Variable Speed Drive with Secondary Winding

摘要

Embodiments of the present disclosure include a compressor configured to circulate refrigerant along a refrigerant loop, motors 106-1, 106-2, and 106-3 configured to drive the compressor, and motors 106-1, 106-2, And a variable speed drive device 104 'coupled to the motors 106-1, 106-2, and 106-3 to supply power to the motors 106-1, 106-2, and 106-3. The variable speed drive 104 'includes a primary winding 516 of a step-down transformer 514 coupled to an alternating current (AC) power supply 102; A step-down transformer (not shown) configured to supply power to the motors 106-1, 106-2, and 106-3 at variable supply voltages when the motors 106-1, 106-2, and 106-3 operate below a threshold voltage 514); And a second secondary winding 520 of a step-down transformer 514 configured to supply power at a fixed supply voltage when the motors 106-1, 106-2, and 106-3 operate above a threshold voltage.