Reluctance Motor Wave Winding for Compact High-Torque Compressors
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Solution Overview
Problem
Reluctance motors without permanent magnets face challenges in achieving high torque while being compact enough to fit within limited spaces in compressors, and also require increased refrigerant flow rates.
Innovation Solution
A reluctance motor design featuring a rotor with annular outer circumference and multiple magnetic poles, each with first and second slits, and a stator with wave-wound coils and refrigerant passages, allowing for increased axial lengths of the rotor and stator cores without enlarging the motor, thereby enhancing torque and refrigerant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the size of the reluctance motor is increased to generate high torque, then the torque output is improved, but the motor cannot be accommodated in the limited space inside the compressor
Solution Approach 1:
The patent applies wave winding to the stator coils, which changes the spatial arrangement and packing efficiency of the windings. This dimensional optimization allows for more effective use of the available space, enabling high torque output without proportionally increasing the motor's external dimensions, thus resolving the contradiction between torque generation and compact size for compressor integration
2Temperature
If the flow rate of refrigerant is increased to cool the motor, then the cooling effect is improved, but the motor structure becomes more complex
Solution Approach 1:
The stator core is designed with integrated refrigerant passages that serve dual purposes: providing structural support for the windings and enabling refrigerant flow for cooling. This multi-functional design allows the motor to achieve effective cooling without adding separate cooling components, thereby avoiding increased structural complexity while improving the cooling effect
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
The design achieves high torque output and sufficient refrigerant flow rates without the need for permanent magnets, enabling the motor to be compact and efficient within limited spaces, while maintaining low manufacturing costs.
Implementation Method 1
The reluctance motor does not include a permanent magnet, but includes a slit formed in a magnetic pole of a rotor, so that a driving force is obtained by means of reluctance torque
Data Source
AI summary
A reluctance motor is used in a compressor. The reluctance motor includes a rotor having a rotor core that has an annular outer circumference about an axis, having a plurality of magnetic poles along the outer circumference, and having no permanent magnet, and a stator including a stator core that surrounds the rotor from an outer side in a radial direction about the axis and a winding wound around the stator core in wave winding. Each of the plurality of magnetic poles has a first slit formed in the rotor core and a second slit formed on an inner side of the first slit in the radial direction. The stator core has a refrigerant passage through which refrigerant passes in a direction of the axis.