Step Motor Terminal Spacing and Coaxial Bushing Design
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Solution Overview
Problem
Conventional PM step motors face difficulties in performing automatic winding operations due to spatial limitations imposed by the interval between connection terminals, making miniaturization challenging and complicating terminal block installation.
Innovation Solution
The design includes a stator unit with first and second stators that butt against each other, each with a bobbin and yoke, and a rotor unit with magnets on a rotating shaft, where terminal blocks are spaced apart to facilitate easy automatic winding, and a bushing with a through hole for coaxial arrangement of the stator, rotating shaft, and casing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the connection terminals are positioned close together to reduce the motor size, then the outer diameter is reduced, but automatic winding operations become very difficult
Solution Approach 1:
The terminal blocks are arranged in the axial direction (along the rotation axis) rather than radially, utilizing the third dimension to space terminals apart without increasing the motor's outer diameter. This allows automatic winding equipment to access terminals easily while maintaining compact radial dimensions.
2Volume of moving object
If the terminal block is installed with spatial constraints to minimize size, then the motor is more compact, but the installation becomes complicated
Solution Approach 1:
The terminal blocks are pre-integrated with the stator cores during assembly, positioning them in advance at optimal locations along the axial direction. This preliminary arrangement simplifies subsequent installation steps and eliminates complex spatial coordination during final assembly.
3Device complexity
If the stator, rotating shaft, and casing are assembled without a alignment aid, then the number of parts is reduced, but coaxial arrangement becomes difficult
Solution Approach 1:
The bushing serves as an intermediary component that provides a common reference axis for the stator, rotating shaft, and casing. By inserting the rotating shaft through the bushing's through-hole and positioning the bushing within the stator and casing, coaxial alignment is achieved without requiring complex adjustment procedures.
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 configuration allows for easy automatic winding operations and coaxial alignment, improving manufacturing efficiency and reducing the number of assembly processes, thereby enhancing productivity and quality while minimizing manufacturing costs.
Implementation Method 1
a bobbin receiving a coil that generates a magnetic force when external power is applied thereto
Data Source
AI summary
Disclosed herein is a PM type step motor used to move a camera or an optical pickup lens of media related equipment. The step motor has a stator unit including first and second stators which butt against and are coupled to each other and each have a bobbin and a yoke attached thereto. Terminal blocks of the first and second stators are spaced apart from each other when the first and second stators are coupled to each other, thus allowing an automatic winding operation using winding equipment to be easily performed. The step motor includes a bushing which has in a central portion thereof a through hole through which a rotating shaft passes and is a two-stage structure having a small outer diameter part and a large outer diameter part, thus allowing the stator unit, the rotating shaft and a casing unit to easily be arranged coaxially.