Title :
The realization of a permanent magnet synchronous motor drive with digital voltage vector selection current controller
Author :
Norum, Lurs ; Ádnanes, Alf Kàre ; Sulkowski, Waldemar ; Aga, Lurs Arne
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Norwegian Inst. of Technol., Trondheim, Norway
fDate :
28 Oct-1 Nov 1991
Abstract :
The realization of a fully digital PMSM (permanent magnet synchronous motor) drive with flux weakening and vector modulation is presented. The controller is implemented in a microcontroller-based single-board computer card. To obtain fast execution time and high current loop bandwidth transformations and switching time sequences for vector modulation were stored in look-up tables. With this solution, a 5 kHz sampling frequency for the current control loop was obtained. The current risetime was measured to 800 μs with an overshoot of approximately 35% in the quadrature axis and 5% in the direct axis at standstill. Some crosscoupling in the two axes was observed. The applied optimum current calculation algorithm gives maximum torque-to-current ratio in the constant torque region as well as in flux weakening. The algorithm simplifies the calculation of the currents phase advance in flux weakening. This was done in an outer loop which was calculated every millisecond. Tests with speed control have shown the validity of the control principle in wide speed range
Keywords :
digital control; electric current control; electric drives; machine control; microcomputer applications; optimal control; permanent magnet motors; synchronous motors; voltage control; 5 kHz; 800 mus; algorithm; current loop bandwidth; digital control; digital voltage vector selection current controller; flux weakening; look-up tables; machine control; microcontrollers; optimal control; permanent magnet synchronous motor drive; sampling; speed control; switching; vector modulation; Bandwidth; Current control; Current measurement; Digital modulation; Frequency; Magnetic modulators; Permanent magnet motors; Sampling methods; Testing; Torque;
Conference_Titel :
Industrial Electronics, Control and Instrumentation, 1991. Proceedings. IECON '91., 1991 International Conference on
Conference_Location :
Kobe
Print_ISBN :
0-87942-688-8
DOI :
10.1109/IECON.1991.239308