Electrical power generation in turbine engines in provided by a permanent magnet that emits a first magnetic field and is disposed on a first rotor assembly of a turbine engine; an armature winding connected to a second rotor assembly of the turbine engine such that the armature winding is positioned within the first magnetic field; a resonant emitter configured to receive an electrical power input from the armature winding to generate a second magnetic field of at least a predefined frequency when the first rotor assembly rotates relative to the second rotor assembly; and a resonant receiver disposed on an enclosure of the turbine engine, positioned to receive the second magnetic field and convert the second magnetic field into an electrical power output.

An electric machine for a drive system having a first DS rotor and a second DS rotor includes a first EM rotor rotatable about an axis in a first circumferential direction and including a plurality of magnets, the first EM rotor configured for mechanical coupling to the first DS rotor; and a second EM rotor rotatable about the axis in a second circumferential direction and including a plurality of windings, the second EM rotor configured for mechanical coupling to the second DS rotor and the plurality of magnets of the first EM rotor operably engaged with the plurality of windings of the second EM rotor.

A compound motor-generator system including a first motor-generator and a second motor-generator. The first motor generator includes a stator having a set of three-phase field windings and a first rotor disposed inside and coaxial with the stator and configured to rotate relative to the stator. The second motor-generator includes a rotational stator and a second rotor coupled to a common shaft with the rotor of the first motor-generator and disposed inside and coaxial to the rotational stator. The rotational stator is configured to rotate relative to the second rotor and at a higher rotational speed than the second rotor.

A compound motor-generator system including a first motor-generator and a second motor-generator. The first motor generator includes a stator having a set of three-phase field windings and a first rotor disposed inside and coaxial with the stator and configured to rotate relative to the stator. The second motor-generator includes a rotational stator and a second rotor coupled to a common shaft with the rotor of the first motor-generator and disposed inside and coaxial to the rotational stator. The rotational stator is configured to rotate relative to the second rotor and at a higher rotational speed than the second rotor.

An actuator assembly comprising an output member rotatable about a center axis relative to a structure, a first actuator having a first stator fixed to the structure and a first rotor rotatable about the center axis relative to the first stator, a second actuator having a second stator coupled to the first rotor such that the second stator rotates about the center axis relative to the first stator with rotation of the first rotor about the center axis and having a second rotor rotationally coupled to the output member, a controller configured in a failure mode to drive one of the first actuator or the second actuator to selectively control the rotation of the output member about the center axis with an operational failure of the other of the first actuator or the second actuator.

A compound motor-generator system including a first motor-generator and a second motor-generator. The first motor generator includes a stator having a set of three-phase field windings and a first rotor disposed inside and coaxial with the stator and configured to rotate relative to the stator. The second motor-generator includes a rotational stator and a second rotor coupled to a common shaft with the rotor of the first motor-generator and disposed inside and coaxial to the rotational stator. The rotational stator is configured to rotate relative to the second rotor and at a higher rotational speed than the second rotor.

A retarder-equipped rotating electrical machine includes a rotor, a stator, and a retarder rotor. The stator has teeth at regular intervals in a circumferential direction. One ends of the teeth are disposed to face the rotor. The retarder rotor has a magnetic member continuously in the circumferential direction. The retarder rotor is disposed to face the other ends of the teeth of the stator and configured to rotate integrally with the rotor. A rotor-to-stator pole piece portion having pole pieces at regular intervals in the circumferential direction is disposed between the rotor and the stator. A stator-to-retarder rotor pole piece portion having pole pieces at regular intervals in the circumferential direction is disposed between the stator and the retarder rotor. Both pole piece portions are moved in the circumferential direction to switch between an operation as a motor or generator and an operation as a retarder.

Described herein are appliances such as a vacuum cleaners having an air flow passage and a fan assembly provided in the air flow passage. The fan assembly includes (a) a first motor comprising a first rotor, a first stator, and a first rotatable output shaft drivingly connected to the first rotor; and (b) a second motor comprising a second rotor, a second stator, and a second rotatable output shaft drivingly connected to the second rotor. The first rotatable output shaft is driving connected to the second stator; and a fan blade drivingly connected to the second rotatable output shaft. Also described herein are methods of energizing a fan assembly of a portable appliance.

In the present invention, junction capacitance is increased by stabilizing the junction capacitance of rotating electrodes such that a short circuit does not occur between the electrodes. Provided is a rotating electrode unit comprising a rotor electrode unit in which one or more rotor electrodes and one or more rotor spacers are alternately stacked, and a stator electrode unit in which one or more stator electrodes and one or more stator spacers are alternately stacked, wherein the rotating electrode unit is configured such that when the rotor electrodes are power transmitting electrodes, the stator electrodes are power receiving electrodes, when the rotor electrodes are power receiving electrodes, the stator electrodes are power transmitting electrodes, the rotor electrode unit and the stator electrode unit are combined in a nesting arrangement so as to be mutually rotatable, at least the outer peripheral section of the rotor electrodes is constituted by a member comprising a magnetic body, and the stator spacers have a magnet which attracts the outer peripheral section of the rotor electrodes via magnetic force.

A retarder-equipped rotating electrical machine includes a rotor, a stator, and a retarder rotor. The stator has teeth at regular intervals in a circumferential direction. One ends of the teeth are disposed to face the rotor. The retarder rotor has a magnetic member continuously in the circumferential direction. The retarder rotor is disposed to face the other ends of the teeth of the stator and configured to rotate integrally with the rotor. A rotor-to-stator pole piece portion having pole pieces at regular intervals in the circumferential direction is disposed between the rotor and the stator. A stator-to-retarder rotor pole piece portion having pole pieces at regular intervals in the circumferential direction is disposed between the stator and the retarder rotor. Both pole piece portions are moved in the circumferential direction to switch between an operation as a motor or generator and an operation as a retarder.