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

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 current-limiting automatic regulator for a motor, comprising a first sampling circuit; a first controller; a second controller; a second sampling circuit; a voltage dividing circuit; a boosting circuit; and a comparator; The first output terminal of the second controller is connected to the non-inverting terminal of a first voltage amplifier, the second output terminal of the second controller is connected to the non-inverting terminal of a second voltage amplifier, and the output terminal of the second voltage amplifier is connected to the first terminal of the inductor , the output end of the first voltage amplifier is connected to the first end of the first resistor. The invention adjusts the current limiting value of the motor in real time according to the motor speed and DC voltage, thereby improving the reliability of the motor operation.

The feed-forward decoupling vector control method for the operation of the inverter with an output reactor includes the following steps: before the inverter runs, input the inductance and resistance parameters of the three-phase AC reactor configured by the inverter into the controller of the inverter ; When the inverter starts to run and the controller performs vector control, the controller will cooperate with the three-phase output current of the inverter detected by the internal current sensor of the inverter and the motor speed obtained by the motor speed measuring device according to the parameters of the three-phase AC reactor input offline. , to calculate the deviation between the voltage vector at the motor input terminal generated by the three-phase AC reactor and the expected output vector of the frequency converter; and then perform feed-forward compensation for this deviation in the output voltage reference waveform of the controller. The beneficial effects of the present invention: through the feed-forward compensation, the stator voltage vector obtained at the input end of the motor is completely consistent with the expected output voltage vector of the frequency converter, and the influence of the reactor inductance on the actual voltage vector control is eliminated.

The invention discloses a cascade robust fault-tolerant predictive control method of a permanent magnet synchronous motor. The implementation steps of the method include obtaining the rotational speed, voltage and current of the permanent magnet synchronous motor, and designing a fault detection integral terminal sliding mode observer to obtain observation of fault items. value; design a robust fault-tolerant predictive speed controller, calculate the q-axis command current according to the given speed, response speed, and fault item observations; design a robust fault-tolerant predictive current controller, according to the given current, response current, and fault item observations Value to calculate the command voltage, through inverse Park transformation, SVPWM module modulation to generate PWM pulse signal, so as to drive the permanent magnet synchronous motor to work. The invention realizes fast, robust and no static error tracking of the rotational speed and current of the permanent magnet synchronous motor, and improves the control accuracy and operation reliability of the permanent magnet synchronous motor. The invention is beneficial to expand the application of the permanent magnet synchronous motor in occasions with harsh environments and high reliability requirements.

The invention discloses a motion control method of a CT bed based on time-series track points, which includes: receiving the first segment of track point data; receiving a starting motion command, controlling the motor to enter a motion state and executing the first segment of track point data; feedback with the motor Start the status word data of the time information; receive the second segment of track point data based on the status word data; receive the track operation data; after executing the first segment of track point data and the second segment of track point data in sequence, execute the track operation data to control the motor Carry out the corresponding trajectory movement. The invention eliminates the influence of the network delay on the running precision of the motor, and improves the control precision. The invention also discloses a motion control system of the CT bed based on time series trajectory points.