OPERATION SYSTEM OF THREE-PHASE WOUND-ROTOR INDUCTION MOTOR

PURPOSE:To maintain normal speed control and power control by passing predetermined zero-phase current even under one phase missing state thereby supplying three-phase balanced current and voltage to a rotor winding. CONSTITUTION:Upon a fault of a phase-c reversible converter 30c, switches 7a, 7e ar...

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Hauptverfasser: MOTOYOSHI OSAMU, YAMAMOTO MITSUTOSHI
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creator MOTOYOSHI OSAMU
YAMAMOTO MITSUTOSHI
description PURPOSE:To maintain normal speed control and power control by passing predetermined zero-phase current even under one phase missing state thereby supplying three-phase balanced current and voltage to a rotor winding. CONSTITUTION:Upon a fault of a phase-c reversible converter 30c, switches 7a, 7e are opened while switches 7d, 7h are closed. Then cos(thetas+2pi/3) and sin(thetas+2pi/3) are inputted to multipliers 5a, 5b and multiplication of a current command id2* and cos(thetas+2pi/3) and that of iq2* and sin(thetas+2pi/3) are carried out. As for id2*.cos(thetas+2pi/3 the sign is inverted through a sign inverter 6 while operation of -id2*.cos(thetas+2pi/3)+iq2*.sin(thetaS+2pi/3) is carried out through an adder 1c. Thereafter, the difference between -id2*.cos(thetas+2pi/3)+iq2*.sin(thetaS +2pi/3) as a zero-phase current command and an actual i02 is operated in an adder 1d. Then the difference is added to respective phase outputs from a two- phase/three-phase converter 4 in adders 1e, 1f, 1g through a zero-phase current regulator 2c thus producing voltage commands for phases a, b and c.
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CONSTITUTION:Upon a fault of a phase-c reversible converter 30c, switches 7a, 7e are opened while switches 7d, 7h are closed. Then cos(thetas+2pi/3) and sin(thetas+2pi/3) are inputted to multipliers 5a, 5b and multiplication of a current command id2* and cos(thetas+2pi/3) and that of iq2* and sin(thetas+2pi/3) are carried out. As for id2*.cos(thetas+2pi/3 the sign is inverted through a sign inverter 6 while operation of -id2*.cos(thetas+2pi/3)+iq2*.sin(thetaS+2pi/3) is carried out through an adder 1c. Thereafter, the difference between -id2*.cos(thetas+2pi/3)+iq2*.sin(thetaS +2pi/3) as a zero-phase current command and an actual i02 is operated in an adder 1d. Then the difference is added to respective phase outputs from a two- phase/three-phase converter 4 in adders 1e, 1f, 1g through a zero-phase current regulator 2c thus producing voltage commands for phases a, b and c.</description><language>eng</language><subject>CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS ; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ; ELECTRICITY ; GENERATION</subject><creationdate>1990</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19900524&amp;DB=EPODOC&amp;CC=JP&amp;NR=H02136096A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25543,76293</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19900524&amp;DB=EPODOC&amp;CC=JP&amp;NR=H02136096A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>MOTOYOSHI OSAMU</creatorcontrib><creatorcontrib>YAMAMOTO MITSUTOSHI</creatorcontrib><title>OPERATION SYSTEM OF THREE-PHASE WOUND-ROTOR INDUCTION MOTOR</title><description>PURPOSE:To maintain normal speed control and power control by passing predetermined zero-phase current even under one phase missing state thereby supplying three-phase balanced current and voltage to a rotor winding. 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CONSTITUTION:Upon a fault of a phase-c reversible converter 30c, switches 7a, 7e are opened while switches 7d, 7h are closed. Then cos(thetas+2pi/3) and sin(thetas+2pi/3) are inputted to multipliers 5a, 5b and multiplication of a current command id2* and cos(thetas+2pi/3) and that of iq2* and sin(thetas+2pi/3) are carried out. As for id2*.cos(thetas+2pi/3 the sign is inverted through a sign inverter 6 while operation of -id2*.cos(thetas+2pi/3)+iq2*.sin(thetaS+2pi/3) is carried out through an adder 1c. Thereafter, the difference between -id2*.cos(thetas+2pi/3)+iq2*.sin(thetaS +2pi/3) as a zero-phase current command and an actual i02 is operated in an adder 1d. Then the difference is added to respective phase outputs from a two- phase/three-phase converter 4 in adders 1e, 1f, 1g through a zero-phase current regulator 2c thus producing voltage commands for phases a, b and c.</abstract><oa>free_for_read</oa></addata></record>
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subjects CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS
CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
title OPERATION SYSTEM OF THREE-PHASE WOUND-ROTOR INDUCTION MOTOR
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