34 results about "Dc motor speed control" patented technology

The invention relates to a wheel speed sensor testing machine, which is characterized in that it comprises a base, a casing, a DC motor, a ring gear and a wheel speed sensor mounting frame. When the present invention is used, the wheel speed sensor is vertically or horizontally clamped on the wheel speed sensor mounting frame, so that the probe of the wheel speed sensor is close to the ring gear, and when the DC motor drives the ring gear to rotate, the induced voltage generated by the wheel speed sensor Inputting it into the oscilloscope, the tester can easily check the working condition of the wheel speed sensor, and the tester can adjust the speed of the DC motor through the speed control knob to detect the wheel speed sensor, which is very convenient.

The invention provides a DC motor speed control system. The DC motor speed control system comprises a brush DC motor, a power supply, a current-voltage converter, a filter amplification circuit, a shaping device and a microprocessor, wherein the brush DC motor is arranged on a wheelchair, the power supply is used for providing power for the brush DC motor, the current-voltage converter is connected with the brush DC motor and is used for converting a pulse current flowing through the brush DC motor to a pulse voltage, the filter amplification circuit is connected with the current-voltage converter and is used for filtering and amplifying the pulse voltage, the shaping device is connected with the filter amplification circuit and is used for shaping the pulse voltage subjected to filtering and amplification to a square wave, the microprocessor is provided with a speed measurement unit and a speed regulation unit, the speed measurement unit is connected with the shaping device and is used for capturing the square wave to obtain a pulse frequency and calculating a rotational speed of the brush DC motor according to the pulse frequency and a preset rule, and the speed regulation unit is connected with the brush DC motor and is used for adjusting the rotational speed of the brush DC motor so as to further regulate a travelling speed of the wheelchair. The invention also provides a speed detection method for the DC motor speed control system.

The invention discloses a DC motor rotating speed control circuit and an electronic device equipped with same. The DC motor rotating speed control circuit comprises a start unit, a speed regulation control unit, a mirror image control unit, and a filtering freewheeling unit. The start unit receives an enable signal transmitted from a system controller, and starts an internal circuit of the start unit and the speed regulation control unit. The speed regulation control unit receives a speed regulation control signal transmitted from the system controller, adjusts the internal circuit structure of the speed regulation control unit, and performs speed regulation control. The mirror image control unit controls and adjusts the current of a DC motor according to the speed regulation control of the speed regulation control unit. The filtering freewheeling unit is used for filtering an interference signal of the adjusted current of the DC motor and back flowing complementary energy. The DC motor rotating speed control circuit adjusts the current of the DC motor by means of the speed regulation control unit and the mirror image control unit so as to prevent a loss caused by overlarge internal current of the DC motor.

In speed control that is performed within a single operating cycle of a printer, three-level control of ON control, OFF control, and chopper control, is performed in place of the two-level control of ON control and OFF control, to effectively suppress speed variations due to load variations within a single operating cycle, even in small printers provided with DC motors having small output torques. In a printer comprising a DC motor 7, a paper feeding unit 5 that includes a paper feeding roller that uses the DC motor as the driving source, and a printing mechanism unit 2, for printing, in use of the printing mechanism unit 2, onto paper that is advanced by a specific amount by the paper feeding unit 5, an encoder 10 for outputting pulse signals according to the rotation of the DC motor 7 is provided. The encoder 10 is provided with a pulse forming region for forming a pulsed signal, on the periphery of an encoder plate, where this pulse forming region is provided with a non-uniform spacing region in a section within a uniform spacing region.

The invention discloses a brush-less direct current motor speed regulating method and a speed regulating device using the same. The brush-less direct current motor speed regulating method includes steps that capturing PWM waveform output from a comparison module; connecting the PWM waveform with an interrupt signal, entering interrupt immediately when a high level is detected in the PWM waveform, and enabling a current sampling module to immediately sample the current which flows through a bus resistor; sending the sampled current to a current regulator, and enabling the current regulator to output a duty ratio according to a preset current and the sampled current; using the duty ratio to control the on and off of a bridge power tube in a three-phase bridge type inverter, and controlling the effective voltage exerted to the brush-less direct current motor to regulate the rotating speed thereof. The brush-less direct current motor speed regulating method is capable of solving the problems of high cost and low reliability of the existing phase current sampling, the motor torque pulsation of the direct current bus sampling and the like.

