551 results about "Tachometer" patented technology

The invention provides a rotating speed control method for a brush motor, and relates to the technical field of data processing, and the method comprises the steps: collecting the voltage, current and rotating speed of the brush motor, calculating the change rates of the voltage, current and rotating speed at adjacent moments, constructing a corresponding change rate sequence, dividing the change rate sequence into a plurality of window intervals, and in each window interval, determining the rotating speed of the brush motor; calculating a delay amount group, judging whether the brush motor has response abrupt change or not, recording corresponding response abnormal moments, extracting rate evolution data corresponding to the response abnormal moments, calculating a weighted average rotating speed change rate, and obtaining a predicted rotating speed offset sequence; and according to a difference value between the predicted rotating speed offset sequence and the real-time rotating speed, calculating a compensation voltage increment, generating a compensation voltage signal, and ensuring that the rotating speed of the motor is stable. The rotating speed of the brush motor can be predicted, and the stability of the rotating speed is ensured through voltage correction.

The invention relates to the technical field of industrial automation control, and particularly discloses a rotating speed detection and closed-loop control system based on photoelectric sensing and a PLC, and the system comprises at least one rotating body which is a rotating speed controlled object, and the surface of the rotating body is provided with a configurable number of reflection mark areas or speed measurement holes; the proximity photoelectric switches are in one-to-one correspondence with the rotating bodies, are aligned with the reflection mark areas or the speed measurement holes, and are used for detecting rotation information of the rotating bodies and generating original pulse signals; a high-speed counter input port of the PLC is electrically connected with signal output ends of the proximity photoelectric switches, and a pulse preprocessing module, a rotating speed calculation module, a deviation processing module, a control algorithm module and a signal adaptation module are arranged in the PLC. The PLC and the proximity photoelectric switch which are widely applied in the industrial field and high in popularity rate are adopted as core technical components, and expensive special servo controllers, encoders and other devices are not needed, so that the hardware purchase cost of the system is greatly reduced.

The invention provides a dynamic hand feedback adjusting method and device, a storage medium and an electronic device.The method comprises the steps that the steering wheel input angle, the wheel response angle and the actual steering wheel rotating speed of a steer-by-wire vehicle are dynamically detected; calculating an angle difference between the steering wheel input angle and the wheel response angle; calculating dynamic feedback torque according to the angle difference and the actual rotating speed of the steering wheel; and applying a reverse force to a steering wheel of the steer-by-wire vehicle based on the dynamic feedback torque. Through the embodiment of the invention, the technical problem that the vehicle is unstable due to the angle difference between the actual turning angle of the steering wheel and the actual turning angle of the wheels in the prior art is solved, the dynamic perception of a driver to the vehicle is enhanced, and the driving safety, the control experience and the stability of the vehicle are improved.

The invention relates to the field of aero-engine testing, in particular to an aero-engine rotating speed signal generator and a control method, and the system comprises the steps that a main control module receives a test demand input by a user, selects and determines the model, matching frequency, voltage and phase parameters of a tachometer sensor needing to be simulated based on the test demand, and transmits the parameters to a DSP processor; the DSP processor receives parameters issued by the main control module and generates an SPWM signal through a timer; the timer is configured to be in a circulation mode, and the period of the PWM signal is changed by changing the initial value of the timer; the inversion module converts the isolated SPWM waveform into a three-phase alternating current signal and outputs the three-phase alternating current signal; and the detection module measures data of the three-phase alternating current signal output by the inversion module in real time and feeds back the data to the main control module to form closed-loop control. Test errors caused by performance errors of the sensor are avoided, and the actual performance of the tachometer indicator can be evaluated more accurately.

The invention relates to the technical field of tire detection, in particular to a method for identifying abnormal vibration of a tire through color difference of an automobile tire tread, which comprises the following steps: generating a point cloud picture; generating a first tire surface height point cloud picture at the first rotating speed; generating a first visual point cloud picture and determining an abnormal vibration level; dividing detection intervals, wherein n detection point sets are configured in each detection interval; generating a second tire surface height point cloud picture at a second rotating speed; reducing the rotating speed of the tire at a preset rate, calculating a stability score, and judging whether the stability of the detection device meets requirements or not; and in response to the satisfaction, rendering the tire surface to generate a second visual point cloud picture, and determining an abnormal vibration level. According to the method, the height difference of the tire surface height at each detection point position is calculated, and the tire surface is rendered according to the height difference and the preset color matching mechanism, so that the vibration condition caused by the tire surface height can be intuitively and visually displayed.

