The invention relates to a disc commutator and a drum commutator for an electric motor having at least two commutator plates, each having a sliding-surface segment for contacting a carbon brush, said sliding-surface segments being electrically separated from one another. In the disc commutator, the electrical separation extends between the sliding-surface segments towards a commutator diameter inclined at an angle In the drum commutator, the electrical separation of the sliding-surface segments is inclined in the longitudinal direction of the drum commutator and forms an angle with a projection of the rotational axis of the drum commutator on the casing surface of the drum commutator.

The invention relates to a disc commutator and a drum commutator for an electric motor having at least two commutator plates, each having a sliding-surface segment for contacting a carbon brush, said sliding-surface segments being electrically separated from one another. In the disc commutator, the electrical separation extends between the sliding-surface segments towards a commutator diameter inclined at an angle In the drum commutator, the electrical separation of the sliding-surface segments is inclined in the longitudinal direction of the drum commutator and forms an angle with a projection of the rotational axis of the drum commutator on the casing surface of the drum commutator.

The present invention uses a traditional electrical motor with a rotor to generate electricity or power. By manipulating the magnetic fields within a rotor, large amounts of electricity are generated by the rotation of the rotor within an external magnetic field. Oppositely charged rare-earth magnets are placed around the rotor to create a strong magnetic field that the rotor can spin or rotate within. A battery or other power source supplies power to the rotor at positive and negative terminals (brushes) that are connected to commutator. The positive and negative terminals contact the commutator close to each other, such that only a few windings or coils are charged or magnetized, and the remaining windings or coils are free to generate electricity within the external magnetic field. The few coils that are charged in combination with the external magnetic fields create sufficient rotation, while enabling the remaining free coils to generate electric power. This power or electricity that is generated is then collected at a terminal about 150-200 degrees from the positive and negative terminals from the power source. The rotor may be offset or closer to one set of magnets, which further improves power generation.

The present invention uses a traditional electrical motor with a rotor to generate electricity or power. By manipulating the magnetic fields within a rotor, large amounts of electricity are generated by the rotation of the rotor within an external magnetic field. Oppositely charged rare-earth magnets are placed around the rotor to create a strong magnetic field that the rotor can spin or rotate within. A battery or other power source supplies power to the rotor at positive and negative terminals (brushes) that are connected to commutator. The positive and negative terminals contact the commutator close to each other, such that only a few windings or coils are charged or magnetized, and the remaining windings or coils are free to generate electricity within the external magnetic field. The few coils that are charged in combination with the external magnetic fields create sufficient rotation, while enabling the remaining free coils to generate electric power. This power or electricity that is generated is then collected at a terminal about 150-200 degrees from the positive and negative terminals from the power source. The rotor may be offset or closer to one set of magnets, which further improves power generation.

Embodiments of the present disclosure relate to a rotatable RF coupling device and an electrostatic chuck incorporating the same. In some embodiments, a rotatable RF coupling device includes a conductive plate; a rotatable split cylinder configured to be coupled to a dielectric disk of an electrostatic chuck to provide RF power to one or more RF bias electrodes disposed within the dielectric disk; a plurality of RF input taps coupled to the conductive plate to couple RF power to the conductive plate; a stationary ring coupled to the conductive plate and surrounding the rotatable split cylinder; and a grounded shield surrounding the conductive plate, the stationary ring, and the rotatable split cylinder.

Embodiments of the present disclosure relate to a rotatable RF coupling device and an electrostatic chuck incorporating the same. In some embodiments, a rotatable RF coupling device includes a conductive plate; a rotatable split cylinder configured to be coupled to a dielectric disk of an electrostatic chuck to provide RF power to one or more RF bias electrodes disposed within the dielectric disk; a plurality of RF input taps coupled to the conductive plate to couple RF power to the conductive plate; a stationary ring coupled to the conductive plate and surrounding the rotatable split cylinder; and a grounded shield surrounding the conductive plate, the stationary ring, and the rotatable split cylinder.

An oil lubricated compressor having a universal motor, efficient starting and re-starting characteristics, and a long operating life. The oil lubricated compressor can have a brushed or brushless universal motor which can drive a cooling fan and a pump. The universal motor can achieve a high torque to voltage ratio, as well as a high torque to current ratio, upon starting or re-starting of the compressor. Optionally, the oil lubricated compressor can use a single cooling fan disposed in the compressor at a location which is between the universal motor and a cylinder head of the pump.

An electric brush module according to an embodiment is used in an X-ray Computed Tomography (CT) apparatus including a slip ring and a gantry fixed part and includes an electric brush holder, an electric brush, and a wear debris collecting mechanism. The electric brush holder is provided in the gantry fixed part, has an arc shape with an opening part formed therein, and has a plate-like shape. The electric brush is attached to the electric brush holder and is configured to transmit either electric power or a signal, by being in contact with the slip ring. The wear debris collecting mechanism is attached to the electric brush holder, so as to form a substantially hermetically-closed space, together with the electric brush and the electric brush holder.

An electric brush module according to an embodiment is used in an X-ray Computed Tomography (CT) apparatus including a slip ring and a gantry fixed part and includes an electric brush holder, an electric brush, and a wear debris collecting mechanism. The electric brush holder is provided in the gantry fixed part, has an arc shape with an opening part formed therein, and has a plate-like shape. The electric brush is attached to the electric brush holder and is configured to transmit either electric power or a signal, by being in contact with the slip ring. The wear debris collecting mechanism is attached to the electric brush holder, so as to form a substantially hermetically-closed space, together with the electric brush and the electric brush holder.

The invention relates to a shaft contact device 1 to make an electrical connection between a shaft and an earth point.

Device 1 has a bracket 10 for connection to a point spaced from the rotating shaft, base member 20 mounted on the bracket 10, a head member 30 having at least one electrically conductive brush 34A, 34B to engage the shaft. A pair of arms 40A, 40B each has a first end connected to spaced pivot points on the base member and a second end connected to spaced pivot points on the head member. A spring means 50 biases the head towards the shaft to engage the brush on the shaft.

In use the base member, head member and spaced arms forming a parallelogram arm whereby the head member brushes contact the shaft at a constant angle as the brushes are worn.