TRUSTED BY:
Arnold A.F.B.
Argonne National Labs
Boeing
CTA Space Systems
European Space Agency
J.P.L./Hughes
U.C. Santa Cruz, Lick Observatory
Los Alamos National Labs
Optical Coating Labs
NASA/Langley AFB
Smithsonian Observatory
Space Industries
U.C. Berkeley Space Sciences Lab
Stanford Linear Accelerator
Ontario Hydro, Canada
Tokai Works, Japan
Taiwan Nuclear Power Commission
Public Nuclear Commission, Japan
Materiel
Brookhaven National Labs
General Electric Nuclear Fuels Div.
Martin Marietta/Oak Ridge National Lab
Empire Magnetics
Torque Chart for Stepper Motor U11
Specifications
Calculated torque speed curves for various voltages here |
| Series connection | Parallel connection | ||
| Speed (RPS) | Torque (oz-in) | Speed (RPS) | Torque (oz-in) |
| 1 | 3.3 | 1 | 3.4 |
| 2 | 3 | 2 | 3.2 |
| 3 | 3 | 3 | 3.1 |
| 4 | 3 | 4 | 3 |
| 5 | 2.8 | 5 | 3 |
| 6 | 2.7 | 6 | 3 |
| 7 | 2.7 | 7 | 3 |
| 8 | 2.7 | 8 | 3 |
| 9 | 2.6 | 9 | 2.8 |
| 10 | 2.3 | 10 | 2.7 |
| 11 | 2.1 | 11 | 2.6 |
| 12 | 1.9 | 12 | 2.6 |
| 13 | 1.9 | 13 | 2.6 |
| 14 | 1.7 | 14 | 2.5 |
| 15 | 1.7 | 15 | 2.4 |
| 16 | 1.7 | 16 | 2.4 |
| 17 | 1.6 | 17 | 2.4 |
| 18 | 1.6 | 18 | 2.4 |
| 19 | 1.4 | 19 | 2.2 |
| 20 | 1.3 | 20 | 2.1 |
| Series | Inductance (Mh) | DCR (Ohm) | |
| Phase A | Series Connected | 14.6 | 22.1 |
| Phase B | Series Connected | 14.6 | 22.1 |
| Holding torque single phase energized at 0.5A DC = 4 oz.in. ** °C rise – Motor center mounted to 3.5″ diameter. x 0.676″ thick alum heat sink, with thermal compound between motor and heat sink. Motor and heat sink in still air at 20° C ambient. The heat sink was sitting on a wooden bench, so that one face of 3.5″ diameter was insulated. With a single phase energized with 0.5 amps of current, for 1 hour, in still air, the motor temperature rise was 55° C. Under similar conditions, with the motor laying on its side, without benefit of the heat sink, using 0.5 amps of current into a single phase the motor temperature rise above ambient was 80° C. * | |||
| Parallel | Inductance (Mh) | DCR (Ohm) | |
| Phase A | Parallel Connected | 3.8 | 5.3 |
| Phase B | Parallel Connected | 3.8 | 5.3 |
| Holding torque single phase energized at 0.85A DC = 4 oz.in. ** °C. rise – Motor center mounted to 3.5″ diameter. x 0.676″ thick alum heat sink, with thermal compound between motor and heat sink. Motor and heat sink in still air at 20° C ambient. The heat sink was sitting on a wooden bench, so that one face of 3.5″ diameter was insulated. With a single phase energized with 0.85 amps of current, for 1 hour, in still air, the motor temperature rise was 45° C. Under similar conditions, with the motor laying on its side, without benefit of the heat sink, using 0.85 amps of current into a single phase the motor temperature rise above ambient was 72° C. * | |||
| ** If total temperature of C rise, plus ambient, is elevated beyond 125 C, it will be necessary to reduce input current. Or improve heat sinks. * In a vacuum it is assumed unit will be mounted to a heatsink that will conduct heat out of the chamber. The values shown will approximate the expected °C. rise in a vacuum when mounted to the external heatsink and the total temperature, °C rise and ambient should not exceed 125° C. |
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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