Motor, compressor, and air conditioner
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Solution Overview
Problem
Motors used in compressors face challenges in suppressing vibration and noise while maintaining a sufficient refrigerant flow rate, as existing winding methods either obstruct refrigerant flow or fail to effectively reduce harmonic components of induced voltage.
Innovation Solution
A motor design featuring a stator with a wave winding configuration and a specific ratio of teeth to poles (S/P ≥ 6) that reduces harmonic components of induced voltage, allowing for improved refrigerant flow through strategically placed passages within the stator core, thereby minimizing vibration and noise while enhancing refrigerant flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If concentrated winding is used, then the motor structure is simpler, but noise and vibration are not sufficiently suppressed
Solution Approach 1:
The stator core is divided into multiple teeth (S) with specific arrangement, and the winding is segmented into multiple phases and coils distributed across these teeth. The segmentation of the magnetic circuit into discrete teeth and the distributed placement of windings help reduce harmonic components and suppress noise and vibration while maintaining structural feasibility
Solution Approach 2:
The patent specifies a particular parameter range for the ratio of teeth to poles (S/P ≥ 6) to optimize the motor's electromagnetic characteristics. This parameter change ensures sufficient suppression of harmonic components and noise/vibration while accommodating the refrigerant passage design, resolving the contradiction between simplicity and performance
2Object-affected harmful factors
If distributed winding is used, then noise and vibration are suppressed, but the winding protrudes outward and obstructs refrigerant flow
Solution Approach 1:
The refrigerant passage is designed to extend in the axial direction (another dimension) rather than only in the radial direction. This allows the refrigerant flow path to bypass the outward-protruding winding in the radial dimension, eliminating the obstruction problem while maintaining the noise-suppressing distributed winding structure
Solution Approach 2:
The stator core structure serves multiple functions: it provides the magnetic circuit with teeth and yoke for the distributed winding, and simultaneously incorporates refrigerant passages for cooling. The integrated design allows the same component to fulfill both electromagnetic and thermal management functions without compromise
3Volume of moving object
If wave winding is used, then coil end parts are smaller, but refrigerant flow may be obstructed by the winding
Solution Approach 1:
The refrigerant passage is designed to extend in the axial direction, creating a flow path that is spatially separated from the wave winding in the radial direction. This dimensional separation allows the compact wave winding to maintain its space-saving benefits while the refrigerant flows unobstructed through the axial passage
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 motor effectively suppresses vibration and noise while maintaining a high refrigerant flow rate, improving motor efficiency and reducing copper loss, making it suitable for large applications like business-use air conditioners.
Implementation Method 1
a winding wound around the plurality of teeth of the stator core in wave winding... reduce harmonics of an induced voltage generated in the winding
Implementation Method 2
The yoke part has a refrigerant passage through which refrigerant passes in a direction of the axis... flow rate of the refrigerant can be increased
Data Source
AI summary
A motor is used in a compressor. The motor includes a stator including a stator core having a yoke part that extends in a circumferential direction about an axis and a plurality of teeth that extend from the yoke part toward the axis and are arranged in the circumferential direction, and a winding wound around the plurality of teeth of the stator core in wave winding, and a rotor whose number of poles is P and which is disposed on an inner side of the stator in a radial direction about the axis. When a number of the plurality of teeth is represented by S, S/P≥6 is satisfied. The yoke part has a refrigerant passage through which refrigerant passes in a direction of the axis.