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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

    It is based on an induction generator with a multiphase wound rotor and a multiphase slip ring assembly with brushes for access to the rotor windings. It is possible to avoid the multiphase slip ring assembly, but there are problems with efficiency, cost and size. A better alternative is a brushless wound-rotor doubly fed electric machine. [12]

  5. Enigma rotor details - Wikipedia

    en.wikipedia.org/wiki/Enigma_rotor_details

    Tracing the signal on the rotors AAA is therefore only possible if a key is pressed while the rotors were in the position AAZ and the ring settings are all on 01 or A. With the rotors I, II, III (from left to right), wide B-reflector , all ring settings in B-position , and start position AAA , typing AAAAA will produce the encoded sequence EWTYX .

  6. Commutator (electric) - Wikipedia

    en.wikipedia.org/wiki/Commutator_(electric)

    A commutator consists of a set of copper segments, fixed around the part of the circumference of the rotating machine, or the rotor, and a set of spring-loaded brushes fixed to the stationary frame of the machine. Two or more fixed brushes connect to the external circuit, either a source of current for a motor or a load for a generator.

  7. 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]

  8. Field coil - Wikipedia

    en.wikipedia.org/wiki/Field_coil

    Many [note 1] rotary electrical machines require current to be conveyed to (or extracted from) a moving rotor, usually by means of sliding contacts: a commutator or slip rings. These contacts are often the most complex and least reliable part of such a machine, and may also limit the maximum current the machine can handle.

  9. Circle diagram - Wikipedia

    en.wikipedia.org/wiki/Circle_diagram

    The circle diagram can be drawn for alternators, synchronous motors, transformers, induction motors. The Heyland diagram is an approximate representation of a circle diagram applied to induction motors, which assumes that stator input voltage, rotor resistance and rotor reactance are constant and stator resistance and core loss are zero.