Counterrotating brushless DC permanent magnet motor
Abstract
A brushless DC permanent magnet motor is provided for driving an autonomous underwater vehicle. In one embodiment, the motor comprises four substantially flat stators disposed in stacked relationship, with pairs of the stators being axially spaced and each of the stators comprising a tape-wound stator coil; first and second substantially flat rotors disposed between the spaced pairs of stators. Each of the rotors includes an annular array of embedded permanent magnets. A first shaft is connected to the first rotor and a second, concentric shaft is connected to the second rotor, and the drive unit causes rotation of the two shafts in opposite directions. The second shaft comprises a hollow tube having a central bore in which the first shaft is disposed. Two different sets of bearings support the first and second shafts. In another embodiment, the motor comprises two ironless stators and pairs, and rotors mounted on opposite sides of the stators and driven by counterrotating shafts.
- Publication:
-
Patent Application Oak Ridge National Lab
- Pub Date:
- July 1990
- Bibcode:
- 1990ornl.rept.....H
- Keywords:
-
- Counter Rotation;
- Direct Current;
- Electric Motors;
- Permanent Magnets;
- Underwater Vehicles;
- Patent Applications;
- Rotors;
- Shafts (Machine Elements);
- Stators;
- Electronics and Electrical Engineering