The invention discloses a material taking flow control method for semi-closed spiral material taking equipment, relates to the technical field of material conveying, and is used for controlling the semi-closed spiral material taking equipment. The target conveying amount of the horizontal material collecting mechanism and the target rotating speed of rotating blades of the horizontal material collecting mechanism are set, and the target filling rate of the horizontal material collecting mechanism is calculated based on the target conveying amount and the target rotating speed; according to the flowability of the target material, initial state adjustment of the semi-closed spiral material taking equipment is completed, and a theoretical current value of a driving motor of a horizontal material collecting mechanism in the initial state is obtained through calculation; and dynamically adjusting the rotating speed of the rotating blade of the horizontal material collecting mechanism based on current value comparison. The semi-closed spiral material taking device can be intelligently controlled, and stable material taking operation is achieved.

In a hydraulic drive system used for an electrically driven hydraulic work machine that drives a hydraulic pump by an electric motor and supplies a hydraulic fluid to plural actuators to carry out work, the power consumption of the hydraulic pump is kept from exceeding a value decided in advance. For this purpose, a controller calculates target power to be consumed by the hydraulic pump on the basis of the capacity of the hydraulic pump, the delivery pressure of the hydraulic pump sensed by a pressure sensor, and a target revolution speed of the electric motor, and limits the target revolution speed of the electric motor in such a manner that the target power falls within a range of the maximum allowable power.

The invention provides a vehicle drifting control method, device and equipment, a computer readable storage medium and a computer program product. The method comprises the steps that based on target state information and actual state information of a vehicle, a first slip rate component and a second slip rate component are obtained, the first slip rate component is used for slip angle stability control, and the second slip rate component is used for yaw velocity control; determining a left rear wheel slip rate target and a right rear wheel slip rate target based on a basic slip rate target, the first slip rate component and the second slip rate component; and rotating speed calculation is conducted based on the actual state information, the left rear wheel slip rate target and the right rear wheel slip rate target, and the vehicle is controlled based on the obtained left rear wheel rotating speed target and the obtained right rear wheel rotating speed target. According to the invention, a driver can maintain stable drifting of the vehicle only by operating the steering wheel and the accelerator.

The invention discloses a deep-sea robot driving motor current-sharing heat balance method, which comprises the following steps of S1, constructing a differential equation set for describing input and output characteristics of a motor, and covering mechanical and electrical parts; s2, measuring the current and the rotating speed of each armature in real time, and calculating a current difference value; s3, constructing a parameter matrix and a solution matrix for calculating a control gain, and establishing a weight matrix and an adjustment coefficient for dynamically calculating a control signal; s4, updating the control weight matrix in real time according to the current difference value, iteratively updating the solution matrix, calculating a control voltage signal and applying the control voltage signal to each armature; the current-sharing heat balance method is based on the current signals of the armatures of the motor, the deviation signals are calculated, the control voltage is dynamically adjusted, it is ensured that the rotating speed of the motor accurately tracks the target signals, it is also ensured that currents of the armatures tend to be the same, heat balance between the armatures is achieved, and stable operation of the motor is ensured.

The invention provides an active damping control method and an active damping control system.The active damping control method and the active damping control system are used for restraining rotating speed shaking of a transmission system output shaft, and the active damping control method comprises the following steps that vehicle driving information is collected and comprises the actual rotating speed of a motor; calculating a theoretical rotating speed of an output shaft according to the vehicle driving information; calculating the theoretical rotating speed of the motor according to the theoretical rotating speed of the output shaft; and calculating motor compensation torque according to the actual rotating speed of the motor and the theoretical rotating speed of the motor.

