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ST72141K Datasheet(PDF) 42 Page - STMicroelectronics |
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ST72141K Datasheet(HTML) 42 Page - STMicroelectronics |
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42 / 132 page  ST72141K 42/132 MOTOR CONTROLLER (Cont’d) Figure 27. Example of Command Sequence for 6-step Mode (typical 3-phase PMDC Motor Control) 0 1 2 3 4 5 A B C Node Step Σ 1 Σ 2 Σ 3 Σ 4 Σ 5 Σ 6 Σ 1 Σ 2 Σ 3 C A B HV T4 T1 T0 T3 T2 T5 I4 I1 I3 I6 I2 I5 HV HV/2 0 HV HV/2 0 HV HV/2 0 Demagnetization D2 Z2 C2 C4 D5 Z5 Σ 2 Σ 3 Σ 4 Σ 5 Commutation delay Wait for BEMF = 0 HV HV/2 0V t Note: Control & sampling PWM influence is not represented on these simplified chronograms. Switch Σ 1 Σ 6 PWM off pulses (BEMF induced by rotor) Superimposed voltage - approx. HV/2 (PWM on) - approx. 0V (PWM off) |
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