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PWM_A PWM_B PWM_C Phase A CurrentandVoltage PhaseB CurrentandVoltage PhaseC CurrentandVoltage BackEMF(Vab) Ia Ib Ic Va Vb Vc PWM=100% PWM=75% S1 S6 S5 S4 S3 S2 S1 S6 S5 S4 S3 S2 BackEMF(Vbc) BackEMF(Vca) 360 o 360 o 0V 0V 0V 0A 0A 0A 0V 0V 0V RESET_A RESET_B RESET_C www.ti.com SLES256 – MAY 2010 Figure 12. Sensorless Control with 6 Steps Trapezoidal Scheme Copyright © 2010, Texas Instruments Incorporated 17 |
