923results about "Torque ripple control" patented technology

The invention relates to the technical field of motor control, and discloses a control method and system of a permanent magnet direct current brushless slotless motor. The method comprises the following steps: performing temperature compensation and signal filtering on voltage data of a Hall sensor to obtain rotor position information and temperature characteristic data; performing magnetic field intensity dynamic compensation calculation according to the rotor position and the temperature data to obtain magnetic field intensity parameters; adjusting the amplitude and phase of the three-phase current according to the magnetic field intensity parameter, and generating a current control quantity; extracting and compensating a harmonic component to obtain a torque smooth control instruction; all losses are calculated and optimized, and efficiency optimization parameters are generated; and performing feature extraction and anomaly judgment on the operation parameters, and outputting a protection control strategy. Accurate detection of motor position signals, stable control of torque, optimal control of loss and real-time monitoring and protection of abnormal states are achieved under the high-temperature working condition, and therefore stable operation and the service life of the motor under the high-temperature environment are guaranteed.

The invention relates to the technical field of brushless motor testing, and discloses a test adjusting method and system for an intelligent brushless motor, and the method comprises the steps: carrying out the real-time monitoring of the current, rotating speed and load characteristics of the brushless motor, obtaining the operation data of the motor, and obtaining a motor working mode recognition result; constructing a motor parameter hierarchical optimization scheme; performing dynamic optimization to obtain a motor adaptive control parameter set; performing rolling optimization solution to obtain a motor prediction control instruction sequence; performing multi-objective optimization calculation to obtain a motor multi-performance balance adjustment scheme; a motor multi-performance balance adjustment scheme is integrated into a digital twin test platform, simulation verification is carried out on the performance of the brushless motor under different working conditions, a motor test adjustment strategy is obtained, the working mode of the motor can be recognized in real time, parameter optimization and performance prediction can be carried out based on historical data and the current state, and the stability of the motor test adjustment strategy is improved. Therefore, the optimal operation state of the motor under different working conditions is realized.

The invention discloses a permanent magnet synchronous motor active disturbance rejection speed control method based on a double-error correction extended state observer, and the method comprises the steps: constructing a double-error correction extended state observer structure combining a speed estimation error and a position estimation error, and outputting a speed ring lumped disturbance observation value to a feedback control law. An optimized observer parameter setting strategy is designed based on the control structure, decoupling configuration of a zero point and a pole point in a disturbance suppression function is achieved, the position of the zero point in the disturbance suppression function is optimized by combining time domain and frequency domain analysis, and the disturbance suppression performance of the system is enhanced. Therefore, the method has the advantages that on the premise that pole assignment of an original closed-loop system is not affected, the dynamic response and steady-state performance of disturbance suppression are enhanced through the additional zero-point movement track, and the degree of freedom of performance adjustment of the linear expansion state observer and the upper limit of disturbance suppression performance are widened.

The invention relates to the technical field of electric driving system energy-saving control, and discloses a multi-motor driving system torque optimal distribution method and system, and the method comprises the steps: building a single power unit power loss model of a multi-motor driving system; constructing a fitting straight line segment; constructing a torque-current mapping relation curve; a train speed prediction model, a multi-motor driving system power unit motor rotating speed prediction model, a multi-motor driving system total torque reference value prediction model and a multi-motor driving system power unit power loss prediction model are constructed; establishing a multi-motor driving system energy efficiency evaluation function, a multi-motor driving system stability evaluation function, a multi-motor driving system total torque following evaluation function and a system optimization objective function; designing a learning rate of a control vector; and updating the control vector according to the learning rate, and obtaining an optimized torque distribution coefficient and an optimized torque reference value distributed by each power unit. Therefore, the torque optimization distribution of the multi-motor driving system is realized, and the energy utilization efficiency of the system is improved.

