Motor Rotation Control Using Magnetic Angle Detection
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Solution Overview
Problem
The control of rotational driving is complicated due to the need for multidimensional functional calculus to calculate the rotation angle from a gear ratio and calibration of the origin position, making existing methods cumbersome.
Innovation Solution
A driving apparatus and method that includes a rotation unit driven by a motor, a rotation angle acquisition unit to acquire information proportional to the rotation angle, and a control unit to simplify the control of the motor based on the acquired rotation angle information, allowing for straightforward rotational driving control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gear ratio method is used to calculate the rotation angle, then the rotation angle can be obtained, but the control becomes complicated due to multidimensional functional calculus
Solution Approach 1:
The patent replaces the mechanical gear ratio calculation method with a magnetic field-based detection system. A magnet is attached to the rotating body and a magnetic sensor detects its position, substituting complex mechanical calculus with direct magnetic field measurement, thereby simplifying the control system while maintaining measurement precision.
Solution Approach 2:
The patent introduces a magnet as an intermediary element between the rotating body and the detection system. This magnet serves as a mediator that enables direct angular position detection through magnetic field changes, eliminating the need for complex gear ratio calculations and origin calibration.
2Measurement precision
If origin calibration is performed to calculate the rotation angle, then the rotation angle can be determined, but the control process becomes more complex
Solution Approach 1:
The patent replaces the origin calibration process with direct magnetic field detection. By attaching a magnet to the rotating body and using a magnetic sensor to detect its position, the system obtains absolute angular information without requiring calibration procedures, thereby simplifying operation while maintaining measurement precision.
Solution Approach 2:
The magnetic detection system provides self-referential angular measurement. The magnet attached to the rotating body automatically serves as the reference marker, eliminating the need for external calibration processes. The system measures its own position directly through magnetic field changes, making the operation simpler and more intuitive.
3Measurement precision
If a rotation sensor is provided on the gear to acquire rotation angle information, then the rotation angle can be measured, but the device structure becomes more complex
Solution Approach 1:
The patent uses a magnet as an intermediary that simplifies the device structure. Instead of mounting a rotation sensor directly on the gear, a simple magnet is attached to the rotating body and a magnetic sensor on the stationary stator detects its position, reducing structural complexity while maintaining measurement precision.
Solution Approach 2:
The patent replaces mechanical rotation sensors with a magnetic field-based detection system. This substitution eliminates the need for complex mechanical sensor assemblies on the gear, using instead a simple magnet-sensor configuration that reduces device structural complexity while achieving the same measurement function.
Data Source
AI summary
There is provided a driving apparatus including: a rotation unit configured to be rotated about a center shaft by driving of a motor; a rotation angle acquisition unit configured to acquire information of a rotation angle of the rotation unit, as information proportional to the rotation angle; and a control unit configured to control the driving of the motor on the basis of the information of the rotation angle acquired by the rotation angle acquisition unit.