Horse power of motor

Ace · 2006-09-08T18:10:07+00:00

I finally snagged a good motor cheap and would like to know what horsepower it is.Spec's. are 1745 rpm, 115 V., 60 Hz, 1.7 A., 62 W.Any of you guys familiar with the above to help me with a conversion?Thanks in advance,Ace

Sep 08, 2006 25 Replies

Rate this thread:

Dave August 19 years ago

Since this thread is about dead I figure I can jump in here..

Obviously (maybe no so).. The 62 watts is the real "horspower" of this motor, and if I read the plate that's what I'd have figured...

Absent that as a rule of thumb If I'm checking/buying a motor with out much data or a missing plate I assume about 50% percent efficiency, (remember this is rule of thumb)... and so if I saw this motor draw the 1.7 amps (which would take full load too) and I did the math and came up with the (roughly 190 amp volts or watts, I say 95 watts of horse power)... then I'd round down to a 'nearest' fraction horsepower which would have probably been

1/8 and get pretty damn close for a guesstamate...and not too far off it real rated 62 watts.. or 1/12... In reality with out a full load I bet the current was much lower and I'd be much closer (maybe even under..) Oh and since half the time I'm doing this im my head at some scrap yard I use 750 W/Hp (like most of ya do..)

--.- Dave

Vote

Don Foreman 19 years ago

A reasonable supposition, but motors are usually rated in output power capability rather than heat dissipation capability. Rated power is usually measured at a given steady-state temperature rise above ambient, typically 40 deg C.

Vote

Martin H. Eastburn 19 years ago

I used to fly a 2 meter cell battery sail plane. Used a high power 28 amp 8V cobalt magnets motor. It was geared down to add power and drop speed - I ran 9 and 12" props the worst scare is with Nylon with sharp edges and a speed controller takes a hit from a microwave source. Off might be on!

The motors I used were made on the central coast of CA. I want to say Santa Barbara, but I think north of there...

IF needed - I can find it - don't fly any more but have the motor!

Martin

Mart> DC motors used on RC airplanes and such are often rated in watts. I

Vote

dcaster 19 years ago

Minor correction. Your motor draws 2.1 amps at 115 volts. 2.1 x 115 x whatever the power factor is = maybe 100 watts. With the output at 62 watts, it might have an efficiency of about 60%. Not great, but it is a small motor.

Dan

Vote

Eric R Snow 19 years ago

Greetings Dan, I read about the power factor correction after my post. Even though I knew about power factor and how it affected real power used I was only thinking about 3 phase motors. After I read about the major effect on single phase machines I kinda slapped myself in the head for being so blind. Thanks for pointing it out to me again. ERS

Vote

Mark Rand 19 years ago

Damn. I'm sure I pointed that out six days ago. Before your post :-)

Mark Rand RTFM

Vote

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required