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The braking current decays, and after a delay of about 1.5 seconds the braking relay contactor opens again. At this point the motor can be restarted. In such a unit, there are typically two potentiometers, one to vary the braking torque from the firing circuit and the other to vary the timer. These settings are balanced so that braking torque ...
Direct torque control (DTC) is one method used in variable-frequency drives to control the torque (and thus finally the speed) of three-phase AC electric motors.This involves calculating an estimate of the motor's magnetic flux and torque based on the measured voltage and current of the 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 ...
[3] [4] The success of the Jaguar is commonly attributed to the car’s disc brakes, which allowed the drivers to approach turns faster and brake later than their opponents, which ultimately led to its victory. As late as 1963 the majority of automobiles using disc brakes were European made, with American cars adopting the technology in the ...
BMW is lowering sales and earnings targets for the 2024 fiscal year, in a move the luxury German car maker said was partially triggered by hefty expenses of addressing a braking system recall that ...
The rules also effectively ban Chinese- and Russian-made cars that incorporate the technologies in question. This ban comes after the White House quadrupled tariffs on some Chinese EVs to over 100% .
A braking chopper is an magnetical switch that limits the DC bus voltage by switching the braking energy to a resistor where the braking energy is converted to heat. Braking choppers are automatically activated when the actual DC bus voltage exceeds a specified level depending on the nominal voltage of the variable-frequency drive
Safety Percy Butler and defensive end Dorance Armstrong sandwiched Mayfield from opposite sides of the field as linebacker Bobby Wagner met him head-on.