2221 results about "Electromotive force" patented technology

The invention discloses a computing power load stabilizing and energy-saving management system based on a flywheel energy storage system, and belongs to the technical field of energy storage and management, and the system comprises a data collection module which is used for collecting and calculating a real-time current harmonic spectrum of a cluster and server rack vibration data to generate an electric energy quality characteristic spectrum; the prediction modeling module is used for establishing a prediction model output computing power demand dynamic distribution matrix based on multi-dimensional space-time correlation; the optimization control module is used for analyzing a peak load phase in the power demand dynamic distribution matrix to generate a dynamic coordination control strategy; and the power execution module is used for executing the dynamic coordination control strategy to adjust the phase parameter of the reverse electromotive force of the flywheel so as to offset the voltage harmonic component of the server bus. Harmonic phase compensation is realized through dynamic reverse electromotive force modulation, the calculation load prediction precision can be effectively improved, and the energy utilization efficiency and the equipment operation reliability are remarkably improved.

This application presents an adaptive arc suppression method for ground faults in distribution networks, merging active and passive relay protection strategies. The method proceeds as follows: based on collected ground parameters, the fault phase is identified; compensation current is calculated from the fault's electromotive force, ground leakage resistance, and ground capacitance; current is injected at the neutral point according to the compensation current; finally, the arc suppression scheme is executed based on the zero-sequence voltage of the network's busbars. This approach incorporates both voltage- and current-based methods, addressing the limitation of fixed operation scenarios in traditional arc suppression methods. By quickly adapting to various fault situations, this method ensures an efficient and prompt response tailored to specific scenario requirements.

The present invention provides an inverter control method, device, computer equipment and storage medium, belonging to the field of power electronics. The method comprises: determining a frequency control equation of the inverter under a grid-connected condition when the inverter is in a VSG control mode; determining a relationship between a virtual electromotive force of a virtual synchronous generator in a reactive state and an output voltage of the inverter; constructing a voltage-current double closed-loop control structure of the inverter under the VSG control mode, and determining a current reference value and a voltage reference value of the virtual synchronous generator under dq axes through the frequency control equation and the relationship; constructing a fuzzy control rule of a virtual damping coefficient and a virtual inertia according to the current reference value and the voltage reference value; and controlling the virtual damping coefficient and the virtual inertia through the fuzzy control rule, thereby improving the stability and performance of the inverter during the grid-connected process, reducing the harmonic disturbance of the power system, and helping to improve the adaptability and reliability of the entire photovoltaic power generation system.

A transient electromagnetic scanning detection system and method. An all-terrain vehicle carrying an instrument tows a transmitting coil and a receiving coil having an offset distance of 6-8 meters therebetween, wherein the transmitting coil arbitrarily rotates within an XZ plane, the receiving coil moves in an X direction and a Z direction, and GPSs are carried on the coils. During working, the vehicle stays for a short time every few meters, the transmitting coil performs rotary scanning until 180 degrees, and the receiving coil completes scanning detection of one point; and the process is repeated when the vehicle travels to the next detection point. The inversion is implemented by means of a deep learning model, a large number of resistivity models are randomly generated, and on the basis of an observation system, numerical simulation is performed on an induced electromotive force corresponding to each resistivity model. On the basis of induced electromotive force data and the resistivity models, a deep learning framework-based TEM prediction model is established, wherein the induced electromotive force data is used as an input, and a two-dimensional resistivity structure below the coils is used as an output. The vehicle collects TEM data and imports same into a deep learning network to obtain an underground resistivity structure below the coils in real time to perform transient electromagnetic scanning detection.

