Motor Coil Lead Wire Insulation via Bearing Holder
Solution Overview
Problem
In motors, the connection of coil lead wires to control devices and bus bars often requires ensuring electrical insulation from peripheral members, which is challenging due to the complexity of existing configurations, leading to potential short-circuits and increased size.
Innovation Solution
A motor design featuring a rotor, stator, wire support member, and bearing holder with through-holes for coil lead wires, where the wire support member holds and connects the lead wires while the bearing holder provides insulation, reducing the risk of short-circuits and allowing for a more compact motor structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coil lead wires are drawn out from the stator to connect to control devices and bus bars, then electrical connection is achieved, but the risk of short-circuits increases due to insulation challenges with peripheral members
Solution Approach 1:
The patent introduces a bearing holder as an intermediary component that provides a through-hole for the coil lead wires to pass through. This bearing holder acts as a mediator between the stator and the external connection devices, ensuring proper insulation and positioning of the lead wires while maintaining electrical connection reliability without increasing overall structural complexity
2Reliability
If insulation structures are added to protect coil lead wires from peripheral members, then short-circuit risk is reduced, but the motor size increases
Solution Approach 1:
The bearing holder is designed to serve multiple functions simultaneously: it supports the bearing, provides insulation for the coil lead wires, and guides the wires through its through-hole. By making the bearing holder multi-functional, the patent prevents short-circuits without adding separate insulation components that would increase motor size
3Reliability
If coil lead wires are routed through insulation structures, then electrical insulation is ensured, but positioning accuracy of lead wires deteriorates
Solution Approach 1:
The bearing holder's through-hole serves as a precise guide for the coil lead wires, ensuring accurate positioning as they pass from the stator to the external connection devices. The intermediary structure maintains both insulation and positioning accuracy by providing a controlled pathway for the wires
Data Source
AI summary
A motor includes a rotor that has a shaft with a central axis extending in a vertical direction as a center, a stator disposed so as to face the rotor in a radial direction, a bearing that supports the shaft, a wire support member disposed above the stator, and a bearing holder disposed above the wire support member to hold the bearing. The stator includes a plurality of teeth, and a plurality of coils provided on the plurality of teeth. The wire support member includes a wire holding portion that holds one portion of coil lead wires among the coil lead wires drawn out from the coil, a conducting member that electrically connects the other portion of the coil lead wires to each other, and a main body portion that supports the wire holding portion and the conducting member.