Multiturn Angle Detection With Single-Sensor Pulse Correction
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Solution Overview
Problem
Existing multiturn angle detection devices are hindered by size and cost issues due to the use of multiple power generation sensors, and they struggle with pulse missing and complex signal processing when detecting rotation direction changes.
Innovation Solution
A multiturn angle detection device using a single power generation sensor, a segment counter, and a precision absolute angle detector, with a magnetic field generation source and a sensor element, generates precise multiturn angle values by combining count values with simple correction processes, eliminating the need for complex signal processing and reducing device size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple power generation sensors are used to detect rotation direction changes, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent divides the detection function into two segments: a power generation sensor for detecting rotation direction changes and generating pulse signals, and a separate sensor element for detecting magnetic field polarity. This segmentation allows each component to focus on a specific function, reducing the need for multiple power generation sensors while maintaining detection precision through coordinated operation.
Solution Approach 2:
The patent introduces a sensor element as an intermediary that detects magnetic field polarity and provides this information to the control unit. This intermediary enables the system to determine rotation direction and correct pulse missing without requiring multiple power generation sensors, thereby simplifying the device while maintaining measurement precision.
2Measurement precision
If multiple power generation sensors are used to detect rotation direction changes, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the detection system into a power generation sensor and a separate sensor element, allowing each to be manufactured independently using standard components. This reduces the need for multiple expensive power generation sensors and simplifies assembly, thereby lowering manufacturing cost while maintaining angle detection precision through the coordinated function of the segmented components.
Solution Approach 2:
The patent replaces multiple expensive power generation sensors with a combination of a single power generation sensor and a cheaper sensor element. The sensor element, being simpler and less expensive, serves the additional function of detecting magnetic field polarity, thereby reducing overall manufacturing cost while maintaining the required measurement precision.
3Measurement precision
If pulse missing occurs during rotation direction changes, then measurement precision deteriorates, but complex signal processing is required to correct it
Solution Approach 1:
The patent performs preliminary action by having the sensor element continuously detect magnetic field polarity and provide this information to the control unit in advance. This preliminary detection of polarity states enables the control unit to anticipate and correct pulse missing during rotation direction changes, maintaining measurement precision without requiring complex real-time signal processing.
Solution Approach 2:
The patent implements feedback by using the sensor element to continuously monitor magnetic field polarity and feed this information back to the control unit. The control unit then uses this feedback to determine rotation direction and correct pulse missing, maintaining measurement precision through a simple feedback mechanism rather than complex signal processing.
4Device complexity
If a single power generation sensor is used, then device size and cost are reduced, but pulse missing occurs during rotation direction changes
Solution Approach 1:
The patent introduces a sensor element as an intermediary that detects magnetic field polarity and provides this information to the control unit. This intermediary enables the single power generation sensor to maintain reliable detection during rotation direction changes by allowing the control unit to use polarity information to correct pulse missing, thereby improving detection reliability without increasing sensor quantity.
Solution Approach 2:
The patent uses feedback from the sensor element that continuously monitors magnetic field polarity and feeds this information to the control unit. This feedback mechanism enables the control unit to detect rotation direction changes and correct pulse missing, improving the reliability of the single power generation sensor system without requiring additional sensors.
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 device achieves precise multiturn angle detection with reduced size and cost by using a single power generation sensor, correcting for pulse missing with a simple correction process, and integrating a nonvolatile memory for energy-efficient operation.
Implementation Method 1
Magnetic wires having a large Barkhausen effect (large Barkhausen jump) are known in the name of Wiegand wire or pulse wire
Implementation Method 2
A power generation sensor is produced by winding a coil around the magnetic wire... the reversal of the magnetization direction starts at a certain position of the magnetic wire to propagate to the entire wire, whereby the magnetization direction of the soft layer is totally reversed. At this time, the large Barkhausen effect is exhibited to induce a pulse signal in the coil wound around the magnetic wire
Implementation Method 3
Where an alternating magnetic field is applied to the power generation sensor, two pulse signals including one positive pulse signal and one negative pulse signal are generated per each cycle
Data Source
Figure 1
Figure 2A~2C
Figure 3A
AI summary
A multiturn angle detection device includes: a segment counter to generate a count value by counting segments defined by dividing the single-turn cycle of a rotating body into two in an angular range over the single turn of the rotating body; a precision absolute angle detector to generate an absolute angle detection value within the single-turn cycle at a higher resolution; and an arithmetic device to generate a multiturn absolute angle detection value by combining the count value with the absolute angle detection value. The segment counter includes a power generation sensor, a magnetic field generation source, a sensor element, and a nonvolatile memory to store the count value and information identifiable of pulse information. The pulse information includes a sensor element output state and a voltage pulse polarity. The magnetic field generation source applies a two-cycle alternating magnetic field per each turn axially of the magnetic wire. The arithmetic device performs computation for the combining by using the count value and the information identifiable of the pulse information stored in the nonvolatile memory when receiving external electric power supply.