A variable-speed drive (VSD) is used to drive a motor at variable speed. The main parts of a VSD are The control system of the VSD adjusts the output voltage and frequency so that the ratio of voltage ...

The device that controls the fan speed is called a variable speed drive. Variable frequency drives are also used on pumps and cooling towers to match the demand of the space with the proper energy ...

New data from PennDOT​ suggests technology is improving safety after rear-end crashes plagued the Schuylkill Expressway for ...