4447 results about "Brushless motors" patented technology

The invention is suitable for the technical field of brushless motor control, and provides an intelligent brushless motor and a control method thereof, and the method is applied to a control system of the intelligent brushless motor. The system comprises a data acquisition module, a model construction module, a training tuning module, a model verification module, a parameter setting module, an operation application module, a wireless communication module, a memory, an alarm, a processing center and an intelligent mobile terminal. The data acquisition module, the model construction module, the training optimization module, the model verification module, the parameter setting module, the operation application module, the wireless communication module, the memory and the alarm are respectively connected with the processing center; the invention also provides an intelligent brushless motor. According to the method, the AI model is constructed and trained by collecting the daily motor operation quality data, and the operation control parameters are matched according to the model, so that various operation quality abnormalities are prevented, and accurate control of the motor is ensured.

The invention provides a brushless motor attitude detection and balance control method and system based on a gyroscope, and relates to the technical field of control, and the method comprises the steps: collecting angular velocity and acceleration data through a six-axis gyroscope, carrying out the noise reduction through wavelet transform, and carrying out the attitude calculation through the combination of an extended Kalman filter and a quaternion algorithm. A rotor position signal is obtained through a magnetic encoder, nonlinear compensation is carried out, and rotating speed data are calculated. A motor state is modeled by adopting a long-short-term memory network, a double-layer adaptive fuzzy neural network controller is constructed, and attitude error compensation and rotation speed fluctuation suppression are realized. A controller model is optimized through particle swarm optimization and a genetic algorithm, a compensation current vector is corrected in real time, and the control precision and stability of the brushless motor are improved. According to the method, the operation efficiency and the dynamic response capability of the brushless motor are effectively improved.

The invention relates to the technical field of brushless motor testing, and discloses a test adjusting method and system for an intelligent brushless motor, and the method comprises the steps: carrying out the real-time monitoring of the current, rotating speed and load characteristics of the brushless motor, obtaining the operation data of the motor, and obtaining a motor working mode recognition result; constructing a motor parameter hierarchical optimization scheme; performing dynamic optimization to obtain a motor adaptive control parameter set; performing rolling optimization solution to obtain a motor prediction control instruction sequence; performing multi-objective optimization calculation to obtain a motor multi-performance balance adjustment scheme; a motor multi-performance balance adjustment scheme is integrated into a digital twin test platform, simulation verification is carried out on the performance of the brushless motor under different working conditions, a motor test adjustment strategy is obtained, the working mode of the motor can be recognized in real time, parameter optimization and performance prediction can be carried out based on historical data and the current state, and the stability of the motor test adjustment strategy is improved. Therefore, the optimal operation state of the motor under different working conditions is realized.

The invention relates to the technical field of motor control, and discloses a brushless motor adaptive control method and system based on artificial intelligence, and the method comprises the steps: collecting the multi-point temperature data of a motor, building a thermal dynamic model, and reconstructing the complete temperature field distribution; identifying a relation function between motor parameters and temperature, and establishing a temperature sensitive parameter model; in combination with temperature field distribution and a temperature sensitive parameter model, learning long-term influence of control actions on temperature distribution, and predicting temperature evolution trends under different control strategies; constructing a multi-objective optimization control strategy, and generating a motor control instruction and a heat dissipation control instruction; dynamically selecting an optimal heat dissipation strategy combination according to the generated control instruction, the current working condition and the predicted heat influence; according to the invention, high-precision control and thermal management optimization of the brushless motor in a temperature change environment are realized.