The invention discloses a DC motor drive circuit and electronic equipment with the circuit, wherein the DC motor drive circuit includes: a pulse signal generation unit, a control unit and a drive unit; the pulse signal generation unit is used to generate a DC motor drive pulse signal; the control unit is used to adjust the duty cycle of the drive pulse signal; the drive unit is used to send the adjusted drive pulse signal to the DC motor to drive the The DC motor turns. The invention realizes the speed control of the DC motor by using discrete electronic components to form a pulse signal generating unit, a control unit and a driving unit, thereby simplifying the design difficulty and reducing the production cost.

The invention designs an LQR optimized brushless DC motor speed regulating neural network PID controller, which is used to improve the control performance of the traditional neural network PID controller and the traditional LQR optimized PID controller. The designed LQR optimized neural network PID controller (LNPID) uses BP neural network to control the K of the controller P , K I , K D The gain is adjusted to improve the dynamic characteristics and robustness of the controller; the three-layer BP neural network adopted in the present invention has strong nonlinear mapping ability, and can effectively suppress the nonlinear situation of the controlled object; but the traditional BP Neural network is an optimization method of local search, therefore, the present invention quotes LQR control algorithm to optimize the optimal output of BP neural network, so that the output data is closer to the target PID gain; finally, the control output value of the controller is input to the brushless DC In the motor, the speed control of the motor is achieved. At the same time, LNPID is used to continuously monitor the changes of parameters and the real-time feedback of parameters, so that the control effect can be idealized.

An electron beam fuse transition state maintenance system and maintenance method, the invention belongs to the additive manufacturing forming process monitoring device and method, which solves the problems existing in the existing light, sound and thermal signal monitoring methods; the electron beam fuse Transition state maintenance system, including mechanical vibration monitoring device, distance measuring device, numerical simulation device and DC motor speed regulating device. The maintaining method of the present invention includes a judgment step, a simulation step, and an adjustment step. The invention integrates real-time physical monitoring and numerical simulation data, and can adjust the wire feeding speed of the additive manufacturing equipment according to the droplet transition state in the electron beam fuse additive manufacturing process, so as to meet the requirements of the electron beam fuse additive manufacturing process. In the process, the additive manufacturing process is monitored and adjusted in real time to keep the fuse in a good liquid bridge transition state.

The invention discloses a verification system of a small magnetoelectric speed sensor for an aero-engine, which comprises a DC motor standard speed control output system and a verification fixture, wherein: the DC motor standard speed control output system includes a single-chip microcomputer and a small keyboard connected with the single-chip microcomputer , display output A, display output B, D / A output control, A / D feedback control, D / A output control and A / D feedback control are all connected to the DC motor, A / D feedback control and DC motor are also connected There is a measuring sensor, and the output shaft of the DC motor is connected with the fixed threaded connection seat on the verification fixture. The system utilizes mature single-chip computer control technology and adopts closed-loop control to realize the verification and calibration of small magnetoelectric speed sensors, ensuring the accuracy and reliability of aero-engine speed measurement.

The invention relates to an energy-controlled DC motor speed regulating device. The speed regulating circuit is composed of a DC motor, a working power supply, a controllable switch, a diode and an excitation power supply. The working power supply is connected to the armature winding of the DC motor through a controllable switch; the diode Connected in parallel at both ends of the armature winding of the DC motor; the excitation power supply is connected to the excitation winding of the DC motor; the control circuit includes a voltage detection circuit, a current detection circuit, an input energy calculation circuit, an inductance energy storage calculation circuit, an electromagnetic torque calculation circuit, and a load Torque calculation circuit, torque coefficient calculation circuit, expected current calculation circuit, energy storage difference calculation circuit, kinetic energy calculation circuit, load energy calculation circuit, output energy calculation circuit, energy comparison circuit, clock circuit, logic drive circuit, speed detection circuit. The invention reduces the volume, weight and cost of the main circuit, improves the operation reliability, and avoids the adverse influence of the defect of the PID controller itself on the performance of the speed regulating device.