The invention is suitable for the technical field of geophysical exploration, and provides a ground-air transient electromagnetic airborne receiving coil motion noise extraction method, which comprises the following steps: designing a receiving device carrying an IMU (Inertial Measurement Unit) sensor, the receiving device comprising a receiving coil, the IMU sensor and a synchronous clock; measuring a vector geomagnetic field in a transient electromagnetic detection area based on attitude angle data of the receiving device; and extracting the motion noise of the airborne transient electromagnetic coil based on the vector geomagnetic field and the attitude angle data. The invention designs a ground-air transient electromagnetic receiving device, and provides a method for extracting motion noise of an airborne receiving coil based on the ground-air transient electromagnetic receiving device, so that the problem that the motion noise is generated due to the fact that the coil cuts a geomagnetic field is effectively solved. Compared with a mode of directly separating the motion noise from the induced electromotive force signal, the method provided by the invention can directly extract the motion noise from the generation mechanism level of the motion noise, and effectively avoids the problem of incomplete noise extraction or target signal loss.

An electric vehicle battery control system including a first electric motor configured to propel a vehicle in a drive mode in response to a drive current, a second electric motor operative to generate a back electromotive force voltage in a fault mode, a battery, having an open circuit battery discharge voltage, for generating the drive current for coupling to the first electric motor, and a vehicle controller for limiting the drive current in response to a difference between the back electromotive force voltage and the open circuit battery discharge voltage being less than a threshold voltage difference.

The invention provides a rotor punching sheet, a permanent magnet synchronous motor and a compressor, a shaft hole, a permanent magnet groove and a permanent magnet are arranged on the rotor punching sheet, and an outer edge line comprises a plurality of arc sections and a plurality of trimming sections; the arc section comprises a first arc and two second arcs, the circle center of the first arc is in the center of the rotor punching sheet, the second arcs are not concentric with the first arc, and the trimming section is tangent to the second arcs; the center line of the permanent magnet in the radial direction is defined as a d axis, and the center line between adjacent permanent magnets is defined as a q axis; the first circular arc, the two second circular arcs and the trimming section under one pole are symmetrically distributed by taking the d axis as a symmetry axis, the mechanical angle occupied by the permanent magnet is 2theta, the radius R1 of the first circular arc is the radius of the rotor, and the radius of the second circular arc is R2; the central angle of the first arc under one pole is alpha; the maximum vertical distance h between the whole circle with R1 as the radius and the trimming section meets the condition that h is larger than 0 and equal to [1-cos (theta-alpha)]. (R1-R2) is smaller than or equal to 2.3 mm. The back electromotive force waveform sine degree is improved by changing h and alpha, the back electromotive force harmonic distortion rate is reduced, and torque pulsation is weakened so as to reduce vibration noise.

The invention discloses a stator winding grounding fault arc extinction method and system based on grounding transition resistance. The method comprises the following steps: S1, acquiring fundamental voltage of a neutral point and a machine end after normal operation and a grounding fault in real time; s2, calculating a fault phase potential EA1, and calculating a phase angle delta between the fault phase potential EA1 and the neutral point ground voltage UN1; s3, constructing a generator stator winding grounding fundamental wave fault analysis positioning equation, and substituting the measurement and calculation amount to complete fundamental wave fault positioning; s4, if multiple solutions occur in fundamental wave fault positioning, introducing a low-frequency injection quantity check criterion, and screening out a unique correct transition resistance value; and S5, carrying out arc extinction on the fault point of the neutral point of the generator in a high-resistance grounding mode. According to the method, the accuracy and reliability of fault positioning are remarkably improved, the possibility of misjudgment is eliminated, and an accurate compensation basis is provided for arc extinction.

The invention discloses an energy-saving gear pump with an intelligent flow adjusting function, and relates to the technical field of gear pumps. Comprising a machine base, a front cover and a rear cover are arranged on the left side and the right side of the machine base respectively, a liquid inlet and a liquid outlet are formed in the front side and the rear side of the machine base respectively, a driving gear and a driven gear meshed with each other are installed in the machine base, and floating side plates are arranged on the front cover and the rear cover; a conical disc is rotatably mounted on the inner side of the liquid inlet; two groups of coils are mounted on the outer side of the liquid outlet; two groups of electrodes are arranged in the liquid outlet; a sieve plate is mounted on one sides of the two groups of electrodes; liquid cuts magnetic induction lines in the magnetic field range of the two sets of coils, induced electromotive force is generated on the two sets of electrodes, the control system processes and calculates the induced electromotive force, then flow data are obtained, and intelligent flow adjustment of the gear pump is achieved.

