897results about "Current controllers" patented technology

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

The invention provides a brushless motor multi-axis cooperative control method and system for an industrial robot, and relates to the technical field of control, and the method comprises the steps: processing the real-time parameters of a brushless motor of each joint axis through constructing an extended dynamic model, and obtaining a temperature drift coefficient and a load inertia parameter; a self-adaptive pre-compensation model, a neural network compensator and a recurrent neural network prediction model are combined, a torque control instruction is output, a three-phase current prediction value is calculated, a distributed model prediction controller is adopted to generate an optimal switching sequence, multi-axis cooperative control is achieved, and the system stability and the response speed can be effectively improved.

Disclosed are systems and methods for motor control using piecewise affine modelling. An electronic controller may determine current values for a motor in a rotational reference frame. Each current value may be associated with a dimension of a set of dimensions of the rotational reference frame. The electronic controller may further determine, based on the current values, a flux linkage value for each of the set of dimensions of the rotational reference frame using a piecewise affine map. The electronic controller may further determine a target flux linkage value for each of the set of dimensions of the rotational reference frame. The electronic controller may then control a power switching network coupled between a power supply and the motor based on the flux linkage values and the target flux linkage values.

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 stand-alone motor unit for use with a piece of power equipment includes a housing, an electric motor, a battery pack to provide power to the motor, a battery receptacle arranged on the housing and configured to receive the battery pack, and a control panel arranged on either the housing or the piece of power equipment. The control panel is operable to control operation of the electric motor.

The invention discloses a vehicle-mounted ceiling screen anti-pinch method and device, electronic equipment and a storage medium, and relates to the technical field of vehicles. The method comprises the steps that under the condition that it is determined that the vehicle-mounted ceiling screen is in a starting state, the included angle between the current starting position of the vehicle-mounted ceiling screen and a vehicle roof and the current working current value of a motor used for driving the vehicle-mounted ceiling screen to be started are determined; when it is determined that the degree of the included angle is larger than a first set degree and the current working current value is larger than a first set current threshold value, anti-pinch control operation is conducted on the vehicle-mounted ceiling screen; wherein the first set current threshold value is determined based on a target working current value of the motor after the vehicle-mounted ceiling screen is started for a target set duration. The vehicle-mounted ceiling screen can be accurately and effectively prevented from clamping foreign matters in the starting process, the riding safety of passengers is ensured, and the riding experience of the passengers is improved.

Provided is an electric drum brake system, including: an electric drum brake configured to be driven by an electric motor; a current sensor configured to detect a current input to the electric motor; and a controller configured to, when parking is released, determine a parking release time based on a temperature of the electric drum brake, and when a maintenance time reaches the determined parking release time, end a parking release operation by stopping the electric motor, the maintenance time being a period of time while a state where a motor current detected by the current sensor reaches a target current is maintained.

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.

The invention discloses an intelligent control method and system for a brushless direct current motor and a storage medium, and the method comprises the steps: constructing a mathematical model of a rotating speed and current double-closed-loop speed regulation system of the brushless direct current motor and a simulation model of a control system of the brushless direct current motor, and controlling a rotating speed PID (Proportion Integration Differentiation) controller by using an improved Sabot swarm optimization algorithm; when a set termination condition is met, outputting the global optimal position of the salmons individual corresponding to the population position of the current salmons population, and obtaining a target value of the to-be-optimized parameter according to a solution corresponding to the global optimal position of the salmons individual; controlling the brushless direct current motor based on the target value of the to-be-optimized parameter; according to the method, an improved saloat swarm optimization algorithm is fused with a Gaussian random walk strategy and a warning mechanism of a sparrow algorithm, and a chaotic mapping optimization initial population is introduced and is used for optimizing a fuzzy rule, so that the convergence speed and precision of searching the fuzzy rule are improved, and the problem that parameters of a PID controller are difficult to set is more effectively solved.

An impact power tool includes a housing, a motor, a controller, an impact mechanism configured to be driven by the motor, and an output spindle configured to receive rotational impacts from the impact mechanism to rotate the output spindle. The controller is configured to detect a first impact of the rotational impacts or to detect when the motor speed drops below a speed threshold value. The controller is configured to control the motor to have a first non-zero target rotational speed using closed loop control for a predetermined time period after the first impact is detected or when the motor speed dropping below the speed threshold value is detected. The controller is configured to control the motor to have a second non-zero target rotational speed using the closed loop control after the predetermined time period. The first non-zero target rotational speed is less than the second non-zero target rotational speed.

