1551 results about "Space vector" patented technology

To improve a surgical machine with a sensorless electric motor comprising a rotor and at least two motor windings, and with a motor controller for controlling and / or regulating the electric motor, so that the electric motor is operable with optimum efficiency at low rotational speeds and a starting of the motor in accordance with the purpose, also under load, is enabled, it is proposed that a space vector pulse width modulation (SVPWM) method for controlling and / or regulating the electric motor, in which all motor windings are able to be simultaneously supplied with electric current, be performable with the motor controller. A method for controlling and / or regulating a surgical machine is also proposed.

Systems and methods for supplying power (both active and reactive) at a medium voltage from a DCSTATCOM to an IT load without using a transformer are disclosed. The DCSTATCOM includes an energy storage device, a two-stage DC-DC converter, and a multi-level inverter, each of which are electrically coupled to a common negative bus. The DC-DC converter may include two stages in a bidirectional configuration. One stage of the DC-DC converter uses a flying capacitor topology. The voltages across the capacitors of the flying capacitor topology are balanced and switching losses are minimized by fixed duty cycle operation. The DC-DC converter generates a high DC voltage from a low or high voltage energy storage device such as batteries and / or ultra-capacitors. The multi-level, neutral point, diode-clamped inverter converts the high DC voltage into a medium AC voltage using a space vector pulse width modulation (SVPWM) technique.

The invention relates to a current predictive control method of a permanent magnet synchronous motor, which belongs to the electric control field. The dynamic response speed and the control accuracy for the stator current control of the permanent magnet synchronous motor are improved through stator current prediction and deadbeat control, and the system delaying is compensated, so that the noise and the torque ripple of the motor in operation are reduced. The method comprises the steps as follows: obtaining a three phase stator current signal, and the electrical angle and the electrical angular speed of the motor rotor through the technologies of sensor sampling and a photoelectric coded disc or position sensorless detection; carrying out Clarke transformation and Park transformation on the stator current signal to obtain the stator current in a synchronous revolution dq coordinate system; substituting the obtained stator current signal in the dq coordinate system into a control equation of a current predictive controller of the permanent magnet synchronous motor, carrying out deadbeat control according to the given value of the obtained stator current in the dq coordinate system in an outer ring controller to obtain a stator voltage vector in the dq coordinate system; carrying out Park inverse transformation on the obtained stator voltage vector in the dq coordinate system, to obtain a pulse-width modulation (PWM) control signal of an inverter by a space vector pulse width modulation (SVPWM) method, controlling the stator current through the inverter, and then implementing the current predictive control over the permanent magnet synchronous motor.

The invention discloses a coordination control and optimization method for battery energy accumulation and photovoltaic power generation based on a co-direct current bus in synchronization and independent operation modes, which supports the access of various types of storage batteries and photovoltaic battery boards through the free combination of the co-direct current bus of a DC (Direct Current) / DC converter, the automatic intelligent charge-discharge management of a storage battery branch and the maximum power tracing management of a photovoltaic battery board branch, wherein the branches are completely independently controlled to realize optimization management; the energy collected by a direct current bus is interacted with the energy of a power grid or an independent load through a post DC / AC (Alternating Current) converter; the DC / AC converter adopts a method for carrying out directional vector control on the voltage of the power grid and modulating the space vector pulse widthof the voltage in the course of the synchronization operation in an active and reactive complete decoupling control mode; and V / f control is adopted in the course of the independent operation to provide a constant voltage and frequency reference to an alternating current bus. The result of an experiment proves that the invention can realize the coordination complementary control and the autonomous optimization management of photovoltaic power storage and has the advantages of good generality, practicality and application prospects.

