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  2. Wound rotor motor - Wikipedia

    en.wikipedia.org/wiki/Wound_rotor_motor

    Compared to a squirrel-cage rotor, the rotor of the slip ring motor has more winding turns; the induced voltage is then higher, and the current lower, than for a squirrel-cage rotor. During the start-up a typical rotor has 3 poles connected to the slip ring. Each pole is wired in series with a variable power resistor.

  3. Slip ring - Wikipedia

    en.wikipedia.org/wiki/Slip_ring

    This can be used in starting a slip-ring induction motor, for example. A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals. It can ...

  4. Doubly fed electric machine - Wikipedia

    en.wikipedia.org/wiki/Doubly_fed_electric_machine

    However, the slip power was lost in the resistors. Thus means to increase the efficiency in variable speed operation by recovering the slip power were developed. In Krämer (or Kraemer) drives the rotor was connected to an AC and DC machine set that fed a DC machine connected to the shaft of the slip ring machine. [7] Thus the slip power was ...

  5. Rotary transformer - Wikipedia

    en.wikipedia.org/wiki/Rotary_transformer

    Prior to the development of the rotary transformer, a slip-ring pickup was used, though this was prone to developing signal noise due to corrosion of the slip rings. A rotary (rotatory) transformer is a specialized transformer used to couple electrical signals between two parts that rotate in relation to each other. [ 1 ]

  6. Synchronous motor - Wikipedia

    en.wikipedia.org/wiki/Synchronous_motor

    DC excited motors require brushes and slip rings to connect to the excitation supply. [30] The field winding can be excited by a brushless exciter. [31] Cylindrical, round rotors, (also known as non-salient pole rotor) are used for up to six poles. In some machines or when a large number of poles are needed, a salient pole rotor is used. [32] [33]

  7. Rotary converter - Wikipedia

    en.wikipedia.org/wiki/Rotary_converter

    Wiring schematic for a simplified bipolar-field Gramme-ring single-phase–to–direct-current rotary converter. (In actual use, the converter is drum-wound and uses a multipolar field.) [2] Wiring schematic for a simplified two-phase–to–direct-current rotary converter, with the second phase connected at right angles to the first [3] Wiring schematic for a simplified three-phase–to ...

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  9. Blocked rotor test - Wikipedia

    en.wikipedia.org/wiki/Blocked_rotor_test

    In the blocked rotor test, the rotor is locked securely enough that it cannot break free. [5] A low voltage is applied on the stator terminals so that there is full load current in the stator winding, and the current, voltage and power input are measured at that point. When the rotor is stationary, the slip, =. [6]