Electric motor apparatus
地域：
Solihull
摘要
An apparatus for controlling an electric motor having a controller, a torque demand limit generator, and a drive stage. The controller may be arranged to receive as an input a torque demand signal indicative of the amount of torque demanded from the motor and to produce as an output a set of motor current demand signals. The drive stage may receive the motor current demand signals and is arranged to cause currents to flow in each phase of the motor as required to meet the demanded torque. The torque demand limit generator may be arranged to output a torque demand limit signal indicative of a torque demand limit above which the battery current would exceed one or more limits.
說明書
where IECU is an estimate of current drawn and is an optional offset to account for current drawn by the control circuit;
da, db, and dc are the duty ratios for the PWM signal for each of the phases a, b and c; and
ia, ib, and ic are the instantaneous phase currents during the conductive part of the PWM cycle.
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