674 results about "Vector control" patented technology

Methods, system and apparatus are provided for sensorless control of a vector controlled motor drive system that includes an electric motor used to drive an auxiliary oil pump.

The invention discloses a singlechip-based induction motor variable frequency speed regulation control system. The system comprises a main circuit, an auxiliary power circuit, an inverter circuit, a control part, an over-current protection circuit, a rotation speed detection circuit and other peripheral circuits. A 16-bit high-performance signal controller dsPIC30F4011 which is produced by the Microchip Company is used as a control core by the system to perform speed regulation based on vector control motor excitation. A digital signal controller dsPIC30F4011 of the America Microchip Technology Company is used as a chip special for motor control, a digital signal processor (DSP) inner core is embedded, and the chip has quick data processing capacity and is provided with abundant input and output equipment and interface circuits; an intelligent power module (IPM) IRAMSIOUP 60A of the IR Company is an inverter switching device, so that the variable frequency speed regulation control system of an asynchronous motor is constructed; and the system has the characteristics that the system is simple to drive and easy to realize.

A power controller for applying power to an induction motor or similar AC load has a variable drive circuit for staring and switching a portion of the AC input line power. In one mode, the input line power is fed straight through to the load. In another mode, the AC waveform is reshaped to improve the power factor or to boost its RMS value, e.g., for brownout protection. In a further mode the output power can be provided at a different frequency from the input line power. Vector control increases efficiency through power optimization, with sensing of load requirements. Sensing of regeneration pulses at the commencement of a half cycle can be employed for direct sensing of motor speed or load.

The invention discloses a scheme for controlling the grade parking of a permanent magnet motor-driven pure electric vehicle. The pure electric vehicle has an electrical system comprising a battery pack, a motor, a power converter, a motor controller and a vehicle controller and further comprising corresponding voltage, current and tilt sensors. The scheme comprises two steps of: (1) detection for the initial position of a rotor of a permanent magnet synchronous motor: a detection voltage is applied to the permanent magnet synchronous motor by the power converter, and the initial spatial position of the motor rotor in the case that the vehicle is stationary is calculated through a current feedback signal; and (2) torque self-balancing strategy based on vector control: the torque self-balancing characteristic can enable driving torque to track load torque automatically. The torque required by parking is calculated in accordance with the tilt angle of a ramp on which the vehicle is to be parked, and then, reasonable current amplitude and phase are given according to the initial position of the rotor and the torque required by grade parking in order to enable the driving torque to be equal to the load torque, therefore, stationary parking of the vehicle on the grade is realized.

Methods, system and apparatus are provided for overmodulation of a five-phase machine in a vector controlled motor drive system that includes a five-phase PWM controlled inverter module that drives the five-phase machine. Techniques for overmodulating a reference voltage vector are provided to optimize voltage command signals that control a five-phase inverter module to increase output voltages generated by the five-phase inverter module.

The invention relates to a motor controller of electric automobile and control method thereof. According to technical requirement of permanent magnet motor for electric automobile, structure and method of the control system is determined, micro-controller of Infineon Technologies is adopted as the control chip considering cost and efficiency, motor control functions such as vector control, space vector pulse width modulation (SVPWM), A / D conversion (A / D) and failure diagnosis are completed. A whole vehicle controller requests signals including motor operation mode signal, torque instruction signal from the motor controller through a whole vehicle high-speed CAN (control area network). After analyzing and processing by the micro-controller, the control power device outputs corresponding current, thus the motor outputs corresponding steering and torque, and responds the current operation state to the whole vehicle controller, so that a motor control process is completed.

Embodiments of the present invention relate to methods, systems and apparatus for controlling operation of a multi-phase machine in a vector controlled motor drive system when the multi-phase machine operates in an overmodulation region. The disclosed embodiments provide a mechanism for adjusting a duty cycle of PWM waveforms so that the correct phase voltage command signals are applied at the angle transitions. This can reduce variations / errors in the phase voltage command signals applied to the multi-phase machine so that phase current may be properly regulated thus reducing current / torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source.

