External Rotor Motors

External rotor motors put the spinning rotor outside the stator and couple it directly to the impeller — shorter axially, no transmission losses, and self-cooled by the airstream. Articles cover the construction, direct-drive vs belt-drive comparisons and typical axial and centrifugal applications.

External rotor motor with the impeller mounted directly on the rotor
By longwell / August 21, 2026 / Fan Engineering Guides

External Rotor vs Internal Rotor Motor Fans

In an external rotor motor the outside spins and the impeller mounts s...

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AC vs EC fan variants of a cross-flow platform built for one order
By longwell / August 10, 2026 / Engineering Case Studies

We Proposed All-EC. The Customer Was Right to Refuse.

Consolidating on one motor platform would have simplified our producti...

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-strong-1--Rediscovering--External-Roto
By longwell / April 7, 2026 / Technical Articles

Rediscovering “External Rotor”: An Underestimated Fan Revolution

In-Depth Analysis of External Rotor Axial Flow Fans Structural Princip...

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By longwell / May 9, 2025 / Product

Longwell Centrifugal Fans | Brushless External Rotor Powerhouse for Extreme Environments

Forged through decades of industrial fan expertise, Longwell’s n...

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