91 results about "Field orientation" patented technology

The invention provides a quick orientating method of a work space measuring and positioning system by a standard rod, which comprises the steps of: calibrating the standard rod; measuring the rotating angle values theta 1 and theta 2 of a rotating table of a transmitting station when two rotating laser planes transmitted out from the transmitting station respectively reach a receiver; obtaining the equation parameter of the rotating light plane equation of the two rotating laser planes transmitted out from the transmitting station under the self coordinate system according to the rotating angle values theta 1 and theta 2 of the rotating table of the transmitting station; and resolving the azimuth angle and the pitch angle of the receiver under the self coordinate system of the transmitting station, so that global orientation is realized, and the like. The method can be used for globally orienting independent of auxiliary equipment, and the positioning and the putting of a work space measuring and positioning system (WMPS) system are not strictly required when the method is used for orientation, so that the use cost of the system can be effectively reduced. One person can complete the field orientation of the WMPS system only within ten minutes by adopting the orientating method provided by the invention, so that the networking measurement efficiency of the WMPS system can be greatly improved, therefore, the quick orientating method is very suitable for industrial fields.

A control system for a rotor motor, which includes a sensorless sensing module, the sensorless sensing module includes a salient polarity-based estimator module that generates a first rotor position signal based on the salient polarity and a second rotor position signal that generates a second rotor position signal based on a counter electromotive force Back electromotive force (emf) estimator module for rotor position signal. For rotor speeds below the first rotor speed, the selector selects the first rotor position signal, and for rotor speeds above the first rotor speed, selects the second rotor position signal. The rotor position sensor detects the position of the rotor and generates a third rotor position signal. The fault detection module detects a fault in the rotor position sensor, outputs a third rotor position signal when no fault is detected, and outputs one of the first and second rotor position signals when a fault is detected. An indirect field oriented control (IFOC) system controls the motor based on a selected one of the first, second and third rotor position signals.

The invention discloses an active disturbance rejection control method of a direct-driven permanent magnet synchronization wind power system. The invention relates to the technical field of wind power, in particular to the active disturbance rejection control method of the direct-driven permanent magnet synchronization wind power system. The direct-driven permanent magnet synchronization wind power system comprises a draught fan, a permanent magnet synchronous generator (PMSG), a machine side converter, a capacitor, a network side converter and a power network. According to the active disturbance rejection control method of the direct-driven permanent magnet synchronization wind power system, a rotor field orientation double-closed-loop vector control strategy is adopted, an outer loop is a speed loop, an inner loop is a current loop, and the machine side converter is controlled to operate. The active disturbance rejection control method can reasonably manage a transient process for a preset rotating speed signal according to the bearing capacity of the direct-driven permanent magnet synchronization wind power system, reduces the overshoot of the rotating speed of the PMSG when the direct-driven permanent magnet synchronization wind power system starts to respond, increases control accuracy and operational stability of the direct-driven permanent magnet synchronization wind power system, has a disturbance feedforward compensation function, and increases capacity, for resisting disturbance, of the direct-driven permanent magnet synchronization wind power system.

The invention relates to a control system and control method for a CMG (Control Moment Gyro) framework permanent magnet synchronous motor, and specifically relates to a control system and control method for precision of the rotating speed and bandwidth of a CMG framework permanent magnet synchronous motor, being suitable for various high performance servo systems, including a CMG framework system, based on a permanent magnet synchronous motor. By means of combination of sliding-mode control with a rotor field orientation vector control method, the control method for a CMG framework permanent magnet synchronous motor can improve the inhibiting ability of the system on the non-linear low frequency interference moment introduced by gyro moment, rotor static unbalance and other factors, and can improve the framework rotating speed control performance and the robustness of the system.

The invention provides a wireless power transmission system and method. The wireless power transmission system includes an emission module, a reception module, a control module and a power supply module, wherein the emission module is used for receiving driving voltage to generate driving current so as to generate an alternating magnetic field, and is coupled with the reception module to perform wireless power transmission; the reception module is used for coupling with the emission module to perform wireless power transmission, and sending the feedback information to the control module; the control module is used for acquiring the amplitude and phase controlling the driving current according to the feedback information, and enabling the power supply module to work according to the acquired amplitude and phase; and the power supply module is used for receiving the amplitude and phase and adjusting the amplitude and phase so as to supply driving voltage for the emission module and generate the required driving current. The invention provides a wireless power transmission system and method, based on a three dimensional coil wave beam shaping technology. The wireless power transmission system and method can control the magnitude and direction of the magnetic induction intensity in the three dimensional space by means of control of the current amplitude flowing into the coil and the phase, enable the magnetic field to direct at the specific position, can continuously feed back information, and can reduce the system stable state error to achieve the aim of field orientation.

