Motor Driving Control Apparatus Using Counter Electromotive Force
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Solution Overview
Problem
Electrically assisted bicycles require users to manually remove and charge the battery pack when it enters a power-saving state, causing inconvenience and lack of power supply to components like headlights when battery charge is depleted.
Innovation Solution
A motor driving control apparatus with a first controller for powering and regeneration, a second controller for managing the first, and an assistant circuit that activates the second controller using counter electromotive force when the bicycle is pedaled without the power switch being turned on, allowing automatic activation and charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the battery pack enters a power-saving state with automatic shut-down function, then energy consumption is reduced and battery performance deterioration is prevented, but the device complexity increases and manual intervention is required to exit the state
Solution Approach 1:
The system automatically detects when the battery enters a power-saving state and autonomously activates the control apparatus to exit the shut-down state, eliminating the need for manual user intervention. The assistant circuitry monitors battery status and automatically triggers the activation sequence using counter electromotive force from the motor.
Solution Approach 2:
The control apparatus is designed to preliminarily prepare the activation sequence by monitoring battery voltage levels and predicting when the battery will enter a power-saving state, allowing the system to automatically initiate the exit process before the user would need to manually intervene.
2Reliability
If the battery pack enters a power-saving state, then battery performance deterioration due to overdischarge is prevented, but the loss of time occurs when users need to manually charge the battery
Solution Approach 1:
The system automatically manages the battery's power-saving state transitions by detecting when the battery voltage drops to threshold levels and autonomously activating the control apparatus to initiate charging operations, eliminating the time users would spend manually connecting chargers and monitoring charging status.
3Ease of operation
If the assistant circuitry activates the second controller using counter electromotive force, then the ease of operation is improved by automatic activation, but the use of energy increases due to additional circuitry and activation operations
Solution Approach 1:
The system converts the counter electromotive force, which is normally a waste product generated during motor operation, into a useful energy source to power the assistant circuitry and activate the control apparatus. This approach eliminates the need for additional power consumption by repurposing energy that would otherwise be lost during motor rotation.
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
Enhances user usability by automatically activating the motor driving control apparatus and charging the battery, eliminating the need for manual intervention to exit the power-saving state and providing power to essential components like headlights.
Implementation Method 1
when a counter electromotive force caused by the motor, which is rotated without control by the first controller, satisfies a predetermined condition
Data Source
AI summary
A motor driving control apparatus in the embodiment includes: a first controller configured to control powering and regeneration of a motor; a second controller configured to control the first controller; and assistant circuitry configured to activate the second controller in a stop state, when a counter electromotive force caused by the motor, which is rotated without control by the first controller, satisfies a predetermined condition, before a power-on instruction for the motor driving control apparatus is made or in a state where the power-on instruction for the motor driving control apparatus is not made.