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  2. Permanent magnet motor - Wikipedia

    en.wikipedia.org/wiki/Permanent_magnet_motor

    Schematic of a permanent magnet motor using brushes and magnets in the stator. A permanent magnet motor is a type of electric motor that uses permanent magnets for the field excitation and a wound armature. The permanent magnets can either be stationary or rotating; interior or exterior to the armature for a radial flux machine or layered with ...

  3. Electromagnetic door holder - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_door_holder

    An electromagnetic door holder (electromagnetic door holder and release or hold-open device, sometimes informally called a mag hold open or electric doorstop) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until given a signal to release.

  4. Electropermanent magnet - Wikipedia

    en.wikipedia.org/wiki/Electropermanent_magnet

    An electropermanent magnet or EPM is a type of permanent magnet in which the external magnetic field can be switched on or off by a pulse of electric current in a wire winding around part of the magnet. The magnet consists of two sections, one of "hard" (high coercivity) magnetic material and one of "soft" (low coercivity) material. The ...

  5. Automatic fire suppression - Wikipedia

    en.wikipedia.org/wiki/Automatic_fire_suppression

    Engineered fire suppression systems are design specific and most commonly used for larger installations where the system is designed for a particular application. Examples include large marine and land vehicle applications, server rooms, public and private buildings, industrial paint lines, dip tanks and electrical switch rooms.

  6. Electronic warfare - Wikipedia

    en.wikipedia.org/wiki/Electronic_warfare

    Electronic warfare self-protection (EWSP) is a suite of countermeasure systems fitted primarily to aircraft for the purpose of protecting the host from weapons fire and can include, among others: directional infrared countermeasures (DIRCM, flare systems and other forms of infrared countermeasures for protection against infrared missiles; chaff ...

  7. Ranking the best college football quarterbacks in the ...

    www.aol.com/ranking-best-college-football...

    The college football transfer portal is again reshaping rosters, notably at the quarterback position. Our rankings of the signal callers on the move.

  8. Sugar Bowl: No. 2 Georgia vs. Notre Dame/Indiana winner, 8:45 p.m. (ESPN) When are College Football Playoff semifinals? The semifinal games will be played Jan. 9 and Jan. 10 at the site of two ...

  9. Prince Andrew's Business Adviser Accused of Being 'Chinese ...

    www.aol.com/lifestyle/prince-andrews-business...

    Per the BBC, in a letter found on one of the man's electronic devices, one of Andrew's advisers told the alleged spy, "Outside of [the prince's] closest internal confidants, you sit at the very ...