Apparatus and method for controlling inverter for driving a three-phase motor
First Claim
1. An inverter control method for a three-phase motor comprising three first switches connected between each of phase terminals of the three-phase motor and a positive terminal of a DC power of the three-phase motor, and three second switches connected between each of the phases and a negative terminal of the DC power of the three-phase motor, comprising:
- disposing three maximum phase voltage vectors each having an equivalent angle interval corresponding to maximum values of each phase voltage;
setting maximum phase voltage vector regions by predetermined angles with respect to each of the maximum phase voltage vectors;
setting minimum phase voltage vectors corresponding to the maximum phase voltage vectors in between the maximum phase voltage vector regions;
obtaining a desirable voltage by turning on a first switch and turning off a second switch, both connected to the phase terminal of a corresponding maximum phase voltage in each maximum phase voltage vector region; and
changing a duty ratio of control signals with respect to the other switches corresponding to the other two phase voltages.
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Accused Products
Abstract
An inverter control apparatus and method of a three-phase motor includes disposing three maximum phase voltage vectors each having an equivalent angle interval corresponding to maximum values of each phase voltage; setting maximum phase voltage vector regions by predetermined angles with respect to each of the maximum phase voltage vectors; setting minimum phase voltage vectors corresponding to the maximum phase voltage vectors in between the maximum phase voltage vector regions; obtaining a desirable voltage by turning on a first switch and turning off a second switch, both connected to the phase terminal of a corresponding maximum phase voltage in each maximum phase voltage vector region; and changing a duty ratio of control signals with respect to other two switches corresponding to the other two phase voltages.
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Citations
16 Claims
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1. An inverter control method for a three-phase motor comprising three first switches connected between each of phase terminals of the three-phase motor and a positive terminal of a DC power of the three-phase motor, and three second switches connected between each of the phases and a negative terminal of the DC power of the three-phase motor, comprising:
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disposing three maximum phase voltage vectors each having an equivalent angle interval corresponding to maximum values of each phase voltage;
setting maximum phase voltage vector regions by predetermined angles with respect to each of the maximum phase voltage vectors;
setting minimum phase voltage vectors corresponding to the maximum phase voltage vectors in between the maximum phase voltage vector regions;
obtaining a desirable voltage by turning on a first switch and turning off a second switch, both connected to the phase terminal of a corresponding maximum phase voltage in each maximum phase voltage vector region; and
changing a duty ratio of control signals with respect to the other switches corresponding to the other two phase voltages. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A controlling apparatus of an inverter for a three-phase motor comprising three first switches connected between each phase terminal of the three-phase motor and a positive terminal of a DC power of the three-phase motor, and three second switches connected between each of the phases and a negative terminal of the DC power, comprising:
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a vector region determination part receiving a phase voltage of the each phase terminal as an input and calculating a vector region parameter using a logical calculation using a sign function returning 1 when a received phase voltage has a positive value and returning 0 when the received phase voltage has a negative value, the logical calculation comprising;
region1=sign (Vuo)&
˜
sign (Vvo)&
˜
sign (Vwo)
region2=sign (Vuo)&
sign (Vvo)&
˜
sign (Vwo)
region3=˜
sign (Vuo)&
sign (Vvo)&
˜
sign (Vwo)
region4=˜
sign (Vuo)&
sign (Vvo)&
sign (Vwo)
region5=˜
sign (Vuo)&
˜
sign (Vvo)&
sign (Vwo)
region6=sign (Vuo)&
˜
sign (Vvo)&
sign (Vwo)wherein, region1, region2, region3, region4, region5, and region6 are the vector region parameters indicating the phase voltage vector regions, and Vuo, Vvo, and Vwo indicate the phase voltage of a u-phase voltage, a v-phase voltage, and a w-phase voltage of the motor, respectively;
a line voltage comparative generation part receiving the phase voltage as an input and calculating a line voltage comparative signal using a duty ratio calculated based on a ratio of line voltages between each of the phase voltages to the DC power; and
an inverter control part calculating first control signals of the first switch of the inverter using a following logical calculation, and generating speed control signals of the second switch having a phase difference in 180 degrees with the first control signal
Su=region1+Swu&
(region2+region5)+Suv&
(region3+region6)
Sv=region3+Suv&
(region1+region4)+Suw&
(region2+region5)
Sw=region5+Swu&
(region3+region6)+Suv&
(region1+region4)wherein, Su, Sv, and Sw indicate the first control signal, and Suv, Svw, and Swu indicate the line voltage comparative signal, respectively, corresponding to each of the line voltages.
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Specification