According to the body drying machine, a plurality of air blowing barrels can blow air outwards through a plurality of air blowing openings respectively, each air blowing barrel comprises a brushless motor, and the brushless motors can provide strong wind power so that the body can be quickly blow-dried. The brushless motor is high in power, and the lithium battery assembly is arranged to supply power to the brushless motor, so that use safety can be guaranteed, and family circuit short circuit caused by overhigh power is avoided. Moreover, under the action of the lifting mechanism, the lifting frame can ascend and descend relative to the fixed frame, so that the lifting frame drives the blowing cylinder to ascend and descend; under the action of the rotating mechanism, the blowing cylinder can swing relative to the lifting frame so as to enlarge the blowing range. In conclusion, the air outlet position of the body dryer can be adjusted up and down, the air outlet range is large, the wind power is strong, the body can be quickly dried, and the air drying effect is good.

The present invention relates to the technical field of brushless electric motor cooling, and specifically relates to a brushless electric motor cooling device, comprising an electric motor body, a transmission shaft, a liquid storage tank and a top cover, and further comprising a cooling assembly, wherein the transmission shaft is fixedly mounted in the electric motor body; the cooling assembly is fixedly mounted on the electric motor body; the liquid storage tank is fixedly mounted at one end of the cooling assembly; and the top cover is fixedly mounted at the other end of the cooling assembly. The present invention solves the problem of existing brushless electric motors being easily damaged during a high-load and high-speed rotation process caused by simple air cooling or water cooling being unable to provide a satisfactory cooling effect for excessive heat generated by the brushless electric motors when rotating at high speed for a long time. The present invention enables a brushless electric motor to be cooled rapidly, significantly improving the cooling effect for the brushless electric motor and prolonging the service life thereof.

The invention relates to the field of PID control, and provides a tread calender rotating speed PID control method and system, a storage medium and equipment. The tread calender rotating speed PID control method comprises the following steps: processing an initial solution space of a plurality of to-be-optimized parameters based on Logistic-Tent chaotic mapping and dynamic reverse learning to obtain an initial population matrix of a Sabot swarm algorithm; according to the evaluation function, calculating the initial fitness of the soloat group individuals, and updating the global optimal position of the soloat individual with the optimal fitness to the current optimal position; executing a salmons swarm algorithm, and searching the to-be-optimized parameters by simulating a search behavior or an attack behavior of a salmons; in the process of executing the sodat swarm algorithm, if it is judged that the algorithm enters a development stagnation state, executing a transverse crossing strategy and a longitudinal crossing strategy to enable the algorithm to get rid of the development stagnation state; and when a set termination condition is satisfied, outputting a solution corresponding to the current optimal position, and controlling the direct current brushless motor. The method can improve the response speed.

The invention discloses equipment for detecting the construction quality of a supporting structure of an expressway tunnel and a control method of the equipment, and relates to equipment for detecting the construction quality of a wall tunnel of the supporting structure of the expressway tunnel during the construction period. An electric push rod is controlled to drive a motor to rotate to ensure that the radar antenna is tightly attached to the tunnel wall surface, and direct-current brushless motors at joints are driven to rotate by observing the tunnel wall surface to prevent the radar antenna from colliding with obstacles such as reinforcing steel bar heads on the wall surface. The method can effectively avoid obstacles on the wall surface of the supporting structure in the tunnel construction period in the detection process, guarantees that the radar antenna is constantly attached to the wall surface of the tunnel in the detection state, solves the problem that the surface of the tunnel lining is uneven in the construction period, and can obviously improve the detection efficiency and quality compared with a traditional detection technology. The method has good environment adaptability, and it is ensured that a detection instrument and the lining surface are always in a good contact state under the complex environment condition.

The invention provides an electronic temperature protection control method for a direct current brushless motor, and relates to the technical field of motor control, and the method comprises the steps: temperature sampling: employing a controller or a motor internal sensor and a winding resistor to estimate and collect a temperature signal in real time; temperature filtering: eliminating noise interference by adopting mean value or Kalman filtering; temperature comparison: comparing the filtered temperature value with a preset multi-level threshold value (from one level to three levels); and protection control is carried out, and measures such as power reduction, current limiting or driving signal closing are taken according to the threshold exceeding degree. Through multi-point sampling, heat conduction installation, dynamic filtering parameter adaptation and threshold setting based on the insulation grade, the temperature monitoring precision and response speed are improved, the problems of response lag and cost of traditional hardware protection are avoided, dynamic and precise temperature protection of the motor is achieved in combination with a thermal response time constant and temperature change rate pre-judgment mechanism, and the reliability of the motor is improved. The service life of equipment is effectively prolonged.

