Permanent magnet motor, compressor and refrigeration system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compressors with permanent magnet motors experience reduced energy efficiency due to unsuitable parameter ranges in triangular winding structures, leading to poor manufacturability and performance.
Innovation Solution
A permanent magnet motor with specific parameter ranges for the stator and rotor, including diameter, air-gap flux density, axial length, and number of turns, optimized to improve energy efficiency and manufacturability, featuring a triangular winding structure and coordinated current phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional star connection windings are used in permanent magnet motors for compressors, then the motor can operate with conventional parameter ranges, but the energy efficiency is reduced when thick conductors are required for high-power or low-voltage applications
Solution Approach 1:
The patent changes the winding connection parameter from traditional star connection to triangular (delta) connection, and optimizes the parameter relationship 0.003≤(D+d)×L×Bm1×Ns/Udc≤0.008. This parameter transformation allows the motor to achieve high energy efficiency while using thinner conductors, thereby improving both energy efficiency and manufacturability for high-power applications.
2Power
If thick conductors are used in star connection windings for high-power applications, then the motor can handle high power requirements, but the manufacturability deteriorates and performance is degraded
Solution Approach 1:
By transforming to triangular connection and optimizing the parameter relationship, the patent enables high power handling capability with thinner, more manufacturable conductors. The triangular connection provides higher current carrying capacity and reduced voltage drop, allowing thick conductors to be replaced with thinner, easier-to-manufacture alternatives while maintaining or improving power output.
3Device complexity
If conventional parameter ranges are applied to triangular winding structure, then the motor structure is simplified, but the energy efficiency is reduced
Solution Approach 1:
The patent maintains the simplified triangular winding structure but introduces optimized parameter ranges, specifically 0.003≤(D+d)×L×Bm1×Ns/Udc≤0.008. This parameter optimization ensures high energy efficiency while preserving the manufacturing simplicity and structural advantages of the triangular connection, resolving the contradiction between simplicity and efficiency.
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 optimized parameter ranges significantly enhance energy efficiency and motor performance, particularly in compressors with triangular winding structures, improving manufacturability and overall compressor efficiency.
Implementation Method 1
the fundamental wave amplitude Bm1 (T) of an air-gap flux density at an average gap between the stator and the rotor
Implementation Method 2
a permanent magnet provided on the rotor core
Data Source
AI summary
Disclosed are a permanent magnet motor, a compressor and a refrigeration system. In the permanent magnet motor, the diameter D of a contour circle of the smallest inner periphery of a stator, the diameter d of a contour circle of the largest outer periphery of a rotor, the fundamental wave amplitude Bm1 of an air-gap flux density at an average gap between the stator and the rotor, the axial length L of the rotor, the total number of serially connected turns Ns of each phase winding, and a bus DC voltage Udc of a frequency converter supplying power to the permanent magnet motor before inversion are set as: 0.003 Udc≤(D+d)×L×Bm1×Ns≤0.008 Udc.