Integrated Yoke Step Motor for Camera Actuation
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Solution Overview
Problem
Conventional step motors for cameras using multiple yoke irons complicate structure and manufacturing, making it difficult to achieve high precision and accuracy, and increasing costs due to complex installation and assembly requirements.
Innovation Solution
A step motor design featuring a yoke iron with integral magnetic poles, two windings, and a rotatable magnet with a cylindrical iron core, where the magnet is balanced by magnetic forces and rotates to move a driven member through an actuating axle, simplifying the structure and improving assembly precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple yoke irons are used to form multiple magnetic fields, then the magnetic field control capability is improved, but the structure complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple separate yoke irons into a single integrated yoke iron structure that contains all magnetic poles (N1, N2, N3, N4 and S1, S2, S3, S4). This consolidation maintains the capability to form multiple magnetic fields through the windings while eliminating the complexity of assembling and aligning multiple separate yoke components, thus resolving the contradiction between magnetic field control precision and structure complexity.
2Manufacturing precision
If multiple yoke irons are used to form multiple magnetic fields, then the magnetic field control capability is improved, but the installation precision and assembly difficulty worsen
Solution Approach 1:
By integrating all magnetic poles into a single yoke iron piece, the patent eliminates the need for precise alignment and assembly of multiple separate yoke irons. The single integrated structure ensures consistent magnetic field distribution and eliminates assembly-related precision issues, while the modular design with standardized windings maintains ease of manufacture.
3Manufacturing precision
If multiple yoke irons are used, then the magnetic field distribution is improved, but the manufacturing cost increases
Solution Approach 1:
The patent reduces manufacturing cost by consolidating multiple yoke irons into one single yoke iron structure. This reduction in component count directly lowers material costs, manufacturing complexity, and assembly requirements, while the integrated design maintains accurate magnetic field distribution through proper winding configuration around the unified yoke structure.
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 enhances precision and accuracy of magnetic field control, reduces manufacturing complexity and costs by using fewer components, and facilitates easier assembly while maintaining accurate motion transmission.
Implementation Method 1
The magnet is rotatably floating among the magnetic poles of the yoke iron by a magnetic force
Implementation Method 2
By means of the respective windings to change the magnetic fields of the yoke irons, the magnet and the yoke irons are induced, thereby causing a motion
Data Source
AI summary
A step motor mounted inside a camera for moving a driven member is disclosed to include a yoke iron, which has a base, two arms respectively extended from two sides of the base, and four magnetic poles respectively formed on the free ends of the arms and each junction between the base and the arms, two windings respectively surrounding the two arms of the yoke iron, a magnet, which is rotatably floating among the magnetic poles of the yoke iron by a magnetic force has sectors of different magnetic poles abutted against one another, and a crank, which is coupled to and rotatable with the magnet and has an actuating axle connected to the driven member of the camera for moving the driven member upon rotation of the magnet.