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

The invention provides a method for improving speed control precision by optimizing an FOC algorithm, and relates to the technical field of motor control, and the method comprises the following steps: S1, obtaining a speed PI controller and a magnetic flux PI controller in the FOC algorithm; s2, the speed ring PI controller calculates and outputs Uq through the target speed given value and the angular speed; s3, the flux PI controller calculates and outputs Ud through the flux weakening given value and the feedback value; and S4, after the Uq and the Ud are subjected to PARK inverse transformation, the Uq and the Ud are input to CLARK inverse transformation or SVPWM, a control signal is modulated and output through a microcontroller, and a three-phase motor is driven to operate. According to the method, on the basis of a traditional FOC algorithm, calculation of a current loop Iq is removed, and Uq is directly calculated and output through a speed loop PI, so that the influence of current sampling interference on speed control precision can be effectively avoided, the calculation time of the current loop is effectively shortened, the system control delay is reduced, and the motor operation stability is improved.

The utility model relates to the technical field of hollow fiber production, and discloses a drafting mechanism for hollow fiber production, which comprises a rack, a drafting mechanism is arranged on one side of the top end of the rack, a guide mechanism is arranged on the other side of the top end of the rack, and the rack comprises two bases which are symmetrically arranged front and back. The drafting mechanism comprises a set of sliding frames fixedly connected with one side of the top end of the base, and the two sliding frames are symmetrically arranged. The high-precision motor and the driver are adopted, an advanced speed control system is matched, the driving motor is a servo motor, a high-precision speed monitoring and control mechanism is configured, the speed of the roller can be monitored in real time and subjected to feedback adjustment, the speed control precision can be improved, automatic adjustment and optimization of drafting parameters are achieved, and the production efficiency is improved. And stable performance of products in different batches is ensured.

The application discloses a real-time speed regulation method based on jerk constraint, comprising the following steps: obtaining a planning trajectory and current motion state information; determining a constraint condition of a time scaling function based on the planning trajectory, the current motion state information and preset speed, acceleration and jerk constraints; constructing a system state equation represented by the time scaling function and its derivative, and defining a deviation between a current state of the time scaling function and a target state of a reference time function based on the equation; solving a group of control parameters according to the deviation in the coordinates of a characteristic plane based on a geometric figure search strategy; and generating control input according to the control parameters to adjust the time scaling function in real time, so that the joint motion of the robot satisfies the jerk constraint, and online smooth speed regulation satisfying the jerk constraint is realized for any given reference trajectory.

The present invention relates to a switched reluctance drive system and control method. The switched reluctance drive system and control method of the present invention realize true closed-loop vector control based on the two physical quantities torque and speed output by the motor based on accurate current and rotor position detection, so that the current, torque and speed control precision is high. The current control precision is high, which effectively suppresses the generation of large current spikes and also reduces the motor noise; the torque control precision is high, which greatly reduces the torque pulsation, has little impact on the power module, and improves the reliability during operation; the speed control precision is high, which ensures the stability of the overall control performance; the efficiency is high and the heat is small under frequent startup and overload conditions, and the internal temperature and power regulation curve are matched, thereby optimizing the performance of the switched reluctance drive system. In view of the above reasons, the present invention can be widely used in the field of motor drive.