Magnetic Composite Rotor Encoder for Precise Motor Speed Detection
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Solution Overview
Problem
Existing speed detection methods for electric motors using voltage changes and sensors in control circuitry often produce inaccurate results and require significant space within the motor, necessitating higher-capacity controllers.
Innovation Solution
An electric motor with a magnetic encoder comprising a magnetic composite part attached to the rotor and a magnetic flux sensor to detect magnetic flux, utilizing a ferrite powder embedded in a thermoplastic matrix, which provides accurate speed and position detection without the need for additional space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage changes and sensors are used for speed detection, then speed detection capability is provided, but measurement precision and device space requirements deteriorate
Solution Approach 1:
The patent combines the encoder function with existing motor components by attaching a magnetic composite part to the rotor and using a magnetic flux sensor that integrates with the motor's control circuitry. This merging approach eliminates the need for separate sensor components and additional space while maintaining accurate speed and position detection capabilities.
Solution Approach 2:
The magnetic flux sensor serves multiple functions: it detects magnetic flux changes for speed detection, determines rotor position, and integrates with the existing control circuitry. This multi-functionality reduces the need for dedicated speed detection hardware and minimizes space requirements within the motor.
2Measurement precision
If conventional sensors are mounted in control circuitry, then speed detection is enabled, but device complexity and space requirements increase
Solution Approach 1:
The patent merges the speed detection function with the motor's existing control circuitry by using a magnetic flux sensor that can be integrated into the control system. This eliminates the need for separate sensor components and reduces overall device complexity while maintaining accurate speed detection.
Solution Approach 2:
The magnetic composite part attached to the rotor generates the magnetic flux patterns necessary for detection, and the magnetic flux sensor utilizes these patterns directly without requiring additional processing or conversion components. The system serves itself by using the motor's own rotational movement to generate the detection signal.
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 magnetic encoder offers precise speed and position detection, reduces the need for additional space, and integrates seamlessly with the motor, enhancing operational efficiency and reducing the requirement for higher-capacity controllers.
Implementation Method 1
a magnetic flux sensor positioned to detect magnetic flux resulting from movement of the magnetic composite part with rotation of the rotor
Implementation Method 2
magnetic composite material comprising a ferrite powder imbedded within a thermoplastic matrix
Data Source
AI summary
An electric motor including a rotor defining an axis of rotation and an encoder. The encoder includes a magnetic composite part attached to the rotor, and a magnetic flux sensor positioned to detect magnetic flux resulting from movement of the magnetic composite part with rotation of the rotor.