12-Tooth Stator Coil Layout for Shorter Axial Motor Length
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Solution Overview
Problem
Existing three-phase AC motors face instability due to unequal numbers of turns on teeth, leading to increased stator core length in the axial direction.
Innovation Solution
A stator design with 12 teeth, featuring a cylindrical part protruding in both axial directions, where A-phase coils have two fewer turns than B-phase and C-phase coils, and transition parts are arranged on opposite sides of the teeth, reducing the axial size and stabilizing motor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If transition parts of three coils are concentrated on one side of the stator core in the axial direction, then the motor structure is simplified, but the length of the stator core in the axial direction is increased
Solution Approach 1:
The transition parts of the three coils are segmented and distributed to opposite sides of the stator core in the axial direction. Specifically, transition parts of the U-phase and V-phase coils are disposed on one side, while transition parts of the W-phase coil are disposed on the other side, thereby reducing the axial length requirement
Solution Approach 2:
The coil windings are arranged to extend in the axial direction rather than only in the radial direction. The transition parts extend along the axial direction to connect teeth, utilizing the axial dimension to reduce the overall stator core length
2Length of moving object
If transition parts are distributed on opposite sides of the stator core, then the axial size is reduced, but the numbers of turns on teeth become different causing unstable motor driving
Solution Approach 1:
Different phases have different numbers of turns to compensate for the asymmetric distribution of transition parts. The U-phase and V-phase coils have different turn counts than the W-phase coil, creating local quality differences that balance the magnetic fields and ensure stable motor operation
Solution Approach 2:
The number of turns parameter is adjusted for each phase coil to compensate for the different positions of transition parts. By changing the turn counts, the magnetic field strength is balanced across all phases, ensuring stable motor driving despite the asymmetric axial distribution
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 reduces the stator core's axial size, stabilizes motor driving, and enhances service life while minimizing waste and defects, allowing for efficient operation.
Implementation Method 1
a stator (24) on which a stator core (240) and coils (243) are provided; a rotor (23) having an outer peripheral surface on which a plurality of permanent magnets (231) are disposed at equal intervals in a circumferential direction... the coils include: an A-phase coil... a B-phase coil... a C-phase coil... supplied with an A-phase current... supplied with a B-phase current... supplied with a C-phase current
Data Source
AI summary
A stator includes: an A-phase coil, wound around four of 12 teeth and supplied with an A-phase current; a B-phase coil, wound around another four of the 12 teeth and supplied with a B-phase current; a C-phase coil, wound around yet another four of the 12 teeth and supplied with a C-phase current. The A-phase coil includes a transition part extending along the cylindrical part on an axial side between the teeth spaced apart in the circumferential direction. The B-phase and C-phase coils each include a transition part extending along the cylindrical part on another axial side between the teeth spaced apart in the circumferential direction. The turns of the first A-phase coil are one turn fewer than the turns of the first B-phase coil and the turns of the first C-phase coil.