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  2. Superconducting electric machine - Wikipedia

    en.wikipedia.org/wiki/Superconducting_electric...

    A superconducting rotor does not have the inherent damping of a conventional rotor. Its speed may hunt or oscillate around its synchronous speed. Motor bearings need to be able to withstand cold or need to be insulated from the cold rotor. As a synchronous motor, electronic control is essential for practical operation.

  3. Bearing (mechanical) - Wikipedia

    en.wikipedia.org/wiki/Bearing_(mechanical)

    A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.

  4. Foil bearing - Wikipedia

    en.wikipedia.org/wiki/Foil_bearing

    Turbomachinery is the most common application because foil bearings operate at high speed. [6] Commercial applications in production include microturbines, [7] fuel cell blowers, [8] and air cycle machines. The main advantage of foil bearings is the elimination of the oil systems required by traditional bearing designs. Other advantages are:

  5. Fluid bearing - Wikipedia

    en.wikipedia.org/wiki/Fluid_bearing

    Fluid bearings are frequently used in high load, high speed or high precision applications where ordinary ball bearings would have shortened life or caused high noise and vibration. They are also used increasingly to reduce cost. For example, hard disk drive motor

  6. Universal motor - Wikipedia

    en.wikipedia.org/wiki/Universal_motor

    As the motor rotation builds up, the resistance is gradually cut out. The speed-torque characteristic is an almost perfectly straight line between the stall torque and the no-load speed. This suits large inertial loads as the speed will drop until the motor slowly starts to rotate and these motors have a very high stalling torque. [6]

  7. Ball bearing motor - Wikipedia

    en.wikipedia.org/wiki/Ball_bearing_motor

    A ball bearing motor is an unusual electric motor that consists of two ball-bearing-type bearings, with the inner races mounted on a common conductive shaft, and the outer races connected to a high current, low voltage power supply. An alternative construction fits the outer races inside a metal tube, while the inner races are mounted on a ...

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