424results about "Current controllers" patented technology

The invention provides a cross-coupling cooperative control method for double permanent magnet synchronous motors of an aviation airborne suspension lifting system. The cross-coupling cooperative control method comprises the following steps: acquiring a global instruction and real-time state feedback of the double motors; based on the global instruction and the real-time state feedback, constructing a dynamic topology and dynamically adjusting the weight to obtain the weight of the dynamic topology; generating a collaborative correction based on the weight of the dynamic topology and a consistency protocol; dynamic error balanced distribution under load disturbance is carried out based on the collaborative correction amount; and controlling the double motors based on an error balanced distribution result. According to the method, dynamic weight distribution and dynamic error balanced distribution are combined, multi-source interference working conditions such as mechanical unbalance loading, dynamic coupling and parameter disturbance can be dealt with, synchronous errors and disturbance fluctuation in a dual-motor system can be accurately monitored and coordinated, and high-precision stability of cooperative driving is guaranteed.

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.

According to the pure hardware PID current control system and method based on the direct current brushless motor provided by the invention, the negative voltage interference generated by electromagnetic induction is directly filtered in the bus current signal acquisition stage through the cooperation of the current sampling module and the bus negative voltage elimination module; the problem of signal distortion caused by negative voltage in a traditional sampling circuit is eliminated, and the current effective value detection precision is improved; the PID control module constructed based on pure hardware calculates a difference value between a target voltage and an actual voltage in real time through an analog circuit, and generates a proportional, integral and differential composite compensation signal, so that a PWM modulation circuit can adjust duty ratio output in real time according to the compensation signal, and it is ensured that a bus current of a motor driver is rapidly converged to a target value; the whole scheme does not need to depend on a microcontroller and a complex software algorithm, closed-loop current control is achieved through discrete devices, and the system cost is reduced.

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 provides a control method of a servo motor and an actuator. According to the control method, firstly, a servo motor is controlled to determine a first mechanical rotation amount according to a first current input logic, then the servo motor is controlled according to a second current input logic, so that a rotor moves towards a target phase searching direction, and a second mechanical rotation amount is determined; and finally, according to the first mechanical rotation amount, the second mechanical rotation amount and the theoretical mechanical rotation amount in the second current input logic, the phase-finding rotation deviation is determined, and the servo motor is controlled according to the phase-finding rotation deviation, so that the situation of galloping or stalling of the actuator caused by phase-finding failure due to hard limiting blocking of the actuator is avoided. Therefore, the control precision of the servo motor is improved, and the safe operation of the actuator is ensured.

The invention discloses an improved multi-vector combined model predictive control method and device for a permanent magnet synchronous motor. The method comprises the following steps: acquiring a three-phase current of each sampling period, and converting the three-phase current into a d-axis current and a q-axis current; performing one-beat delay compensation on the current, predicting a reference voltage of a next beat, and judging a sector where the reference voltage is located; selecting a corresponding voltage vector output combination in the reconstructed voltage vector selection table by combining the sector and the previous period zero vector; solving a cost function only containing voltage vectors and action time by using the KKT theorem, and calculating the action time of each voltage vector; and generating a pulse signal according to the action time for driving the output of an inverter of the permanent magnet synchronous motor. According to the method, the advantages of fast dynamic response, easy processing of multiple constraints and the like of model prediction control are maintained, and meanwhile, lower calculation complexity, fixed switching frequency and higher reliability are realized, so that the comprehensive performance of a permanent magnet synchronous motor control system is improved.

The invention discloses a brushless motor control system and control method, and belongs to the technical field of motor control and driving. Comprising a real-time detection module, a control, regulation and control analysis module and a self-adaptive compensation module, multi-source operation data of the brushless motor are collected in real time, the control, regulation and control analysis module carries out depth correlation analysis, potential characteristics such as parameter sensitivity, observer coupling degree and stability attenuation index are mined, potential influences are quantified through analog simulation, and a comprehensive influence value is obtained. And the self-adaptive compensation module intelligently selects a compensation type according to the numerical value, calculates an accurate compensation data value, and performs dynamic closed-loop correction on controller parameters. According to the method, the problems of insufficient adaptive capacity and compensation lag caused by difficulty in coping with parameter time variation and potential coupling in the prior art are solved, the conversion from passive response to active prevention is realized, and the robustness, the control precision and the long-term operation stability under complex working conditions are improved.

