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Fan Basics

Session 12 - Technology for High Durability

Depending on the application and performance of the equipment, the fan may be installed in unusual environments. SANYO DENKI offers fans with high environmental durability to match the environment in which your equipment will be used. In this session, we will introduce our technology used to enhance the durability of fans.
SANYO DENKI offers roughly four types of durability: long life, water/oil protection, wide temperature range, and G-force resistance.

Keys to longer service life

The "life" of the long-life fan is the expected life learned in the third session. Most of SANYO DENKI's standard fans have an expected life of 40,000 hours at an ambient temperature of 60℃, but most of the long-life fans we have developed in recent years have an expected life of over 100,000 hours.
As seen in the third session, the "grease life" of the bearing is the biggest factor affecting the expected life of fans. Therefore, we have devised measures to extend the grease life: reduction of the bearing temperature and bearing load.

▲Fig. 1 Aluminum frame / Resin frame
▲Fig. 1

For example, as shown in Fig. 1, replacing a plastic (resin) frame with an aluminum frame that has a higher heat dissipation, the temperature rise of the bearing can be suppressed, thus the bearing temperature can be reduced.

▲Fig. 1 Aluminum frame / Resin frame
▲Fig. 1

Keys to water and oil protection

Standard fans can fail if they are exposed to water, adversely affecting the electrical parts inside, but our Splash Proof and Oil Proof Fans can be used in environments where they are exposed to water or oil. There are two major differences between these water/oil-resistant fans and standard fans.

1. The motor and circuit board, which are electrical parts, are coated with resin to prevent water and oil from entering. (See Figure 2)
2. The gap between the blades and the frame is widened to prevent the blades from locking due to oil buildup. (See Figure 3)

▲Fig. 2  Regular fan without protection / Resin coating for water and oil protection

▲Fig. 2

▲Fig. 3  Regular fan with narrow clearance / Oil Proof Fan with widened clearance

▲Fig. 3

Keys to a wider temperature range

Most standard fans fail or malfunction if used in environments with temperatures above or below the rated operating temperature range (-20°C to +70°C). By enhancing the temperature resistance of fans, they can operate even in harsh ambient temperatures. SANYO DENKI's Wide Temperature Range Fans can be used in a wide range of temperature environments, ranging from -40°C to +85°C. SANYO DENKI achieves a wide operating temperature range by designing such a structure and circuitry that allow heat/cold-vulnerable components to work normally even in extreme temperatures.

Keys to high G-force resistance

The "G" comes from the acceleration of gravity. Fans installed in equipment such as CT scanners are subjected to high levels of G-force. Standard fans cannot withstand the high G-forces in such equipment, and in the worst case scenario, the fan may disintegrate inside the equipment. G Proof Fans that we lately developed are designed to withstand high levels of G-force by using a highly durable aluminum frame, molding its impeller and rotor as one unit, and increasing the bonding strength of part joints.

As you can see, there are special environments in the world that cannot be handled by standard fans. SANYO DENKI achieves high durability of fans with various techniques that has developed over long years. Durable fans eliminate the need to prepare protection on the equipment, contributing to the downsizing of equipment and expanding the range of operating environments. Please consult SANYO DENKI if you have any problems using fans in unusual environments.

Date of publication: March 8, 2021

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