Electric Tool Motor Control for Variable Load and Voltage
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Solution Overview
Problem
Existing electric tools with motor control systems based on direct-current power supplies face inefficiencies due to constant target rotation settings, which do not account for varying load magnitudes and voltage levels during motor operation, leading to suboptimal performance.
Innovation Solution
A motor control device that dynamically updates the command value for motor speed based on parameters such as voltage and load magnitude during rotation, using vector control and adaptive methods to optimize motor efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the target rotation number is set based on power supply voltage while the motor is stopped, then the motor speed can be adjusted for different voltage conditions, but the motor operation efficiency cannot be improved during rotation when load and voltage vary
Solution Approach 1:
The patent applies dynamics by transitioning from static target rotation number setting (performed while motor is stopped) to dynamic command value updating (performed during motor rotation). The control device continuously updates the command value based on real-time detection of power supply voltage and load magnitude, allowing the motor to adapt to changing operating conditions during rotation rather than maintaining a fixed preset speed.
Solution Approach 2:
The patent implements feedback by detecting the actual operating conditions (power supply voltage and load magnitude) during motor rotation and using this information to update the command value. The control device creates a closed-loop system where the motor's actual performance feeds back into the control decision, enabling continuous optimization of motor efficiency based on real-time conditions rather than relying on pre-set values.
2Device complexity
If the target rotation number is fixed, then the control system is simple, but the motor cannot adapt to varying load and voltage conditions during rotation
Solution Approach 1:
The patent applies self-service by enabling the motor control system to automatically adjust its own operating parameters without external intervention. The control device autonomously detects voltage and load conditions, processes this information, and updates the command value independently, allowing the system to self-regulate and adapt to changing conditions without requiring complex external control mechanisms.
3Stability of the object's composition
If the motor rotates at constant speed, then the operation is stable, but the operation efficiency remains low when load or voltage varies
Solution Approach 1:
The patent applies parameter changes by dynamically modifying the command value (a key control parameter) based on detected variations in power supply voltage and load magnitude. Instead of maintaining a constant speed, the system adjusts the command value to optimize motor efficiency under different operating conditions, transforming the motor's operational parameters in real-time to balance stability and efficiency.
Data Source
AI summary
An electric tool includes a motor and a motor control device. The motor control device is configured to update a command value of a speed of the motor based on a parameter relating to at least one of a voltage of a direct-current power supply for the motor or a magnitude of a load applied to the motor during rotation of the motor.