Stepping Motor Control Circuit for Intermediate Stopping Detection
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Solution Overview
Problem
Conventional stepping motor control methods fail to accurately detect intermediate stopping states, leading to inaccurate pulse control and potential rotor misalignment in analog electronic timepieces.
Innovation Solution
A stepping motor control circuit that includes a rotation detecting unit to determine if an induction signal exceeds a reference threshold voltage in multiple sections, with the ability to invert signal polarity for detection, and a control unit to perform drive control using main drive pulses or correction pulses based on the detected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the energy of the main drive pulse is made small to lower consumption current, then power consumption is reduced, but the rotor may stop at an intermediate position (intermediate stopping) where it is not rotated by 180°, leading to inaccurate rotation state detection
Solution Approach 1:
The detection section is divided into multiple sections (first detection section, second detection section, third detection section) with different timing and polarity detection strategies. This segmentation allows the system to detect induction signals under different conditions, enabling accurate detection of intermediate stopping states while maintaining low power consumption drive pulses.
Solution Approach 2:
The invention detects induction signals with inverted polarity in the second detection section. By detecting the negative peak of the induction signal instead of only the positive peak, the system can identify intermediate stopping states that would be missed by conventional single-polarity detection, thereby improving detection accuracy without increasing drive pulse energy.
2Device complexity
If conventional detection methods are used to detect intermediate stopping, then the system structure remains simple, but the detection accuracy is poor because induction signals are not generated in intermediate stopping states
Solution Approach 1:
The invention dynamically adjusts the detection strategy by dividing the detection section into multiple sections with different detection modes. The system actively searches for induction signals with inverted polarity in specific time windows, enabling dynamic adaptation to intermediate stopping conditions without adding complex hardware structures.
Solution Approach 2:
The invention performs preliminary detection in the first detection section to determine whether an induction signal is generated. Based on this preliminary result, the system then performs inverted polarity detection in the second detection section, enabling accurate intermediate stopping detection through a two-stage detection process that maintains structural simplicity.
3Reliability
If the main drive pulse energy is increased to prevent intermediate stopping, then rotation reliability is improved, but power consumption increases
Solution Approach 1:
The invention uses feedback from induction signal detection to determine the actual rotation state of the rotor. By detecting whether the rotor has reached the target position (180° rotation) or stopped at an intermediate position, the system can verify rotation completion and adjust subsequent drive pulses accordingly, ensuring reliable rotation without continuously using high-energy pulses.
Solution Approach 2:
The invention changes the detection parameters (detection timing, polarity, and threshold) rather than changing the drive pulse energy. By adjusting detection parameters to identify intermediate stopping states, the system can maintain low drive pulse energy while ensuring reliable rotation through accurate state monitoring and correction when needed.
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 solution enables more accurate detection of rotation states, including intermediate stopping, preventing rotor misalignment and ensuring reliable hand movement in analog electronic timepieces with reduced power consumption.
Implementation Method 1
an induction signal which is generated due to the rotation of a rotor of a stepping motor
Data Source
AI summary
A stepping motor control circuit and an analog electronic timepiece which can detect a rotation state including intermediate stopping more accurately are provided. A rotation detection circuit, in detecting whether or not an induction signal generated by the rotation of a stepping motor exceeds a predetermined reference threshold voltage during a detection period having a plurality of sections, detects whether or not the induction signal with inverted polarity exceeds a predetermined reference threshold voltage during a predetermined section, and a control unit immediately performs a drive control of the stepping motor with a correction drive pulse when it is determined that there is a sign of intermediate stopping of the stepping motor based on a result of detection by the rotation detection circuit.