The invention discloses an asynchronous motor vector controlling magnetic field orientation correcting method based on torque observation and belongs to the field of asynchronous motor speed regulation. The method relates to a field current loop, a torque current loop, rotor field orientation, stator flux linkage identification, torque observation, space vector modulation, a three-phase full-bridge inverter and an asynchronous motor. Magnetic field orientation correction is achieved by means of the torque observation difference under the dq and alpha beta coordinate systems. Due to the fact that a stator flux linkage is observed directly and observation of a rotor flux linkage is not needed, parameter change on the rotor side does not influence a magnetic field orientation correction system, and parameter robustness is high. An orientation correction model is clear in theory and simple in structure. The method has broad application prospects in asynchronous motor vector control type speed regulation.

The invention relates to a five-phase asynchronous motor control strategy based on stator magnetic field orientation. Considering the characteristics of a five-phase asynchronous motor, the control strategy combines the advantages of vector control and direct torque control. Starting from the torque control effect, on the basis of voltage drop compensation of the stator resistance, the stator fluxlinkage is controlled by the stator straight axis potential. The purpose of controlling the torque is achieved by controlling the current torque component. The continuous control of the torque and the stator flux linkage is realized. The dependence of the system controller on the rotor parameters is avoided. A continuous control method is adopted to overcome torque ripple caused by hysteresis control. The control strategy provided by the invention is suitable for the fields of power electronics and power transmission.

A hair cutting device for facilitating and enhancing the ability to cut hair. The hair cutting device comprises a first elongated guide member that includes a first surface. The first surface includes a gravity field orientation sensor, to sense angular orientation. The first elongated guide member also includes a first end and a second end. The hair cutting device also includes a second elongated guide member that includes a first end configured to selectably couple to the first end of the first elongated guide member. The second elongated guide member further includes a second end configured to pivotly couple to the second end of the first elongated guide member. The second elongated guide member includes a plate member selectably coupleable between the first and second elongated guide members. The gravity field orientation sensor is rotatably coupled to an exterior surface of the first elongated guide member, and rotates 360 degrees.

A hair cutting device for facilitating and enhancing the ability to cut hair. The hair cutting device comprises a first elongated guide member that includes a first surface. The first surface includes a gravity field orientation sensor, to sense angular orientation. The first elongated guide member also includes a first end and a second end. The hair cutting device also includes a second elongated guide member that includes a first end configured to selectably couple to the first end of the first elongated guide member. The second elongated guide member further includes a second end configured to pivotly couple to the second end of the first elongated guide member. The second elongated guide member includes a plate member selectably coupleable between the first and second elongated guide members. The gravity field orientation sensor is rotatably coupled to an exterior surface of the first elongated guide member, and rotates 360 degrees.

The invention provides an induction machine vector control method taking account of iron loss adopts dual closed-loop control of an outer speed loop and an inner current loop, wherein the outer speed loop adopts the rotational speed PI modulating control of a motor and outputs a torque current instruction value of the inner current loop; the inner current loop adopts torque current and field current PI modulating control; in the inner current loop, the torque current and the field current are respectively compensated; and the compensated torque current and field current components are led into the current PI regulation. The induction machine vector control method takes the influence of iron loss on the field orientation and the field intensity into consideration, and improves the field orientation accuracy and control performance of a traditional induction machine vector control method, particularly the speed operating precision in a weak magnetic region and the stability in current control.

The invention relates to the field of a frequency conversion air conditioner, and more specifically relates to an AC-AC frequency conversion air-conditioning control method and a controller. The method comprises: obtaining a compressor target rotation speed, and detecting the three-phase voltage value of three-phase AC power; according to the three-phase voltage value, extracting the phase and the phase sequence of three-phase voltage; and according to the phase and the phase sequence of the three-phase voltage and the compressor target rotation speed, determining a q-axis current target value, the q-axis current target value participating in an FOC field orientation vector control algorithm, wherein the determined q-axis current target value is associated with a three-phase power source so as to adjust the output power of a compressor driver to enable the output power perform same-phase change with three-phase AC voltage. According to the invention, at the time when a power factor is improved, the capacitivity of an energy storage capacitor can be substantially reduced, an active PFC circuit can be avoided, and the transformation efficiency of the controller is improved.

