METHOD OF CONTROLLING A THREE-PHASE INDUCTION MOTOR

Title:

METHOD OF CONTROLLING A THREE-PHASE INDUCTION MOTOR

Document Type and Number:

WIPO Patent Application WO/1987/001250

Kind Code:

A1

Abstract:

A method of controlling a three-phase induction motor in which a primary current is formed as a current command by taking all of the constants of an induction motor (d) into consideration to obtain a linear output torque with respect to the torque command (Tm), and a voltage is detected at a DC link portion to change the excitation flux command based upon the DC voltage (V). Therefore, the output can be maintained constant irrespective of changes in the power source voltage. Provision is further made of a power factor adjusting means (q) to adjust the phases of the voltage and current of the AC power source side during the regenerative braking operation, so that the reactive power decreases.

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Inventors:

FUJIOKA YOSHIKI (JP)
KOUNO SHINICHI (JP)
SHINOHARA TATSUO (JP)

Application Number:

PCT/JP1986/000420

Publication Date:

February 26, 1987

Filing Date:

August 14, 1986

Export Citation:

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Assignee:

FANUC LTD (JP)

International Classes:

H02P21/00; H02P27/04; H02P21/08; H02P21/14; H02P21/16; H02P21/18; H02P21/22; H02P21/24; H02P21/28; H02P23/07; H02P23/08; H02P23/14; H02P23/16; H02P23/26; H02P27/08; (IPC1-7): H02P5/408

Foreign References:

JPS60139186A	1985-07-23
JPS58218895A	1983-12-20
JPS58119791A	1983-07-16

Other References: