32results about How to "Eliminate the effects of controls" patented technology

The invention discloses an LOE (loss of excitation) fault tolerance prediction control method and device for a permanent magnet synchronous motor, and the method comprises the steps: obtaining the rotating speed, voltage and current of the permanent magnet synchronous motor, designing an LOE torque detection sliding-mode observer, obtaining an LOE disturbance estimation value and the observation value of the rotating speed, carrying out the fault tolerance prediction and rotating speed control to calculate a q-axis instruction current, designing an LOE flux linkage detection sliding-mode observer, obtaining a current observation value and a state current observation value after the LOE of a permanent magnet, carrying out the fault tolerance prediction and rotating speed control to calculate an instruction voltage, carrying out the inverse Park transformation and modulation through an SVPWM module, and generating a PWM pulse signal. The device comprises program units corresponding to the steps. The method achieves the quick and no-static-error tracking of the rotating speed and current of the permanent magnet synchronous motor under the LOE condition of the permanent magnet, optimizes the control performances of a rotating speed ring and a current ring, and facilitates the application of the permanent magnet synchronous motor in a severe environment and occasions with higher requirements for reliability.

The invention relates to stainless steel coiling welding leader tape method. It includes the following steps: material annealing acid cleaning line tail welding tape steel head leader tape, digging edge for the welding seam; material annealing acid cleaning line coiler coiling; steam transferring steel coil; unfolding the steel coil outer ring and straightening; welding the outer ring leader tape and digging edge for the welding steam; unreeling the steel coil; coil stripping. The invention can be used in stainless steel leader tape or other steel leader tape, has little device investment, high correlate device utilization factor, and only needs part of unreeling to realize stainless steel coil two ends welding.

The invention discloses an automatic aperture control device and an automatic aperture control method of a full HD (High-Definition) camera. The automatic aperture control device comprises a CMOS (Complementary Metal Oxide Semiconductor) sensor, an operation module and auxiliary equipment which are connected in sequence. The operation module comprises a frame brightness calculated value calculation module, an actual brightness value calculation module and a brightness difference calculation module, and is used for removing the brightness gain from the brightness calculated value of the frame and calculating the actual brightness value of the frame for aperture control. With the device and the method, the influence of the exposure and the gain value in the CMOS sensor on the aperture control is eliminated, the aperture control is accurate, the implementation method is simple and the cost is reduced.

The invention discloses a cascade connection robust fault-tolerance forecast control method for a permanent magnet synchronous motor. The method comprises the following steps that the rotating speed,voltage and electric current of the permanent magnet synchronous motor are obtained; a fault detection integral terminal sliding mode observer is designed to obtain the observation value of fault items; a robust fault-tolerant forecast rotating speed controller is designed, and q-axis instruction current is calculated based on the given rotating speed, the response rotating speed and fault item observation value; a robust fault-tolerant forecast current controller is designed, and command voltage is calculated based on given current, response current and the fault item observation value; and PWM pulse signals are generated by inverse Park transformation and SVPWM module modulation, and therefore the permanent magnet synchronous motor is driven to work. Fast robust tracking with no static error of the rotating speed and electric current of the permanent magnet synchronous motor is achieved, and control accuracy and operation reliability of the permanent magnet synchronous motor are improved. Development of application of the permanent magnet synchronous motor in harsh environment and high reliability requirements is facilitated.

The invention provides a three-phase rectification control method based on an improved adaptive fuzzy neural network, and relates to the technical field of power electronics. According to the invention, the defects of the traditional fuzzy neural network are improved; a mode of combining a type I function and a type II function is adopted; parameters are updated using an elliptical membership function through a gradient descent method; the output of the antecedent parameters with respect to the function is non-linear, and since there is a normalization layer in the structure of the fuzzy neural network, the parameter of the antecedent of each membership function exists at least in the denominator of the output of the normalization layer regardless of whether the parameter participates in the rule. Sliding mode control enables the whole system to be more stable, and can be ensure that the fuzzy neural network converges faster in the online adjustment process; and the PD controller and the improved self-adaptive fuzzy neural network controller are combined to achieve better control over three-phase rectification compared with a traditional PID controller.

