3-Phase BLDC Motor Control with Sensorless Back EMF ... - Freescale

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SW Design DC-Bus Current (A/D) I_Dc_Bus Omega_Required_Mech ApplicationMode Cmd_Application Process Current PI Controller Manual Speed PC Setting Master U_Desired Process Application State Machine Omega_Desired_Mech Process Speed PI Controller START/STOP Switch Omega_Actual_Mech Process PWM Generation Status_Commutation BldcMode Step_Cmt, Cmt_Drv_RqFlag PVAL0,PVAL1 PVAL2,PVAL3 PVAL4,PVAL5 Figure 7-3. Data Flow - Part 1 3-Phase BLDC Motor Control, Rev. 1 BEMF Zero Crossing Comparators Process Commutation Control 36 Freescale Semiconductor Preliminary
Protection processes are shown in Figure 7-4 and described in the following sub-sections. DC-Bus Current (A/D) I_Dc_Bus Process Application State Machine Temperature (A/D) Temperature Process Fault Control DriveFaultStatus DC-Bus Voltage (A/D) U_Dc_Bus 3-Phase BLDC Motor Control, Rev. 1 Process PWM Generation PWM Faults (OverVoltage/OverCurrent) PVAL0,PVAL1 PVAL2,PVAL3 PVAL4,PVAL5 Figure 7-4. Data Flow - part2 Data Flow 7.2.1 Process Application State Machine This process controls the application subprocesses by status and command words as can be seen in Figure 7-3. Based on the status of the Status_Commutation (set by the Commutation Control process) the Cmd_Application Rq flags are set to request calculation of the Current PI Controller (Alignment state) or Speed PI Controller (Running state) and to control the angular speed setting (reflects the status of the START/STOP Switch and the Run/Stop commands). 7.2.2 Process Commutation Control This process controls sensorless BLDC motor commutations as explained in Section 5. Its outputs, Step_Cmt and Cmt_Drv_RqFlag, are used to set the PWM Generation process. The output Omega_Actual_Mech is used for the Speed Controller process. 7.2.3 Process Speed PI Controller The general principle of the speed PI control loop is illustrated in Figure 7-5. Freescale Semiconductor 37 Preliminary
Page 1 and 2: Freescale Semiconductor Application
Page 3 and 4: Table 2-1. Memory Configuration 56F
Page 5 and 6: Stator Stator winding (in slots) Sh
Page 7 and 8: 3.3 Why Sensorless Control? 3-Phase
Page 9 and 10: 3.4.1 Mathematical Model The follow
Page 11 and 12: 3.6 Back-EMF Sensing Circuit 0 30 6
Page 13 and 14: • Running on one of three optiona
Page 15 and 16: Power line PC Master START STOP UP
Page 17 and 18: PWM1 S At PWM2 S Ab PWM3 S Bt PWM4
Page 19 and 20: 3-Phase BLDC Motor Control, Rev. 1
Page 23 and 24: 5.4.2.2 Running - Commutation Times
Page 27 and 28: Phase Back-EMFs Back-EMF Zero Cross
Page 31 and 32: 6.3 Low Voltage Hardware Set The sy
Page 33 and 34: 7. SW Design 3-Phase BLDC Motor Con
Page 35: Interrupt Up Button Up Button ISR:
Page 39 and 40: 7.3.1 Main SW States - General Over
Page 41 and 42: • Starting (Back-EMF Acquisition)
Page 43 and 44: 7.3.4.3 Commutation Control - Set R
Page 45 and 46: 7.3.6 State Diagram - Process Curre
Page 49 and 50: 11. Setting of SW parameters for ot
Page 51 and 52: 11.2.2 Start-up Periods The constan
Page 53 and 54: Coef_CmtPrecompLShft Coef_CmtPrecom

3-Phase BLDC Motor Control with Sensorless Back EMF ... - Freescale

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