162results about How to "Improve dynamic and static performance" patented technology

The invention discloses a speed sensorless vector control method on the basis of a cascaded high voltage inverter, which is characterized by comprising the following steps of: 1, establishing a rotor flux linkage voltage model; 2, establishing a rotor flux linkage current model; 3, identifying a rotating speed, using the rotor flux linkage current model in a two-phase rotating coordinate system in the step 2 as an adjustable model, using the rotor flux linkage voltage model in the step 1 as a reference model, utilizing a model reference adaptive system, and adopting a Popov hyperstability theory to obtain a rotating speed identifying model; 4, obtaining a three-phase sinusoidal voltage reference signal by speed and current double close loop control; and 5, sending the three-phase sinusoidal voltage reference signal to a phase-shifting SPWM (Sinusoidal Pulse Width Modulation) distributing plate, controlling a cascaded power unit by utilizing a phase-shifting SPWM control method and controlling the rotating speed of a motor. Due to the adoption of the method disclosed by the invention, a speed sensor does not need to be arranged on a motor shaft, the defects caused by the installation of a speed encoder are avoided, and the flux linkage and the rotating speed of the motor can be well estimated.

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 novel fuzzy active disturbance rejection controller based five-phase fault-tolerant permanent magnet motor speed control method, and designs the novel fuzzy active disturbance rejection controller. A rotating speed differential value generated by a tracking differentiator and a system disturbance value observed by a linear expansion state observer are taken as the input of a fuzzy logic theory machine; and the output bandwidth value omega<c> of the fuzzy logic theory machine is taken as bandwidth input of a proportional controller. The fuzzy controller can change parameters of the controller according to the working conditions of the system in real time; the design difficulty of the controller is lowered, and the controller parameters can be adjusted in real time according to the running working conditions of the system; the novel tracking differentiator of the novel fuzzy active disturbance rejection controller ensures that the motor has no overshoot rapid response in the whole dynamic process; and compared with a conventional linear active disturbance rejection controller, the novel fuzzy active disturbance rejection controller designed in the invention has strong disturbance resisting capacity and adaptive capacity for complex working conditions, and the excellent dynamic performance.

The method discloses a bearingless synchronous reluctance motor torque and suspension force direct controller and a construction method thereof. The bearingless synchronous reluctance motor torque and suspension force direct controller consists of a direct torque controller with a rotating speed and torque double closed loop and a suspension force direct controller with a rotor displacement and suspension force double closed loop, wherein the direct torque controller consists of two proportional plus integral (PI) controllers, a torque winding flux linkage and a torque observer, a reference flux linkage generating module and a space vector pulse width modulation module; and the suspension force direct controller consists of two proportional plus integral plus derivative (PID) controllers, a torque winding flux linkage and torque observer, a suspension force winding flux linkage observer, a suspension force estimation module, a force/ flux linkage conversion module and a space vector pulse width modulation module. By the controller and the construction method, motor torque and radial suspension force are independently controlled, stable suspension and operation of a motor rotor are ensured and high motor operating performance is achieved.

The invention relates to a controller and a controlling method of a no-bearing permanent-magnetic synchronous motor. The controlling method comprises the following steps: a direct torque controller calculates magnetic linkage and a torque by torque winding magnetic linkage, a double-closing loop of a rotating speed and the torque is constructed, the increment of the phase angle of the magnetic linkage is generated by the comparing difference value of the instruction value and the real-time value of the rotating speed and the torque through double-P1 modulation, and a switch signal of an inverter of a power supply source is obtained by the modulation of SVM and a reference magnetic linkage generating module; a suspending power direct controller calculates the magnetic linkage by a winding magnetic linkage observer of the suspending power, the double-closing ring of rotor shift and the suspending power is constructed, the comparing difference value of the rotor shift generates a suspending power instruction value by PID modulation, and the switch signal of an inverter of a power supply is obtained by the rotor shift comparing difference value and the comparing difference value of the real-time value thereof after the modulation of SVM and a power/magnetic linkage converting module. The direct torque controller and the suspending power direct controller are used for forming the torque and suspending power direct controller to control the no-bearing permanent magnetic synchronous motor, and the controlling method has the advantages of simplicity and good effect.

