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公开(公告)号：US10944348B2
公开(公告)日：2021-03-09
申请号：US16079635
申请日：2016-03-07
Applicant: Danfoss Power Electronics A/S
Inventor： Nicolas Trolle , Sanjeet Kumar Dwivedi
Abstract: A method (400) of determining equivalent circuit parameters of a three phase induction motor is provided. The method (400) comprises applying (410) a current to a stator winding (362) of an induction motor (360), and varying (420) a voltage applied to the stator winding to regulate the applied current to be a constant current. Application of the current is terminated (430) when the applied voltage has reached a constant voltage. The equivalent circuit parameters are determined (440) from the value of the constant current, the values of the applied voltage, and a time period until the applied voltage attains the constant voltage. The method may provide values for a resistance (210) of the stator winding, a resistance (250) of a rotor winding (364), a magnetizing inductance (230), and a total inductance leakage value (220, 240) for the stator winding and the rotor winding.
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公开(公告)号：US20210054846A1
公开(公告)日：2021-02-25
申请号：US16949656
申请日：2020-11-09
Inventor： Robert W. Stiles, JR. , Lars Hoffmann Berthelsen , Ronald B. Robol , Everett Cox , Donald Steen , Kevin Murphy , Daniel J. Hruby , Peter Westermann-Rasmussen , Gert Kjaer , Nils-Ole Harvest , Christopher Yahnker , Walter Woodcock , Einar Kjartan Runarsson , Arne Fink Hansen , Alberto Morando , Florin Lungeanu
IPC: F04D15/00
Abstract: A pumping system for at least one aquatic application. The pumping system includes a pump, a motor coupled to the pump, a filter coupled to the pump, and a controller in communication with the motor. The controller is configured to make a sensorless determination of a current value of a water flow rate based on an input power to the motor, drive the motor speed to maintain the water flow rate at a first constant value during a first time period, and drive the motor speed to maintain the water flow rate at a second constant value during a second time period.
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公开(公告)号：US10447107B2
公开(公告)日：2019-10-15
申请号：US14907912
申请日：2014-06-12
Applicant: Danfoss Power Electronics A/S
Inventor： George Miller , Ryan Drabek , Lester Grzesik , Matthew Gray , Frank-Erik Johansen , Eric Von Stoutenborough
Abstract: A cover for a motor drive is provided. The cover includes an opening (often at the bottom of the cover) to allow air to pass to an air inlet of the motor drive and an opening (often near the top of the cover) to allow air from an air outlet of the motor drive to exit the cover. A hood provides rain protection for the drive and a separator (such as a baffle) within the enclosure prevents air flowing within the enclosure from the air outlet to the air inlet of the drive. The hood and/or the separator are shaped to direct air from the air outlet away from the enclosure in order to substantially reduce the re-circulation of air from the air outlet to the air inlet of the drive.
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公开(公告)号：US10359472B2
公开(公告)日：2019-07-23
申请号：US15322340
申请日：2014-07-08
Applicant: DANFOSS POWER ELECTRONICS A/S
Inventor： Nicolas Trolle , Sanjeet Kumar Dwivedi
Abstract: An algorithm for identifying a motor type of a multi-phase (typically 3-phase) motor is described. The algorithm applies a series of active voltage vector pulses to the phases of the motor and measures the current rise-time for each applied voltage vector. The motor type is determined on the basis of the measured current rise-times.
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公开(公告)号：US10122165B2
公开(公告)日：2018-11-06
申请号：US14916219
申请日：2014-09-29
Applicant: Danfoss Power Electronics A/S
Inventor： Firuz Zare
Abstract: The present invention provides systems and methods for reducing harmonics, for example when using an AC to AC converter to drive a load such as a motor drive. In a first embodiment, a plurality of load driving circuits is provided, each drawing current from a 3-phase AC supply and driving an AC load, wherein each of said load driving circuit includes a 3-phase rectifier, with the rectifiers of the load driving circuits being controlled such that the rectification of the AC supply by the load driving circuits is staggered. In a second embodiment, a load driving circuit comprises an electronic inductor configured to control the DC link voltage and/or current such that the current drawn from the AC supply by the load driving circuit has a stepped profile. The first and second embodiments may be combined.