The invention discloses a motor control device and an air conditioner, and the motor control device comprises a position / rotation speed estimation unit which estimates a rotor position and a rotor rotation speed of an AC motor driven by an inverter according to a detection current (iq, id) on a control shaft and a voltage command value (Vd *, Vq *) inputted to the inverter; and a current ripple suppression controller for estimating compensation currents (iqcmp, idcmp) for compensating the current command values (iq *, id *) on the control axis from the detection currents (iq, id) on the control axis and the mechanical angle of the rotor, respectively, so as to reduce position observation errors caused by current control fluctuations. The influence of current pulsation on position observation can be suppressed, and the motor position observation accuracy is improved.

In a general aspect, a method can include applying. by a motor controller, a filter to a signal indicating rotational speed of an electric motor to detect an order of vibration of the electric motor to be attenuated. The method can also include providing the filtered signal to a proportional derivative controller, and generating, by the proportional derivative controller, an attenuation signal for attenuating vibration associated with the detected order of vibration. The method can still further include combining the attenuation signal with a torque command signal to produce a combined torque command signal. The torque command signal can indicate an amount of torque requested from the electric motor. The method can further include producing torque with the electric motor based on the combined torque command signal.

The invention discloses a hybrid effective flux linkage observer and a permanent magnet synchronous motor control method, device and system. The method comprises the following steps: carrying out Clarke conversion on an obtained three-phase current of the permanent magnet synchronous motor to obtain a current in a static coordinate system, and carrying out park conversion based on rotor position information to obtain a current in a synchronous rotating coordinate system; the effective flux linkage of the permanent magnet synchronous motor is obtained through the hybrid effective flux linkage observer; on the basis of the obtained effective flux linkage of the permanent magnet synchronous motor, dead-zone compensation voltage is obtained through self-adaptive gain dead-zone compensation calculation based on back electromotive force reconstruction, and the rotating speed and the rotor position of the permanent magnet synchronous motor are obtained through phase-locked loop calculation; according to the rotating speed and the rotor position of the permanent magnet synchronous motor, the current under the synchronous rotating coordinate system, the dead zone compensation voltage and the obtained reference rotating speed and reference current, the reference voltage of the motor at the k moment is obtained through a rotating speed loop and a current loop and used for achieving low-speed position-sensorless control over the permanent magnet synchronous motor.

The invention discloses a permanent magnet motor cogging torque analysis method considering iron core saturation. Different from an existing analysis method which does not consider iron core saturation, after the iron core saturation is considered, air gap magnetic conductance varies, a saturation coefficient is introduced, and a modulation unit is converted into stator slot and saturation coefficient combined modulation from stator slot independent modulation, so that harmonic components of air gap flux density are changed. The number of harmonic pole pairs and the rotating speed after the air gap flux density is changed are determined through Fourier decomposition, the traveling wave pair generating the cogging torque is found out according to the cogging torque generation condition of the same number of pole pairs and different rotating speeds, and effective supplement is made for an existing cogging torque analysis method.

Systems and methods are provided for controlling two or more linear generators each operating according to a repeated behavior to constitute a cycle. A control system utilizes control circuitry to determine a desired phase offset between operation cycles of a first linear generator and a second linear generator of the two or more linear generators. During operation, an actual phase offset between the first linear generator and the second linear generator is determined. The control circuitry of the control system is used to modify the operation of at least one of the first linear generator or the second linear generator to achieve the desired phase effect.

A power conversion apparatus includes a converter that rectifies a first alternating-current voltage supplied from an alternating-current power supply that is a three-phase alternating-current power supply, a capacitor connected to an output end of the converter and smooths a first direct-current voltage obtained by rectification by the converter into a second direct-current voltage containing a first ripple, an inverter that is connected across the capacitor and converts the second direct-current voltage into a second alternating-current voltage dependent on a desired frequency, and a voltage detection unit that detects a physical quantity correlated with the second direct-current voltage, in which the second alternating-current voltage is controlled such that a second ripple correlated with the first ripple is superimposed on an output voltage from the inverter.

