A new current source inverter which is believed to be more advantageous than the autosequentially commutated inverter is proposed. The new current source inverter operates in a much wider frequency range with much lower voltage stress on the motor terminals and power devices. Simulation results show that the new current source inverter is about four times superior to the autosequentially commutated inverter in operating frequency range and in voltage stress. The experimental results are shown for a 5-hp induction motor.
The paper presents a new efficient algorithm for the state encoding of finite-state machines which minimises the area of the combinational logic. The encoding problem is modelled as a construction of a hypercube, where the encoding of each state is given by the co-ordinate of the corresponding vertex of the D-dimensional Boolean hypercube and D is rlog,(number of states)]. The proposed state encoding scheme consists of computing the encoding affinities between states and placing states with strong encoding affinities closely in the hypercube. The algorithms are implemented as a program called SECH. Experimental results show that SECH yields more than 20% better results than NOVA in a comparable CPU time, and about 10% better results than NOVA in about 1/200 of CPU time.
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