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High Temperature
High Temperature Motors & Resolvers
High Temperature Motors & Resolvers
High Temperature
High temperature motors, (HT- prefix) are provided with class H insulation systems. This insulation begins to melt at 180 degrees Centigrade. The heat generated by the motor must be subtracted away from the melting point of the insulation to obtain the maximum allowable ambient temperature. The ability of the motor to dissipate heat into the environment will also affect the maximum allowable ambient temperature. In typical stepper motor applications these motors will operate successfully up to +155 degrees C (refer to FAQ regarding heat losses). Provided the change in temperature does not exceed 10 degrees C. per minute, these motors can be used in a very wide range of temperatures. The HT series products without modifications are useful from 0 to about +155 (see heat loss details). For temperatures from 0 to -20 C most of the HT products can be used, but different lubrications are required. From -20 to -40 C some select products are suitable. Consult the factory before ordering. For temperatures lower than -40 C refer to Cryogenic products.
Each HT series product has a different usable temperature range.
A table of usable temp ranges for HT products.
Minimum Temp of HT Series Products
High Temperature
The chart on the right represents the lowest operating temperature for each size of HT and HM series motor.
Maximum winding temperature for all products is 155 degrees C.
Carefull monitoring and control of temperature on all products that will exceed 100 deg C is required.
Case temperature is typically 20-30 degrees lower than the winding temperature.
Operation of a motor outside of the minimum or maximum temperature range will result in damage to the motor and/or a voided warranty
| HT-U11 | -10 C |
| HT-U17-1 | 0 C |
| HT-U17-2 | 0 C |
| HT-U21 | -10 C |
| HT-U22 | 0 C |
| HT-U23 | 0 C |
| HT-U31 | -10 C |
| HT-U32 | 0 C |
| HT-U33 | 0 C |
| HT-U41 | -20 C |
| HT-U42 | -10 C |
| HT-U43 | 0 C |
| HM-U11 | -40 C |
| HM-U21 | -40 C |
| HM-U22 | -30 C |
| HM-U23 | -20 C |
| HM-U31 | -40 C |
| HM-U32 | -30 C |
| HM-U33 | -20 C |
| HM-U41 | -40 C |
| HM-U42 | -30 C |
| HM-U43 | -20 C |
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Frequently Asked Questions (FAQ)
About Extended Temperature Range
Part Number Configurator
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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.