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  2. Armature (electrical) - Wikipedia

    en.wikipedia.org/wiki/Armature_(electrical)

    In the armature, an electromotive force is created by the relative motion of the armature and the field. When the machine or motor is used as a motor, this EMF opposes the armature current, and the armature converts electrical power to mechanical power in the form of torque, and transfers it via the shaft. When the machine is used as a ...

  3. Protective relay - Wikipedia

    en.wikipedia.org/wiki/Protective_relay

    Electromechanical protective relays at a hydroelectric generating plant. The relays are in round glass cases. The rectangular devices are test connection blocks, used for testing and isolation of instrument transformer circuits. In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker when a fault is ...

  4. Shading coil - Wikipedia

    en.wikipedia.org/wiki/Shading_coil

    AC relay with shading coil (red arrow near top) for operating with AC. A shading coil or shading ring (Also called Frager spire or Frager coil) is one or more turns of electrical conductor (usually copper or aluminum) located in the face of the magnet assembly or armature of an alternating current solenoid. The alternating current in the ...

  5. A Symbolic Analysis of Relay and Switching Circuits

    en.wikipedia.org/wiki/A_Symbolic_Analysis_of...

    The utilization of the binary properties of electrical switches to perform logic functions is the basic concept that underlies all electronic digital computer designs. Shannon's thesis became the foundation of practical digital circuit design when it became widely known among the electrical engineering community during and after World War II.

  6. Reed relay - Wikipedia

    en.wikipedia.org/wiki/Reed_relay

    A few million reed relays were used from the 1930s to the 1960s for memory functions in Bell System electromechanical telephone exchanges. [2] Often a multiple-reed relay was used, with one of the reeds latching the relay, and the other or others performing logic or memory functions.

  7. Stepping switch - Wikipedia

    en.wikipedia.org/wiki/Stepping_switch

    In electrical engineering, a stepping switch or stepping relay, also known as a uniselector, is an electromechanical device that switches an input signal path to one of several possible output paths, directed by a train of electrical pulses. The major use of stepping switches was in early automatic telephone exchanges to route telephone calls ...

  8. Safety relay - Wikipedia

    en.wikipedia.org/wiki/Safety_relay

    As such, safety relays monitor a specific function. When connected to other safety relays, they guarantee full monitoring of a plant or machine. [1] They meet the requirements of EN 60947-5-1, EN 60204-1 and VDE 0113-1. [5] Furthermore, there are many variants of safety relays, which are suitable for various machinery applications.

  9. Rotating magnetic field - Wikipedia

    en.wikipedia.org/wiki/Rotating_magnetic_field

    The rotating magnetic field is the key principle in the operation of induction machines.The induction motor consists of a stator and rotor.In the stator a group of fixed windings are so arranged that a two phase current, for example, produces a magnetic field which rotates at an angular velocity determined by the frequency of the alternating current.