Transcription of Single-Shunt Three-Phase Current Reconstruction …
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Single-Shunt Three-Phase Current Reconstruction …
2009 Microchip Technology 1AN1299 INTRODUCTIONA large number of motor control applications areconsistently and continuously looking for methods toimprove efficiency while reducing system cost. Theseare the two main factors that are driving the efforts toimprove existing motor control techniques, such astrapezoidal control, scalar control and Field-OrientedControl (FOC).FOC has become more popular in recent years due tothe fact that the cost required to implement thistechnique is no longer a constraint. The availabletechnology and manufacturing process now make itpossible to implement this control technique in a 16-bitfixed-point machine such as the dsPIC Digital SignalController (DSC).Efficiency is another reason that has allowed FOC togain ground over scalar and trapezoidal controltechniques on low-cost and mid-cost applications. It isalso well suited in applications in which hardrequirements are low noise, low torque ripple and goodtorque control over a vast speed control can be implemented usingposition sensors such as encoders, resolvers or Hallsensors.
AN1299 DS01299A-page 2 © 2009 Microchip Technology Inc. The three-phase inverter is compounded by three legs. Each leg contains two electronic switches that are
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