Stator Slit Routing for Outer Rotor Motor Lead Wire Protection
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Solution Overview
Problem
In outer rotor claw-pole stepping motors, the lead wires from the stator coils often come into contact with the rotor, leading to potential mechanical issues and reduced reliability due to their external routing.
Innovation Solution
The stator design incorporates a cylindrical shaft with radially inward slits to house the lead wires, preventing them from detouring around the annular portions and thus minimizing the risk of contact with the rotor, while also improving assembly and wiring workability through notch portions that guide the wires into the slits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lead wire is provided outside the stator, then the wiring is simple and easy to access, but the lead wire may come into contact with the rotor causing mechanical issues and reduced reliability
Solution Approach 1:
The lead wire is nested inside the stator structure by routing it through a groove formed on the stator core and securing it with a retaining member. This nesting approach prevents the lead wire from contacting the rotor while maintaining organized wiring within the confined stator space.
Solution Approach 2:
A retaining member acts as an intermediary component to secure the lead wire within the groove on the stator core. This mediator ensures the lead wire remains properly positioned and prevented from protruding or contacting the rotor, solving the reliability issue without requiring complex external routing.
2Ease of manufacture
If the lead wire is routed externally, then assembly and wiring workability is improved, but the lead wire detours around annular portions increasing risk of contact with rotor
Solution Approach 1:
The stator core is segmented to include a dedicated groove structure that divides the space for lead wire routing. This segmentation creates a defined pathway that guides the lead wire away from the rotor area, eliminating the need for detours around annular portions while maintaining ease of assembly.
3Reliability
If the lead wire is kept inside the stator using slits and retaining members, then contact with rotor is prevented improving reliability, but the structure becomes more complex
Solution Approach 1:
The groove and retaining member are integrated as a combined structural feature of the stator core. This merging of functions allows the lead wire to be secured within the stator using a unified structure that prevents rotor contact while minimizing the addition of separate complex components.
Data Source
AI summary
A stator includes a cylindrical shaft extending in an axial direction, annular portions positioned side by side in the axial direction radially outside the shaft and extending in a radial direction, pole teeth extending in the axial direction from a radially outer end portion of each of the annular portions, and one or more coils between the annular portions adjacent to each other in the axial direction and wound around the shaft. The shaft includes at least one slit recessed radially inward from an outer peripheral surface of the shaft and extending along the axial direction. A portion of the at least one slit is radially inside the annular portion. A lead wire of the coil is accommodated in the at least one slit.