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AN2281 Datasheet(PDF) 18 Page - STMicroelectronics |
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AN2281 Datasheet(HTML) 18 Page - STMicroelectronics |
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18 / 38 page  Library parameters AN2281 18/38 If the alignment phase has been performed, #define START_PHASE xxx //expressed in 360°/65535 also initializes the phase of the sine wave so that the stator and rotor magnetic fields can be synchronous starting from the first electrical period. Moreover, the command lines #define START_UP_DURATION xxx // in msec #define FIN_VOLT xxx // in 1/255 units set the sine wave amplitude at the end of the ramp-up and the ramp-up duration. 5.2.3 Open loop driving mode Once the voltage ramp-up is over, open loop driving mode allows you adjust the amplitude of the sinusoidal three-phase voltage applied to the motor using potentiometer Pot1. The minimum and maximum amplitudes are definable and the related command lines are: #define MAX_VOLTAGE xxx // Expressed in 1/255 units #define MIN_VOLTAGE xxx //Expressed in 1/255 units Figure 13 summarizes the basics of open loop driving mode: Figure 13. Open loop start-up with (b) and without (a) rotor alignment phase 5.2.4 Closed loop driving mode for speed regulation Closed loop driving mode includes a PI regulator acting on the amplitude of the three-phase voltage for speed regulation. You set the target speed using potentiometer Pot. The minimum and maximum target speeds are definable by command lines: #define MIN_SPEED xxx //in rpm #define MAX_SPEED xxx // in rpm You can optimize the dynamic response of the system by acting on the sampling time and the proportional and integral constants of the PI regulator in following command lines: #define SAMPLING_TIME xxx //in msec #define kp xxx #define ki xxx |
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