496results about "Torque ripple control" patented technology

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 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 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.

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.

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 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.

The invention relates to the technical field of brushless motor driving, and discloses an FOC-based brushless motor adaptive mute driving system. The system comprises a state partition module, a strategy mapping module, a parameter combination module, an exception updating module and a drive management module. The state partition module collects original electrical signals of the motor, identifies operation state characteristics in combination with control parameters and divides state partitions; the strategy mapping module obtains a pre-stored drive control strategy set and constructs a mapping relation between state partitions and strategies; the parameter combination module extracts key operation parameters, calculates a control parameter association matching degree and generates a parameter deviation combination; the exception updating module verifies the strategy set in real time, identifies exception features and updates the mapping relation; and the driver management module identifies target parameters and execution priorities according to the updated mapping relationship, and generates a mute driver monitoring strategy library. The system can adjust the control strategy in a self-adaptive mode, and the operation mute performance of the brushless motor is improved.

The invention relates to a permanent magnet synchronous motor speed regulation control method based on an iterative terminal sliding mode algorithm, and the method comprises the steps: building a mathematical model of a permanent magnet synchronous motor in a synchronous rotating coordinate system, and enabling the mathematical model to be a calculation formula of a derivative of stator current and rotor angular speed; constructing a state equation of a motor rotating speed tracking error based on the rotor angular speed and the rotor expected angular speed; designing a traditional nonsingular terminal sliding mode surface based on the rotating speed tracking error in the state equation and the derivative of the rotating speed tracking error, and replacing a traditional function in the traditional nonsingular terminal sliding mode surface with a non-smooth function to obtain an improved nonsingular terminal sliding mode surface; based on the state equation and the improved non-singular terminal sliding mode surface, constructing a non-singular terminal sliding mode controller which enables the rotating speed tracking error of the permanent magnet synchronous motor system to converge to an original point on the non-singular terminal sliding mode surface, and controlling the permanent magnet synchronous motor based on the non-singular terminal sliding mode controller; the problem that the torque pulsation phenomenon exists when the permanent magnet synchronous motor operates is solved.

The invention discloses an energy-saving operation control method and system for a permanent magnet direct current pump motor, and relates to the technical field of motor control, and the method comprises the steps: collecting a first drive current signal and a back electromotive force signal of the permanent magnet direct current pump motor; if a periodic peak and an electrical angle concentration phenomenon exist in the first driving current signal, performing quality evaluation on the back electromotive force signal to obtain back electromotive force credibility; if the back electromotive force credibility is greater than a preset credibility threshold value, applying operation parameter disturbance to the permanent magnet direct current pump motor; acquiring a second driving current signal of the permanent magnet direct current pump motor; performing disturbance response feature extraction on the permanent magnet direct current pump motor to obtain disturbance response features; identifying a disturbance source; and adjusting the operation strategy of the permanent magnet direct current pump motor to control the motor to operate. According to the method, the disturbance source can be recognized by combining the operation parameter disturbance and the disturbance response characteristics, the operation strategy is adjusted, motor operation control is achieved, and accuracy and reliability are improved.

The present application relates to the technical field of new energy vehicles and provides a motor jitter suppression control method, system and vehicle. The method comprises: acquiring wheel speed information of a vehicle and calculating a jitter amount of a wheel speed based on the wheel speed information; acquiring motor actual torque and calculating a torque difference between the motor actual torque and motor target torque; and activating a jitter control module to perform jitter control in response to the wheel speed of the vehicle falling below a set wheel speed, an absolute value of the jitter amount exceeding a calibration threshold and the torque difference equaling zero, wherein performing the jitter control comprises: acquiring compensation torque based on the jitter amount and controlling a motor to output the compensation torque to suppress jitter of a motor speed. Accordingly, the technical solution of the present application enables the proactive execution of motor jitter control by automatically recognizing road excitations and intelligently determining the conditions for executing jitter control, thereby effectively reducing vehicle vibrations, decreasing vehicle noise levels and enhancing ride comfort.

The invention discloses a dynamic working condition data flow-oriented brushless motor driving adjustment method and system. The method relates to the technical field of brushless motor driving adjustment, and comprises the following steps: dynamic response quantification, dynamic response optimization, driving stability quantification and driving stability optimization. Whether dynamic response optimization is carried out or not is judged according to the obtained working condition switching dynamic response value, if yes, brushless motor driving adjustment is carried out after dynamic response optimization is qualified, if not, brushless motor driving adjustment is directly carried out, and the brushless motor driving stable value is obtained according to quantization of the obtained driving stable parameters. According to the brushless motor driving stable value, whether motor driving stability optimization is carried out or not is judged, so that the brushless motor driving adjustment stability in high-load working condition switching of a product based on brushless motor driving is improved; the problem that the brushless motor driving adjustment stability is low due to control output fluctuation in the high-load working condition switching process of a product based on brushless motor driving is solved.