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 control, and discloses a motor optimization control method and system based on q-axis voltage control, and the method comprises the steps: carrying out the Clark-Park conversion and sliding mode observation of a three-phase current signal and a three-phase voltage signal, and obtaining a d-axis current signal, a q-axis current signal, a d-axis flux linkage component and a q-axis flux linkage component; performing recursive least square identification processing to obtain a real-time salient pole ratio value; reluctance torque angle arc tangent calculation and d-q axis coupling quantity product operation are carried out to obtain reluctance torque coupling disturbance quantity; according to the method, the limitation that in the prior art, work is only carried out near an MTPA curve is broken through, the adverse effect of d-q-axis cross coupling on q-axis voltage control precision is effectively eliminated, and the control precision of the q-axis voltage is improved. And the torque output capability and the dynamic response performance of the motor under various working conditions 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 invention provides an MRAS permanent magnet synchronous motor parameter online identification method based on BP neural network optimization, and the method comprises the steps: constructing two BP neural network models, carrying out the offline training optimization of the two models, and obtaining an optimal neural network model which can accurately predict the flux linkage of a rotor and the inductance of a stator; based on an MRAS step-by-step identification strategy, two-stage motor parameter step-by-step identification units are built, the two optimal neural network models are embedded into the corresponding motor parameter step-by-step identification units, and based on the problem that the stator resistance identification effect of the BP neural network is poor, the two optimal neural network models are embedded into the corresponding motor parameter step-by-step identification units; according to the invention, the BP neural network and the adaptive rate unit are established in the second MRAS parameter identification unit, and the online dynamic identification of the stator resistance and the stator inductance is realized through the combination of the BP neural network and the adaptive rate unit. According to the method, an off-line training-on-line identification mode is adopted, the complex parameter setting process in a traditional method is avoided, the identification efficiency is remarkably improved, and the identification result is accurate.

An electrically powered aircraft is configured to reboot its motor(s) while in flight when the motor(s) are deenergized and / or stop spinning. A controller may receive one or more measurements associated with the motor, such as phase voltage measurements. The phase voltage measurements may be used to determine a position or angle of the motor, such as the position of the rotor of the motor to the stator of the motor. The phase voltage of the motor arises due to back-EMF from the spinning, but unpowered, motor. The motor position can then be used to by the controller to synchronize an inverter and provide synchronized command signals to the motor to restart the motor. If the motor is not spinning or not spinning fast enough to reliably determine its position, then an open-loop start may be used to spin up the motor prior to measuring the phase voltages for synchronization.

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 relates to the technical field of electro-hydrostatic actuators, and discloses an EHA driving and control integrated device based on a three-in-one integrated framework, which comprises a power conversion main loop part, a control auxiliary part and a motor M which are connected with one another, the power conversion main loop part comprises a soft start + capacitor, a SiC power component and a common mode inductor, the soft start + capacitor, the SiC power component and the common mode inductor are sequentially connected and are all connected with the control auxiliary part, and the common mode inductor is connected with the motor M; the control auxiliary part comprises an upper computer, an auxiliary power supply, an EHA controller and an actuator; the EHA controller is respectively connected with the upper computer, the auxiliary power supply, a soft start + capacitor, a SiC power assembly, the actuator and a motor M; according to the invention, the motor driving module, the EHA controller and the state monitoring module are integrated in a single shell, precise regulation and control from outside to inside are realized by adopting a three-closed-loop control architecture, the response delay of the system is reduced, and the advantages of compactness, high power density and quick response brought by integration, standardization and efficient heat dissipation design are highlighted.

A transfer system includes a drive unit that supplies drive currents to coils disposed along a transfer path, a thrust command generation unit that generates a thrust command that is the command value of a thrust to be produced by a mover, based on a motion target value that is a time-series motion target value, and a current command generation unit that generates, as current commands, current target values that are the target values of the drive currents to be provided to coils so that the thrust produced by the mover follows the thrust command. The current command generation unit generates the current target values to be provided to coils, using part of an actual thrust characteristic determined by the characteristics of the plurality of coils and the mover, so as to reduce the number of the coils through which the drive currents flow.

