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Text version of the page
Technical Material
45
A fan generally cools itself as well. The temperature rise of the
motor is relatively low and the temperature rise of the grease in the
bearings is also low, so expected life is longer than general some
either motors. Since the service life of bearings is a theoretical value
that applies when they are ideally lubricated, the life of lubricant can
be regarded as expected life of the fan. The expected life of an AC
fan used at an ambient temperature 60℃ is 25,000 hours. When the
measurement conditions are: L10 (the remaining product life in
the lifespan test is 90%), with an atmospheric temperature of 60
degrees, at the rated voltage and with continuous free air. The
right table indicates the relationship between ambient temperature
and expected life estimated on the basis of our life tests and same
other tests conducted by Sanyo Denki. An accelerated life test is
conducted on the basis of the concept that the expected life halves
as the ambient temperature rises by about 15℃ (within the operating
temperature range of lubricant.)
Reliability and Life Expectancy
Characteristics calculation method and description
Expected life of AC Fans
20
1
2
10
［ﾗ104］
5
40 60 80 100 Ambient temperature（℃）
Expected lif（e H）
Expected life25000h(L10, 60℃)
Rated voltage, continuously run in a free air state, survival rate of 90%
Noise characteristics
Noise is average value that measured at 1 meter away from air intake side of fan
that is suspended on special frame in anechoic chamber (as per JIS B 8330).
Fan
Noise meter
AIR FLOW 1m
Acoustic radio wave anechoic chamber Noise characteristic measurement equipment
Measuring air fl ow and static pressure
It is very diffi cult to measure air fl ow and static pressure. In
fact, the performance curve may vary greatly according to the
type of measuring equiment.
The commonly-used type of measuring equipment is a wind
tunnel using a Pitot tube. Sanyo Denki uses a very precise
method using double chamber equipped with many nozzles.
Q ＝60Avｯ（A）
where
Q = air fl ow（m3/min）
A = cross sectional area of nozzle＝−
4
D2（m2）
D = nozzle diameter
vｯ = average air flow velocity of nozzle＝ 2g─Pn
γ（m/sec）
: Air specifi c gravity（kg/m3）
（γ＝1.2kg/m3 at 20℃ , 1 atmospheric pressure）
g = acceleration of gravity = 9.8（m/sec2）
Pn= differential pressure（mm H2O）
Ps = static pressure（mm H2O）
The measuring equipment using double chanber is method to
be calculated from air fl ow goes through nozzle and differential
pressure between pressure of inside of chamber (Ps) and
atomospheric pressure by measuring differetial pressure
between air intake and exhaust of nozzle (Pn).
Conversion Table
Static pressure
1mm H2O＝0.0394inch H2O
1mm H2O＝9.8Pa（Pascal）
1inch H2O＝25.4mm H2O
1Pa＝0.102mm H2O
1inch H2O＝249Pa
Air fl ow
1m3/min＝35.31ft3/min（CFM）
1CFM＝0.0283m3/min
1m3/min＝16.67 /sec
1CFM＝0.472 /sec
1 /sec＝0.06m3/min
Chamber A
Double chamber measuring equipment
Chamber B
Throttle device
U-shaped tube
U-shaped tube
Pn
Ps
Nozzle
Fan to be measured
BM
Auxiliary blower