The invention relates to the technical field of motor driving, and discloses a brushless motor non-inductive FOC driving method and device, and the method comprises the steps: collecting a first three-phase stator current and a bus voltage of a brushless motor, and calculating a rotor position estimation value; performing coordinate transformation on the first three-phase stator current to obtain a first d-axis actual current and a first q-axis actual current, and calculating a first d-axis current error and a first q-axis current error; calculating a d-axis first-order integral value, a d-axis double-integral accumulated value, a q-axis first-order integral value and a q-axis double-integral accumulated value, and constructing a d-axis double-integral sliding mode surface and a q-axis double-integral sliding mode surface; according to the method, a d-axis compensation voltage instruction is generated based on the d-axis double-integral sliding mode surface, a q-axis compensation voltage instruction is generated based on the q-axis double-integral sliding mode surface, the d-axis compensation voltage instruction and the q-axis compensation voltage instruction are applied to the brushless motor, the problem of magnetic field orientation deviation caused by position estimation lag in non-inductive FOC driving is solved, and the output efficiency of the motor is improved.

The disclosure relates to a four-phase motor and generator device with increased efficiency for generating electrical energy. The device features a stator wall with eight stator slots and four pole groups, and an armature rotatable within the stator wall. The eight stator slots are divided into four pole groups of opposing stator slots; the two opposing stator slots include an N (North) stator slot and an S (South) stator slot. N and S stator slots are alternatively activated in response to the rotation of the armature. The activation of the armature pole groups results in armatures rotating the magnetic field within the stator wall, and only four of the eight poles are actively coupled in any given configuration. The disclosure also includes a method of operating the motor for generating electrical energy with increased efficiency and in an environmentally friendly manner compared to conventional motors.

The invention discloses an efficient brushless motor cogging tension compensation method, which comprises the following steps of S1, performing compensation initialization on a motor, and setting a target electrical angular velocity of the motor; s2, recording initial position information of the motor during rotation through an encoder for performing compensation process state judgment; s3, a PID controller is used for calculating a target voltage value needed for enabling the motor to rotate according to the target electrical angular speed, encoder data is used as an index, and the motor voltage needed for compensating the cogging tension in the lowest operation state of the motor is recorded and stored; according to the method, external equipment is not needed, data are obtained completely by means of a control system and an internal sensor of the motor, such as an encoder of the motor, and compensation is achieved through an optimized algorithm and control logic through a tooth groove tension calibration method. The whole compensation process can be completed in the motor control system, and expensive and complex external equipment does not need to be additionally added.

The invention discloses a torque ripple suppression method for a permanent magnet synchronous motor under a limited voltage, and belongs to the technical field of power generation, power transformation or power distribution. The method comprises the following steps: acquiring torque data changing along with a rotor position under different excitation currents, and establishing a torque three-dimensional look-up table model of the torque about a shaft current and the rotor position; respectively establishing optimization targets for a low-rotating-speed working condition and a high-rotating-speed working condition, and establishing a stator current two-dimensional table look-up model under the low-rotating-speed working condition and a stator current three-dimensional table look-up model under the high-rotating-speed working condition in combination with the torque three-dimensional table look-up model; an optimized stator current algorithm model is established according to the stator current look-up table model, the stator current two-dimensional look-up table model or the stator current three-dimensional look-up table model is switched according to the criterion of direct current voltage out-of-limit, and the query value of the optimized stator current is used as a stator current reference value for vector control of the permanent magnet synchronous motor. While low-speed copper loss reduction and high-speed speed regulation range expansion are taken into consideration, overall torque harmonic suppression under a voltage limited working condition is realized.

Disclosed in the present application are an electric-motor torque compensation method, apparatus and device, and a storage medium and a product. The method comprises: collecting the present input current when an electric motor runs, and determining the present ripple value of the present input current; on the basis of the present ripple value, determining a target filtering coefficient for filtering the present input current; on the basis of the target filtering coefficient, determining an electric-motor zero-point compensation value; and on the basis of the electric-motor zero-point compensation value, compensating for an electric-motor torque.

Control device (3) for controlling an electric power steering device (4) which uses a three-phase synchronous motor (2) as a power assistance during a steering operation, comprising the following a rotation position estimation unit (16) that estimates a position of a rotor of the three-phase synchronous motor (2) on the basis of a neutral point potential or a potential of a virtual neutral point of the three-phase synchronous motor (2), and a command signal calculation unit (17) which calculates a command signal to the three-phase synchronous motor (2) on the basis of the position of the rotor which is estimated by the rotation position estimation unit (16), wherein a position signal, detected by a rotary position detector (21) which detects the position of the rotor of the three-phase synchronous motor (2), is input to the control device (3), the command signal calculation unit (17) calculates a command signal to the three-phase synchronous motor (2) either on the basis of the position of the rotor detected by the rotation position detector (21) or the position of the rotor estimated by the rotation position estimation unit (16) and The command signal calculation unit (17) then, when the position signal is abnormal, calculates the command signal to the three-phase synchronous motor (2) on the basis of the position of the rotor, which is estimated by the rotation position estimation unit (16), and wherein Then, when the position of the rotor detected by the rotary position detector (21) generally matches the position of the rotor estimated by the rotary position estimation unit (16), a calculation of the command signal to the three-phase synchronous motor (2) based on the position of the rotor detected by the rotary position detector (21) and a calculation of the command signal to the three-phase synchronous motor (2) based on the position of the rotor estimated by the rotary position estimation unit (16) are exchanged.

