New Products Introduction “San Ace 40” Counter Rotating Fan Honami Oosawa Yoshihiko Aizawa Katsumichi Ishihara Toshiyuki Nakamura Takashi Kaise Seiji Nishimura 1. Introduction 3. Features Of The Product Recently, in electronic devices such as telecommunications- Fig.1 shows the “San Ace 40” counter rotating fan. related equipment, the heating value increases remarkably along with improved performance and miniaturization of built-in parts. As the result, miniaturization of devices is also rapidly advancing and an electronic device becomes highly heated as density is increased. In order to lower the heat, it is common to move air and heat. As heat increases, more air is necessary for cooling. Moreover, when the density of an electronic device increases as parts installed increases, the space where air flows inside of the case becomes small. To move and cool the air, a fan with high static pressure is needed. In order to realize large air volume and high static pressure, there is a method called the counter rotating method that differs from a general single axial fan as an airflow method. Performance is enhanced by mutually rotating two moving Fig.1 “San Ace 40” Counter Rotating Fan blades in the counter direction. This document introduces the outline of the fan motor “San The characteristics of this product are as follows: Ace 40” duplicate contra-rotating fan that adopts the duplicate contra-rotating method. (1) Large air volume, high static pressure (2) Low noise 2. Background Of The Development (3) Low power consumption (4) Best for 1U rack (height 44-45) There is a high demand for the 40 mm type fan for 1U server cooling applications. Many customers are requesting larger air The wing and the frame of the "San Ace 40" dual volumes and higher static pressures from these products. counter-rotating fan (hereafter, it is called the developed SANYO DENKI has previously developed and marketed a product) were newly designed and have achieved a large air product with top-class cooling capacity in the 40 mm sq. x 28 volume, high static pressure and a low noise. Moreover, the mm fan class. drive circuit was redesigned, and the power consumption was Two or more fans are sometimes needed when using 40 mm optimized. sq. x 28 mm thickness fans to cool a 1U server. Recently, one server manufacturer demanded a fan that has larger air volumes and higher static pressure to match the higher performance of their servers. However, achieving the air volume and the static pressure level that satisfies the customer’s requirements was difficult with the current class of 40 mm sq. by 28 mm thickness axial fan. As a manufacturer of fans, SANYO DENKI decided that the development of a fan that greatly exceeds the performance of the existing fans was urgently needed, considering high heats and high density in accordance with the further enhancement of 1U servers in the future (faster microprocessors, larger power supplies and larger capacity of hard disks). Thus the “San Ace 40” counter rotating fan of 40 mm sq. x 56 mm thickness was developed and SANYO DENKI applied the dual counter-rotating method which has been used for the ventilation of tunnels, and on aircraft, helicopters, ships, etc. 15|SANYO DENKI Technical Report No.16 Nov. 2003 Fig.2 Size Specifications of “San Ace 40” Counter Rotating Fan Table 1 General Characteristics of “San Ace 40” Counter Rotating Fan Operating Sound Rated Rated Rated Max. Static Voltage Rated Rotating Speed Max. Air Volume Pressure Voltage Current Input Pressure Model No. Range Level -1 min 3 V V A W m/min CFM Pa inchHO dB(A) 2 INLET FAN OUTLET FAN 9CR0412H501 0.72 8.64 13300 9300 0.59 20.8 320 1.28 54 12 10.8 13.2 9CR0412S501 1.1 13.2 15800 10600 0.7 24.7 450 1.8 57.5 4. Outline Of The Product Air Volume vs. Static Pressure （Measuved with SANYO Double Chamber） 4.1 Size Specifications 500 As for the appearance, this fan looks like two 40 mm sq. x 28 mm thickness fans attached together. Designed for 1U rack cabinet applications, the fan main body and lead lines are constructed so that they do not interfere with each other. 400 S Speed Fig.2 shows the size specifications of the developed product. 4.2 Characteristics 4.2.1 General Characteristics 300 12V operation was selected based on the requirements for 1U servers. Table 1 shows general characteristics of the developed 200 product. 4.2.2 Air Volume vs. Static Pressure H Speed Unlike the general characteristic of the air volume versus 100 static pressure of an axial flow fan, there is no depressed area of the static pressure in the central part of the characteristic curve. Fig.3 shows the air volume versus static pressure of the developed product. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 3 Air Volume [m /min] Fig.3 Air Volume vs. Static Pressure of “San Ace 40” Counter Rotating Fan SANYO DENKI Technical Report No.16 Nov. 2003|16 Static Pressure [Pa] Table 2 Characteristic Comparison of the developed product and 40mm sq. x 28mm thickness largest air volume product 109P0412K3023 Max Static Power Sound Pressure Max Air Volume Current Value Model No. Pressure Consumption Level 3 (m/min) (Pa) (A) (W) (dB[A]) 109P0412K3023_Single 0.59 340 0.55 6.6 50 109P0412K3023_2 Series 0.64 470 0.9 10.8 60 9CR0412H502 0.59 320 0.72 8.64 54 9CR0412S502 0.7 450 1.1 13.2 57.5 *109P0412K3023 The value of the two series is measured by SANYO. *The sound pressure level is measured 1m from the fan intake side. 5. Comparison with the Conventional Product Large Air Volume vs. Static Pressure 風量－静圧 特性例 （by SANYO Load Noise Measuring Tnstrnment） （山洋負荷騒音測定装置による） 5.1 Comparison with General Axial Flow Fan 500 9CR0412H501 The characteristic of the product is different from that of a general axial flow fan. 109P0412K3023 Table 2 shows the general characteristics of the SANYO 400 DENKI fan with the largest air volume of the 40 mm sq. x 28 mm class fans (hereafter, it is called 109P0412K3023). Fig. 4 compares the air volume and static pressure of the developed product (H speed) and the existing 109P0412K3023. 