Partial Sensor Board for Electric Motor Position Detection
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Solution Overview
Problem
Conventional electric working machines face challenges in manufacturing sensor boards due to the requirement of forming them in a doughnut shape to cover the entire circumference of the rotor, leading to a deteriorated yield ratio.
Innovation Solution
The electric working machine design includes a sensor board that only partially covers the rotor, with a broader portion not covering the rotor, allowing for improved yield ratio by simplifying the manufacturing process and incorporating a resin seat surface for temperature regulation and secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor board is formed in a doughnut shape to cover the entire circumference of the rotor, then the magnetic field detection is improved, but the yield ratio of the sensor board is deteriorated
Solution Approach 1:
The patent extracts only the necessary portion of the sensor board that covers the rotor, removing the unnecessary doughnut-shaped structure. The sensor board is designed to cover only the area where the rotor is located, rather than forming a complete ring around it, which simplifies manufacturing and improves yield ratio while maintaining detection functionality.
Solution Approach 2:
Instead of covering the entire circumference of the rotor with the sensor board, the patent applies partial coverage - the sensor board covers only the necessary area to detect magnetic field variations from the rotor. This partial action approach reduces material waste and improves manufacturing yield while still achieving the required detection precision.
2Measurement precision
If the sensor board covers the entire circumference of the rotor, then the detection coverage is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent extracts only the essential functional area of the sensor board, removing the complex doughnut-shaped structure that requires covering the entire rotor circumference. This simplifies the manufacturing process while maintaining adequate detection coverage for motor control applications.
3Measurement precision
If the sensor board is positioned close to the rotor for accurate detection, then the measurement precision is improved, but the temperature increase of the sensor board is worsened
Solution Approach 1:
The patent applies local quality by providing heat dissipation structures specifically at the sensor board area, while maintaining close proximity to the rotor for accurate magnetic field detection. The sensor board has a broader portion that extends away from the rotor to facilitate heat dissipation, creating different thermal zones in different areas of the same component.
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 design enhances the yield ratio of the sensor board, suppresses temperature increase, and reduces errors in rotational position detection due to vibration, while maintaining effective magnetic field detection.
Implementation Method 1
a sensor board including a magnetic sensor configured to detect magnetic variation due to rotation of the rotor
Data Source
AI summary
The present application discloses an electric working machine. The electric working machine includes: a motor including a rotor; a sensor board including a magnetic sensor for detecting magnetic variation due to rotation of the rotor; and a housing which contains the motor and the sensor board. in the electric working machine, the sensor board does not cover an entire circumference of the rotor. In the electric working machine, the sensor board has a portion covering the rotor, and a portion not covering the rotor.