What are the different motor duties?

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Eddy Current said:
I know there is continuous duty, but what are some of the other ones and what are their definitions?
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Well, compared against the stated basis of "continuous", then there is only one other "duty", "Short Time" and then from there, one must specify the MOUNT of time, which can be whatever the manufacturer states that it is. In other words if it is not "Continuous", then it is going to be something like "5 minute", or "30 minute" rated.

From NEMA MG-1:
1.40.1 Continuous Rating
The continuous rating defines the load which can be carried for an indefinitely long period of time.
1.40.2 Short-Time Rating 
The short-time rating defines the load which can be carried for a short and definitely specified time,
less than that required to reach thermal equilibrium, when the initial temperature of the machine is within
5?C of the ambient temperature. Between periods of operation the machine is de-energized and permitted
to remain at rest for sufficient time to re-establish machine temperatures within 5?C of the ambient before
being operated again.
 
Jraef said:
Well, compared against the stated basis of "continuous", then there is only one other "duty", "Short Time" and then from there, one must specify the MOUNT of time, which can be whatever the manufacturer states that it is. In other words if it is not "Continuous", then it is going to be something like "5 minute", or "30 minute" rated.

From NEMA MG-1:
1.40.1 Continuous Rating
The continuous rating defines the load which can be carried for an indefinitely long period of time.
1.40.2 Short-Time Rating 
The short-time rating defines the load which can be carried for a short and definitely specified time,
less than that required to reach thermal equilibrium, when the initial temperature of the machine is within
5?C of the ambient temperature. Between periods of operation the machine is de-energized and permitted
to remain at rest for sufficient time to re-establish machine temperatures within 5?C of the ambient before
being operated again.
Click to expand...

OK thanks I found them all in the definitions section, I didn't know they were listed there.
 
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