5results about How to "Improved speed stability" patented technology

The utility model discloses a raw cotton impurity analyzer with an antistatic roller shaft, which belongs to the technical field of textile machinery, and comprises a rack, a surface table at a feeding end and a carding roller, the roller shaft is arranged at the upper end of the surface table, the roller shaft is made of an integrated antistatic nylon material, transverse flutes are arranged on the surface of the roller shaft, and the surface resistivity is 10-10 omega.cm; positioning assemblies are installed on the two sides of the rack, each positioning assembly comprises a hydraulic air cylinder, a positioning clamping jaw and a pressure sensor, the telescopic end of each hydraulic air cylinder abuts against the end of the corresponding roller shaft through the corresponding positioning clamping jaw so that the roller shaft can be attached to the cambered surface of the corresponding surface table, and the pressure sensors monitor pressure values in real time and feed the pressure values back to the control system; by means of the integrated antistatic nylon roller shaft, the precise positioning mechanism driven by the hydraulic air cylinder and the bevel gear transmission assembly, electrostatic interference is effectively eliminated, millimeter-level dynamic positioning is achieved, friction loss is reduced, and raw cotton impurity detection precision and equipment operation stability are remarkably improved.

This utility model discloses a swing arm control device for a winding machine, comprising: a swing arm signal processing unit for receiving voltage signals from sensors located at the swing arm and feeding these signals back to a main control CPU processor; a main control CPU processor for determining whether the swing arm is in a normal operating position based on the feedback signal; if it deviates from the normal operating position, the main control CPU processor sends a control signal to a power transistor pre-drive output unit; a power transistor pre-drive output unit for amplifying and converting the low-level control signal into a drive signal for operation; and a brushless motor power transistor drive unit for adjusting the motor speed of the winding machine by changing the conduction time of the power transistor after receiving the drive signal, thereby returning the swing arm to the normal operating position. This utility model achieves stable speed operation of the winding machine and reduces the yarn scrap rate.

The invention relates to the technical field of vehicle permanent magnet synchronous motor control, and particularly discloses a permanent magnet synchronous motor rotor position estimation method based on a rotating speed feed-forward phase-locked loop. Comprising the following steps: calculating a flux linkage under a k-moment two-phase static coordinate system according to a k-moment three-phase duty ratio, a k-moment bus voltage, a k-moment two-phase static coordinate system current, an effective flux linkage and q-axis inductance; calculating the electric angular velocity of the arc tangent rotor after filtering at the moment k according to the flux linkage under the two-phase static coordinate system at the moment k; and obtaining a k-1 moment rotor electrical angle of the permanent magnet synchronous motor, and calculating the k moment rotor electrical angle of the permanent magnet synchronous motor according to the flux linkage under the k moment two-phase static coordinate system, the k-1 moment rotor electrical angle and the filtered arc tangent rotor electrical angular velocity at the k moment. According to the permanent magnet synchronous motor rotor position estimation method based on the rotating speed feed-forward phase-locked loop, the estimation precision and the dynamic response capability of the rotor position can be improved when the rotating speed and the load of the motor suddenly change.

This invention provides a hydraulic excavator energy-saving control method, system, and excavator. The excavator energy-saving control method includes the following steps: acquiring the excavator's motion and pressure information; matching the motion and pressure information with a pre-stored motion spectrum to obtain a pre-stored engine pre-loading curve corresponding to the motion spectrum; and adjusting the engine output power in real time according to the engine pre-loading curve. This invention acquires the excavator's motion spectrum based on the motion and pressure information collected by the controller, forms the engine's pre-loading curve, and adjusts the engine's output power in real time according to the motion spectrum, making the engine-pump power matching more precise and reasonable, reducing engine power fluctuations, and lowering fuel consumption.

The utility model provides a high-precision hobbing workpiece main shaft structure, which relates to the technical field of machine tool precision main shaft manufacturing and comprises a shaft core, a front bearing assembly, a torque motor, a rear bearing assembly and a circular grating encoder. The front bearing assembly is composed of a front end cover, a front angular contact ball bearing, a front bearing seat and a front locking nut and arranged at the front end of the shaft core in a sleeving mode. The rear bearing assembly consists of a rear bearing seat, a rear angular contact ball bearing, a rear locking nut and an encoder mounting cover, and is sleeved at the rear end of the shaft core; the torque motor is composed of a torque motor stator and a torque motor rotor. The torque motor is arranged in the middle of the shaft core in a sleeving mode. According to the scheme, a coupler is omitted, a built-in motor direct drive scheme is adopted, and the transmission precision and the response speed are improved; according to the scheme, the torque permanent magnet motor is adopted for driving, the circular grating absolute value encoder is used for replacing a traditional servo motor and gear encoder scheme, the positioning precision of the main shaft is higher, the speed stability is higher, and the speed synchronism is also higher.