The invention discloses an anti-unmanned aerial vehicle power rotary flying rope net capturing device and a control method thereof, and belongs to the technical field of unmanned aerial vehicles. An electromagnet circuit is controlled to be switched on through a relay, so that an electromagnet instantly loses attraction force, and the four brushless motors are rapidly, synchronously and accurately released; the brushless motor is used as a power source for unfolding the catching net to drive the catching net to unfold and cover a target. Wherein the magnet vane is attracted with the electromagnet when the electromagnet is powered off so that the four corners of the catching net can be fixed to the unmanned aerial vehicle, the influence of the electromagnet on the brushless motor is effectively isolated in the whole process, and the flight stability is ensured. The net ring can rotate freely, the direction of the catching net traction rope is kept stable, and winding with a motor or a propeller is avoided; the ball bearing and the magnet vane jointly ensure the height of the catching net traction rope, the catching net device is prevented from being separated from the motor, and the whole device can achieve synchronous and safe falling of all components and achieve the recovery function.

The invention provides a brushless motor multi-axis cooperative control method and system for an industrial robot, and relates to the technical field of control, and the method comprises the steps: processing the real-time parameters of a brushless motor of each joint axis through constructing an extended dynamic model, and obtaining a temperature drift coefficient and a load inertia parameter; a self-adaptive pre-compensation model, a neural network compensator and a recurrent neural network prediction model are combined, a torque control instruction is output, a three-phase current prediction value is calculated, a distributed model prediction controller is adopted to generate an optimal switching sequence, multi-axis cooperative control is achieved, and the system stability and the response speed can be effectively improved.

The invention relates to the technical field of direct current motors, and particularly discloses a direct current brushless motor driving method. A central electric signal, a first electric signal, a second electric signal and a third electric signal of a motor stator winding are analyzed by using a signal processing and analysis algorithm based on deep learning, so that implicit features in each electric signal are captured; and after difference calculation is carried out on the center electric signal feature and other electric signal features, query code representation of the rotor rotation position is obtained in a feature query matching mode, so that the rotor rotation position is determined. Therefore, accurate judgment on the rotation position of the rotor can be realized through artificial intelligence and a deep learning algorithm, and the influence of noise interference and external condition change is reduced not only through a hardware component mode, so that the flexibility and generalization ability are improved through a more intelligent direct current brushless motor driving mode.

The invention relates to the technical field of motors, in particular to a Hall support and a coreless brushless motor, and a Hall plate is embedded in one side of a support body; a Hall plate mounting groove is formed in one side of the support body, at least two positioning columns are arranged in the Hall plate mounting groove, positioning holes matched with the positioning columns are formed in the Hall plate, and the positioning columns are inserted into the positioning holes; a Hall device is arranged on the Hall plate, a device groove matched with the Hall device is arranged in the Hall plate installation groove, and the Hall device is embedded in the device groove. Compared with the prior art, the Hall bracket and the coreless brushless motor have the advantages that a Hall device and a circuit welding point are effectively protected and isolated through a unique bracket structure design, and an enameled wire led out of a winding wire cup is prevented from being in contact with a PCB outgoing line welding point when the Hall position is adjusted, so that the risk of short-circuit damage of a Hall PCB is reduced, and the service life of the Hall device is prolonged. The reliability and stability of the motor are improved, and the problem of potential short circuit risk existing in the Hall alignment process in the prior art can be effectively solved.

