3-Phase BLDC Motor Sensorless Control Using MC56F8013

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Tuning7.5.4.4 OMEGA_MIN_SYSUIf the adjusted speed or actual speed of motor is below this value, the motor is stopped.7.5.4.5 CURR_LIMIT_DESIRED_AThe DC-bus current will be limited above this value. If the DC-bus current is greater than this value, thePWM duty cycle will be limited until the DC-bus current drops again below this value.The current limitation is active the both alignment and running commutation states. An alarm signal is alsogenerated, if current limiting is acting on the output.This parameter can also be set from the DC-bus current gauge on the FreeMaster page.7.5.5 Controller Parametersthe BLDC sensorless application contains three PI controllers.• Speed controller: to keep the motor speed at the desired value; active only during run mode.• Alignment current controller: to keep the alignment current at the desired value; active only duringalignment.• Current limitation controller: to keep the DC-bus current below a desired value; active duringalignment and running.All three PI controllers have same structure. As with all PI controllers, their proportional gain and integralgain can be adjusted.Alignment CurrentSetpoint+Alignment CurrentPI Controller(active if commutationstate = ALIGNMENT)UDesired-Actual DCBus Currentto PWMActual DCBus Current+Current LimitationPI Controller-Limit Current SetpointSpeed Setpoint+-Speed PI Controller(active if commutationstate = RUNNING)UDesiredActual SpeedFigure 7-8. PI Controller StructureIn this application, all PI controllers proportional and integral constants are set experimentally.3-Phase BLDC Motor Sensorless Control using MC56F8013, Rev. 086 Freescale Semiconductor
Motor Related Parameters7.5.5.1 Parameter SummaryParameters for the PI controllers are listed and explained in Table 7-8.Table 7-8. Controller Parameters SummaryName Description Units RangeFreeMasterLocationPI_PROPORTIONAL_GAIN Portion value of proportional gain. FractionFRAC16(0.5)–FRAC16(1.0)Control > PIControllersPI_PROPORTIONAL_GAIN_SCALE Scale value of proportional gain. N/A (-13)–(+13)Control > PIControllersPI_INTEGRAL_GAIN Portion value of integral gain. FractionFRAC16(0.5)–FRAC16(1.0)Control > PIControllersPI_INTEGRAL_GAIN_SCALE Scale value of integral gain. N/A (-13)–(+13)Control > PIControllers7.5.5.2 PI_PROPORTIONAL_GAINPortion value of proportional gain.This value is used with PROPORTIONAL_GAIN_SCALE to build the proportional gain of the application.See 7.5.5.6 PI Algorithm for detailed explanations and parameter ranges.7.5.5.3 PI_PROPORTIONAL_GAIN_SCALEScale value of proportional gain.This value is used with PROPORTIONAL_GAIN to build the proportional gain of the application. See7.5.5.6 PI Algorithm for detailed explanations and parameter ranges.7.5.5.4 PI_INTEGRAL_GAINPortion value of integral gain.This value is used with INTEGRAL_GAIN_SCALE to build the integral gain of the application. See 7.5.5.6PI Algorithm for detailed explanations and parameter ranges.7.5.5.5 PI_INTEGRAL_GAIN_SCALEScale value of proportional gain.This value is used with INTEGRAL_GAIN to build the integral gain of the application. See 7.5.5.6 PIAlgorithm for detailed explanations and parameter ranges.3-Phase BLDC Motor Sensorless Control using MC56F8013, Rev. 0Freescale Semiconductor 87
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3-Phase BLDC Motor SensorlessContro
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3-Phase BLDC Motor Sensorless Contr
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Appendix B.Glossary3-Phase BLDC Mot
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Chapter 1Introduction1.1 Introducti
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Introduction• Ability to sequenti
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Control TheoryVoltage120120Phase AP
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Control Theory2.2 Power StageThe vo
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Control Theory2.3.2 Mathematical Mo
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Control TheoryFigure 2-6 shows that
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Control Theory2.3.3.2 Effect of Mut
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Control TheoryChannel 1 in Figure 2
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Sensorless Drive Conceptcontroller.
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System Blocks Conceptcommutation co
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System Blocks ConceptThe Freescale
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System Blocks ConceptStart MotorAli
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Page 37 and 38: System Blocks ConceptPhase Back-EMF
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Page 45 and 46: Chapter 4Hardware4.1 Hardware Imple
Page 47 and 48: Component Descriptions4.1.2 Hardwar
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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
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Page 77 and 78: Motor Related ParametersThis parame
Page 79 and 80: Motor Related Parameters0: A top, B
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Page 83 and 84: Motor Related ParametersCommutation
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Page 91 and 92: Appendix A.References1. Design of B
Page 93 and 94: Appendix B.GlossaryAC — alternati
Page 96: How to Reach Us:Home Page:www.frees
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3-Phase BLDC Motor Sensorless Control Using MC56F8013

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