9SG1224G102 Datasheet 9SG1212G102, 9SG1224G102 | P1-P3

SANYO DENKI Technical Report No.20 May 2005 16

High Airflow Fan "San Ace 120" SG Type

New Products Introduction

Satoshi Fujimaki

Jirou Watanabe

Toshiyuki Nakamura

Yasuhiro Maruyama

Tetsuya Yamazaki

1. Introduction

In the market for information and communications

equipment (PCs, servers, routers etc.), the increased density

and increased heat generated by equipment have created a

need for fans with higher air flow and higher static pressure,

and so there is great demand for fans measuring 120mm sq.

To answer this need, Sanyo Denki has developed a 120mm

sq. × 38mm thick fan that offers the highest air flow for this

size fan in the industry (as of March 2005). The new fan offers

greatly improved performance as compared to our

conventional products in the series. This report presents an

overview of the features of the newly developed high air flow

San Ace 120 SG type fan.

2. Background to development

120mm sq. × 38mm thick was a groundbreaking size for

cooling fans. For this reason, each company offers a series of

multiple products of this size; Sanyo Denki has already

marketed the R and G types in addition to the L and GL types

that offer long service life. The maximum air flow for Sanyo

Denki's 120mm sq. × 38mm thick fans was 5.1m

/min (180

CFM), and air flow performance above this level could not be

anticipated. However, there continued to be strong market

demand for high air flow fans, and a 120mm sq. × 38mm thick

fan with a maximum air flow of over 5.66 m

/min (200 CFM)

was needed.

In response to this demand, Sanyo Denki developed the San

Ace 120 SG type 120mm sq. × 38mm thick fan that offers an

air flow performance unmatched by existing products.

3. Features of developed product

Fig. 1 shows an external view of the San Ace 120 SG type fan.

The features of the product are as follows:

(1) High air flow and high static pressure

(2) Low ripple current due to 3-phase drive system

4. Product overview

4.1 Dimensional overview

Fig. 2 shows the product dimensional overview.

4.2 Features

4.2.1 General features

Table 1 shows the general features of the newly developed

fan. It offers three rated voltages: 12 V, 24 V and 48 V. The

rated rotating speed is G speed (6000 min

ｰ1

) only, but the

product also offers PWM speed control and voltage instruction

speed control to enable rotational speed control.

Fig. 1 San Ace 120 SG type fan

SANYO DENKI Technical Report No.20 Nov. 200517

4.3 Air flow - static pressure features

Fig. 3 shows the air flow and static pressure features of the

newly developed fan.

4.4 Life span of products

The expected life of the newly developed fan in an ambient

temperature of 60 ℃ is 40,000 hours (survival rate 90%,

continuous operation at rated voltage, free air state, ordinary

humidity).

5. Comparison with conventional products

The newly developed fan greatly increases maximum air

flow and maximum static pressure as compared to our

conventional products. In the development process, the frame

and blade design of the existing fan was greatly modified to

create a new design. A 3-phase drive system was also adopted

for the motor and electronic circuitry to achieve high output.

The result is greatly improved performance.

5.1 Structural comparison

Fig. 4 shows the motor of the San Ace 120 SG type fan. Fig.

5 shows the motor of the existing San Ace 120L G type fan.

The motor of the new fan is a 12-slot, 3-phase motor with

newly developed drive circuits. A high output motor is needed

to achieve high air flow. From a cost standpoint, however, it

was not possible to use expensive rare earth magnets and the

like. For this reason, to increase motor output, either the

motor core diameter had to be made larger, or the coil wire

0123456789

100

150

200

250

300

350

400

450

風量ー静圧特性例

風量［m

/min］

静圧［Pa］

13.8/27.6/55.2V

12/24/48V

10.2/20.4/40.8V

Fig. 3 Sample air flow - static pressure features

(San Ace 120 SG type fan)

Fig. 2 Dimensional overview (San Ace 120 SG type fan)

Sample air flow - static pressure features

Air flow (m

/min)

Static pressure (Pa)

Table 1 General features (San Ace 120 SG type fan)

Rated Operating Rated Rated Rated Maximum Maximum Sound Mass

Model no. voltage voltage range current power rotational speed air flow static pressure pressure level

V V A W min

-1

/min CFM m

/h Pa inchH

O dB(A) g

9SG1212G102 12 10.2∼13.8 4.0 48 6000 7.35 260 441 340 1.37 64 400

9SG1224G102 24 20.4∼27.6 2.0 48 6000 7.35 260 441 340 1.37 64 400

9SG1248G102 48 40.8∼55.2 1.0 48 6000 7.35 260 441 340 1.37 64 400

High Airflow Fan "San Ace 120" SG Type

SANYO DENKI Technical Report No.20 Nov. 2005 18

diameter had to be made thicker. However, for this size fan,

the motor core diameter was already at the limit. With regard

to the coil diameter as well, in the case of the low drive voltage

DC 12V specification, the wire diameter in the motor coil

would have to be made even thicker, and with the existing 4-

slot single-phase 4-electrode configuration, the coil might

protrude from the coil end. For this reason, it was difficult to

provide the necessary number of windings.

Accordingly, although in general fans use a 4-slot

configuration which is advantageous in terms of cost, in this

case we adopted a 12-slot design that allowed thick wire to be

wound efficiently.

With regard to the drive circuits, the conventional products

used a 2-phase half-wave or single-phase full-wave system. For

the new fan, however, as shown in Fig. 6, a 3-phase full-wave

system was adopted. This system enabled current waveform

ripple to be reduced and allowed the heat emitted by the

semiconductor element in the drive circuit to be dispersed.

Moreover, an aluminum die-cast frame was used to enable

the heat from the motor to be efficiently discharged.

The use of these systems enabled the coil temperature rise

to be held to 12 K despite the power consumption of 48 W.

A new frame shape and blade were designed, without

sticking rigidly to the conventional design. Fig. 7 shows a

comparison of the conventional fan with the newly developed

fan. To accommodate the increase in air flow, the number of

Fig. 4 Motor (San Ace 120 SG type fan)

Fig. 5 Motor (conventional San Ace 120L G type fan)

Fig. 6 Current waveform (San Ace 120 SG type fan)

Fig. 7 Comparison of external appearance of newly

developed fan (left) and conventional fan (right)

P1-P3 P4-P5

9SG1224G102

Mfr. #:

Buy 9SG1224G102

Manufacturer:

Sanyo Denki

Description:

DC Fans DC Fan, 120x38mm, 24VDC, High Performance, Ribless

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

9SG1224G102

9SG1224G102

Products related to this Datasheet