Quasioptimal control of synchronous motor with permanent magnets using a strategy of "maximum torque per ampere"
Journal Title: Наукові праці Донецького Національного Технічного Університету серія: Електротехніка і Енергетика - Year 2015, Vol 1, Issue 1
Abstract
For synchronous motors with built-in permanent magnet rotor was made a comparison control strategy "maximum torque per ampere (MTPA)" and the sample vector control algorithm with maintaining component that generates flux of the stator current at zero (Strategy « 0 d i »). To study the value of options was compared stator currents in the steady state for different values of the electromagnetic torque. It has been found that the efficiency of optimal control increases with the time and at low points compared strategies provide nearly identical rela tionship to the current moment. Given these results, as well as the complexity of the implementation of optimal algorithms associated with the necessity of numerical solution of real-time algebraic equation of fourth degree relatively to the stator torque current offers simplified (quasi-optimal) algorithm for maximizing the ratio of torque to the stator current. The nonlinear optimal trajectories in the torque control and speed control systems are replaced by the typical nonlinear trajectories like "dead zone." There was proposed the method of determining boundaries of the insensitivity and the gain of the linear section. With this simplifying in the system of electromagnetic torque control is calculated more easier and does not require the decision of a difficult equation. Performance of the proposed control algorithm of IPMSM tested by simulation. Stator currents in steady state at different moments correspond to the calculated static characteristics.
Authors and Affiliations
Olga TOLOCHKO, A. A. BUGROVOI
Keywords
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