中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

141 records (took 0.031 seconds)

    Variable frequency power converter for ac motor drive
    41.
    发明授权
    Variable frequency power converter for ac motor drive 失效
    用于交流电机驱动的变频电源转换器

    公开(公告)号：US3939387A

    公开(公告)日：1976-02-17

    申请号：US462534

    申请日：1974-04-19

    Applicant: Takeo Maeda

    Inventor： Takeo Maeda

    IPC: H02M1/14 ,  H02M5/45 ,  H02M7/48 ,  H02P27/06 ,  H02P5/40

    CPC classification number: H02P27/06 ,  H02M1/14 ,  H02M5/4505 ,  H02P2201/03

    Abstract: In a variable frequency power converter of a current type for driving an AC motor including a rectifier, an inverter, and a smoothing reactor disposed on a DC transmission line between the rectifier and the inverter, there are provided a series circuit having a switching circuit and a smoothing capacitor on the DC input side of the inverter and a feedback circuit having controlled rectifier elements and commutation reactors for feeding back the reactive power of the AC motor. The power converter operates as a current type converter until the output frequency of the converter reaches a predetermined value under the condition that the switching circuit and the controlled rectifier elements are non-conductive, and operates as a voltage type converter when the output frequency has reached the predetermined value under the condition that the switching circuit and the controlled rectifier elements are conductive.

    Abstract translation: 在用于驱动包括整流器，逆变器和设置在整流器与逆变器之间的直流传输线上的平滑电抗器的交流电动机的电流型变频电力变换器中，提供一种具有开关电路和 在逆变器的直流输入侧的平滑电容器和具有可控整流元件的反馈电路和用于反馈交流电动机的无功功率的换向电抗器。 电源转换器作为电流型转换器工作，直到转换器的输出频率在开关电路和可控整流元件不导通的条件下达到预定值，并且当输出频率达到时作为电压型转换器工作 在开关电路和可控整流元件导通的条件下的预定值。

    Variable frequency motor drive
    42.
    发明授权
    Variable frequency motor drive 失效
    可变频率电机驱动

    公开(公告)号：US3588650A

    公开(公告)日：1971-06-28

    申请号：US3588650D

    申请日：1969-09-05

    Applicant: CHALCO ENG CORP

    Inventor： BEVIS JEFFREY M

    IPC: H02P27/06 ,  H02P5/40

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

    Abstract: THE SPEED OF AN AC MOTOR CAN BE CONTROLLED BY VARYING THE INPUT FREQUENCY AND VOLTAGE SUPPLIED TO THE MOTOR. THE INVENTION IS CHARACTERIZED BY A SOLID-STATE SWITCH BRIDGE CONNECTED TO THE ELECTRIC MOTOR FOR SUPPLYING GENERALLY SQUARE WAVE VOLTAGE PULSES TO THE MOTOR AT THE DESIRED FREQUENCY. THE SQUARE VOLTAGE PULSES ARE CHOPPED TO ADJUST THE AVERAGE VOLTAGE SUPPLIED TO THE MOTOR TO MAINTAIN THE CONSTANT TORQUE CHARACTERISTIC REQUIRED FOR THE INPUT FREQUENCY TO THE MOTOR. AN RC ATTENUATING CIRCUIT IS CONNECTED TO THE MOTOR IN SUCH A WAY THAT WHEN THE FREQUENCY IS CHANGED THE REGULATED LEVEL OF THE AVERAGE MOTOR VOLTAGE IS AUTOMATICALLY CHANGED TO A VALUE WHICH MAINTAINS THE TORQUE IN THE MOTOR SUBSTANTIALLY CONSTANT.

    Adjustable frequency control system
    43.
    再颁专利
    Adjustable frequency control system 失效

    公开(公告)号：USRE27040E

    公开(公告)日：1971-01-26

    申请号：US27040D

    申请日：1969-02-26

    IPC: H02M5/45 ,  H02P27/06

    CPC classification number: H02P27/06 ,  H02M5/4505 ,  H02P27/047 ,  H02P2201/03

    Abstract: A CONTROL SYSTEM SUPPLIED FROM A THREE-PHASE A.C. POWER SOURCE FOR SUPPLYING ADJUSTABLE FREQUENCY POWER TO CONTROL THE SPEED OF AN A.C. MOTOR AND INCLUDING RECTIFYING AND CONTROLLING APPARATUS FOR PROVIDING AN ADJUSTABLE VOLTAGE D.C. SUPPLY TO AN SCR INVERTER THAT SUPPLIES ADJUSTABLE FREQUENCY POWER TO THE MOTOR AND FEEDS BACK ENERGY TO THE D.C. SUPPLY TO PROVIDE A RESULTANT VOLTAGE CONTROLLED BY MOTOR OPERATION, A FIRING CIRCUIT FOR THE INVERTER, AND MEANS FOR INTEGRATING SUCH RESULTANT VOLTAGE TO CONTROL THE FIRING CIRCUIT AND THE OUTPUT FREQUENCY.

