초록 ▼

Two rotors (3,4) and one stator (2) are arranged coaxially. The stator (2) comprises a coil unit (6) which produces, by the supply of a first alternating current, the same number of rotating magnetic fields as the number of magnetic poles of said first rotor (3), and, by the supply of a second alter

Two rotors (3,4) and one stator (2) are arranged coaxially. The stator (2) comprises a coil unit (6) which produces, by the supply of a first alternating current, the same number of rotating magnetic fields as the number of magnetic poles of said first rotor (3), and, by the supply of a second alternating current, the same number of rotating magnetic fields as the number of magnetic poles of said second rotor (4). A composite current of said first and second alternating currents is supplied to said coil unit (6), and a circuit (15) is provided for compensating torque fluctuation due to non-uniformity of the magnetic field accompanying the relative rotation of the two said rotors (3, 4).

대표청구항 ▼

[What is claimed is:] [1.]a first rotor comprising plural magnetic poles and supported free to rotate,a second rotor comprising plural magnetic poles and supported free to rotate coaxially with said first rotor,a stator fixed co-axially with said first rotor,a coil unit comprising plural coils dispo

[What is claimed is:] [1.]a first rotor comprising plural magnetic poles and supported free to rotate,a second rotor comprising plural magnetic poles and supported free to rotate coaxially with said first rotor,a stator fixed co-axially with said first rotor,a coil unit comprising plural coils disposed at equal angular intervals on said stator, wherein said coil unit forms plural rotating magnetic fields of equal number to the number of magnetic poles of said first rotor according to a first alternating current and forms plural rotating magnetic fields of equal number to the number of magnetic poles of said second rotor according to a second alternating current,an electrical circuit for supplying a composite electrical current comprising said first alternating current and said second alternating current to said coil unit, anda circuit for compensating a torque fluctuation produced in either of said two rotors due to the non-uniformity of the magnetic field accompanying the relative rotation of said first rotor and second rotor.