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公开(公告)号：US20240171097A1
公开(公告)日：2024-05-23
申请号：US18279271
申请日：2022-03-22
申请人： Fanuc Corporation
发明人： Tatsuya Senoo
CPC分类号： H02P6/185 , H02P6/28 , H02P2207/05
摘要： Provided is a control device for a synchronous motor, the control device including a DC excitation command generation unit which generates a command for sending a DC current with a fixed current phase to a synchronous motor, and controls the magnitude of the DC current so as to apply deceleration torque to a rotor of the synchronous motor on the basis of at least one among the angular acceleration and the angular velocity of the rotor; and a magnetic pole position acquisition unit that acquires, as information indicating the magnetic pole position, the angular position of the rotor based on the output signal when a predetermined detection end condition is satisfied.
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公开(公告)号：US20230119985A1
公开(公告)日：2023-04-20
申请号：US17504729
申请日：2021-10-19
摘要： Systems and methods for position determination in an electric machine are provided. Aspects include a DC power source connected to an inverter circuit, an electric motor comprising a rotor and a stator, wherein an output of the inverter circuit is connected to a plurality phase of windings, and a controller configured to operate the electric motor and the inverter circuit, wherein the controller is further configured to determine one or more inactive phase windings from the plurality of phase windings, supply a voltage to the inactive phase windings, receive, from a current sensor connected to the electric motor, a current for each inactive phase winding of the inactive phase windings, determine an inductance for each inactive phase winding of the inactive phase winding based on the current, and determine a position of the rotor in the electric motor based on the inductance for each inactive phase winding.
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3.发明申请公开(公告)号：US20230068845A1
公开(公告)日：2023-03-02
申请号：US17462721
申请日：2021-08-31
发明人： Kwei Chung Li
摘要： Described is a method of determining an initial rotor position on start-up of a synchronous motor. The method comprises applying at each of a plurality of pre-set motor angles a pair of voltage vector pulses, the pair of voltage vector pulses comprising a first and second pulses, each having the same amplitude but opposite polarities, the second pulse being applied immediately or near immediately after the first pulse. The method includes determining the stator current responses to said pairs of applied voltage vector pulses at said plurality of pre-set motor angles. Then, the initial rotor position can be determined from either of a stator angle corresponding to a pair of vector voltage pulses resulting in (a) a largest sum of stator currents or (b) where the sum of stator currents changes from a negative to a positive motor angle.
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公开(公告)号：US11527974B2
公开(公告)日：2022-12-13
申请号：US17153111
申请日：2021-01-20
发明人： Torben Jonsky
摘要： A method ascertains current-dependent inductances of a polyphase electrical machine. The method generates phase voltages for the polyphase electrical machine by means of a pulse width modulation such that currents of predefined current level flow through stator windings of the electrical machine. During a number of cycles of the pulse width modulation, the method generates a voltage pulse such that a change of current is brought about in a torque-forming axis of the polyphase electrical machine and/or in a field-forming axis of the polyphase electrical machine. The method measures the change of current, and ascertains the current-dependent inductances on the basis of the change of current.
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公开(公告)号：US11444558B1
公开(公告)日：2022-09-13
申请号：US17323057
申请日：2021-05-18
摘要： A motor system can include a motor, the motor including at least a rotor, and a controller configured to operate the motor. The controller can be configured to perform operations for operating the motor. The operations can include determining an initial estimated rotor angle, determining one or more estimated currents defined by an estimated rotating reference frame based at least in part on the estimated rotor angle, obtaining one or more current measurements of one or more measured currents respective to the one or more estimated currents, determining one or more current errors based at least in part on a subtractive combination of the one or more estimated currents and the one or more measured currents, determining one or more rotor flux estimates based at least in part on the one or more current errors, the one or more rotor flux estimates comprising at least an estimated δ-directed rotor flux vector, and determining an estimated rotor speed based at least in part on an integral of the estimated δ-directed rotor flux vector.
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公开(公告)号：US20220166356A1
公开(公告)日：2022-05-26
申请号：US17598429
申请日：2019-06-04
发明人： Jun KITAGAWA , Tatsuya MORI , Isao KEZOBO , Seiji SAWADA , Kenta KUBO
摘要： To provide a controller for rotary electric machine which can suppress the increase in the switching frequency by the voltage for estimation while reducing the estimation delay of the magnetic pole position (the rotational angle). A controller for rotary electric machine turns on and off switching devices which the inverter has and applies voltage to the winding, based on a comparison result between the voltage command and the carrier wave; generates the voltage command for estimation of a preliminarily set one period on a stationary coordinate system fixed to the winding; generates the carrier wave of the same one period as the one period of the voltage command for estimation; extracts the frequency component of the one period of the voltage command for estimation from the current detection value; and estimates a rotational angle based on the frequency component.
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公开(公告)号：US11342868B2
公开(公告)日：2022-05-24
申请号：US16452805
申请日：2019-06-26
发明人： Stefan Erb
摘要： 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：US11316451B2
公开(公告)日：2022-04-26
申请号：US15739300
申请日：2016-06-24
发明人： Heiko Stichweh , Gennadi Boehm
摘要： A method for determining current-dependent and/or rotational angle position-dependent characteristic variables of an electrical machine by setting a rotational angle position of blocking a rotor, forming a series current desired value using a series current desired value alternating signal which changes periodically and/or forming a parallel current desired value using a parallel current desired value alternating signal which changes periodically, regulating a series current using the series current desired value and/or a parallel current using the parallel current desired value, measuring phase currents of the electrical machine and determining an established series current and/or an established parallel current, producing series setting voltage coefficients and series current coefficients and/or parallel setting voltage coefficients and parallel current coefficients using a discrete Fourier transform algorithm, and calculating characteristic variables on the basis of series setting voltage coefficients and series current coefficients and/or parallel setting voltage coefficients and parallel current coefficients.
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公开(公告)号：US20220094285A1
公开(公告)日：2022-03-24
申请号：US17031374
申请日：2020-09-24
发明人： Tao Zhao
摘要： An apparatus includes a controller that controls a motor including multiple motor windings. To determine motor position, the controller is operative to supply current through the multiple windings of the motor. The multiple windings are coupled to a rotor of the motor. While supplying the current to the motor windings, the controller monitors a magnitude of the current supplied through the windings of the motor. Based on measured inductance associated with the motor as determined from the monitored current through the windings, the controller determines a (rotational) position of the rotor.
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公开(公告)号：US11146190B2
公开(公告)日：2021-10-12
申请号：US16276810
申请日：2019-02-15
申请人： NXP USA, INC.
发明人： Libor Prokop
摘要： A method for controlling a multiphase synchronous motor, for a motor flux vector includes setting a first winding of the motor to a floating state in which the first winding is electrically floating; setting a voltage across a second winding of the motor for a first period; receiving first voltage samples associated with the first winding in the first period; setting the voltage across the second winding to a second period, in which the first period and the second period are periods of one or more pulse width modulation cycles, in which a polarity of the voltage across the second winding in the second period is opposite to a polarity of the voltage across the second winding in the first period; receiving second voltage samples associated with the first winding in the second period; and determining a position of the rotor based on the first and second voltage samples.
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