The utility model relates to a voltage type source rectifier stable control system and method based on LCL filter wave, belonging to the source rectifying technical range of electronic technology. The system comprises a DC voltage control cell, a current control cell, an active damp control cell and a voltage space vector generating cell. the utility model produces six PWM signals to gain the current signal of the filter wave capacitor branch directly or indirectly, outputs the reference value of the damp voltage and achieves the stable control on the system. The method provides an adjustable sine control on the DC voltage output and input current through the active damp vector control of the voltage type source rectifier stable control system, the damp voltage reference value outputted by the active damp vector control cell, and the network voltage to execute summation operation. The utility model has the advantages of controllable DC voltage, low aberrance rate of the network input current, high power factor, satisfying the requirement of energy double-redirection flowing, and achieving the stability of the system without increasing the quantity of hardware damp resistance.

A voltage source inverter generating a poly phase AC signal is provided that includes an SVPWM controller. The controller is adapted to modify the switching pattern at low sine-wave frequencies creating a more even distribution of the conduction losses. The switching pattern periodically changes the sequence (or rotational sense) of the space vector components from clock-wise to counter-clock-wise direction, and vice-versa.

The present invention relates to a device for realizing beam-forming in CDMA mobile telecommunication system by employing smart antenna technique and method thereof, which forms multiple fixed beams in a sector, and uses multiple fixed beams to form the traffic channel with narrow beams and the common channel with sector beams simultaneously in the same smart antenna system, and overcomes the problem of inconsistency of phrases of respective channels due to the variations of time and temperature without complicated correction technique, thereby improving the capacity and performance of CDMA system with multiple antennas. It solves the problem that the fixed beams in some area correlate with and counteract one another or are greatly reduced due to the correlating addition of the space vectors of each fixed beam when the multiple antenna CDMA system transmits the common channels, and makes the strength of the pilot channel and the traffic channel in corresponding proportion in the coverage area, and improves the signal to noise ratio of receiving signals by the mobile station. By adding an optical transceiver system between the base band and the radio frequency TRX, the base band part can support more sectors. The radio frequency part is very close to the antennas, therefore the power consumption is reduced.

The invention discloses a non uniform rational B spline (NURBS) interpolation based speed smooth control method which comprises obtaining contour parameters of to-be-processed parts and cutting tool processing path according to the obtained contour parameters; utilizing five section S curve method and the space vector transfer method to conduct acceleration and deceleration planning and smooth transfer processing to the processing section of the cutting tool in the processing path, and then conducting interpolation processing to the processing section, so that processing path control signal of the cutting tool can be generated; processing the to-be-processed parts according to the generated processing path control signal of the cutting tool. The NURBS interpolation based speed smooth control method can not only guarantee the instantaneity and processing efficiency of numerical control machining, but also improve transfer speed and processing efficiency between tracks, and prevent mechanical shock on the corner of track section, so that machining precision is improved. Furthermore, only three stages of time of acceleration speed, uniform velocity and deceleration need to be confirmed, and whole section of acceleration and deceleration control curve can be constructed. The NURBS interpolation based speed smooth control method has the advantages of being simple in algorithm, easy to achieve and capable of being widely applied to the field of numerical control machining.

A motor driver has a plurality of output circuits each having an upper side switch and a lower side switch connected in series for supplying a current to a motor. The motor driver includes a current detection resistor connected in series with the plurality of output circuits in common for detecting a current supplied to the plurality of output circuits, a position detection circuit for outputting a position signal corresponding to a position of a rotor of the motor, a current command generation circuit for generating a target current command signal based on the position signal and a predetermined phase angle in which a phase angle of the target current command signal is determined by the predetermined phase angle, and a space vector modulation based logic control circuit for commanding a plurality of output circuits that are set in a plurality of switches states for control of an electric motor.

After an AC motor generates a three-phase current, modulate the three-phase current to generate an original voltage space vector, and add three detecting vectors with a sum of zero after the original voltage space vector. While adding the three detecting vectors, sample the current to generate a sampling result. Then adjust the width of pulses generated by a pulse width modulator according to the sampling result.