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.

The present disclosure relates to a motor assembly, and more particularly, to a motor having a two-phase input power source and a power conversion device for driving a two-phase motor. The present disclosure relates to the motor assembly for driving the two-phase motor, the motor assembly configured to comprise: a motor including a first winding and a second winding having an electrically insulated parallel structure; a DC-link circuit for supplying a direct-current voltage; and an inverter connected to the DC-link circuit to convert the direct-current voltage into an alternating-current voltage to drive the motor, and including a first switching element set connected to the first winding and a second switching element set connected to the second winding.

The invention discloses a control method, a circuit and a driving mechanism of an underground three-phase brushless motor, and the control method achieves the high-adaptability control of an underground extreme working condition through fuzzy intelligent decision, directly generates a PWM duty ratio through the fuzzy reasoning taking the current deviation and change rate as the input, can rapidly inhibit the sudden change of a load, improves the response speed, and improves the reliability of the system. PID is combined with fuzzy control, so that a good control effect on nonlinearity, time-varying property and uncertainty of a controlled object can be achieved; in the driving mechanism, a driving combination composed of a three-phase brushless motor and a planetary gear reducer is connected with a transmission shaft through a flexible coupler, so that violent vibration impact of the driving mechanism in an oil well is reduced, the peak load of the driving mechanism is reduced, and the reliability of the driving mechanism is improved; and the wires are prevented from being broken in the assembly process.

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.

Disclosed are systems and methods for motor control using optimal efficiency reference generation. An electronic controller can determine current values of a motor in a rotating reference frame. Each current value can be associated with a dimension of a set of dimensions of the rotating reference frame. The electronic controller can further determine flux linkage values for each dimension of the set of dimensions of the rotating reference frame based on the current values using an optimization cost function that accounts for motor speed, copper loss, and core loss. The electronic controller can further determine target flux linkage values for each dimension of the set of dimensions of the rotating reference frame. The electronic controller can then control a power switch network coupled between a power source and the motor based on the flux linkage values and the target flux linkage values.

A power converter is configured to measure an output current and to determine a multiphase voltage reference as a function of the output current. Within the same switching period the voltage reference is determined, a modulation routine determines a modulation index for each phase of the output voltage. In some instances, one or more phases must start modulation during the switching period before the new modulation index is determined. The modulation routine stores the value of the modulation index generated from the prior switching period and uses the stored value when a new value is not yet ready. An offset value for the phase voltage which used a modulation index from the prior switching period is determined in order to compensate the phase voltages of the other phases and to maintain a desired line-to-line voltage output from the power converter.

The application provides a control method of a servo motor and an actuator. In the control method, first, a first mechanical rotation amount is determined by controlling the servo motor according to a first current input logic, then a rotor is moved to a target phase searching direction by controlling the servo motor according to a second current input logic, and a second mechanical rotation amount is determined, finally, a phase searching rotation deviation is determined according to the first mechanical rotation amount, the second mechanical rotation amount and a theoretical mechanical rotation amount in the second current input logic, and the servo motor is controlled according to the phase searching rotation deviation, so that the situation that the actuator is out of control or blocked due to the hard limit of the actuator is avoided, the control precision of the servo motor is improved, and the safe operation of the actuator is ensured.

To reduce vibration caused by switching energization to a coil.SOLUTION: A drive control device 1 includes: a rotational speed calculation unit 42 that calculates a rotational speed of a motor 20 on the basis of a rotational position detection signal of the motor 20; an energization stop time calculation unit 43 that calculates an energization stop time for stopping energization to all phases of coils Lu, Lv, and Lw of the motor 20 on the basis of a target rotational speed Stg and the rotational speed of the motor 20; and an energization signal generation unit 44 that switches the energization to the coils Lu, Lv, and Lw of the motor 20, and generates an energization signal for controlling the energization of the coils Lu, Lv, and Lw of the motor 20 in order to stop the energization of all the coils Lu, Lv, and Lw of the motor 20 during the energization stop time.SELECTED DRAWING: Figure 1

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.