The application discloses a high-precision model prediction current control system and control method of a double three-phase motor, and relates to the technical field of multiphase motor control. The application extends the traditional 12 virtual voltage vector control set, designs 24 virtual voltage vectors with equal amplitude and uniform phase angle under the premise of not losing voltage utilization rate, and improves control precision. A duty cycle calculation method based on minimum error is proposed, which can track the currents of d-axis and q-axis at the same time even in the case of a single effective virtual voltage vector, and guarantees optimal output duty cycle. In addition, the process of traversing all voltage vectors in the prediction control is simplified, and the calculation burden of the algorithm is reduced. The application improves the precision of model prediction control by extending the control set and reducing the calculation error of the duty cycle, reduces 5th and 7th harmonics, and improves torque ripple. Moreover, even under the action of 24 voltage vectors, the calculation amount is still low, and the execution efficiency of the algorithm is improved.

To provide a motor control unit capable of effectively suppressing torque ripple even when a torque command value close to the upper limit of an output current is given.SOLUTION: A motor control unit 1 includes: a torque ripple compensation value calculation unit 12 that calculates a torque ripple compensation value 25 for compensating a torque ripple generated on a motor 4 based on an electrical angular velocity 24 and a torque command value 21 of the motor 4; a ripple amplitude upper limit calculation unit 14 that calculates a ripple amplitude upper limit 27 as the upper limit for the amplitude of the torque ripple compensation value 25 based on the torque command value 21 and the torque upper limit 26 set for the motor 4; and an amplitude adjustment unit 15 that adjusts the amplitude of each frequency component in the torque ripple compensation value 25 based on the ripple amplitude upper limit 27 and calculates a torque ripple compensation value 28 after amplitude adjustment.SELECTED DRAWING: Figure 1

The present invention discloses a method for suppressing harmonics and torque ripple in model-free predictive control of a permanent magnet synchronous motor. The method comprises the following steps: sampling physical information of the permanent magnet synchronous motor; performing a Clarke transform on the obtained three-phase current, and then performing a Park transform on the sampled rotor position to obtain the actual current along the dq axes; updating an ESO-based hyperlocal model after forward Euler method discrete transformation based on the obtained actual current along the dq axes and the motor winding voltage; calculating a control voltage using a traditional deadbeat current control method based on the calculated disturbance update value; and performing an inverse Park transform on the calculated deadbeat control voltage, followed by traditional SVPWM modulation, to obtain a three-phase PWM waveform, which is input into a driver to control the permanent magnet synchronous motor. The method can significantly reduce current ripple and torque ripple in the model-free predictive control of the permanent magnet synchronous motor, significantly reduce high-frequency harmonics during motor operation, and reduce the computational burden.

To suppress occurrence of a torque step difference of a motor in switching between one-side driving mode and both-side driving mode.SOLUTION: A driving device controls first and second inverters based on d-axis and q-axis current commands based on a torque command of a motor in one-side driving mode in which only one of the first and second inverters is driven or in both-side driving mode in which both the first and second inverters are driven. In this case, in one-side driving mode, the d-axis and q-axis current commands are set using the torque command and a first current command map, and in both-side driving mode, the d-axis and q-axis current commands are set using the torque command and a second current command map, where the first and second current command maps are determined such that the same torque is output for the same torque command.SELECTED DRAWING: Figure 3

A method for magnetizing a soft magnet in a rotor of a variable flux memory motor (VFMM) includes generating a first pulse of current having a duration of greater than or equal to 0.1 milliseconds (ms) and less than or equal to 2 ms, and applying the first pulse to a stator winding of the VFMM to set the magnetization state of the soft magnet to a first magnetization state.

The invention relates to a method for controlling an inverter which is electrically connected to an electric motor, having the following steps: defining a modulated voltage (S1) for the inverter, said voltage being based on a first switching frequency, for operating the electric motor with a current, wherein the current has an electric frequency; determining the electric frequency (S2); changing the first switching frequency (S4) on which the modulated voltage is based to a second switching frequency if a value pair consisting of electric frequency and first switching frequency, or a value pair consisting of electric frequency and a sideband of the first switching frequency, is within at least one defined disturbance range (S3).

The present application relates to a system and method for raising a battery temperature using a motor driving system, the system for raising a battery temperature comprising: an inverter including a plurality of branches, each branch including a pair of switching devices connected in series with each other between both ends of a battery, the plurality of branches respectively corresponding to a plurality of phases; a motor including a plurality of windings respectively corresponding to the plurality of phases, one end of each winding of the plurality of windings being connected to a connection node between the pair of switching devices included in a corresponding branch, the other end of the plurality of windings being connected to each other; and a controller configured to select two phases among the plurality of phases, and alternately control on / off states of the switching devices included in two branches in the inverter corresponding to the selected two phases at a predetermined switching frequency, to generate alternating current (AC) supplied to the battery.