Questions on Electric Motor
Questions on Electric Motor
(OP)
I am looking for information for the following motor:
http://www.aplussurplus.com/mirror/23238a.htm
I am looking for RPM on the output on the reducer.
The HP of the motor.
The torque on the output is 900 ncm = 79.65 in.lb
This is a german motor, I also do not know what the {i} on the reducer is, Md.max is the Torque (I was thinking that maybe the i means Ratio???)
Also is there any way to tell spin direction from the tag?
Thanks
Vince
http://www.aplussurplus.com/mirror/23238a.htm
I am looking for RPM on the output on the reducer.
The HP of the motor.
The torque on the output is 900 ncm = 79.65 in.lb
This is a german motor, I also do not know what the {i} on the reducer is, Md.max is the Torque (I was thinking that maybe the i means Ratio???)
Also is there any way to tell spin direction from the tag?
Thanks
Vince





RE: Questions on Electric Motor
T=(63025 x HP / N)
RE: Questions on Electric Motor
I know that the company selling this states that this is a 1/3HP motor but I don't know if I believe it, the motor only draws 1.4 Amps, is this possible?
Thanks
RE: Questions on Electric Motor
The name-plate data say 60 W output. That's a rather far cry from 1/3 HP - which is around 250 W. Input power is around 160 W. The motor speed is 1600 RPM at rated mechanical load. You will probably have 1800 RPM (two pole motor) at very light load.
The reducer has a 10:1 ratio (your guess is correct, "i" is used for gear ratio in Germany and elsewhere). The output shaft will run 160 RPM when fully loaded.
The Max torque number (900 Ncm) is what the shaft and the gears can take mechanically. Do not expect to get that torque out of the motor. 900 Ncm and 160 RPM would mean around 150 W out from the shaft. And you can not have that. Is this where the 1/3 HP comes from? Wrong interpretation if that is the case.
The insulation class is A, and that is rather poor. Do not run the motor hot! The built-in "Wärmewächter" will help you. A "Wärmewächter" is a thermal cut-off - like a Klixon - and it will shut off the supply if the motor gets too hot.
RE: Questions on Electric Motor
RE: Questions on Electric Motor
Two more questions:
What torque would you estimate I would get out of this motor?
The Motor has 3 leads and needs a capacitor to run, how would I need to hook this up? What would I vary to make the motor run CW as opposed to CCW
Thanks in advance
RE: Questions on Electric Motor
V=115V
I=1.4A
P=60Watt ~ 1/(746(W/HP)/60W) ~ 1/12 HP
Speed=1600RPM
T=5260xHP/RPM in lb-ft
or
T=0.113x5260xHP/RPM in N-m
or
T=11.3x5260xHP/RPM in N-cm
=11.3x5260x(1/12)HP/1600RPM=3.1 N-cm
and the gear output will be
Tout=(10/1)x3.1N-cm=31 N-cm
RE: Questions on Electric Motor
Good post - but 1800rpm from a 2-pole (1 pole-pair) motor? 3600rpm from 2 poles at 60Hz, 1800rpm at 60Hz from 4 poles. This sounds like a 4-pole machine.
-----------------------------------
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RE: Questions on Electric Motor
T=(1/0.113)x5260xHP/RPM in N-m,
since 1 N-m=0.113 lb-ft
or
T=(100/0.113)x5260xHP/RPM in N-cm
=(100/0.113)x5260x(1/12)HP/1600RPM=242.44 N-cm
and the gear output will be
Tout=(10/1)x242.44N-cm=2424.4 N-cm
Apparently, the gear is supposed to be loaded 900 N-cm only.
RE: Questions on Electric Motor
so the output torque is 2424 Ncm...which converts to 214.52 lb.in. at 160 RPM...that really seems high for a 1/12 HP motor
RE: Questions on Electric Motor
1 newton meter = 0.7376 foot pound-force
so T=[5252(1/12]/1600
T=.27354 Ft.Lb = 3.276 in.lb.
Tout= (10/1)3.276 = 32.76 in.lb. = 370 ncm
does this make sense?
RE: Questions on Electric Motor
RE: Questions on Electric Motor
Correction (I beg your pardon)
T=(1.3558)x5260xHP/RPM in N-m,
since lb-ft=1.3558 N-m
or
T=(100 x 1.3558)x5260xHP/RPM in N-cm
=(100 x 1.3558)x5260x(1/12)HP/1600RPM=37.14 N-cm
and the gear output will be
Tout=(10/1)x37.14N-cm=371.4 N-cm
Apparently, the gear is supposed to be loaded 900 N-cm only since some designs of motors allow the motor to have the motor starting torque of 250% or so of the motor full load torque.