| 摘要 |
A controller for driving a stepper motor 10 with a magnetic rotor and at least one coil comprises a power stage 20 for supplying the at least one coil with current, one analogue Hall sensor 11 for providing a signal as a function of the position of the magnetic rotor with respect to the Hall sensor, and a feedback line 12a connecting the Hall sensor with the power stage 20 to feed the signal of the Hall sensor back to the power stage. The controller may comprise a closed loop with a speed control stage 30 having an input connected to the Hall sensor and an output connected to the power stage. The control stage may be configured to receive the signal of the Hall sensor and to produce a reference signal to be received by the power stage, the reference signal adjusting the amplitude of the signal of the Hall sensor provided via the feedback line. The controller may further comprise a second feedback line 12b connecting the Hall sensor to the input of the speed control stage. The second feedback line may incorporate a frequency-to-voltage converter 14. |