The invention relates to the technical field of unmanned aerial vehicle flight control, in particular to an unmanned aerial vehicle flight control and monitoring integrated system for power transmission tower inspection, and the system comprises a flight monitoring module which is used for obtaining the wind speed in the environment where an unmanned aerial vehicle is located, the rotating speed of each rotor wing of the unmanned aerial vehicle, and the inclination angle of the unmanned aerial vehicle body; the flight control module is used for acquiring the disturbance value of each rotary wing in each preset time period and the inclination fluctuation degree of the unmanned aerial vehicle body; disturbance factors of the positions of all the rotary wings at the current moment are obtained, and the power of brushless motors in all the rotary wings at the current moment is adjusted; the flight obstacle avoidance module is used for planning a flight path for avoiding obstacles; the tower monitoring module is used for monitoring damage information of the transmission tower; and the wireless communication module is used for transmitting the damage information to a ground station. By correcting the flight attitude of the unmanned aerial vehicle, the stability of the fuselage during flight of the unmanned aerial vehicle is improved, and then the inspection efficiency and quality of the transmission tower are improved.

The present invention relates to the technical field of electric motors, and specifically relates to a three-phase direct-current brushless electric motor, comprising: an electric motor housing, an inner shell, a rotating shaft, a rotor, a stator, a Hall sensor, and a circuit protection device, wherein the inner shell is fixedly mounted at the upper end of the electric motor housing; the rotating shaft is rotatably connected to the electric motor housing; the rotor and the stator are mounted inside the inner shell; and the Hall sensor is rotatably fitted with the rotating shaft. The circuit protection device is located above the rotor; during operation, when the rotating shaft is stuck due to a fault, or when there is an overload, the circuit protection device controls the disconnection of a circuit, thereby realizing the power-off self-locking of the electric motor by means of a load control module, thus avoiding the demagnetization of a rotor permanent magnet at a high temperature caused by heating of the electric motor, and avoiding affecting the rotation speed and normal use of the electric motor.

The present disclosure provides a method and apparatus for measuring a rotational speed of a motor, a motor driving circuit, and an air conditioner. The method comprises: in response to a motor stop instruction, controlling a target motor to decelerate to a setting value; adjusting a motor driving circuit and acquiring the maximum phase current value of the target motor; and on the basis of a pre-stored correspondence between rotational speeds and currents as well as the maximum phase current value, calculating the rotational speed of the target motor. According to the method provided by the present disclosure, the current rotational speed of a motor can be calculated on the basis of a sampled current of a brushless motor without adding a counter-electromotive force measurement circuit and other circuits, so as to complete sensorless control of the brushless motor. The present invention has the characteristics of high integration, compact structure and low cost.

The invention discloses a wireless cooperative control system and method for a multi-node brushless motor, and the system employs a layered architecture design, and comprises a main control layer, a drive layer, a communication layer, and a software layer. The master control layer is composed of a master node and serves as a task instruction scheduling center of the system, the driving layer is composed of N slave nodes, and N is larger than or equal to 3; the driving layer drives the brushless motor by executing an FOC vector control algorithm and monitors the state of the brushless motor; the communication layer constructs a star network topology based on an ESP-NOW protocol, a direct communication link is established between a master node and N slave nodes, and multi-node cooperative control is realized by adopting a dynamic channel switching mechanism and a timestamp alignment mechanism; and the software layer establishes communication with the main control layer through a USART serial port, receives the state data of the brushless motor of each slave node concentrated by the main control layer, and sends an instruction to the main control layer at the same time. Not only are wireless multi-node synchronization and anti-interference problems solved, but also high-precision motor control is realized.