The invention discloses a field orientation-combined tracking photovoltaic array arrangement method which comprises the steps of (1) calculating photovoltaic array arrangement spacing dNS' and dWE' in a north-south direction and an east-west direction after orientation angles gamma of photovoltaic device arrays change; (2) selecting the orientation angles gammai of m photovoltaic arrays, calculating the number Qi of photovoltaic devices which can be correspondingly arranged when the orientation angles of the m photovoltaic arrays are gammai separately and building a relationship model between the orientation angles gammai of the photovoltaic arrays and the arrangement number Qi of the photovoltaic devices; (3) calculating the relationship model between the orientation angles gammai of the photovoltaic arrays and solar radiation Hsingle (gammai) received by a single photovoltaic device all the year round and obtaining a relationship model between the solar radiation Htotal(gammai) received by a photovoltaic power station all the year round and gammai; (4) when the solar radiation Htotal(gammai) received by the photovoltaic power station all the year round is the maximum, taking the orientation angle gammai of the corresponding array as the optimum orientation angle gammaopt of the photovoltaic arrays; and (5) forming an array arrangement scheme of the photovoltaic devices in a photovoltaic field. By the method, array-type optimum arrangement of the photovoltaic devices can be achieved by combining the orientation of the photovoltaic field.

The invention belongs to the field of cotton genetic breeding, and relates to a precocity short-fruit-spur upland cotton new-germplasm breeding method. The method includes the steps that hybridization and backcrossing are carried out with simian 2 as a female parent and gossypium klotzschianum as a male parent to obtain F1 plants and BC1F1 plants capable of normally growing; multi-generation backcrossing is carried out through simian 2 continuously, then backcross descendants are separated through selfing, zero type fruit spur families and first type fruit spur families good in prematurity and yielding ability are selected in separated groups, and precocity cotton new germplasm with the growth period of about 105 days, the zero-type or first-type fruit spurs, the compact plant type, concentrated boll opening, the good boll-setting performance, the high ginning outturn and the good fiber quality is bred through continuous multi-generation selfing and field orientation optimization in cooperation with an indoor plant laboratory test. The precocity source comes from the gossypium klotzschianum, and the hereditary basis of precocity breeding is expanded; precocity genes in the gossypium klotzschianum can be used by breeding and are of great significance in science and production.

The embodiment of the invention provides a synchronous wind power generator closed-loop vector control method and system. The method includes the following steps of: periodically obtaining the actual output power Pout of a wind power generator and the given output power Pout_ref of the wind power generator; and calculating the quadrature-axis current iq_ref of the wind power generator in each period according to the actual output power Pout and the given output power Pout_ref of the wind power generato, and adopting the quadrature-axis current iq_ref as the given value of quadrature-axis current iqs of a d-q coordinate system based on rotor field orientation. With the synchronous wind power generator closed-loop vector control method and system of the technical schemes of the invention adopted, reasonable vector closed-loop control on a wind turbine in operation can be realized, and therefore, the stable output power of the wind power generator can be ensured.

The invention relates to a direct-driven permanent magnetic synchronous wind power generation system. The system includes a fan blade, a PMSG, a machine side converter, a capacitor, a grid side converter and a power grid and is used for absorbing electrical energy emitted from the permanent magnetic synchronous wind power generation system. The invention further relates to a full auto disturbancerejection control method for the direct-driven permanent magnetic synchronous wind power generation system. The double-closed loop vector control strategy of rotor field orientation is utilized by a permanent magnetic synchronous motor, an outer loop is a speed loop, an inner loop is a current loop, and auto disturbance rejection controllers are utilized by both loops to control operation of a machine side converter. Dynamic property of speed control is improved through an auto disturbance rejection speed controller, random disturbance caused by factors such as wind speed are reduced, and influence of nonlinear dynamic change within the system as well as external disturbance is reduced by an auto disturbance rejection current controller. The system is advantaged in that the system can overcome characteristics of uncertainty and multi-interference of a large permanent magnetic synchronous wind power generation system, performs real-time estimation and compensation for internal and external disturbances of a wind fan and improves reliability and anti-interference ability of the overall system.

