Physical size and weight provide the most visible evidence of the evolution of ac variable-frequency drives (VFDs) in the past 50 years. But, what's under the skin is even more dramatic for the ...

DC Motors were king in industry up until the late 1980s; These motors were popular because they were able to run to a variable speed setpoint, and they could run at full torque from stall to base ...

Applications often end up with poorly-specified drives and other motion-control components. Often that is because engineers and designers overlook characteristics such as motor type, torque, power and ...