Motor, compressor and refrigeration device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing demand for variable-frequency motors in air conditioner compressors leads to higher consumption of heavy rare earth elements, necessitating a reduction in their use while maintaining the motor's anti-demagnetization ability.
Innovation Solution
The motor design incorporates a stator with a higher number of protruding teeth and a winding configuration that adjusts the ratio of stator teeth to winding phases, reducing the strength of the demagnetization reverse magnetic field, thereby enhancing the motor's anti-demagnetization ability without relying on heavy rare earth elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavy rare earth elements (dysprosium and terbium) are used in permanent magnets to improve anti-demagnetization ability, then the motor's resistance to demagnetization is enhanced, but the consumption of strategic resources increases and cost rises
Solution Approach 1:
The patent changes the ratio parameter of stator protruding teeth to winding phases. By increasing this ratio (more teeth per phase or fewer phases), the patent reduces the number of winding turns per tooth, which directly reduces the strength of the demagnetization reverse magnetic field generated during motor operation. This parameter change allows the use of heavy rare earth-free permanent magnets while maintaining adequate anti-demagnetization ability.
Solution Approach 2:
The patent segments the magnetic field distribution by increasing the number of stator protruding teeth relative to the number of winding phases. This segmentation creates a more distributed magnetic field pattern that reduces the concentration of reverse magnetic field strength at any single location, thereby protecting the permanent magnets from demagnetization even without heavy rare earth elements.
2Reliability
If the number of stator protruding teeth is increased while keeping winding turns per tooth unchanged, then the ratio of stator teeth to winding phases increases, but the total number of winding turns increases leading to higher copper loss
Solution Approach 1:
The patent simultaneously changes two parameters: increasing the number of stator protruding teeth while reducing the number of winding turns per tooth. The net effect is that the ratio of stator teeth to winding phases increases (improving anti-demagnetization ability), but the total number of winding turns remains controlled (limiting copper loss). This is achieved by redistributing the winding turns across more teeth rather than increasing total turns.
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 design effectively reduces the consumption of heavy rare earth elements while maintaining or improving the motor's anti-demagnetization ability, ensuring the motor's performance and cost-effectiveness.
Implementation Method 1
the strength of a demagnetization reverse magnetic field generated by energizing the winding
Data Source
AI summary
A motor, a compressor and a refrigeration device are provided. The motor has a stator and a rotor. The stator has a stator core and a winding. The stator core is provided with multiple stator protruding teeth. The winding are wound on the teeth. The rotor has a rotor core and a permanent magnet. The permanent magnet is arranged on the rotor core. A ratio of the number of the stator protruding teeth to the number of phases of the winding is adaptable to adjust the strength of a demagnetization reverse magnetic field generated by energizing the winding.