Page 22 - FANS. Aerodynamic _Selection Meethod__Combine_part2

Thus, it is possible to get the first (main) point (point “b” - Fig.3) of
reference of the curve of the characteristic of the atmospheric resistance
network Рatv. And compare it with point 'a' (Fig.3) - the value of dynamic

pressure.

Further, with a stepwise decrease in the speed of the electric motor, it is
possible to obtain the remaining points of the curve of the characteristic of
the atmospheric resistance network Patv, - for this type and fan number.

Stand. It may have an upper platform on which a high-power electric motor
is installed (with the maximum standard speed) and with a frequency

converter.

The electric motor is completed with various interchangeable couplings
(“couplings - shafts”) for connection with impellers of different type and
number of fans. Fans (casing and impeller) can be lifted to the electric
motor by the lower lifting platform and will be connected to the electric

motor using interchangeable couplings ('couplings - shafts').

Further aerodynamic testing of the fan is carried out according to the rules
of the manufacturer.