Motor Current Feedback Control for Lower Power Consumption
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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, as they often require increased voltage or current to maintain performance, leading to inefficiencies.
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. This device adjusts the voltage applied to the motor based on the difference between the target and actual current values, decreasing voltage when the actual current exceeds the target and increasing it when the 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 conversion speed is maintained, 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 system that continuously adjusts voltage based on real-time current feedback. The control unit dynamically modifies the voltage applied to the motor according to the difference between target and actual current values, enabling the system to adapt to varying load conditions and reduce power consumption while maintaining required performance.
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 information, compares it with target current values, and modifies the voltage accordingly - decreasing voltage when actual current exceeds target and increasing voltage when actual current falls below target. This closed-loop feedback mechanism eliminates the need for excessive power input while maintaining conversion speed.
2Ease of operation
If constant voltage control is used to simplify control, then control is simplified, but current consumption remains high
Solution Approach 1:
The patent replaces simple open-loop constant voltage control with a closed-loop feedback control system. The control unit continuously monitors actual current consumption and adjusts the applied voltage based on the difference between target and actual current values. This feedback mechanism maintains control simplicity from the operator's perspective while automatically optimizing current consumption through real-time adjustments.
Solution Approach 2:
The patent applies parameter changes by dynamically modifying the voltage parameter based on current consumption conditions. Instead of maintaining a fixed voltage, the system adjusts the voltage level according to the actual current flowing through the motor, thereby optimizing energy efficiency while maintaining ease of operation through automated parameter adjustment.
3Speed
If voltage is increased to maintain conversion speed under high load, then conversion speed is maintained, but power consumption increases
Solution Approach 1:
The patent uses feedback control to precisely adjust voltage only to the extent necessary to maintain conversion speed. By continuously monitoring actual current and comparing it with target current, the control unit applies the minimum necessary voltage increase to maintain speed under high load conditions, rather than applying excessive voltage that would increase power consumption unnecessarily.
Solution Approach 2:
The patent applies partial action by providing only the necessary amount of voltage increase required to maintain conversion speed under high load, rather than applying excessive voltage. The control unit calculates the precise voltage adjustment needed based on current differences, ensuring that power consumption is minimized while still achieving the required speed maintenance.
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
The proposed solution effectively reduces power consumption by dynamically adjusting the voltage applied to the motor, thereby optimizing energy use and maintaining performance without increasing current consumption.
Implementation Method 1
a motor control device that controls a motor that drives an electric device
Data Source
AI summary
A motor control device that controls a motor M that drives an electric device, the motor control device includes a target current information acquisition unit that acquires target current information indicating a target current value of a current for energizing the motor, an actual current information acquisition unit that acquires actual current information indicating an actual current value of a current actually flowing through the motor, and a voltage value setting unit that sets a voltage value of a voltage to be applied to the motor, wherein the voltage value setting unit 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.