Method for actuating a bldc motor
AssigneeMagna Electronics Inc.
InventorsVolker Steigerwald, Mirko Kress, Rudolf Polzer
Life of this patent
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Abstract
A method for actuating a BLDC motor for reducing the current ripple in an intermediate circuit capacitor includes means for monitoring pulse width modulated signals (PWMU, PWMV, PWMW) for each motor phase (U, V, W), which add motor phase currents Iu, Iv, Iw) of two adjacent phases in a first step, and add the respective pulse width modulated signals (PWMU, PWMV, PWMW) if the added currents value is over zero, and shift the phase of at least one pulse width modulated signal (PWMU, PWMV, PWMW) in the time slot T if the added signals result is greater than 1.
Claims18
A method for actuating a brushless direct-current motor (BLDC motor) for reducing the current ripple in an intermediate circuit capacitor, characterized in that devices to control pulse width modulated signals (PWMu, PWMv, PWMw) are available for each motor phase (U, V, W) and that, in a first step, motor phase currents (Iu, Iv, Iw) of two adjacent phases are added and, if the added value is above zero, then the respective pulse width modulated signals (PWMu, PWMy, PWMw) are added and if the result is greater than 1, then the phase of at least one pulse width modulated signal is offset in a time slot T.
A controller for actuating a brushless direct-current motor (BLDC motor) for reducing the current ripple in an intermediate circuit capacitor, said controller comprising:
- devices to control pulse width modulated signals (PWMu, PWMv, PWMw) available for each motor phase (U, V, W);
- wherein, in a first step, the controller adds motor phase currents (Iu, Iv, Iw) of two adjacent phases;
- wherein, if the added currents value is above zero, then the controller adds the respective pulse width modulated signals (PWMu, PWMy, PWMw);
- and
- wherein, if the added signals value is greater than 1, then the controller offsets the phase of at least one pulse width modulated signal in a time slot T.
Dependencies are inferred from the claim text.