Compressor Motor Rotor Magnet Segmentation for Vibration Control
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Solution Overview
Problem
Conventional motors used in compressors generate sounds and vibrations due to the movement of magnets within slots caused by magnetic forces, leading to collisions with the slot surfaces.
Innovation Solution
The motor design features two magnets in each slot, arranged to be mutually separated by magnetic forces, with slots and magnets formed in a chord-like shape to prevent reciprocal movement and reduce vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one magnet is provided in each slot of the rotor, then the motor structure is simple, but the magnet moves reciprocatingly in the slot due to magnetic forces and collides with the inner surfaces, generating sounds and vibrations
Solution Approach 1:
The patent divides a single magnet in each slot into two separate magnets arranged side by side in the circumferential direction. This segmentation allows the magnetic forces to act on both magnets simultaneously, creating balanced forces that prevent reciprocating motion and collisions, thereby eliminating sounds and vibrations while maintaining structural simplicity
Solution Approach 2:
The two magnets in each slot are positioned to receive opposing magnetic forces from the stator teeth. The magnetic attraction on one magnet is counterbalanced by the magnetic attraction on the other magnet, creating a balanced force system that prevents the magnets from moving reciprocally and colliding with the slot inner surfaces
2Ease of manufacture
If the slot is set larger than the magnet to fit the magnet in the slot, then the magnet can be installed, but the magnet becomes movable in the circumferential direction and collides with the inner surfaces of the slot
Solution Approach 1:
By segmenting the single magnet into two smaller magnets, the patent maintains the necessary clearance for installation while the dual-magnet configuration creates balanced magnetic forces that prevent harmful reciprocating motion and collisions during operation
3Object-generated harmful factors
If two magnets are provided in each slot arranged to be mutually separated by magnetic forces, then the magnets are fixed on both sides of the slot preventing vibrations, but the device complexity increases
Solution Approach 1:
The segmentation of one magnet into two creates a configuration where the magnets are naturally positioned on both sides of the slot, achieving vibration prevention through balanced magnetic forces without requiring complex additional structures or arrangements
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 prevents sounds and vibrations by fixing the magnets on both sides of the slots, maintaining magnetic balance and reducing rotor torque, while allowing for simple formation and assembly.
Implementation Method 1
electromagnetic attraction forces by the stator 120 are exerted on the one slot 111 (the rotor 110), and an attraction force (arrow E 1) exerted on the left-hand side of the one slot 111 is larger than an attraction force (arrow F 1) exerted on the right-hand side of the one slot 111
Implementation Method 2
the magnet is consistently pulled rightward and leftward in the circumferential direction of the rotor by the magnetism of the stator, and the magnet vibrates in the circumferential direction of the rotor in the slot due to the out-of-balance of the rightward and leftward forces
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Two magnets (12, 12) in a circumferential direction of a rotor (10) are provided in each slot (11a) of the rotor (10). The two magnets (12, 12) are consistently pulled in a direction in which they are mutually separated by magnetism of a stator (20) and fixed on inner surfaces on both sides of the slot (11a) in the circumferential direction of the rotor (10).