Electric motor with small cross section

Vladimir Vassilevsky · 2012-07-22T15:33:10+00:00

Hello All,Could you suggest a rotary electric motor, rated at 5...10kW, with smaller cross section area, say, 5-6 square inches or possibly less? Length is not critical. Could be of any type (brush, BLDC, reluctance, AC...), with windings rated at few hundred volts. Precise controllability is not required; price is not very critical. I am having difficulty in finding any motor in kW power range that would fit small cross section requirement.Vladimir VassilevskyDSP and Mixed Signal Consultant

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P E Schoen 13 years ago

reluctance,

controllability

Someone already suggested model airplane motors such as those by Turnigy = on=20 the

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website. Otherwise 400Hz motors as used on = aircraft=20 may be small enough at that power level, although most of them are not = long=20 and slim. If you can accept about 5 inches square, here is a 7.5 HP = motor=20 that is 5.5" square and 8" long, and 14 lb. 12,000 RPM.

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Here is a 1.75 HP 3phase 400Hz motor that is size 30, whatever that is. = But=20 they seem pretty small and I think they do custom:

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r/30-20-156? And 1.85 HP 22,000 RPM size 33.

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r/33-20-150?

This is almost 2HP but I see that size 33 is 3.28" dia:

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1.35HP is 2.6" diameter and 3.87" long. That's about 1 kW. Maybe five=20 mounted lengthwise on a common shaft?

This will probably be a custom...

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Paul=20

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P E Schoen 13 years ago

Here you go.

1300 watts continuous. 1.42" dia, 3.46" long, but only 22V.

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2360 watts peak, 2" diameter, 2.6" long, 22VDC

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5500 watts, 55.8mm diameter, 35V to 70V

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9a8c

Paul=20

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langwadt 13 years ago

and if power is needed (assuming the 8mm axel can handle it) it should posible to stack them on a common shaft. I believe the shaft is just a plain 8mm with a groove for a retainer ring and maybe a flat spot for a pinol screw

-Lasse

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Tom Del Rosso 13 years ago

I thought there might be a neater way.

That's the common 'tape recorder' method. I would expect an ME to think of that and rule it out for gnashing the gears or just for being too 'tape recorder'.

Reply in group, but if emailing add one more zero, and remove the last word.

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Bob Engelhardt 13 years ago

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28000 rpm! It's funny that the OP did not specify rpm, it seems to me that it would be a fundamental criterion. Voltage, current, cost could be dealt with, rpm not so much. Wonder if he is trolling.

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John Larkin 13 years ago

The input shaft drove a 1:1 engaged gear pair, which gave me two parallel, counter-rotating shafts. They were coupled through one-way couplings (the shaft couplings with rollers inside) to two gears coupled with toothed belts, one of them driving the counter. The one-way couplers are very precise, practically ideal diodes, and only contribute error on reversal. Reversal in a steamship is infrequent, so the longterm loss was minute, probably not one shaft revolution per year. Try to design an electrical FWB rectifier that's accurate to better than 0.1 PPM!

Back-driving this rig is interesting. It behaves a lot like an electrical full-wave bridge rectifier.

John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

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Spehro Pefhany 13 years ago

A bridge made with 1N4148 diodes would have leakage of a few nA maybe and could conduct a few hundred mA, so from a current basis, that's more like 0.01ppm. Electrical wins again.

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John Larkin 13 years ago

Forward drop is the analogous error, not reverse leakage. I think.

John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation

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Jon Elson 13 years ago

Practically every VCR has such a mechanism to provide take up tension on the appropriate reel.

Jon

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Fred Abse 13 years ago

Ever come across integrating wheels? Used in mechanical flowmeters, back in the day for integrating quantity.

"For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." (Richard Feynman)

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John Larkin 13 years ago

I had a 6-hour layover in Honolulu so I took a taxi to Pearl Harbor - well worth the trip, a very moving experience - and toured a WWII submarine. It has a gorgeous torpedo targeting computer, full of gears and mechanical integrators and stuff. It's got a glass cover, looks sort of like a pinball machine.

John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation

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Tom Del Rosso 13 years ago

One sub captain said it was the most reliable thing on his boat.

Reply in group, but if emailing add one more zero, and remove the last word.

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Michael A. Terrell 13 years ago

I've talked to the crew of the Nautilus who told of the equipment problems they had going under the North Pole. I also talked with the man who designed the controls for the reactor of that first nuclear powered submarine. There are a lot of old submariners living around here.

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Electric motor with small cross section

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