Proper operation of a PMSM requires aligning the commutation phase with motor shaft position. Many applications use an external sensor for this purpose. These sensors add cost weight and reduce the reliability of the system. Sensorless control means commutation without the need for position sensor, as well as closing velocity and\or position control loops. Click here to download a presentation on this topic. Please contact us at info@servotronix.com to get information about how we can help with your application.