METHOD OF CONTROLLING ELECTRIC MOTORS, CORRESPONDING SYSTEM, ELECTRIC MOTOR AND COMPUTER PROGRAM PRODUCT

摘要

An electric motor is controlled by means of pulse-width modulated control signal having edge transitions occurring at certain transition count values of the pulses of a clock signal which is frequency-modulated with a step-wise frequency modulation (e.g., SSCG or Spread Spectrum Clock Generation). A frequency unmodulated clock signal is provided having a fixed period indicative of the period of the pulse-width modulated control signals. The transition count values are set as a function of a predicted count value and/or a predicted frequency value for the frequency-modulated clock signal. Prediction occurs as a function of the frequency unmodulated clock signal, so that the transition count values are compensated against the step-wise (e.g., SSCG) frequency modulation.

主权项

1. A method of controlling an electric motor, comprising:
providing a frequency unmodulated clock signal having a fixed period indicative of the period of at least one pulse-width modulated control signal, the at least one pulse-width modulated control signal having edge transitions occurring for at least one transition count value (CDUTY_F_W_N, CADC_CONV_K_N) of pulses of a clock signal that is frequency-modulated with a step-wise frequency modulation; and setting said at least one transition count value as a function of at least one of a predicted count value and a predicted frequency value for said frequency-modulated clock signal predicted as a function of said frequency unmodulated clock signal, said at least one transition count value being compensated against said step-wise frequency modulation.