The invention discloses a sensorless vector control device for a non-salient pole type permanent magnet synchronous motor. The sensorless vector control device comprises a sensorless closed-loop control module based on position self-adjusting voltage vector switching and the like. The permanent magnet synchronous motor is connected with a CLARK conversion nodule. The CLARK conversion nodule is respectively connected with the sensorless closed-loop control module based on position self-adjusting voltage vector switching and an IPARK conversion module. The IPARK conversion module is respectively connected with a first subtracter, a second subtracter and a third subtracter. The first subtracter and the second subtracter are connected with a speed ring integral separation PI module. A current ring integral separation PI module is connected with the sensorless closed-loop control module based on position self-adjusting voltage vector switching. The sensorless closed-loop control module based on position self-adjusting voltage vector switching is respectively connected with a phase-locked loop rotating speed estimation module and a PARK conversion module, and the PARK conversion module is connected with the sensorless closed-loop control module based on position self-adjusting voltage vector switching and a space vector modulation module. The space vector modulation module is connected with a rectification / three-phase inverter, and the rectification / three-phase inverter is connected with the permanent magnet synchronous motor.

Methods, systems and apparatus are provided for controlling operation of and regulating current provided to a five-phase machine when one or more phases has experienced a fault or has failed. In one implementation, the disclosed embodiments can be used to synchronously regulate current in a vector controlled motor drive system that includes a five-phase AC machine, a five-phase inverter module coupled to the five-phase AC machine, and a synchronous current regulator.

The invention discloses a dynamic control method of a linear steering engine electric loading system, comprising the following steps: modeling a servo loading motor, constructing a torque balance equation, and constructing a linear steering engine mechanism model; building a ball screw pair motion model; analyzing the transfer function of the electric loading system, designing a three-closed-loop control method based on a current inner loop, a position outer loop and a force outer loop, and applying complex vector PI control in the current inner loop to enable the current of the servo loading motor to track instruction signals quickly and accurately; and finally, making feed-forward compensation for angular velocity, and verifying the control method. The method takes an electric loading system driven by a permanent magnet synchronous motor as a specific object, and considers the impact of the characteristics of the linear steering engine and the coupling degree between the linear steering engine and the electric loading system. The active force of active displacement of the linear steering engine is inhibited, and the loading precision of the linear loading system is improved. Moreover, a verification method is put forward, which makes a linear load simulator better evaluated.

The invention discloses a polyphase permanent magnet synchronous motor current waveform optimal control method, comprising the following steps of A, current reference value coordinate transformation; B, current multiple proportion resonance regulation; and C, coupling compensation. In the control method, based on polyphase permanent magnet synchronous motor vector control, a polyphase synchronous rotating coordinate system current reference value is transformed to a current reference value of each phase in a polyphase static coordinate system through polyphase coordinate transformation, the current reference value of each phase and a current feedback value of each phase of a motor are respectively subjected to improved multiple superposition proportion resonance regulation, and a resonance separation method is introduced, decoupling is realized by feed-forward compensation, and floating tracking and harmful subharmonic restraining for highly dynamic property fundamental waves and usable subharmonic are realized. The method can restrain the adverse impacts, such as motor loss, torque ripple and vibration noise, caused by a harmful harmonic current of the polyphase motor, can explore the positive effects of the usable harmonic current, gives full play to the advantages of the polyphase motor and improves the system performance.

The invention discloses a PMSM (Permanent Magnet Synchronous Motor) control method and system. The PMSM control method and system are characterized in that a sliding mode observer for a load torque is designed in a PMSM vector control; compensation is performed by means of integration with slide mode control of a speed ring; redesign is performed on a speed controller; and at the same time, a relatively stable q-axis reference current can be obtained so that relatively ideal rotating speed and torque can be obtained. The PMSM control method and system can quickly and effectively adjust various input and output parameters of the PMSM when the system is interfered, and has the advantages of being high in the dynamic response speed and the robustness, and improving the control accuracy and operational reliability of the PMSM.

The invention relates to a method and device for observing and controlling a rotor position in motor control. According to the method and the device, an initial position angle of a motor rotor can be observed; angular errors caused by an imprecise assembled angle of a Hall sensor can be eliminated by online discrimination of software; a real-time speed detection program is provided to eliminate an angular accumulated error caused by imprecision of an angular speed omega; a rotor position angle can be precisely tracked in a motor vector control operation process, the rotor angle is prevented form overflowing, and self-detection of the motor in reverse rotation can be realized; and when a certain sensor has a fault, a system can judge a fault point per se and performs self-adaption to achieve the function of still normally running. According to the device and the method, independence on a hardware circuit is reduced, observation and real-time tracking of the rotor position angle can be realized, the function of fault judgment of the system can be used for protecting the motor, and loss caused by motor locking or running out is prevented. The device has a great practical value in the fields of electric vehicles and precise machine tools, and has the advantages of reliability in operation, low cost and wide application range.