The invention belongs to the technical field of mixing equipment, and particularly relates to a non-intrusive homogenizer operation process abnormity monitoring method and system, and the method comprises the steps: calculating the mechanical angular acceleration according to the real-time rotating speed of a motor shaft end; on the basis of a pre-constructed inverse dynamic model, according to the motor orthogonal axis current, the motor shaft end real-time rotating speed and the mechanical angular acceleration, a rheological resistance characteristic index is calculated; processing the rheological resistance characteristic index by using a singular spectrum analysis algorithm, and extracting a trend line of the rheological resistance characteristic index through construction of a trajectory matrix, singular value decomposition and diagonal averaging operation; the information entropy of the first-order difference sequence of the trend line is calculated to serve as the mixing stability entropy, and the mixing end point of the operation process of the homogenizer is judged according to the convergence condition of the mixing stability entropy relative to the reference entropy, so that anomaly monitoring of the operation process of the non-intrusive homogenizer is achieved. According to the invention, abnormity monitoring and end point determination of the mixing process of the homogenizer are realized.

The invention discloses a parallel hybrid power ship transient control system which comprises a propeller and a gear box, the gear box is composed of a clutch a, a clutch b and a gear, the clutch a is sequentially connected with an engine and a CAN bus, and the clutch b is sequentially connected with a torque sensor, a shaft tachometer, a reversible motor, an AC / DC device, a storage battery pack and the CAN bus. The system further comprises a cRIO controller with an acquisition card and an upper computer, wherein the cRIO controller is connected with the CAN bus. The invention further discloses a control method. The optimal reversible motor torque and clutch combination pressure are switched in the switching process of different working modes, so that engine speed fluctuation in the switching process of a ship can be reduced, and the working condition of a transmission system can be improved.

The invention discloses a coal-fired power plant belt conveyor driving gear box bearing fault diagnosis method, which relates to the field of fault diagnosis and evaluation, and is used for extracting gear box bearing fault features based on an order tracking analysis method of tachometer-free instantaneous rotation frequency estimation. The method specifically comprises the following steps: S1, obtaining an instantaneous rotation frequency ridge line through the time frequency distribution of a vibration signal, carrying out the rotation frequency estimation of a rotating shaft, and improving the precision of the instantaneous rotation frequency ridge line through an improved multi-source ridge line fusion algorithm; and S2, extracting bearing fault feature order information by using a calculation order tracking COT algorithm, and adaptively processing a bearing fault diagnosis problem of the driving gearbox of the belt conveyor. According to the bearing fault diagnosis method for the rubber belt conveyor driving gearbox of the coal-fired power plant, the bearing inner ring fault is successfully diagnosed, and the feasibility of a bearing fault diagnosis strategy for the rubber belt conveyor driving gearbox is verified.

The invention discloses a torque control device and method for a power transmission tower bolt fastening wrench, and belongs to the technical field of bolt fixation. The torque control device comprises a single-chip microcomputer, and a key, a display screen, a Bluetooth module, a GPS positioning module, a wireless communication module, a height detection module, a Hall rotating speed sensor and a current sampling module which are connected with the single-chip microcomputer; wherein the Hall rotating speed sensor is arranged around a driving motor of the bolt fastening wrench, collects a position signal and inputs the position signal into the single-chip microcomputer for rotating speed calculation; the current sampling module is connected with a three-phase full-bridge circuit of the driving motor, current sampling data is input into the single-chip microcomputer after A / D conversion, and control over an outer ring of the driving motor is achieved through the PID controller. The single-chip microcomputer is connected with the three-phase full-bridge circuit for PWM adjustment and steering control of the driving motor, model prediction control of an inner ring is achieved, and torque control of the bolt fastening wrench is achieved by combining control over the outer ring and the inner ring of the wrench driving motor. The output torque of the wrench can be accurately controlled.

