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    Inverter circuit
    71.
    发明授权
    Inverter circuit 失效
    逆变电路

    公开(公告)号：US4158163A

    公开(公告)日：1979-06-12

    申请号：US843408

    申请日：1977-10-19

    Applicant: Henry R. Eriksen ,  Hans M. Beierholm

    Inventor： Henry R. Eriksen ,  Hans M. Beierholm

    IPC: H02P20060101 ,  H02P27/06 ,  H02P5/34

    CPC classification number: H02P27/06 ,  H02P2201/03 ,  H02P27/047

    Abstract: The invention relates to an inverter circuit for operating an asynchronous motor having an adjustable speed. The inverter has its output frequency regulatable by a frequency regulator and the D.C. supply has its voltage regulatable by a voltage regulator. There is a desired value frequency regulator having a signal (f) and voltage and current measuring devices having output signals (E) and (I). A control circuit processes these signals (f, E, I) to form input values for the referred to voltage and frequency regulators. The control circuit includes a computer circuit which, from at least two output values and at least one constant, calculates a computed value of the third output value which, together with the first-mentioned output values, given by way of computation a substantially constant slip frequency for a given desired value, and this computed value is compared with a value substantially corresponding to the actual third output value. The three output values are interlinked in the computer circuit in such a way that a constant slip frequency is obtained for the desired frequency value that is fed in. The D.C. voltage supplied to the inverter is regulated so that this condition is maintained independently of the load. The result of this is that the nominal slip for a nominal load also occurs on partial load and this leads to the desired constant speed. This slip frequency can be kept constant even at low loads in that the air gap magnetization is made substantially proportional to the rotor current, i.e. there is under-magnetization.

    Abstract translation: 本发明涉及一种用于操作具有可调速度的异步电动机的逆变器电路。 变频器的输出频率由频率调节器调节，直流电源的电压由电压调节器调节。 存在具有信号（f）和具有输出信号（E）和（I））的电压和电流测量装置的期望值频率调节器。 控制电路处理这些信号（f，E，I）以形成所谓的电压和频率调节器的输入值。 控制电路包括一个计算机电路，该电路从至少两个输出值和至少一个常数计算第三输出值的计算值，连同前面提到的输出值一起，通过计算给出基本上恒定的滑差 频率，并将该计算值与基本上对应于实际第三输出值的值进行比较。 三个输出值在计算机电路中互相连接，使得为所馈送的期望频率值获得恒定的转差频率。调节提供给逆变器的直流电压，使得该条件与负载无关地维持 。 其结果是额定负载的额定电流也发生在部分负载上，这导致所需的恒定速度。 即使在低负载下，该滑差频率也可保持恒定，因为气隙磁化与转子电流基本成比例，即存在欠磁化。

    Control circuit for an inverter with a variable output voltage and frequency
    72.
    发明授权
    Control circuit for an inverter with a variable output voltage and frequency 失效
    具有可变输出电压和频率的逆变器的控制电路

    公开(公告)号：US3848176A

    公开(公告)日：1974-11-12

    申请号：US34452873

    申请日：1973-03-26

    Applicant: ETTER M

    Inventor： ETTER M

    IPC: H02M7/525 ,  H02P27/04 ,  H02P27/06 ,  H02M7/52

    CPC classification number: H02P27/06 ,  H02M7/525 ,  H02P27/04 ,  H02P27/047 ,  H02P2201/03

    Abstract: An inverter with a variable output voltage and frequency, intended to supply an a.c. motor or a similar load, in which the variation of amplitude of the output voltage is provided by a chopper supplying the inverter with pulses of variable width or by switching of the inverter itself, is controlled by an electronic circuit in which the voltage supplied by the chopper or the rectified output voltage of the inverter is integrated to give an image of the instantaneous variation of the flux induced in the motor. The output voltage of the inverter is cancelled or reduced each time that the integrated signal reaches a maximum value corresponding to a desired variation of said flux, and the integrated signal is then set to zero. The chopper or the inverter is periodically reset to the minimal switching frequency of the inverter to obtain the desired output frequency or to a whole number multiple of said minimal frequency, means being provided for automatically modifying said multiple when the frequency of the chopper or of the inverter is too small or too large and for making the maximum value of the integrated signal correspond to a variation of flux equal to that obtained at said minimal frequency divided by the said chosen multiple.

