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公开(公告)号：US11863093B2
公开(公告)日：2024-01-02
申请号：US17761657
申请日：2020-08-20
申请人： Nidec Corporation
发明人： Tomohiro Fukumura , Linfeng Lan
摘要： A first torque estimator determines a first torque estimation value according to a cross product method, and a second torque estimator determines a second torque estimation value according to an energy method. A torque weight adjuster adjusts, using a weighting coefficient calculated in accordance with a predetermined condition, weightings respectively applied to these two types of torque estimation values, and outputs a torque estimation value.
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公开(公告)号：US11736057B2
公开(公告)日：2023-08-22
申请号：US17926501
申请日：2021-05-07
发明人： Horst Geyer
IPC分类号： H02P29/66
CPC分类号： H02P29/664
摘要： An arrangement for determining a temperature of an electric machine includes a supply unit for operating the electric machine, with a first temperature of the electric machine computed with a first thermal model of the electric machine in the supply unit, and a computing facility connected to the supply unit by way of a data transmission channel, with a second temperature of the electric machine computed with a second thermal model of the electric machine in the computing facility. The supply unit and the computing facility communicate by way of the data transmission channel so as to enable the computing facility to determine the second temperature of the electric machine with the second thermal model even when no current is supplied to the supply unit.
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公开(公告)号：US20230188081A1
公开(公告)日：2023-06-15
申请号：US17926501
申请日：2021-05-07
发明人： Horst Geyer
IPC分类号： H02P29/66
CPC分类号： H02P29/664
摘要： An arrangement for determining a temperature of an electric machine includes a supply unit for operating the electric machine, with a first temperature of the electric machine computed with a first thermal model of the electric machine in the supply unit, and a computing facility connected to the supply unit by way of a data transmission channel, with a second temperature of the electric machine computed with a second thermal model of the electric machine in the computing facility. The supply unit and the computing facility communicate by way of the data transmission channel so as to enable the computing facility to determine the second temperature of the electric machine with the second thermal model even when no current is supplied to the supply unit.
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公开(公告)号：US20230163715A1
公开(公告)日：2023-05-25
申请号：US17920036
申请日：2020-06-05
发明人： Yuichiro NAKAMURA , Yuya TSUCHIMOTO
CPC分类号： H02P29/662 , H02P21/141
摘要： A motor temperature and torque estimation device comprises: a temperature sensor; a losses estimation circuitry to estimate an iron loss; a first temperature estimation circuitry to estimate a first magnet temperature from the estimated iron loss and a sensor's detected temperature; a second temperature estimation circuitry, to input into a magnet's magnetic flux calculator thereinside motor's modified inductance, to estimate a second magnet temperature from magnet's magnetic flux calculated through voltage equations; a magnet-temperature estimation circuitry to estimate a motor's magnet temperature from the first and second magnet temperatures; a magnet's magnetic estimation circuitry to estimate magnetic flux based on the calculated/modified one, the motor's estimated magnet temperature and temperature characteristics, and to output the estimated magnetic flux into the losses estimator; and a torque estimation circuitry to estimate torque based on the estimated magnetic flux and iron loss, wherein a motor's magnet temperature(s) and torque are estimated.
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公开(公告)号：US11482964B2
公开(公告)日：2022-10-25
申请号：US16766235
申请日：2018-11-23
发明人： Behnam Houshmand , Christian Loesch , Markus Sons
摘要： The disclosure relates to a redundant electric machine for driving a propulsion means with increased operational safety. The machine may include two systems, with each system including a stator winding system and a rotor assigned thereto with permanent magnets, wherein the rotors are fastened on a common shaft for driving the propulsion means. If a fault occurs in one of the stator winding systems, the rotor, which continues to rotate, has to be prevented from inducing electric voltages in the stator winding system because this may lead to a fire in the machine. A demagnetization apparatus is therefore provided which, in a targeted manner, demagnetizes the permanent magnets of the rotor assigned to the faulty stator winding system such that the inducing of electric voltages is prevented.
