Double-motor driving structure of double-rotor type compressor and control method of double-motor driving structure

Abstract

The invention discloses a double-motor driving structure of a double-rotor type compressor and a control method of the double-motor driving structure. The double-motor driving structure comprises twomotors which are correspondingly connected with two compressor rotors through couplers, the two motors are connected with a power supply, and the speed ratio of the two motors is controllable. The control method is divided into three control schemes according to the speed ratio control precision requirement of the compressor rotors, and the control method comprises the two motors directly connected with one power supply, wherein one motor is connected with the power supply through a frequency converter, and the two motors are correspondingly connected with the power supply through the frequency converter; and the frequency converter is provided with a controller, and the controller is used for analyzing the difference value between the speed ratio of two rotation speed sensors and the setspeed ratio; and the set frequency of the frequency converter is adjusted, the rotating speed of the motors connected with the frequency converter is controlled, and the constant speed ratio of the two motors is kept. According to the double-motor driving structure of the double-rotor type compressor and the control method of the double-motor driving structure, the normal operation of the rotor type compressor is ensured, synchronous gears required by a traditional structure is omitted, so that the problem of oil leakage is avoided, and the double-motor driving structure is symmetrical and hasthe effects of reducing noise and the like.

Description

technical field [0001] The invention relates to compressor technology, in particular to a dual-motor drive structure of a dual-rotor compressor and a control method thereof. Background technique [0002] Twin-rotor compressors are a type of positive displacement compressors, including twin-screw, Roots and claw compressors. Double-rotor compressors are widely used in various industrial occasions due to their long mechanical life, forced suction and exhaust, no wearing parts, reliable operation, small vibration, low noise, stable operation, and no surge phenomenon. The common structural feature of this type of compressor is that there are two rotating shafts at the same time and the two rotating shafts move at a certain speed ratio. Traditional compressors of this type rely on a single motor with synchronous gears for dual-shaft drive, but because the synchronous gear structure of this type of compressor requires a large amount of lubricating oil, when the compressor is comp...

AI Technical Summary

Problems solved by technology

Traditional compressors of this type rely on a single motor with synchronous gears for dual-shaft drive, but because the synchronous gear structure of this type of compressor requires a large amount of lubricating oil, when the compressor is compressing high-clean working fluid, the lubricating oil will Enter the working chamber through the gap between the shaft and the cylinder, causing contamination that is unacceptable for the high-purity environment required by the compressor, for example, when this type of compressor is used in a hydrogen fuel cell system Pollution can cause stack poisoning, which will greatly reduce the life and performance of the stack

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