SIEMOSYN Motors 1FU8 SINAMICS SIMOVERT MASTERDRIVES ...

Electrical Design
2.3 DURIGNIT � IR 2000 insulating system
1FU8/2-24
The motor is generally operated in the star circuit configuration and the specified
voltages are present at the windings. If long motor feeder cables are used, then a
possible voltage drop should be taken into account.
For V/f = constant, for a constant torque, the motor current remains approximately
constant over the frequency range.
The motor current slightly increases at higher frequencies. The load currents for
the 50 Hz and f max operating points are listed in the Chapter, Technical Data.
If the motor is connected to a power source, e.g. the motor is connected to a group
of motors which is already running, then the motor starting torque can be a multiple
of the rated current. The starting currents for the 50 Hz and f max operating points
are listed in the selection tables.
At low frequencies, the no-load current can be greater than the rated current. The
approximate current characteristic is shown in Fig. 2-1.
I / I N
1.2
1.0
0.8
20
Fig. 2-1 No-load current characteristic at low frequencies
2.3 DURIGNIT ® IR 2000 insulating system
f(Hz)
09.03
The DURIGNIT ® IR 2000 insulating system is made up of high-quality enamel
wires and insulating materials in conjunction with a resin impregnation which does
not contain any solvents.
This guarantees a high mechanical and electrical strength, high quality and a long
motor lifetime.
The insulating system protects the winding against aggressive gases, vapors, dust,
oil and increased air humidity. It can withstand the usual vibration stressing.
The insulation is suitable up to an absolute air humidity of 30 g water per m 3 . Moisture
condensation should be prevented from forming on the winding. The insulation
is tropics-proof. If you have any higher requirements, please contact your local Siemens
office.
All of the motors have an insulation according to temperature Class F and the motors
are utilized, at the rated power (when fed directly from the line supply or frequency
converter) to temperature Class F.
© Siemens AG, 2003. All rights reserved
SIEMOSYN Motors, 1FU8 (PFU) – 09.03 Edition