Permanent Magnet Motor Geometry for High Power Density Compressors
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Solution Overview
Problem
The existing permanent magnet motors in compressors have limited power density and efficiency, hindering miniaturization and cost reduction in household appliances like air conditioners.
Innovation Solution
A permanent magnet motor design with specific geometric and power relationships (D1/L≥1.7 and P/(D12×L)≥8.5) for the rotor, combined with a concentrated copper winding and sintered Nd—Fe—B magnets, enhances power density and efficiency while reducing volume and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional permanent magnet motor designs are used, then the motor can operate reliably, but the power density and efficiency are limited
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between geometric parameters (D1/L≥1.7) and power parameters (P/(D1²×L)≥8.5). This quantitative optimization of the rotor's maximum distance, axial length, and rated power enables higher power density while controlling motor volume, directly resolving the contradiction between improving power and reducing size.
Solution Approach 2:
The patent transitions from conventional motor design to a flat rotor design by optimizing the D1/L ratio. This dimensional optimization allows the motor to achieve higher power density in a more compact form factor, effectively resolving the contradiction between power density improvement and volume reduction.
2Use of energy by moving object
If traditional permanent magnet motor designs are used, then the motor structure is simple, but the efficiency is limited
Solution Approach 1:
The patent optimizes operational efficiency through parameter changes by establishing specific relationships between geometric parameters (D1, L) and power parameters (P). The concentrated copper winding configuration and sintered Nd-Fe-B magnets are selected to achieve optimal electromagnetic performance, improving efficiency while maintaining structural simplicity.
Solution Approach 2:
The patent uses composite materials, specifically sintered Nd-Fe-B permanent magnets, to enhance the motor's efficiency. These high-performance magnetic materials improve the electromagnetic conversion efficiency without significantly increasing structural complexity, directly addressing the contradiction between efficiency improvement and structural simplicity.
3Power
If larger motor size is used to increase power, then the power output increases, but the space occupation and cost increase
Solution Approach 1:
The patent resolves the contradiction between power output and volume by establishing the relationship P/(D1²×L)≥8.5. This parameter optimization allows the motor to achieve higher rated power within a reduced volume, directly addressing the need to increase power while decreasing space occupation and associated costs.
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 improves power density, efficiency, and miniaturization of the permanent magnet motor, leading to enhanced performance and reduced space occupation in compressors and air conditioners.
Implementation Method 1
a permanent magnet embedded in the rotor core... the stator winding being wound on the stator tooth
Implementation Method 2
the rotor... including a rotor core and a permanent magnet embedded in the rotor core
Implementation Method 3
the stator winding is a concentrated winding, and a conductor of the stator winding is a copper wire
Implementation Method 4
the permanent magnet is made of sintered Nd—Fe—B
Data Source
AI summary
A permanent magnet motor, a compressor and an air conditioner are disclosed. The permanent magnet motor has a stator and a rotor. The stator has a stator core and a stator winding. The rotor is spaced apart from the stator in an inner-outer direction. The rotor has a rotor core and a permanent magnet embedded in the rotor core. A maximum distance between an outer peripheral contour of a cross section of the rotor and a center of the cross section of the rotor is D1, an axial length of rotor core is L, and a rated power of permanent magnet motor is P. D 1, L and P satisfy: D1/L≥1.7 and P/(D12×L)≥8.5, and the unit of P is W, and the unit of D1 and L is cm.