An eddy-current braking mechanism including a rotor, rotatable about a rotor axis; at least one electrically conductive member coupled to the rotor for rotation therewith; at least one magnet configured to apply a magnetic field extending at least partially orthogonal to the plane of rotation of the conductive member, and characterised in that upon rotation of the rotor, the conductive member is configured to move at least partially radially from the rotor axis into the applied magnetic field.

An axial flux electric machine has a rotatable shaft, a fixed stator core comprising a ferromagnetic material and defining an axis of rotation, and a rotor assembly comprising a plurality of permanent magnets. The rotor assembly is rotatable about the axis of rotation. An axial air gap is defined between the stator core and the rotor assembly. The rotor assembly is axially displaceable towards and away from the stator core. The rotor assembly has a first position wherein the axial gap is a predetermined width greater than zero, and a second position wherein the axial gap is zero, such that the rotor assembly and the stator core contact each other.

The invention relates to a guiding element for use in an electric motor, an electric motor, and a method of installing a rotatable element in an electric motor. The guiding element comprises a guide for a rotatable element of the electric motor. The guide is adapted to radially guide the rotatable element relative to a rotary axis. The guiding element also comprises a centering device adapted to align and/or fix a sensor holding device in the electric motor relative to the guiding element. Moreover, the guiding element comprises a fixing device adapted to fix the guiding element to a housing of the electric motor.

The invention relates to a guiding element for use in an electric motor, an electric motor, and a method of installing a rotatable element in an electric motor. The guiding element comprises a guide for a rotatable element of the electric motor. The guide is adapted to radially guide the rotatable element relative to a rotary axis. The guiding element also comprises a centering device adapted to align and/or fix a sensor holding device in the electric motor relative to the guiding element. Moreover, the guiding element comprises a fixing device adapted to fix the guiding element to a housing of the electric motor.

An electric generator equipped in a multi-shaft gas turbine engine for aircraft, includes: a rotor attached to the rear end portion of a low-pressure shaft rotatably supported by a bearing in the gas turbine engine; a stator provided around the rotor; wherein the electric generator has no structure to support the low-pressure shaft and the rotor.

An electric generator equipped in a multi-shaft gas turbine engine for aircraft, includes: a rotor attached to the rear end portion of a low-pressure shaft rotatably supported by a bearing in the gas turbine engine; a stator provided around the rotor; wherein the electric generator has no structure to support the low-pressure shaft and the rotor.

A rotating electric machine includes a rotor rotatably supported and also including a magnet portion; a stator including a stator winding; and a plunger configured to displace the rotor and the stator relative to one another along an axial direction of the rotating electric machine. The stator includes a slotless structure in which at least one of no magnetic teeth and slot is provided. Thus, an attracting force acting between the magnet portion and the stator is weakened, thereby the rotor and the stator are easily displaceable relative to each other by the plunger.

A rotating electric machine includes a rotor rotatably supported and also including a magnet portion; a stator including a stator winding; and a plunger configured to displace the rotor and the stator relative to one another along an axial direction of the rotating electric machine. The stator includes a slotless structure in which at least one of no magnetic teeth and slot is provided. Thus, an attracting force acting between the magnet portion and the stator is weakened, thereby the rotor and the stator are easily displaceable relative to each other by the plunger.

An electric motor includes a stator and a rotor rotatably mounted to the stator. The rotor includes a rotary shaft, a rotor main body attached around the rotary shaft, the rotor main body being rotatable under the interaction between the rotor main body and the stator when the winding is energized. The rotor main body and the rotary shaft are in a loose fitting with each other to allow a rotation speed difference being existed between the rotor main body and the rotary shaft during startup of the rotor. A time-delayed synchronization mechanism is connected between the rotary shaft and the rotor main body and configured to eliminate, with time delay, the rotation speed difference between the rotor main body and the rotary shaft.

Motor dampening provisions are described. Incorporation and use of the motor dampener(s) in a rotary type drain cleaning machine enables elimination of a clutch in the machine. Also described are clutch-free drive systems using the motor dampener(s). Also described are torque countering members that are used in conjunction with the motor dampener(s).