Motor Control Unit for Stable Rotation Under Variable Load
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Solution Overview
Problem
Existing electromechanical devices face instability in rotating motors due to varying loads, leading to either failure to move objects under high loads or vibration under low loads, as they cannot adjust driving signals effectively to accommodate different load conditions.
Innovation Solution
The solution involves adjusting the driving signal's potential difference based on the stay period of the rotary shaft's load, gradually increasing it for high loads and maintaining it within predetermined limits to prevent overcurrent and vibration, while ensuring stable rotation across a wide range of loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the driving voltage of the motor is increased to move objects under large load, then the motor can overcome the load, but the object may vibrate due to excessive voltage
Solution Approach 1:
The patent applies dynamics by making the driving voltage variable rather than fixed. The motor control unit dynamically adjusts the driving voltage based on the stay period duration, which reflects the load magnitude. For large loads (long stay period), higher voltage is applied to generate sufficient torque. For small loads (short stay period), lower voltage is applied to prevent vibration. This dynamic adjustment resolves the contradiction between needing high force and maintaining stability.
Solution Approach 2:
The patent changes the voltage parameter adaptively based on load conditions. The control system monitors the stay period (which indicates load magnitude) and accordingly modifies the driving voltage parameter. This parameter change allows the motor to operate at optimal voltage levels for different load scenarios, achieving both high torque when needed and vibration prevention when load is light.
2Stability of the object's composition
If the driving voltage of the motor is decreased to prevent vibration, then the object stability is improved, but the motor cannot move objects under large load
Solution Approach 1:
The system dynamically adjusts voltage based on real-time load detection through stay period measurement. When light load is detected (short stay period), low voltage is applied to ensure stability. When heavy load is detected (long stay period), high voltage is applied to provide sufficient torque. This dynamic response resolves the contradiction by adapting voltage to actual operational needs.
Solution Approach 2:
The patent implements feedback control where the stay period duration serves as feedback about the load magnitude. The control unit uses this feedback information to adjust the driving voltage appropriately. This closed-loop control mechanism ensures that voltage is optimized for each specific load condition, resolving the contradiction between stability and torque availability.
3Device complexity
If a fixed driving voltage is applied to the motor, then the control system is simple, but the motor cannot stably rotate across a wide range of loads
Solution Approach 1:
The patent changes the driving voltage parameter based on detected load conditions (stay period). This parameter adaptation enables the motor to maintain stable rotation across varying loads. The control logic, while adding some complexity, uses straightforward comparisons and voltage adjustments that achieve reliable performance without excessive system complexity.
Solution Approach 2:
The patent creates a universal control mechanism that handles multiple load scenarios (light, medium, heavy loads) with a single adaptive system. The same control unit and voltage adjustment mechanism work across the entire load range, providing multi-functional capability that ensures reliable motor operation regardless of load 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 approach allows for stable motor rotation across a wide range of loads, preventing vibration and ensuring accurate movement of components like vehicle transmission knobs, by dynamically adjusting the driving signal's potential difference in response to changing load conditions.
Implementation Method 1
an electromechanical device including a motor (130) mounted therein, a rotation sensor (134) that detects an angular position of a rotary shaft (132) of the motor (130), and a motor control unit (191) that controls the rotary shaft (132) based on an angle range of the rotary shaft (132) detected by the rotation sensor (134) and a change in the angle range
Data Source
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AI summary
There are provided an electromechanical device capable of stably rotating a motor corresponding to a wide range of load applied to the motor, a control method of an electromechanical device, and a control program of an electromechanical device. An electromechanical device (100) includes: a motor (130) including a rotary shaft (132); a rotation sensor (134) that detects in which of a plurality of angle ranges the angular position of the rotary shaft (132) is present; and a motor control unit (191) that controls the rotation of the rotary shaft (132) by transmitting a driving signal to the motor (130) based on the angle range of the rotary shaft (132) detected by the rotation sensor (134). The motor control unit (191) changes the driving signal in a stay period according to the length of the stay period until the rotary shaft (132) exits from one angle range after the rotary shaft (132) enters the one angle range.