The invention relates to a multi-objective optimization method for a double-closed-loop speed regulation system of a brushless DC motor. The multi-objective optimization for the double-closed-loop speed regulation system of a brushless DC motor is realized based on a quantum genetic algorithm, which can effectively solve the time-consuming and labor-intensive manual setting and large errors. And other problems, and overcome the difficulties of the previous algorithm "premature" and poor local convergence ability; in addition, the design of multi-objective fitness function can effectively prevent the damage of components caused by excessive control amount, which is conducive to obtaining a good speed control system.

The invention provides a direct-current motor speed control system and method based on surface electromyogram signals. The system comprises an electrocardio-electrode, a pre-amplifier, a band-pass filter, a post-amplifier and a single-chip microcomputer, wherein the electrocardio-electrode is arranged on the upper epidermis of human muscle, the output end of the electrocardio-electrode is connected with the input end of the pre-amplifier, the output end of the pre-amplifier is connected with the input end of the band-pass filter, the output end of the band-pass filter is connected with the input end of the post-amplifier, the output end of the post-amplifier is connected with the single-chip microcomputer, and the output end of the single-chip microcomputer is connected with a driving circuit of a direct-current motor. The system not only can acquire and amplify voltage signals generated when human muscle contracts, but also can control the speed of the direct-current motor by outputting the frequency band energy of the signals in real time so as to convert muscle contraction force into device movement driving force. The system has the advantages of being low in cost, simple in structure and convenient to use.

The invention discloses a virtual DC motor control method applied to a bidirectional DC / DC converter, specifically: in order to study the dynamic characteristics of the DC bus voltage, compared with the DC motor speed regulation process, the DC / DC converter resistance inductance is designed Characteristic droop coefficient; In order to introduce inertial and damping characteristics in DC microgrid, a virtual machine control model of bidirectional DC / DC converter is established. The method of the invention improves the traditional P-U droop control, and aims to study the dynamic characteristics of the DC bus voltage and introduce damping and inertia characteristics into the system to maintain the stability of the DC bus voltage. It has been verified by simulation that the control strategy used in the present invention is at the moment of load power fluctuation or light intensity change u dc The magnitude of change is smaller, and it can also quickly reach a new steady state.

The invention relates to an air-conditioning technology and provides a direct-current brushless motor system of an air conditioner and a rotating speed control method of the direct-current brushless motor system, solving the problems of low efficiency and high heat productivity of the traditional air conditioner resulted from adoption of a tap motor or PG motor. The technical scheme of the invention is as follows: the direct-current brushless motor system of the air conditioner is characterized by comprising an air conditioner indoor unit body and a direct-current brushless motor, wherein a motor shell of the direct-current brushless motor is integratedly provided with a motor microprocessor and control software; and the air conditioner indoor unit body comprises an indoor unit microprocessor and a direct-current brushless motor driving circuit, wherein the indoor unit microprocessor is connected with the direct-current brushless motor driving circuit, and the direct-current brushless motor driving circuit is connected with the direct-current brushless motor. The direct-current brushless motor system of the air conditioner and the rotating speed control method of the direct-current brushless motor system, disclosed by the invention, have the beneficial effects of achieving requirements on high efficiency, low electricity consumption, small size, high power density, large torque, high dynamic response speed of a transmission system, low noise and the like and being suitable for household air conditioners.

The utility model relates to an equilinear speed turning processing device for processing large-screen templates, which belongs to the field of mechanical engineering. It mainly includes: DC speed regulating motor, turntable transmission mechanism, knife row y-direction indexing mechanism, knife row z-direction advance and retreat mechanism, the connection method is: the output of the motor is connected to the input of the turntable transmission mechanism, the base of the turntable transmission mechanism and the The foundation is consolidated, the large carriage in the y-direction indexing mechanism of the knife row is arranged on the beam, and the z-direction advance and retreat mechanism of the knife row is arranged on the large carriage. Adopting the machine tool with the structure of the present invention, the rotating speed of the machine tool turntable is controlled by the computer to drive the turntable to carry out stepless speed change, and the horizontal division Δy of the knife row is measured and displayed by the grating and communicated to the computer control system for controlling the rotating speed of the DC motor , so as to moderately control the rotating speed of the turntable, ensure the cutting amount of the turning tool is consistent, and avoid the occurrence of chatter and tool breakage.