The invention discloses a space vector modulation based harmonic current compensation system for a high-speed permanent magnet motor. The system comprises a rotor position and speed observation module, a stator phase current harmonic compensation module, a phase current feedback module, a rotation speed PI adjustment module, a current PI adjustment module and an SVPWM (space vector pulse width modulation) conversion output module. The stator phase current harmonic compensation module comprises a harmonic current extraction module, a proportional controller, a harmonic current adjustment module and a harmonic voltage compensation amount calculation module. The harmonic current extraction module extracts phase current harmonics of a permanent magnet synchronous motor in real time by the aid of an adaptive band-pass filter; the proportional controller adjusts the harmonic current and feeds the harmonic current to a current loop; the harmonic current adjustment module and the harmonic voltage compensation amount calculation module are used for calculating harmonic voltage compensation amount on the basis of a mathematical model of the high-speed permanent magnet motor and feeding back to the voltage loop. By the space vector modulation based harmonic current compensation system for the high-speed permanent magnet motor, voltage compensation amount can be calculated accurately, real-time compensation can be realized, phase current waveforms in operation of the permanent magnet synchronous motor can be improved effectively, torques and rotation speed pulses can be reduced, and accordingly operation efficiency, stability and reliability of the motor can be improved.

The invention relates to a calibration method of a chromaticity LED all-color display screen based on space vector. The method comprises the following steps of: a. collecting images of the LED display screen, testing the brightness and chromaticity of each pixel of the LED display screen and obtaining the data of the chromaticity coordinates and the brightness of the single LED lamp in the pixel on the LED display screen; b. taking image fields of red, green and blue passages formed by the collected initial data as the initial data of vector calibration, importing BMP bitmap into a computer, and differentiating each pixel to obtain a pixel layout chart; c. respectively calibrating the values of the red, the green and the blue passages of each pixel to obtain calibration data of each LED; d. resynthesizing the fundamental colors of pure red, green and blue and representing colors by the three fundamental colors; and e. when the data of the images is obtained by a calibration module in an LED display controller through DVI signal decoding, carrying out calibration and calculation point by point aiming at the calibration values of each specific coordinate point, and obtaining calibrated images at the LED display screen. The method can effectively increase the purity and uniformity of the colors of the LED display screen.

The present invention discloses a motor control method which uses a Space Vector Pulse Width Modulation (SVPWM). Data and instruction data are detected according to the operation state of the motor of the present carrier wave period and the modulation signal of each phase SPWM vector corresponding to the carrier wave period is computed. According to the modulation signal of each SPWM vector, the zero sequence component of the carrier wave period is added and the modulation signal of each phase SVPWM vector in the carrier wave period is obtained. The duty cycle of each phase of the carrier wave period is obtained according to the modulation signal of the SVPWM vector. Based on the duty cycle of the carrier wave period, a PWM control signal corresponding to each phase is generated. According to the PWM control signal, a PWM driving signal of the upper and lower bridge arms of a corresponding inverter is generated to control the turning on or off of each bridge arm of the inverter during the present carrier wave period. The method and device of the present invention have few steps to obtain the SVPWM signal, a simple computation and can use a cheaper chip to control the motor real time.

The invention relates to a variable-frequency power source based on the control of a digital signal processor, which comprises a switch power source module, a control circuit, a circuit for isolating and shaping pulse-width modulating signal, IPM inverting circuits, a circuit for detecting and protecting busbar voltage, a rectification input slow-start circuit, a communication circuit, an interface circuit for isolating and inputting parallel signals and an human-computer interface circuit for displaying the key. The invention adopts the structure of a single digital signal processor (DSP) coupled with the double IPM inverting circuits, provides two paths of independent variable-frequency power sources for two sets of asynchronous motors at the same time and carries out independent speed regulations to the two sets of asynchronous motors. The variable-frequency power source of the invention has the advantages of small volume, low power consumption, high reliability and being convenient for bulk production, etc., and adopts an appropriate switch frequency and an advanced voltage space vector pulse width modulation algorithm (SVPWM), thereby lowering the noise during the operation of the asynchronous motors and increasing the voltage utilization rate, with obvious effect on energy saving.

