Siemens SIMOTICS M-1FE2, Configuration Manual

Page: 67 / 162

Motor components and options
4.1 Motor components
SIMOTICS M-1FE2 built-in motors
Configuration Manual, 05/2021, A5E50494252B AB
65
4.1.3.4 Cooling powers to be dissipated (power loss)
You can determine the cooling power to be dissipated based on:
•
Reading off the power loss at rated power for n
max
or n
N
in the table "Cooling powers to be
dissipated".
• Using the calculation tool.
The power loss can be calculated within the shaded area of the subsequent diagram for
any load state and speed. P and n must lie within the shaded area. The general conditions
③ and ④ must be complied with.
① Cooling power to be dissipated at rated speed
② Cooling power to be dissipated at maximum speed
③ For n < n
N
, the following applies: P ≤ P
N
x n / n
V
④ For n
N
< n < n
max
, the following applies: P ≤ P
N
Figure 4-7 Calculating the power loss
You can calculate the power loss using the following program: Calculation of the cooling
power to be dissipated (power loss) (Page 66)
The intermediate values of the cooling power can be interpolated linearly in the ratio to
the speed.
The cooling power to be dissipated depends on the rated power
P
N
of the motor. If the
motor is operated with reduced power, then the cooling power to be dissipated decreases
in an approximately linear relationship.