The invention provides a hydrometeorological unmanned ship based on a visual inertia laser radar and an SLAM navigation method thereof.The unmanned ship comprises a ship protection cover, a ship shell, the laser radar, a depth camera, an IMU module, an intelligent development board and the like, and the laser radar, the depth camera and the IMU module are connected with the intelligent development board; the unmanned ship further comprises a Beidou positioning module, a sensor module, an STM32 driving board, a brushless motor driving module and an electronic speed regulator, the unmanned ship can achieve precise positioning and path planning of a ship body, environment monitoring and sampling and has the functions of automatic cruise, obstacle avoidance and the like, laser radar information and binocular vision IMU attitude estimation are fused through tight coupling, and the navigation precision is improved. According to the SLAM front-end attitude estimator, a VILO front-end attitude estimator is formed, and laser radar observation is added to further limit the attitude, so that the accuracy and robustness of the SLAM front-end attitude estimator in indoor and outdoor environments are improved.

The invention relates to the technical field of brushless motor testing, and discloses an assembly testing method, device and equipment of a brushless motor. The method comprises the following steps: performing data stream segmentation processing on multi-source sensor data in the brushless motor assembling process to obtain a normal data block and a drift data block; carrying out dimension reduction processing to obtain a low-dimensional feature vector; training through a deep multilayer sparse regularization time-varying transfer learning network model to obtain a first assembly state prediction model; processing the assembly characteristic data collected in real time to obtain a multi-dimensional index prediction value and an assembly quality score; performing multi-mode anomaly detection and diagnosis to obtain an anomaly report; reinforcement learning and incremental learning are carried out based on the abnormal report, a second assembly state prediction model is obtained, and a corresponding brushless motor assembly strategy is generated, the brushless motor assembly test method is adaptive and intelligent, and the test accuracy, efficiency and self-optimization capability are improved.

Provided in the present invention are a hybrid excited axial brushless motor and a power generation method thereof. The hybrid excited axial brushless motor comprises a housing and a rotating shaft rotatably fixed in the housing. Seven parts, i.e. a first exciter stator, a first magnetic shunt ring rotor, a first permanent magnet rotor, an armature stator, a second permanent magnet rotor, a second magnetic shunt ring rotor and a second exciter stator are successively mounted in the housing in the axial direction, air gaps being provided between every two adjacent parts. The first permanent magnet rotor and the second permanent magnet rotor are symmetrically arranged and are both rotatably fixed to the rotating shaft; the first magnetic shunt ring rotor and the second magnetic shunt ring rotor are symmetrically arranged and are both fixedly connected to the rotating shaft; the first exciter stator and the second exciter stator are symmetrically arranged and are both fixedly connected to the housing. By means of an armature stator support, the armature stator is fixedly connected to the housing. The present invention achieves brushless hybrid excitation, and increases the power density and the power generation capacity of motors.

The invention provides a dual-rotor water-air amphibious unmanned aerial vehicle with a plume-like electric eel structure, which comprises a main body assembly, and the main body assembly comprises a triangular bracket, a fuselage main body, an electric eel driving mechanism, a rotary connecting piece, a U-shaped clamping groove, the plume-like electric eel structure and a load platform. According to the unmanned aerial vehicle, the line-like electric eel structures are arranged on the two sides of the fuselage main body, so that the unmanned aerial vehicle can enter and exit water without an underwater propeller or mode switching, and the structures are low in movement energy consumption, so that the unmanned aerial vehicle has the capability of working for a long time and can be flexibly switched between an air mode and a water mode; meanwhile, the system has excellent performances such as ultra-silence, high endurance and high efficiency; according to the invention, the attitude control is realized through a double-rotor structure consisting of the waterproof brushless motor, the output shaft and the folding propeller assembly and through the tilting mechanisms which are mounted front and back, the tilting mechanisms enable the rotors to deflect, different attitudes and motions can be realized through different tilting directions and tilting speeds, and the attitude stability and the motion control are enhanced.

