Apparatus for controlling an a. c. motor

Details Apparatus for controlling an a. c. motor Apparatus for controlling an a. c. motor

2006-07-11

2006-07-11

Duda, Rina (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S254100, C318S255000, C318S432000, C318S434000, C318S727000, C318S599000, C318S811000

Reexamination Certificate

active

07075266

ABSTRACT:
A method controls a torque of an a. c. motor which does not cause a shortage of torque by using an economical current detection which estimates d- and q-axis currents Idc, Iqc from d. c. current IDC flowing through an input d. c. bus line of a power converter. A value of d- and q-axis motor currents Id, Iq of a rotational coordinate system are estimated from detected input d. c. current IDC flowing through the bus line of the power converter to which power is input from a d. c. power source21. A output voltages of the power converter2are controlled so that the estimated currents Idc, Iqc are equal to respective current instruction values Id*, Iq*. Errors of motor constants are determined from information on the motor currents and the rotational phase errors by an operation.

REFERENCES:
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patent: 2001-251889 (2001-09-01), None
“Development of full automatic washing machine which is controlled by an inverter.” Institute of Electrical Engineers of Japan (IEEJ), 1999, pp. 5 (2 pgs Japanese, 1-3 Translation).

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