The invention discloses a hybrid effective flux linkage observer and a permanent magnet synchronous motor control method, device and system. The method comprises the following steps: carrying out Clarke conversion on an obtained three-phase current of the permanent magnet synchronous motor to obtain a current in a static coordinate system, and carrying out park conversion based on rotor position information to obtain a current in a synchronous rotating coordinate system; the effective flux linkage of the permanent magnet synchronous motor is obtained through the hybrid effective flux linkage observer; on the basis of the obtained effective flux linkage of the permanent magnet synchronous motor, dead-zone compensation voltage is obtained through self-adaptive gain dead-zone compensation calculation based on back electromotive force reconstruction, and the rotating speed and the rotor position of the permanent magnet synchronous motor are obtained through phase-locked loop calculation; according to the rotating speed and the rotor position of the permanent magnet synchronous motor, the current under the synchronous rotating coordinate system, the dead zone compensation voltage and the obtained reference rotating speed and reference current, the reference voltage of the motor at the k moment is obtained through a rotating speed loop and a current loop and used for achieving low-speed position-sensorless control over the permanent magnet synchronous motor.

The invention belongs to the technical field of magnetic levitation rulers, and relates to a magnetic levitation ruler horizontal motion control method, which comprises the following steps: establishing a mathematical model of a horizontal system; according to the constructed mathematical model, estimating the position of the rotor iron core through induced electromotive force derivation to obtain the horizontal position and the deflection angle value of the rotor iron core; rotor iron core horizontal motion control based on SYSTD is carried out; and setting the parameters of the horizontal control system of the magnetic suspension ruler system. A mathematical model is established based on a magnetic circuit and a dynamics principle, the problems of nonlinearity and strong coupling of a magnetic levitation ruler horizontal displacement system are solved by applying an improved active-disturbance-rejection control algorithm, and a system structure is simplified by utilizing a position-sensorless control technology. According to the method, unknown dynamic and external disturbance is taken as total disturbance, and real-time estimation and compensation are carried out through an extended state observer; the ADRC not only can adjust errors, but also can actively process uncertain factors of the system and improve the control efficiency, does not depend on an accurate mathematical model, and is high in adaptability and robustness in a complex system.

The invention relates to the technical field of power systems, in particular to a parameter prediction and control method and system of a sensorless motor. The method comprises the following steps: acquiring a sampling stator current and a sampling stator voltage of a motor and a motor rotating speed observation value obtained through an orthogonal phase-locked loop, and performing coordinate transformation on the sampling stator current to obtain a two-phase static coordinate system current; inputting the sampled stator voltage, the two-phase static coordinate system current and the motor rotating speed observation value into a sliding mode observer to obtain a back electromotive force observation value; inputting the back electromotive force observation value into a pre-constructed cross feedback frequency adaptive filter, eliminating harmonic waves and extracting a fundamental component to obtain a filtered fundamental wave back electromotive force observation value; and normalizing the fundamental wave back electromotive force observation value, and inputting the normalized fundamental wave back electromotive force observation value into an orthogonal phase-locked loop to obtain a motor rotor position prediction value and a rotating speed prediction value. By adopting the cross feedback frequency adaptive filter, the quality of the back electromotive force signal is improved, and the accuracy of rotor position and speed estimation is also remarkably improved.

