For applications requiring two constant speeds, e.g. for starting and then for stationary operation, a double-speed motor is the most suitable solution.

Our product range for
double-speed motors

Power0.4 - 90 kW
Speed:3000/1500 rpm
1500/1000 rpm
150/750 rpm
Frame size80 - 280
Voltage400 V
Frequency50 Hz
Protection classIP55
Efficiency class-
Insulation classF/B
ColorRAL 7030 (stone grey)
MountingIM B3, IM B35, IM B5, IM B14, IM B34
Type of coolingIC 411 self-cooled, IC 416 forced-air cooling
Coolant temperatureStandard: -20 °C to +40 °C
Installation altitude1000 m above sea level
Housing materialup to frame size 132 – aluminum
from frame size 160 – cast iron
Direction of rotationclockwise / counter-clockwise
Special optionssquared torque

Advice on pole-changing electric motors

Do you have any questions about our models? Is the right motor not available in the desired size or version? Are you looking for motors with more than two speeds (e.g. 3-speed pole-changing motors) or is a motor with a built-in frequency inverter more suitable? Give us a call or send us an e-mail. Our contacts will be happy to take care of your request and provide you with professional advice.
These motors do not currently fall under the Low Voltage Directive, even if only one of the two speeds is used permanently.
There are different versions of pole-changing motors depending on the pole-pair combination. A Dahlander circuit is used with a speed ratio of 1:2, as is the case with 2/4 pole motors or 4/8 pole motors. Motors with this type of circuit (Dahlander motors) have better utilization, as the entire winding is used at both speeds. In contrast, the 1:2 ratio is not maintained with a separate winding. These are, for example, 4/6 pole motors.
Motors with constant torque are wired in Δ/YY. Constant torque means that the torque required to operate a system always remains constant regardless of the speed. The conveyor belt is the best example of this. Motors with square counter-torque, on the other hand, are connected in Y/YY. With square counter-torque, however, the torque increases with the square of the speed.
Your contact person
Our customer service
Tel. +49 (6071) 49887 - 0

All motor variants at a glance

Low-Voltage Motors
Medium and High-Voltage Motors
Frequency converters

Modify and customize your pole-changing asynchronous motor

Most modification options are also available for pole-changing motors. The technicians in our modification workshop can make a wide range of adjustments. Simply contact us with your requirements and we will get back to you directly.