---
title: "Compared with the Core Technology of Permanent Magnet Fans, Rundongfang Industrial Fans Have Clear Advantages!"
url: https://tiercooling.com/posts/compared-with-the-core-technology-of-permanent-magnet-fans-rundongfang-industrial-fans-have-clear-advantages/
date: 2023-01-30
modified: 2026-09-28
lang: en
author: "info@tiercooling.com"
description: "For large factory workshops with high-space ventilation and cooling needs, the Rundongfang industrial fan is the choice. So what is the core technology of the Rundongfang permanent magnet industrial fan?..."
categories:
  - "News"
word_count: 305
---

# Compared with the Core Technology of Permanent Magnet Fans, Rundongfang Industrial Fans Have Clear Advantages!

For large factory workshops with high-space ventilation and cooling needs, the Rundongfang industrial fan is the choice. So what is the core technology of the Rundongfang permanent magnet industrial fan? Besides the permanent magnet motor, what other advantages does it have? The following is a detailed breakdown of these aspects.
1. Comparison of NdFeB magnet mounting methods between inner-rotor and outer-rotor permanent magnet motors
In outer-rotor motors, the NdFeB magnets are attached with adhesive. If the adhesive ages and fails, the magnets may fall off, causing the motor’s stator and rotor to jam. Once jammed, the motor is immediately scrapped, resulting in huge losses for the user.
In inner-rotor motors, the NdFeB magnets are embedded and fixed by structure, with no risk of adhesive aging or failure. The NdFeB magnets have no risk of falling off, which is why the warranty period for inner-rotor motors on the market is longer than that for outer-rotor motors.

2. Waterproof and dustproof comparison
3. Outer-rotor motor fan installation analysis
4. Inner-rotor motor fan installation analysis
5. Performance analysis of outer-rotor and inner-rotor motors

Outer-rotor motor: 1. The outer rotor generally uses a surface-mounted magnet structure, with an air-gap magnetic flux density of 0.6~0.8T, making it difficult to further improve the magnetic field; 2. The fan motor operates at low speed, and the motor windings are the main heat source. In outer-rotor motors, the windings are wrapped by the rotor, making heat dissipation difficult. The outer-rotor structure must use an open housing to enhance winding heat dissipation, greatly reducing the protection rating.
Inner-rotor motor: 1. The inner rotor uses a flux-concentrating structure, with an air-gap magnetic field of 1.0~1.4T, greatly improving the magnetic field; as a result, the motor volume is smaller than that of the outer-rotor motor; 2. The stator windings are located on the outside, directly connected to the housing, providing superior heat dissipation.