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    • 4. 发明授权
    • Inverter apparatus for preventing an overincrease of output frequency
    • 用于防止输出频率过度升高的逆变器装置
    • US5177678A
    • 1993-01-05
    • US701033
    • 1991-05-16
    • Satoshi IboriNoritoshi TuziYasumasa ToudouHiroshi FujiiTakatsugu Kambara
    • Satoshi IboriNoritoshi TuziYasumasa ToudouHiroshi FujiiTakatsugu Kambara
    • H02M7/48H02P27/06
    • H02M7/53873
    • An inverter apparatus using a microcomputer control system suitable for use in driving an ac rotary electric machine is concerned. The inverter apparatus includes a device for detecting an output current or an output voltage of the inverter apparatus or a control signal supplied to the inverter apparatus and, from the detected result, detecting an output frequency of the inverter apparatus and a switch structure having memory function by means of change-over and selection of lines for holding data for setting therein an upper limit of the output frequency of the inverter apparatus in hardware manner. Thus, the device for detecting the output frequency of the inverter apparatus produces the output frequency of the inverter apparatus and the switch structure produces the exact upper limit of the output frequency which is not influenced by noise or the like. The comparison therebetween can suppress the output frequency of the inverter apparatus to the upper limit always reliably without permanent change due to noise or the like and a fear of changing data so that occurrence of over-rotational speed operation of the driven ac rotary electric machine can be prevented sufficiently.
    • 涉及一种使用适用于驱动交流旋转电机的微计算机控制系统的逆变器装置。 逆变器装置包括用于检测逆变器装置的输出电流或输出电压或提供给逆变器装置的控制信号的装置,并且从检测结果检测逆变器装置的输出频率和具有存储功能的开关结构 通过切换和选择用于保持数据的线,以硬件方式设置逆变器装置的输出频率的上限。 因此,用于检测逆变器装置的输出频率的装置产生逆变器装置的输出频率,并且开关结构产生不受噪声等影响的输出频率的精确上限。 其之间的比较可以将逆变器装置的输出频率总是可靠地抑制到上限,而不会由于噪声等而导致永久性变化,并且担心数据变化,从而使从动交流旋转电机的过转速运行的发生可以 充分防止。
    • 10. 发明授权
    • Control system for PWM inverter
    • PWM逆变器控制系统
    • US4767976A
    • 1988-08-30
    • US37853
    • 1987-04-13
    • Nobuyoshi MutohAkiteru UedaMotonobu HattoriSatoshi IboriHideyuki ShimonabeKenji Nandoh
    • Nobuyoshi MutohAkiteru UedaMotonobu HattoriSatoshi IboriHideyuki ShimonabeKenji Nandoh
    • H02P27/06H02P21/08H02P27/04H02P27/08H02P5/40
    • H02P27/08H02P27/047
    • A control system for controlling a PWM inverter so that the inverter drives an induction motor at a variable voltage and a variable frequency while keeping constant a ratio of the output voltage of the inverter to the output frequency thereof, is disclosed which includes current component detecting means for detecting an effective current corresponding to a load, from the input current of the induction motor, frequency setting means for setting the output frequency of the PWM inverter, flux setting means for setting the amount of magnetic flux generated in the induction motor, correcting-frequency calculating means for calculating a frequency correcting quantity proportional to the effective current, and correcting-flux calculating means for calculating a flux correcting quantity proportional to the effective current. In a case where the detected effective current is judged to be less than a predetermined value, the frequency correcting quantity is added to the set output frequency to obtain an output frequency command, and the sum of the flux correcting quantity and the set amount of magnetic flux is multiplied by the value of the output frequency command to obtain an output voltage command, for the purpose of controlling the operation of the PWM inverter on the basis of the output frequency command and the output voltage command.
    • 一种用于控制PWM逆变器的控制系统,使得逆变器以可变电压和可变频率驱动感应电动机,同时保持变频器的输出电压与其输出频率的比例恒定,其包括电流分量检测装置 用于从感应电动机的输入电流检测与负载相对应的有效电流;频率设定装置,用于设定PWM逆变器的输出频率;磁通设定装置,用于设定感应电动机中产生的磁通量, 频率计算装置,用于计算与有效电流成比例的频率校正量;以及校正磁通计算装置,用于计算与有效电流成比例的磁通校正量。 在检测到的有效电流被判断为小于预定值的情况下,将频率校正量与设定的输出频率相加,得到输出频率指令,并且磁通校正量与设定的磁场量之和 为了根据输出频率指令和输出电压指令来控制PWM逆变器的运行,磁通量乘以输出频率指令的值以获得输出电压指令。