372results about "Torque ripple control" patented 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.

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 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 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

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

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.

This invention discloses a torque-stable two-phase brushless DC motor and its control method. The two-phase brushless DC motor includes a stator and a rotor. The stator includes a stator core and 4*n stator windings surrounding the stator core. The rotor includes a rotor core and 6*n permanent magnet poles surrounding the rotor core, where n is a positive integer, and adjacent permanent magnet poles have opposite polarities. This invention features high stator winding utilization efficiency, reduces the weight of the brushless DC motor, and exhibits low torque ripple, making it suitable for applications requiring continuous power output.

A drive device (4) for driving an AC motor (1) by an inverter (11) comprises: a current detection unit (12) for detecting a current flowing through an AC motor; a rotor position calculation unit (14) for calculating rotor position information that represents the position of a rotor included in the AC motor; a voltage command determination unit (15) for determining a voltage command on the basis of the current vector of the current and the rotor position information; a beat-less control unit (18) for suppressing the pulsation of a current caused by the periodic pulsation of a DC bus voltage by operating the voltage phase of the voltage command; and a resonance detection unit (20) for detecting the inductor-capacitor resonance between the inverter and an AC power supply (5) for supplying power to the inverter. The beat-less control unit reduces the operation amount of the voltage phase when the inductor-capacitor resonance is excited.

The invention relates to a control method for an electric motor (10), in particular a brushless DC motor, preferably a permanent-magnet-excited synchronous motor, comprising a stator (14) having at least one coil (12) and comprising a rotor (18) having at least one permanent magnet (16), which rotor, during operation, is rotated relative to the stator (14), and comprising an open- and / or closed-loop control unit (20), in particular a microprocessor, by means of which, depending on a rotational angle (22) of the rotor (18) to the stator (14), an output voltage (24) for driving the rotor (18) is specified. It is proposed that the output voltage (24) is specified such that a harmonic coil current (28) flowing during operation, in particular in addition to a basic oscillation coil current, is set at least substantially to a value determined in at least one calibration step (30).

This invention discloses an anti-interference commutation control method and system for a brushless DC motor, belonging to the field of motor control technology. The method includes: S1. Acquiring historical commutation time intervals of the motor and predicting the motor speed and the theoretical time of the next commutation based on the historical commutation time intervals; S2. Using the predicted theoretical time of the next commutation as the time anchor point, opening an adaptive sampling window in advance, wherein the opening time and duration of the adaptive sampling window are calculated based on the predicted motor speed and the theoretical time of the next commutation; S3. During the opening of the adaptive sampling window, activating the acquisition, latching, and state determination of Hall signals; S4. If a valid transition of the Hall signal is captured in step S3, performing a commutation operation based on the valid transition; and closing the adaptive sampling window after the commutation operation is completed. This invention ensures the dynamic response performance and operational stability of the motor across the entire speed range through active interference avoidance in the time dimension.

A drive device (4) that drives an alternating current motor (1) by means of an inverter (11) includes a current detection unit (12) that detects the current flowing through the alternating current motor, a rotor position calculation unit (14) that calculates rotor position information, which is information on the position of the rotor of the alternating current motor, a voltage command determination unit (15) that determines a voltage command based on the current vector of the current and the rotor position information, and a beatless control unit (18) that suppresses pulsation of the current caused by periodic pulsation of the DC bus voltage by operating the voltage phase of the voltage command. The beatless control unit has a power factor information calculation unit that calculates power factor information, which is information on the power factor of the alternating current motor, and operates the voltage phase based on the power factor information and the pulsation component of the norm of the current vector.

The invention discloses a five-phase high-speed permanent magnet synchronous motor model predictive control method based on continuous modulation, belongs to the technical field of multi-phase motor control, and aims to solve the problems of poor control precision, large current harmonic wave, large torque pulsation and low power consumption during high-speed operation of a five-phase high-speed permanent magnet synchronous motor in traditional finite set model predictive control. And a PI controller is slow in dynamic response and easy to saturate. The method comprises the following steps: firstly, synthesizing virtual voltage vectors without projection in a third harmonic space to form a control set; then, based on the time current sampling values, optimal and suboptimal vectors are screened out from the time current sampling values, and an intermediate synthesis vector is generated by calculating the angle and amplitude adjustment duty ratio so as to predict the time current; then, taking the predicted value as a new sampling value, re-executing the screening and action time calculation steps, and calculating a final synthetic voltage vector; and finally, decomposing the vector into the action time of the basic vector of the inverter and generating a switching signal.