The invention provides a demonstration experiment device for an internal friction effect in gas fluid mechanics, and belongs to the technical field of teaching demonstration devices. The problem that a traditional teaching aid is single in function, dispersed in data and insufficient in visualization, so that the experiment effect is abstract is solved. Comprising a main body shell, the main body shell is hermetically connected with a vacuum cover, the vacuum cover is filled with fluorescent powder, and the vacuum cover is connected with an air extractor through an air valve; the middle of the main body shell is an area communicated with the interior of the vacuum cover, the periphery of the main body shell is a sealed shell, the middle of the main body shell is provided with an impeller rotating speed adjusting mechanism, the top of the sealed shell of the main body shell is provided with a display screen, and the sealed shell of the main body shell is internally provided with a high-speed brushless motor and a distance adjusting mechanism; by adjusting the air pressure, the rotating speed of the impeller and the distance, students can observe the conversion of gas flow from laminar flow to turbulent flow and the stagnation phenomenon of the impeller in a vacuum environment, and the linear relation between internal friction and gas density is verified.

The invention relates to a brushless electric machine (10), in particular a brushless DC motor (12), with a stator (14) and a rotor (18) arranged rotatably within the stator (14) relative to it, wherein the rotor (18) has a cylindrical base body (20) which is non-rotatably connected to a machine shaft (16) and carries a plurality of permanent magnets (24) on its outer circumference (22), and wherein the stator (14) has a stator winding (32) with a plurality of single-tooth windings (28) for driving the rotor (18) by means of an electrically generated rotating magnetic field. It is proposed that the permanent magnets (24) of the rotor (18) are fixed by means of a thin-walled reinforcement (56) radially surrounding them, wherein the reinforcement (56) has a modulus of elasticity of at least 150 GPa and / or a yield strength of at least 600 MPa. Furthermore, the invention relates to a method for manufacturing the brushless electric machine (10).

The invention relates to the technical field of motor testing, and discloses an intelligent diagnosis system and method for a brushless motor of a vehicle water pump, and the method comprises the steps: collecting an actually-measured first vibration mean value, and obtaining an estimated second vibration mean value of a brushless motor to be tested at the r + v rotating speed based on the actually-measured first vibration mean value; acquiring an actually measured second vibration mean value of the brushless motor to be measured at the r + v rotating speed, and judging whether the brushless motor to be measured has abnormal performance according to the estimated second vibration mean value and the actually measured second vibration mean value; the process is repeated until abnormal performance occurs or r is equal to R, circulation is ended, the temperature reference value, the temperature mean value and the electrical measurement value are input into a first machine learning model, and an electrical correction value is obtained; intercepting an abnormal wave band in the actual electrical oscillogram, and inputting the abnormal wave band into a second machine learning model in an image form to obtain a fault type of the brushless motor to be tested; according to the invention, the fault type of the brushless motor can be diagnosed with high accuracy.

The invention relates to the field of rotor anti-oxidation paint surface drying, in particular to a brushless motor production rotor anti-oxidation paint surface drying device which comprises a drying box, a chain conveyor and the like. A chain conveyor is arranged on the drying box; the drying box is provided with a mounting frame; the drying box is provided with a frame body, and a chain part of the chain conveyor penetrates through the mounting frame, the drying box and the frame body. Through the arrangement of the connecting plate, the electric clamping device, the first mounting plate, the second mounting plate, a first spring piece, a rotating shaft rod, a servo motor, conveying belts and a limiting piece, and through the mode that the two conveying belts on the upper portion and the corresponding conveying belt on the lower portion grind away paint attached to each other, the phenomenon that in the prior art, after clamping work of the clamping device is finished each time, paint on the conveying belts on the upper portion is scraped away is avoided; the problems that paint accumulated on the clamping device needs to be cleaned by manual shutdown in the prior art, the workload of workers is increased, and meanwhile the production efficiency of the rotor is seriously affected are solved.

