Patent ID: 11959679
Assignee: REGAL BELOIT AMERICA, INC.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  H  Y | IPC F  H

Claim 12:
13. A cooling system comprising:
a compressor motor;
a variable speed fan motor including fan stator windings; and
a variable speed fan drive circuit coupled to said variable speed fan motor, said variable speed fan drive circuit comprising:
a fan inverter configured to supply a current signal to said fan stator windings;
a sensor coupled to a power input stage of said compressor motor and configured to detect an amplitude of one of a current or a power at the power input stage;
a digital signal processor (DSP) coupled to said fan inverter and said sensor, the DSP configured to:
receive a sensor signal corresponding to the amplitude from said sensor;
select a frequency corresponding to the amplitude or at which to operate said variable speed fan motor; and
transmit control signals to said fan inverter to control said fan inverter to supply current to said fan stator windings at the selected frequency.