A wound-field rotating electric machine (40) includes: a stator (50) including a stator winding (52); and a rotor (60) having magnetic poles aligned in a circumferential direction and a field winding (70) provided for each of the magnetic poles. A controller (30) includes a control unit and an acquisition unit. The control unit controls a stator current through the stator winding and a field current through the field winding. The acquisition unit acquires a rotation parameter that indicates a rotation state of the rotor. When the rotor is in a high-rotation state in which a rotation speed of the rotor is higher than a predetermined rotation speed, the control unit controls the field current to be larger than in a state not being the high-rotation state, and controls the phase of the stator current to a field-weakening phase that weakens a field flux of the field winding.

An aircraft turbomachine (T) comprising an electric machine 1 connected to a transmission line 2 and a control device 3 to determine the current in the electric machine so that it provides an electric

A method of operating an inverter for a brushless direct current (BLDC) motor includes: driving a high-side switch to conduct current between a DC high node and an output node connected to the BLDC motor and for a conductive period in each of a plurality of operating periods; driving a low-side switch to a conductive state after a dead-time after the conductive period and to conduct current between the output node and a DC low node; receiving a duty cycle command; determining an adjusted duty cycle representing the conductive period as a portion of an operating period; determining a duty cycle difference signal as a difference between an initial duty cycle based on the duty cycle command, and the adjusted duty cycle; and determining a feedback duty offset signal based on the duty cycle difference signal. The adjusted duty cycle is computed based on the feedback duty offset signal.

An electric machine system includes an electric machine, an electric power converter, and a control unit. The electric machine includes a stator that includes coils, and a rotator that includes a magnet and is rotatable with respect to the stator. The electric power converter inputs electric power with respect to the coils of the electric machine. The control unit controls the electric power converter. The control unit includes an output unit and a correction unit. The output unit outputs a control signal for operating the electric power converter to the electric power converter. The correction unit corrects a phase of the control signal that determines input timing of the electric power with respect to the coils of the electric machine. The correction unit corrects the phase so that the magnitude of the electric power approaches an extreme value.

The application relates to the technical field of motor control, in particular to a control method, device and system applied to a permanent magnet synchronous motor. The application obtains pulsation stability according to the difference between electromagnetic data in a preset time window of an adjacent reference time before the current time and the difference between electromagnetic data variation trends, and obtains an adjustment degree according to the duration of the electromagnetic data variation trend at the time before the current time and the abnormality degree of the electromagnetic data; according to the pulsation stability and the adjustment degree at the current time, a predicted value of the electromagnetic data at the time after the current time is obtained by using a particle filtering algorithm, and then a possible adjustment time of the current time is determined, and the inverter controls the permanent magnet synchronous motor before the possible adjustment time. The application analyzes the stability degree and the adjustment degree of the electromagnetic data at the current time to determine the possible adjustment time, controls the permanent magnet synchronous motor in advance, effectively reduces overshoot and pulsation, and improves the control effect on the permanent magnet synchronous motor.

A pulsation suppression device (200) for suppressing mechanical or electrical pulsation in an electromechanical system (100) having a power supply circuit (101), a motor (102), and a mechanical device (103) includes a pulsation extraction unit (205) for separating and extracting periodic pulsation of a periodic disturbance occurring in the electromechanical system into cosine and sine components, a rotation amount adjustment unit (206) for determining the amount of rotation when performing a rotation operation on the cosine and sine components, a rotation calculation unit (202) for performing a rotation operation on the cosine and sine components by the amount of rotation, an integral control unit (203A) for integrating the cosine components after the rotation operation, an integral control unit (203B) for integrating the sine components after the rotation operation, and an AC restoration unit (204) for restoring the integrated cosine and sine components to AC signals based on a disturbance frequency, which is the pulsation frequency of a DC bus voltage of the power supply circuit, and outputting the restored signal, and the rotation amount adjustment unit adjusts the amount of rotation so that the periodic pulsation is reduced.

A drive unit for driving a load, such as a centrifugal compressor, a pump, etc., having a driving shaft is connected to the load to be driven. The drive unit includes a number of electric motors connected to the driving shaft and a number of variable frequency drives electrically connected to a power grid (G) used to power each of the electric motors.