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公开(公告)号：US20220149768A1
公开(公告)日：2022-05-12
申请号：US17454348
申请日：2021-11-10
发明人： Alexander Rambetius
IPC分类号： H02P29/66 , H02P27/06 , H02M7/5387 , B60L15/20
摘要： The inverter (110) comprises input terminals (IT+, IT−), output terminals (OT), controllable switches (Q, Q′) connected to the input terminals (IT+, IT−) and to the output terminals (OT) and a control device (116) configured to control the controllable switches (Q, Q′) so as to convert a DC voltage at the input terminals (IT+, IT−) into an AC voltage at the output terminals (OT) intended to drive an asynchronous electric motor (108) to achieve a target torque (T*), selectively: in a first mode of operation in which the target torque (T*) is determined according to a torque determination method, and in response to a rotor temperature (Tr), in a second mode of operation in which losses in the rotor are decreased relative to the first mode of operation while the target torque (T*) remains determined according to the torque determination method of the first mode of operation.
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公开(公告)号：US20220069760A1
公开(公告)日：2022-03-03
申请号：US17342795
申请日：2021-06-09
发明人： Hitoshi ISODA , Shinsuke KAYANO , Kengo KUMAGAI , Noriyuki WADA
摘要： To provide a controller for rotary electric machine which can estimate a transitional temperature with good accuracy, while considering the heating amount and the heat radiation amount due to copper loss and iron loss which change according to the operating point of rotational speed and torque, and suppressing the increase in arithmetic load. A controller for rotary electric machine, at calculation timing of every estimation calculation period, by referring to a temperature prediction data in which a relationship among a rotational speed, a torque information, a temperature at a reference time point, and a temperature after lapse of the estimation calculation period from the reference time point, calculates an estimation value of temperature after lapse of the estimation calculation period from the last time calculation timing, corresponding to the present rotational speed, the present torque information, and the estimation value of temperature calculated at the last time calculation timing.
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公开(公告)号：US11260829B2
公开(公告)日：2022-03-01
申请号：US16482536
申请日：2018-01-31
申请人： DENSO CORPORATION
发明人： Yuta Doi
摘要： A wiper motor control circuit carries out control in which a driving circuit generates, and supplies to a wiper motor, a voltage that eliminates deviation between a target speed and an actual speed of an output shaft. In a case in which a state in which the deviation between the target speed and the actual speed is greater than or equal to a predetermined threshold value continues for a predetermined time or more, the wiper motor control circuit carries out control that lowers the target speed and in which the driving circuit generates, and supplies to the wiper motor, a voltage that eliminates deviation between the lowered target speed and the actual speed of the output shaft.
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公开(公告)号：US20210234495A1
公开(公告)日：2021-07-29
申请号：US17131064
申请日：2020-12-22
发明人： Nobuhide Seo , Genri Suzuki
摘要： A magnet temperature estimating device for a motor including a rotor having magnets and configured to output a rotational motive force, and a stator having a plurality of coils opposing the rotor with a gap therebetween, is provided. The device includes a sensor configured to detect an induced voltage induced by rotation of the rotor, and a controller configured to control the motor by supplying power to the plurality of coils in response to an input of a detection signal from the sensor. Gaps adjacent to each magnet in a rotation direction of the rotor are formed in the rotor. The controller estimates a temperature of the magnet based on the induced voltage detected when the magnet opposes any one of the plurality of coils, according to the rotation of the rotor.
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公开(公告)号：US11031901B2
公开(公告)日：2021-06-08
申请号：US16515761
申请日：2019-07-18
申请人： LINDSAY CORPORATION
IPC分类号： H02P29/032 , H02P29/66 , A01G25/16 , G05B23/02 , A01G25/09
摘要： A control system for monitoring a motor and wheel drive gearbox of an irrigation system drive train. The control system includes a motor sensor for sensing an operating state of the motor and a gearbox sensor for sensing an operating state of the wheel drive gearbox. If the motor operating state exceeds a motor operating state threshold or changes too quickly, or if the wheel drive gearbox operating state exceeds a wheel drive gearbox operating state threshold or changes too quickly, the control system operates the drive train at a reduced capacity or in a modified mode such that the operating state is not exceeded or does not change too quickly.
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