Screw Compressor Motor Embedded in Rotor
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Solution Overview
Problem
Existing screw compressors have increased axial length and operational speed issues due to the coaxial and offset positioning of electric motors, which affects their compactness and efficiency.
Innovation Solution
The motor is embedded within one of the screw rotors, eliminating the need for an overhang arrangement and allowing for a more compact design by integrating the motor stator and rotor within the rotor's cavity, with the motor rotor being part of the rotor body and axially aligned with the motor stator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric motor is positioned coaxially and offset from the male rotor, then the motor can drive the rotor effectively, but the axial length of the compressor increases
Solution Approach 1:
The motor is merged with the male rotor by embedding the motor rotor within the male rotor body, integrating two separate components into one unified structure. This eliminates the need for separate motor housing and reduces axial length while maintaining driving capability
Solution Approach 2:
The motor rotor is nested within the male rotor, with the motor rotor positioned inside a cavity formed in the male rotor body. This nested arrangement allows the motor to be housed within the rotor structure itself, significantly reducing the overall axial length of the compressor
2Device complexity
If the motor is mounted via a cantilevered arrangement, then the structure can be simplified, but the operational speed of the compressor is affected
Solution Approach 1:
The motor and male rotor are combined into a single integrated component, eliminating the need for separate mounting structures like cantilevers. This direct integration simplifies the mounting structure while improving operational speed by reducing mechanical complexity and potential vibration
3Length of moving object
If the motor is embedded within the male rotor, then the axial length is reduced, but the motor must be precisely integrated into the rotor cavity
Solution Approach 1:
The motor rotor is pre-positioned and secured within the male rotor cavity during the manufacturing process. This preliminary integration ensures precise alignment and positioning before final assembly, reducing the need for post-manufacturing adjustments and ensuring accurate motor-to-rotor alignment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This integration reduces the overall length of the compressor, enhances operational speed, and facilitates better bearing lubrication isolation from refrigerant, leading to improved compressor performance.
Implementation Method 1
the motor stator including at least one electromagnetic coil spaced about an outer periphery of the motor stator, and the motor rotor including at least one magnet spaced about an inner periphery of the motor rotor
Data Source
AI summary
A screw compressor includes a housing, a first rotor rotatable about a first axis relative to the housing, and a second rotor rotatable about a second axis relative to the housing. The second rotor is enmeshed with the first rotor. A motor is embedded within the first rotor such that the motor is coaxial with the first axis.