Energy saving motors

Energy saving motors
Pole-changing motors
www.vem-group.com
Pole-changing motors
Drives for industry, craft trades and agriculture
Pole-changing motors
Versatile, reliable and efficient
Pole-changing motors are designed for drives with constant torque characteristics and drives with quadratically rising torque because of the torque characteristics
of the working machine. The motors can be calculated
only for one rated voltage, for example 230 V, 400 V or
690 V. They are generally designed for direct starting by
using the different poles. Other volt­ages and frequencies are available as option.
The pole-changing is done by
› two separate windings
› one winding in Dahlander connection
› two separate windings with one in Dahlander
connection
› two separate windings both in Dahlander
connection.
Whereas it is only possible to reach a speed ratio of 1:2
for a winding with Dahlander connection, two separate
windings offer the possibility of different speed ratios.
However for the same basic design the latter has lower
output.
Alternative speed control without
power electronics
The connection is done as Y or Δ for separate wind­
ings; for windings with Dahlander type the connection
is done as Δ/YY or Y/YY. For the different pole ratios
the connection listed in the tables for motor selection
data is valid. It is possible to use star-delta-starting for
the biggest pole number (smallest speed), if the op­
erating circuit is Δ.
Pole-changing three-phase VEM motors with squirrelcage rotor are available in two designs, based on the
dimensions and sizes specified in IEC 60072.
Pole-changing motors are suitable above all for use in
ventilation systems and general mechanical engineering,
but at the same time also as drives for conveyor belts.
Series Sizes
Power range
Types of protection
Type of construction
Type of cooling
K21R, K22R, K20R
Mounting dimensions to IEC 60072
56 to 355
0.06 – 400 kW
IP 55 acc. to IEC/EN 60034-5, higher types of protection as option
IM B3, IM B5 and derived types of construction acc. to IEC/EN 60034-7
IC 411 acc. to IEC/EN 60034-6
Please refer to our catalogues for technical details. The catalogues are available in
printed or in digital version on DVD. They are also available in the internet.
Pole-changing motors
Pole changing2-times3-times
4-times
Combination of pole numbers
Constant 4-26-2 6-46-4-2
torque
8-2 8-4 8-6 8-4-212-8-6-4
12-212-4 12-68-6-4
Quadratically4-2 6-2 6-4 8-4-2
rising
8-28-4 8-68-6-4
torque
12-212-412-6
© 2015 KOMMUNIKATION SCHNELL GmbH
VEM/05-002 E/0315 Printed in Germany. Subject to change.
VEM Holding GmbH
Pirnaer Landstraße 176
D-01257 Dresden
Phone: +49 351 208-0
Fax: +49 351 208-1028
VEM Sales
Low voltage
Phone: +49 3943 68-0
E-Mail: [email protected]
High voltage
Phone: +49 351 208-0
E-Mail: [email protected]
Drive systems
Phone: +49 30 9861-2104
E-Mail: [email protected]
For detailed information
please visit our website.
www.vem-group.com