Pole-changing electric motors
Compared to normal three-phase motors with a fixed speed, pole-changing electric motors usually have 2, sometimes 3 different speeds that are also fixed. These result from the respective number of motor poles.
Even if their use has been greatly reduced through the use of frequency converters, pole-changing motors are still considered a simple alternative for realizing speed changes. In addition, these motors are not subject to the efficiency specifications and can continue to be used in IE 1.
2/4-pole motors with speeds of 2800/1400 rpm are mostly used.
These, as well as the following numbers of poles, can be delivered by us individually tailored to your needs:
4/8 poles –> speed 1400/700 rpm + 2/6 poles –> speed 2800/900 rpm
4/6 pole -> speed 1400/900 rpm + 2/8 pole -> speed 2800/700 rpm
4/8-pole -> speed 1400/700 rpm as well as combinations with 10 & 12-pole motors and with 3 different speeds
Pole-changing motors are used, among other things, in the carriage or transport of cable cars or bulk goods, for example, as well as in the running gear and hoisting gear of cranes.
Of course, you can also get our electric motors with built-on gearbox as geared motors - individually according to your needs.
- Available designs: B3, B14, B34, B5, B35
- Motor power range from 0.06 – 200 kW available
- Degree of protection up to IP55 / F
- possible number of poles: 2/4, 2/6, 2/8, 4/6, 4/8 and 10 & 12 poles
- Mounting dimensions according to IEC
Materials & Options
- Housing and end shields are made of aluminum
- Equipped with ZZ-C3 roller bearings from well-known manufacturers such as SKF or NSK or NTN
- PTC thermistor sensor
- Temperature bimetallic contact PTO
- external fan
- special flanges
- special shafts
- Additional accessories possible
At a glance
The new generation of pole-changing GEMOTEG three-phase motors in an aluminum housing are manufactured in accordance with our specifications and ISO 9001. They feature a multi-mounting aluminum housing; Degree of protection IP55/ Iso F; ZZ warehouse and IEC standard conformity. In addition, they are suitable for frequency converter operation. Also available with PTC thermistor sensor, PTO temperature bimetallic contact or external fan.