The invention relates to a multi-phase induction motor-specific subharmonic current suppression method, which includes the following steps: (A) current reference value processing; (B) current feedback value processing; (C) current regulation; (D) voltage reference value determination. Based on the vector control of a multi-phase induction motor, the method maps the current of the multi-phase motor into a corresponding synchronous rotating reference frame of a fundamental wave and each subharmonic orthogonal to each other by multiple synchronous rotating coordinate transformations, and uses proportional-integral controllers to respectively carry out tracking with zero steady-state error and combine to form an integral current controller. The method has the advantages that trapezoidal integration is adopted to increase integral accuracy, and supplemented by variable structure control, appropriate self-adaptive compensation is introduced to resist control saturation, so that static and dynamic performance is further enhanced; the method can suppress motor loss caused by the harmful subharmonic current of the multi-phase motor and the adverse affection of torque ripple, vibration noise and the like, and can utilize the positive effect of usable subharmonic; the method takes full advantage of the multi-phase motor, and enhances system performance.

The invention discloses a Hall type rotary-motion valve position transmitter. The technical scheme includes that a Hall type displacement sensor is fixed to a rotary shaft of a pneumatic actuating mechanism or a valve stem of a valve, and is used for converting displacement of the valve stem into an electric signal and transmitting the position signal to a main circuit during movement of the valve stem of the valve; and the main circuit is used for receiving the position signal transmitted by the Hall type displacement sensor and sampling and processing information processing of the position signal, so that position data of the valve position of the valve are measured. According to the technical scheme, on the one hand, shortcomings of high mechanical abrasion, lagging, easiness in being affected by external vibration, sort service life of a structure, and the like of a displacement sensor of an existing rotary-motion valve position transmitter can be overcome, on the other hand, dynamic and static properties of a valve positioning device of the rotary-motion valve position transmitter can be improved, and high-precision feedback transmission of the data of the valve position can be realized.

The invention discloses an integrated control method of an energy feedback frequency converter and relates to a control method of the energy feedback frequency converter. The method comprises the steps of control of a rectification circuit and control of an inversion circuit. According to control of the rectification circuit, direct current side generatrix voltage and grid side line current are detected, grid side voltage and virtual flux linkage are calculated, a power estimator estimates active power and reactive power according to the current and the virtual flux linkage, the active power and the reactive power are converted by a proportional-integral (PI) regulator and coordinates, and a switching signal of an insulated gate bipolar transistor (IGBT) of the rectification circuit is generated by using a space vector modulation technology. According to control of the inversion circuit, the direct current side generatrix voltage and motor stator current are detected, motor stator flux linkage and electromagnetic torque are calculated and converted by the PI regulator and the coordinates, and the switching signal of the IGBT of the inversion circuit is generated by using the space vector modulation technology, so a system works in an expected mode, and control over a motor is realized. The integrated control method of the energy feedback frequency converter has the advantages that the system is high in dynamic performance and static performance, and the performance of the frequency converter is greatly improved.

The invention discloses a permanent magnet synchronous motor sensorless control method with pulse high-frequency injection, and belongs to the motor control field. The high-frequency signal generatorgenerates a high-frequency voltage signal and injects the high-frequency voltage signal into an estimated d-axis coordinate system. The stator winding currents ia, ib and ic are sampled by the currentsensor and transformed into a coordinate system rotating synchronously with the estimated position to obtain d-q-axis currents id and iq; According to the obtained iq, the position error informationis extracted by using the moving average filter, and the rotor position estimation value is calculated. Based on the obtained id, the magnitude of the current is calculated using the moving average filter, and the polarity of the rotor magnetic pole is determined. This method can realize the position identification at zero speed and low speed. The bandpass filter and low pass filter are omitted inthe signal processing process, and the stability and dynamic and static performance of the system are improved. The sliding average filter is easy to realize digitally and only needs to complete thewindow length design, thus simplifying the signal processing process.

