magnetic field. The second rotation shaft rotates relative to the first rotation shaft and is supported co-axially with the first rotation shaft. The second rotor rotates with the second rotation shaft and has a second number of magnetic poles that form a second magnetic field.
The first number and the second number are different. The first rotor and the second rotor are disposed in series along the first rotation shaft. The stator comprises coils that generate a first rotating magnetic field in synchronism with the first magnetic field by application of a first alternating current, and generate a second rotating magnetic field in synchronism with the second magnetic field by application of a second alternating current. The current control device supplies a composite current comprising the first alternating currentand the second alternating current to the coils.
This invention also provides a motor/generator comprising a first rotation shaft, a second rotation shaft, a first rotor, a second rotor, a first stator, a second stator and a current control device.
The first rotor rotates with the first rotation shaft and has a first number of magnetic poles that form a first magnetic field. The second rotation shaft rotates relative to the first rotation shaft. The second rotation shaft and the first rotation shaft have different rotation axes. The second rotor rotates with the second rotation shaft and has a second number of magnetic poles that form a second magnetic field. The first number and the second number are different. The first stator comprises a third number of first coils that