9G1212G1021 SANYO DENKI - SANACE FANS, 9G1212G1021 Datasheet - Page 101

• Manufacturer Part Number: 9G1212G1021
• Description: AXIAL FAN, 120MM, 12VDC, 980mA
• Manufacturer: SANYO DENKI - SANACE FANS

Specifications of 9G1212G1021

• External Height: 120mm
• External Width: 120mm
• External Depth: 38mm
• Current Type: DC
• Supply Voltage: 12VDC
• Flow Rate: 137CFM
• Noise Rating: 49dBA
• Power Connection Type: Lead Wires
• Bearing Type: Ball
• Flow Rate - Imperial: 137CFM
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

built-in thermistor type
(4) At an ambient temperature of 30
(5) Test results as installed on equipment: The thermal speed controlled fan displayed its full effect, thus being greatly advanta-
1. Overview
Thermal speed controlled fans with a built-in thermistor are designed that the fan it self contains a thermistor as indicated in Fig. 8.
As illustrated in Fig. 9, the temperature of the air flowing through the fan motor is detected and the fan's speed changes automati-
cally according to changes in that temperature.
2. Typical applications of thermal speed controlled fans with a built-in thermistor
Fig. 11 indicates measurements taken when a 109R0812T4H122 fan is mounted on equipment (a PC) is tested in the state as illus-
trated in Fig. 10.
temperature of the thermistor placed on the cooling fin was 45
decided to add a 1.5 K
35
geous in noise reduction. The ambient temperature during the test was 29℃.
-12dB （ A）
1340
0.22
℃
33
and the fan runs at low (see Table 1 and Fig. 6).
9
0
Thermistor
Fan
Noise level reduction
Part temperature （ CPU）
PC
-9dB （ A）
（ Black ）
1670
0.25
（ Red ）
24
36
Fig. 8
Ω
Thermostatic chamber
Fig. 5
Cooling fan
resistor in series with the thermistor according to Table 1. In this case, the thermistor temperature is
Fig. 7
0.27
1880
39
33
-6dB （ A）
Ambient temperature of equipment
50
Temperature of air flowing through the fan
℃
and an equipment load of 100%, the temperature of the cooling fin was 48
2230
109R0812T4H122
0.38
43
47
-2dB （ A）
E
2470
0.48
45
56
100
（ operating point ）
Rotating speed （ min
Input current of fan
Equipment noise (dB (A))
Temperature rise in parts
（℃）
（A）
Equipment load （ ％）
100
50
0
℃
（Standard values: TL = 30℃, TH = 40℃）
when the fan was running at high speed. It was therefore
-1
Slow rotation
）
3000
2000
1000
0
* An ideal drop in the fan noise level was achieved according
* The current consumption of the fan was 54% lower than in
* The noise level is expected to decline further at lower ambi-
TL
to the equipment load. When the equipment load was 0,
the noise was 12dB (A) lower than in the case of conven-
tional models.
the case of conventional models when the equipment load
was 0.
ent temperatures.
70
60
50
40
30
20
1400min
Fig. 9
TH
-1
20 23
35
30
Speed-variable domain
Fast rotation
Temperature (℃) of air flowing through the f
45
30
2800min
Thermistor temperature （ ℃）
40
35
Temperature of air flowing through the fan
-1
40
Part temperature （ CPU ）
Ambient temperature( ℃ )of equipment
℃
Fan rotating speed
and the surface
図6
99