Page 242 - Electric Drives and Electromechanical Systems

238 Electric Drives and Electromechanical Systems

FIG. 9.10 A typical controller for a switched reluctance machine operating under velocity control. Where E is a
position transducer used to provide commutation information and T is a conventional velocity transducer.

To achieve a performance similar to a conventional servo-drive, commutation as a
function of rotor position has to be replaced by a control strategy that produces the
desired total motor torques by carefully controlling the individual phase currents.
The approach taken is very similar in principle to that used to control the a.c. induction
motor as discussed in Section 7.3, and in Kjaer et al. (1997). It is clear that the switched
reluctance machine is a very robust machine, that could offer the designer of
high-performance application an additional choice in the drive selection. While the
switched reluctance machine is becoming widely used in high speed applications is has
not been seen in the high-performance position control application.

9.6 Summary
This chapter has discussed a number of current and future systems, which have unique
properties or characteristics. The highlighted drives and actuators will give the designer,
systems with unique characteristics that can be exploited as required.

References
Boyraz, P., Runge, G., Raatz, A., 2018. An overview of novel actuators for soft robotics. Actuators 7 (3), 48.
https://doi.org/10.3390/act7030048.
Chiou, C.H., Lee, G.B., 2005. A micromachined DNA manipulation platform for the stretching and
rotation of a single DNA molecule. Journal of Micromechanics and Microengineering 15 (1),
109e117.
Hameyer, K., Belmans, R., 1999. Design of very small electromagnetic and electrostatic micro motors.
IEEE Transactions on Energy Conversion 14 (4), 1241e1246.
Ikuta, K., Tsukamoto, M., Hirose, S., 1998. Shape memory alloy servo actuator system with electric
resistance feedback and application for active endoscope. In: IEEE International Conference on
Robotics and Automation. IEEE, pp. 427e430.