    Abstract translation: 具有可变输出电压和频率的变频器，用于提供一个等 电动机或类似的负载，其中输出电压的振幅的变化由为逆变器提供可变宽度的脉冲或通过变换器本身的切换提供的斩波器提供，由电子电路控制，其中由 斩波器或整流的逆变器的输出电压被积分，以给出电动机感应通量的瞬时变化的图像。 每当积分信号达到对应于所述通量的期望变化的最大值时，逆变器的输出电压被消除或减小，然后将积分信号设置为零。 斩波器或逆变器周期性地复位到逆变器的最小开关频率以获得期望的输出频率或所述最小频率的整数倍，提供用于当斩波器的频率或 逆变器太小或太大，并且用于使积分信号的最大值对应于与所述最小频率除以所选择的倍数获得的通量的变化量相等。

    Motor control circuit and three-phase generator with stationary components
    73.
    发明授权
    Motor control circuit and three-phase generator with stationary components 失效
    具有静态元件的电机控制电路和三相发电机

    公开(公告)号：US3767988A

    公开(公告)日：1973-10-23

    申请号：US3767988D

    申请日：1970-12-03

    Applicant: DANFOSS AS

    Inventor： JENSEN A

    IPC: H02M7/48 ,  H02P27/06 ,  H02P5/28

    CPC classification number: H02P27/06 ,  H02M7/48 ,  H02P27/047 ,  H02P2201/03

    Abstract: An electrical three-phase generator and motor control circuit. The generator is made of three alike wave-generating units in cascade each generating a respective trapezoidal wave corresponding to a respective phase of the generator. Each unit comprises a small detector in series with a control circuit varying the amplitude of the wave proportionately to a control voltage representative of and corresponding to variations of voltage from voltage sources and applied to a motor and an integrating circuit consisting of an integrating amplifier and an integrating capacitor and a double limiter in parallel therewith. The control voltage is developed by a voltage divider across the motor control circuit.

    Abstract translation: 电气三相发电机和电机控制电路。 发电机由级联的三个相同的波形发生单元制成，每个产生相应于发电机的相位的相应的梯形波。 每个单元包括与控制电路串联的小型检测器，该控制电路将波形的幅度成比例地变换成表示并对应于来自电压源的电压的变化并施加到电动机的控制电压，以及由积分放大器和 积分电容器和双限幅器并联。 控制电压由电机控制电路上的分压器开发。

    Variable speed drive control
    75.
    发明授权
    Variable speed drive control 有权

    公开(公告)号：US11843338B2

    公开(公告)日：2023-12-12

    申请号：US17837309

    申请日：2022-06-10

    Applicant: Schneider Toshiba Inverter Europe SAS

    Inventor： Mohamad Koteich ,  Thomas Devos

    IPC: H02P27/08 ,  H02P23/12

    CPC classification number: H02P27/085 ,  H02P23/12 ,  H02P2201/03

    Abstract: Examples include a method for controlling a variable speed drive driving an electric motor. The variable speed drive is connected to an electric power source and comprises a passive DC-link and an inverter stage controlled by a first controller of the variable speed drive. The passive DC-link is connected to the inverter stage. The method comprises running the electric motor to reach a steady-state operating point, measuring a plurality of values of current or voltage of the passive DC-link, and computing, by a second controller, a frequency spectrum of the DC-link based on the plurality of values of current or voltage measured. The method further comprises detecting a specific resonance frequency by comparing amplitudes of the frequency spectrum to a predetermined pattern, and modifying filter parameters of a digital filter of the DC-link or control parameters of a control law of the electric motor based on the specific resonance frequency.

    POWER CONVERTER CONTROL DEVICE
    77.
    发明申请
    POWER CONVERTER CONTROL DEVICE 审中-公开

    公开(公告)号：US20180367080A1

    公开(公告)日：2018-12-20

    申请号：US16061608

    申请日：2016-11-10

    Applicant: DAIKIN INDUSTRIES, LTD.

    Inventor： Shinichi ISHIZEKI ,  Nobuyasu HIRAOKA

    IPC: H02P27/06 ,  H02M5/458

    CPC classification number: H02P27/06 ,  H02M3/1582 ,  H02M5/458 ,  H02M5/4585 ,  H02M7/06 ,  H02M7/48 ,  H02M7/797 ,  H02M2001/007 ,  H02P2201/03 ,  H02P2201/07 ,  H02P2201/09

    Abstract: A discharge switch and a capacitor are connected in series between first and second DC power supply lines. A boost circuit boosts a rectified voltage to charge the capacitor. An inverter receives the rectified voltage as a DC voltage when the discharge switch is not conducting, receives a voltage across the capacitor as the DC voltage when the discharge switch is conducting, converts the DC voltage into an AC voltage, and outputs it to a motor. A switch control unit maintains the discharge switch not conducting over a first time period, and switches the discharge switch between conducting and not conducting in a second time period. A charge and discharge time period setting unit sets the first time period when a rotational speed of the motor is higher than a speed threshold shorter than the first time period when the rotational speed is lower than the speed threshold.

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