SIEMENS
1/27
Siemens D 83.1 · 2016
1
Introduction
General technical specifications
Efficiency, power factor, rated torque, rated speed / insulation and winding
■
Overview
Efficiency and power factor
The efficiency
and power factor cos
for each rated power are
listed in the selection tables in the individual sections of this
catalog.
Rated speed and direction of rotation
The rated speeds are applicable for the rated data.
The synchronous speed changes proportionally with the line
frequency. The motors are suitable for clockwise and counter-
clockwise rotation.
If U1, V1, W1 are connected to L1, L2, L3, clockwise rotation
results as viewed onto the drive-end shaft extension.
Counter-clockwise rotation is achieved by swapping two phases
(see also "Heating and ventilation" on Page 1/28).
Rated torque
The rated torque in Nm delivered at the motor shaft is
P
Rated power in kW
n
Speed in rpm
If the voltage deviates from its rated value within the admissible
limits, the locked-rotor torque, the pull-up torque and the
breakdown torque vary with the approximate square of the
value, but the locked-rotor current varies approximately linearly.
In the case of squirrel-cage motors, the locked-rotor torque and
breakdown torque are listed in the selection tables as multiples
of the rated torque.
■
Overview
High-grade enameled wires, suitable insulating sheet materials,
and the type of impregnation (current UV or vacuum method)
form insulation systems for the motor windings that ensure a high
level of mechanical and electrical strength as well as good
serviceability and a long service life. The insulation system is
suitable for rated voltages up to 1000 V. These insulation
systems protect the winding to a large degree against the effects
of aggressive gases, vapors, dust and oil. They resist the stress
of normal climates in accordance with EN 60721-3 and are
suitable for use in tropical climates. In the case of a damp
alternation climate, which also occurs in various tropical zones,
the special version for increased humidity protection is required.
Silicone rubber encapsulation
Silicone rubber encapsulation is recommended in the following
cases irrespective of the temperature class of the winding:
•
When there is a heightened risk of condensation forming due
to the type of drive or application of the motor.
•
If deposits of highly conductive dust on the winding heads
need to be prevented.
Encapsulation offers particular advantages in combination with
temperature classes F and H for the following requirements:
•
Motors with high switching frequencies
•
Motors for particularly difficult starting and braking conditions
•
Motors with increased mechanical short-circuit strength
of the winding
=
P
1000
9.55
n
T
© Siemens AG 2016