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  2. Slip ring - Wikipedia

    en.wikipedia.org/wiki/Slip_ring

    In this example, the slip rings have a brush-lifting device and a sliding contact bar, allowing the slip-rings to be short-circuited when no longer required. 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 ...

  3. Wound rotor motor - Wikipedia

    en.wikipedia.org/wiki/Wound_rotor_motor

    A wound-rotor motor, also known as slip ring-rotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance. Adjusting the resistance allows control of the speed/torque characteristic of the motor.

  4. Doubly fed electric machine - Wikipedia

    en.wikipedia.org/wiki/Doubly_fed_electric_machine

    With its origins in wound rotor induction motors with multiphase winding sets on the rotor and stator, respectively, which were invented by Nikola Tesla in 1888, [6] the rotor winding set of the doubly fed electric machine is connected to a selection of resistors via multiphase slip rings for starting. However, the slip power was lost in the ...

  5. Induction motor - Wikipedia

    en.wikipedia.org/wiki/Induction_motor

    The speed of a pair of slip-ring motors can be controlled by a cascade connection, or concatenation. The rotor of one motor is connected to the stator of the other. [ citation needed ] If the two motors are also mechanically connected, they will run at half speed.

  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. Electric motor - Wikipedia

    en.wikipedia.org/wiki/Electric_motor

    It has zero slip under typical operating conditions. By contrast induction motors must slip to produce torque. One type of synchronous motor is like an induction motor except that the rotor is excited by a DC field. Slip rings and brushes conduct current to the rotor. The rotor poles connect to each other and move at the same speed.

  8. Rotary converter - Wikipedia

    en.wikipedia.org/wiki/Rotary_converter

    The rotary converter can be thought of as a motor–generator, where the two machines share a single rotating armature and set of field coils. The basic construction of the rotary converter consists of a DC generator (dynamo) with a set of slip rings tapped into its rotor windings at evenly spaced intervals. When a dynamo is spun the electric ...

  9. Unipolar motor - Wikipedia

    en.wikipedia.org/wiki/Unipolar_motor

    A unipolar motor (also called homopolar motor) is a direct current (DC) motor typically with slip-rings on each end of a cylindrical rotor and field magnets or a DC field winding generating a magnetic field on the stator. The rotor has typically not a winding but just straight connections in axial direction between the slip-rings (e.g. a copper ...

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