Patent ID: 6282910
Filing Date: 2001-09-04
Classification: F04D,F24F,H02P,Y02B

Abstract:
An air handler for an air conditioning system coupleable to an AC supply of a nominal frequency, comprising:a heat exchanger;a blower adapted to move air across said heat exchanger;an inverter having an inverter input and an inverter output, with said inverter input being coupleable to said AC supply and said inverter output providing a reduced frequency that is lower than said nominal frequency;an AC induction motor coupled to said blower and having a motor input, said AC induction motor having a speed that varies with a voltage frequency at said motor input; anda switch system coupled to said inverter, said motor input, and said AC supply to selectively couple said motor input to said inverter output and said AC supply, said switch system having a full blower speed mode and a reduced blower speed mode, wherein said AC supply passes through said inverter to drive said AC induction motor when said switch system is in said reduced blower speed mode and said AC supply bypasses said inverter to drive said AC induction motor when said switch system is in said full blower speed mode.