Deflecting Speed Sensor Members for Voltage Regulation

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Solution Overview

Problem

Magnetic speed sensor systems face challenges in providing accurate rotational speed measurements in high-speed and thermally dynamic environments, often resulting in compromised speed information due to excessive voltage outputs.

Innovation Solution

A speed sensor system comprising a magnetic sensor and a cylindrical drum with axially extending members that deflect radially outward as rotational speed increases, regulating voltage outputs by increasing air gaps between the sensor and the members, thereby preventing excessive voltage generation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the air gap between the magnetic sensor and axially extending members is reduced to improve measurement precision, then speed measurement accuracy improves, but excessive voltage outputs occur at high rotational speeds

Engineering Contradiction:

Improvespeed measurement accuracyVSAvoidexcessive voltage output

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The air gap between the magnetic sensor and axially extending members is made dynamic rather than fixed. The axially extending members are positioned to naturally deflect outward under centrifugal force at high rotational speeds, automatically increasing the air gap when needed to regulate voltage output while maintaining a smaller gap at low speeds for precise measurements

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the physical parameter of the air gap dynamically based on rotational speed. By allowing the axially extending members to deflect, the air gap parameter automatically adjusts from a smaller value (for precision) to a larger value (for voltage regulation) as rotational speed increases

Inventive Principle:

Principle #35Parameter changes

2Object-generated harmful factors

If the air gap is increased to reduce voltage output, then excessive voltage is prevented, but measurement precision deteriorates

Engineering Contradiction:

Improvevoltage output regulationVSAvoidspeed measurement accuracy

Core Design Contradiction:

Object-generated harmful factorsVSMeasurement precision

Solution Approach 1:

The air gap is made dynamic through the deflectable axially extending members that respond to rotational speed. The members remain close to the sensor at low speeds for precision but automatically move outward at high speeds to regulate voltage, eliminating the need for a permanently large air gap

Inventive Principle:

Principle #15Dynamics

3Device complexity

If a fixed air gap structure is used to simplify device complexity, then manufacturing is easier, but the system cannot accommodate axial displacement or regulate voltage at high speeds

Engineering Contradiction:

Improvesensor structure simplicityVSAvoidaccommodation of axial displacement

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The axially extending members serve themselves by using centrifugal force from the rotating drum to automatically deflect outward and increase the air gap at high speeds. This self-regulating mechanism accommodates axial displacement and regulates voltage without requiring external control systems or complex adjustment mechanisms

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The structure transitions from a fixed air gap to a dynamic one where the axially extending members can move radially outward. This dynamic configuration provides adaptability for axial displacement while maintaining structural simplicity

Inventive Principle:

Principle #15Dynamics

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 system effectively regulates peak-to-peak voltage outputs within a safe operational range, maintaining accurate rotational speed measurements even at elevated speeds and accommodating axial displacement without compromising performance.

Implementation Method 1

The magnetic sensor is configured to generate an electrical output that indicates each passage of each of the axially extending members around the magnetic sensor

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Implementation Method 2

The axially extending members are adapted to deflect radially outwards away from the magnetic sensor in response to an increased rotational speed of the cylindrical drum

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS10365292B2Speed sensing system

Publication Date: 2019.07.30 ROLLS ROYCE CORP

AI summary

A speed sensor system for measuring rotational speed includes a magnetic sensor and a cylindrical drum rotatable around the magnetic sensor. The cylindrical drum includes several axially extending members disposed circumferentially around a first edge of the cylindrical drum. The magnetic sensor is configured to generate an electrical output that indicates each passage of each of the axially extending members around the magnetic sensor as the cylindrical drum rotates around the magnetic sensor. The axially extending members are adapted to deflect radially outwards away from the magnetic sensor in response to an increased rotational speed of the cylindrical drum. The deflection of the axially extending members provides voltage regulation functionality that maintains voltage outputs of the magnetic sensor within a desired operational range.