DC Brush Motor Driving Apparatus Deterioration Detection
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Solution Overview
Problem
Existing driving apparatuses for DC brush motors lack effective methods to detect motor deterioration, making it difficult for users to determine when a motor has aged and become abnormal, which affects convenience and performance.
Innovation Solution
A driving apparatus with a control circuit that gradually lowers the upper limit of motor current after startup and detects when the motor current is limited, using a combination of voltage and current detecting circuits to determine the motor's state and detect deterioration by comparing with baseline data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional driving apparatuses are used for DC brush motors, then the motor can operate, but the ability to detect motor deterioration is insufficient
Solution Approach 1:
The control circuit continuously monitors motor current and compares it against stored baseline data to detect deterioration. This feedback mechanism enables automatic detection of motor aging by identifying deviations from normal current patterns, resolving the contradiction between improved detection capability and device complexity
Solution Approach 2:
The system uses the motor's own operational characteristics (current consumption patterns) to detect its own deterioration state. By analyzing changes in current behavior over time, the motor system performs self-diagnosis without requiring external testing equipment, improving detection capability while maintaining simple apparatus structure
2Reliability
If the upper limit of motor current is gradually lowered after startup, then motor deterioration can be detected, but the control complexity increases
Solution Approach 1:
Baseline current data is stored in advance during normal motor operation. This preliminary data serves as a reference for future deterioration detection, allowing the system to accurately identify changes in motor characteristics without requiring complex real-time analysis algorithms
Solution Approach 2:
The control circuit dynamically adjusts the current limit based on detected deterioration state. By making the current limit adaptive rather than fixed, the system achieves accurate deterioration detection while using relatively simple control logic that responds to changing motor conditions
3Reliability
If motor current and rotation speed are monitored to detect deterioration, then timely notification can be provided, but energy consumption increases
Solution Approach 1:
The control circuit continuously monitors motor current during normal operation without requiring separate testing cycles. This continuous monitoring leverages the motor's operational current data to detect deterioration trends over time, providing timely notifications while minimizing additional energy consumption beyond normal motor operation
Solution Approach 2:
The control circuit acts as an intermediary that analyzes motor current patterns to infer deterioration state. Rather than requiring direct physical inspection or additional sensors, the system uses electrical current characteristics as a mediator to detect motor aging, reducing energy consumption while maintaining reliable detection capability
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 method allows for easy detection of motor deterioration by monitoring changes in motor current and rotation speed, enabling timely notification to users and reducing power consumption by identifying and addressing motor issues promptly.
Implementation Method 1
a drive circuit that supplies motor current to a coil of a DC brush motor
Data Source
AI summary
According to an embodiment, a driving apparatus of a DC brush motor includes: a drive circuit that supplies motor current to a coil of a DC brush motor; and a control circuit configured to: after a predetermined time interval has elapsed since starting-up of the DC brush motor, drop down step-by-step a limit value that sets an upper limit of the motor current; and detect turning into a state where the motor current is limited by the limit value.