warp9 should be able to do 5000. I'd be leery of intentionally operating that one any higher. Maybe just on the occasional downhill when nobody is looking.

That would my main area for concern on maximum speed.
I could say I would only drive at 60mph but on that nice long down hill with all the trucks speeding up to 75 I don't want to be burning out my brakes holding up the traffic to save the motor. I want to be coasting down as fast as I can get away with to gain momentum for the next up hill.