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    METHOD OF REDUCING VIBRATIONS IN AN ELECTRIC MOTOR
    2.
    发明公开
    METHOD OF REDUCING VIBRATIONS IN AN ELECTRIC MOTOR 审中-公开

    公开(公告)号：EP4472059A1

    公开(公告)日：2024-12-04

    申请号：EP23176831.8

    申请日：2023-06-01

    Applicant: ABB SCHWEIZ AG

    Inventor： HARNEFORS, Lennart ,  IKRAM UL HAQ, Omer ,  BOSGA, Sjoerd

    IPC: H02P6/10 ,  H02P23/04 ,  H02P23/14

    Abstract: A method of reducing vibrations in an electric motor comprising a rotor and a stator, by means of an active vibration controller, AVC, the method comprising: a) determining whether one of an angular rotational speed of the rotor and an angular stator frequency multiplied by two is within a critical range comprising a mechanical resonance frequency of a motor assembly comprising the electric motor and its load, b) i) setting an oscillating incremental torque angular frequency of the AVC to the angular rotational speed of the rotor if the angular rotational speed of the rotor is within the critical range, or ii) setting the oscillating incremental torque angular frequency to the angular stator frequency multiplied by two if the angular stator frequency multiplied by two is within the critical range, iii) generating an oscillating incremental torque reference using the AVC with the oscillating incremental torque angular frequency set in step b i) or b ii), and iv) controlling the electric motor based on a sum of the oscillating incremental torque reference and an electrical torque reference; or c) i) deactivating the AVC if the angular rotational speed of the rotor and the angular stator frequency multiplied by two is outside the critical range, and ii) controlling the electric motor based on the electrical torque reference.

    POWER CONVERSION DEVICE
    6.
    发明公开
    POWER CONVERSION DEVICE 审中-实审

    公开(公告)号：EP4366152A1

    公开(公告)日：2024-05-08

    申请号：EP21948484.7

    申请日：2021-11-10

    Applicant: Hitachi Industrial Equipment Systems Co., Ltd.

    Inventor： TOBARI, Kazuaki ,  OHASHI, Hironori ,  WATANABE, Hiroshi ,  OHYA, Masato

    IPC: H02P6/10 ,  H02P21/26

    CPC classification number: H02P21/26 ,  H02P6/10

    Abstract: A power converter apparatus comprising: a power converter that outputs signal to the magnet motor to vary the output frequency, output voltage and output current of the magnet motor, a control unit controls the power converter, wherein the control unit calculating the gain of the magnetic flux component of the q-axis, which varies with the phase of the magnet motor, calculating the d-axis induced voltage command value based on a value of the induced voltage coefficient, frequency estimates or frequency command value, and the gain of the flux component of the q-axis.

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