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The key feature of the Ward Leonard control system is the ability to smoothly vary the speed of a DC motor, including reversing it, by controlling the field and hence the output voltage of a DC generator, as well as the field of the motor itself. As the speed of a DC motor is dictated by the supplied voltage, this gives simple speed control.
An electronic speed control follows a speed reference signal (derived from a throttle lever, joystick, or other manual input) and varies the switching rate of a network of field effect transistors (FETs). [1] By adjusting the duty cycle or switching frequency of the transistors, the speed of the motor is changed. The rapid switching of the ...
Linear (or Longitudinal) Timecode (LTC) is an encoding of SMPTE timecode data in an audio signal, as defined in SMPTE 12M specification.The audio signal is commonly recorded on a VTR track or other storage media.
MTA Staten Island Railway Automatic Speed Control: A hybrid of the PRR/LIRR systems and Rapid Transit power-frequency cab code. The ATC applies service braking in response to overspeed conditions. 75-120-180-270 are used as speed commands. Zero code is used for stop rather than restricting, which is 50PPM. 420 is used as a latch-out.
With the Ravens and Cleveland Browns playing out the clock in a lopsided Baltimore win, the Ravens had Pierce fake a rush then drop back into coverage on second-and-6.
Tommy Edman had a good first year with the Los Angeles Dodgers. The team is making sure it gets a few more. The super-utility man has agreed to a five-year, $74 million contract extension with a ...
In miniature machine construction, the cam switch probably did not appear until the early 1930s. In 1931 the American company General Electric GE released their switch SBl, a 20A auxiliary current control switch, basically a miniaturized image of the large main current control switches. The devices had simple interruption and silver crossover ...
Beck missed the second half of the game, and backup quarterback Gunner Stockton took over and led the Bulldogs to the win in overtime. That secured them a spot in the College Football Playoff and ...