TAILIEUCHUNG - Recent Developments of Electrical Drives - Part 19

Recent Developments of Electrical Drives - Part 19. The book stating the recent developments of electrical drives, can be useful for engineers and researchers investigating and designing electrical and electronic devices as well as for students and young researchers dealing with electrical and electronic engineering, computer sciences (advanced computer modelling, sophisticated control systems with artificial intelligence tools applied, optimal design bye use of classical and genetic algorithms employed), applied mathematics and all the topics where electromagnetic, thermal, mechanical phenomena occur | 172 Duran et al. PC Control board Target phase voltages Inverter Figure 7. Experimental rig. In order to obtain the real speed a simple algorithm is design that allows selecting the integration step and an accurate speed measurement is achieved. Since the real speed is introduce into the Simulink design it is immediate to compare the real speed with the reference and so the control can be rigorously tested. Experimental results In the experimental results tests are carried out to see the performance in steady state transient state and overcurrent states. In this way the different aspects of the proposed scheme can be tested. Concerning the proposed protection two load tests were carried out one limiting the value of iq to its rated value and the other with the designed protection Fig. 8 . Setting a value of the energy threshold and applying a load torque that makes the motor consumes a current over the rated one it can be observed that the proposed protection permits an overcurrent for a certain time allowing the control to achieve the reference speed 1 000 rpm in the first seconds. When the energy counter reaches the energy threshold the protection acts and the speed falls to a value so that the current is the rated one. The performance is improved in this way since the target values can be followed even when certain transients overcurrents are required. In order to verify the steady-state behavior of the proposed system a constant load test was carried out during time enough to allow the motor heating. The test is carried out considering a target speed of 1 000 rpm and a load torque of approximately half the rated value and it is made with and without the inclusion of the thermal model in the control scheme. Both tests are performed in the same conditions without changing the value of the resistance in the resistor bank. The results of both tests are shown in Fig. 9 where the evolution of the measured motor speed is displayed. The vertical lines are due to the .

TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.