Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1996-05-07
1998-07-07
Martin, David S.
Electricity: motive power systems
Limitation of motor load, current, torque or force
318254, 318439, 318432, H02K 1732
Patent
active
057774471
ABSTRACT:
A torque command value is calculated in response to a command. A torque current is calculated on the basis of the calculated torque command value. The torque current is to be driven through an armature winding of the brushless DC motor, and is in phase with an electrical angle of the brushless DC motor. Calculation is made as to a phase advance current to be driven through the motor armature winding. The phase advance current has a phase advance of 90.degree. with respect to the motor electrical angle. A target current is calculated from the calculated torque current and the calculated phase advance current. An actual current through the motor armature winding is controlled in response to the calculated target current. An upper limit of the phase advance current is calculated on the basis of at least one of a speed command and a rotational speed of the brushless DC motor. A determination is made as to whether or not the actual current through the motor armature winding follows the target current. When the actual current through the motor armature winding follows the target current, the phase advance current is decreased within a range having a lower limit equal to zero. When the actual current through the motor armature winding does not follow the target current, the phase advance current is increased within a range having an upper limit equal to the calculated upper limit.
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Martin David S.
Nippondenso Co. Ltd.
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