It is the objective of the present invention to provide a sensorless vector control method and a control apparatus, for an alternating-current motor, that can smoothly restart an alternating-current motor in the free running state. According to the present invention, when a current that flows in an alternating-current motor (2) at a restart time 7 the alternating-current motor (2) continuously flows at a designated current level or higher for a designated period of time, it is determined that the rotational direction or the velocity of the alternating-current motor (2) is incorrectly estimated, and a direct current or a direct-current voltage is again applied to again estimate the rotational direction and the velocity.

The invention discloses a full-vector control method of a five-phase fault-tolerant permanent magnet motor. According to the method, a five-phase SVPWM method is adopted when the motor operates normally; after a one-phase open-circuit fault occurs on the motor, the traditional SVPWM method and a current hysteresis control method are combined together to re-construct a post-fault coordinate system; re-distribution and sector reconstruction of space vectors are performed on the reconstructed coordinate system; target vectors are synthetized through re-selection of the space vectors; and therefore, full-vector control on the five-phase fault-tolerant permanent magnet motor can be realized. With the full-vector control method adopted, problems such as hardware variation and loop width selection brought about by the switching of normal five-phase SVPWM to current hysteresis control existing on most current methods can be solved, and tracking performance can be ensured, and torque ripples after open-circuit faults can be effectively restrained.

A controller for vector-controlled motor of vehicle judges whether a battery needs to be warmed up in accordance with an output of a battery temperature sensor, and when the battery needs to be warmed up, in situation (i) where the vehicle is stopped, sets a q-axis current value of the motor at zero, or when a brake is released from the situation (i), sets a q-axis current at a value corresponding to a drive torque for a vehicle creep operation, and sets a d-axis current at a value for battery warm-up. When the battery needs to be warmed up in situation (ii) where the vehicle is running, the controller sets a q-axis current at a value corresponding to a drive torque of vehicle running and sets a d-axis current at a value for the battery warm-up in relation to the q-axis current value.

The invention reveals a permanent magnet synchronous motor control system with a load state observer. The control system is based on the vector control, is combined with speed-and-current double closed-loop control, and is added with the load state observer wherein the load state observer includes a load torque observer and a moment-of-inertia identification module. The observed value of the load torque is used for the feedforward compensation of current control so as to raise the response speed and robustness of the controller. The moment-of-inertia identification result is used to adjust the ratio of the system's speed ring and the integral gain, so as to obtain the optimized speed loop response performance, and realize the self-tuning of the controller parameters.

A motor control device performing vector control for a motor that drives a load whose load torque varies periodically. The motor control device has: a motor speed deriving portion estimating or detecting a motor speed; a speed controller producing a specified torque current value such that the motor speed is made to follow a specified motor speed value fed from outside; a resonance filter producing a corrected torque current value by receiving a control value that varies with variations in the load torque and emphasizing a periodic variation component of the control value; a torque current corrector producing a specified superimposed torque current value by superimposing the corrected torque current value on the specified torque current value; and an adjusting portion adjusting, based on the specified superimposed torque current value, the phase of the corrected torque value by controlling the resonance filter. The vector control is performed according to the specified superimposed torque current value.

The invention discloses a paratactic structure hybrid excitation synchronous machine (HESM) and an alternating current excitation control system thereof, belonging to the technical field of synchronous machine alternating current generation. The permanent magnet part and the electromagnetic part of the HESM are arranged in the same closure in parallel along the axial direction, the stator cores of the permanent part and the electromagnetic part are mutually independent, jointly share one stator armature winding and have the same number of tooth sockets, permanent magnet induced electromotive force and electromagnetic induced electromotive force are superposed in the armature winding, and the purpose of improving the induced electromotive force waveform can be achieved by designing the armature winding distribution mode, the excitation winding distribution mode and the permanent magnet rotor pole shape as well as controlling the exciting current. The magnitude and phase of the electromagnetic induced electromotive force in the armature winding can be adjusted by vector control to enable the alternating current exciting current to only have a direct axis component, thus adjusting the magnitude of the total output voltage of a machine, stabilizing the output voltage of the machine, and realizing constant voltage output in a wide revolving speed range and a large load range.