The invention provides a gearbox gear control method and device based on dynamic planning. According to the method, the torque and rotating speed requirements of an output shaft of a gearbox are calculated by obtaining front road data and whole vehicle real-time parameters, and the target torque and rotating speed are obtained; the gear shifting cost at the gear shifting moment is calculated, the gear shifting cost comprises oil consumption and impact cost, the gear shifting cost is optimized through a dynamic programming algorithm, and a target gear shifting path and gear time sequence data at multiple moments in the future are determined; and according to the target gear shifting path and the activation state of the gear selection mode, a recommended gear is determined, and a gearbox is controlled to optimize a gear shifting strategy. The reasonable gears are planned in advance, and the problems that in the prior art, planning cannot be conducted in advance according to road changes, consequently, power losses are caused, and the energy consumption of the whole vehicle is high due to the fact that the economical efficiency and gear shifting impact of the whole vehicle are not considered sufficiently are solved.

The invention belongs to the technical field of motor control, and particularly relates to a motor three-phase counter electromotive force phase sequence detection circuit and a running direction judgment device. The phase sequence detection circuit comprises a comparison circuit and further comprises a tachogenerator coaxially connected with the motor to be detected, and the output end of the tachogenerator is electrically connected with the input end of the comparison circuit so that the phase sequence of the three-phase counter electromotive force of the motor to be detected can be obtained through the three-phase voltage output by the tachogenerator through the comparison circuit. The three-phase counter electromotive force of the to-be-tested motor is directly detected through the tachogenerator coaxially connected with the to-be-tested motor. The rotor of the tachogenerator rotates along with the rotation of the motor to be tested, and the rotor of the tachogenerator cuts magnetic lines in the operation process, thereby generating the three-phase counter electromotive force of the motor to be tested. The technical problem that in the prior art, when ground voltage detection is not accurate due to external interference, detected counter electromotive force is not accurate, and then the motor control effect is affected is solved.

The embodiment of the invention provides an oil quantity calibration method and device, a storage medium, a controller, a system and a vehicle, and the method comprises the steps: obtaining a first preset parameter set, the first preset parameter set comprises a first preset parameter pair corresponding to a first motor stator under a plurality of single motor working conditions, and the first preset parameter pair comprises torque and rotating speed; calculating a first required oil quantity based on the torque and the rotating speed of each first preset parameter pair; the first required oil quantity of each first preset parameter pair is used as a basic value, and a first target oil quantity of the first motor stator meeting the first temperature condition under the corresponding working condition is calibrated; calibrating a second target oil quantity when a second temperature condition is met under a working condition corresponding to a second motor stator load; the actual oil mass is adjusted to be consistent with the sum of the first target oil mass and the second target oil mass under the corresponding single-motor working condition, and the current total oil mass is calibrated as the target total oil mass; and the target total oil quantities under the multiple dual-motor working conditions are gathered, and an oil quantity control calibration table is formed.

The embodiment of the invention discloses a vehicle speed regulation control method which comprises the following steps: calculating an engine speed difference according to a first engine speed and a second engine speed; calculating an engine target rotating speed difference according to the first engine target rotating speed and the second engine target rotating speed; according to the engine rotating speed difference and the engine target rotating speed difference, the speed difference change rate of a first preset time period between the first moment and the second moment is calculated; calculating an error adjustment torque according to the speed difference change rate and the equivalent rotational inertia of the vehicle; and controlling an automatic transmission of the vehicle to operate according to the error adjusting torque. Therefore, error correction is carried out on the control torque of the automatic transmission according to the rotating speed difference of the clutch in one time period, the automatic transmission is controlled with the appropriate torque when the gear changes, gear shifting impact and pause caused by errors of the clutch are reduced, and the driving experience of a vehicle is improved.

The embodiment of the invention provides a wafer supporting seat, a rotary supporting device, a cleaning device, a wafer rotation speed measurement method and a wafer cleaning method. The wafer supporting seat comprises a supporting assembly; the supporting assembly is connected to the supporting shaft in a swinging manner; the driving wheel is arranged on the supporting assembly; the tachometer wheel is arranged on the supporting assembly, the driving wheel and a rotating shaft of the tachometer wheel are arranged in parallel, and the circumferential outer edge of the driving wheel and the circumferential outer edge of the tachometer wheel are each provided with an annular groove used for supporting a wafer; and the counterweight piece is connected to the supporting assembly and is used for applying swinging force to the supporting assembly. In the application, under the action of the gravity of the wafer, the swinging driving wheel and the speed measuring wheel can automatically align the supporting position of the wafer, the insertion depth of the wafer in the driving wheel and the speed measuring wheel can be kept stable, and the driving wheel and the speed measuring wheel can stably support the wafer and reduce the speed falling probability of the wafer.

