Electric motor

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Solution Overview

Problem

Existing electric motor designs face a challenge in reducing vibration propagation from the motor stator to the casing while maintaining the magnetic path contributing to rotational torque.

Innovation Solution

The electric motor incorporates a stator core configuration with annular inner and outer yoke portions joined by beam portions, which are fixed to each other using various fixing methods, reducing vibration propagation and deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If axial grooves are provided in the yoke portion to reduce vibration, then vibration is reduced, but the magnetic path contributing to rotational torque decreases

Engineering Contradiction:

ImprovevibrationVSAvoidmagnetic path

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The yoke portion is segmented into multiple core members stacked in the axial direction, with beam portions extending between inner and outer yoke portions. This segmentation allows vibration isolation between layers while maintaining the magnetic path through the beam portions and joint portions, resolving the contradiction between vibration reduction and magnetic path preservation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The core members are nested in the axial direction with beam portions connecting inner and outer yoke portions. The fixing portions are embedded within the beam portions to join core members, creating a nested structure that reduces vibration propagation while maintaining structural integrity and magnetic path continuity.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Stability of the object's composition

If core members are fixed to each other to reduce deformation, then deformation is reduced, but manufacturing complexity increases

Engineering Contradiction:

ImprovedeformationVSAvoidmanufacturing complexity

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The fixing portions are merged with the beam portions, where the fixing portions are provided within the beam portions to join core members. This integration reduces the number of separate components and simplifies manufacturing while effectively reducing deformation through the fixing mechanism.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The fixing portions are strategically positioned at specific locations within the beam portions where deformation occurs most. This localized fixing approach provides effective deformation reduction only where needed, simplifying manufacturing compared to universal fixing while maintaining structural stability.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP4462645B1Electric motor

Publication Date: 2026.03.25 DAIKIN INDUSTRIES LTD

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AI summary

An electric motor (30) includes a rotor (40) rotatable about a rotary shaft and a stator core (32) disposed outside the rotor (40) and having a plurality of core members (37) stacked in an axial direction. The core members (37) each include an annular inner yoke portion (41), a tooth portion (35), an annular outer yoke portion (43), a plurality of beam portions (42) extending in a circumferential direction between the inner yoke portion (41) and the outer yoke portion (43), an inner joint portion (44) joining the inner yoke portion (41) and the beam portions (42) in a radial direction, and an outer joint portion (45) joining the outer yoke portion (43) and the beam portions (42) in the radial direction. The electric motor (30) includes at least one fixing portion (51a to 59b) fixing the core members (37) to each other.