The invention aims at providing a flux-weakening control system based on a permanent magnet synchronous motor and a control method therefor. The control system comprises a torque input module, a torque-current table look-up module, a vector control and decoupling module, a space vector pulse width modulation and inverter module and the permanent magnet synchronous motor which are sequentially connected with each other; in addition, the permanent magnet synchronous motor also feedbacks current signals into the vector control and decoupling module; the system also includes a flux-weakening control module which is used for receiving straight-axis reference voltage and quadrature-axis reference voltage that are output by the vector control and decoupling module, and outputting straight-axis demagnetized current component into a straight-axis current input circuit of the vector control and decoupling module. The system can effectively avoid the error of a motor controller caused by saturation of an inverter, so as to provide larger surplus capacity for the inverter and lead the inverter to be far away from a saturation area, thus realizing the flux-weakening control for the permanent magnet synchronous motor which is in high speed running, and greatly enlarging the range of speed regulation when the motor runs at high speed.

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.

The invention discloses a nondelay control method for the current of the rotor of the variable speed constant frequency double feed nonsynchronous aerogenerator(DFIG). The switch of the rotational coordinate is finished by collecting three phase rotor current signal so as to obtain the rotor current feedback amount in the static frame of axes to compare with the rotor current command in the stator static frame of axes, the difference signal is input into the proportion-resonance regulator for comparison, the rotor voltage reference value in the stator static fame of axes is obtained after feedback compensation decoupling. The rotor voltage reference value is then transformed into reference signals for space vector pulse width regulation in the rotor frame axes to generate switch signals of the power components of the converter of the rotor to control the synchronize and close operation of the generator. The invention is needless of the break down of the positive and negative sequence of current of the EFIG rotor no matter the electric net voltage is balance or not without introducing break down delay. The invention can realize strengthened control of the generating system in imbalanced electric net, effectively improve non-stop operation of the aerogenerator.

A drive system for a three phase brushless AC motor is arranged to optimize the transistor switching pattern to improve power output whilst allowing current measurement in all of the phases using a single sensor. This is achieved by defining voltage demand vectors x where more than two states are required to meet a minimum state time requirement determined by the single sensor method, and calculating three or more state vectors which produce the demanded vector x whilst still allowing single current sensing. Various methods of optimising the PWM pattern so as to give maximum output whilst using single current sensing are also disclosed.

The invention provides a method and device for measuring position compensation angles of a permanent magnet synchronous motor rotor, wherein the method comprises the following steps: setting a forcible magnetic field directional angle Theta Force; setting component instruction value of a d shaft voltage as u*d=0; inputting the component instruction value u*q of a q shaft voltage which can enable the permanent magnet synchronous motor to enter into a zero speed shaft locking state; according to the forcible magnetic field directional angle Theta Force, obtaining voltage vectors by virtue of PARK inverse transformation of u*d and u*q; generating a power device pulse-width signal needed by a voltage source inverter by a space vector pulse width modulation (SVPWM) algorithm; driving the permanent magnet synchronous motor to rote to a position of ThetaForcee+90 DEG by the voltage source inverter; obtaining the angle Theta xr read by an absolute encoder mounted on the rotor; and calculating the compensation angle that Theta c= Theta Force+ 90 DEG-Theta xr. The method provided by the invention can be simply, conveniently and easily realized; a current sensor is unnecessary to work, and the flitter is not existed during initial location.

In circuit board for a converter, including control electronics, the circuit board includes a device for current detection, the device respectively having at least two measuring amplifier circuits, only the output of one of the measuring amplifier circuits being supplied as the detected current value to the control electronics of the converter.

