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  2. H-bridge - Wikipedia

    en.wikipedia.org/wiki/H-bridge

    One way to build an H-bridge is to use an array of relays from a relay board. [3] A "double pole double throw" (DPDT) relay can generally achieve the same electrical functionality as an H-bridge (considering the usual function of the device). However a semiconductor-based H-bridge would be preferable to the relay where a smaller physical size ...

  3. Counter-electromotive force - Wikipedia

    en.wikipedia.org/wiki/Counter-electromotive_force

    [1] [3] The term back electromotive force is also commonly used to refer to the voltage that occurs in electric motors where there is relative motion between the armature and the magnetic field produced by the motor's field coils or permanent magnet field, thus also acting as a generator while running as a motor. This effect is not due to the ...

  4. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    SPST-NC (Single-Pole Single-Throw, Normally-Closed) relays have a single Form B or break contact. As with an SPST-NO relay, such a relay has four terminals in total. SPDT (Single-Pole Double-Throw) relays have a single set of Form C, break before make or transfer contacts. That is, a common terminal connects to either of two others, never ...

  5. Single-phase generator - Wikipedia

    en.wikipedia.org/wiki/Single-phase_generator

    Each pole has opposite polarity to its neighbors which are angled at 90 degrees. Each coils also have opposite winding to its neighbors. This configuration allows the lines of force at 4 poles to be cut by 4 coils at the same amount at a given time. At each 90-degree rotation, the voltage output polarity is switched from one direction to the other.

  6. Polarity (mutual inductance) - Wikipedia

    en.wikipedia.org/wiki/Polarity_(mutual_inductance)

    In the "subtractive" arrangement, the H1 and X1 terminals are adjacent, and the voltage measured between H2 and X2 would be the difference of the high voltage and low voltage windings. [3] Pole mounted distribution transformers are manufactured with additive polarity, while instrument transformers are made with subtractive polarity.

  7. ANSI device numbers - Wikipedia

    en.wikipedia.org/wiki/ANSI_device_numbers

    81R - common industry use for Rate Of Change Of Frequency Relay (ROCOF) 81U - Under Frequency; 82 - DC Reclosing Relay; 83 - Automatic Selective Control or Transfer Relay; 84 - Operating Mechanism; 85 - Pilot Communications, Carrier or Pilot-Wire Relay; 86 - Lock-Out Relay, Master Trip Relay; 87 - Differential Protective Relay; 87B - Bus ...

  8. Resolver (electrical) - Wikipedia

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

    On the inside, the configuration of the wire windings makes it different. The stator portion of the resolver houses three windings: an exciter winding and two two-phase windings (usually labeled "x" and "y") (case of a brushless resolver). The exciter winding is located on the top; it is a coil of a turning (rotary) transformer.

  9. SN 441011 - Wikipedia

    en.wikipedia.org/wiki/SN_441011

    The pins of the 16 A plugs are rectangle 4 (± 0.06) x 5 (± 0.06) mm wide, the corresponding openings are rectangle 4.5 (+0.2) x 5.5 (+0.2) mm wide. Distance between conductors In both the 10 A and 16 A versions, the distance between the phase conductor and the neutral conductor is 19 mm (± 0.15 mm).

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