Motor Angle Sensing With Non-Quadrature Phase Logic Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional angle detection devices for brushless motors have complex configurations, making it difficult to reduce the overall cost of the driving circuit due to the intricate setup of the angle detector and logic signal generator.
Innovation Solution
An angle detection device with a simplified configuration that uses an angle sensor to generate first and second detection signals with a phase difference not being an integer multiple of 90°, and a logic signal generator to produce three logic signals with distinct phases, thereby reducing the complexity and cost of the driving circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional angle detection devices are used, then the motor control function is achieved, but the device complexity and cost increase due to complicated configuration of the angle detector and logic signal generator
Solution Approach 1:
The patent combines the angle detection function and logic signal generation function into a single integrated device. The angle detection device generates both the angle detection signal and the three-phase logic signals simultaneously, eliminating the need for separate logic signal generation circuits and reducing overall system complexity while maintaining reliable motor control.
Solution Approach 2:
The angle detection device is designed to perform multiple functions: it detects the rotation angle of the motor and simultaneously generates the three-phase logic signals required for motor control. This multi-functional approach reduces the number of separate components needed and simplifies the overall system configuration.
2Measurement precision
If conventional angle detectors with multiple magnetic detection elements are used, then accurate angle detection is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent changes the operational parameters of the angle detection device by using a single magnetic detection element that operates at multiple different detection directions (0°, 60°, 120°, 180°, 240°, 300°). This parameter-based approach replaces the need for multiple physical detection elements, reducing manufacturing cost while maintaining accurate angle detection precision through computational processing of the detection signals.
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 solution enables a more cost-effective and simplified configuration for the angle detection device, allowing for efficient generation of logic signals for motor control, which improves the overall efficiency and reduces the need for additional components like temperature sensors.
Implementation Method 1
an angle sensor configured to detect a rotating magnetic field MF and output a first detection signal S1 and a second detection signal S2
Data Source
AI summary
An angle detection device includes an angle sensor configured to detect a rotating magnetic field that changes periodically in response to a rotation angle of a motor and output a first detection signal and a second detection signal having a phase difference whose value is not an integer multiple of 90°, and a logic signal generation section configured to generate a first logic signal using the first detection signal, generate a second logic signal having a phase different from that of the first logic signal using the second detection signal, and generate a third logic signal having a phase different from those of the first and second logic signals using the first and second logic signals.