Motor Sensor Coil Layout for Accurate Rotor Position Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motors with complex structures and vulnerable components face manufacturing challenges and are susceptible to external forces and magnetism, leading to assemblability issues.
Innovation Solution
A motor design utilizing a rotor with a yoke and protrusions to detect position through magnetic induction, simplifying the structure and reducing components by using a yoke to fix a magnet for magnetic induction, and incorporating a substrate with coils and sensors to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a code wheel, light source, and optical sensor are used to detect rotor position, then position detection is achieved, but the structure becomes complex and the motor becomes vulnerable to external forces
Solution Approach 1:
The patent extracts and eliminates the complex optical detection system (code wheel, light source, optical sensor) by adopting a simplified magnetic field-based detection approach using a Hall sensor and magnet, thereby reducing structural complexity while maintaining position detection capability
Solution Approach 2:
The patent replaces the mechanical/optical detection system with an electromagnetic field-based detection system using magnets and Hall sensors, substituting complex mechanical structures with simpler electromagnetic sensing mechanisms
2Measurement precision
If a sensing magnet magnetized in a multipolar is used to detect rotor position, then position detection is achieved, but the sensing magnet becomes vulnerable to external magnetism and has low assemblability
Solution Approach 1:
The patent merges the position detection function with the rotor structure itself by integrating magnets directly into the rotor, eliminating the need for separate sensing magnets and improving both reliability and assemblability while maintaining detection precision
3Measurement precision
If a complex motor structure with multiple components is used, then position detection capability is achieved, but manufacturing process becomes complex
Solution Approach 1:
The patent combines multiple components (magnets, sensor, housing) into an integrated assembly where the magnet is directly mounted on the rotor and the Hall sensor is fixed on the housing, significantly simplifying the manufacturing process while maintaining position detection precision
Solution Approach 2:
The rotor housing serves multiple functions: it provides structural support, houses the magnet, and acts as the mounting surface for the Hall sensor, thereby reducing the total number of components and simplifying manufacturing
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 simplified structure reduces component count, enhances assembly ease, prevents foreign matter and water ingress, and improves rotor position detection accuracy with reduced error.
Implementation Method 1
a motor utilizing a rotor with a yoke and protrusions to detect position through magnetic induction
Implementation Method 2
The rotor rotates due to electromagnetic interaction with the stator, and when rotor rotates, the shaft rotates
Data Source
AI summary
An embodiment may provide a motor including a shaft, a rotor including a rotor core and a coil disposed on the rotor core, a stator disposed outside the rotor, a substrate electrically connected to the coil, and a first housing in which the substrate is disposed and which is coupled to the shaft and the rotor, wherein the substrate includes a sensor and a coil connected to the sensor, the first housing includes a hole, the stator includes a yoke and a magnet disposed on the yoke, the yoke includes a plurality of protrusions, and the protrusions and the hole are disposed to overlap the coil in an axial direction.