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.

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

In some examples, this disclosure describes a method that comprises controlling power switches to deliver a current to an electric motor, wherein the power switches are arranged in a bridge (e.g., an H-bridge or an h-bridge) comprising a first high-side power switch, a first low-side power switch, and a second low-side power switch. Controlling the power switches to deliver the current to the electric motor may include controlling the first high-side power switch ON and controlling the second low-side power switch ON, wherein the current to the electric motor flows through the high-side power switch and through the second low-side power switch. The method may comprise determining the current to the electric motor based on a voltage drop over one of the power switches arranged in the bridge.

The invention relates to the field of permanent magnet synchronous motor control, in particular to an RANF adaptive harmonic suppression method based on dustpan line optimization, which comprises the following steps: S1, establishing a d-q axis control model for a permanent magnet synchronous motor, listing voltage, current and electromagnetic torque equations, giving a harmonic current equation, and adopting an ANF adaptive notch extraction algorithm to obtain a harmonic current control model for the permanent magnet synchronous motor; obtaining estimated values of specific-order harmonic amplitude and phase, and generating harmonic compensation quantity from the estimated values by adopting a PI regulator so as to realize a steady-state indifference-free harmonic suppression effect; and S2, in order to solve the problem that the ANF adaptive harmonic suppression algorithm is difficult to follow the d-q axis current rapidly changing along with the direct current amount, an RANF adaptive harmonic suppression algorithm adopting an R regulator is proposed, the ANF following performance is greatly accelerated, and the practicability of the ANF is improved. When the motor load or the rotating speed changes, quick response can be achieved, system instability is avoided, the dynamic stability of the system is remarkably improved, and the application scene of ANF adaptive harmonic suppression in the permanent magnet synchronous motor is widened.

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.

A SiC three-phase bridge drive circuit module and circuit based on SIP technology relate to the technical field of integrated circuits, and the SiC three-phase bridge drive circuit module comprises a SiC three-phase bridge drive circuit, a metal heat dissipation plate, a metal cover plate, an insulating shell, a lower substrate and an upper substrate. The SiC three-phase bridge driving circuit comprises a power conversion circuit, a four-channel isolation power supply, a six-path SiC MOSFET driving circuit and a SiC MOSFET three-phase full-bridge power module, the SiC MOSFET three-phase full-bridge power module is arranged on the lower substrate, and the power conversion circuit, the four-channel isolation power supply and the six-path SiC MOSFET driving circuit are arranged on the upper substrate. According to the invention, a systematic packaging SIP technology is adopted, an active chip and a passive device are packaged in the same module, a rear stage can directly drive a high-voltage three-phase brushless direct current motor, and miniaturization, modularization and light weight of SiC MOSFET driving are realized.

The invention discloses a motor control switching method and a control circuit thereof, and the method comprises the steps: determining a real-time motor control mode, collecting a system current and a system voltage based on the real-time motor control mode, and calculating the rotating speed of a motor based on the system current and the system voltage; the motor rotating speed is compared with a preset speed threshold value, motor control modes are switched based on a comparison result and a real-time motor control mode, and the motor control modes comprise square wave control and FOC control. Smooth switching of motor control modes is achieved by monitoring the rotating speed of the motor in real time and comparing the rotating speed according to the preset speed threshold value. Square wave control is adopted at a low speed to improve efficiency, and FOC control is switched at a high speed to improve control precision and dynamic response. By collecting system current and system voltage, the rotating speed of the motor is calculated, smooth transition is conducted in the switching process, and it is ensured that the motor stably operates under the large-load working condition within the full-speed range.

The invention discloses a current prediction control method based on a permanent magnet synchronous motor. A control system of the permanent magnet synchronous motor comprises a storage unit in which various parameter tables are preset; the control method comprises the following steps: performing temperature prediction according to current sampling data; dividing a temperature operation interval, judging the temperature operation interval according to the predicted temperature prediction value, and carrying out current amplitude limiting; unifying various temperature limiting amplitudes and voltage limiting amplitudes, establishing constraint conditions of the permanent magnet synchronous motor, and converting equality constraints into a target function through the constraint conditions; eliminating a voltage inequality constraint and a dynamic current inequality constraint in the target function; and finally, calculating to obtain a current reference value at the next moment, and processing the current reference value by the inner loop controller to output a switching signal to the inverter. The control system can adjust constraint conditions and objective functions on line according to actual working conditions such as temperature and motor parameter changes, and robust control over environment disturbance and non-linear influences is achieved.

