Motor Current Feedback Control for Lower Power and Stable Speed
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Solution Overview
Problem
Existing motor control systems for electric devices, such as valve timing control in internal combustion engines, face challenges in reducing power consumption while maintaining efficient operation.
Innovation Solution
A motor control device that includes a target current information acquisition unit, an actual current information acquisition unit, and a voltage value setting unit. The voltage value setting unit adjusts the voltage applied to the motor based on the difference between the target and actual current values, reducing power consumption by lowering voltage when actual current exceeds the target and increasing voltage when actual current falls below the target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If constant conversion speed control is used to maintain motor performance, then the motor can achieve required conversion speed, but power consumption increases when voltage or power is increased
Solution Approach 1:
The patent applies dynamics by transitioning from fixed control modes (constant conversion speed or constant voltage) to a dynamic control strategy where voltage is continuously adjusted based on real-time current feedback. The control unit dynamically modifies voltage output to match actual motor needs, ensuring conversion speed requirements are met while minimizing power consumption through adaptive voltage regulation rather than fixed high-voltage application
Solution Approach 2:
The patent implements feedback control by measuring the actual current flowing through the motor and using this information to adjust the applied voltage. The control unit receives current feedback, compares it with target current values, and dynamically adjusts voltage to maintain optimal operation. This closed-loop feedback mechanism enables the system to reduce power consumption while preserving required conversion speed by avoiding unnecessary high voltage application
2Ease of operation
If constant voltage control is used to simplify control, then the control system is easier to implement, but consumption current flows continuously reducing power efficiency
Solution Approach 1:
The patent maintains control simplicity while improving power efficiency by implementing feedback-based voltage adjustment. The control unit continuously monitors actual current and automatically adjusts voltage accordingly, eliminating the need for complex manual control strategies. This automated feedback mechanism keeps the control system simple to operate while significantly reducing continuous consumption current compared to constant voltage control
Solution Approach 2:
The patent applies parameter changes by dynamically modifying the voltage parameter based on actual current measurements. Instead of maintaining a fixed voltage level, the system adjusts voltage as a variable parameter that responds to real-time motor conditions. This parameter change strategy simplifies control by automating the adjustment process while reducing power consumption through appropriate voltage levels matched to actual motor needs
3Use of energy by moving object
If motor energization is stopped when cam torque is positive to reduce power consumption, then power consumption decreases, but conversion speed may be insufficient when load decreases
Solution Approach 1:
The patent uses feedback control to monitor actual current and dynamically adjust voltage, ensuring the motor maintains sufficient conversion speed even when load decreases. The control unit receives continuous current feedback and adjusts voltage to match actual motor needs, preventing speed deficiency while minimizing power consumption by avoiding unnecessary high voltage application during low-load conditions
Solution Approach 2:
The patent applies dynamics by implementing dynamic voltage adjustment based on real-time current feedback rather than using fixed energization schedules. The control system dynamically modifies voltage output to match actual motor requirements, ensuring conversion speed is maintained when load decreases while reducing power consumption when load is high, creating an adaptive response to varying operational conditions
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 configuration effectively reduces power consumption when the motor load increases and prevents a decrease in motor rotation speed when the load decreases, thereby optimizing energy usage and performance.
Implementation Method 1
the voltage value setting unit decreases the voltage value when the actual current value exceeds the target current value, and increases the voltage value when the actual current value falls below the target current value
Data Source
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AI summary
A motor control device (1) that controls a motor M that drives an electric device, the motor control device (1) includes a target current information acquisition unit (10) that acquires target current information indicating a target current value of a current for energizing the motor M, an actual current information acquisition unit (11) that acquires actual current information indicating an actual current value of a current actually flowing through the motor M, and a voltage value setting unit (13) that sets a voltage value of a voltage to be applied to the motor M, wherein the voltage value setting unit (13) lowers the voltage value when the actual current value exceeds the target current value, and increases the voltage value when the actual current value falls below the target current value.