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AN2388 データシート(PDF) 21 Page - STMicroelectronics |
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AN2388 データシート(HTML) 21 Page - STMicroelectronics |
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21 / 54 page  AN2388 Vector control of AC induction machines 21/54 Figure 17. Each of the vectors U0, U60, etc., in the diagram represent the six voltage steps developed by the inverter where the zero voltages 0000 and 0111 are located at the origin. At each of these states the inverter transistors are in steady state. In order to develop a sine wave at the motor then we must devise a switching pattern that produces a voltage at not only the six vectors states but also one which transitions in between these states. This effectively means producing a continuously rotating vector Uout that transition smoothly from state to state. SVPWM seeks to average out the adjacent vectors for each sector. Using the appropriate PWM signals a vector is produced that transitions smoothly between sectors and thus provide sinusoidal line to line voltages to the motor. |
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