Switched Reluctance Motors

The main technologies of electric machines used for electric road vehicles are DC motors, induction motors, permanent-magnet brushless, DC-switched reluctance motors [2]. These different types of electric machines are analyzed in the following sections of this chapter. 

Chapter 11], for instance. Some of these models are presented in Section 8.3. They are more complex than those in the previous sections and are intended or well suited to perform studies demanding more modeling details, like effects of magnetic phenomena and misbehavior due to faults. The induction machine and the switched reluctance motor are treated as example. 

Fig. 8.29 (a) Switched reluctance motor configuration, one tooth per pole, 8/6 (Stat/Rot-saUencies) (b) elementary SRM (c) BG of the electromagnetic-mechanic conversion in the elementary device... 

R. Krishnan. Switched Reluctance Motor Drive. Modeling, Simulation, Analysis, Design, and Applications. CRC Press, Boca Raton, Florida, 2001. 

Rouhani, H., Sadeghzadeh, A., Lucas, C., Araabi, B. N. (2007). Emotional learning based intelligent speed and position control applied to neurofuzzy model of switched reluctance motor. Control and Cybernetics, 36, 75-95. 

The induction motor is very widely used in industrial machines of all types. Its technology is very mature. Induction motors require an AC supply, which might make them seem unsuitable for a DC source such as fuel cells. However, as we have seen, AC can easily be generated using an inverter, and in fact the inverter needed to produce the AC for an induction motor is no more complicated or expensive than the circuits needed to drive the brushless DC or switched reluctance motors. So, these widely available and very reliable motors are suited for use with fuel cells. 

Figure 10.25 Diagram showing the principle of operation of the switched reluctance motor.

Semiconductor control modules gate the thyristors, which switch cm rent to the motor field at the optimum motor speed and precise phase angle. This assures synchronizing with minimum system disturbance. On pull-out, the discharge resistor is reapplied and excitation is removed k> provide protection to the rotor winding, shaft, and external electrical system. The control resynchronizes the motor after the cause of pull-out i.n removed, if sufficient torque is available. The field is automatically applied if the motor synchronizes on reluctance torque. The control is calibrated at the factory and no field adjustment is required. The opti-... 

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