3-Phase BLDC Motor Sensorless Control Using MC56F8013

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Control TheoryVoltage120120Phase APhase BPhase CElectricalAngle30 60 90120150 180 210 240 270 300 330030Figure 2-2. Three Phase Voltage System for a BLDC MotorFigure 2-3 shows the number of waveforms, the magnetic flux linkage, the phase back-EMF voltage, andthe phase-to-phase back-EMF voltage. The magnetic flux linkage was measured by calculating theintegration phase back-EMF voltage, which was measured on the non-fed motor terminals of the BLDCmotor. As can be seen, the shape of the back-EMF is approximately trapezoidal and the amplitude is afunction of the actual speed. During speed reversal, the amplitude, sign and phase sequence are allchanged.The filled areas in the tops of the phase back-EMF voltage waveforms indicate the intervals where theparticular phase power stage commutations are conducted. As can be seen, the power switches arecyclically commutated through the six steps. The crossing points of the phase back-EMF voltagesrepresent the natural commutation points. During normal operation, commutation is performed here.Some control techniques lead the commutation by a defined angle to control the drive above the PWMvoltage control.3-Phase BLDC Motor Sensorless Control using MC56F8013, Rev. 014 Freescale Semiconductor
The Brushless DC MotorPhase Magnetic Flux LinkagePs i_APs i_BPs i_CPh. A Ph. BPh. CAtop Btop CtopPh. APh. BPh. CPhase Back-EMFSpeed reversalUi_AUi_BUi_CCbot Abot BbotActing power switch in the power stageA-AB-BC-CPhase-Phase Back-EMFUi_A BUi_BCUi_CAFigure 2-3. BLDC Motor/Back-EMF and Magnetic Flux3-Phase BLDC Motor Sensorless Control using MC56F8013, Rev. 0Freescale Semiconductor 15
Page 1: 3-Phase BLDC Motor SensorlessContro
Page 4 and 5: 3-Phase BLDC Motor Sensorless Contr
Page 7 and 8: Appendix B.Glossary3-Phase BLDC Mot
Page 9: Chapter 1Introduction1.1 Introducti
Page 12 and 13: Introduction• Ability to sequenti
Page 16 and 17: Control Theory2.2 Power StageThe vo
Page 18 and 19: Control Theory2.3.2 Mathematical Mo
Page 20 and 21: Control TheoryFigure 2-6 shows that
Page 22 and 23: Control Theory2.3.3.2 Effect of Mut
Page 24 and 25: Control TheoryChannel 1 in Figure 2
Page 27 and 28: Sensorless Drive Conceptcontroller.
Page 29 and 30: System Blocks Conceptcommutation co
Page 31 and 32: System Blocks ConceptThe Freescale
Page 33 and 34: System Blocks ConceptStart MotorAli
Page 35 and 36: System Blocks ConceptAfter several
Page 37 and 38: System Blocks ConceptPhase Back-EMF
Page 43 and 44: System Blocks Concept• Zero cross
Page 45 and 46: Chapter 4Hardware4.1 Hardware Imple
Page 47 and 48: Component Descriptions4.1.2 Hardwar
Page 49 and 50: Component DescriptionsThe SMOS eval
Page 51 and 52: Component DescriptionsMotorConnecto
Page 53 and 54: Chapter 5Software Design5.1 Introdu
Page 55 and 56: Main Software Flow ChartMain LoopIs
Page 57 and 58: 5.3.1 Application State Machine Pro
Page 59 and 60: Chapter 6Application Setup6.1 Appli
Page 61 and 62: Application Descriptionfault signal
Page 63 and 64: The FreeMaster software supports th
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Application Setup6.2.1 MC56F8013 EV
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Projects FilesIn this application,
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Chapter 7Tuning7.1 IntroductionThe
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7.3.1.2 UDCBUS_FILT_INDEXFiltering
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Application Related ParametersOutpu
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Application Related Parameterscommu
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Motor Related ParametersThis parame
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Motor Related Parameters0: A top, B
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Motor Related ParametersFor a detai
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Motor Related ParametersCommutation
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Motor Related ParametersWhere;T_Cmt
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Motor Related Parameters7.5.5.1 Par
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Motor Related ParametersThe integra
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Appendix A.References1. Design of B
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Appendix B.GlossaryAC — alternati
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How to Reach Us:Home Page:www.frees
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3-Phase BLDC Motor Sensorless Control Using MC56F8013

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