The invention relates to the technical field of power control, and discloses a main hydraulic power setting method and device of an excavator, the excavator and a storage medium. The actual power of an engine cooling system is calculated based on the current engine water temperature or the engine intercooling temperature, the actual air conditioner refrigeration power is determined based on the air conditioner refrigeration state, and then the difference between the maximum engine power and the actual power of a hydraulic cooling system, the actual power of the engine cooling system, the actual air conditioner refrigeration power and the preset engine reserved power is obtained; and finally, the target main hydraulic power is applied to a main pump corresponding to the excavator to operate, so that it is guaranteed that the hydraulic main power is in a better state, and the engine power is brought into play to a greater extent.

The embodiment of the invention provides a vehicle demand power prediction method and device, vehicle control equipment and a hybrid vehicle. Relates to the technical field of automobiles. The method comprises the steps that the current gear, the first shaft rotating speed, the second shaft rotating speed, the current accelerator opening degree, the current road slope information and the current vehicle weight information of a target hybrid vehicle are obtained; according to the first shaft rotating speed, the second shaft rotating speed and the gear transmission information of the adopted hybrid power gearbox, the third shaft rotating speed of a driving motor on the target hybrid power vehicle is calculated; according to the first shaft rotating speed of the engine, the second shaft rotating speed of the generator and the third shaft rotating speed of the driving motor, the initial peak value demand power of the target hybrid vehicle is calculated; and according to the current accelerator opening degree, the current road slope information and the current vehicle weight information, the initial peak demanded power is corrected, and the target demanded power of the target hybrid vehicle is obtained. According to the invention, the prediction precision of the demand power is effectively improved, and the optimization target of fuel economy is realized.

The invention provides an explosion-proof motor bearing fault detection method based on frequency domain sparse variational mode extraction, and the method comprises the following steps: S1, collecting a vibration signal of a detected device through a vibration sensor, then intercepting the vibration signal in unit time, and carrying out the mean value removal; s2, constructing a frequency domain sparse variational mode extraction model, deducing an iterative solution algorithm of the model, and extracting fault features from the vibration signals through the iterative solution algorithm; s3, analyzing the time domain waveform and the envelope spectrum of the fault features, calculating the theoretical fault feature frequency of the bearing according to the structural parameters and the rotating speed of the bearing, comparing each spectral line with the theoretical fault feature frequency of the bearing, and determining the fault type of the bearing according to the matching result; weak fault features can still be accurately extracted under multiple interference components, accurate detection of the bearing fault of the explosion-proof motor is achieved, and operation safety of a whole mechanical system is ensured.

The invention provides a resolver angle soft decoding and rotating speed calculation method and device, equipment and a medium, and belongs to the technical field of new energy electric drive. And performing zero value processing on sine and cosine values obtained through outer envelope extraction to obtain tangent values, obtaining rotary transformation angle values through arc tangent look-up, outputting the rotary transformation angle values in eight intervals by comparing the range of the sine and cosine values and the range of the tangent values, and then adding the obtained rotary transformation angle and a zero angle to obtain a final rotary transformation angle output value. The angular deviation of the resolver angle is solved, the angular velocity value is obtained, then the rotating speed is obtained through calculation, and the final output rotating speed is obtained through a first-order low-pass filtering algorithm. The resolver angle value and the rotating speed of the motor can be accurately calculated, so that the control accuracy of the electric drive system is improved.