The invention discloses a vector control AC frequency-variable speed regulation system of an electric automobile, which comprises a DSP controller, a reverse rotation converter module, a two-phase / three-phase AC converter module, a PWM converter, a three-phase AC induction motor, a magnetic flux linkage observer, and a battery pack; wherein, a control system conducts the control by means of speed and magnetic flux linkage closed loop, and a magnetic flux observer uses a current structure; the amplitude and phase of the magnetic flux of a rotor are solved by using three-phase stator current and the rotation speed of the motor, and the field orientation is realized; as the asynchronous motor is a nonlinear link coupled by multiple variables, decoupling and linearization can be achieved via the filed orientation, and therefore system calibration can be performed to obtain the desired dynamic performance. Therefore, by means of comparative and comprehensive researched into the direct torque control technology and vector control technology, the vector control AC frequency-variable speed regulation system has the advantages of solving the key technical problems of the frequency-variable speed regulation of the driving system of an electric automobile, and providing a more efficient technology for the driving system of the electric automobile.

The present invention relates to an arrangement (10) for influencing and / or detecting magnetic particles (100) in a region of action (300), which comprises selection means (210) for generating a magnetic selection field (211) having a pattern in space of its magnetic field strength such that a first sub-zone (301) having a low magnetic field strength and a second sub-zone (302) having a higher magnetic field strength are formed in the region of action (300). The arrangement further comprises drive means (220) for changing the position in space of the two sub-zones (301, 302) in the region of action (300) by means of a magnetic drive field (221) so that the magnetization of the magnetic material changes locally. The arrangement further comprises receiving means (230) for acquiring detection signals, which detection signals depend on the magnetization in the region of action (300), which magnetization is influenced by the change in the position in space of the first and second sub-zone (301, 302). Control means (76) are further introduced for controlling the selection means (210) to individually set the gradient strength of at least one of the static magnetic gradient fields (211) in a desired direction.

A hair cutting device and method for facilitating and enhancing the ability to cut hair. The hair cutting device comprises a first elongated guide member that includes a first surface. The first surface includes a gravity field orientation sensor, to sense angular orientation. The first elongated guide member also includes a first end and a second end. The hair cutting device also includes a second elongated guide member that includes a first end configured to selectably couple to the first end of the first elongated guide member. The second elongated guide member further includes a second end configured to pivotly couple to the second end of the first elongated guide member. The second elongated guide member includes a plate member selectably coupleable between the first and second elongated guide members. The gravity field orientation sensor is rotatably coupled to an exterior surface of the first elongated guide member, and rotates 360 degrees.

A method and system for vector control field orientation correction of asynchronous motor. The method comprises the following steps: obtaining three-phase stator currents ia, ib and ic of an asynchronous motor and an angular velocity omega r of the motor; D-axis current isd and q-axis current isq are obtained by 3s / 2r transformation of current ia, ib and ic, and output voltage amplitude Us is calculated by voltage equation of asynchronous motor; Calculate slip angular velocity increment coefficient Kslip and slip angular velocity omega slip of asynchronous motor; Calculate d-axis control voltage of asynchronous motor shown in the description q-axis control voltage shown in the description and dq axis combined voltage shown in the descrition and according to shown in the description and shown in the description. The SVPWM space vector pulse width modulation (SVPWM-SVPWM) is processed to control the operation of the motor. The invention relates to vector control magnetic field orientation correction of asynchronous motor based on voltage observation, By calculating d, q-axis control voltage shown in the description, Thus, the operation of the motor is controlled, the problem of inaccurate orientation of the magnetic field caused by the difficulty of real-time and accurate acquisition of the rotor parameters of the motor is solved, and at the same time, the d-axis and q-axis voltage observation is taken into account, so that the accurate magnetic field positioning can be realized in the full speed range.

