Electro-dynamic Shaker Field Current Optimization
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Solution Overview
Problem
Conventional electro-dynamic shaker systems face challenges in optimizing operating conditions for energy-saving and quiet operation, as they require professional knowledge to balance field and drive currents, leading to inefficient power consumption and heat management.
Innovation Solution
An apparatus with a vibration controller, variable field current power supply, and temperature sensors calculates optimal operating conditions by determining necessary excitation forces, drive currents, and coil temperatures to minimize power consumption and noise, while ensuring temperature constraints are met, allowing for gradual adjustments to maintain consistent vibration testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the field current is reduced to save power, then the field coil power consumption decreases, but the drive current must be increased to maintain excitation force, which increases drive coil power consumption and may exceed amplifier ratings
Solution Approach 1:
The system dynamically adjusts the field current parameter based on the required excitation force level. By changing this parameter in real-time rather than keeping it fixed, the system can operate at lower field currents when full force is not needed, thereby reducing field coil power consumption while the control system compensates to maintain adequate excitation force within amplifier capabilities.
Solution Approach 2:
The system uses feedback from the vibration controller and amplifier to monitor the actual excitation force and drive current levels. This feedback loop allows the system to detect when reducing field current would compromise performance and automatically adjusts the field current setting to maintain the optimal balance between power savings and maintaining sufficient drive current within amplifier ratings.
2Use of energy by moving object
If the field current is reduced to save power, then the field coil power consumption decreases, but the total power consumption may increase due to increased drive current requirements
Solution Approach 1:
The system dynamically optimizes the field current parameter based on real-time operating conditions and required excitation force levels. By continuously adjusting this parameter to the optimal value rather than using a fixed conservative setting, the system minimizes the sum of field coil and drive coil power consumption, ensuring that total power consumption is reduced without compromising performance.
Solution Approach 2:
The system automatically determines and adjusts its own operating parameters (field current and blower rotation) based on monitoring the required excitation force. This self-service capability eliminates the need for operator intervention and ensures the system continuously operates at the point of minimum total power consumption for the given testing requirements.
3Object-generated harmful factors
If the blower rotation is reduced to decrease noise, then the cooling capability decreases, but the coil temperatures may exceed limitations
Solution Approach 1:
The system dynamically adjusts the blower rotation parameter based on the actual thermal load of the coils, which depends on the field and drive current levels. By changing this parameter in real-time rather than maintaining a fixed high rotation, the system can reduce blower noise during low-power operation while ensuring adequate cooling when high currents generate more heat.
Solution Approach 2:
The system uses temperature monitoring and power consumption data as feedback to continuously adjust the blower rotation. This feedback loop allows the system to reduce blower speed and noise when coil temperatures are low (during power-saving operation) and automatically increase blower rotation when temperatures approach limitations, maintaining the optimal balance between noise reduction and thermal management.
4Loss of energy
If the field current and blower rotation are dynamically adjusted for optimization, then power consumption and noise are reduced, but the system complexity increases
Solution Approach 1:
The system integrates multiple functions into the existing vibration controller and field power supply units. The vibration controller performs both vibration control and excitation force monitoring, while the field power supply handles both field current control and communication with the optimization system. This multi-functionality approach avoids adding separate dedicated control systems, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The system implements a feedback-based optimization loop that uses existing sensors and controllers to monitor excitation force requirements and automatically adjust field current and blower rotation. By leveraging existing system components and their communication capabilities rather than adding entirely new control hardware, the system achieves dynamic optimization with minimal increase in complexity.
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 solution enables the determination of optimized operating conditions that reduce total power consumption and noise, while maintaining consistent vibration testing, thus addressing the inefficiencies and heat management issues in conventional systems.
Implementation Method 1
When DC current is fed to the field coil 4, a static magnetic field is generated at the gap 12
Implementation Method 2
AC current fed to the drive coil 10 yields a vibratory movement of the armature 6
Implementation Method 3
The armature 6 is supported by the air suspension 8 so that it can move along the centre line of the shaker
Implementation Method 4
With rotating the blower 16, air-flow from the air-intake 18 at the top of the magnetic circuit 2 to inside is generated, and this air-flow cools the field coil 4 and the drive coil 10
Data Source
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AI summary
Focusing on the criterion of "Energy save" or "Quiet noise" or other suitable operating parameter and considering the existing limitation of the operation of the electro-dynamic shaker system, apparatus for optimizing the operating condition of the vibration test system is proposed. The apparatus 100 measures the field current and drive current under the state that the desired vibration is fed to the specimen 20, and calculates the necessary force the shaker 1 should supply. Field current is supposed to be varied, and the necessary drive current is calculated based on the necessary force data. Further, the blower rotation is supposed to be varied, and the total power consumption at the coils and the blower is calculated. Also the temperatures of the field coil 4 and of the drive coil 10 is estimated and checked whether within the limitation. Then the optimal operating condition for the focused criterion is selected.