AC synchronous motors will be the workhorses of industry. With synchronous electric motor technology, speed is directly proportional to AC input frequency – for example, at 120 Vac, 60 Hz, an AC synchronous motor will turn at 72 rpm. This speed can be varied by different the frequency, although many applications simply use gearing or a belt- or chain-drive Stainless Steel Chain system to achieve the desired load speed.
We offer a comprehensive selection of AC synchronous electric motor products including continuous torque, high torque and hybrid options to meet a wide range of application requirements. Our 
synchronous motors provide many advantages, like the ability to start within 1-1/2 cycles of the applied frequency and reach complete synchronous speed within 5 to 25 milliseconds. They are able to also stop within 5 degrees of rotation and reverse similarly rapidly.
We offer two groups of AC synchronous motors in the ST/SN Series and KS/SS Series. High performance motors in these series are offered in NEMA 23, 34 and 42 body sizes, with two- and three-phase models obtainable in each size. Resistor-capacitor kits are available for operating two-stage synchronous motors from a single-phase power source. We also provide hazardous duty AC synchronous motors, qualified to UL Course I, Division 1, Group D; UL Class 1, Division 2, Groups Electronic, F and G; and ATEX requirements.