The Alpha series power supply module is fully AC line regenerative thus avoiding discharge resistors, their heat and mounting expense. The excess electrical energy is pumped back into the power line, saving on energy cost and cooling. Also, because the heat sink for the power electronics is mounted through the wall of the electrical enclosure, the heat generated by the amp is not added to the enclosure. providing power to Alpha spindle amplifiers ranging in size from 2.2 kW to 90 kW and servo drives. The Alpha design uses a common power supply to produce the DC power that feeds both servo and spindle amplifiers. This eliminates redundant power supply capacity.