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Max rated torque

Max rated torque

Max rated torque

(OP)
I am mech eng and have been asked to verify a bolt connection to a Emoteq MF0510 motor. The spec gives me both Max cont stall torque and Max rated torque. I assume I have to verify the bolt connection to max rated torque. The max rated torque has a +/- 25% variation?? on the torque. Does this mean that the max torque ever to be seen is the max rated torque +25%?

Thanks for any help.

RE: Max rated torque

The stall torque is probably higher than the max rated torque? If so, you need to use the higher number.

Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

RE: Max rated torque

I see. That motor is not like 'normal' motors where torques are presented under other conditions. The data sheet says:

Maximum Continuous Stall Torque (TC) is the amount
of torque produced at low to zero speed which results in a
110°C rise in temperature. Based upon 20°C ambient
temperatures, the resulting winding temperature is 130°C.

Maximum Rated Torque (TR) is the amount of torque
that the motor can produce without danger of demagnetizing
the rotor. This torque is only available for short durations. Also, it may not be possible to produce the Maximum Rated Torque because of limitations of voltage and
current (see Peak Torque).

So, for the bolts, I think that you chose the right max value and that the +25% shall be used also.

Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

RE: Max rated torque

In the NEMA world motors are rated at 460 Volts and system voltages are rated at 480 Volts. During a startup on a cool day with very little load on the feeders and this motor being the first on its feeder to start, +25% of peak torque is a reasonable allowance due to higher than normal voltage.  

Bill
--------------------
"Why not the best?"
Jimmy Carter

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