Vibrating Motor Pole Shoe Nesting for Compact Stator Design

Solution Overview

Problem

Current vibrating motors in mobile communication devices face challenges with large space occupation and complex welding processes, particularly when thick pole shoes are involved, leading to weak bonding strength and inefficiencies.

Innovation Solution

The vibrating motor design includes a stator with an iron core and coil, where pole shoes have a recessed avoiding portion to reduce thickness and allow for easier fixing within the housing, eliminating the need for complex welding by using positioning posts and allowing external welding, thus improving stability and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the pole shoes are made thick to ensure sufficient bonding area, then the bonding strength between pole shoes and iron core is improved, but the space occupied by the stator increases and the welding process becomes more difficult

Engineering Contradiction:

Improvebonding strength between pole shoes and iron coreVSAvoidspace occupied by stator

Core Design Contradiction:

StrengthVSVolume of stationary object

Solution Approach 1:

The pole shoes are nested within the stator assembly with positioning posts that fit into corresponding cavities in the iron core, allowing the pole shoes to be securely held in place without requiring thick construction or complex welding processes. The positioning posts extend through the pole shoes and are welded to the iron core, creating a strong mechanical connection while maintaining compact dimensions.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Strength

If the pole shoes are made thick to ensure sufficient bonding area, then the bonding strength between pole shoes and iron core is improved, but the welding process becomes more complicated and energy-consuming

Engineering Contradiction:

Improvebonding strength between pole shoes and iron coreVSAvoidwelding process complexity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The connection between pole shoes and iron core is segmented into two parts: mechanical connection via positioning posts that fit into cavities, and thermal connection via welding of the positioning posts to the iron core. This segmentation allows for simplified manufacturing where thin pole shoes can be easily positioned and securely attached without requiring extensive welding of the pole shoes themselves.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The positioning posts serve as an intermediary element between the pole shoes and the iron core. These posts are welded to the iron core and provide both mechanical support and thermal conduction, eliminating the need for direct welding between thick pole shoes and the iron core, thereby simplifying the welding process.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If the pole shoes are made thick to ensure sufficient bonding area, then the bonding strength between pole shoes and iron core is improved, but the welding energy required increases

Engineering Contradiction:

Improvebonding strength between pole shoes and iron coreVSAvoidwelding energy

Core Design Contradiction:

StrengthVSUse of energy by stationary object

Solution Approach 1:

The connection between pole shoes and iron core is segmented into two parts: mechanical connection via positioning posts that fit into cavities, and thermal connection via welding of the positioning posts to the iron core. This segmentation allows for simplified manufacturing where thin pole shoes can be easily positioned and securely attached without requiring extensive welding of the pole shoes themselves.

Inventive Principle:

Principle #1Segmentation

4Strength

If the stator is designed with traditional structure, then the bonding strength between pole shoes and iron core can be sufficient, but the device complexity increases

Engineering Contradiction:

Improvebonding strength between pole shoes and iron coreVSAvoidstator structure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The pole shoes are nested within the stator assembly with positioning posts that fit into corresponding cavities in the iron core, allowing the pole shoes to be securely held in place without requiring thick construction or complex welding processes. The positioning posts extend through the pole shoes and are welded to the iron core, creating a strong mechanical connection while maintaining compact dimensions.

Inventive Principle:

Principle #7Nested doll (Nesting)

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

This configuration reduces space occupation, simplifies the welding process, enhances bonding strength, and improves the overall stability and efficiency of the vibrating motor.

Implementation Method 1

The vibrator includes magnetic steels which surround the coil

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS11264882B2Vibrating motor

Publication Date: 2022.03.01 AAC ACOUSTIC TECH (SHENZHEN) CO LTD

AI summary

The present application discloses a vibrating motor, which includes a housing having a receiving cavity, a stator received in the receiving cavity, a vibrator received in the receiving cavity, and a flexible assembly received in the receiving cavity. The flexible assembly is configured for elastically supporting the vibrator. The housing includes a top wall, a bottom wall facing the top wall, and a side wall connecting the top wall and the bottom wall. The stator includes an iron core, a coil sleeved on the iron core, and pole shoes positioned at two ends of the iron core. Each the pole shoe has a surface close to the iron core recessed to form an avoiding portion, and the iron core is inserted in the avoiding portion.