During the 1990s, scrap yards could choose their shredder drives. The rule of thumb was DC for large and mid-size systems (5000 hp and below) and AC wound rotor for super shredders (6000 hp and above) ...

In low-cost, high-speed motor applications, especially those inside the home, the universal motor dominates. They are as ubiquitous as the countertop blenders and the power tools they inhabit. But not ...

Variable frequency drives convert ac power to dc and then reshape that current to control ac motors. All types control speed by varying current frequency, but one subtype — flux vector drives — uses ...