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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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POWERSTEP01 датащи(PDF) 41 Page - STMicroelectronics |
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POWERSTEP01 датащи(HTML) 41 Page - STMicroelectronics |
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41 / 92 page  DocID025022 Rev 5 41/92 powerSTEP01 Phase current control: voltage mode 92 To obtain different current values during acceleration and deceleration phase, two different final slope values, and consequently two different compensation curves, can be programmed. Acceleration compensation curve is applied when the motor runs. No BEMF compensation is applied when the motor is stopped. 8.5 Motor supply voltage compensation The sinewave amplitude generated by the PWM modulators is directly proportional to the motor supply voltage (VS). When the motor supply voltage is different from its nominal value, the motor phases are driven with an incorrect voltage. The powerSTEP01 can compensate motor supply voltage variations in order to avoid this effect. The motor supply voltage should be connected to the integrated ADC input through a resistor divider in order to obtain VREG/2 voltage at the ADCIN pin when VS is at its nominal value (see Figure 18). The ADC input is sampled at fS frequency, which is equal to PWM frequency. Figure 17. BEMF compensation curve AM12835v1 Speed Compensation value INT_SPEED ST_SLP FN_SLP_ACC FN_SLP_DEC Figure 18. Motor supply voltage compensation circuit AM12836v1 ADCIN ADC 5 f PWM ADC_OUT V S V REG R A R B V ADCIN = VS x RB / (R A + R B ) |
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