Converter Efficiency At Partial Load - Siemens SINAMICS G130 Engineering Manual

Fundamental Principles and System Description
Engineering Information

Converter efficiency at partial load

Partial load efficiency of SINAMICS G130 and G150 converters
The following diagrams show the efficiency at partial load for SINAMICS G130 and G150 converters for constant-
torque drives. Basis of the calculations is a typical value for the efficiency of the converter at full load of 98 %. The
representation of the efficiency is done in two different ways. The first representation shows the efficiency in
dependency on the converter output frequency for different values of the output current. The second representation
shows the efficiency in dependency on the converter output current for different values of the output frequency.
Fig. 1a) shows the converter efficiency for constant-torque drives in dependency on the converter output frequency
/f , which is in proportion to the motor speed n/n
f
Out Rated
output current I /I , which is in proportion to the motor torque M/M
Out Rated
Fig. 1a)
Efficiency of SINAMICS G130 and G150 converters for constant-torque drives
in dependency on the converter output frequency (specified in %)
Fig. 1b) shows the converter efficiency for constant-torque drives in dependency of the converter output current
I /I , which is in proportion to the motor torque M/M
Out Rated
output frequency f /f
Out Rated
Fig. 1b)
Efficiency of SINAMICS G130 and G150 converters for constant-torque drives
in dependency on the converter output current (specified in %)
SINAMICS Engineering Manual – May 2008
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, which is in proportion to the motor speed n/n
. The representation is done for different values of the
Rated
.
Rated
. The representation is done for different values of the
Rated
.
Rated