Movable-Core Reciprocating Motor With Magnetic Spring Resonance
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Solution Overview
Problem
Conventional reciprocating motors face limitations in using all operation frequencies, miniaturization, motor efficiency, power consumption, and complexity due to mechanical resonance springs, leading to increased weight, air gap, and assembly difficulties.
Innovation Solution
A movable core-type reciprocating motor design with a stator comprising an inner and outer stator connected axially on one side and spaced on the other, featuring a magnet coil between them, and a mover with a magnetic core for stable reciprocation, reducing weight and air gap, and using magnetic resonance springs to enhance efficiency and reduce size.
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 for reciprocation, but the device complexity increases due to additional spring support members and the assembling process becomes difficult
Solution Approach 1:
The patent extracts and eliminates the mechanical resonance spring (compression coil spring) from the system. Instead of using a separate spring component, the invention uses the magnetic field interaction between the magnet and the movable core to provide the necessary restoring force for reciprocation, thereby removing the need for spring support members and simplifying the overall structure
Solution Approach 2:
The patent replaces the mechanical resonance spring system with a magnetic field-based system. The magnet and movable core interact through magnetic attraction and repulsion forces, substituting the mechanical spring mechanism with an electromagnetic field mechanism that achieves the same stabilizing function without the physical spring components
2Reliability
If a mechanical resonance spring made of compression coil spring is installed, then the mover can be supported, but the transverse length of the reciprocating motor cannot be reduced due to the required diameter and length of the spring
Solution Approach 1:
The patent removes the mechanical resonance spring from the system, eliminating the space requirements associated with spring diameter and length. The magnetic field interaction provides the necessary support function without requiring physical spring components that occupy transverse space
Solution Approach 2:
The mechanical spring support system is replaced with a magnetic field-based support mechanism. The magnet and movable core interact through magnetic forces that provide the necessary support and restoring forces without requiring the physical space that a compression coil spring would occupy
3Reliability
If a magnet and magnet frame with large thickness are used in the mover, then the mover can be arranged to be reciprocatable, but the weight of the entire mover increases and power consumption increases
Solution Approach 1:
The patent optimizes the thickness parameters of the magnet and movable core to minimize weight while maintaining reciprocation capability. By carefully selecting and adjusting the thickness parameters, the invention achieves the necessary magnetic interaction strength without excessive material usage, thereby reducing overall mover weight and associated power consumption
4Reliability
If the mover is arranged to be reciprocatable between outer stator and inner stator, then the motor can function, but air gaps are formed on outer and inner sides increasing the total air gap and lowering motor efficiency
Solution Approach 1:
The patent transitions from a conventional radial air gap configuration to an axial air gap configuration. By arranging the magnet and movable core to interact primarily in the axial direction rather than radially, the invention reduces the effective air gap distance that magnetic flux must traverse, thereby improving magnetic coupling efficiency and reducing energy losses
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 allows for efficient use of all operation frequencies, reduces power consumption, miniaturizes the motor, and simplifies assembly, improving motor efficiency and output while minimizing noise and friction loss.
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 reciprocates linearly with respect to the stator according to a direction of a flux generated when a current flows in a coil provided in the stator
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A movable core-type reciprocating motor includes: a stator including an inner stator and an outer stator, wherein one sides of an axial direction of the inner stator and the outer stator are connected to each other and the other sides of the axial direction are spaced from each other to form an air gap; 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.