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公开(公告)号：US20170298924A1
公开(公告)日：2017-10-19
申请号：US14900010
申请日：2014-06-27
Applicant: EATON CORPORATION
Inventor： Yilun CHEN , Xiaomeng CHENG
CPC classification number: F04B49/06 , F04B17/03 , F04B49/065 , F04B49/08 , F04B49/103 , F04B49/20 , F04B2201/1208 , F04B2203/0201 , F04B2203/0209 , F04B2205/05 , F04B2205/13 , F04C14/08 , F04C15/008 , F04C2270/095
Abstract: An anti-ripple injection method for injecting an anti-ripple signal into a control system of a pump is disclosed. The control system controls an electric motor via an electric motor drive, and the electric motor drives the pump. The anti-ripple signal causes pressure ripples in the pump output to be at least partially cancelled. The anti-ripple injection method comprises: injecting an anti-ripple signal of any waveform into the control system, the anti-ripple signal being represented by the following equation: f(θ)=ΣmAmcos(mθ+θm), wherein θ is the rotation angle of the motor shaft, m is the order of a signal harmonic in the anti-ripple signal, Am and θm are parameters with respect to the mth signal harmonic. A control system of a pump including the anti-ripple injection apparatus, and a pump system including the control system are also disclosed.
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公开(公告)号：US20170268499A1
公开(公告)日：2017-09-21
申请号：US14900044
申请日：2014-06-27
Applicant: EATON CORPORATION
Inventor： Yilun CHEN , Xiaomeng CHENG
CPC classification number: F04B49/06 , F04B17/03 , F04B19/22 , F04B49/065 , F04B51/00
Abstract: A servo pump control system (100) and a corresponding servo pump control method are disclosed. The servo pump control system (100) comprises a pressure controller (101) configured to receive a first control signal, and directly or indirectly provide a second control signal to the electric motor; and the pressure controller (101) configured to automatically commission at least one parameter without any manual adjustment.
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公开(公告)号：US20180080443A1
公开(公告)日：2018-03-22
申请号：US14899992
申请日：2014-06-27
Applicant: EATON CORPORATION
Inventor： Yilun CHEN , Xiaomeng CHENG
CPC classification number: F04B49/065 , F04B11/0041 , F04B17/03 , F04B19/22 , F04B49/08 , F04B49/20 , F04B2203/0201 , F04B2203/0204 , F04B2203/0209 , F04B2205/13 , H02P23/0004 , H02P23/04 , H02P23/28
Abstract: A control system and method of a VFD-based pump are disclosed. The control system controls an electric motor via a VFD, and the electric motor drives the pump. The control system comprises: an anti-ripple injection module for injecting an anti-ripple signal into a control path, the anti-ripple signal causing pressure ripples in the pump output to he at least partially cancelled. Further disclosed is a pump system, comprising: a VFD, an electric motor, and a pump, wherein the VFD comprises the control system stated above.
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公开(公告)号：US20170272017A1
公开(公告)日：2017-09-21
申请号：US14900033
申请日：2014-06-27
Applicant: EATON CORPORATION
Inventor： Yilun CHEN , Xiaomeng CHENG
IPC: H02P21/22 , H02P27/08 , F04B49/06 , H02M7/5387
CPC classification number: H02P21/22 , F04B49/06 , F04B49/065 , H02M7/53875 , H02M2007/53876 , H02P23/0077 , H02P27/08
Abstract: The present invention disclose a method and apparatus for pulse-width modulation (PWM) of a variable-frequency drive (VFD), the method comprising: for each sector of a space vector graph for PWM of the VFD, identifying at least two possible clamping phases in switching between the vectors in the sector; comparing currents in multiple phases in at least one PWM cycle; in the sector of the space vector graph corresponding to the PWM cycle, determining the possible clamping phase with the maximum current in the at least two possible clamping phases; and clamping the determined possible clamping phase with the maximum current.
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