1. Name of the Design Product: Graphical User Interface for Displaying Control and Indication Status of a Vehicle for an Electronic Device. 2. Use of the Design Product: For an electronic device. 3. Design Key Points of the Design Product: Lies in the graphical user interface. 4. Picture or Photograph that Best Illustrates the Design Key Points: The front view of Design 1. 5. Design 1 is designated as the basic design. 6. Use of the Graphical User Interface: This graphical user interface is used to display the control and indication status of a vehicle. Among them: The front view of Design 1 shows the display interface of the tachometer of a Panamera G3 EXC model car, with the pointer extinguished and a gray dial; The change status diagram of Design 1 shows the display interface of the tachometer and the driving range meter of a Panamera G3 EXC model car. When the power mode is started, the pointer points to 0 and the dial is gray; The front view of Design 2 shows the display interface of the tachometer of a Panamera G3 EXC model car, with the pointer extinguished and a red dial; The change status diagram of Design 2 shows the display interface of the tachometer and the driving range meter of a Panamera G3 EXC model car. When the power mode is started, the pointer points to 0 and the dial is red; The front view of Design 3 shows the display interface of the tachometer of a Panamera G3 EXC model car, with the pointer extinguished and a dark green dial; The change status diagram of Design 3 shows the display interface of the tachometer and the driving range meter of a Panamera G3 EXC model car. When the power mode is started, the pointer points to 0 and the dial is dark green; The front view of Design 4 shows the display interface of the tachometer of a Panamera G3 Turbo model car, with the pointer extinguished and a gray dial; The change status diagram of Design 4 shows the display interface of the tachometer and the driving range meter of a Panamera G3 Turbo model car. When the power mode is started, the pointer points to 0 and the dial is gray; The front view of Design 5 shows the display interface of the tachometer of a Panamera G3 Turbo model car, with the pointer extinguished and a red dial; The change status diagram of Design 5 shows the display interface of the tachometer and the driving range meter of a Panamera G3 Turbo model car. When the power mode is started, the pointer points to 0 and the dial is red; The front view of Design 6 shows the display interface of the tachometer of a Panamera G3 Turbo model car, with the pointer extinguished and a dark green dial; The change status diagram of Design 6 shows the display interface of the tachometer and the driving range meter of a Panamera G3 Turbo model car. When the power mode is started, the pointer points to 0 and the dial is dark green; The front view of Design 7 shows the display interface of the tachometer of a Panamera G3 Turbo S PHEV model car, with the pointer extinguished; The change status diagram of Design 7 shows the display interface of the tachometer and the driving range meter of a Panamera G3 Turbo S PHEV model car. When the power mode is started, the pointer points to 0. 7. Human-computer interaction method of the graphical user interface: For each design, the main view represents the state where the vehicle is not started. As the user starts the vehicle, the main view changes to the corresponding changed state diagram. 8. Other circumstances that need to be explained: Designs 1, 2, 3, 4, 5, and 6 claim protection for colors.

The invention discloses a motor production line defect detection and diagnosis method, and belongs to the technical field of production quality optimization, and the method specifically comprises the steps: collecting the rotating speed of a motor during operation, and recording the weight of an object carried by the motor each time; noise generated when the motor works is collected, environment noise is filtered, and motor noise is obtained; the method comprises the following steps: dividing the weight of an object needing to be carried by a motor into a plurality of grades, respectively carrying out linear fitting on the change relation of motor noise along with the rotating speed and the change relation of motor noise along with the load under different grades, and calculating the fitting degree of the noise and the rotating speed and the fitting degree of the noise and the load after linear fitting; when the fitting degree of the noise and the load is high, calculating the maximum load of the motor by adjusting the load, and when the fitting degree of the noise and the rotating speed is high, calculating the maximum rotating speed of the motor by adjusting the rotating speed of the motor; and the motor with the difference value between the maximum load and the maximum rotating speed and the set value larger than a preset threshold value is judged to be unqualified.

The invention provides a self-adaptive control method and system for an extrusion screw of a plastic extruder, and relates to the technical field of plastic recovery and regeneration, and the method comprises the following steps: collecting operation data of the plastic extruder; calculating a change trend and an effective value according to the machine head melt pressure; a three-level partition model is constructed, a pressure deviation value is calculated based on the effective value and the target reference value, and a pressure control area is generated according to a comparison result of the pressure deviation value and a pressure threshold value; performing consistency judgment on the change trend and the pressure demand direction to generate an adjustment coefficient, and performing step length correction by combining a pressure control region and a motor load current to generate a rotating speed adjustment amount; the to-be-executed rotating speed of the screw is calculated in combination with the real-time rotating speed of the screw, acceleration limiting processing is carried out to generate the target rotating speed of the screw, and the target rotating speed is coded into a control instruction to be sent to the driving unit, so that the self-adaptive control effect of the extrusion screw can be achieved, and false pressure fluctuation caused by material hardness change is effectively prevented; the extrusion stability and the response speed are obviously improved.

