Design and Performance of an Axial Air-Gap Solution Pump Motor
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
An axial air gap, permanent magnet, brushless dc motor has been designed and has been evaluated on a dynamometer to measure operating characteristics. The motor must deliver 0.167 hp (~120 W) to the pump rotor at 1800 rpm. Initial performance data with a half-bridge, Hall-probe synchronized drive system and a dry motor bearing did not achieve the desired motor performance. Subsequently, a commercial full-bridge, speed-regulated sensorless'' drive system was used to test the motor. The motor delivered the required 90 oz-in. of torque at 1800 rpm. These data revealed the need for rewinding the stator core to improve motor efficiency. A second stator core, with deeper slots and additional turns of wire, was subsequently fabricated and tested. At 1800 rpm, the drive system could produce only 60 oz-in. of torque due to an unexpectedly high generated voltage. Motor efficiency was 60 to 70% at this torque level when the data were corrected for bearing and coupling drag.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5969863
- Report Number(s):
- ORNL/ATD--36; ON: DE91009988
- Country of Publication:
- United States
- Language:
- English
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