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General Questions
Frequently Asked Questions (FAQ)
Click the questions below to receive information on any of these questions.
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.
| ..Motor.. | Total Heat Loss (W) | Convection Heat Loss (W) | Radiation Heat Loss (W) | Convection Coefficient, h (W/m2K) |
| U11 | 2.10 | 1.74 | 0.36 | 7.08 |
| U17-1 | 3.00 | 2.44 | 0.55 | 6.47 |
| U17-2 | 3.69 | 3.01 | 0.68 | 6.47 |
| U21 | 5.58 | 4.51 | 1.08 | 6.14 |
| U22 | 7.53 | 6.08 | 1.45 | 6.14 |
| U23 | 9.13 | 7.37 | 1.76 | 6.14 |
| U31 | 10.49 | 8.36 | 2.12 | 5.78 |
| U32 | 13.48 | 10.75 | 2.73 | 5.78 |
| U33 | 17.23 | 13.74 | 3.49 | 5.78 |
| U41 | 23.22 | 18.41 | 4.81 | 5.62 |
| U42 | 29.55 | 23.43 | 6.12 | 5.62 |
| U44 | 35.88 | 28.45 | 7.43 | 5.62 |
| P61 | 50.55 | 39.65 | 10.91 | 5.34 |
| P62 | 63.42 | 49.74 | 13.68 | 5.34 |
| P63 | 76.86 | 60.28 | 16.58 | 5.34 |
For test data on the motors, see temperature curves for specific frame sizes.
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Learn About Vacuum Rated Motor Selection & Installation
Operating a motor in a vacuum is often perceived as a design challenge. Among engineers, the problems -- outgassing, contamination and temperature -- are well known. What is less well known is that there are now well-developed solutions to each of these problems.
Why Choose Empire Magnetics
Government Projects & Defense Applications
Empire Magnetics has been awarded and completed US Navy contracts in excess of $100,000 as a prime contractor. The Cage code number assigned was OYMU1, CEC code 19665900H. As a subcontractor to RSI/Comsat, SAIC, Lockheed Martin, Westinghouse, General Electric and other prime contractors for the US Government, contracts in excess of $200,000 have been awarded and completed.
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Empire Magnetics products are distributed by a nationwide and international network of motion control sales professionals. Your local distributor carries the drives and controls, and the accessories needed to build a complete motion control system.