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High Temperature
Frequently Asked Questions (FAQ)
Click the questions below to receive information on any of these questions.
The answer to this question depends on the materials selected in the motor construction and the cooling capacity of the environment where the motor is used. Generally speaking, the insulation system in the motor is the limiting factor. When the temperature rating of the insulation is exceeded, the insulation melts and the wires in the winding short to undesirable locations. Typical industrial motors have class B insulations which melt at 130° C. Upgraded motors include class F (155° C), Class H (180° C) and Class 220 (220° C).
Empire Magnetics’ extended temperature HT series motors have a case temperature rating of -40° C to +155° C (this does not include ice problems). Since motors generate their own heat (and since that heat must be dissipated) the maximum recommended operating ambient temperature is 120° C.
Empire Magnetics provided a motor for a Japanese nuclear reactor where the operating temperature was 220° C. As the temperature requirement increases, however, the required materials become more exotic and the cost grows exponentially.
The basic problems with lower temperatures have to do with the following:
1) Different rates of expansion and contraction for the different materials in the motor
2) Residual stresses and weakened bonding from thermal cycling
3) Stiff lubrication
These problems can be solved. We have done so in our cryogenic motors.
Frequently Asked Questions (FAQ)
About Extended Temperature Range
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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.
Nationwide & International Distributors for Specialty Motors & Complete Motor System Solutions
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.