The invention discloses a control method of an open winding permanent magnet synchronous motor system of a hybrid inverter. The control method comprises the following steps: after acquiring voltage and current of a three-phase stator of a motor, performing three-phase / two-phase static coordinate transformation to obtain voltage and current under a two-phase static coordinate system, thereby obtaining actual feedback values of electromagnetic torque and stator flux linkage; obtaining an initial given value of the electromagnetic torque through a PI (Proportional Integral) controller so as to obtain given values of the electromagnetic torque and the stator flux linkage; then combining output of a capacitor voltage PI controller to obtain final given voltage vectors of two inverters; finally generating a switching signal of the inverters through space vector pulse width modulation; and triggering a switching device of the hybrid inverter to realize direct torque control of the open winding permanent magnet synchronous motor. According to the control method, wide-range operation of low, medium and high speed of the open winding permanent magnet synchronous motor is realized, the electromagnetic torque in a motor acceleration process is increased, the voltage utilization rate of a direct current voltage source is improved, and high-speed constant-power operation of the permanent magnet synchronous motor is guaranteed.

The invention relates to a method for real-time automatic correcting the figure of shield, and relative device, belonging to the shield driven technique. It is characterized in that: using the full-station device in the tunnel to automatically detect the spatial positions of three objects in the shield; using the program based on the spatial vector theory to automatically calculate the shield figure parameters. There are two shield figure automatic correction modes: pressure section control mode and jack group control mode, and it uses special shield figure automatic correction software to control the figure of shield. The invention can avoid the defect that correcting the axes with manual work with big vibration, to improve the operation quality, shorten working period, reduce the labor, decrease working strength and apply on-site management.

The invention discloses a skew offset pipe trajectory planning method based on an arc welding robot system. According to the method, a corresponding skew offset pipe mathematical model is established and an equation of a space welding curve is worked out; in combination with a Frenet-Serret ternary space vector principle in a curve theory, a pose array of all discrete points on a space weld joint path is worked out, and welding postures of a welding gun are planned; and finally, a relation between a skew pipe coordinate system and a robot base coordinate system during actual welding is calibrated through a special teaching mode. By means of the skew offset pipe trajectory planning method based on the arc welding robot system, the positions and postures of the welding gun can be effectively controlled when an arc welding robot welds intersecting pipes. Compared with traditional intersection line trajectory planning, through the trajectory planning method provided by the invention, the fluctuation range of each joint angle can be reduced, occurrence of singular points of joints can be reduced, and accordingly the welding stability is effectively improved.

The invention relates to a single-supply open-coil winding permanent magnet synchronous motor driving system for electric vehicles. Six end leads of a stator winding of a three-phase permanent magnet synchronous motor are respectively connected to two standard two-level inverters. The driving system is supplied power by a direct-current power supply, and generates a rotary circular magnetic field by voltage space vector generated after space vector pulse width modulation. The driving system comprises a direct-current voltage source (1), a first inverter (2), a second inverter (3), a capacitor (4), an open-coil winding permanent magnet synchronous motor (5) and a common-mode voltage suppression vector (6). The first inverter is connected to one end of the winding of the permanent magnet synchronous motor, and the second inverter is connected to the other end of the winding. The drying system has advantages of a three-level inverter and can be applied to the field of driving of high-voltage high-power motors; while quantity of power devices is reduced. Owning to the compact design of the single supply, reliability of the driving system is improved. In addition, the effect of suppressing common-mode voltage can be achieved by effectively selecting the voltage space vectors on the basis of not increasing redundant switch devices.

The invention relates to a method and a device for obtaining synonyms. The method comprises: obtaining a text set, performing word segmentation on the text set to generate a first term set; filtering null words of the first term set through a stop word list, to generate a second term set; performing distance editing processing on any two words in the second term set, to generate a first synonym set; establishing a vector space model on the words in the first term set; according to the model, obtaining space vectors of each pair of synonyms, calculating cosine similarity value of each pair of synonyms, performing cosine threshold filtration strategy identification on each pair of synonyms, to generate a second synonym set; performing part-of-speech tagging on the words in the second synonym set, to generate a third synonym set; and processing the words in the third synonym set by a unary model, to obtain synonyms. Thus, the method and the device realize that retrieved synonyms are more accurate, and ambiguous words and null words do not exist, so as to intelligently retrieve related webpage of synonyms.

