Details:

Srijan Control Drives is a manufacturer of DC stepping motors, Ac Synchronous Motors, power  drives and controllers, plastic bag making systems and military aerospace grade motors, Standard “SriSyn” synchronous motors are permanent magnet, AC single, phase motors having instantaneous starting, stopping and reversing characteristics.

These three lead type motors require only a single pole, three position switch - `Forward’, `Reverse’ and `off’ Controls. Starting and running currents are same, so there is no excessive rise in current when these motors are energised. These motors can be completely stalled without overheading. Starting and stopping is accomplished   in less than 5o of shaft rotation, eliminating the need for any brakes. Torque is directly proportional to rms voltage and ROM is directly proportional to supply frequency. Phase shifting resistors and capacitors must be used while operating these motors from single phase supply. However, it is recommended to use two phase transformer for higher torque. It is possible to run two or more motors in synchronisation with each other if the angular difference can be tolerated to 3.6o. Flexible coupling improves starting torque.