Stepping Motor Reference Position Detection via Load Fluctuation
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Solution Overview
Problem
Existing timepiece technologies face difficulties in determining the reference position of an indicating hand, especially when there is insufficient load for outputting an auxiliary drive pulse, leading to increased power consumption and inefficient operation.
Innovation Solution
A timepiece movement with a stepping motor and control unit that uses main and auxiliary drive pulses to determine the reference position of the indicating hand by detecting rotation states through induced voltage during specific detection periods, adjusting energy levels based on load fluctuations to optimize detection and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an auxiliary drive pulse is used to detect the reference position, then the reference position can be identified, but power consumption increases
Solution Approach 1:
The system uses the load fluctuation that naturally occurs during normal operation of the indicating hand to detect the reference position. The load unit attached to the indicating hand creates a characteristic load pattern when the hand passes through the reference position, eliminating the need for separate auxiliary drive pulses and reducing power consumption.
Solution Approach 2:
The system detects changes in load parameters during normal operation to identify the reference position. By monitoring load fluctuations rather than using fixed auxiliary pulses, the system adapts to varying operational conditions while maintaining detection accuracy and minimizing energy usage.
2Measurement precision
If a detection method using auxiliary drive pulse is used, then reference position can be determined, but it fails when insufficient load is available
Solution Approach 1:
The indicating hand's own operation generates the load fluctuations needed for detection. The load unit attached to the hand creates detectable load patterns during normal operation, making the detection system self-sufficient and reliable across varying load conditions without requiring separate auxiliary drive mechanisms.
Solution Approach 2:
The system dynamically adapts to varying load conditions by continuously monitoring load fluctuations during operation. Rather than relying on fixed auxiliary pulses, the system responds to the dynamic load patterns naturally generated by the indicating hand's movement, ensuring reliable detection across different operational scenarios.
3Measurement precision
If multiple detection periods are used to determine reference position, then detection accuracy improves, but operation time increases
Solution Approach 1:
The system uses periodic monitoring of load fluctuations during normal operation to detect the reference position. By leveraging the natural periodic motion of the indicating hand and the corresponding load patterns, the system achieves accurate detection without requiring extended detection periods or additional operational time.
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
Enables accurate determination of the reference position using a predetermined load, reducing power consumption and ensuring normal hand operation while minimizing energy wastage.
Implementation Method 1
the control unit detects the rotation state of the rotor by detecting an induced voltage during at least one period in a detection period
Data Source
AI summary
A timepiece movement includes a stepping motor having a rotor for rotating an indicating hand, and a control unit for rotating the rotor by using a main drive pulse and an auxiliary drive pulse. When the indicating hand is rotated using a detection drive pulse based on the main drive pulse, the control unit determines a reference position of the indicating hand by detecting a rotation state of the rotor.