A steering actuator (1) designed as a linear electro-mechanical actuator for a ship control system which comprises an electric motor (2), a controller (11) connected, via a CAN bus, to the electronic control unit of the ship control system (ECU) and an angle sensor (12) actively connected to the controller (11) for determining the angular position of the rudder (13). The electric motor (2) is designed as a vector-controlled brushless motor.

The invention discloses a method for controlling a pan-tilt motor. The pan-tilt is a multi-axis pan-tilt, and the multi-axis is at least two axes. The rigid body member is carried, the carrier platform of the platform is provided with a first inertial measurement unit (IMU), and at least one rigid body member used to carry the shaft motor is provided with a second IMU, the method Including: obtaining the first measurement attitude information obtained by the first IMU measurement, and the second measurement attitude information obtained by the second IMU measurement; according to the first measurement attitude information and the second measurement attitude information, calculating the The rotation angles corresponding to the respective rotating shaft motors on the multi-axis pan / tilt; based on the corresponding rotating angles of the respective rotating shaft motors, closed-loop vector control is performed on the corresponding rotating shaft motors. The invention also discloses a control device of the pan-tilt motor and the pan-tilt.

The invention discloses a variable PI flux-weakening control method for a permanent magnet synchronous motor. The flux-weakening control method comprises the following steps of calculating an output voltage amplitude value according to a vector-controlled output voltage vector of the permanent magnet synchronous motor, and setting a voltage amplitude-limiting threshold value for the voltage amplitude value through a controller; performing closed-loop regulation according to the output voltage amplitude value and the voltage amplitude-limiting threshold value to obtain primary flux-weakening current; and performing amplitude limiting on the primary flux-weakening current to obtain the flux-weakening current. The invention also discloses a driving control apparatus for realizing the variable PI flux-weakening control method for the permanent magnet synchronous motor; the driving control apparatus comprises a driving circuit and a control module; the control module generates a driving signal to control the driving circuit; the driving circuit generates a three-phase voltage; and the three-phase voltage is used for controlling the permanent magnet synchronous motor. The variable PI flux-weakening control method and the driving control apparatus provided by the invention have the advantages of high response speed in entering the flux-weakening state and low response speed in quitting from the flux-weakening state, and the like.

The invention discloses a fault-tolerant-vector-control-based third harmonic current injection method of a five-phase permanent-magnet motor. The method comprises: a fundamental wave decoupling model under various open-circuit faults of a five-phase permanent-magnet motor is established and a corresponding fundamental fault-tolerant current is deduced; according to a magnetic resonance method, a torque mathematical model under the fundamental fault-tolerant current is established; on the basis of the established torque model, an expression of third harmonic current injection under various open-circuit faults is deduced; on the basis of a superposition principle, the fundamental current is added to the third harmonic current to obtain a total fault-tolerant current; and with corresponding deflation clark and park transform, a current component under a rotation orthogonal coordinate system is obtained, so that third harmonic current injection under magnetic field orientation control and fault-tolerant vector control under faults is realized. Therefore, on-line calculation of the third harmonic current under fault-tolerant vector control and injection of the third harmonic current at a fixed switching frequency are realized; the torque ripple is suppressed and the system robustness is enhanced; and the switching loss and the electromagnetic interference are reduced.

Methods, system and apparatus are provided for controlling third harmonic voltages when operating a multi-phase machine in an overmodulation region. The multi-phase machine can be, for example, a five-phase machine in a vector controlled motor drive system that includes a five-phase PWM controlled inverter module that drives the five-phase machine. Techniques for overmodulating a reference voltage vector are provided. For example, when the reference voltage vector is determined to be within the overmodulation region, an angle of the reference voltage vector can be modified to generate a reference voltage overmodulation control angle, and a magnitude of the reference voltage vector can be modified, based on the reference voltage overmodulation control angle, to generate a modified magnitude of the reference voltage vector. By modifying the reference voltage vector, voltage command signals that control a five-phase inverter module can be optimized to increase output voltages generated by the five-phase inverter module.