The invention provides a DC motor speed regulation simulation and experiment integrated apparatus and a method. The apparatus includes a host computer unit, a control unit and a DC motor unit. Bidirectional communication between the host computer unit and the control unit are achieved through a USB communication module. The DC motor transmits a value of a real-time rotating speed to the control unit, and the control unit can control the rotating speed of the DC motor unit according to a calculated control value, wherein the control value is calculated according to a deviation value of a set value of the rotating speed of the DC motor and the value of the real-time rotating speed of the DC motor. By adopting the USB communication technology, the DC motor speed regulation simulation and experiment integrated apparatus can continuously transmit data acquired at a high speed to a host computer in real time, real-time communication between sampled data and the host computer can be continuously achieved with no loss at the sampling rate of 6 M / s. According to the method provided by the invention, after requirements of a simulation result are met through DC motor speed regulation system modeling and simulation research on a control algorithm, the control algorithm is directly transmitted to a controller to be carried out an experiment in the DC motor speed regulation simulation and experiment integrated apparatus, to greatly facilitate research on the control algorithm.

The invention discloses a parallel type rotary speed controller of a nine-phase brushless direct-current motor for a water pump. The parallel type rotary speed controller comprises a first adder, a fuzzy PID (Proportion Integration Differentiation) rotary speed control module, a fractional order PID rotary speed control module, an absolute value module and a selection switch, wherein the absolute value module is used for generating different indication signals according to loading states of the nine-phase brushless direct-current motor for the water pump; the selection switch is used for controlling an output end of the fuzzy PID rotary speed control module to serve as an output end of the parallel type rotary speed controller when the indication signal represents that the loading state is on-load, and controlling the output end of the fractional order PID rotary speed control module to serve as the output end of the parallel type rotary speed controller when the indication signal represents that the loading state is no-load. A rotary speed can be controlled through selecting a proper controlling manner according to load requirements, an inhibition effect on torque ripples is improved, and an optimization effect of increasing / decreasing the rotary speed is improved. The invention further discloses a nine-phase brushless direct-current motor speed regulation system for the water pump; the nine-phase brushless direct-current motor speed regulation system comprises the parallel type rotary speed controller above and also has the effects above.

The present invention claims a method for controlling the speed regulation system of the permanent magnet brushless DC motor based on time-varying interference suppression. model; secondly, a disturbance observer is designed using the velocity signal in the model to estimate the time-varying disturbance in the system; finally, the final time-varying disturbance suppression controller is designed based on the disturbance estimation. Compared with the traditional cascade structure control method, this method is not only simple in controller design, but also easy to adjust parameters, and has strong interference suppression ability, which can meet the application requirements of permanent magnet brushless DC motor speed control system in high performance field .

The invention discloses a speed control device of a DC motor and a method thereof. The speed control device comprises a speed determination unit. The speed determination unit is connected with a controller; a speed instruction signal is input to the controller; and a power supplying unit which is connected in series between the speed determination unit and the controller. The operation method of the device is as follows: firstly, a rotating speed of the DC motor is confirmed through the speed confirmation unit, a speed feedback signal of the DC motor is input to the controller, the speed instruction signal is compared with the speed feedback signal by the controller so as to generate a speed error signal, the speed error signal is operated and compared by the controller so as to generate a speed control signal of the DC motor, and the power supplying unit supplies power to the DC motor to enable the DC motor to operate at a rotating speed required by the speed instruction signal. The invention can realize the loop closing control of the speed feedback, without the need of installing a speed feedback sensor, thereby saving installation space and installation techniques steps, and improving static performance and dynamic property of the speed control of the DC motor.

The invention discloses a brushed DC motor reinforcement learning self-adaptive control method, which belongs to the technical field of motors. The purpose of the present invention is to solve the problem of dead zone and crawling in the speed control process of brushed DC motors through online identification of cogging torque, nonlinear friction model parameters and unknown disturbance estimation and compensation strategy based on reinforcement learning through the parameter robust adaptive law. Non-linear control method of brushed DC motor speed and low speed instability problem. The steps of the invention are: establishing a mathematical model of the brushed DC motor; and a robust self-adaptive control method for the brushed DC motor. The present invention designs a feedforward plus feedback two-degree-of-freedom control structure based on differential flatness. Compared with the traditional double-loop PI control method, the feedforward control introduced by this method can act on the controlled object at the instant of reference input rather than after a deviation occurs, and a nonlinear compensation signal is introduced in the feedforward, which can suppress the impact of disturbance on the motor. The effect of low speed control improves the speed tracking accuracy.

