专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US12088228B2 Power conversion device and control method thereof 有权
公开(公告)号：US12088228B2
公开(公告)日：2024-09-10
申请号：US17911175
申请日：2020-05-08
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： Yusaku Onuma , Takuya Sugimoto
IPC分类号： H02P27/08 , H02M7/537
CPC分类号： H02P27/085 , H02M7/537
摘要： The purpose of the present invention is to provide a power conversion device capable of suppressing an increase in current flowing through a motor even if a voltage command exceeds the amplitude of a carrier wave. To achieve the above purpose, a power conversion device, which controls the drive of a three-phase motor by converting a DC voltage into a voltage command-based voltage through the operation of a switching circuit, comprises: a DC voltage detector which detects a DC voltage; a norm generator which generates a voltage command norm from the voltage command; a modulated wave generator which generates a first modulated wave from the detected DC voltage and the voltage command norm; and a control signal generator which generates a control signal for controlling the operation of the switching circuit from the first modulated wave and the carrier wave, wherein the modulated wave generator generates, for one phase at the timing of the maximum or minimum value of the voltage command, a first modulated wave having a magnitude of ½ of the detected DC voltage, and generates, for the remaining two phases, a first modulated wave having a magnitude based on the detected DC voltage and voltage command norm.

2. 发明授权

US11575338B2 Power conversion device 有权
公开(公告)号：US11575338B2
公开(公告)日：2023-02-07
申请号：US17422509
申请日：2020-04-28
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
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.

3. 发明授权

US11909341B2 Power conversion device and method for controlling same 有权
公开(公告)号：US11909341B2
公开(公告)日：2024-02-20
申请号：US17601450
申请日：2019-04-12
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： Yusaku Onuma , Takuya Sugimoto
IPC分类号： H02P27/08 , H02M1/08 , H02M7/539
CPC分类号： H02P27/08 , H02M1/083 , H02M7/539 , H02P2209/05
摘要： An object of the present invention is to provide a power conversion device capable of suppressing an increase in a current flowing through a motor even if a voltage command exceeds the amplitude of a carrier wave. In order to achieve the above object, the power conversion device controls the driving of a motor by converting a DC voltage into a voltage based on a voltage command by an operation of a switching circuit and includes: a modulated wave generator that generates a first modulated wave from the voltage command; and a control signal generator that generates a control signal for controlling the operation of the switching circuit from the first modulated wave and a carrier wave. The modulated wave generator generates a square wave based on a voltage command norm as the first modulated wave.

4. 发明授权

US11424707B2 Power conversion apparatus 有权
公开(公告)号：US11424707B2
公开(公告)日：2022-08-23
申请号：US17049979
申请日：2018-12-26
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： Kazuaki Tobari , Yoshitaka Iwaji , Agnes Hadinata , Yusaku Onuma , Atsuhiko Nakamura , Takuya Sugimoto
IPC分类号： H02P21/22 , H02P21/16 , H02P21/18 , H02M1/00
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.

5. 发明授权

US11870384B2 Speed calculation device and power conversion device 有权
公开(公告)号：US11870384B2
公开(公告)日：2024-01-09
申请号：US16644207
申请日：2018-06-13
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： Hiroshi Watanabe , Masataka Sasaki , Masahiro Hiraga , Yusuke Arao , Atsuhiko Nakamura , Hiroyuki Tomita , Kazushige Hotta , Yusaku Onuma
IPC分类号： H02H3/44 , H02P1/18 , H02P6/17
CPC分类号： H02P6/17
摘要： The purpose of the present invention is to provide a speed detection method for maintaining a fine time axis resolution and a power conversion device that uses the method. This power conversion device comprises an inverter for converting DC voltage into AC voltage and supplying the same to a motor, a motor speed calculation unit for calculating the speed of the motor from output pulses obtained from an encoder connected to the motor, and a control unit for receiving the motor speed from the motor speed calculation unit and controlling the inverter. In the power conversion device, the motor speed calculation unit measures the duty cycle of the output pulses, calculates the speed using the half cycles of the output pulses if the duty cycle is within a prescribed range from 50%, and calculates the speed using the full cycles of the output pulses if the duty ratio is outside of the prescribed range from 50%.

6. 发明授权

US11437944B2 Power conversion device 有权
公开(公告)号：US11437944B2
公开(公告)日：2022-09-06
申请号：US17254686
申请日：2019-05-29
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： Kazuaki Tobari , Yoshitaka Iwaji , Agnes Hadinata , Yusaku Onuma , Takuya Sugimoto , Atsuhiko Nakamura , Hiroshi Watanabe , Yoshiyuki Taguchi
IPC分类号： H02P21/18 , H02P21/16 , H02P21/22 , H02P21/24 , H02M7/48 , H02P23/14
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.

7. 发明授权

US11273712B2 AC electric motor control device 有权
公开(公告)号：US11273712B2
公开(公告)日：2022-03-15
申请号：US16479852
申请日：2018-02-13
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
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.

8. 发明授权

US10903767B2 Synchronous motor control apparatus 有权
公开(公告)号：US10903767B2
公开(公告)日：2021-01-26
申请号：US16483813
申请日：2018-03-02
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
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.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式