The invention relates to an AC-DC-AC auxiliary converter of a motor train unit and a working process of the AC-DC-AC auxiliary converter. The auxiliary converter comprises a controller, a pre-charge circuit, a boosting transformer, an input filter circuit, a rectifier circuit, a discharge circuit, an inverter module, an output filter module and an output contactor, wherein the pre-charge circuit, the boosting transformer, the input filter circuit, the rectifier circuit, the discharge circuit, the inverter module, the output filter module and the output contactor are connected with the controller; when the auxiliary converter is started, the pre-charge circuit is charged; when charging voltage reaches a certain level, the pre-charge circuit is disconnected and the auxiliary converter works without resistance; when the auxiliary converter works normally, the auxiliary converter inputs three-phase AC and boosts the three-phase AC through the boosting transformer TR1; when input voltage is over a zero point, a PWM rectifier is started, output voltage reaches stable DC voltage through a unipolar four-quadrant double closed-loop control algorithm of the PWM rectifier; rated three-phase AC voltage is output through a voltage space vector SVPWM control mode of the inverter; and a load is provided with electricity through the output filter circuit and the output contactor. By the auxiliary converter and the working process thereof, the power supply reliability of the auxiliary converter can be improved.

A lead-angle control device according to the present invention includes: a space voltage vector controller calculating effective vector application times necessary for obtaining output voltage vectors of an inverter from stationary-coordinate-system instruction voltage components; a lead-angle compensator comparing the sum of the effective vector application times with a sampling period, and generating lead-angle compensation values; a speed controller generating an instruction current for compensating an error caused by a difference between an instruction speed and a current speed; an instruction current generator which generates a rotating-coordinate-system instruction current component by extracting a lead-angle component at a point where maximum torque-per-ampere can be obtained from the magnitude of the instruction current and performing a mathematical calculation on the magnitude of the instruction current and a lead-angle component; and an instruction voltage generator generating a stationary-coordinate-system instruction voltage component from the rotating-coordinate-system instruction current component.

A controller for vector-controlled motor of vehicle judges whether a battery needs to be warmed up in accordance with an output of a battery temperature sensor, and when the battery needs to be warmed up, in situation (i) where the vehicle is stopped, sets a q-axis current value of the motor at zero, or when a brake is released from the situation (i), sets a q-axis current at a value corresponding to a drive torque for a vehicle creep operation, and sets a d-axis current at a value for battery warm-up. When the battery needs to be warmed up in situation (ii) where the vehicle is running, the controller sets a q-axis current at a value corresponding to a drive torque of vehicle running and sets a d-axis current at a value for the battery warm-up in relation to the q-axis current value.

The invention discloses a starting method of a senseless permanent magnet synchronous motor, comprising the following steps: S10), after short-circuiting a motor winding, detecting a motor induced current by driving a sampling module of a controller; S20), determining whether the motor induced current is less than a predetermined value of induced current, if so, proceeding to step S30), or if not,proceeding to step S40); S30), performing open-loop start control; S40), determining whether the motor is in a forward or reverse rotation state, if in the forward rotation state, proceeding to stepS50), if not, proceeding to step S60); S50), performing forward rotation closed-loop vector start control; and S60), performing reverse rotation closed-loop vector start control. The starting method ensures the fast and low-current high-efficiency start when the permanent magnet synchronous motor is stationary or tends to be stationary, realizes fast closed-loop vector control under strong downwind or upwind conditions, reduces energy consumption, shortens start time, and makes motor start smooth.

The invention discloses a vector control device for an induction motor and relates to a vector control device without speed sensor for the induction motor. The invention solves the problem of the vector control method of the conventional induction motor that a system is unstable in a low-speed power generation state and has a bigger rotating speed observation error under a low-speed condition because a rotating speed adaptive rate cannot guarantee the stability of an algorithm. In the invention, the speed of the motor can be observed by adding the exciting current error between the actual value and observed value of an exciting current and the product of a q axis stator magnetic chain observed value and a variable gain (M) into the general product of the observed current bias and the observed rotor magnetic chain and through a PI regulator; and thus, the speed of the motor can be controlled. The device reduces the low-speed performance of the system considerably and solves the unstable problem of the system in a power regeneration state effectively. The device is used for controlling the rotating speed of the induction motor.