The invention relates to the technical field of motor control, and discloses a motor output power estimation method, control method and device, and the estimation method comprises the steps: obtaining a motor q-axis current, a damping coefficient, a rotating speed, a mechanical angular frequency, a permanent magnet flux linkage parameter and the number of pole pairs under a rotating coordinate system; estimating a motor output torque based on the motor q-axis current, the damping coefficient, the mechanical angular frequency, the permanent magnet flux linkage parameter and the number of pole pairs under the rotating coordinate system; and calculating motor output power according to the motor output torque and the rotating speed. According to the method, the output power of the motor can be accurately estimated only according to the output torque and the rotating speed of the motor without increasing extra hardware cost. The current output power is estimated by directly calculating the motor output torque, various losses of hardware and a motor body do not need to be considered, the accuracy of calculating the output power is improved, and the power estimation calculation process is simplified.

The invention discloses a control method of a multi-stage liquid-driven piston compressor system. The control method comprises the following steps: step 1, calculating geometric parameters of each stage of compressor; secondly, the pressure of the air inlet end is recognized through an acquisition card, and the pressure ratio of each stage is calculated according to the required exhaust pressure value, the compressor stage number and other parameters; thirdly, the rotating speed ratio of each stage of compressor is calculated according to the pressure ratio, the volume of each stage of cylinder and the number of cylinders; fourthly, the maximum compressor rotating speed is screened out according to the rotating speed ratio of all stages of compressors with the maximum motor power and the maximum pump station oil pressure parameter as limits; and fifthly, the reversing frequency value of a reversing mechanism is calculated according to the rotating speed of each stage of compressor, and therefore the effect of changing design working conditions is achieved.

The invention relates to the technical field of design optimization, in particular to a control design optimization method and system for a permanent magnet synchronous motor. The method comprises the following steps: obtaining and measuring a stator three-phase voltage value and a current value of the PMSM and a motor rotating speed in real time; constructing a d-q axis motor equivalent circuit model, and calculating an available boundary curve of the voltage of the weakening area by combining the three-phase voltage value of the stator and the rotating speed of the motor; determining a dynamic safety margin coefficient of a weakening area voltage-current working area based on the weakening area voltage available boundary curve; judging the motor rotating speed of the permanent magnet synchronous motor; by introducing voltage-current working area modeling and a dynamic safety margin coefficient, accurate current control and adaptive inverter compensation of the PMSM in a weak magnetic area are realized, and the problems of poor stability, insufficient voltage margin and incomplete compensation in traditional high-speed control are solved.

The invention relates to a rotation speed sensor automatic calibration system capable of increasing disturbance, which comprises a tested gear, a gear disc, a driving motor, a rotating shaft, a rotation speed sensor, a tachometer, a data acquisition unit, a main control unit and a disturbance applying mechanism, the disturbance applying mechanism comprises a synchronous ring body, a thermal bimetallic strip, a simulation tooth, a connecting rod, an electric control trolley, a locking mechanism, a heating piece, a first electric push rod and a first abutting plate, the heating piece can be brought to the inner sides of different storage grooves through the moving trolley, the heating piece emits heat to enable the thermal bimetallic strip in the storage grooves to deform, the simulation tooth is driven to be retracted into the storage grooves, and the simulation tooth is driven to rotate; a tooth missing state is simulated, when the main control unit sends a control instruction to the driving motor, the driving motor can drive the synchronous ring body and the tested gear to rotate through the rotating shaft, the synchronous ring body is in the tooth missing state and can apply vibration disturbance, and the rotating speed, collected by the rotating speed sensor, of the tested gear can be transmitted to the main control unit for comparison and calibration; the calibration accuracy can be improved by applying different disturbances.