Motor Rotation Detection Device Simplifying Sensor Configuration
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Solution Overview
Problem
Existing rotation detection devices for motors are complex in configuration, requiring multiple sensor units with different configurations that can lead to increased complexity and potential for common cause failures.
Innovation Solution
A detection device comprising a sensor with a main detection element, sub detection elements, a main digital conversion part, and a calculation part that outputs digital and analog signals, along with a control unit that includes sub digital conversion and abnormality detection parts, simplifying the configuration by using the main detection element for control and sub detection elements for abnormality detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensor units with different configurations are used for rotation detection, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The sensor is divided into multiple detection elements (first detection element and second detection element) with different configurations within a single sensor unit. Each element detects rotation differently, providing redundant detection capabilities that improve reliability without requiring multiple separate sensor units.
Solution Approach 2:
Multiple detection elements with different configurations are integrated into a single sensor unit that outputs both analog signals and digital signals. This merging approach consolidates what would traditionally require multiple separate sensor units, reducing overall system complexity while maintaining enhanced detection reliability through the combined detection capabilities.
2Reliability
If multiple sensor units are used for rotation detection, then detection reliability is improved, but the likelihood of common cause failures increases
Solution Approach 1:
The sensor unit is segmented into multiple independent detection elements that can detect rotation through different physical mechanisms. This segmentation ensures that failures in one element do not necessarily affect others, reducing the impact of common cause failures while maintaining high detection reliability through the remaining functional elements.
3Measurement precision
If digital conversion is performed for all detection elements, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Different detection elements are assigned different processing qualities based on their specific functions. The first detection element outputs analog signals for certain applications, while the second detection element with different configuration outputs digital signals for applications requiring higher precision. This local differentiation of processing quality allows precise measurement where needed without unnecessarily increasing complexity throughout the entire sensor system.
Solution Approach 2:
Digital conversion is applied selectively to only those detection elements or signal paths where it provides necessary precision improvement, rather than universally applying digital conversion to all detection elements. This partial application of digital conversion achieves sufficient measurement precision for critical functions while avoiding the unnecessary complexity and cost of digital processing where analog signals are adequate.
Data Source
AI summary
A sensor of a detection device includes at least one main detection element, at least one sub detection element, a main digital conversion part that digitally converts a detection signal of the main detection element, and a calculation unit that calculates a state information using the digitally converted detection signal of the main detection element. The sensor outputs a digital signal having a state information and an analog signal according to the detection signal of the sub detection elements. A control unit includes a sub digital conversion part that converts an analog signal into digital, and an abnormality detection part that performs an abnormality detection using a main information and a sub information. The abnormality detection part performs an abnormality detection using a value obtained by converting an analog signal into state information as sub information, or a value obtained by converting state information into analog output as main information.