AN2388 datasheet(21/54 Pages) STMICROELECTRONICS

Part #	AN2388

Description	Sensor field oriented control

PDF	54 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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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.

AN2388 Datasheet(PDF) 21 Page - STMicroelectronics