Absolute Encoder Gear Magnet Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional absolute encoders face reliability issues due to misalignment of magnetic field centers and unsynchronized rotations, leading to inaccurate angular position detection.
Innovation Solution
The design incorporates a first driving gear, a first driven gear, a second driving gear, and a second driven gear with a magnet on a cylindrical member, along with a coming-out preventing member to securely hold the magnet and maintain alignment, enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic field generating element is provided at one end of the layshaft, then the absolute encoder can detect angular positions, but the magnetic detecting element may not be able to detect appropriate angular position if centers are misaligned or rotations are not synchronized
Solution Approach 1:
A magnetic detecting element is provided at one end of the spindle to detect the magnetic pole position of the permanent magnet. This intermediary detection mechanism compensates for misalignment between centers and asynchrony in rotations, enabling accurate angular position detection even when the magnetic field generating element (permanent magnet) is not perfectly aligned with the detecting element.
2Measurement precision
If a permanent magnet is provided on the layshaft, then the absolute encoder can measure absolute position, but the magnet may come out in the axial direction reducing reliability
Solution Approach 1:
A coming-out preventing member is provided on the cylindrical member to prevent the permanent magnet from coming out in the axial direction. This preventive structure is built into the design beforehand, ensuring the magnet remains securely positioned during operation without requiring additional external retention mechanisms.
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 provides a more reliable absolute encoder capable of accurately detecting angular positions, reducing errors caused by misalignment and unsynchronized rotations.
Implementation Method 1
a permanent magnet provided on a cylindrical member where the second driven gear is formed
Implementation Method 2
a magnetic detecting element provided at one end of the spindle and configured to detect a magnetic pole position of the permanent magnet
Data Source
AI summary
An absolute encoder suitable for size reduction is provided.An absolute encoder includes: a first driving gear configured to rotate according to rotation of a spindle; a first driven gear having a center axis perpendicular to a center axis of the first driving gear and configured to engage with the first driving gear; and a second driving gear provided coaxially with the first driven gear and configured to rotate according to rotation of the first driven gear. The absolute encoder includes a permanent magnet (8) provided on a layshaft gear (5A) having a center axis perpendicular to the center axis of the first driven gear and where a worm wheel portion (52e) is formed to engage with the second driven gear; and a resin sheet (5A1) provided on the layshaft gear (5A) to prevent the permanent magnet (8) from coming out from the layshaft gear (5A) in the axial direction.