3results about How to "Reduce phase delay" patented technology

The invention provides an improved sliding-mode observer for permanent magnet synchronous motor position sensorless control. A traditional sliding-mode observer can cause a jitter phenomenon of observation information in motor control. According to the method, the control equation of the sliding-mode observer is redesigned, the adaptive rate is combined, and a low-pass filter is replaced, so that the estimation precision of the back electromotive force is improved. A hyperbolic tangent function is used to replace a sign function to alleviate the jitter problem of the observer, and a phase-locked loop technology is used to replace an arc tangent function to reduce estimation errors and phase delay. The feasibility of the control system is verified by building a system simulation model based on a static coordinate system in MATLAB / Simulink. A simulation result shows that the control system reduces the rotor speed error and the rotor position error, so that the control performance and the stability of the permanent magnet synchronous motor are improved.

The application discloses a high-precision low-delay on-chip ripple compensation circuit and belongs to the technical field of integrated circuit design.The on-chip ripple compensation circuit comprises PMOS tubes P1-P9, NMOS tubes N1-N5, resistors R1-R6 and capacitors C1-C3.In the on-chip ripple compensation circuit, one end of the resistor R1 is connected to a node SW, the other end of the resistor R1 is connected to one end of the resistor R2 and R3, and the connection position is a node vs10;the other end of the resistor R2 is connected to the ground VSS, the other end of the resistor R3 is connected to one end of the capacitor C1 and the gate of the PMOS tube P9, and the connection position is a node vlpf;the other end of the capacitor C1 is connected to the ground VSS, the drain of the PMOS tube P9 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the ground VSS.The link path of the on-chip ripple compensation circuit has only four levels, and the phase delay is shortened;two-stage filtering is performed in the last stage, the alternating current is extracted in the output stage, flows into the resistor and is converted into voltage, all the MOS tubes can work in the saturation region, zero DC error is achieved, and the precision of the ripple compensation is improved.

Provided is an elastic core mold assembly driven by servo cylinders, which comprises a core mold fixing seat and an elastic core mold that are fixed and connected in a modular concentric manner; a plurality of micro servo cylinders are uniformly distributed and fixed on the lower conical surface I of the core mold fixing seat; the plurality of servo cylinders perform synchronous adjustment actions; and the servo cylinders perform the end abutting action on the lower conical surface II of the elastic core mold to deform the mouth edge of the elastic core mold to realize core mold reshaping. The utility model realizes the fast, high-precision, online dynamic reshaping adjustment of the elastic core mold without waves, has a compact structure, is economical and practical, and is suitable for promotion.