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公开(公告)号：US20200169163A1
公开(公告)日：2020-05-28
申请号：US16695567
申请日：2019-11-26
Applicant: Danfoss Power Electronics A/S
Inventor： Ansgar Nielsen , Henrik Rosendal Andersen , Steen Hornsleth
Abstract: A power electronic device (1) is described comprising an input which is connected to an over-current-protection device arrangement (3) and a DC-link (7, 8), wherein the DC-link (7, 8) comprises a series connection of at least two DC-link capacitors (Cdc). In such a power electronic device the risk of a fire hazard should be minimized. To this end fault detecting means (14) are provided detecting an imbalance between the DC-link capacitors (Cdc) or an overload of at least one of the DC-link capacitors (Cdc), wherein the fault detecting means (14) control maximum current inducing means connected to the DC-link.
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公开(公告)号：US20200014313A1
公开(公告)日：2020-01-09
申请号：US16452805
申请日：2019-06-26
Applicant: Danfoss Power Electronics A/S
Inventor： Stefan Erb
Abstract: A method for identifying the magnetic anisotropy of an electric rotary field machine comprising a rotor and a stator is described, the method comprising the steps of setting injection pulses of equal absolute values during an injection interval, detecting a respective current response in form of current difference vectors, and determining the anisotropy from the voltage vectors and current difference vectors. Such a method should allow identifying of magnetic anisotropy in a simple way. To this end, injection pulses in the three-phase domain are used.
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公开(公告)号：US10480516B2
公开(公告)日：2019-11-19
申请号：US15386993
申请日：2016-12-21
Inventor： Robert W. Stiles, Jr. , Lars Hoffmann Berthelsen , Peter Westermann-Rasmussen , Gert Kjaer , Florin Lungeanu
Abstract: In accordance with one aspect, the present disclosure provides for systems and methods for controlling a pumping system for at least one aquatic application. The pumping system can include a pump, a motor coupled to the pump, an interface associated with the pump designed to receive input instructions from a user, and a controller in communication with the motor. The controller determines a blockage condition based on a power consumption value of the motor, and can further include an auto-restart function that is designed to allow the pump to automatically restart after detection of the blockage.
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公开(公告)号：US10415569B2
公开(公告)日：2019-09-17
申请号：US15724232
申请日：2017-10-03
Inventor： Robert W. Stiles, Jr. , Lars Hoffmann Berthelsen , Peter Westermann-Rasmussen , Gert Kjaer , Florin Lungeanu
Abstract: A pumping system for at least one aquatic application includes a motor coupled to a pump and a controller in communication with the motor. The controller is adapted to determine a first motor speed of the motor, determine a reference power consumption using a reference flow rate and a curve of speed versus power consumption for the reference flow rate, and generate a difference value between the reference power consumption and a present power consumption. The controller drives the motor to reach a steady state condition at a second motor speed based on the difference value.
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公开(公告)号：US20190238080A1
公开(公告)日：2019-08-01
申请号：US16312383
申请日：2017-07-05
Applicant: Danfoss Power Electronics A/S
Inventor： Leandro Della Flora , Anton Smith
Abstract: A method and apparatus is described in which a series of short-circuiting pulses is applied to a motor. A current in the motor is determined after one or more of the series of short circuit pulses has completed. The duration of the short-circuit pulses is adjusted depending on the determined current. The method and apparatus may be used within an arrangement for catching a spinning motor.
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Patent Agency Ranking
公开(公告)号：US20190222156A1
公开(公告)日：2019-07-18
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：US10241152B2
公开(公告)日：2019-03-26
申请号：US14908170
申请日：2014-07-09
Applicant: Danfoss Power Electronics A/S
Inventor： Mark A. Bertolasi , Michael Harke , Charles J. Romenesko , Shaohua Suo
IPC: G01R31/34
Abstract: A method of determining electromagnetic characteristics of an asynchronous motor system is described. A motor system model is presented including a stator resistance, a transient inductance, a magnetizing inductance and a rotor resistance. A DC sequence is used to determine the stator resistance, a voltage pulse is used to determine the transient inductance, a binary injection frequency search algorithm is used to determine the magnetizing inductance, and an AC sine wave at slip frequency with DC offset is used to determine the rotor resistance.
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公开(公告)号：US09742338B2
公开(公告)日：2017-08-22
申请号：US14898797
申请日：2014-05-23
Applicant: Danfoss Power Electronics A/S
Inventor： Omid Shajarati
IPC: H02K17/32 , H02P27/06 , H02P29/024 , H02J9/06
CPC classification number: H02P27/06 , H02J9/062 , H02P29/025
Abstract: A method of controlling a motor drive having a normal mode wherein a DC link voltage is charged using an AC (e.g. mains) power supply and an emergency mode wherein the DC link voltage is charged using a DC supply (e.g. from a battery) is described. In the normal mode of operation, if the DC link voltage falls below a threshold indicative of the AC power supply being lost, the emergency mode is entered, typically following an intervening coast mode (during which the motor is not driven). Similarly, in the emergency mode, if the DC link voltage rises above a threshold indicative of the AC power supply being restored, the normal mode is entered, typically following an intervening coast mode.
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公开(公告)号：US20250015677A1
公开(公告)日：2025-01-09
申请号：US18761807
申请日：2024-07-02
Applicant: Danfoss Power Electronics A/S
Inventor： Jörg Dannehl , Luzia Almeida
IPC: H02K11/21
Abstract: A method (100) for calculation of a mechanical speed of an electric rotational machine (400) including calculating (101) a frequency spectrum from signals measured by at least one vibration sensor (403) attached to the rotational machine (400); extracting (103) a mechanical speed component from the calculated frequency spectrum; calculating (105) the mechanical speed of the rotational machine (400) as a function of the mechanical speed component, wherein the mechanical speed component is extracted as a function of a frequency component that is greater than a given threshold (303).
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20.发明公开公开(公告)号：US20240183736A1
公开(公告)日：2024-06-06
申请号：US18527556
申请日：2023-12-04
Applicant: Danfoss Power Electronics A/S
Inventor： Thomas Pichler
IPC: G01M1/10
CPC classification number: G01M1/10
Abstract: A method for measuring mechanical system parameters, in particular the moment of inertia and friction effects, describing an electric motor system, includes the steps of applying a linear ramp of electrical torque corresponding to a current slope h to the system; measuring data representative of the velocity response of the system; fitting the measured data with a model function by applying a curve fitting algorithm, wherein a number of fitting parameters coincides with the mechanical system parameters of the system. An electric motor system is further disclosed having an electric motor and a frequency converter or drive, wherein the electric motor system is provided for carrying out a corresponding method.
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