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Variable speed drive (VSD) is used to control the speed and torque of (three phase) electrical induction motors (e.g asynchronous, permanent magnet and synchronous reluctance motors), which are used in compressors, con_veyors, mixers, pumps, centrifuges, fans and many other variable and con_stant torque applications in different industries. The benefits of VSD control are gained because of precise process control, which leads to significant energy savings through optimal speed control.