A hybrid cementing apparatus includes a mixing tub; a genset; variable frequency drives electrically coupled to the genset; a transfer switch electrically coupled to the variable frequency drives; electric motors electrically coupled to the variable freque...

A linear motor for a compressor having asymmetric load characteristics in both directions of a stroke, improves the service life of a bearing, and reduces a total length of a system. The linear motor includes a movable element having a magnetic pole frame ...

A fault tolerant electric drive system comprises an alternator (10), a motor controller (12) and an electric motor (14), wherein the alternator (10) and motor (14) each have a plurality of corresponding independent phase windings, the motor controller (12)...