Motor Rotation Suppression Switch for Inclined Sliding Doors
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Solution Overview
Problem
Conventional sliding door motors experience reduced efficiency and operability issues when operating on inclined surfaces due to the suppression of rotor rotation by brake coils, leading to forceful opening or closing of sliding doors.
Innovation Solution
A motor design incorporating a switch unit interposed between the ends of the brake coils, allowing the switch to be toggled between open and closed states to control the rotation of the rotor, preventing forceful movement and maintaining efficiency by suppressing rotation only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake coils are used to suppress rotor rotation on inclined surfaces, then forceful opening or closing of sliding doors is prevented, but motor efficiency is reduced
Solution Approach 1:
The brake coil connection is made dynamic through a switch that connects the brake coil to both ends of the conducting coil only when the vehicle is detected to be on an inclined surface. This allows the system to adapt its braking function based on operating conditions, maintaining motor efficiency on flat surfaces while providing necessary control on slopes.
Solution Approach 2:
The system changes the electrical connection parameters of the brake coil based on vehicle inclination detection. When inclination is detected, the brake coil parameters change from disconnected to connected to the conducting coil ends, enabling suppression of forceful movement only when necessary.
2Reliability
If brake coils continuously suppress rotor rotation, then sliding door control is improved on slopes, but vibration and noise increase
Solution Approach 1:
The brake coil is activated periodically or conditionally rather than continuously. The switch connects the brake coil to the conducting coil ends only during specific conditions (vehicle inclination detection), creating a periodic or conditional action pattern that reduces unnecessary vibration and noise generation.
3Reliability
If brake coils are connected to both ends of conducting coil, then rotor rotation is suppressed preventing forceful movement, but operability is reduced
Solution Approach 1:
The connection between brake coils and conducting coil ends is made dynamic through a switch that responds to vehicle inclination detection. This allows the system to maintain full operability during normal operation while dynamically enabling rotation suppression only when safety concerns arise on inclined surfaces.
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 effectively prevents forceful opening or closing of sliding doors on steep slopes while maintaining motor efficiency by selectively suppressing rotor rotation, enhancing operability and reducing the risk of vibration and noise.
Implementation Method 1
an electromotive force for generating magnetic field that suppresses relative rotation between the coil holder and the field magnet holder is induced at both ends of the brake coil when a current flows in the conducting coil
Implementation Method 2
a conducting coil provided on the coil holder, where the rotor is rotated (the field magnet holder and the coil holder are rotated relative to each other) by magnetic field generated according to application of a voltage to both ends of the conducting coil
Data Source
AI summary
A motor for driving a movable body includes a cylinder portion that holds a field magnet, a coil holder disposed rotatably to the cylinder portion, a conducting coil wound on the coil holder and generates a rotational force between the same and the cylinder portion when a current flows in the conducting coil, a brake coil provided on the coil holder, where an electromotive force for generating magnetic field that suppresses relative rotation between the coil holder and the cylinder portion is induced between both ends of brake coil when a current flows in the conducting coil, and a switch interposed between the both ends of the brake coil.