The invention belongs to the technical field of motor driving and control application, and provides a permanent magnet synchronous motor model-free and dead-beat predictive current control method based on current separation, and the main scheme is as follows: firstly, a permanent magnet synchronous motor current separation model is introduced, and the relationship between different parts in sampling current change is deduced based on the model; then, a model-free dead-beat control integral control law with extremely low parameter dependence is designed; furthermore, only a series of uncomplicated calculations need to be carried out in a control period, and more accurate predicted current and predicted voltage can be calculated without depending on motor parameters. Therefore, no observer is needed, and errors and oscillation possibly brought by the observer are avoided.

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.

A motor current reconstruction method based on inverter-side current sampling using an extended state observer belongs to the field of motor control. For permanent magnet synchronous motor systems with LC filters, it is difficult to directly sample the current input to the motor due to problems such as the current sensor usually being integrated and installed inside the controller and the difficulty in installing the current sensor inside the LC filter. In response to this, the present invention proposes a method for sampling the inverter-side current and reconstructing and feeding back the motor-side current through an extended state observer, which is equivalent to directly sampling the motor-side current. This reconstruction method takes into account both the ease of operation of inverter-side current sampling and the system performance of motor-side current sampling, and does not increase the hardware cost of the control system.

To suppress power consumption by surely detecting phase switching timing of a magnetic signal and reducing a bias current during an unnecessary period without generating switching noise in a motor drive device.SOLUTION: A motor drive device 1 for driving a brushless DC motor comprises a motor drive section 3 which drives a motor 5, a magnetic sensor 6 by which a magnetic field generated by rotation of the motor 5 is detected and outputted as magnetic signals IN1 and IN2, and a bias adjustment section 4 by which a bias voltage to be used for the magnetic field detection of the magnetic sensor is adjusted and outputted. The bias adjustment section 4 adjusts the bias voltage to a second voltage value (VHB / a) lower than a first voltage value of a value at which the magnetic sensor can detect the magnetic field, during a first period after phase switching of the magnetic signals IN1 and IN2 and adjusts the bias voltage to the first voltage value (VHB) during a second period from the lapse of the first period to the next phase switching of the magnetic signals.SELECTED DRAWING: Figure 1

There is provided a control method of a household appliance (100), the household appliance (100) comprising a motor (120) driven by a driving current, the method comprising the steps of: receiving a stop signal for stopping the motor (120); executing an open brake control for stopping the supply of the drive current to the motor (120) on the basis of receiving the stop signal; estimating an initial motor speed of the motor at the start of the open brake control based on a motor phase current of the motor at the start of the open brake control; determining a start time of short-circuit brake control for applying torque in a direction opposite to a rotation direction of the motor based on the estimated initial motor speed; and executing short-circuit brake control at the determined short-circuit brake control start time.

A transport system includes: a plurality of transport path units that apply a driving force to a plurality of moving bodies; a communication master station communicably connected to a transport path communication subordinate station of the transport path unit; a communication subordinate station communicably connected to the communication master station; a position command generator connected to the communication master station; a position generator connected to the communication master station; a position controller connected to the communication subordinate station and allocated to the moving body; and a current command generator to generate a current command value of the transport path unit.

The present application discloses a method, device and storage medium for suppressing harmonic disturbance of permanent magnet synchronous motor current. The method comprises: according to the mathematical model of permanent magnet synchronous motor in d, q coordinate system, establishing current state equation with d, q axis current as state variables; according to the current state equation, modeling d, q axis disturbance of permanent magnet synchronous motor drive system; defining the d, q axis disturbance as new state variables, constructing repeated extended state observer, obtaining observation values ​​of DC disturbance component and high-order harmonic disturbance component of d, q axis; constructing repeated self-disturbance rejection controller according to control instruction value, sampling value of d, q axis current and observation values ​​of DC disturbance and harmonic disturbance obtained from the repeated extended state observer. The present invention has a good suppression effect on high-order harmonic disturbance.

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.