The invention discloses a stator double-permanent-magnet flux reverse motor, and belongs to the technical field of motors. The motor comprises a stator, a rotor, tangential permanent magnets, Halbach array permanent magnets and windings, the stator is of a double-salient-pole structure formed by combining T-shaped stator iron core blocks. The rotor and the stator are coaxially assembled, and an air gap is reserved between the rotor and the stator. The tangential permanent magnets are installed between the stator iron core blocks and magnetized in the tangential direction, and the adjacent directions are opposite. The Halbach permanent magnets are arranged at the openings of the stator slots, so that the Halbach permanent magnets have a magnetism gathering effect and can provide relatively high air gap flux density; the winding adopts a double-layer centralized design and is embedded into a stator slot; the tangential permanent magnets and the Halbach permanent magnets form a parallel magnetic circuit, and the air gap flux density and the torque density are improved through magnetic field superposition; the number of winding pole pairs meets a specific formula, and the motor structure can be optimized through a finite element method. Compared with a traditional motor, the motor has higher air gap flux density, no-load back electromotive force and torque, lower torque pulsation and a higher power factor, and the electromagnetic performance and the operation stability are remarkably improved.

The invention discloses a motor control method and device, a motor, an air compressor, a storage medium and a computer program product, and the method comprises the steps: carrying out the processing of the components of the stator voltage of the motor on the alpha and beta axes and the components of the stator current of the motor on the alpha and beta axes through a preset sliding mode observer module, and carrying out the control of the motor; the components of the counter electromotive force estimated value of the motor on the alpha and beta axes are obtained; based on the components of the back electromotive force estimation value of the motor on the alpha axis and the beta axis, after a preset phase-locked loop module and a preset staged angle compensation module are used for processing, a rotor electrical angular speed estimation value of the motor and a rotor electrical angular position estimation value of the motor are obtained, and control over the motor is achieved. According to the scheme, by combining the sliding mode observer module, the phase-locked loop module and the staged angle compensation module, the rotor electrical angular velocity estimation value and the rotor electrical angular position estimation value of the motor are determined, sensorless control over the motor is achieved, and the control performance of the motor is improved.

The invention discloses a ground fault positioning and multi-solution screening method for a stator winding of a pumped storage unit, and belongs to the field of relay protection. The method is combined with a special structure of a stator winding of a variable-speed pumped storage unit, and a function relationship between a fault winding potential and a fault position is established by taking a slot potential as an analysis unit. In a phasor plane, by drawing a three-phase ground voltage phasor and a neutral point voltage phasor, an included angle relation between a fault point voltage phasor and the neutral point voltage phasor and a phasor triangle relation are utilized to determine an alternative fault point. And then, an optimization model for fault positioning is established, and a homonuclear molecule optimization algorithm is adopted for solving, so that accurate positioning of a plurality of alternative fault points is realized. And finally, third harmonic voltage information is introduced as auxiliary information, and a unique solution is screened out from the plurality of alternative fault points. The method is high in reliability, small in positioning result error and suitable for the positioning requirement of the variable-speed pumped storage unit stator grounding fault.

A bidirectional haptic feedback system, including: a flexible membrane configured to be mounted on a handheld controller; sensor-actuator units arranged on the flexible membrane, the sensor-actuator units respectively including a damping mechanism configured to mechanically isolate vibrations between adjacent sensor-actuator units; a control system configured to: generate vibration signals within selected frequency bands within a proximity to a natural resonant frequency range of the sensor-actuator units to drive the actuators of the sensor-actuator units to deliver haptic feedback to a user based on a state of the robot; simultaneously detect user grasp contact and pressure through analysis of back electromotive force (EMF) signals generated by the sensor-actuator units; and adjust robot control parameters dynamically in response to the detected grasp contact and pressure.

The invention discloses a permanent magnet synchronous motor non-inductive control method, and belongs to the field of permanent magnet synchronous motor control. Comprising the following steps: firstly, selecting stator current in the permanent magnet synchronous motor, defining a system state equation and a mechanical motion equation of the permanent magnet synchronous motor, then designing an exponential sliding mode speed controller, and finally designing a hyperbolic tangent function-based super-spiral sliding mode observer to observe counter electromotive force. And obtaining the rotating speed of the motor by using an arc tangent function. According to the hyperbolic tangent function-based super-spiral sliding mode observer, smooth transition can be provided near a sliding mode surface, high-frequency switching caused by small interference is avoided, system buffeting is obviously reduced, the designed speed controller can quickly respond under the condition that the rotating speed is quickly changed or load disturbance is relatively large, and the system stability is improved. And meanwhile, the problem of integral saturation in a PI speed controller is avoided, the robustness of the system is improved, and the buffeting effect is inhibited.

