Hall Element Rotational Angle Detection Circuit for Sample Analysis

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Solution Overview

Problem

Existing rotational angle detection methods for sample analysis substrates lack precision, particularly when detecting light emission or fluorescent emission, and often require bulky encoders that interfere with light detection, necessitating a more accurate and compact solution.

Innovation Solution

A rotational angle detection circuit utilizing a brushless motor with Hall elements, a phase detection circuit, and an angle calculation circuit to accurately determine the rotational angle of the substrate, eliminating the need for bulky encoders and enhancing precision.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an encoder is used to detect rotational angle, then measurement precision is improved, but device complexity and size increase

Engineering Contradiction:

Improverotational angle detection precisionVSAvoiddetection system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the rotational angle detection function from the bulky encoder system and implements it using minimal components: a Hall element and simple calculation circuits. This removes the harmful complexity while preserving the measurement precision by using magnetic field detection instead of optical encoder mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical/optical encoder system with a magnetic field-based detection system using a Hall element. This substitution eliminates the need for complex mechanical structures and light paths, reducing device complexity while maintaining rotational angle detection capability through magnetic field sensing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If an encoder is used to detect rotational angle, then measurement precision is improved, but the device size increases

Engineering Contradiction:

Improverotational angle detection precisionVSAvoiddetection device volume

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The patent extracts only the essential function of rotational angle detection from the encoder system, implementing it with a compact Hall element and minimal circuitry. This reduces the volume significantly while maintaining precision by focusing on the core detection mechanism rather than the entire encoder assembly.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the bulky mechanical/optical encoder with a compact magnetic sensing system. The Hall element and associated circuits occupy minimal space compared to an encoder, achieving the same measurement precision with dramatically reduced device volume.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Difficulty of detecting and measuring

If light detection is performed, then analytical capability is improved, but interference from encoder light source increases

Engineering Contradiction:

Improvelight emission detection capabilityVSAvoidlight interference from encoder

Core Design Contradiction:

Difficulty of detecting and measuringVSObject-affected harmful factors

Solution Approach 1:

The patent removes the encoder light source that causes interference, extracting only the essential rotational angle detection function. This eliminates the harmful light interference while preserving the ability to detect light emission from samples through magnetic field-based angle detection combined with optical detection.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the optical encoder system with a magnetic field-based detection system using a Hall element. This substitution eliminates the light source that causes interference with sample light detection, while maintaining rotational angle detection precision through magnetic sensing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enables precise detection of the rotational angle of the substrate, reducing the size and complexity of the sample analysis device while maintaining high accuracy, suitable for applications requiring precise light detection.

Implementation Method 1

a first Hall element and a second Hall element arranged in a positional relationship of an angle α (0° < α ≤ 180°) with each other around the rotor

Methodology Applied

Scientific EffectHall effect: Hall Effect

Data Source

PatentUS10574160B2Circuit for detecting rotation angle, method for detecting rotation angle, sample analysis device, and computer program for sample analysis device

Publication Date: 2020.02.25 PHC HLDG CORP

AI summary

A brushless motor includes: a 2n-pole (n: natural number) rotor; and a first Hall element and a second Hall element arranged at a positional relationship of an angle α (0°<α<180°) from each other with respect to a rotation axis of the rotor. The first Hall element and the second Hall element each output a voltage signal in accordance with a magnitude of a magnetic field of the rotor. A rotational angle detection circuit for detecting a rotational angle of the brushless motor includes: a phase detection circuit that receives the voltage signals from the first Hall element and the second Hall element and that detects a phase of the rotor by using values of the voltage signals and information of the angle α; and an angle calculation circuit that calculates a rotational angle of the rotor calculated from an initial angle based on the phase and a predetermined reference angle.