A ground contact and a method for conducting electric currents from a rotor part of a machine to a stationary stator part of the machine, the rotor part having an axis or shaft, the ground contact comprising a holder device connected to the stationary stator part of the machine in an electrically conductive manner and a contact realized as a flexible conductor having a free end disposed on a circumference of the rotor part and an end fastened on the holder device, the conductor being inherently stable such that a contact force can be applied to a contact surface for establishing an electrically conductive sliding contact between a sliding contact surface of the conductor and the circumference of the rotor part. The conductor is bendable such that the free end extends in the direction of a rotational axis of the rotor part when disposing the ground contact on the rotor part.

The present disclosure relates to a motor with bidirectional terminals. According to the present disclosure, as the brush terminals are installed on both the left and right sides of the upper surface of the brush card assembly, it is possible to prevent the assembly defects of the motor due to the erroneous assembly of the brush terminals.

The present disclosure relates to a motor with bidirectional terminals. According to the present disclosure, as the brush terminals are installed on both the left and right sides of the upper surface of the brush card assembly, it is possible to prevent the assembly defects of the motor due to the erroneous assembly of the brush terminals.

A rotary electronic component capable of reducing an abrasion and a metal fatigue of a slider and extending a rotation life time compared to the conventional technology. A rotary electronic component is provided with a buffer member between a sliding portion of a slider and a rotor. Thus, the sliding portion is energized toward the annular electrode with a proper elastic force and the sliding portion is held. Because of this, vibration of the sliding portion is suppressed and metal fatigue of the slider can be reduced. Furthermore, since the lubricant is impregnated into the buffer member and a part of the buffer member is in contact with the annular electrode, the lubricant can be applied on the annular electrode. Consequently, the sliding portion slides smoothly and the abrasion of the contact portion can be further reduced. In addition, since the buffer member functions to wipe the surface of the annular electrode, foreign substances such as dust on the annular electrode are collected. Thus, harmful effect to the contact portion by the foreign substances can be prevented. By the above described configurations, the rotary electronic component of the present invention can obtain the extended life time and high operation reliability.

A rotary electronic component capable of reducing an abrasion and a metal fatigue of a slider and extending a rotation life time compared to the conventional technology. A rotary electronic component is provided with a buffer member between a sliding portion of a slider and a rotor. Thus, the sliding portion is energized toward the annular electrode with a proper elastic force and the sliding portion is held. Because of this, vibration of the sliding portion is suppressed and metal fatigue of the slider can be reduced. Furthermore, since the lubricant is impregnated into the buffer member and a part of the buffer member is in contact with the annular electrode, the lubricant can be applied on the annular electrode. Consequently, the sliding portion slides smoothly and the abrasion of the contact portion can be further reduced. In addition, since the buffer member functions to wipe the surface of the annular electrode, foreign substances such as dust on the annular electrode are collected. Thus, harmful effect to the contact portion by the foreign substances can be prevented. By the above described configurations, the rotary electronic component of the present invention can obtain the extended life time and high operation reliability.

The present invention provides a motor generator, and the motor generator comprises a permeability structure, a bearing, a hollow rotating shaft, a ringed clip and a rotatable guiding structure. The permeability structure comprises a primary permeability unit and a secondary permeability unit wherein the second permeability unit is stacked with the first permeability unit along an axial air-gap to form a symmetrical structure having a hollow shaft. The bearing is disposed inside the hollow shaft of the permeability structure. The hollow rotating shaft is passed through the hollow shaft of the permeability structure and disposed at another side of the bearing with respect to the permeability structure. The ringed clip is used for fixing the bearing and the hollow rotating shaft. The rotatable guiding structure is disposed inside the hollow rotating shaft for providing power source and transmitting signals.

The present invention provides a motor generator, and the motor generator comprises a permeability structure, a bearing, a hollow rotating shaft, a ringed clip and a rotatable guiding structure. The permeability structure comprises a primary permeability unit and a secondary permeability unit wherein the second permeability unit is stacked with the first permeability unit along an axial air-gap to form a symmetrical structure having a hollow shaft. The bearing is disposed inside the hollow shaft of the permeability structure. The hollow rotating shaft is passed through the hollow shaft of the permeability structure and disposed at another side of the bearing with respect to the permeability structure. The ringed clip is used for fixing the bearing and the hollow rotating shaft. The rotatable guiding structure is disposed inside the hollow rotating shaft for providing power source and transmitting signals.

An electrical contact device includes a high electric potential-side contact and a low electric potential-side contact having a lower electric potential than the high electric potential-side contact. The high electric potential-side contact and the low electric potential-side contact are configured to be brought into and out of contact with each other. At least one of the high electric potential-side contact and the low electric potential-side contact is formed of a low-boiling point material whose boiling point is lower than 2562° C. or a mixed material that contains the low-boiling point material.

An electrical contact device includes a high electric potential-side contact and a low electric potential-side contact having a lower electric potential than the high electric potential-side contact. The high electric potential-side contact and the low electric potential-side contact are configured to be brought into and out of contact with each other. At least one of the high electric potential-side contact and the low electric potential-side contact is formed of a low-boiling point material whose boiling point is lower than 2562° C. or a mixed material that contains the low-boiling point material.

A rotary connector includes a rod-shaped rotating side electrode rotatably supported by an external shell case and a fixed side electrode supported by the external shell case. Rotating side electrode and the fixed side electrode are disposed so that one end parts of the electrodes face each other spaced apart to form a clearance therebetween, the rotary connector further has a cylindrical liquid impregnated member, disposed so as to surround the outer peripheral surface close to the one end part of the fixed side electrode, that covers the clearance formed between the fixed side electrode and the rotating side electrode from outer peripheral sides of the fixed side electrode and the rotating side electrode, and the region formed by one end part of the rotating side electrode, one end part of the fixed side electrode, and the inner peripheral surface of the liquid impregnated member is filled with liquid metal.