The invention provides a single-phase AC-DC conversion circuit of directional power. The single-phase AC-DC conversion circuit of the directional power comprises a power circuit, an auxiliary circuit and a control module. The power circuit is used for completing power conversion of a single-phase AC-DC. The auxiliary circuit is used for completing instantaneous detection of the input voltage, the input current and the output voltage, completing driving of an original PWM pulse, and outputting various detection values to the control module. After the control module receives the various detection values of the auxiliary circuit, the control module conducts digit arithmetic and logic processing on the basis of the principles of direct power control and double-loop control, finally, an original driving pulse is obtained, the original driving pulse is output to the power circuit after driving, on-off rules of a power device is controlled so as to enable the power circuit to complete correction of power factors, and the stable direct-current voltage is output. The single-phase AC-DC conversion circuit of the directional power achieves the single-phase AC-DC conversion of the network side unit power factors, and the single-phase AC-DC conversion circuit of the directional power has the advantages of being high in response speed, strong in anti-jamming capability and suitable for changes of loads within the wider range, and has load following features.

The invention relates to a polyphase induction motor appointed secondary current waveform control method, comprising the following steps of A, current feedback value processing; B, current complex regulation; and C, voltage reference value determination. In the method, based on polyphase induction motor vector control, a polyphase motor current is mapped to a synchronous rotating coordinate system of mutually orthogonal fundamental waves and each usable subharmonic through polyphase synchronous rotating coordinate transformation, proportion integration resonance regulation and proportion integration regulation are respectively executed, and a complete current controller is formed by superposition; integration and resonance separation are respectively introduced so as to further improve the static and dynamic performances. The method has the advantages that the method is realized by digital control, and is simple and practical; 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 induction motor, can explore the positive effects of the usable harmonic, and gives full play to the advantages of the polyphase motor. The method can be used in the high-power alternating current motor driving occasions, such as marine propulsion, mining machinery and track hauling.

The invention discloses a prediction control method for a modularized multi-level inverter. According to the control method, prediction control is adopted on the basis of a traditional capacitance and voltage sequencing principle of various submodules, wherein the prediction control has the advantages of high tracking speed, small harmonics, fixed switching frequency and the like. According to a traditional modulation method, a sampling current needs to be transformed into a dq coordinate system and generates a modulation wave through a PI (proportional-integral) link, the modulation wave is compared with a triangular wave to form an SPWM (Sinusoidal Pulse Width Modulation) wave, and a large amount of calculations are needed in the transformation process. The prediction control method disclosed by the invention has the advantages of relatively small calculated amount, high tracking speed, small harmonics, fixed switching frequency and the like.

The invention discloses a single-winding bearingless motor torque and suspension force direct controller and a construction method. The controller comprises a reference value calculation part and an observation value calculation part, wherein the observation value calculation part comprises a winding flux observer, a suspension force observer, a torque observer and two matrix transform modules; output of the first matrix transform module is connected with input of the winding flux observer; the output of the winding flux observer is connected with the suspension force observer and the torque observer respectively; the output of the second matrix transform module is connected with the winding flux observer and the torque observer respectively; a observed winding real-time flux is applied to the torque observer, the suspension force observer and a torque and suspension force voltage reference value generator; a voltage static coordinate instruction value is generated in the torque and suspension force voltage reference value generator according to a flux amplitude instruction value, real-time winding torque component flux amplitude and phase and an actual feedback current; and the torque and rotor radial suspension force are directly controlled.

A micro-actuator of the invention includes a support frame having a base, a moving plate, a leading beam to connect the base with the moving plate; and two slider holding arms extending from both sides of the moving plate; at least one piezoelectric elements bonding to the support frame to connect a free end of the base with the moving plate; wherein the moving plate sways in a first direction or in a second direction when the at least one piezoelectric elements being actuated. The invention also discloses a head gimbal assembly and a disk drive unit using the micro-actuator.

The invention discloses a speed sensor-free high-voltage synchronous motor vector control method. The method is characterized by comprising the following steps of timely sampling stator voltage and stator current; obtaining the position and speed of a rotor through a phase-lock loop; obtaining three-phase sine voltage signals through speed and current double closed-loop control; and sending the three-phase sine voltage signals to a phase shifting SPWM distribution plate, controlling a cascaded power unit using a phase shifting SPWM control method, and controlling a motor rotation speed. With the method provided by the invention, no speed sensor is required on a motor shaft, and defects caused by installation of a speed encoder are prevented.