300 Though the maximum air volume and the maximum static pressure of 109P0412K3023 are about equal to the H speed of the developed product, as for the aerodynamic performance, the counter rotating fan excels, mainly because there is no 200 depressed area of static pressure in the central part of the curve. 5.2 Comparison with Series of the Two Axial Flow 100 Fans The developed product and 109P0412K3023 are connected in series based on an actual use example provided by the 0 server manufacturer and the performance is compared. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 3 The values in this document of the two series of 3 風量 Air Volume [m /min] [m /min] 109P0412K3023 were measured by SANYO DENKI. Fig.4 Air Volume vs. Static Pressure of Developed Product (H Speed) 5.2.1 Large Air Volume and High Static Pressure and 109P0412K3023 If the air volume versus static pressure is compared when 5.2.2 Low Noise the developed product and 109P0412K3023 are connected in series, maximum air volume of the S speed of the developed Compared with sound pressure level of the two series of product is about equal to the series and the maximum static 109P0412K3023, although the maximum air volume of the S pressure increases about 10% (refer to Table 2). speed of the developed product increases by about 10%, the When the system impedance (load) like Fig. 5 is assumed as sound pressure level decreases by 2.5dB[A] (refer to Table 2). a condition based on actual use, the developed product Moreover, the equal cooling performance of the two series of increases air volume about 20% at S speed (from about 0.41 109P0412K3023 is maintained for the H speed of the 3 3 m /min from to 0.49 m /min increase) and increases static developed product when the system impedance like Fig. 5 is pressure about 40%. assumed, and the load noise at that time is decreased by about Moreover, H speed of the product has an equal, aerodynamic 8dB[A]. characteristic, although it is below in the maximum air volume and the maximum static pressure in the assumed system impedance. 17|SANYO DENKI Technical Report No.16 Nov. 2003 静圧 [Pa] Static Pressure [Pa] Air Volume vs. Static Pressure, 6. Conclusion Sound Pressure Level 風量－静圧・音圧レベル 特性例 （by SANYO Load Noise Measuring Tnstrnment） This document introduces the features and performance of （山洋負荷騒音測定装置による） the newly developed “San Ace 40” counter rotating fan. 9CR0412H501 This developed product is a fan with aerodynamics that 9CR0412S501 could not be achieved by a general axial flow fan. It is an 109P0412K3023 X2series 109P0412K3023 X 2series exciting offering to the 1U server market where heating values System Impedance（example） システムインピーダンス（例） will increase and the density will rise in the future. Moreover, it is possible to contribute to miniaturization and 700 70 high efficiency not only for the 1U server but also for other Air Volume vs. Sound Pressure electronic devices. 風量－音圧レベル特性 600 60 5dB(A) 8dB(A) Honami Oosawa 500 50 Joined company in 1989 Cooling Systems Division, Design Dept. Worked on the development and design of the fan motor 400 40 300 30 Yoshihiko Aizawa Joined company in 1989 Cooling Systems Division, Design Dept. Air Volume vs. 風量－静圧特性 200 20 Worked on the development and design of the fan Static Pressure motor 100 10 Katsumichi Ishihara 0 0 Joined company in 2001 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Cooling Systems Division, Design Dept. 3 3 風量 [m /min] Air Volume [m /min] Worked on the development and design of the fan motor Fig.5 Air Volume vs. Static Pressure, Sound Pressure Level of Developed, 40sq. X 28 thick Largest Air Volume Product (2 Series) Toshiyuki Nakamura Joined company in 1999 At “S speed” the developed product moves a larger volume of Cooling Systems Division, Design Dept. air compared with the two series of 109P0412K3023. It can Worked on the development and design of the fan also provide the air volume of an equal level or more across the motor entire range. Moreover, as for noise load, the developed product has an equal level or decreases about 6dB[A] at maximum. For example, compared with two 109P0412K3023 series when Takashi Kaise system impedance like Fig.5 is assumed, the noise load Joined company in 1990 decreases about 5dB[A], although the operational air volume Cooling Systems Division, Design Dept. increases by about 20% and the operation static pressure Worked on the development and design of the fan increases by about 40%. motor 5.2.3 Low Power Consumption Seiji Nishimura As previously mentioned, the cooling performance of two Joined company in 1997 series of 109P0412K3023 and H speed of the developed product Cooling Systems Division, Production Engineering is about equal under the conditions of the assumed load. When Dept., Production Engineering Sec. the power consumption is compared, the developed product Worked on the development and design of the fan requires 20% less power than the two series of 109P0412K3023 motor (refer to Table 2). SANYO DENKI Technical Report No.16 Nov. 2003|18 Static Pressure [Pa] 静圧 [Pa] 音圧レベル [dB(A)] Sound Pressure Level [dB(A)]