Stepping Motor Yoke Locking for Compact Multi-Coil Assembly
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Solution Overview
Problem
Existing stepping motors face challenges in efficiently and compactly integrating multiple coils while maintaining stable electrical connections and preventing coil detachment, which affects their performance and mounting efficiency in devices like timepieces.
Innovation Solution
A triple-coil stepping motor design featuring a stator with projection parts and yokes locked by supporters, with catch parts preventing yoke detachment and ensuring stable coil integration, allowing for compact and efficient assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple coils are integrated in the stepping motor, then the functionality and performance are improved, but the device complexity and mounting difficulty increase
Solution Approach 1:
The stator is divided into multiple independent yokes, each carrying one or more coils. Each yoke can be assembled separately and then locked to the stator core using supporters with catch parts. This segmentation allows for modular assembly, reducing the overall mounting complexity while maintaining multiple coil integration.
Solution Approach 2:
Supporters act as intermediary components between the yokes and the stator core. The supporters include catch parts that engage with grooves on the yokes, providing a simple locking mechanism that secures multiple coils without requiring complex fastening systems.
2Reliability
If coils are securely fixed to prevent detachment, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The supporters are designed with catch parts that automatically engage with grooves formed on the yokes during assembly. This self-locking mechanism secures the coils without requiring additional fasteners or complex fixation structures, maintaining reliability while minimizing added complexity.
Solution Approach 2:
Instead of using external fasteners to secure the coils, the design inverts the approach by forming grooves directly on the yokes that receive the catch parts of the supporters. This integrated groove design simplifies the fixation structure while ensuring reliable coil attachment.
3Volume of moving object
If the motor is designed for compact mounting, then the volume is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
By dividing the stator into separate yokes that can be assembled modularly, the design achieves compact overall dimensions while allowing each yoke to be manufactured and prepared independently. This reduces the cumulative tolerance stack-up that would occur in a monolithic structure, thereby managing manufacturing precision requirements.
Solution Approach 2:
The grooves are pre-formed on the yokes during yoke manufacturing, and the catch parts are pre-configured on the supporters. This preliminary preparation of mating features ensures precise alignment during final assembly, enabling compact motor design without excessively tight assembly tolerances.
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 design ensures stable electrical connections and prevents coil detachment, enabling compact mounting and increased package density in devices, enhancing performance and efficiency.
Implementation Method 1
multiple coils magnetically coupled to the stator
Implementation Method 2
a rotor magnetized in a radial direction
Data Source
AI summary
A stepping motor includes: a rotor magnetized in a radial direction; a stator; two yokes; and coils magnetically coupled to the stator. The stator includes a straight part, first and second projection parts, and a rotor receiver formed in the second projection part. The first and second projection parts are formed at both ends of the straight part in a longitudinal direction of the straight part and project in directions crossing the longitudinal direction. The two yokes are disposed along the longitudinal direction at both ends of the straight part. One end of each yoke is locked to the first projection part via a first supporter, and another end thereof is locked to the second projection part via a second supporter. A catch part is formed at one end of each yoke so as to go around the first supporter from a yoke side toward a straight part side.