By M. Ahmad
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Additional info for Advances in Motor Torque Control
2007). The Steering Effect PM Motor Drives for Automotive Systems. IEEE Industry Applications Magazine, Vol. 14, No. 2, pp. 40-48, ISSN 1077-2618 Endo, S. & Kobayashi, H. (2004). EPS Control Technology. NSK Technical Journal Motion & Control, No. 16, pp. 51-56, ISSN 1342-3630 Aoki, K. & Hori, Y. (2004). Realization of Active Steering with Steering System Using Planetary Gear. 425428, September 2004 Nakano, S et al. (2000). Steering Control for Steer-by-Wire System. KOYO Engineering Journal, No.
For an example of a load with quadratic torque characteristics (Tc), Fig. , with current limitation. The current is kept constant at a predefined value during the whole motor starting time, but the current control can only operate under a rated voltage variation of 10 %. From Fig. 6, it can be noted that through the current limitation (IMAX) the initial electromagnetic torque developed (Te) varies very little until 70% of the synchronous motor speed. However, during the final period of the motor starting process, one can verify the existence of a torque pulse, in which, for certain kinds of loads, an abrupt acceleration can be generated (Palma, 1999).
Fig. 10. Speed, acceleration and current obtained in Experiment 1 using the current control technique. Measures of energy consumption for this experiment were taken. 592 kVArh. Similar current behavior is verified for the torque control technique in Fig. , one point of reference. However, in this case, there is no torque pulse, the speed is quite smooth, and an abrupt acceleration is no longer recognized. Observe that the control is acting directly on the torque profile which is different from the current-control case, where the control did not act directly on the torque profile.
Advances in Motor Torque Control by M. Ahmad