Motor Rotation Sensor with Movable Detecting Member
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Solution Overview
Problem
Existing motor rotation detection sensors face challenges in easily changing the waveform of rotation detection signals, requiring redesign of permanent magnets and magnetic sensors' locations and numbers.
Innovation Solution
A sensor system with a detected plate having rod-shaped portions of varying lengths on a rotating shaft, a detecting member that outputs signals with changing waveforms, and a movable member that adjusts the detecting member's position to switch the number of detected rod-shaped portions, allowing easy modification of the waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the waveform of rotation detection signals needs to be changed, then the detection capability is improved, but the device complexity increases due to redesign of permanent magnets and magnetic sensors
Solution Approach 1:
The detected plate is segmented into multiple rod-shaped portions with different lengths, where each rod-shaped portion corresponds to a specific waveform pattern. By selectively detecting different numbers of these segmented portions, various waveform patterns can be achieved without redesigning the entire sensor system.
Solution Approach 2:
The detecting member is made movable along the rotational direction of the rotating shaft, allowing dynamic adjustment of its position. This enables selective detection of different numbers of rod-shaped portions, thereby dynamically changing the output waveform pattern without physical redesign of the sensor components.
2Measurement precision
If the number of permanent magnets and magnetic sensors is increased to change waveform, then the detection precision is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
Instead of requiring complete sets of permanent magnets and magnetic sensors for each waveform pattern, the invention uses a single detecting member that can partially detect different numbers of rod-shaped portions. This partial detection approach achieves multiple waveform patterns without the excessive action of multiplying sensor components.
Solution Approach 2:
A single detecting member serves multiple functions by detecting different numbers of rod-shaped portions at different positions. This universal detecting member replaces what would traditionally require multiple specialized sensors, simplifying manufacturing while maintaining detection precision.
3Device complexity
If the detecting member position is fixed, then the device simplicity is maintained, but the waveform flexibility is reduced
Solution Approach 1:
The detecting member is designed with movable capability along the rotational direction while maintaining a relatively simple structural configuration. This dynamic positioning ability allows the system to achieve waveform flexibility without significantly increasing device complexity, as the movement mechanism is integrated into the existing sensor 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
Enables straightforward alteration of the waveform of rotation detection signals without the need for extensive redesign, ensuring flexible and adaptable motor rotation detection.
Implementation Method 1
a magnetic sensor, which detects a leakage flux leaked from this permanent magnet, for detection of a rotation of the motor
Data Source
AI summary
A sensor for motor includes: a detected plate mounted to a rotating shaft of a motor, the detected plate including a plurality of rod-shaped portions having different lengths from one another, the plurality of rod-shaped portions radially projecting from the rotating shaft; a detecting member configured to output a signal having a waveform that changes according to the rod-shaped portions passing through a front of the detecting member; and a movable member that holds the detecting member.