    MOTOR DRIVE APPARATUS
    48.
    发明公开
    MOTOR DRIVE APPARATUS 审中-公开

    公开(公告)号：US20230208337A1

    公开(公告)日：2023-06-29

    申请号：US18170899

    申请日：2023-02-17

    Applicant: Toshiba Carrier Corporation

    Inventor： Kenta Yamamoto ,  Masaki Kanamori ,  Yohei Kubota ,  Keiichi Kato

    IPC: H02P25/22 ,  H02P27/06

    CPC classification number: H02P25/22 ,  H02P27/06 ,  H02P2201/03

    Abstract: According to one embodiment, a motor drive apparatus is an apparatus which drives a motor including a plurality of phase windings in a mutually unconnected state, and includes first and second inverters. The first and second inverters are first and second modules each of which is configured in such a manner that a switching circuit including a positive side terminal and negative side terminals and a drive circuit intended to drive the switching circuit are accommodated in one package, and which possess configurations identical to each other, and the first and second modules are arranged on a circuit board in a state where the negative side terminals of the modules are respectively close to each other.

    MOTOR DRIVE DEVICE INCLUDING RESIDUAL CHARGE CONSUMPTION CONTROL UNIT
    49.
    发明申请
    MOTOR DRIVE DEVICE INCLUDING RESIDUAL CHARGE CONSUMPTION CONTROL UNIT 审中-公开

    公开(公告)号：US20180309402A1

    公开(公告)日：2018-10-25

    申请号：US15951710

    申请日：2018-04-12

    Applicant: Fanuc Corporation

    Inventor： Tomokazu Yoshida

    IPC: H02P27/06 ,  H02M5/458

    CPC classification number: H02P27/06 ,  B60L3/003 ,  B60L2210/30 ,  B60L2210/40 ,  B60L2240/36 ,  H02M5/458 ,  H02M2001/322 ,  H02P2201/03

    Abstract: A motor drive device includes a converter which converts an alternating current into a direct current and outputs the direct current to a DC link, a DC link capacitor, inverters, each of which is provided in correspondence with a motor, converts the direct current in the DC link into an alternating current, and outputs the alternating current to the corresponding motor, a temperature detection unit which detects the temperatures of the motors, an opening and closing unit which opens and closes an electrical path between the AC power supply and the converter, and a residual charge consumption control unit which controls at least one of the inverters to output a reactive current, in accordance with information concerning the motor temperatures detected by the temperature detection unit, when the opening and closing unit opens the electrical path to shut off AC input from the AC power supply to the converter.

    MOTOR DRIVE APPARATUS WITH FUNCTION TO DETECT ABNORMALITY IN POWER DEVICE
    50.
    发明申请
    MOTOR DRIVE APPARATUS WITH FUNCTION TO DETECT ABNORMALITY IN POWER DEVICE 审中-公开

    公开(公告)号：US20180269804A1

    公开(公告)日：2018-09-20

    申请号：US15908860

    申请日：2018-03-01

    Applicant: FANUC CORPORATION

    Inventor： Shinichi MIZUKAMI

    IPC: H02M7/48 ,  H02M1/32 ,  H02P27/00

    CPC classification number: H02M7/4826 ,  H02M1/32 ,  H02M5/293 ,  H02M7/5387 ,  H02M2001/327 ,  H02P3/00 ,  H02P27/00 ,  H02P29/024 ,  H02P2201/03 ,  H02P2203/07

    Abstract: A motor drive apparatus includes: a converter which converts AC power to DC power and to output the DC power to a DC link; an inverter including power devices which converts the DC power to AC power for driving a motor; a capacitor provided in the DC link; a shut-off circuit to open and close an electrical path between the AC power source and the converter; a constant current control unit which performs control in such a manner as to allow a constant current supplied by the capacitor to pass through a detection target power device among the power devices in the inverter; and an abnormality detection unit which detects an abnormality in the detection target power device based on changes in voltage between a collector and an emitter of the detection target power device during a period in which the constant current passes through the detection target power device.

Patent Agency Ranking