Voltage Conversion Circuit for Consistent Motor Speed Control
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Solution Overview
Problem
Electric lawn mowers with adjustable motor rotation speed face issues when using batteries of different outputs, as they fail to maintain desired rotation speeds and disrupt weight balance, affecting operability.
Innovation Solution
An electric operating machine with a voltage conversion part that adjusts output voltage based on measured voltage, allowing for consistent motor speed control regardless of battery output, and includes features like overcurrent protection and battery abnormality detection to ensure safe and balanced operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a battery of different output is mounted to change the power source, then the power output can be adjusted, but the motor does not rotate at the desired rotation speed and the weight balance is changed
Solution Approach 1:
The voltage conversion part changes the voltage parameter from the battery to a standardized output voltage, allowing the motor to rotate at the desired speed regardless of the battery's original output. This parameter transformation resolves the contradiction by decoupling the battery output selection from the motor rotation speed control.
2Power
If a battery of different output is mounted, then the power source can be varied, but the weight balance of the electric lawn mower is changed
Solution Approach 1:
The voltage conversion part acts as an intermediary between the battery and the motor, standardizing the voltage output regardless of the battery's original specifications. This intermediary component allows different batteries to be mounted without affecting the overall system balance, as the conversion circuit compensates for variations in battery characteristics.
3Ease of operation
If voltage conversion is implemented to control motor speed, then motor rotation speed can be maintained, but the device complexity increases
Solution Approach 1:
The voltage conversion part is designed to handle multiple battery types and outputs universally, providing a standardized output for the motor. This multi-functional component simplifies the overall system by allowing the use of different batteries without requiring separate control circuits for each battery type, thus reducing the actual complexity increase.
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
Enables consistent motor speed control and improved weight balance, enhancing the operability of electric lawn mowers by accommodating batteries of varying outputs and ensuring safe operation.
Implementation Method 1
a voltage conversion part converting and outputting the voltage input from the battery
Implementation Method 2
a voltage measuring part measuring the voltage applied to the electric motor and outputting it to the voltage conversion part
Data Source
AI summary
When a main switch (12) is turned ON, an electric operating machine (1) is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.