The invention relates to the technical field of knobs, in particular to a knob and a control method thereof. The knob comprises a control circuit board, a mode switching device, a position detection device, a brushless motor, a rotary support, a display screen device and a rotary shell. The brushless motor comprises a stator and a rotor located in the stator. The stator is elastically connected with the control circuit board; a mode switching device is arranged between the stator and the control circuit board; a position detection device is arranged in the rotor and is used for detecting the rotation condition of the rotor; the end, away from the control circuit board, of the rotor is connected with one side of the rotating support, the other side of the rotating support is connected with the rotating shell to form a containing cavity, and a display screen device is arranged in the containing cavity. Therefore, the knob is simple in structure, high in reliability and capable of achieving various knob hand feelings.

The invention relates to the field of voltage data processing, in particular to a voltage data processing method and device for zero point detection and a direct current brushless motor. The method comprises the following steps: respectively monitoring and acquiring voltage values of U, V and W phases; if the voltage value of one preset period is accumulated in each phase, generating a first change diagram, and calculating a first deviation value according to the generated first change diagram; translating a curve graph in the first change graph to obtain a second change graph, and calculating a second deviation value according to the second change graph; obtaining a preset number of first change diagrams corresponding to the preset periods of which accumulation is completed, and calculating a third deviation value according to the obtained first change diagrams; obtaining a fourth deviation value according to the first deviation value, the second deviation value and the third deviation value; and in the next preset period of the preset period T, correcting the latest acquired voltage values of the three phases according to the fourth deviation value to obtain corrected voltage values of the three phases. According to the invention, the problem of insufficient accuracy of voltage data is solved.

The present disclosure provides a male sexual stimulation device. The male sexual stimulation device includes a shell, a brushless motor, a first micro control unit (MCU), a screw rod, a sliding block and a connector. The shell is provided with a first accommodating chamber. The brushless motor is arranged in the first accommodating chamber. The first MCU is arranged in the first accommodating chamber and is electrically connected to the brushless motor. The screw rod is connected to an output end of the brushless motor and rotates in a reciprocating manner under the driving of the brushless motor. The sliding block is in threaded connection to the screw rod and does a reciprocating motion under the driving of the screw rod. The connector is connected to the sliding block and moves in a reciprocating manner with the sliding block; and the connector is configured to connect a flexible sleeve.

According to the pure hardware PID current control system and method based on the direct current brushless motor provided by the invention, the negative voltage interference generated by electromagnetic induction is directly filtered in the bus current signal acquisition stage through the cooperation of the current sampling module and the bus negative voltage elimination module; the problem of signal distortion caused by negative voltage in a traditional sampling circuit is eliminated, and the current effective value detection precision is improved; the PID control module constructed based on pure hardware calculates a difference value between a target voltage and an actual voltage in real time through an analog circuit, and generates a proportional, integral and differential composite compensation signal, so that a PWM modulation circuit can adjust duty ratio output in real time according to the compensation signal, and it is ensured that a bus current of a motor driver is rapidly converged to a target value; the whole scheme does not need to depend on a microcontroller and a complex software algorithm, closed-loop current control is achieved through discrete devices, and the system cost is reduced.

The invention discloses a variable speed brushless motor methanol pump, comprising a methanol pump and a brushless motor, wherein the brushless motor is integrated in the methanol pump and drives the methanol pump to work, the control board of the brushless motor is integrated in the methanol pump to control the brushless motor to work, and the output end of the brushless motor drives the rotating parts of the methanol pump to work; an oil outlet connector, an oil inlet connector and a connector are provided on the methanol pump, the connector is electrically connected to the control board of the brushless motor, the control board is connected to the engine crankshaft signal, and the engine crankshaft signal is converted to control the rotation of the brushless motor; or the control board is connected to the ECU using a CAN communication method to send a signal, and the ECU uses a CAN communication method to send a signal to control the rotation of the brushless motor. The invention can make the oil delivery pump change the output flow and pressure, and maintain a relatively high pressure of 12 bar to weaken the pipeline-level fuel filter resistance, which can meet the requirements of the injection pump with large flow.