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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. 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 ...

4. Motor drive - Wikipedia

   en.wikipedia.org/wiki/Motor_drive

   A variable frequency drive (VFD) or variable speed drive (VSD) describes the electronic portion of the system that controls the speed of the motor. More generally, the term drive, describes equipment used to control the speed of machinery. Many industrial processes such as assembly lines must operate at different speeds for different products.

5. Variable speed fire pump controller - Wikipedia

   en.wikipedia.org/wiki/Variable_speed_fire_pump...

   For the same application, the program would select a 125 kW gen-set when using a variable frequency drive and a primary reactor bypass with a 30% starting voltage drop, cutting the gen-set in half (Slides 36–39). [5] Energy Savings – "Most motors turn at nearly constant speed. However, much of the time the devices they drive operate at less ...

6. 3 firefighters, 12 passengers hurt after Brightline train ...

   www.aol.com/brightline-train-collides-fire-truck...

   Three firefighters and 12 train passengers were hospitalized after a Brightline train crashed with a fire truck in crowded downtown Delray Beach late Saturday morning. The crash took place about ...

7. Emerson station (NJ Transit) - Wikipedia

   en.wikipedia.org/wiki/Emerson_station_(NJ_Transit)

   Emerson is an active commuter railroad station in the borough of Emerson, Bergen County, New Jersey.The station, serviced by trains of the Pascack Valley Line from Spring Valley in Rockland County, New York to Hoboken Terminal in Hudson County, New Jersey, is located at the intersection of Kinderkamack Road (County Route 503) and Linwood Avenue in Emerson.