TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: The rotor core has two salient poles. The stator core has two salient poles, each stator pole having a respective stator coil. There are two permanent magnets fitted to the stator core respectively located circumferentially between the stator poles and respectively facing the rotor poles across an air gap. The stator coils are wound to induce like magnetic poles in the stator poles, which in turn induce like magnetic poles in the rotor poles. The rotor (11) is biased to a rest position by a return spring. The return spring is a torsion spring in the form of a strip of spring steel attached at the end to the shaft and at another end to a stationary part of the motor. The spring has a first end fixed in a slot in an end of the shaft and has a second end located in a slot in the end cap, with the spring extending in the axial direction of the shaft. The spring is located in a slot in the shaft, extends radially of the shaft and the ends of the spring are located in recesses in the end cap. The salient poles of the rotor core and the stator core physically prevent full rotation of the rotor. The motor has a cup shaped housing closed at one end by an end cap, the housing and end cap each supporting a bearing for rotationally supporting the shaft. The bearings are bushings with a shaft interface surface of self lubricating or low friction material. One of the bearings is a special bearing that provides a spring function to urge the shaft into a predetermined orientation. The special bearing also seals the shaft to the housing to prevent ingress of moisture. The special bearing and the end cap seal the shaft to the housing. The special bearing comprises an outer ring fixed to the housing or end cap, an inner ring fixed to the shaft for rotation therewith, a web extending between the inner and outer rings and ribs extending between the inner and outer rings. The special bearing is a single casting of a resiliently deformable material. The special bearing is vulcanized to the motor shaft. Preferred Parameters: The shaft oscillates in angular range of plus minus 5 to plus minus 20, preferably plus minus 5 to plus minus 10degrees. The motor is arranged to operate on an alternating current supply frequency of 150-350 Hz.    TECHNOLOGY FOCUS - POLYMERS - Preferred Materials: The low friction material is polytetrafluoroethylene (PTFE), nickel-PTFE, nylon, or hard plastics. The material of the special bearing is rubber, synthetic rubber, rubber like materials, or silicone.