The invention relates to a field-oriented control driving system and control method of a brushless motor. The field-oriented control driving system comprises a master control module, a pre-driver module, a metal-oxide-semiconductor field-effect transistor (MOSFET) bridge module and an analogue magnetic angle measurement sensor module, wherein the analogue magnetic angle measurement sensor module is used for measuring an angular position or a brushless motor rotor in real time and feeding the angular position back to the master control module, the master control module is used for adjusting three paths of complementary pulse width modulation (PWM) waveforms according to angular position information and three-phase current information, and the pre-driver module is used for generating a corresponding waveform to drive the MOSFET bridge module so as to drive running of a three-phase brushless motor. The field-oriented control driving system and control method of the brushless motor employs an analogue magnetic angle measurement sensor and a field-oriented control algorithm, the angle of the brushless motor rotor can be rapidly and accurately measured by the sensor, the position of the motor rotor can be accurately controlled, enough large torque can be output, and the application demand of a robot is satisfied.

The invention provides a power calculation based slip estimation system. The power calculation based slip estimation system comprises a current sampling unit, a current conversion unit, a current regulation unit and a slip calculation unit, wherein the current sampling unit is used for sampling three-phase current of an asynchronous motor, the current conversion unit is used for obtaining feedback current D-axis component and Q-axis component, the current regulation unit is used for obtaining D-axis stator voltage and Q-axis stator voltage, and the slip calculation unit is used for obtaining slip according to the D-axis stator voltage, the Q-axis stator voltage, the feedback current D-axis component, the Q-axis component and a rotor time constant. The invention further provides a corresponding method. The system and the method have the advantages that the slip is estimated according to the ratio of active power to reactive power to enable rotor field orientation error caused by the rotor time constant Tr during speed regulation to become smaller, so that rotor field orientation effect of the asynchronous motor is improved effectively, and torque control precision is improved.

The invention discloses a DFIG back-stepping-control-based stator harmonic wave current suppressing method in a distorted power grid condition. Based on the Lyapunov stability theory, the method performs a back-stepping control algorithm design in a unified mathematical model of DFIG ideal and harmonic wave power grid voltages under a static two-phase coordinate system to achieve active and reactive decoupling control. Defects that conventional vector control dynamic performance is not good enough; complex coordinate transformation is required; strict field orientation projects are difficult to realize; the stable state performance of direct power control through a conventional table lookup method is not good enough are overcome. By means of the method, excellent dynamic and static performance can be achieved in an ideal power grid condition.

The invention relates to a rare earth permanent magnet material technology, and specifically introduces a rare earth permanent magnet with high magnetic performance and high resistivity and a preparation method thereof. 100 parts, 0.1-5 parts of titanate coupling agent, 1-10 parts of bisphenol A epoxy resin, and 0.2-2 parts of bisphenol F epoxy resin are uniformly mixed at 20-200 ℃ temperature field and magnetic field strength: The cured product is formed under the orientation field of 0.5-3T; the preparation process includes coupling the surface of the magnetic powder with the coupling agent, then mixing with the resin, drying and grinding, and forming under the temperature field and the orientation field. Compared with the high-end bonded NdFeB magnet, the magnetic performance of the permanent magnet of the present invention maintains a relatively high level, and the magnetic performance is not significantly decreased, and the magnet resistivity is increased by more than 10 times; there is no obvious temperature rise under a high-frequency alternating field for 1 hour.

The invention discloses a model prediction decomposition control method and device for an open-winding five-phase permanent magnet synchronous motor. The method comprises the steps of obtaining a voltage component under a static coordinate system under rotor magnetic field orientation; synthesizing a virtual voltage vector capable of offsetting the harmonic space voltage according to the vector distribution of the five-phase permanent magnet synchronous motor under the voltage source inverter; enabling the open winding topology of the five-phase permanent magnet synchronous motor to be equivalent to superposition of independent effects of two inverters; predicting a voltage vector which can be generated by one independent inverter through a mathematical model of the motor to obtain an expected increment as a judgment condition, and determining that the open winding system uses one of the two inverters to keep normal operation of the open winding system; or using the first inverter forclamping, and using the second inverter for generating the remaining increment. The device comprises a program unit corresponding to the method step. According to the invention, the switching loss ofthe open winding driving system can be effectively reduced, and the dynamic response of the control system is improved.