The invention discloses a liquid metal electromagnetic flowmeter capable of eliminating the influence of an environmental magnetic field and a use method. The flowmeter comprises a flow channel, a magnet exciting coil, a first environment magnetic field eliminating coil, a second environment magnetic field eliminating coil, a first signal receiving coil, a second signal receiving coil and a measuring device. Induced electromotive forces generated by an environment magnetic field on the four induction coils are equal, and the electromotive forces of the elimination coil and the signal receiving coil are superposed and counteracted through a specific connection mode, so that the influence of the environment magnetic field is reduced, and the signal-to-noise ratio is improved. When the flow needs to be measured, firstly measuring the phase difference, then adjusting the frequency to determine the working frequency, obtaining the relationship between the flow velocity and the phase difference, inputting the relational expression, finally measuring the phase difference, performing interpolation calculation to obtain the flow velocity, and calculating the volume and mass flow by combining the geometric parameters of the flow channel and the liquid metal density. The device and the method have the advantages of wide measurement range, high precision, strong applicability and the like, are suitable for various environmental magnetic fields and flow channel sizes, are higher in measurement precision and are stable, and measurement signals are not influenced by corrosion of working media.

The invention relates to the technical field of motor control, and particularly provides a permanent magnet synchronous motor sensorless control method, which comprises the following steps of: designing a front-stage non-smooth extended state observer according to a voltage equation of a permanent magnet synchronous motor, and estimating the back electromotive force of the motor by using the front-stage non-smooth extended state observer; calculating the position error of the motor rotor by using the back electromotive force estimated value; and designing a post-stage non-smooth extended state observer according to the dynamic model of the permanent magnet synchronous motor, taking the position error as an input quantity, and extracting and outputting motor rotor position estimation and electric angular velocity estimation through the post-stage non-smooth extended state observer. According to the invention, the two cascaded non-smooth expansion state observers replace a traditional sliding mode observer and an orthogonal phase-locked loop structure, so that the extraction precision of position and speed information is effectively improved, and the dynamic performance and the steady-state performance of the permanent magnet synchronous motor sensorless sensor are improved.

The invention discloses a manufacturing method of a high-precision intelligent instrument measuring chip and a related device. The method comprises the following steps: firstly, performing multi-stage vacuum annealing and atomic layer reduction corrosion removal on lower-layer copper interconnection, introducing thermal-electric synergistic stress to convert a vacancy-rich layer into < 111 > preferred grains, and obtaining a bonding preparation surface with consistent crystal orientation; and then low-temperature copper-copper thermocompression bonding is completed in a controlled inert atmosphere, and interconnection initial thermoelectric force is intercepted in real time. The method comprises the following steps: establishing a vertical heat flow according to a space mapping power consumption sequence by driving an upper-layer functional region, collecting an interface voltage response, and extracting an interconnection Seebeck deviation through time sequence registration and differential processing; and according to a deviation result, synchronous fusing and parallel connection are implemented by using a programmable metal section of the rewiring layer, a thermoelectric balance interconnection network is constructed, and a zero drift calibration value is written in. According to the scheme, direction-dependent thermoelectromotive force is eliminated in a closed mode on the three levels of material, measurement and interconnection reconstruction, and therefore long-term zero drift stability of a measurement chain is guaranteed under the nanovolt-level noise condition.

Various boost circuits that are used to improve or reduce the time needed to transition an electric machine from an off-state to an on-state at the start of a next pulse during pulsed controlled operation. With these various boost circuits, the naturally generated Back Electromotive Force or “BEMF” that is induced when an electrical machine transitions from the on state to the off state at the end of an on pulse is harvested, rectified, and stored on a storage device. The harvested energy is then made available to the electric machine as a “boost” voltage at the onset of the next on pulse, resulting in a reduced transition time from the off-state to the on-state.

