The following table is a CALCULATED heat loss for the various motor sizes, based on the following:  Motor is in still air, ambient temperature of the air is 20° C, motor temperature is stabilized at 50° C above ambient (70° C).   Mechanical envelope of the motor is the same as the Empire Magnetics IN- series motors.

In typical applications, these figures can vary greatly, mechanical mountings provide conduction paths which are not included in these calculations while vacuum applications remove the convection pathways.  The type of drive, the winding configurations, the duty cycle, the current settings and other environmental issues affect the actual motor heating.  These numbers are only intended to provide general information, they are not specifications and there is no assurances that they are applicable to a customer controlled situation.

For  test data on the motors,  see temperature curves for specific frame sizes.