Brushless Motor Closure Cap Recess for Electronic Board

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Solution Overview

Problem

Existing brushless motors face challenges in achieving compactness while maintaining easy access to the electronic control board for repair or replacement, as current solutions either increase axial space or complicate encoder synchronization.

Innovation Solution

A brushless motor design featuring a closure cap with a recessed area for the electronic control board and a terminal strip that can be easily assembled without threaded joining elements, allowing for axial or radial cable routing depending on space requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of repair

If the electronic control board is arranged outside the cap in a protective hood extended externally, then the encoder is easily accessible for adjustment and replacement, but the axial space occupation increases significantly

Engineering Contradiction:

Improveaccessibility of electronic control boardVSAvoidaxial space occupation

Core Design Contradiction:

Ease of repairVSLength of stationary object

Solution Approach 1:

The electronic control board is nested within a recess in the closure cap, allowing the board to be contained within the existing cap structure rather than extending externally. This nesting approach provides protection while maintaining compact axial dimensions.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

Instead of extending the electronic board assembly in the axial direction (one dimension), the invention utilizes the radial depth of the closure cap by creating a recess. This dimensional transition allows the board to be accessible while reducing axial projection.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Length of stationary object

If the encoder is arranged inside the cap fixed to an annular portion, then the motor becomes more compact axially, but the encoder cannot be accessed without disassembling the cap

Engineering Contradiction:

Improveaxial space occupationVSAvoidaccessibility of electronic control board

Core Design Contradiction:

Length of stationary objectVSEase of repair

Solution Approach 1:

The closure cap is segmented into an outer protective portion and an inner recessed portion that houses the electronic board. This segmentation allows the board to be accessible through an opening in the cap structure without requiring complete cap disassembly, while maintaining axial compactness.

Inventive Principle:

Principle #1Segmentation

3Volume of stationary object

If the closure cap is designed to be compact, then the overall motor size is reduced, but the electronic board becomes difficult to access for maintenance

Engineering Contradiction:

Improvemotor sizeVSAvoidaccessibility of electronic control board

Core Design Contradiction:

Volume of stationary objectVSEase of repair

Solution Approach 1:

The closure cap features a localized recess with an opening specifically designed for electronic board access. This local modification provides maintenance accessibility without compromising the overall compactness of the cap and motor assembly.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2961046B1Electronically commutated motor with end caps and power connection

Publication Date: 2022.09.07 AMER SPA

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AI summary

A brushless motor (10), comprising a casing (11) for containing a stator body and for a rotor with a driving shaft (12), an exit cap (13) with an outlet for the driving shaft (12) and a closure cap (14), which is positioned on the opposite side of the exit cap (13), which supports an electronic board (15) for the brushless motor controlling and which comprises an output for power cables. The closure cap (14) has a recess (16) for containing the electronic control board (15), which is formed so as to be offset from the outer surface (17) of the cap (14) in an axial direction.