85results about How to "Meet the need for control" patented technology

The invention discloses a precision correction method and system for a magnetic levitation train traction system position control ring. The precision correction method comprises the steps that A, a speed measuring system collects position related information of a train; B, the position related information is sent to a traction system through a signal system; and C, the traction system carries outclosed-loop control over the position of the train according to the position related information. The method further comprises the step A1 before the step A. Time is checked for the speed measuring system, the signal system and the traction system, and timestamp information is increased. According to the method and the system, when the time is checked for the speed measuring system, the signal system and the traction system, the timestamp information is increased, the influence of delay and periodical random shaking is avoided, and the requirement for traction control of the medium and high speed magnetic levitation train is met. By the adoption of mature and cheap 4G-LTE wireless communication, the method has the characteristics of high bandwidth, low delay, wide coverage, QOS ensuring and high-speed moving. The method for improving the precision of medium and high speed magnetic levitation pole phase angles is simple and practical, and has a good project application prospect.

The invention discloses an adjusting method of cursor sensitivity. The method comprises the steps that a currently-shown operation interface of ultrasonic diagnosis equipment is obtained, then, a first sensitivity adjusting value corresponding to the currently-shown operation interface is determined according to the preset corresponding relations between operation interfaces and sensitivity adjusting values, and therefore the cursor sensitivity of the currently-shown operation interface is adjusted according to the first sensitivity adjusting value.

The invention provides a method for detecting the position of a rotor based on counter potentials of a permanent magnet motor, aiming at overcoming the defects that the traditional methods for detecting the position of the rotor are complex and depend on motor parameters. The method is characterized by after filtering alpha axis counter potential and beta axis counter potential in an alpha-beta coordinate system of the permanent magnet motor, calculating the position of the rotor after phase shifting, and obtaining the actual position of the rotor according to the influence of the predetermined filtering frequency and the predetermined number of filtering times on the phase of the rotor. The method has the following beneficial effects: various spurious signals in the counter potential calculation results can be effectively eliminated to remain the actual signals, thus the estimated position of the rotor is more accurate and stable; and the estimated position of the rotor dispenses with additional check or correction under the condition that the important motor parameters are obviously changed or the range of the motor parameters can be only roughly determined, thus greatly improving the robustness of an observer and being convenient for engineering application and implementation.