-
公开(公告)号：US11575338B2
公开(公告)日：2023-02-07
申请号：US17422509
申请日：2020-04-28
发明人： Kazuaki Tobari , Agnes Hadinata , Atsuhiko Nakamura , Hiroshi Watanabe , Yusaku Onuma , Takuya Sugimoto , Yoshiyuki Taguchi
IPC分类号： H02P27/08
摘要： This power conversion device comprises: a power converter including a switching element; and a control unit which controls the power converter. The control unit calculates a torque electric current detection value and an excitation electric current detection value from an electric current flowing to an external device, and when an absolute value of the torque electric current detection value is greater than or equal to the excitation electric current detection value, performs control such that the excitation electric current detection value follows the torque electric current detection value.
-
公开(公告)号：US11424707B2
公开(公告)日：2022-08-23
申请号：US17049979
申请日：2018-12-26
发明人： Kazuaki Tobari , Yoshitaka Iwaji , Agnes Hadinata , Yusaku Onuma , Atsuhiko Nakamura , Takuya Sugimoto
摘要： A power conversion apparatus controls a load apparatus by position sensorless vector control. The power conversion apparatus includes: a current detection unit configured to detect a current passing through the load apparatus; a current detection arithmetic unit configured to calculate a harmonic current component on a dc-axis as a control axis and a harmonic current component on a qc-axis, based on the detected current; a saliency ratio estimation unit configured to output a saliency ratio estimated value based on the harmonic current component on the dc-axis and the harmonic current component on the qc-axis; and a saliency ratio control unit configured to output a current component that increases or decreases a current command value on a d-axis of a rotor coordinate system, based on a deviation between the saliency ratio estimated value and a predetermined saliency ratio.
-
公开(公告)号：US11437944B2
公开(公告)日：2022-09-06
申请号：US17254686
申请日：2019-05-29
发明人： Kazuaki Tobari , Yoshitaka Iwaji , Agnes Hadinata , Yusaku Onuma , Takuya Sugimoto , Atsuhiko Nakamura , Hiroshi Watanabe , Yoshiyuki Taguchi
摘要： A power conversion device includes a harmonic voltage generation unit that superimposes dc-axis and qc-axis harmonic voltages on dc-axis and qc-axis voltage commands in accordance with a switching signal; and an inductance estimation unit that estimates dc-axis inductance and qc-axis inductance on a basis of dc-axis and qc-axis harmonic currents, amplitude values of the harmonic voltages, and the switching signal.
-
公开(公告)号：US11273712B2
公开(公告)日：2022-03-15
申请号：US16479852
申请日：2018-02-13
发明人： Yoshitaka Iwaji , Kazuaki Tobari , Yuuta Iwase , Yusaku Onuma
IPC分类号： H02P21/16 , H02P29/024 , B60L3/00 , H02P21/22 , H02P27/08 , B60L15/20 , H02M7/5387
摘要： Provided is an AC electric motor control device capable of detecting, in an AC electric motor drive device, abnormal operation of an AC electric motor or abnormal operation due to, for example, a sudden change of a load without an erroneous operation regardless of the operational state of the AC electric motor. When driving a three-phase AC electric motor by an inverter, inside a controller, an electric motor constant is calculated using at least one of the current, voltage, and rotational speed of the electric motor and the variation of the constant value is analyzed, thereby detecting abnormal operation of the electric motor or abnormal operation of a load device connected to the electric motor. In order to analyze the constant, a variation to be determined to be abnormal is preset or an abnormal value is calculated in comparison with the accumulated values of past constant changes. Alternatively, only the variation of the constant calculated in the controller is extracted to detect abnormality.
-
公开(公告)号：US10903767B2
公开(公告)日：2021-01-26
申请号：US16483813
申请日：2018-03-02
发明人： Agnes Hadinata , Yoshitaka Iwaji , Kazuaki Tobari , Yusaku Onuma , Takuya Sugimoto , Masato Ohya
IPC分类号： H02P6/18
摘要： According to the present invention, in position sensorless control for switching between a 120-degree energization scheme for a low-speed region and a 180-degree energization scheme for a mid-to-high-speed region, stable and highly accurate speed control characteristics are provided by suppressing speed deviation Δωr in the low-speed region, and by preventing current jump-up caused by a discontinuous rotational speed occurring during switching to the mid-to-high-speed region. In the case of driving in the 120-degree energization scheme, a voltage command value is corrected such that an estimated speed value or a detected speed value follows a speed command.
-
-
-
-
搜索结果
5 条记录 (耗时 0.021 秒)