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公开(公告)号：US11870384B2
公开(公告)日：2024-01-09
申请号：US16644207
申请日：2018-06-13
发明人： Hiroshi Watanabe , Masataka Sasaki , Masahiro Hiraga , Yusuke Arao , Atsuhiko Nakamura , Hiroyuki Tomita , Kazushige Hotta , Yusaku Onuma
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%.
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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.
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公开(公告)号：US20130342136A1
公开(公告)日：2013-12-26
申请号：US14014584
申请日：2013-08-30
IPC分类号： H02P3/22
摘要： The performance of a power transducer is improved while efficiently using a power semiconductor also by managing the permissible duty factor of the power semiconductor in the regenerative braking circuit provided in the power transducer. The user is allowed to set, through an operation panel provided on the power transducer, the resistance value of the regenerative braking resistor for thermally consuming the rotational energy generated during motor deceleration. The power transducer performs the steps of: calculating the current which flows in the regenerative braking circuit from the resistance value setting; obtaining the generation loss of the power semiconductor in the regenerative braking circuit with the calculated current value; and determining the permissible duty factor of the power semiconductor from the obtained generation loss.
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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.
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公开(公告)号：US20130127382A1
公开(公告)日：2013-05-23
申请号：US13747574
申请日：2013-01-23
IPC分类号： H02P3/22
摘要： The performance of a power transducer is improved while efficiently using a power semiconductor also by managing the permissible duty factor of the power semiconductor in the regenerative braking circuit provided in the power transducer. The user is allowed to set, through an operation panel provided on the power transducer, the resistance value of the regenerative braking resistor for thermally consuming the rotational energy generated during motor deceleration. The power transducer performs the steps of: calculating the current which flows in the regenerative braking circuit from the resistance value setting; obtaining the generation loss of the power semiconductor in the regenerative braking circuit with the calculated current value; and determining the permissible duty factor of the power semiconductor from the obtained generation loss.
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