Patent ID: 7096681
Filing Date: 2006-08-29
Classification: F04C,F25B,Y02B

Abstract:
1. A method of increasing the output capacity of a screw compressor, the method comprising the steps of: providing a motor having a predetermined rated operational voltage and frequency, wherein the predetermined rated operational voltage and frequency of the motor generates a predetermined output speed of the motor; providing a variable speed drive capable of supplying a voltage and frequency to the motor greater than the predetermined rated operational voltage and frequency of the motor; connecting a screw compressor to the motor, the screw compressor having a predetermined output capacity in response to operation at the predetermined output speed of the motor; operating the variable speed drive to supply a voltage and frequency to the motor greater than the predetermined rated operational voltage and frequency of the motor, the motor generating an output speed greater than the predetermined output speed of the motor as a result of the supplied voltage and frequency to the motor being greater than the predetermined rated operational voltage and frequency of the motor; and driving the screw compressor at the generated output speed of the motor greater than the predetermined output speed of the motor to obtain an output capacity from the screw compressor greater than the predetermined output capacity of the screw compressor.