A two-region control of permanent magnet synchronous motors

At present permanent magnet synchronous machines (PMSM) find more and more application in various areas of engineering. It is connected with high reliability, efficiency, simple construction, sources of rotor heating and excitation losses absence in such motors in comparison with other machines. Because of the fact that such motors have the above-mentioned advantages, application of PMSM to two-region control is desirable, where at the first sight their application is not obvious and even paradoxical. As the traditional implementation of the two-region PMSM drive control, connected with changing magnetic flux is impossible, special methods of control are necessary. For two-region regulation motors with permanent magnet, additional channel of control, which will stabilize e.m.f., is necessary. The additional mechanical channel may be designed by shifting separate motor´s parts. The two-region regulation of PMSM may be provided by vector control, which is based on representation of motor input signals as space vectors. Methods and algorithms of permanent magnet motors two-region control are presented in this paper. Assessment of PMSM range regulation, taking into account the current and demagnetizing magnets constraints, has been carried out.