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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2009 датащи(PDF) 9 Page - STMicroelectronics |
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AN2009 датащи(HTML) 9 Page - STMicroelectronics |
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9 / 39 page  9/39 PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC 3.2 ST METHOD With the ST Method, by using the free-wheeling diodes during the OFF time of the PWM signal, the M potential is put to ground and the ST7MC microcontroller samples the BEMF signal voltage during the OFF time of the PWM signal. This involves the fact that the PWM has to be applied on the high side and that an OFF time is needed as explained in the next section of this application note. However, fewer external components are required as it is no longer necessary to divide and filter the signal coming from the non-powered winding. As shown in Figure 6, only 3 external resistors are needed to limit the current input in the microcontroller pins. Figure 6. ST sensorless control Method C A B HV T4 T1 T0 T3 T2 T5 D0 D2 D4 D3 D5 D1 Low Side outputs High Side outputs ST7FMC Rotor position inputs M 5V internal Vref External Vref Level Shifter |
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