Patent ID: 8353174

Claim:
A vapor compression system comprising: a compressor, a condenser, and an evaporator connected in a closed refrigerant loop; a permanent magnet synchronous motor connected to the compressor to power the compressor; and a variable speed drive connected to the motor, the variable speed drive being configured to receive an input AC power at a fixed input AC voltage and a fixed input frequency and provide an output power at a variable voltage and variable frequency to the motor, the variable voltage having a maximum voltage greater in magnitude than the fixed input AC voltage and the variable frequency having a maximum frequency greater than the fixed input frequency, the variable speed drive comprising: a converter connectable to an AC power source providing the input AC voltage, the converter being configured to convert the input AC voltage to a DC voltage; a DC link connected to the converter, the DC link being configured to filter and store the DC voltage from the converter; an inverter connected to the DC link; and a controller configured to reference a first operating map associated with the compressor, a second operating map associated with the motor, and a third operating map associated with the variable speed drive; the controller further configured to analyze the first operating map, second operating map and third operating map concurrently to select an operating point for the vapor compression system.