The invention provides a motor control device which can simultaneously realize reduction of time required for design and adjustment of correction amounts of amplitude and phase corresponding to response characteristics and guarantee of a torque ripple suppression effect. A motor control device (1) drives a motor (5) using an inverter (4). A motor control device (1) is provided with: a harmonic control command value calculation unit (8) that finds first harmonic control command values (i * dqh, phi * dqh) on the basis of a torque command value (tau *) and an electrical angle ([theta] e) of a motor (5); a response compensation unit (9) that calculates second harmonic control command values (i * * dqh, phi * * dqh) obtained by performing response characteristic compensation on the first harmonic control command value (i * dqh) in accordance with the rotational speed of the motor (5); and a voltage command calculation unit (3) that calculates a voltage command value (v * dq) on the basis of a torque control command for outputting the torque command value (tau *) and the second harmonic control command values (i * * dqh, phi * * dqh).

The invention discloses a model prediction control method of a high-speed permanent magnet synchronous motor and a related device, and relates to the field of control, and the method comprises the steps: building a stator current equation capable of simulating the behavior of the high-speed permanent magnet synchronous motor based on the position change of a rotor in the same control period, a high control input basic voltage value is obtained by fixing motor parameters and combining a total disturbance parameter of a current loop system and a set stator current tracking target at the next moment at the same time; on the basis of the control input basic voltage value, current loop harmonic voltage compensation is carried out through the control input harmonic compensation voltage value to obtain a control input voltage value, and voltage modulation is carried out according to the control input voltage value to control the high-speed permanent magnet synchronous motor. According to the method, when the stator current equation is constructed, rotor position change parameters in the same control period are innovatively introduced, so that the motor behavior simulation precision is remarkably improved; the defect that the switching frequency is not fixed in a traditional finite set model predictive control algorithm is effectively overcome through the voltage modulation technology.

A self-excitation motor disclosed by the present invention comprises a rotor, a first end of the rotor is equipped with a rectification circuit, the rotor comprises a rotor iron core and a plurality of harmonic windings and excitation windings, the rotor iron core is provided with rotor teeth, and each harmonic winding and each excitation winding are respectively wound on the corresponding rotor teeth. Each harmonic winding comprises a first harmonic winding and a second harmonic winding, the winding directions of the first harmonic winding and the second harmonic winding are the same, star connection is adopted, one ends of the first harmonic winding and the second harmonic winding are connected in series in a one-to-one mode, and the other ends of the first harmonic winding and the second harmonic winding are jointly connected to form a star neutral point; the other end of each second harmonic winding is connected with the midpoint of each bridge arm in the rectifying circuit in a one-to-one manner; the winding directions of the excitation windings on every two adjacent rotor teeth are opposite, and the two ends of each excitation winding are electrically connected with the direct current output end of the rectification circuit. This induces and rectifies the current for excitation more efficiently. The invention further provides a motor control strategy based on high-frequency harmonic current phase optimization.

The invention relates to the technical field of motor control, discloses a direct current brushless motor control method and system based on current prediction, and aims to solve the problems of large torque ripple, low efficiency and poor stability caused by current loop lag in the prior art. The method comprises the following steps: acquiring a motor operation state signal in real time; determining a sector and an electrical angular velocity based on the rotor position and the rotational speed; inputting related parameters into the mixed current prediction model to obtain a three-phase current prediction value of the next period; a prediction error is calculated in combination with a current instruction, and an optimal voltage vector enabling a cost function to be minimum is solved through a model prediction control algorithm; and finally, a space vector pulse width modulation signal is generated to drive an inverter. According to the method, advanced control is realized by fusing a physical model and a data-driven prediction mechanism, the torque ripple is remarkably reduced, and the energy efficiency and robustness are improved.

A motor control system includes a measurement interface designed to measure a mechanical angle of a shaft driven by a motor and a rotational speed of the shaft, and to generate a speed feedback signal representative of the rotational speed, a speed controller, and a current controller.The speed controller comprises an error component configured to generate a speed error signal based on the difference between a speed reference signal and the speed feedback signal; a proportional-integral controller configured to regulate a torque reference value based on the speed error signal and to maintain a speed reference value; and a load torque ripple compensator configured to apply a torque feedforward function to reduce load torque ripple in the torque reference value. The current controller is configured to drive motor currents to generate a torque equal to the torque reference value.

