Brushless Motor Controller Integration for Friction Reduction

Solution Overview

Problem

Conventional PMDC motors experience friction, noise, and reduced service life due to brush engagement, while BLDC motors require external controllers, increasing installation complexity and cost.

Innovation Solution

A brushless direct current (BLDC) motor assembly with a controller positioned within the motor housing, featuring a stator, rotor subassembly, and cooling structures like fans and heat sinks, allowing for fully assembled motor integration and reduced friction through magnetic field interaction without brushes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If brushes are used in PMDC motors to physically engage the commutator, then the motor can be simpler in structure, but friction increases leading to noise, wear, and reduced service life

Engineering Contradiction:

Improvemotor structureVSAvoidservice life

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent replaces the mechanical brush-commutator engagement system with a brushless direct current (BLDC) motor system that uses electronic commutation. The controller manages power delivery to stator windings to create rotating magnetic fields that drive the rotor, eliminating physical brush contact and thereby reducing friction, noise, and wear while extending service life.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a controller as an intermediary component between the power source and the motor windings. This controller electronically manages the commutation process, replacing the mechanical commutator and brushes with electronic switching of power phases, thereby eliminating the harmful mechanical contact while maintaining motor functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If brushes are used in PMDC motors, then the motor structure can be simpler, but operating noise increases due to friction

Engineering Contradiction:

Improvemotor structureVSAvoidoperating noise

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the mechanical brush-commutator engagement system with a brushless direct current (BLDC) motor system that uses electronic commutation. The controller manages power delivery to stator windings to create rotating magnetic fields that drive the rotor, eliminating physical brush contact and thereby reducing friction, noise, and wear while extending service life.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If brushes are used in PMDC motors, then the motor can operate, but operating temperatures increase limiting service life

Engineering Contradiction:

Improveoperational capabilityVSAvoidoperating temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent replaces the mechanical brush-commutator engagement system with a brushless direct current (BLDC) motor system that uses electronic commutation. The controller manages power delivery to stator windings to create rotating magnetic fields that drive the rotor, eliminating physical brush contact and thereby reducing friction, noise, and wear while extending service life.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Reliability

If external controllers are used with BLDC motors, then friction and noise are reduced, but installation complexity and cost increase

Engineering Contradiction:

Improveservice lifeVSAvoidinstallation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the controller and motor into a single integrated assembly. The controller is positioned within the motor housing, with cooling structures like fans and heat sinks integrated into the same assembly. This integration simplifies installation by treating the motor-controller combination as a single unit while maintaining the benefits of brushless operation.

Inventive Principle:

Principle #5Merging (Combining)

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 solution reduces friction and noise, extends motor service life, and simplifies installation by integrating the controller within the motor housing, enhancing operational efficiency and reducing costs.

Implementation Method 1

A brushless direct current (BLDC) motor assembly with a controller positioned within the motor housing, featuring a stator, rotor subassembly

Methodology Applied

Scientific EffectMagnetic field interaction: Electromagnetic Induction

Data Source

PatentEP3631953B1Self-contained brushless motor and brushless controller

Publication Date: 2021.07.21 YUYAO ACTUATOR ELECTRIC MOTOR CO LTD

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AI summary

A brushless direct current electric motor assembly includes a housing having a first end and a second end and a stator disposed in the housing. The assembly further includes a rotor subassembly disposed in the stator, the rotor subassembly having a shaft having a first end proximate the first end of the housing and a second end proximate the second end of the housing. The assembly further includes a controller disposed in the housing, the controller configured to control rotation of the shaft. The first end of the shaft is configured to provide a rotational output.