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Apparatus and method for controlling inverter for driving a three-phase motor

A technology of three-phase motors and control methods, which is applied in the direction of controlling electromechanical transmission devices, controlling generators, controlling electromechanical brakes, etc., and can solve problems such as complex algorithms

Active Publication Date: 2005-02-02
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0025] -However, in this conventional technique, the algorithm for determining the vector area, calculating the switching continuation time of adjacent voltage vectors, and setting the graph of each area to calculate the switching continuation time is complicated

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  • Apparatus and method for controlling inverter for driving a three-phase motor
  • Apparatus and method for controlling inverter for driving a three-phase motor
  • Apparatus and method for controlling inverter for driving a three-phase motor

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Embodiment Construction

[0056] Specific embodiments of the present invention will now be described in detail with reference to the examples shown in the drawings, wherein like reference numerals refer to like parts throughout. The aspects described below are to explain the present invention by referring to the figures.

[0057] Such as Figure 4 As shown in , the inverter control device includes an inverter 1 , a three-phase motor 2 , a vector area determination part 3 , a line voltage comparison signal generation part 4 and an inverter control part 5 .

[0058] refer to Figure 5 , the inverter 1 has three first switches (Sup, Svp and Swp) and three second switches (Sun, Svn and Swn). The first switch is connected between each phase terminal (u phase, v phase and w phase) of the three-phase motor 2 and the positive terminal of the DC power supply, while the second switch is connected between each phase terminal (u phase) of the three-phase motor 2 phase, v-phase and w-phase) and the negative term...

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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.

Description

technical field [0001] The present invention relates to a control device and method for an inverter for driving a three-phase motor. Background technique [0002] Three-phase motors with inverters are commonly used in household appliances in consideration of energy efficiency, such as air conditioners, washing machines, refrigerators, and the like. Most of such inverters use a PWM (Pulse Width Modulation) method, specifically an SVM (or SVPWM, Space Voltage Vector Pulse Width Modulation) method. The SVM method is known to maximize the amount of available DC (direct current) voltage connected to the inverter. In addition, compared with the generally widely used triangular PWM, the SVM method can significantly reduce the current harmonic component under normal conditions. See "Analysis and Realization of a Pulse Width Modulation on VoltageSpace Vector" by H.W Van der Broeck and H.C Skydelny, IEEE Trans, April 1998 (Chapter IA -24, Issue 1, pp. 142-150), and "Analysis of PWM...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02P21/00H02P23/07H02P27/08
CPCH02M7/53871H02P21/00
Inventor 廉长玹
Owner SAMSUNG ELECTRONICS CO LTD