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Patent Agency Ranking
公开(公告)号：US09742260B2
公开(公告)日：2017-08-22
申请号：US14895298
申请日：2014-06-10
Applicant: Danfoss Power Electronics A/S
Inventor： Leandro Della Flora
Abstract: A method of initiating a grid-tied inverter is described, in which in-rush currents and DC overvoltage conditions are reduced or avoided. The method uses a pulse width modulator to drive the inverter under the control of a voltage feedforward signal such that the inverter output is dependent on the measured grid voltage. Then, an AC current feedback controller is enabled and the pulse width modulator is used to drive the inverter under the control of both the voltage feedforward control signal and the feedback control signal.
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公开(公告)号：US20160105093A1
公开(公告)日：2016-04-14
申请号：US14895298
申请日：2014-06-10
Applicant: DANFOSS POWER ELECTRONICS A/S
Inventor： Leandro Della Flora
Abstract: A method of initiating a grid-tied inverter is described, in which in-rush currents and DC overvoltage conditions are reduced or avoided. The method uses a pulse width modulator to drive the inverter under the control of a voltage feedforward signal such that the inverter output is dependent on the measured grid voltage. Then, an AC current feedback controller is enabled and the pulse width modulator is used to drive the inverter under the control of both the voltage feedforward control signal and the feedback control signal.
Abstract translation: 描述了启动并联逆变器的方法，其中降低或避免了浪涌电流和DC过电压条件。 该方法使用脉宽调制器在电压前馈信号的控制下驱动逆变器，使得逆变器输出取决于测量的电网电压。 然后，AC电流反馈控制器被使能，脉宽调制器用于在电压前馈控制信号和反馈控制信号的控制下驱动逆变器。
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公开(公告)号：USD1066250S1
公开(公告)日：2025-03-11
申请号：US29907962
申请日：2024-01-10
Applicant: Danfoss Power Electronics A/S
Designer： Michael Sørensen
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公开(公告)号：US20250030366A1
公开(公告)日：2025-01-23
申请号：US18774409
申请日：2024-07-16
Applicant: Danfoss Power Electronics A/S
Inventor： Ana-Mari Tataru Kjær , Lucian Asiminoaei
Abstract: A method for estimating electrical parameters of an electric motor (205) and a power filter (203) connected to a power converter (201) including injecting an AC signal of different frequencies for a given time window in the power filter (203) and the motor (205), measuring a response signal of the power filter (203) and the motor (205) to the injected AC signal, determining a resonance frequency of the power filter (203) based on the measured response signal, calculating a ratio of leakage inductances of the power filter (203) and the motor (205).
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公开(公告)号：US11837964B2
公开(公告)日：2023-12-05
申请号：US17282841
申请日：2019-04-10
Applicant: Danfoss Power Electronics A/S
Inventor： Nicklas Södö , Juha Norrena
Abstract: A method for detecting low impedance condition at an output (15) of an electrical converter (10), a control unit (1000), a computer program product, and an electrical converter (10) are presented. The method includes determining (110) a first current value (I1(T1)) of a first current (I1), and a second current value (I1(T2)) of the first current (I1), and determining (120) a first current difference (ΔI1) between the first (I1(T1)) and the second (I1(T2)) current values, and comparing (130) the first current difference (ΔI1) to a first current difference threshold (I1_TH), and if the first current difference (ΔI1) is of predefined magnitude with respect to the first current difference threshold (I1_TH), such as higher, turning off (140) a first voltage (U1) driving the first current (I1), such as by switching off a corresponding switch or switches for applying the first voltage (U1) to the output (15).
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