The invention discloses a ship propulsion six-phase permanent magnet motor model prediction control method, which comprises the steps of S1, establishing a ship propulsion six-phase permanent magnet synchronous motor mathematical model based on a vector space decoupling technology, S2, carrying out vector space decoupling analysis on the ship propulsion six-phase permanent magnet synchronous motor mathematical model, acquiring voltage vector distribution characteristics of two effective control subspaces, namely alpha-beta and x-y; s3, compensating a prediction error caused in a current prediction control process by adopting a delay compensation technology; and S4, optimizing the current prediction value, obtaining an optimal six-way switching signal matched with the target current, inputting the optimal six-way switching signal into a six-phase two-level inverter, and performing a ship propulsion six-phase permanent magnet motor model prediction control process based on virtual voltage vector space modulation. According to the method, the virtual voltage vector control set is pre-synthesized, so that the harmonic current in the x-y plane is effectively suppressed, and the harmonic wave caused by over-excitation current response is suppressed.

To provide a technique capable of holding energization in an electric motor with a simple configuration even after a manual switch for a reciprocating tool is turned off.SOLUTION: A reciprocating tool includes a reciprocating member, an electric motor, a transmission device, a drive circuit, a first manual switch, a switch element and a control circuit. A first contact point of the first manual switch is connected to a power supply, and a second contact point of the first manual switch is connected to the drive circuit. The first manual switch in its on state connects the first contact point to the second contact point. The switch element (i) is turned on when it receives an electric signal, and (ii) establishes electrical continuity between the first contact point and the second contact point in its on state. In response to at least the first manual switch being turned on, the control circuit continues to output the electric signal to the switch element until the drive of the electric motor is stopped.SELECTED DRAWING: Figure 6

The invention discloses an intelligent control system and method for a permanent magnet synchronous brushless motor, and the method comprises the steps: measuring a rotation position signal of a secondary magnetic wheel of a motor rotor through a high-resolution position sensor, and measuring a rotation position signal of a main magnetic wheel of the motor rotor through a low-resolution sensor; detecting whether the position signal increment synchronization between the rotation position signal of the secondary magnetic wheel of the motor rotor and the rotation position signal of the main magnetic wheel of the motor rotor is completed within a set time or not; when the rotation position signal of the secondary magnetic wheel of the motor rotor and the rotation position signal of the main magnetic wheel of the motor rotor complete position signal increment synchronization within a set time, the motor enters a closed-loop control operation mode; the actual rotation position of the motor is determined according to the initial position of the motor and the rotation position signals of the motor rotor secondary magnetic wheel and the motor rotor main magnetic wheel, and the actual rotation position of the motor is adjusted according to the difference value between the actual rotation position of the motor and the target rotation position of the motor to reach the target rotation position of the motor.

The present invention relates to a swiveling device (1) for a vehicle seat (100). Said swiveling device (1) includes a lower and an upper plates (3, 5), a plurality of coils (15) being attached to one of said plates and a plurality of magnets being attached to the other one of said plates. The invention exploits the electromagnetic forces generated by feeding said coils with an electric current for obtaining the relative rotation between the lower plate (3), intended to be attached to the floor of a vehicle cockpit, and the upper plate (5), intended to be attached to the frame of a seat cushion: the electromagnetic thrust generates a torque, which makes the upper plate rotate relative to the lower plate, while the electromagnetic repulsion generates an axial force counteracting the weight of the vehicle seat and of a user sitting on the seat.

Electric motors and methods of controlling electric motors are described herein. The electric motors include a mobile component having at least one permanent magnet coupled thereto and a stator spaced apart from the mobile component. The stator includes at least one stator pole having a ferromagnetic core and a coil wrapped around the ferromagnetic core. The ferromagnetic core is naturally attracted to the at least one permanent magnet. The motors also include a magnetic position control system configured to monitor a position of the at least one permanent magnet relative to the stator and controllably deliver an electric pulse to the coil of each stator pole to generate a repulsive magnetic flux on the ferromagnetic core to cancel an attraction force between the ferromagnetic core and the at least one permanent magnet to control movement of the mobile component.