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A variable-frequency drive ( VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter 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 input electricity. Depending on its topology, it controls the ...
Operation. A braking chopper is an electrical 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.
Vector control, also called field-oriented control (FOC), is a variable-frequency drive (VFD) control method in which the stator currents of a three-phase AC or brushless DC electric motor are identified as two orthogonal components that can be visualized with a vector. One component defines the magnetic flux of the motor, the other the torque.
Two people are in police custody after a shooting left a rookie police officer and a bystander dead during a dance at the Gila River Indian Reservation in Arizona, early Saturday, authorities said.
The families of four Marines who died in a V-22 Osprey crash in California on June 8, 2022, have filed a lawsuit accusing the manufacturers of the twin-rotor military aircraft of negligence.. In a ...
After weeks of preparation, crews are scheduled to conduct a controlled demolition Sunday evening to break down the largest remaining span of the collapsed Francis Scott Key Bridge in Maryland ...
ABB. ABB Ltd. is a Swedish – Swiss multinational corporation headquartered in Västerås, Sweden, and Zürich, Switzerland. [5] It is traded on the SIX Swiss Exchange in Zürich, the Nasdaq Nordic exchange in Sweden and the OTC Markets Group 's pink sheets in the United States. [6] It was ranked 340th in the Fortune Global 500 list of 2020 ...
The bank accounts of tens of thousands of U.S. businesses and consumers have been frozen in the aftermath of the abrupt shutdown and bankruptcy of financial technology company Synapse, which acts ...