SIEMENS
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Siemens D 83.1 · 2016
1
Introduction
General technical specifications
Technical definitions for pole-changing motors
■
Overview
General information
Mechanically, all pole-changing motors correspond to the
single-speed motors. Pole-changing motors in frame size 225
and above of the 2-pole level have the same bearings and the
same shaft extensions as the corresponding frame sizes of the
single-speed 2-pole motors.
Voltage and frequency
The pole-changing motors in this catalog are supplied for the
following voltages in 50 Hz supply systems: 400 V, 500 V or
690 V.
Within the range of these voltages, motors can be supplied with
abnormal windings for any rated voltage required. For rated
voltages below 400 V as well as different frequencies, it is
essential to inquire.
Power
The power ratings specified in the selection tables apply to
duty type S1 according to EN 60034-1.
With regard to coolant temperatures above 40 °C and
installation altitudes above 1000 m above sea level, the same
points apply as for single-speed motors.
Torque
The pole-changing motors can be started up from standstill
whatever the number of poles. In the power rating tables, the
starting torques are specified for direct switch-on and the rotor
classes. The high speed levels can have pull-up torques; so
where possible start-up must be performed at the lower speed
levels. Starting is improved as a result, and with heavy starting
the temperature rise is reduced.
The pole-changing motors included in the power rating tables
are supplied for 2 or 3 fixed speed levels.
If power levels are required other than those listed in the catalog,
the motors in Dahlander circuits can also be supplied with
2 separate windings. The power will, however, be considerably
lower than for a motor with a Dahlander circuit. The following
variants are available:
Circuit diagrams for two speeds
Speed ratio 1:2; 1 winding (Dahlander) circuit
/YY for constant torque
4-/2-, 8-/4- and 12-/6-pole
Speed ratio 1:1.5 and 1:1.33; 2 separate windings in Y/Y or Y/
or
/Y
circuit for constant torque 6-/4-pole and 8-/6-pole, for torque that reduces
in accordance with the square law 6-/4-pole and 8-/6-pole
Speed ratio 1:2; 1 winding (Dahlander) circuit Y/YY for torque that
reduces in accordance with the square law (fan drive) 4-/2-pole,
8-/4-pole and 12-/6-pole
Speed ratio 1:1.5 and 1:1.33; 2 separate windings in
/
or Y/
or
/Y
circuit for constant torque 6-/4-pole and 8-/6-pole, for torque that reduces
in accordance with the square law 6-/4-pole and 8-/6-pole
1W
X 1301
(W1)
(V1)
(U1)
(W2)
(V2)
(U2)
(W3)
(V3)
(U3)
(W4)
(V4)
(U4)
1V
1U
1U
L1
L2
L3
2U
1V
2V
1W
2W
1V
2V
L1
L2
L3
1W
2W
1U
2U
2U
2V
2W
∆ low speed
high speed
G_D083_EN_00048
1U
1V
1W
X 1401
1U
L1
L2
L3
2U
1V
2V
1W
2W
1V
2V
L1
L2
L3
1W
2W
1U
2U
2U
2V
2W
high speed
low speed
G_D083_EN_00050
X 1302
2U
2V
2W
1W
(W1)
(V1)
(U1)
(W2)
(V2)
(U2)
(W3)
(V3)
(U3)
(W4)
(V4)
(U4)
1V
1U
1U
L1
L2
L3
2U
1V
2V
1W
2W
1V
2V
L1
L2
L3
1W
2W
1U
2U
low speed
high speed
G_D083_EN_00049
X 1401
2U
(2W1)
(2V1)
(2U1)
(2W2)
(2V2)
(2U2)
2V
2W
1U
(1W1)
(1V1)
(1U1)
(1W2)
(1V2)
(1U2)
1V
1W
1U
L1
L2
L3
2U
1V
2V
1W
2W
1V
2V
L1
L2
L3
1W
2W
1U
2U
∆ low speed
∆ high speed
G_D083_EN_00051
© Siemens AG 2016