The invention provides a high-adaptability rotary cutter handle self-powered device which comprises a cutter handle, a stator retainer sleeving the lower portion of the cutter handle, a bearing, a rotor core, a winding, a permanent magnet, a stator core, a self-powered circuit board, a circuit board protection cavity, an inner cylinder, an inner cylinder outer ring annular disc and a taper shank straight groove spade drill cutter bar arranged at the lower end of a cutter handle body. Self power supply of the device is realized by adopting an electromagnetic induction principle, the winding on the internal rotor and the permanent magnet of the external stator are designed to cut magnetic induction lines to generate induced electromotive force, and the rotating kinetic energy of the rotating knife handle is converted into electric energy required by the intelligent knife handle, so that power is supplied to the intelligent knife handle. The power supply management circuit is arranged inside, and rectification, filtering voltage stabilization output, overload protection and the like can be carried out on voltage. An external power source and a wire are not needed for power supply and signal transmission of the device, the cutter handle and the cutter are not damaged, and conversion from a common cutter handle to an intelligent cutter handle can be achieved.

The invention relates to the technical field of motor control, in particular to a permanent magnet synchronous motor sensorless control method based on an extended state observer. The sensorless control method for the permanent magnet synchronous motor is characterized by comprising the following steps: establishing a mathematical model of the permanent magnet synchronous motor under a static coordinate system; designing an improved extended state observer based on the mathematical model, and realizing the estimation of the back electromotive force with low phase lag; and processing the obtained low-phase-lag back electromotive force through a phase-locked loop, and extracting position information and rotating speed information of a rotor of the permanent magnet synchronous motor. Phase lag and amplitude attenuation during back electromotive force observation can be effectively compensated, and the estimation precision of the rotor position is improved.

The invention provides a braking method and device of a linear motor, electronic equipment and a storage medium. The method comprises the steps that if the driving voltage of the linear motor after the current moment is smaller than the preset driving voltage, the braking voltage of the linear motor in the second integer number of half cycles is calculated based on the driving voltage before the current moment and the back electromotive force of the linear motor in the first integer number of half cycles after the current moment, the time length of the second integer number of half cycles is the same as that of the first integer number of half cycles; and whether the maximum value of the back electromotive force of the linear motor in the third integer half cycle is larger than or equal to the preset back electromotive force is judged, and whether the linear motor is braked or not is determined based on the judgment result. In this way, efficient and accurate braking of the linear motor can be achieved.

The invention discloses a direct-current brushless motor FOC control method for a high-speed air duct. According to the method, the field oriented control (FOC) technology is adopted, the running state of the motor is monitored in real time through current, voltage and temperature sensors, current decoupling control is carried out in combination with a back electromotive force (BEMF) estimation algorithm, CLARK conversion and PARK conversion algorithms, and efficient and accurate adjustment of the motor is achieved. A current loop and a speed loop are respectively adjusted through a double-PID control algorithm, and stable operation of the motor under the conditions of load change and temperature fluctuation is ensured. A three-phase voltage signal is generated by adopting an SVPWM algorithm to drive the motor, and meanwhile, a dynamic adjustment module and a fault detection module are integrated, so that control parameters can be intelligently optimized, faults such as over-current and over-temperature can be responded in real time, and safe and efficient operation of the motor is guaranteed. Compared with the prior art, the method has the remarkable advantages in response speed, energy efficiency, load stability, fault protection and the like, and is suitable for the fields of high-speed air ducts, electric tools, precision equipment and the like.

The invention discloses a BLDC (brushless direct current) driving parameter self-tuning embedded system and method for multiple equipment types, and the method comprises the steps: constructing a BLDC unified mathematical model containing an electromagnetic torque equation, a back electromotive force equation and a mechanical motion equation, and building a nonlinear mapping relation library of motor type identification codes and a key electrical parameter set; a predefined multi-mode excitation signal sequence is injected into the to-be-driven BLDC motor, dynamic response data are synchronously collected, and the dynamic response data are used for representing the characteristics of the key electrical parameter set; based on collected dynamic response data, equivalent inductance and equivalent resistance in a key electrical parameter set are decoupled and extracted through a frequency domain impedance analysis method, and meanwhile, a counter electromotive force coefficient and rotational inertia in the key electrical parameter set are identified by combining time domain counter electromotive force zero crossing point detection with rotating speed differential operation. Based on a motor fingerprint feature library and a fuzzy adaptive architecture, multi-model debugging-free plug-and-play is realized, and stable control performance is maintained under a dynamic working condition.