The invention discloses a coaxial double-switch reluctance motor torque ripple minimization control method, which comprises the following steps: establishing a unified model for two switch reluctance motors, obtaining a reference torque through a proportional integral controller after making a difference between a reference rotating speed and an actual rotating speed, and establishing a phase current prediction model according to a phase voltage equation of the switch reluctance motors, based on the predicted current and the predicted angle, establishing a torque prediction model in a positive voltage excitation and zero voltage follow current mode in the conduction interval of each phase winding, and establishing a torque prediction model in a negative voltage demagnetization mode in the turn-off interval of each phase winding to obtain predicted torques of each phase winding in the conduction interval and the turn-off interval; and establishing a unified evaluation function by using the predicted torque and the reference torque of each phase winding of the two switched reluctance motors, and selecting an optimal switching state which enables the evaluation function to be minimum, thereby realizing the torque pulsation minimization control of the coaxial double-switched reluctance motor. The torque ripple minimization control method of the coaxial double-switch reluctance motor is not influenced by the phase difference of the double motors and the conduction range of each phase winding, can be easily expanded to a double-switch reluctance motor driving system with any phase number, and has good application prospect and engineering value.

The invention relates to an aircraft turbine engine (T) comprising an electric machine (1) connected to a transmission line (2) and a control device (3) configured to determine the currents flowing through the electric machine (1) so that it provides an electric machine torque in accordance with a control torque, wherein the control device (3) comprises a correction module (4) configured to correct the torsional mode (Mt) of the transmission line (2), wherein the correction module (4) is configured to determine a time measurement of a torque parameter of the rotor (12) of the electric machine (1) over a monitoring range, calculate a correction torque from the time measurement over the monitoring range, and calculate the control torque from a reference torque (TRQcons) and the correction torque.

A power conversion apparatus includes a converter that rectifies a first AC voltage supplied from an AC source, a capacitor that is connected to an output end of the converter and smooths a first DC voltage rectified by the converter into a second DC voltage including a first ripple, an inverter that is connected across the capacitor and converts the second DC voltage into a second AC voltage corresponding to a desired frequency, and a voltage detection unit that acquires a physical quantity correlated with the second DC voltage, and controls the second AC voltage to superimpose a second ripple correlated with the first ripple on an output voltage of the inverter.

The invention discloses a topology circuit of an isolated single-phase integrated vehicle-mounted charging system for an electric vehicle and a control method of the topology circuit. The topology circuit comprises an open-winding permanent magnet synchronous motor, a dual three-phase inverter, a power battery pack, a bus capacitor, a high-frequency transformer, a winding change-over switch K1, a winding change-over switch K2 and a bus change-over switch G1, through switching of the winding change-over switch K1, the winding change-over switch K2 and the bus change-over switch G1, the system works in a driving mode or a charging mode, and the system is controlled in combination with a driving control method and a charging control method. According to the invention, electrical isolation of the integrated vehicle-mounted charging system is realized without adding extra power devices and industrial frequency transformers, and the reliability and safety of charging are improved.

A torque ripple reduction method for a synchronous electric motor of a vehicle includes obtaining, by a control system, look-up tables (LUTs) that each include harmonic currents that satisfy a constrained objective function for phase current magnitude for the synchronous electric motor, based on a requested motor torque, determining, by the control system and using the LUTs, a plurality of currents including fundamental direct and quadrature currents and 6th order and 12th order harmonic quadrature currents, determining, by the control system, direct and quadrature voltages for the synchronous electric motor based on the plurality of currents including injection of the 6th and 12th order harmonic quadrature currents, and controlling, by the control system, the synchronous electric motor based on the determined direct and quadrature voltages to at least one of reduce torque ripples and increase efficiency of the synchronous electric motor.

Methods, controllers and electric machine systems are described that facilitate pulsed control of electric machines (e.g., electric motors and generators) to improve the machine's energy conversion efficiency. Under selected operating conditions, the electric machine is intermittently driven (pulsed). The pulsed operation causes the output of the electric machine to alternate between a first output level and an off state. The output levels are selected such that the electric machine has a higher energy conversion efficiency during the pulsed operation than the electric machine would have when operated at a third output level that would be required to drive the electric machine in a continuous manner to deliver the desired output. In some embodiments, the power converter it turned off during at least portions of the time that the electric machine is pulsed off.

