Design And Realization Of Alternatig Current Permanent Magnetic Synchronous Motor Digital Driver

The Alternating Current Permanent Magnet Synchronous Motor (PMSM) is one kind of Brushless Permanent Magnetic motor .With the fast development of electronic technology and the application of high performance rare-earth magnetic materials, the Permanent Magnet Synchronous Motor (PMSM) has been applied widely. .Because the magnetic flux and the Voltage wave are sine wave, the Motor vector control theory can be applied to PMSM. The PMSM has the advantages of AC motor and DC brushless motor such as simplicity, reliability, high efficiency, long life and easy maintain, it also has the advantages of DC motor as high linear torque output, easy control, and outstanding dynamic performance. Thanks to the advantages of AC motor and DC motor, PMSM has been widely applied recently especially in Factory Automation (FA), defense industry, automobile and robots industry. The trend of widely application will continue.The article concludes the processing of developing PMSM velocity controller. The article introduces the PMSM structure, working principle, controller hardware designing, velocity PI control, vector control theory, assembly program realization.The linear hall sensors are introduced for the rotator position measurement. Compared with the resolver, the linear Hall sensor is cheaper. For instance, the linear hall sensors are cheaper and simple. Compared with optical–electrical encoders, the linear hall sensors are more reliable [1]. According to the mechanical structure of optical-electrical encoder, there is optical glass with code inside which is installed with the axle of PMSM. The glass is vulnerable when the motor running and installation. However the linear hall sensors are attached to the fixed part of motor and with any physical touch with the rotating axle, it is more reliable and simple than the optical–electrical encoder. [2]Issues will happen when the power circuit noises feed back to the control circuit .In the article a new multiple isolated power supply for up bridge of power component driving has been introduced, which can solve the issue as noise interference from power circuit and boost circuit [3]. Compared with the power boost circuit, it is easier to connect the control circuit with the power circuit (IGBT or MOSFET), and it is more reliable then the boost circuit. Anymore, because of the electrical isolation, the power circuit noise can't be feed back to control circuit.