3-Phase BLDC Motor Sensorless Control Using MC56F8013

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Control TheoryChannel 1 in Figure 2-11 shows the disturbed branch voltage, while the other phase (channel 2) is notaffected because it faces balanced mutual capacitance. The imbalance was purposely made by addinga small capacitor on the motor terminals, to demonstrate the effect more clearly. After the imbalance isremoved the branch voltage is clean, with no spikes.Figure 2-11. Balanced Capacity CouplingNOTEThe configuration of the phase winding end turns has a significant impact;it must be managed properly to preserve the balance in the mutualcapacity. This is important, especially for prototype motors, which areusually hand-wound.NOTEFailure to maintain balance of the mutual capacitance can easily disqualifysuch a motor from using sensorless techniques based on the back-EMFsensing. Usually, BLDC motors with windings wound on separate polesshow minor presence of the mutual capacitance. Thus, the disturbance isalso insignificant.3-Phase BLDC Motor Sensorless Control using MC56F8013, Rev. 024 Freescale Semiconductor
Chapter 3System Concept3.1 System SpecificationThe motor control system is designed to drive a 3-phase BLDC motor in a speed-controlled closed-loopsystem. The application meets the following performance specifications:• Sensorless BLDC motor control by back-EMF sensing• Targeted at MC56F8013 platform• Running on a low voltage (12 VDC) 3-phase BLDC motor control development platform• Control technique incorporates:– Sensorless control with closed-loop speed control in run mode and closed-loop current controlin alignment mode– ADC zero crossing detection for sensorless control– Rotation in both directions– Motoring mode– Start from any motor position with rotor alignment– Automatic calibration of phase back-EMF measurements– Manual interface (RUN/STOP switch, UP/DOWN push button control)– FreeMaster software control interface (motor run/stop, speed setup, alarm indicators)– FreeMaster software remote monitor– DC over-voltage, DC under-voltage and DC over-current alarms– Adjustable DC-bus current limitation with software3-Phase BLDC Motor Sensorless Control using MC56F8013, Rev. 0Freescale Semiconductor 25
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 14 and 15: Control TheoryVoltage120120Phase AP
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 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
Page 65 and 66: Application Setup6.2.1 MC56F8013 EV
Page 67 and 68: Projects FilesIn this application,
Page 69 and 70: Chapter 7Tuning7.1 IntroductionThe
Page 71 and 72: 7.3.1.2 UDCBUS_FILT_INDEXFiltering
Page 73 and 74: 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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