P-SPICE SIMULATION OF SPLIT DC SUPPLY CONVERTER

This paper describes a new split source type converter topology for switched reluctance motor drives. The general operating principle of split DC supply converter is done. The discussions of the advantages, disadvantages and applications are done. The phase current and Fourier analysis of the converter is done using P-spice simulation. The main advantage of the converter is fast suppression of the tail current in the phase- winding, hence, resulting in minimization of negative torque using doubly boosted voltage in the demagnetizing mode. The control characteristic of the converter is compared with those of the asymmetric bridge converter that is widely used. The switched reluctance motor (SRM) represents one of the earliest electric machines which was introduces two centuries back in the history. It was not widely spread in industrial applications such as the induction and DC motors due to the fact that at the time when this machine was invented, there was no simultaneous progress in the field of power electronics and semiconductor switches which is necessary to drive this kind of electrical machines properly. The problems associated with the induction and DC machines together with the revolution of power electronics and semiconductors late in the sixties of the last century (1969), led to the re- invention of this motor and redirected the researchers to pay attention to its attractive features and advantages which help with overcoming a lot of problems associated with other kinds of electrical machines such as; brushes and commutators in DC machines, and slip rings in wound rotor induction machines, besides the speed limitation in both kinds. The simple design and robustness of the switched reluctance machine made it an attractive alternative for these kinds of electrical machines for many applications recently, specially that most of its disadvantages which are mentioned in the following chapter could be eliminated or minimized using the high speed and high power semiconductor switches. In industry, there is a very wide variety of designs of the switched reluctance machines which are used as motors or generators, these designs vary in number of phases, number of poles for both stator and rotor, number of teeth per pole, the shape of poles and whether a permanent magnet is included or not. These previous options together with the converter topology used to drive the machine lead to an enormous number of designs and types of switched reluctance machine systems, which means both the switched reluctance machine with its drive circuit to suit different applications with different requirements. It is to be noted that it is well known to those who are interested in this kind of electrical machines that the drive circuit and the machine is one integrated system, one part of such a system can't be separately designed without considering the other part.