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  2. Variable-frequency drive - Wikipedia

    en.wikipedia.org/wiki/Variable-frequency_drive

    Small variable-frequency drive Chassis of above VFD (cover removed). A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable voltage variable frequency drive, or drive) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the ...

  3. List of Pennsylvania fire departments - Wikipedia

    en.wikipedia.org/wiki/List_of_Pennsylvania_fire...

    Economy VFD, Station 69 [176] [177] Ellwood City VFD, Station 103 [178] Enon Valley VFD, Station 12; Fallston VFD, Station 50 [179] Franklin Township VFD, Station 70 ...

  4. Volunteer fire department - Wikipedia

    en.wikipedia.org/wiki/Volunteer_fire_department

    A volunteer fire department (VFD) is a fire department of volunteers who perform fire suppression and other related emergency services for a local jurisdiction. Volunteer and retained (on-call) firefighters are expected to be on call to respond to emergency calls for long periods of time, and are summoned to the fire station when their services ...

  5. Vector control (motor) - Wikipedia

    en.wikipedia.org/wiki/Vector_control_(motor)

    In vector control, an AC induction or synchronous motor is controlled under all operating conditions like a separately excited DC motor. [21] That is, the AC motor behaves like a DC motor in which the field flux linkage and armature flux linkage created by the respective field and armature (or torque component) currents are orthogonally aligned such that, when torque is controlled, the field ...

  6. Fed's Jefferson: Rates likely to fall over medium term - AOL

    www.aol.com/feds-jefferson-rates-likely-fall...

    The Federal Reserve can continue cutting interest rates at least "over the medium term," Fed Vice Chair Philip Jefferson said on Tuesday, reiterating the U.S. central bank's message that ...

  7. Trump tariffs rattle Wall Street — here's what the movers and ...

    www.aol.com/finance/trump-tariffs-rattle-wall...

    Trump the Tariff Man has struck, unsettling a ginned-up Wall Street that had expected 2025 to be a year of strong economic growth and further big gains for hot AI trades such as Nvidia (NVDA) and ...