The invention discloses a control method of a permanent magnetism direct drive wind generator system under a harmonic wave power grid voltage; the control method relates to the control of a grid sideconverter and a machine side converter of the permanent magnetism direct drive wind generator system; the control object of the grid side converter is set to inhibit the system total output of activeand reactive power 6-frequency multiplication pulsation component; the machine side converter employs a vector control strategy, and sends a permanent magnetism direct drive wind generator system stator average active power order, and a difference between the stator average reactive power and a corresponding feedback quantity to a machine side converter current reference value calculating module,thus obtaining a current reference value; rotor field orientation is employed to send the obtained machine side converter current reference value to a machine side converter current inner ring controllink, thus obtaining a machine side converter control voltage component. The control method can improve the output electric energy quality of the permanent magnetism direct drive wind generator system, thus reducing the DC bus voltage fluctuations, improving the service life, and reducing the operation cost.

The invention relates to an asynchronous motor vector control rotor winding temperature on-line monitoring method comprising the following steps: 1) carrying out rotor magnetic field accurate orientation based on load angle compensation correction according to current and voltage signals under d-q synchronous rotation coordinates; 2) estimating a rotor time constant on the basis of accurate orientation of a rotor magnetic field and correction and compensation of slip frequency; 3) estimating the rotor time constant value in a short time when the motor is started for the first time to reach stable rotating speed, and obtaining a motor cooling medium detection temperature; 4) estimating the current rotor time constant value in the normal working process of the motor, obtaining the motor cooling medium detection temperature corresponding to the moment, and estimating the rotor winding temperature in real time; and 5) obtaining the temperature rise of the rotor winding. Compared with the methods in the prior art, the method has the advantages that the rotor magnetic field orientation is accurate, the robustness is good, the temperature monitoring of the rotor winding is conveniently realized, and the method is not influenced by the characteristics of hardware equipment, the electromagnetic interference of a working environment and the like.

The invention is three-dimensional revolving magnetism field orientation curing systems which are several interlaced electromagnets which can generate electromagnetic filed on a three-dimensional sphere, some electromagnet on the upper hemisphere is on the same beeline which passes through the centre with some electromagnet on the nether hemisphere. The electromagnet can generate magnetism field by the control of computer program, the magnetic force line passes through the centre, thus there is a three-dimensional revolving magnetism field, and the centre of the field superposes with the centre of the sphere. The magnitude of the field and the time can be controlled according to the tumour size. It also can generates the filed on the vertical plane or plane with a angle, all the fields intersect on the centre of the sphere, and makes the center maintain invariable magnetism field, and gathers the paramagnetic nano material onto the centre of the field.

The invention relates to a built-in permanent magnet synchronous motor direct torque control energy saving frequency converter. The built-in permanent magnet synchronous motor direct torque control energy saving frequency converter includes a permanent magnet synchronous motor energy saving frequency-variable controller and a permanent magnet synchronous motor power converter, and can realize highefficiency and quick response control of the built-in permanent magnet synchronous motor, by establishing a built-in permanent magnet synchronous motor equivalent circuit model considering iron coreloss under a rotor field orientation coordinate system, providing a stator linkage calculating method with higher operating efficiency and lower power consumption when the motor output torque and therotating speed are constant, constructing an optimal stator linkage calculating module, putting the optimal stator linkage calculating module into a direct torque control drive system. The built-in permanent magnet synchronous motor direct torque control energy saving frequency converter has the advantages of 1) obviously reducing power consumption of light load operation of the motor, improving the comprehensive performance of the motor drive system in the total speed regulation scope, being simple in structure, being reliable in operation, and being low in cost; and 2) being suitable for a permanent magnet synchronous motor driving application occasion which is often in a light load operation state or in which the load is changed frequently.

The invention provides an induction machine rotor field orientation deviation correction method based on torque estimation. Two methods are respectively adopted in the induction machine rotor field orientation deviation correction method to calculate the output torque of an induction machine. First, voltage and current under a two-phase static coordinate in a vector control system is utilized to calculate output power of the induction machine, and the output torque of the sensing motor is obtained through estimation. Second, by means of current instruction values of a d shaft and a q shaft under a rotating coordinate of the vector control system and a magnetic field orientation deviation angle, the output torque of the sensing motor is obtained through calculation, then an equation of torque composition comprising the magnetic field orientation deviation angle is obtained through calculation of the two methods, the magnetic field orientation deviation angle is solved through the equation, and deviation correction is achieved. The induction machine rotor field orientation deviation correction method based on torque estimation improves accuracy of magnetic field orientation in a traditional sensing motor vector control method, particularly the orientation precision of speed operation of a weak magnetic region.