Color Wheel Phase Detection via Three-Phase Motor Signals

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Solution Overview

Problem

Current color wheel phase detection methods in laser projection technology are prone to synchronization issues due to the use of black tape, leading to asynchronous rotation and blurred images, and are difficult to accurately align during production.

Innovation Solution

A color wheel phase detection system utilizing a three-phase motor and control circuit with a phase detection device that sends pulse signals based on voltage readings from the three-phase driving circuit to determine the preset starting position of the color wheel, ensuring accurate phase detection and synchronization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If black tape is used for color wheel phase detection, then the structure is simple and cost is low, but the reliability deteriorates due to tape falling off causing asynchronization

Engineering Contradiction:

Improvedetection structure complexityVSAvoidphase detection reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The invention extracts the detection function from the mechanical tape marker and relocates it to the electrical control system. The phase detection is performed by monitoring the three-phase motor's driving signals rather than using a physical marker, eliminating the reliability issue of tape falling off while maintaining system simplicity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces the mechanical tape marker system with an electrical signal-based detection system. By monitoring the electrical phases of the motor driving circuit, the system achieves phase detection without mechanical components, thereby improving reliability while keeping the overall system simple

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of manufacture

If black tape is used for color wheel phase detection, then the implementation is simple, but the manufacturing precision deteriorates due to difficulty in aligning tape position with color sections

Engineering Contradiction:

Improvedetection implementation easeVSAvoidtape alignment precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The invention replaces the mechanical alignment process of taping with an electrical synchronization approach. The phase detection is achieved by correlating the motor's electrical phase signals with the color wheel's rotational position, eliminating manual alignment requirements and ensuring precise synchronization without complex manufacturing procedures

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system uses feedback from the three-phase motor's driving circuit to automatically determine the color wheel's phase position. By monitoring the electrical signals and comparing them with reference phases, the system achieves precise synchronization without requiring manual alignment during manufacturing

Inventive Principle:

Principle #23Feedback

3Device complexity

If traditional photoelectric detection with black tape is used, then the detection method is simple, but the measurement precision deteriorates due to asynchronous rotation and blurred images

Engineering Contradiction:

Improvedetection system complexityVSAvoidphase detection precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The invention replaces the photoelectric detection method with an electrical signal-based detection method. By directly monitoring the three-phase motor's driving signals, the system achieves more precise phase detection that is not susceptible to the synchronization issues affecting optical detection methods

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system uses its own internal electrical signals from the motor driving circuit for phase detection, rather than relying on external optical markers. This self-service approach provides more reliable and precise phase information directly from the control system itself

Inventive Principle:

Principle #25Self-service

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

This solution provides reliable, accurate, and cost-effective phase detection, preventing asynchronous rotation and blurred images, and enhancing user experience by maintaining consistent image quality.

Implementation Method 1

the phase detection device sends a pulse signal to the control circuit when detecting a preset phase corresponding to a preset starting position of the color wheel

Methodology Applied

Scientific EffectVoltage detection: Electric Field

Data Source

PatentUS11781915B2Color wheel phase detection method and system, and projection device

Publication Date: 2023.10.10 APPOTRONICS CORP LTD

AI summary

A color wheel phase detection method and system, and a projection device. The phase detection system comprises a color wheel (1), a color wheel motor (2) that drives the color wheel (1) to rotate, and a control circuit (3); the color wheel motor (2) is a three-phase motor, and the control circuit (3) comprises a three-phase driving circuit (31) for driving the color wheel motor (2) to operate. The phase detection system further comprises a phase detection device (4) for detecting the three-phase driving circuit (31); when detecting a preset phase, the phase detection device (4) sends a pulse signal to the control circuit (3) to implement color wheel phase detection. Therefore, the effects of low costs, high accuracy, and high reliability are achieved.