Electric Motor Driver Regeneration Control
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Solution Overview
Problem
Existing electric transfer systems inefficiently regenerate charge current during non-driving periods, particularly at lower speeds, limiting battery charging efficiency.
Innovation Solution
An electric transfer system with a controller that manages transistors to store and charge regeneration current in coils during non-driving periods, using a motor driver with parallel-connected regeneration diodes and series-parallel transistor configurations to optimize charge storage and transfer based on speed data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motor is driven continuously to maintain motion, then the speed is maintained, but the battery is discharged continuously without regeneration charging
Solution Approach 1:
The controller periodically switches between motor driving mode and regenerative charging mode during non-driving periods. By turning on transistors connected to the negative pole of the battery during non-driving periods and storing regeneration charge current in coils, then turning off the transistors to charge the battery, the system creates periodic cycles of energy recovery that reduce overall battery discharge while maintaining operational speed requirements.
2Use of energy by moving object
If regenerative charging is performed during non-driving periods, then battery charging efficiency is improved, but the charge current is insufficient at lower speeds
Solution Approach 1:
The controller dynamically adjusts the turn-on time of transistors connected to the negative pole based on speed data from the speed sensor. At lower speeds where regenerative charge current is insufficient, the controller extends the turn-on duration to allow more current to be stored in the coils before charging the battery. This dynamic adjustment ensures effective regenerative charging across the full operating speed range.
Solution Approach 2:
During non-driving periods, the controller performs preliminary action by turning on transistors to store regeneration charge current in the motor coils before actually charging the battery. This preliminary storage phase allows the system to accumulate sufficient charge current even at lower speeds, ensuring that when the battery is charged, the charging efficiency is maximized regardless of the instantaneous speed.
3Power
If transistors are turned on longer to store more regeneration charge current, then the charge current increases, but the turn-on time increases
Solution Approach 1:
The controller dynamically adjusts the turn-on time of transistors based on real-time speed data. At higher speeds where more regeneration charge current is generated, the controller reduces the turn-on time. At lower speeds where less current is generated, the controller increases the turn-on time. This dynamic optimization ensures sufficient charge current is obtained without unnecessarily extending the transistor on-time across all operating conditions.
Solution Approach 2:
The speed sensor provides continuous feedback to the controller about the motor's operating speed. The controller uses this feedback to automatically adjust the transistor turn-on time, creating a closed-loop control system that optimizes the balance between obtaining sufficient regeneration charge current and minimizing the time transistors remain on. This feedback mechanism ensures efficient energy recovery without excessive time loss.
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 battery charging efficiency by automatically performing energy regeneration during non-driving periods across various speeds, improving charge current collection and storage for efficient battery charging.
Implementation Method 1
a motor connected to a wheel... configured to generate a regeneration charge current
Implementation Method 2
the controller controls to store the regeneration charge current in a coil included in the motor
Implementation Method 3
a chargeable/dischargeable battery... configured to drive the motor by discharging the battery
Data Source
AI summary
An electric transportation system is disclosed. In one aspect, the system includes a wheel, a rechargeable battery having positive and negative poles, and a motor mechanically connected to the wheel and configured to generate a regeneration charge current, the motor including a coil. The system also includes a motor driver connected to the motor and the battery. The motor driver is configured to discharge the battery during a supply period so as to drive the motor and charge the battery with the regeneration charge current, wherein the motor driver includes a plurality of transistors electrically connected to the negative pole during a non-driving period. The system further includes a controller connected to the motor driver and configured to control the motor driver so as to drive the motor during the supply period and control the motor driver so as to charge the battery during the non-driving period.