The invention discloses a kind of pure water electromagnetic ball valve. It includes electromagnet, mechanism of force amplification, ball valve core in the hole of valve body, rest spring, valve cap and push bar. On the upper of valve body there is water inlet, water outlet and back water gap connected by channel; through leaving and covering of ceramic ball and valve seat, forming open and closed circuit to change the direction of fluid flow. The ceramic ball is generated by driving force of the dry-type DC electromagnet and spring force of the reset spring, and transmitted by the push bar. The proper layout of flow channel balance hydraulic pressure of the push bar and the ceramic ball. The invention achieves zero leakage by sealing directly valve plug and valve cover, valve cover and valve body, the core of ceramic ball and valve seat; improves static performance of the electromagnetic ball valve by add valve port dampers; switch fast by electromagnets with larger thrust and mechanism of force amplification. This valve is versatile and fit to work under conditions of middle and high pressure water medium.

The invention discloses a Hall type intelligent valve positioner which comprises a feedback connecting rod structure, an angular travel Hall sensor, a main control circuit, an electric appliance conversion and pneumatic amplifier, a feedback output circuit and an accessory circuit. The feedback connecting rod structure is connected with a valve rod and the angular travel Hall sensor, the angular travel Hall sensor converts angular displacement into electric signals which are transmitted to a main control circuit, sampling, comparing and data processing of front end input signals and valve position feedback signals are completed in the main control circuit, according to differential between differences, intelligent PID operation is carried out, the main control circuit outputs corresponding control quantity which drives a pneumatic actuator through electricity-gas conversion and a pneumatic amplifier, and real-time control over the valve position is achieved. Through the feedback output circuit, current valve position data are output to an upper computer. According to the Hall type intelligent valve positioner, the angular travel Hall sensor can achieve linear measuring on angular displacement, and the control quality of the intelligent valve positioner is improved.

The invention discloses a nonlinear inverse decoupling controller for a bearingless synchronous reluctance motor and a construction method thereof, and is suitable for high-performance decoupling control of the bearingless synchronous reluctance motor. Two Park inverters, two Clark inverters and two current hysteresis PWM inverters form two expanded current hysteresis PWM inverters together; the two expanded current hysteresis PWM inverters and a controlled bearingless synchronous reluctance motor are taken as a whole to form a compound controlled object; an alpha-order inverse system is connected in series before the compound controlled object so as to compound a pseudo linear system consisting of a speed subsystem and two position subsystems; a linear close-loop controller is designed for the pseudo linear system according to a linear system design method; and finally the linear close-loop controller, the alpha-order inverse system, and the expanded current hysteresis PWM inverters together form the nonlinear inverse decoupling controller for nonlinear dynamic decoupling control of the bearingless synchronous reluctance motor.

A suspension for a HGA includes a flexure having a tongue region and an out trigger. The out trigger has a pair of rigid beams and a pair of spring beams. The pair of spring beams enables the flexure to possess favorable flexibility and assists a slider to have enough displacement. The pair of rigid beams provides the flexure enough stiffness which not only successfully prevents the HGA with the out trigger from suspension deformation and dimple separation, but also assists to improve shock performance of the HGA. Furthermore, such configuration of the suspension provides the slider a good static performance and thus improves dynamic performance of the HGA. The present invention also discloses a HGA with the suspension, a manufacturing method of the HGA, and a drive unit with such HGA.

The invention relates to a model reference self-adaptive system parameter self-tuning method based on one-dimensional fuzzy control. The method comprises the following steps that (1) a model reference self-adaptive system based on the one-dimensional fuzzy control is structured according to an actual physical model of a permanent magnet synchronous motor; (2) direct-axis currents and quadrature-axis currents are calculated respectively according to the actual model and a reference model, and a current error variable e(t) of the direct-axis currents and the quadrature-axis currents is obtained according to an error calculation formula; (3) the changing range of e(t) is defined as current error variable pulsation band e(t)band, and the e(t)band is sent into a one-dimensional fuzzy controller after action of the input scale factor Ke of the one-dimensional fuzzy controller; (4) fuzzy controlled quantity output u(t) is obtained according to one-dimensional fuzzy rules; (5) u(t) is acted by the output scale factor Ku of the one-dimensional fuzzy controller and amplified to the actual controlled quantity on PI parameters; (6) u(t) is converted into a precise output value u0(t) and is overlapped on the PI parameters. The model reference self-adaptive system parameter self-tuning method based on the one-dimensional fuzzy control can be widely applied to the field of control over motors without position sensors.