Cooling compressor unit model for cooling machine, has electric motor driving screw compressor, where installation variables of model are defined by outer dimension of compression screw

摘要

The model has a permanently excited electric motor driving a screw compressor, where installation variables of the model are defined by an outer dimension of a compression screw. Speed of the compression screw is variable. Vibration range of the speed of the compression screw is varied by different installation variables with respect to maximum speed. The maximum speed of smaller installation variable is higher than the maximum speed of a larger installation variable. The maximum speed of a part of the installation variable is proportional to the outer dimension of the compressor screw.