Movable Core Reciprocating Motor Magnetic Spring Stiffness
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Solution Overview
Problem
Conventional reciprocating motors face limitations in using all operation frequencies, miniaturization, motor efficiency, power consumption, and magnetic air gap reduction due to mechanical resonance springs and increased weight, leading to complex structures and reduced efficiency.
Innovation Solution
A movable core-type reciprocating motor design with a stator and outer stator connected axially, a magnet coil between them, and a movable core made of magnetic material exposed to the air gap, supported by a non-magnetic connection member to minimize magnetic air gap and weight, enhancing magnetic spring stiffness and reducing assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical resonance spring made of compression coil spring is installed to support the mover, then the mover can be stabilized during reciprocation, but the transverse length of the reciprocating motor increases and certain operation frequencies cannot be used
Solution Approach 1:
The patent replaces the mechanical resonance spring (compression coil spring) with a magnetic spring system. The magnetic spring is formed by magnetic attraction forces between the mover and stator, eliminating the need for mechanical springs. This substitution resolves the contradiction by providing mover stability without increasing transverse length or restricting operation frequencies.
Solution Approach 2:
The patent changes the fundamental parameter of the spring mechanism from mechanical (compression coil) to magnetic (field-based). By adjusting magnetic field strength and distribution, the magnetic spring can provide the necessary stabilizing force while maintaining a compact structure and enabling full frequency range operation.
2Reliability
If a mechanical resonance spring made of compression coil spring is installed to support the mover, then the mover can be stabilized during reciprocation, but the mechanism structure becomes complicated and assembly becomes difficult
Solution Approach 1:
The patent eliminates the complex mechanical spring support structure by replacing it with a magnetic spring system. The magnetic spring is inherently integrated into the motor structure through magnetic field interactions, significantly simplifying the overall mechanism and making assembly much easier while maintaining mover stability.
Solution Approach 2:
The patent merges the spring support function with the motor structure itself. The magnetic spring is formed by the interaction between the mover and stator components that already exist in the motor, eliminating the need for separate spring support mechanisms and reducing overall structural complexity.
3Stability of the object's composition
If a magnet and magnet frame with large thickness are used in the mover, then the magnet can be securely held, but the weight of the mover increases and motor efficiency decreases
Solution Approach 1:
The patent changes the magnet frame from a thick mechanical structure to a thin magnetic circuit structure. By optimizing the magnetic circuit design and using high-permeability materials, the magnet can be securely retained with minimal frame thickness, significantly reducing mover weight while maintaining magnet retention.
Solution Approach 2:
The patent employs composite material strategies by using high-permeability magnetic materials for the magnet frame and optimizing the magnetic circuit. This allows for a thin yet effective magnet retention structure that minimizes weight while maintaining structural integrity and magnetic retention.
4Ease of operation
If air gaps are formed on the outer and inner sides of the mover for reciprocation, then the mover can move freely, but the total air gap increases and motor efficiency is lowered
Solution Approach 1:
The patent optimizes the air gap parameters by minimizing the gap dimensions while maintaining sufficient space for mover reciprocation. By precisely controlling and reducing the air gap thickness, the motor efficiency is improved while still allowing free mover movement. The magnetic spring design also helps maintain consistent gap spacing.
Solution Approach 2:
The patent employs a magnetic spring system that dynamically adjusts to maintain optimal air gap spacing during mover reciprocation. The magnetic attraction forces automatically compensate for gap variations, ensuring minimal and consistent air gaps that reduce energy loss while allowing full range of motion.
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 design allows for efficient use of all resonance frequencies, miniaturization, reduced power consumption, increased motor output, and improved efficiency by minimizing magnetic air gap and weight, while simplifying manufacturing and assembly.
Implementation Method 1
a magnet coil for generating an induction magnetic field is wound on either the inner stator or the outer stator
Implementation Method 2
The mover having a magnet is rotated or reciprocated according to a direction of a flux generated when a current flows in a coil provided in the stator
Data Source
Figure 1
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AI summary
A movable core-type reciprocating motor according to the present invention includes: a stator including an inner stator and an outer stator, a magnet coil wound between the inner stator and the outer stator; a magnet fixed to at least one of the inner stator and the outer stator so as to be at least partially positioned within a range of the air gap; and a mover including a movable core disposed in the air gap and made of a magnetic material to perform a reciprocation movement with respect to the stator and the magnet and a connection member made of a non-magnetic material and configured to support the movable core.