| Abstract |
This paper presents the design of a very simple and economical Microcontrolled lnverter Modulator, based on the INTEL 8031, able to drive a three-phase induction motor over a wide frequency range (0.1 to 100 Hz), allowing an independent selection of the normalized fundamental voltage demand, output frequency and sense of rotation. Both Subharmonic PWM technique and Precalculated Switching Angle patterns, quantized using the Twelfth Mode and processed using the new Counter Number Method, developed by the authors, are employed in the implementation. Two Programmable Analog Pulse Generators are presented and their advantages and disadvantages are discussed. |
