Electricity: motive power systems – Constant motor current – load and/or torque control
Patent
1998-09-10
2000-04-18
Ro, Bentsu
Electricity: motive power systems
Constant motor current, load and/or torque control
318700, 318720, H02P 700
Patent
active
060519460
ABSTRACT:
The conventional technique can not detect the electrical angle of a synchronous motor in a sensor-less manner when a high torque is required under the condition of a low-speed operation of the motor. The direction that passes through the axis of rotation of the motor and causes a magnetic flux to pass through a permanent magnet is defined as a d axis, whereas the direction that is electrically perpendicular to the d axis in the plane of rotation of the motor is defined as a q axis. In the case where the motor is required to output a high torque, the technique of the present invention applies a predetermined detection voltage to the q axis and determines the electrical angle based on the ratio of electric currents flowing through the d axis and the q axis. Application of a negative voltage to the q axis relieves magnetic saturation occurring on the q axis under a high torque condition and thereby allows detection of the electrical angle. When a positive voltage is applied to the q axis, on the other hand, the technique of the present invention refers to a table which is stored in advance to represent the one-to-one mapping of the electrical angle to the electric current flowing through the q axis, and thereby determines the electrical angle.
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Kawabata Yasutomo
Yamada Eiji
Leykin Rita
Ro Bentsu
Toyota Jidosha & Kabushiki Kaisha
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