4results about How to "High speed control precision" patented technology

The present disclosure relates to a diesel engine speed cascade auto-disturbance rejection control system, a diesel engine and a locomotive. The system comprises: a feedforward controller, an inner-loop auto-disturbance rejection controller and an outer-loop auto-disturbance rejection controller connected in sequence; wherein the inner-loop auto-disturbance rejection controller specifically comprises: a nonlinear error feedback controller and an extended state observer; the extended state observer is used to observe model deviations and external disturbances, and to provide real-time feedback compensation for the control quantity according to the observed value of the total disturbance; the nonlinear error feedback controller is used to track the signal transmitted from the outer loop; wherein the outer loop controller comprises: an error feedback controller and an extended state observer for tracking the target speed.

The invention discloses a turning gear with a gear variable-frequency meshing function, belongs to the field of steam turbines, and aims to solve the problem of tooth beating in the meshing process of a turning system. The system comprises a reduction gear box, a meshing pinion, a turning motor, a PLC controller, a frequency converter, a rotating speed sensor and an encoder. The turning motor is arranged on the upper portion of the reduction gear box and connected with an input shaft of the reduction gear box, and an output shaft of the reduction gear box drives the meshing pinion to rotate. The encoder is used for monitoring a rotating speed signal of the turning motor and feeding back the rotating speed signal to the frequency converter in real time to form closed-loop control so as to control the gear meshing rotating speed; the rotating speed sensor is used for monitoring a rotating speed signal of a large gear of the steam turbine and feeding back the rotating speed signal to the PLC, and the PLC changes the running speed of the barring motor through the frequency converter so that the barring motor can output the steam turbine barring rotating speed; and then the meshing pinion is driven to axially move to be meshed with the turbine bull gear, and turbine turning is achieved.

The present invention provides a fuzzy compensation control method and system based on electric propulsion, which relates to the field of digital processing technology. The method includes: building a propulsion system simulation model based on the Simulink visual simulation tool; obtaining the real-time water immersion depth and propeller speed of the propeller, using the experimental spectrum interpolation method to obtain the torque loss coefficient, and determining the target torque and target speed according to the propeller speed requirements of the air entrainment effect, using the Mamdani fuzzy reasoning method to calculate the fuzzy output, obtaining the torque compensation value of the propulsion motor, importing it into the propulsion system simulation model for simulation verification, and determining the control strategy. The technical problem of low speed control accuracy of the electric propulsion system and difficulty in ensuring stable operation of the propeller is solved, and a fuzzy compensation control strategy with torque loss compensation is achieved to improve the speed control accuracy, thereby achieving the technical effect of improving the compensation control accuracy while ensuring the stable operation of the propeller.

The utility model relates to a kind of rotary platform devices for substance detection, comprising: input module, motor driver module, main power module, voltage reduction module and raspberry module, main power module is powered for motor driver module and raspberry module by voltage reduction module, input module connects the ADC pin of raspberry module, motor driver module is connected with the stepping motor of rotary platform, motor driver module and raspberry module are connected, and motor driver module is used to receive the PWM signal output by raspberry module to realize the speed regulation of the stepping motor of rotary platform.The utility model described for substance detection rotary platform device, speed control precision improves, 16-bit ADC is collected knob signal and A4988 subdivision drive, and speed regulation precision is improved from ±10% to ±0.5%, meet the requirement of precision positioning and uniform rotation;Support real-time stepless adjustment, and on-site debugging time is shortened;Power compatibility is enhanced.