Stator Terminal Block Layout for Stable Bus Bar Mounting

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Solution Overview

Problem

Existing electric motors face issues with bus bar vibration and increased axial length due to the bus bar extending away from the stator, which can lead to structural instability and inefficiencies.

Innovation Solution

The bus bar is fixed to a terminal block along the side face of the stator core, with one end connected to the lead wire and the other end secured to the terminal block, preventing vibration and maintaining the axial length of the motor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the bus bar extends away from the stator core in the axial line direction, then the external connection terminal can be positioned away from the stator, but the bus bar readily vibrates and the axial length of the motor increases

Engineering Contradiction:

Improvepositioning of external connection terminalVSAvoidvibration resistance of bus bar

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The bus bar is configured to extend in the radial direction from the stator core instead of the axial direction, changing the dimension of extension. This allows the external connection terminal to be positioned away from the stator while the bus bar follows the side face of the stator core, preventing vibration and avoiding increase in axial length

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of operation

If the bus bar extends away from the stator core, then the external connection terminal is positioned further from the stator, but the axial length of the motor increases

Engineering Contradiction:

Improvepositioning of external connection terminalVSAvoidaxial length of motor

Core Design Contradiction:

Ease of operationVSLength of moving object

Solution Approach 1:

The bus bar extends in the radial direction rather than the axial direction, changing the dimension of extension. This positioning allows the external connection terminal to be accessible while the bus bar follows the side face of the stator core, preventing increase in the axial length of the motor

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of operation

If the bus bar is held by a bus bar holding portion with the external connection terminal further from the stator, then the terminal is accessible, but the portion of the bus bar beyond the holding portion readily vibrates

Engineering Contradiction:

Improveaccessibility of external connection terminalVSAvoidstructural stability of bus bar

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The bus bar extends in the radial direction from the stator core and follows the side face of the stator core, changing the dimension of extension. This configuration provides structural support along the entire length of the bus bar, preventing vibration while maintaining accessibility of the external connection terminal

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The terminal block serves as an intermediary structure that the bus bar follows and connects to. The terminal block is fixed to the stator core, providing support to the bus bar along its extension path, which prevents vibration while allowing the external connection terminal to be positioned away from the stator

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12542461B2Terminal block structure for stator of electric motor

Publication Date: 2026.02.03 TOYOTA JIDOSHA KK

AI summary

An electric motor disclosed herein includes a stator core, a coil wound around the stator core, a terminal block, and a bus bar. The terminal block is disposed so as to face a side face of the stator core. The bus bar is connected to a lead wire of the coil, and is also fixed to the terminal block. The bus bar extends along the side face of the stator core in an axial direction of the stator core, and one end portion thereof is fixed to the terminal block by a bolt.