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AN2281 Datasheet(PDF) 19 Page - STMicroelectronics |
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AN2281 Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 38 page  AN2281 Library parameters 19/38 With the purpose of avoiding too strong a response by the PI regulator at the end of the motor start-up, when the error between target speed and measured speed could be high, PI regulation is enabled (and ramp-up ended) if, during the voltage ramp-up the actual speed of the rotor is higher than an established threshold speed defined by: #define CL_SPEED_VALIDATION xxx // in rpm The control system, therefore, starts the motor as already described for open loop and it enables the PI regulator either at the end of the start-up or when rotor reaches the speed CL_SPEED_VALIDATION. Figure 14 summarizes the closed loop start-up strategy. Figure 14. Closed loop start-up with (b) and without (a) rotor alignment phase |
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