| Abstract |
The accuracy of the speed calculation is generally reduced if the speed calculation is performed at a slower control sampling rate. In this paper, a novel speed regulator is proposed to solve the contradiction of the speed loop fast adjustment and measurement error. Firstly, the measurement speed at each control period is calculated through the differential algorithm of position signal. Then the output of the speed controller is analyzed quantitatively. Base on this, change the speed controller structure to improve the integral effect by using the position feedback directly instead of the original integral item of the PI regulator, so as to avoid the error and delay caused by the process that the position signal differential and integration. Secondly, a speed detection method by period moving average is employed to improve the continuity of the speed feedback. Finally, simulations are used to verify the performance of the proposed speed regulator. Furthermore, experiments are conducted using a surface permanent magnet synchronous machine to compare the performance of the
traditional speed controller and the proposed speed regulator for variable speed operation. Both the simulation and
experimental results show the improvement of dynamic and steady state performances of the proposed speed regulator. |
