Movable Stopper Section for Stepping Motor Impact Resistance
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Solution Overview
Problem
Existing display apparatuses with stepping motors in devices like timepieces and meters can have their rotor misalignment issues due to external impacts, causing the stepping motor to fail operation when the pointer is pressed against the stopper section, leading to a failure in rotating the rotor even when an alternating magnetic field is generated.
Innovation Solution
Incorporating a movable supporting section, such as a rotating interlocking plate, eccentric rotating bodies, or flat springs, that can move and return the stopper pins to their original positions, ensuring the rotor remains aligned and can rotate even after external impacts, thus maintaining the operation of the stepping motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stopper section is fixed to restrict the pointer movement range, then the pointer position is accurately restricted, but external impact causes rotor misalignment leading to stepping motor failure
Solution Approach 1:
The stopper section is made movable rather than fixed, allowing it to dynamically adjust its position in response to external impacts. The stopper section can move along the pointer shaft when the pointer presses against it during impact, absorbing the shock and preventing force transmission that would cause rotor misalignment. This dynamic capability maintains reliable stepping motor operation under impact conditions.
Solution Approach 2:
The movable stopper section acts as a cushioning mechanism that anticipates and absorbs external impacts before they can transmit force to the rotor. By allowing the stopper section to move and deform under impact load, it protects the rotor from misalignment caused by sudden external forces, ensuring continuous reliable operation of the stepping motor.
2Object-affected harmful factors
If the stopper section is made movable to absorb impact, then external impact resistance is improved, but the structure becomes more complex
Solution Approach 1:
The stopper section utilizes a flat spring as a flexible element to absorb impact forces. The flat spring provides the necessary flexibility and movement capability while maintaining a simple, compact structure. This approach achieves impact resistance without requiring complex mechanical assemblies, keeping the overall device structure simple and manufacturable.
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 solution ensures the stepping motor can be unfailingly operated even after external impacts, maintaining the rotor's alignment and enabling continuous operation by moving and returning the stopper pins to their original positions, thus ensuring the display apparatus functions correctly.
Implementation Method 1
by current being sent to the coil section, an alternating magnetic field is generated in the stator
Implementation Method 2
by the alternating magnetic field, the rotor including a magnet is rotated in steps of 180 degrees
Data Source
AI summary
A display apparatus characterized by having a scale mark display section which is provided in a predetermined display area; a pointer which moves on the scale mark display section and indicates a scale mark in the scale mark display section; a stepping motor which drives the pointer; a stopper section which is positioned in an end section of the scale mark display section and which restricts movement range of the pointer; and a movable supporting section which movably supports the stopper section.