Motor Drive Cover Baffle Prevents Air Recirculation

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Solution Overview

Problem

Existing motor drive enclosures, such as NEMA 3R cabinets, are expensive and require additional space due to their larger size, and they can obstruct air flow necessary for cooling, especially when used outdoors or in harsh environments, leading to reduced thermal performance and potential damage from rain and dust.

Innovation Solution

A partial cover for motor drives is designed with air inlets and outlets that allow airflow while preventing rain ingress, featuring a baffle to prevent air recirculation and a rain restrictor to direct air away from the cover, reducing material and size requirements while maintaining cooling efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a full enclosure cabinet (NEMA 3R) is used to protect the motor drive from rain and dust, then protection from harsh environments is improved, but cost and size increase significantly

Engineering Contradiction:

Improveprotection from rain and dustVSAvoidcabinet size

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The patent applies segmentation by providing a partial cover that only covers specific portions of the motor drive rather than enclosing the entire unit. The cover includes a first opening for the air inlet and a second opening for the air outlet, protecting only the vulnerable front areas while leaving the rear exposed for cooling airflow.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by providing differential protection - the cover protects the front of the drive where the air inlet is located, but leaves the rear portion uncovered to allow air outlet access. This localized approach provides protection where needed while maintaining cooling performance.

Inventive Principle:

Principle #3Local quality

2Reliability

If a full enclosure cabinet is used to protect the motor drive, then protection from rain and dust is improved, but cost increases

Engineering Contradiction:

Improveprotection from rain and dustVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies this principle by using a simple, inexpensive partial cover structure rather than a complex, expensive full NEMA 3R cabinet. The cover is a cost-effective solution that provides necessary protection without the high cost of complete environmental enclosures.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Temperature

If the air inlet and air outlet are exposed to allow cooling airflow, then thermal performance is improved, but protection from rain and dust deteriorates

Engineering Contradiction:

Improvecooling efficiencyVSAvoidexposure to rain and dust

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies this principle by introducing a baffle as an intermediary element between the air outlet and the cover interior. The baffle prevents direct airflow from the air outlet to the air inlet, eliminating the harmful recirculation effect while maintaining the cooling function.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Temperature

If a partial cover with openings is used to maintain cooling airflow, then thermal performance is improved, but protection from rain and dust deteriorates

Engineering Contradiction:

Improvecooling efficiencyVSAvoidprotection from rain and dust

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Inventive Principle:

Principle #3Local quality

5Temperature

If the cover is made larger to provide sufficient air flow openings, then cooling efficiency is improved, but size and material requirements increase

Engineering Contradiction:

Improvecooling efficiencyVSAvoidcover size

Core Design Contradiction:

TemperatureVSVolume of stationary object

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies this principle by using a baffle that extends into the three-dimensional space of the cover interior. The baffle creates a spatial separation that prevents air recirculation without requiring the cover itself to be larger, thus maintaining compact dimensions while achieving the cooling function.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 partial cover effectively protects the motor drive from rain and dust while maintaining airflow and heat dissipation, reducing costs and size without compromising thermal performance, and addresses the issue of air recirculation, thus enhancing the drive's operational reliability in harsh conditions.

Implementation Method 1

a separator (such as a baffle) inside the cover that is dimensioned and positioned such that, in use, air is prevented from flowing inside the cover from the air outlet to the air inlet

Methodology Applied

Scientific EffectAir flow separation:

Implementation Method 2

the rain restrictor and/or the separator may be shaped to direct at least some air from the air outlet away from the cover

Methodology Applied

Scientific EffectRain restriction:

Data Source

PatentEP3028370B1Motor drive cover

Publication Date: 2021.09.08 DANFOSS POWER ELECTRONICS AS

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AI summary

A cover for a motor drive is provided. The cover includes an opening (often at the bottom of the cover) to allow air to pass to an air inlet of the motor drive and an opening (often near the top of the cover) to allow air from an air outlet of the motor drive to exit the cover. A hood provides rain protection for the drive and a separator (such as a baffle) within the enclosure prevents air flowing within the enclosure from the air outlet to the air inlet of the drive. The hood and/or the separator are shaped to direct air from the air outlet away from the enclosure in order to substantially reduce the re-circulation of air from the air outlet to the air inlet of the drive.