A quadrangular fan motor with a thickness of 3 mm or less and a side length of 20 mm. We do our best in all aspects of design, analysis, and manufacturing to challenge the limits of size.
In today's market where ultra-thin laptops are still popular, the high-frequency technology of CPUs has also developed dramatically with the high refinement of computer displays and the improvement of video decoding capabilities. Fan motors used in laptops must meet stringent technical requirements, both to ensure sufficient airflow to cool the CPU in hot operation, and to meet the market's requirements for ultra-thin bodies. At present, although fan motors with a thickness of 3.5mm to 4mm have become cooling fans for ultra-thin notebook computers, in order to respond to the new market demand for computer body thickness, Japan Dec has begun to try to develop fan motor products with a thickness of less than 3mm. Technically, it is not impossible to make a thinner fan motor, but the ideal size is a fan motor with a thickness of less than 3 mm based on the simulation test of the location space of the fan motor and the calculation of the optimal ratio of the space volume at the air inlet to the volume of the fan body.
At present, with the development trend of ultra-thin notebook computers, fan motors with a thickness of only 4mm or even 3.5mm have also been introduced. The ultra-thin computer body has greatly increased the technical requirements for the mechanical structure and air fluid design of the fan motor, so we have made full use of fluid analysis technology to draw the optimal fan motor structure
In order to meet the requirements of both the ultra-thin body and the large airflow required for high-frequency CPU cooling, we decided to increase the number of fan blades in addition to the existing fan motor with a thickness of about 10 mm for 13 blades and a single blade thickness. In addition, for laptops, how to reduce the noise emitted when the fan rotates is also one of the technical difficulties. In general, the noise emitted when the fan rotates is mainly an overtone based on the product of the number of fan blades and the rotational speed. Considering that the frequency of overtones is too high and prone to noise, we decided to reselect the number of fan blades to avoid the formation of high-frequency noise. At the same time, we also decided to use a non-evenly spaced blade design to further improve the noise reduction effect. In order to find a balance between noise reduction and sufficient airflow as quickly as possible, we used our own coupling analysis technology to comprehensively analyze the air inlet, fan, flow path, and airflow and noise up to the CPU to be cooled, and formulated an optimal structural design.
In order to reduce the thickness of the blades while ensuring sufficient air volume and reducing the maximum noise emitted when the fan rotates, we decided to adopt a design scheme that increases the number of blades and non-evenly spaced blades, and uses our own coupling analysis technology to find the optimal balance between air volume and noise in the shortest possible time
One of the strengths of Japan Densan is that it is able to mass-produce ultra-small resin fans, which are difficult to mold, according to the designed shapes, as they design and manufacture molds for blades, and that the company has the injection molding technology in the company. In addition, with the trend of ultra-thinning, the design and manufacturing of fans has become more difficult, and in fact, the same is true for motors. Especially in magnetic circuits, the thinner the design of the core part and the thinner the winding part, the more difficult it is. The wire diameter of the winding wire is 0.1mm or less. In the case of rough winding, the number of rotations cannot be obtained and the torque cannot be secured, so the winding machine needs to be controlled very precisely. Since the Group maintains the development technology of winding machines, it is possible to develop a new winding model or improve an existing model to meet the required specifications in a short period of time.
Instructions from R&D personnel
Currently, we are also taking on the challenge of developing technology for thinner and smaller fan motors. More and more users are also choosing some of the high-spec models in laptops to complete ultra-high loads (or CPU loads) such as video editing, and such high-spec models are often equipped with high-frequency CPUs. Of course, the latest models must be ultra-thin. And the market needs a thin and high-volume fan motor that can withstand harsh external conditions. Japan Denco holds the world's leading capital of hydraulic bearings established by HDD motors, and has established cutting-edge technologies such as coupling analysis. In the future, we will make full use of these technologies to strive for a leading position in the field of fan motors.
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