Electric motors fed by alternating current convert the grid's sinusoidal voltage into a rotating magnetic field in the stator, producing mechanical torque. This straightforward principle makes AC motors the most common drive for pumps, fans, conveyors and machine tools. DRG Motor supplies three-phase AC motors for the 400 V / 50 Hz grid in ratings from 0.55 kW up to 355 kW.

Synchronous and Asynchronous AC Motors

AC motors fall into two main families. In asynchronous (squirrel-cage) motors the rotor turns slightly behind the rotating field, with a small slip; their simple, brushless and rugged construction makes them the dominant choice in industry. Synchronous motors lock the rotor to the supply frequency and are preferred where constant speed and a high power factor are required.

Speed and Pole Count

The synchronous speed of an AC motor is set by its pole count: on a 50 Hz supply, 2 poles give 3000 rpm, 4 poles 1500 rpm and 6 poles 1000 rpm. In an induction motor the actual speed sits about 2 to 4 percent below these values under load because of slip. The correct pole number is selected to match the speed demanded by the driven equipment.

Protection and Insulation

Industrial AC motors are typically built to IP55 protection, with Class F insulation and an S1 continuous duty rating. IP55 guards against dust and water jets, while Class F windings withstand up to 155 °C. The choice between a cast iron or aluminium frame depends on the ambient conditions and the mechanical load the motor must carry.

DRG Motor AC Solutions in Izmir

As an Izmir-based supplier, DRG Motor supplies application-specific AC motors with B3 foot, B5 flange and B14 face mounting options. Efficiency classes from IE2 to IE4, winding designs suitable for speed control by frequency inverter and fast lead times let plants source the right motor without delay.