The invention discloses a converter modular design and control method matched with battery grouping application. When power modules of a converter carry out grid-connected operations, independent constant power charge / discharge control of each power module can be realized through alternating current side active / reactive power decoupling by adopting grid voltage oriented vector control and voltage space vector pulse width modulation methods. When the converter operates, given N is the number of battery groups connected with the converter in parallel, and when the difference between the power instruction sent by the upper grid dispatcher and the rated power of the converter is greater than 1 / N of the rated power of the converter, the states of charges of the batter groups are taken as the power allocation basis and the operation strategy of timesharing rotation and dynamic dormancy is adopted. The method has the following effects that: the problem of circular current caused by direct parallel use of the batteries can be thoroughly solved; the system loss can be reduced and the efficiency and electric energy quality of the converter device can be improved; and the method has good generality, practicability and an application prospect.

The invention discloses a direct driving wind power generation system based on a double SVPWM current mode convertor and a control method thereof. The system is characterized in that a permanent magnet synchro generator M1 is coaxially connected to a wind turbine M2; a stator alternated current signal output end of the permanent magnet synchro generator M1 is serially connected to a three-phase current fully controlled rectifier, a direct current inductor and a three-phase current synchronization inverter; and the fully controlled power switching tubes forming the three-phase current fully controlled rectifier and the three-phase current fully controlled inverter are fully controlled elements which respectively control with PWM11-PWM16 and PWM21-PWM26 space vector pulse width modulation signals SVPWM. The invention can simultaneously realize the variable speed control of the permanent magnet synchro generator and the synchronization control of the power grid.

The invention discloses a control method of a maximum torque per ampere vector control system for a position sensor-free internal permanent magnet synchronous motor, and belongs to the field of motor control. The problems of complexity of a computing method and low accuracy of an obtained current set value in the conventional maximum torque per ampere control strategy are solved. The control system comprises a permanent magnet synchronous motor, an inverter, a space vector pulse width modulation unit, a three-phase-two-phase coordinate conversion unit, a static-rotational coordinate conversion unit, a Fourier analysis unit, a vector angle regulation unit, a rotating speed regulator, a maximum torque per ampere control unit, a first current regulator, a second current regulator, a rotational-static coordinate conversion unit and a rotor position and rotating speed observer. According to the control method, the magnitude of current amplitude is automatically regulated and compared on the basis of a current vector angle gamma, and an operating point with maximum torque per ampere is automatically searched. The system and the method are applied to maximum torque per ampere vector control over the motor.

A motor driver has a plurality of output circuits each having an upper side switch and a lower side switch connected in series for supplying a current to a motor. The motor driver includes a current detection resistor connected in series with the plurality of output circuits in common for detecting a current supplied to the plurality of output circuits, a position detection circuit for outputting a position signal corresponding to a position of a rotor of the motor, a current command generation circuit for generating a target current command signal based on the position signal and a predetermined phase angle in which a phase angle of the target current command signal is determined by the predetermined phase angle, and a space vector modulation based logic control circuit for commanding a plurality of output circuits that are set in a plurality of switches states for control of an electric motor.

A method and apparatus to provide estimates of electrical parameters for line-connected induction motors during either steady-state or dynamic motor operations. The electrical parameters are calculated from the motor nameplate data and voltage and current measurements. No speed sensors or electronic injection circuits are needed. The method can be divided into 4 major steps. First, complex space vectors are synthesized from voltage and current measurements. Second, the instantaneous rotor speed is detected by calculating the rotational speed of a single rotor slot harmonic component with respect to the rotational speed of the fundamental frequency component. Third, the positive sequence fundamental frequency components are extracted from complex space vectors. Finally, least-squares estimates of the electrical parameters are determined from a dynamic induction motor equivalent circuit model.