Fast position predictive control with current and speed limits for permanent magnet motor systems without weight coefficients

To solve the problems that the weight coefficient of the cost function in the traditional position predictive control is difficult to adjust, and the calculation efficiency of the voltage vector selection is low under the traditional ergodic method, this paper proposes a fast position predictive control strategy with current and speed limits without a weight coefficient. First, the reference voltage vector is predicted. Then the cost function is converted to the voltage dimension to leave out the weight coefficient. After that, the candidate vector selection and the cost function optimization are carried out according to the sector location where the reference voltage vector is located to reduce the number of calculations. Then according to actual system needs, the current and speed limits are integrated into the selection of the alternative voltage vector. At this point, the selected optimal voltage vector is improved through the relationship between the voltage limit circle and the rectangular area to realize the current and speed limit. Finally, experimental results verify that the proposed control strategy has better motion control accuracy and dynamic response speed, without adjusting weight coefficients.