The invention discloses a high-speed brushless direct current motor torque ripple suppression method, device and equipment and a storage medium, and belongs to the technical field of motor control. The method comprises three steps of adaptive harmonic suppression processing, phase compensation angle calculation and dynamic phase compensation. According to the invention, the center frequency is dynamically adjusted through the adaptive harmonic wave notch filter, the dominant harmonic component is inhibited in real time, and in combination with cascade delay signal elimination, 6k fixed subharmonics are filtered through the CDSC filter, so that a fundamental wave current signal is obtained; park transformation is carried out on the fundamental wave current based on an FOC algorithm, a PI controller is utilized to generate a phase delay angle according to a d-axis current error, and then a reference current compensation module dynamically compensates a current reference value to ensure phase synchronization of phase current and back electromotive force. Compared with the prior art, additional hardware equipment is not needed, and the torque ripple of the BLDC is reduced.

The invention discloses a permanent magnet synchronous motor cogging torque suppression method and device based on coordinate analysis, and belongs to the technical field of permanent magnet synchronous motors, and the method comprises the steps: effectively suppressing the cogging torque of a permanent magnet synchronous motor through collaborative optimization of the geometric parameters of stator and rotor auxiliary slots, reducing the torque pulsation, and improving the vibration noise, thereby improving the cogging torque of the permanent magnet synchronous motor. The comprehensive performance of the motor is improved. Wherein the stator auxiliary slots weaken periodic components related to stator tooth slots in air gap magnetic conductance harmonic waves by adjusting slot widths and depths, and excitation of the periodic components to tooth slot torque is reduced; the rotor auxiliary grooves optimize the pole-arc coefficient by adjusting the opening angle, and remanence harmonic waves of the permanent magnets are inhibited from being periodically matched and coupled with the stator tooth grooves. The collaborative design of the two enables the amplitudes and phases of air-gap magnetic conductance harmonic waves and permanent magnet residual magnetic harmonic waves to be mismatched, the amplitude of cogging torque is remarkably reduced, meanwhile, periodic disturbance of an air-gap magnetic field is reduced, the output torque is more stable, and mechanical vibration and noise caused by electromagnetic force fluctuation are synchronously weakened.

An electric motor system, such as for an electrified vehicle, includes a permanent magnet motor (PMM) including a hollow cylindrical stator defining a circular inner portion with a plurality of slots, defined between a respective plurality of ferromagnetic teeth, and having a plurality of electromagnetic coils arranged in the plurality of slots, respectively, and a cylindrical rotor disposed within the stator and defining a circular outer portion having N pairs of permanent magnets arranged thereabout to define N rotor poles, respectively, wherein N is an even integer greater than or equal to four, and a controller configured to control the PMM to mitigate or eliminate magnetic cogging by controlling each pair of electromagnetic coils to stagger or offset a stator magnetic field generated by the pair of electromagnetic coils relative to the rotor magnetic poles.

The invention discloses a permanent magnet motor starting control method and system based on harmonic injection, and aims to improve the harmonic injection precision and the dynamic adaptive capacity in the motor starting process. According to the method, frequency domain features are extracted by adopting CNN of a multi-scale convolution kernel, dynamic changes of a time sequence are captured in combination with Bi-LSTM, and an attention mechanism is introduced to dynamically weight key transient signals, so that comprehensive modeling and optimization of harmonic signals on frequency domain, time domain and transient features are realized; and an efficient closed-loop dynamic optimization system is constructed by further combining the global search capability and the real-time error feedback mechanism of the genetic algorithm. The method can adaptively capture the key change when the working condition suddenly changes, correct the harmonic injection parameters in real time, significantly reduce the power loss caused by torque fluctuation and high-frequency harmonic in millisecond response, and improve the stability of harmonic injection and the energy efficiency optimization effect.

