Rotor Magnet Holder Layout for Dynamic Unbalance Suppression
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Solution Overview
Problem
Conventional rotor structures in motors experience dynamic unbalance and motor characteristic deterioration due to the magnet's center of gravity deviating from the rotor's central position, leading to inefficient magnetic flux contribution and potential motor performance issues.
Innovation Solution
A motor design with a rotor core and magnet holders at both ends of the rotor core to restrict magnet movement, ensuring the magnet's central position is between the stator and rotor cores, with specific length ratios between the holders, magnet, and rotor core to maintain balance and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the magnet moves toward the end surface side of the rotation shaft, then the magnet can be positioned to generate magnetic field, but the center of gravity moves away from the central position of the rotation shaft causing large dynamic unbalance
Solution Approach 1:
The patent intentionally creates asymmetric positioning where the magnet's central position is deliberately deviated from the rotor core's central position in the axial direction. This asymmetric arrangement allows the magnet to be positioned optimally for magnetic field generation while the holders compensate for the imbalance, resolving the contradiction between power generation and dynamic stability.
Solution Approach 2:
The holders positioned at both ends of the rotor core act as counterbalancing elements. By strategically positioning these holders, the patent compensates for the dynamic unbalance caused by the magnet's offset position, effectively using the holders as counterweights to maintain rotational stability while allowing the magnet to generate sufficient magnetic field.
2Stability of the object's composition
If the center of gravity of the magnet is moved toward the central position of the rotor, then dynamic unbalance is reduced, but the central position of the magnet deviates from the axial central position of the stator causing deterioration in motor characteristics
Solution Approach 1:
The patent maintains deliberate asymmetric positioning between the magnet and stator core centers, recognizing that perfect symmetry would optimize dynamic balance but sacrifice motor performance. The asymmetric configuration allows the magnet to be positioned to maximize effective magnetic flux contribution to rotational torque while the holders manage the resulting dynamic characteristics.
Solution Approach 2:
The patent optimizes specific dimensional parameters - the lengths L1, L2, and L3 - to achieve the desired balance between dynamic stability and motor performance. By carefully controlling these length parameters, the system allows magnet position deviation from the rotor center while maintaining acceptable dynamic characteristics and maximizing motor output.
3Stability of the object's composition
If holders are provided to restrict magnet movement, then magnet position stability is improved, but device complexity increases
Solution Approach 1:
The patent divides the rotor structure into distinct functional segments: the rotor core, the magnet, and the holders. This segmentation allows each component to be optimized independently - the holders can be specifically designed for position restraint while the magnet focuses on field generation and the rotor core provides structural support, achieving stable magnet positioning without excessive overall complexity.
Solution Approach 2:
The holders serve as intermediary elements between the magnet and the rotor core. Rather than directly fixing the magnet to the rotor core or using complex mounting structures, the holders act as simple mediating components that provide the necessary position restraint with minimal structural complexity, effectively isolating the magnet while maintaining overall system simplicity.
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 configuration effectively suppresses dynamic unbalance and maintains motor performance by ensuring the magnet's magnetic flux contributes optimally to rotational torque, preventing motor characteristic deterioration.
Implementation Method 1
when electric power is supplied to the winding, a predetermined magnetic field is formed in the stator, and in response to this magnetic field, a magnetic attractive or repulsive force is generated between the magnetic field and the magnet, whereby the rotor continuously rotates
Implementation Method 2
a predetermined magnetic field is formed in the stator, and in response to this magnetic field, a magnetic attractive or repulsive force is generated
Implementation Method 3
two holders provided at both ends of the rotor core in an axial direction of the rotation shaft to restrict a movement of the magnet in the axial direction
Data Source
AI summary
Provided are a motor with which dynamic unbalance of a rotor can be suppressed, and a deterioration in the motor characteristics can be reduced, and a method for manufacturing said motor. In a motor unit: a rotor central position, a magnet central position, and a stator central position are offset from one another; a length L1 between inner wall surfaces, facing one another in an axial direction, of magnet holders, an axial direction magnet length L2 of magnets, and an offset length L3 satisfy L1−L2<L3; and first and second holder lengths Lh are the same.