The invention provides a feedforward decoupling vector control method for the operation of a frequency converter with an output reactor. The feedforward decoupling vector control method comprises the steps of inputting the inductance and resistance parameters of a three-phase AC reactor allocated for the frequency converter into the controller of the frequency converter before the operation of the frequency converter, when the frequency converter starts to operate and the controller performs vector control, calculating, by the controller, the deviation between a motor input end voltage vector generated by the three-phase AC reactor and the expected output vector of the frequency converter according to the off-line input parameters of the three-phase AC reactor in combination with the three-phase output current of the frequency converter detected by the internal current sensor of the frequency converter and a motor rotating speed obtained by a motor speed measuring device. And then performing feedforward compensation on the deviation in the output voltage reference waveform of the controller. The feedforward decoupling vector control method has the beneficial effects that the stator voltage vector obtained by the input end of the motor is completely consistent with the expected output voltage vector of the frequency converter by virtue of the feedforward compensation and the influence of the inductance of the reactor on actual voltage vector control is eliminated.

The invention discloses a control method of a high-accuracy adjustable servo motor. The control method comprises the steps of 1, dividing a plurality of rotational speed zones and temperature zones; 2, recording a curve graph of a current deviation value, changing with a rotor position, of the servo motor under each rotational speed zone and each temperature zone; 3, performing parameter self-setting of the servo motor; 4, providing a rechargeable battery pack, and arranging a capacitor between a positive electrode and a negative electrode at an output end of the battery pack; 5, respectivelyarranging three inversion circuits at two ends of the capacitor, wherein the difference among voltage phase sequences of output second ends of the three inversion circuits is 120 degrees; and 6, connecting a power input end of the servo motor to a three-phase AC power supply, acquiring a phase voltage and a phase current of three phase inputs of the servo motor in real time, and switching the output second ends of the three inversion circuits as an input power supply of the servo motor when the phase voltage of an arbitrary phase input exceeds a set voltage range. By the control method, the technical problem that the control accuracy of the servo motor cannot be further improved is solved.

The invention discloses a CT (Computed Tomography) bed motion control method based on time sequence track points. The method comprises steps of receiving the first section of track point data; receiving a starting motion instruction and controlling a motor to enter the motion state and execute the first section of track point data; feeding state word data with motor starting time information back; receiving the second section of track point data based on the state word data; receiving track running data; and controlling the motor to carry out corresponding track motion. According to the method, the influences of network delay on motor running precision are eliminated and the control precision is improved. The invention also discloses a CT (Computed Tomography) bed motion control system based on time sequence track points.

The invention discloses a driving control system used for a servo motor. The input end of a servo driving circuit is connected with the output end of a controller of the servo motor; the output end ofthe servo driving circuit is connected with the signal input end of a servo driver; the power supply input end of the servo driver is connected with a three-phase alternating current power supply; the power supply output end of the servo driving circuit is connected with the power supply input end of the servo motor; the power supply input ends of three inversion circuits are connected with the two ends of a capacitor, and the power supply output ends of the inversion circuits are connected with the power supply input end of the servo motor; the input end of the inversion driving circuit is connected with the output end of the controller, and the output end of the inversion driving circuit is connected with the control ends of the inversion circuits; a stand driving signal generator is connected with the input end of the controller; and a comparison module is connected with the controller, wherein the three-phase alternating current power supply or the inversion circuits can be connected with the power supply input end of the servo motor according to the comparison result of the comparison module. By virtue of the driving control system, the technical problem of incapability of accurate control on the servo motor can be solved.

The embodiment of the invention provides a current bias adjusting method and device of a direct-drive permanent magnet electric locomotive converter, and the method comprises the steps of sampling analternating current inputted into a four-quadrant rectifier, and obtaining an alternating current in a sampling period, wherein the alternating current comprises a positive half-period current value and a negative half-period current value; obtaining a first sum value of the current values of the positive half cycle and a second sum value of the current values of the negative half cycle, and obtaining a current bias value according to the first sum value and the second sum value; inputting a first difference value between the current bias value and zero into a first PI controller to obtain a first output value outputted by the first PI controller; obtaining a pulse width modulation symbol according to the first output value and a second output value outputted by the PR controller; and controlling the on-off of an IGBT in the four-quadrant rectifier according to the pulse width modulation symbol. According to the method provided by the embodiment of the invention, the current bias at the transformer side can be fundamentally suppressed and eliminated, so that the influence of the current bias on the control of the four-quadrant converter is eliminated.