Rotating speed overshoot suppressing system of permanent magnet motor of hydraulic pump

Abstract

The invention discloses a rotating speed overshoot suppressing system of a permanent magnet motor of a hydraulic pump. The system involves a speed regulator, a current regulator, a hydraulic electricpump and the permanent magnet synchronous motor; the output end of the speed regulator is electrically connected with the current regulator and the permanent magnet synchronous motor; the output end of the permanent magnet synchronous motor is electrically connected with the hydraulic electric pump; the output end of the current regulator is electrically connected with a torque current feedback calculation circuit; and the output end of the torque current feedback calculation circuit is electrically connected with a controller. According to the system, a current loop can be subjected to feedforward control, meanwhile, the internal rotating speed command is processed by adopting a first-order inertia link, and in the starting process of the hydraulic electric pump, the overshoot of the rotating speed is inhibited, the influence of the over-rotating speed on the service life of the hydraulic electric pump is eliminated, the pressure stabilizing time is reduced, and the robustness of a control system is improved.

Description

technical field [0001] The invention relates to the technical field of a hydraulic electric pump speed overshoot control system, in particular to a hydraulic pump permanent magnet motor speed adjustment suppression system. Background technique [0002] The hydraulic electric pump assembly is generally composed of a drive motor controller and a plunger pump. In order to ensure the design life of the plunger pump, the plunger pump must run below the design speed; sudden change in load is a typical working condition of the plunger pump, and PID control is adopted. In the control software of the motor controller, the control loop needs to have sufficient control bandwidth to ensure the stability of the system. [0003] However, the response speed of the control loop and the speed overshoot are a pair of contradictions. During the start-up process and the load mutation process, an excessively high positive speed overshoot will cause the plunger pump to run at an over-speed, resul...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hydraulic pump permanent magnet motor speed adjustment suppression system to solve the problems that the pressure stabilization time becomes longer and the robustness of the hydraulic system decreases in the above-mentioned background technology

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