The invention discloses an underwater diving propulsion device, that is, the installation bracket of the device is arranged at the tail end of the casing, the guide cover is connected with the installation bracket and is located outside the casing, the battery pack is arranged in the casing, and the DC motor is arranged on the installation bracket And located in the casing, the battery pack provides DC motor power, the DC motor shaft extends out of the mounting bracket and connects to the magnetic rotor, the isolation plate is vertically sealed on the inner wall of the shroud and separated from the end face of the magnetic rotor, the rear bracket is located on the isolation plate and is located on the guide In the flow cover, the two ends of the output shaft are respectively connected to the copper rotor and the propeller. The output shaft is installed on the rear bracket through the bearing. The end face of the copper rotor is spaced from the isolation plate and corresponds to the end face of the magnetic rotor. The control handle extends into the housing and controls the speed of the DC motor. , The detection instrument is located at the end of the joystick. The propulsion device overcomes the defects of the traditional propulsion device, has good sealing performance of the rotating shaft, improves the safety and reliability of the propulsion device, reduces energy consumption, and increases the diving depth.

The invention relates to a chopper technology-based speed regulating circuit for a brushless DC motor. The chopper technology-based speed regulating circuit for the brushless DC motor comprises an input filter, a single-phase chopper circuit, a chopper filter circuit, a single-phase rectifier circuit, a buffer and discharge circuit, a three-phase inverter bridge, a DSP controller, an isolation signal conditioning circuit and a drive circuit. The DSP controller is adopted as a main control chip, so that a complicated software algorithm is not needed; voltage of the brushless DC motor is modulated by adopting the single-phase chopper circuit, so that over-high inductance is not needed and the torque ripple of the motor is reduced; voltage reduction is carried out by adopting two stages of circuits of an AC chopper and the three-phase inverter bridge in the starting process, so that the starting current of the motor is reduced and the starting reliability of the motor is improved; and a protection signal can be output to protect a control circuit and the motor when an exception occurs.

An ABS control system based on an automobile brake test bench, with a single-chip microcomputer as the core, is composed of a CAN communication module, a DC motor speed control module and a hydraulic solenoid valve drive module. The system uses a single-chip microcomputer to control the on-off of the solenoid valve of the ABS actuator, and uses CAN bus for real-time communication, so that the upper computer can display the current working status of the braking system in time. State, send instructions to the single chip microcomputer, so as to realize further control of the braking process. The PWM pulse width modulation method is used to control the speed of the DC motor, and then control the pressure in the electric pump and brake pipeline.

The invention discloses a direct current motor speed control method, comprising the following steps: building a model of a direct current motor, and obtaining a first state equation of an input voltage and angular velocity of the direct current motor according to the model; building an adaptive sliding mode surface, and according to the first state equation, determining correspondence between a first-order derivative of a sliding mode surface of adaptive sliding mode control and a switching function; and according to the correspondence, determining a controlled quantity of the direct current motor. In the method disclosed by the invention, the adaptive sliding mode control is adopted for controlling speed of the direct current motor, and as the sliding mode surface is variable, in a control process, adaptive slope adjustment is performed, thus a track enters a final sliding mode switching area at the highest speed, and overshoot and chattering are obviously reduced. The invention alsodiscloses a direct current motor speed control system, having the same beneficial effects with the direct current motor speed control method.

The invention provides a direct-current motor rotation speed control circuit based on bridge type servo control. The circuit comprises a plurality of resistors, a variable resistor, a triode, a comparison amplifier and a direct-current voltage source. A bridge type servo control system consisting of a bridge type circuit is used in the circuit; when motor rotation speed is set, set voltage is used for simulatively indicating set rotation speed value; and if the set voltage value is not changed, the rotation speed N is stable and is not changed, so that the aim of stabilizing the rotation speed of a motor is fulfilled. The rotation speed N of the motor is changed by changing the set voltage, so that the aim of adjusting the rotation speed of the motor is fulfilled. The control on the stability of the rotation speed of the motor is realized, the requirement of small volume of a device is met, the influence of temperature to the stability of the circuit is effectively reduced, and the stability of the whole device is improved to the greatest degree.