The invention discloses a three-phase SRM current partition planning method based on a switch type Hall position sensor, and relates to the technical field of motor control, and the method comprises the steps: if a rotor is in a Hall sector with only one phase of torque consistent with the given total output torque direction of a motor, only the phase is conducted, the given current of the conducted phase does not change along with the position of the rotor, and the current of the conducted phase does not change along with the position of the rotor; determining a given current of the conduction phase by taking the same size of the sector average torque of the conduction phase and the given total torque as a target; if the rotor is in a Hall sector in which only one phase of torque is opposite to the given total output torque of the motor in direction, injecting high-frequency pulse current into the winding of the phase, and estimating the position of the rotor according to a pulse peak value, so as to determine the given torque of the other two phases and further determine the given current of the other two phases; according to the method, the rotor position is estimated in the sector, sensitive to the rotor position, of the conduction phase torque, and the conduction phase current curve is planned in real time, so that the torque ripple is inhibited.

A motor control device controls energization of a motor by vector control, the motor control device including: a current command value calculation unit configured to generate current command values in a dq coordinate system based on a command value of a motor; a current command value limit unit configured to limit the current command values in the dq coordinate system which are generated by the current command value calculation unit and output current limit command values which are the limited current command values in the dq coordinate system; and a controller configured to calculate voltage command values for the motor by feedback control of the current limit command values, in which the current command value limit unit limits the current command values in the dq coordinate system such that an operation point having a set voltage margin with respect to a voltage limit circle in the dq coordinate system is obtained based on a direct current bus voltage and the voltage command values.

The invention discloses a motor multi-parameter identification method based on sampling noise excitation and bias compensation, and the method comprises the steps: firstly obtaining the voltage and sampling current of a motor, and enabling the sampling current to comprise sampling noise; then constructing an information evaluation index, and adjusting a proportional parameter of a current controller to improve the identification information amount; then, shaft voltage feed-forward compensation is constructed to suppress electromagnetic torque pulsation; recursion is carried out by adopting a least square method based on the discrete linear parameterization model to obtain a parameter initial value and a covariance matrix; secondly, estimating offset-containing parameters on line, and calculating a sampling noise variance by using an estimated residual error; and finally, obtaining unbiased parameter estimation according to bias compensation iteration updating so as to output online estimation values of stator resistance, direct-axis inductance Ld, quadrature-axis inductance Lq and permanent magnet flux linkage.

The invention discloses a torsional vibration suppression strategy for an electric drive system based on a double-layer model predictive control, and relates to the technical field of electric vehicle motors. The invention establishes a mathematical model of a permanent magnet synchronous motor taking into account the dynamic characteristics of the motor based on a stator voltage equation in a d-q coordinate system; based on the dynamics of a gear system, a 19-degree-of-freedom gear transmission system model is established taking into account nonlinear factors such as time-varying meshing stiffness, meshing error, and tooth side clearance; based on the model of the electric drive system, a torsional vibration suppression strategy based on a double-layer model predictive control is proposed, which suppresses the torsional vibration of an integrated electric drive system by controlling the motor target torque and reducing current harmonics and torque fluctuations, thereby enhancing the stability of the electric drive system and improving the comfort of the whole vehicle.

The invention discloses a multi-target intelligent optimization efficient control method for a cascaded multilevel electric drive system, and the method comprises the steps: constructing a motor broadband domain loss model and a converter loss model, and obtaining an electric drive system loss model after unifying current variables; deriving a motor torque ripple model taking a specific secondary current harmonic component as a component based on a magnetic field modulation principle; establishing an electric drive system loss multi-objective optimization model which takes a fundamental current angle and a specific harmonic current component as two-dimensional optimization variables and takes torque ripple performance into account; and performing particle optimization configuration in the two-dimensional optimization variables of the fundamental current angle and the specific harmonic current component by applying a particle swarm algorithm, solving the multi-objective optimization model, and obtaining the optimal fundamental current angle and the optimal harmonic current component setting. According to the method, the multi-target and multi-dimensional complex problem of the electric drive system is solved by adopting the particle swarm optimization, global optimization can be carried out from the multi-control-dimension angle, and the defect that a traditional optimization algorithm is converged to a local optimal point is overcome.