Step Motor Coil Connector Relocation for Compact Assembly
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Solution Overview
Problem
Existing step motors face challenges in precision position control and assembly due to protruding coil connection terminals, which increase installation space and hinder assemblability and extendability.
Innovation Solution
A step motor design that incorporates a rotary sensing unit within the casing to enhance reliability and features coil connection terminals formed on the stator bobbin within the casing, along with a coil-removal-preventing member to secure the coil, reducing motor volume and improving assembly compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coil connection terminals protrude perpendicularly from the shaft, then electrical connection is achieved, but installation space increases and assemblability deteriorates
Solution Approach 1:
The coil connection terminals are extracted from the protruding position on the shaft and relocated to the bobbin structure. This extraction removes the harmful protrusion effect while maintaining the electrical connection function, allowing terminals to be positioned within the casing boundaries.
Solution Approach 2:
The coil connection terminals are repositioned from a radial protrusion (perpendicular to shaft) to a position on the bobbin outer surface. This dimensional relocation allows electrical connections to be made from the side rather than from the end, reducing the overall installation footprint.
2Reliability
If coil connection terminals protrude perpendicularly from the shaft, then electrical connection is achieved, but assemblability with counterpart deteriorates
Solution Approach 1:
The protruding coil connection terminals are extracted and relocated to the bobbin structure, removing the obstacle to assemblability while preserving electrical connection capability. This allows the motor to be assembled with counterpart components without interference from protruding terminals.
3Reliability
If rotary sensing unit is added to detect rotor rotation, then reliability and feedback control are improved, but device complexity increases
Solution Approach 1:
The rotary sensing unit is merged with the existing motor structure, utilizing the casing and rotor assembly. The sensing unit integrates with the rotor shaft and stator components, adding feedback functionality without requiring a completely separate sensing system.
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 increases motor reliability by accommodating a rotary sensing unit for feedback signal output, reduces motor volume through internal coil connection terminals, and enhances assemblability and extendability by securing the coil, addressing the issues of protruding terminals and installation space.
Implementation Method 1
rotated by interaction with the stator
Implementation Method 2
detect a rotation of the rotor
Data Source
AI summary
Disclosed herein is a step motor. The step motor includes a casing, a stator disposed in the casing, with a coil being wound around the stator, a rotor disposed in the stator, having a rotor shaft that is rotatably supported at both ends of the casing, and rotated by interaction with the stator, a rotary sensing unit provided in the casing to detect a rotation of the rotor, and a coil connector formed on an outer surface of the stator, with an end of the coil being connected to the coil connector.