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US 2014/0152222 A1Published application
Electronic commutation method in direct current electric motors
AssigneeRobert Bosch GmbH
InventorsAndreas Mueller, Ingo Dwertmann
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AssigneeRobert Bosch GmbH
InventorsAndreas Mueller, Ingo Dwertmann
Estimating the term…
In an electronic commutation method in direct current electric motors which are controlled by pulse width modulation of the energization which takes place periodically with positive and negative current values and intermediate energization pauses, the counter-induction voltage is measured, wherein the zero crossing of the counter-induction voltage is determined by means of the point of intersection of the envelope to the counter-induction voltage with the zero line. The pulse width modulation of the energization is changed if the zero crossing is covered by positive or negative current values of the energization.
An electronic commutation method in direct current electric motors which are controlled by pulse width modulation (PWM) of an energization which takes place periodically with positive and negative current values (1) and intermediate energization pauses, wherein, the counter-induction voltage (2) is measured synchronously with the PWM, characterized in that a zero crossover of the counter-induction voltage (2) is determined at a point of intersection of an envelope (3) of the counter-induction voltage (2) with a zero line (4), wherein the pulse width modulation (PWM) of the energization is changed if the zero crossover is covered by positive or negative current values of the energization.
Dependencies are inferred from the claim text.