Abstract: High efficiency and reduction of loss at high rotation speed can be attained with a simple configuration. The M/G includes a disc-shaped rotor 12 coupled to a main shaft 10 rotatably supported by a housing 20, 22. The rotor 12 has a permanent magnet array 14 providing a Halbach array magnetic field. Armature coils 16 are arranged in a disc-shape array to oppose to the permanent magnet array 14 and fixed to the housing 20, 22 as stators. A disc-shaped magnetic field member 24 is made of a magnetic material and arranged in a recessed part 22c formed in the housing 20, 22 at a side of the armature coils 16 opposite to the permanent magnet array 14.

Abstract: A drive device for a hybrid electric vehicle includes a power splitting gear set including a first planetary gear set having three rotatable elements of a first sun gear, a first ring gear and a first pinion carrier, and first and second motors/generators. An input shaft is connectable with the first ring gear. The output shaft is connected with the first pinion carrier. The first motor/generator is connected with the first sun gear. The second motor/generator is connectable with the output shaft and the first ring gear. The first ring gear is capable of being fixed to a stationary part.

Abstract: A drive device includes an engine, a first motor/generator, and a first planetary gear set group having at least four rotatable members and disposed between the input shaft and the output shaft. Four vertical axes corresponding to the first to fourth rotatable members are arranged in order at intervals corresponding to gear ratios of the group in a common velocity-axis diagram to correspond to a first member to a fourth member, respectively. The first member is connectable with the input shaft. The second member is connectable with the output shaft. The third member is fixable to a stationary part. The fourth member is connected with the first motor/generator. The input shaft is connectable with the engine.

Abstract: A drive device for a hybrid electric vehicle includes a power splitting gear set including a first planetary gear set having three rotatable elements of a first sun gear, a first ring gear and a first pinion carrier, a first and second motor/generator. The input shaft is connectable with the first ring gear. The output shaft is connected with the first pinion carrier. The first motor/generator is connected with the first sun gear. The second motor/generator is connectable with the output shaft and the first ring gear. The first ring gear is capable of being fixed to a stationary part.