Systems and methods are provided for braking a translator of a linear multiphase electromagnetic machine. The system detects a fault event. A polarity indicative of an electromotive force in determined in at least one phase of the linear multiphase electromagnetic machine caused by a motion of the translator. In response to detecting the fault event, the system causes, based on the polarity, a current to be applied to a respective phase of the at least one phase to cause a force acting on the translator that opposes an axial motion of the translator to cause the translator to brake. Braking includes causing the translator to reciprocate at a reduced velocity by opposing axial motion over one or more cycles. The system may use one or more of position information, current information, operating parameters, to brake, or may brake the translator independent of such information.

The invention discloses an on-line monitoring device and method for tiny leakage of a safety valve, in the on-line monitoring device, a variable reluctance type power generation device is placed in a detection pipeline, an electric control device is arranged on the detection pipeline and is connected with the variable reluctance type power generation device through a wire, and a float flowmeter is connected with the detection pipeline through a threaded hole. The float flowmeter is connected with the automatic opening and closing device; when large-flow airflow passes through the detection pipeline, the float flowmeter controls the automatic opening and closing device to be opened through upward movement of a float. After the relief of the safety valve is completed, the electric control device sends an electric signal to the second coil to control the closing of the automatic opening and closing device; at the moment, the gas flow is calculated through the induced electromotive force of the coil; when small-flow airflow passes through the detection pipeline, the gas flow is calculated through the displacement of a floater in the floater flowmeter. On the premise that normal relief of the safety valve is not affected, flow measurement of two working conditions of fault leakage and overpressure relief of the safety valve is completed, and the detection efficiency is high.

The invention belongs to the technical field of vibration energy collection, and discloses a multi-dimensional vibration energy collection device integrated with a damper, which mainly utilizes the Faraday electromagnetic induction principle to realize the function of vibration power generation. When an automobile runs on a normal road, a magnetic ball in the collecting device provides an internal diffusion magnetic field, the magnetic ball irregularly vibrates in an inner cavity of a cup-shaped body, and magnetic flux changes in the moving process; the springs in the dampers surrounding the periphery of the collecting device rotate at a high speed through pawl-ratchet wheel transmission, so that induced electromotive force is generated in damper coils, and the two systems jointly complete conversion from mechanical energy to electric energy. When vibration is large under bumpy road conditions, the damper can fully play a damping role, the mechanical stress of the cup-shaped body in the vibration process is reduced, and the service life of equipment is prolonged. Through ingenious design, originally wasted vibration energy is converted into electric energy, and stable electric power support can be provided for various low-power-consumption devices.

The invention discloses a phase voltage reconstruction method and device of a permanent magnet synchronous motor, a computer program product and a rotor position observation method and device.The phase voltage reconstruction method comprises the steps that three-phase PWM duty ratio signals and direct-current bus voltage of an inverter are collected, and ideal phase voltage is calculated through the duty ratio signals and the direct-current bus voltage; and dynamically correcting the error of the ideal phase voltage based on nonlinear characteristic compensation of IGBT / SiC. And on the basis of voltage reconstruction, a back electromotive force adaptive controller and a permanent magnet synchronous motor rotor position observer of an orthogonal phase-locked loop, full-speed-domain high-precision position estimation is realized by fusing a phase voltage reconstruction algorithm and expanding dynamic tracking capability of an EMF model and a QPLL, performance defects of a traditional method under low-speed and dynamic working conditions are overcome, and high-precision position estimation is realized. And the CPU resource consumption is high.