The present invention discloses a novel electric motor, which comprises a stator and a rotor. The stator is a permanent magnet. The rotor comprises a rotor coil and a capacitor. The rotor coil and the capacitor are connected in series to form a resonant driving circuit. The resonant driving circuit is used to convert a natural electromagnetic field into a current to drive the rotor to rotate. The motor of the present invention can rotate without any external power, thereby solving the technical problem that the use of the external power makes a restriction to the further development and application of the motor, and solving the problem of motor energy consumption.

A variable-speed direct current motor comprising a stator (22), a rotor (23) arranged within the stator, and a motor drive device (40) arranged partly at the stator and partly at the rotor, wherein the stator comprises a yoke (25) defining a cylindrical cavity (31), and a plurality of permanent magnets (24) arranged at the yoke, wherein the rotor comprises a cylindrical core (26) and a conductor structure (47) arranged at the core, wherein the motor drive device comprises an alternating current transformer (41) having a primary winding (42) arranged at the stator and a secondary winding (43) arranged at the rotor, a rectifier device (44) arranged at the rotor and connected with the secondary winding, a direct current supply device (45) arranged at the rotor (23) and connected with the rectifier device (44), and with the conductor structure (47), and an operation control device (48) comprising a first unit (49) arranged at the rotor (23) and a second unit (50) arranged externally of the rotor and wirelessly communicating with the first unit.

A variable-speed direct current motor comprising a stator (22), a rotor (23) arranged within the stator, and a motor drive device (40) arranged partly at the stator and partly at the rotor, wherein the stator comprises a yoke (25) defining a cylindrical cavity (31), and a plurality of permanent magnets (24) arranged at the yoke, wherein the rotor comprises a cylindrical core (26) and a conductor structure (47) arranged at the core, wherein the motor drive device comprises an alternating current transformer (41) having a primary winding (42) arranged at the stator and a secondary winding (43) arranged at the rotor, a rectifier device (44) arranged at the rotor and connected with the secondary winding, a direct current supply device (45) arranged at the rotor (23) and connected with the rectifier device (44), and with the conductor structure (47), and an operation control device (48) comprising a first unit (49) arranged at the rotor (23) and a second unit (50) arranged externally of the rotor and wirelessly communicating with the first unit.

An electric machine includes a rotor having a magnetic field generating device for generating a magnetic flux. A flux changing apparatus of the electric machine includes an axially displaceable body that is disposed axially outside the magnetic field generating device for changing a magnetic flux within a gap between the rotor and a stator in dependence upon an axial position of the body relative to the rotor. The flux changing apparatus includes an adjusting device for axially adjusting the axial position of the body relative to the rotor. The adjusting device includes an actuator and an adjusting element. The actuator acts on the body via the adjusting element. The adjusting element engages the body and/or the actuator in such a manner that a rotational movement of the body can be decoupled from the adjusting element, a housing of the electric machine, the rotor and/or the actuator.

An electric machine includes a rotor having a magnetic field generating device for generating a magnetic flux. A flux changing apparatus of the electric machine includes an axially displaceable body that is disposed axially outside the magnetic field generating device for changing a magnetic flux within a gap between the rotor and a stator in dependence upon an axial position of the body relative to the rotor. The flux changing apparatus includes an adjusting device for axially adjusting the axial position of the body relative to the rotor. The adjusting device includes an actuator and an adjusting element. The actuator acts on the body via the adjusting element. The adjusting element engages the body and/or the actuator in such a manner that a rotational movement of the body can be decoupled from the adjusting element, a housing of the electric machine, the rotor and/or the actuator.

A variable-speed direct current motor comprising a stator (22), a rotor (23) arranged within the stator, and a motor drive device (40) arranged partly at the stator and partly at the rotor, wherein the stator comprises a yoke (25) defining a cylindrical cavity (31), and a plurality of permanent magnets (24) arranged at the yoke, wherein the rotor comprises a cylindrical core (26) and a conductor structure (47) arranged at the core, wherein the motor drive device comprises an alternating current transformer (41) having a primary winding (42) arranged at the stator and a secondary winding (43) arranged at the rotor, a rectifier device (44) arranged at the rotor and connected with the secondary winding, a direct current supply device (45) arranged at the rotor (23) and connected with the rectifier device (44), and with the conductor structure (47), and an operation control device (48) comprising a first unit (49) arranged at the rotor (23) and a second unit (50) arranged externally of the rotor and wirelessly communicating with the first unit.

A variable-speed direct current motor comprising a stator (22), a rotor (23) arranged within the stator, and a motor drive device (40) arranged partly at the stator and partly at the rotor, wherein the stator comprises a yoke (25) defining a cylindrical cavity (31), and a plurality of permanent magnets (24) arranged at the yoke, wherein the rotor comprises a cylindrical core (26) and a conductor structure (47) arranged at the core, wherein the motor drive device comprises an alternating current transformer (41) having a primary winding (42) arranged at the stator and a secondary winding (43) arranged at the rotor, a rectifier device (44) arranged at the rotor and connected with the secondary winding, a direct current supply device (45) arranged at the rotor (23) and connected with the rectifier device (44), and with the conductor structure (47), and an operation control device (48) comprising a first unit (49) arranged at the rotor (23) and a second unit (50) arranged externally of the rotor and wirelessly communicating with the first unit.

The invention relates to an electric machine comprising a permanent magnet arrangement and an electromagnetic arrangement. The electromagnetic arrangement comprises a first number of excitation coils, each excitation coils being wound around a pole core. The permanent magnet arrangement comprises a second number of magnet segments formed of a permanently magnetic material. An air gap is arranged between the electromagnet arrangement and the permanent magnet arrangement. The magnet segments have a permanent magnetisation in a first magnet segment volume. At least one magnet segment comprises a demagnetised region in a second magnet segment volume.

The invention relates to an electric machine comprising a permanent magnet arrangement and an electromagnetic arrangement. The electromagnetic arrangement comprises a first number of excitation coils, each excitation coils being wound around a pole core. The permanent magnet arrangement comprises a second number of magnet segments formed of a permanently magnetic material. An air gap is arranged between the electromagnet arrangement and the permanent magnet arrangement. The magnet segments have a permanent magnetisation in a first magnet segment volume. At least one magnet segment comprises a demagnetised region in a second magnet segment volume.

This is a novel magnetic configuration that is to be used to build extra efficient PM motors. This magnetic configuration uses mono polarities of permanent magnet as field-poles instead of dipolar field-poles configuration. Armature teeth are built, energized and used very differently in this magnetic configuration. This configuration revitalizes repulsive force three times inside a running PM motor without using more than usual current. Revitalized repulsive force allows using very strong permanent magnets, which produces heavy attractive force in the same running motor. The revitalized repulsive force along with the heavy attractive force produces extra output power in the motor at no-cost. This magnetic configuration is self-sufficient and unparalleled. It could only be implanted in new designs of PM motors. This magnetic configuration has been built around new experimental findings. The functions of three newly invented electrical machines including a fully-functional prototype validate this magnetic configuration.