Constant power control method based on proportioning pump driven by medium voltage motor

Abstract

The invention relates to a constant power control method based on a proportioning pump driven by a medium voltage motor. The constant power control method includes the following steps: (1) self inspection of a hydraulic forging press is carried out; (2) the step (3) is executed if a diagnosis result of a control module is normal, and an alarm signal is given out and the step (1) is repeatedly executed if the diagnosis result of the control module is abnormal; (3) the medium voltage motor of the hydraulic forging press drives the proportioning pump to work, and the proportioning pump changes an opening of a valve core through an amplification plate according to process motion so that different flows can be output to guarantee the running speed and frequency of a sliding block; and (4) the hydraulic forging press enters a workpiece pressing motion stage, and the control module collects pressure information of the sliding block through a pressure sensor, so that the flow of the proportioning pump is controlled, and the pressure of the sliding block continuously rises and the speed of the sliding block is constant in the initial stage. When the power reaches a rated value of the medium voltage motor, the hydraulic forging press enters constant power closed-loop control, the pressure of the sliding block continuously rises, and the speed of the sliding block is decreased continuously, so that the rated power value of the medium voltage motor is guaranteed, and the workpiece pressing molding motion is completed.

Description

technical field [0001] The invention belongs to the technical field of medium-voltage motors, and in particular relates to a constant power control method based on a medium-voltage motor-driven proportional pump with high safety factor. Background technique [0002] With the rapid development of forging hydraulic press technology, the production of large forging hydraulic presses has a wide range of applications and market prospects. The traditional forging hydraulic press design uses a low-voltage motor, which has a large energy loss and a large starting current to impact the power grid. At the same time, the traditional forging hydraulic press is starting In the process, it generally does not have the function of self-inspection. In order to improve the safe working performance of forging hydraulic presses, most of them use manual self-inspection. However, it is found in practice that the process of manual self-inspection is cumbersome and the error rate is relatively high....

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of forging hydraulic press technology, the production of large forging hydraulic presses has a wide range of applications and market prospects. The traditional forging hydraulic press design uses a low-voltage motor, which has a large energy loss and a large starting current to impact the power grid. At the same time, the traditional forging hydraulic press is starting In the process, it generally does not have the function of self-inspection. In order to improve the safe working performance of forging hydraulic presses, most of them use manual self-inspection. However, it is found in practice that the process of manual self-inspection is cumbersome and the error rate is relatively high. Therefore, , it is relatively important to design and develop a constant power control method based on a medium-voltage motor-driven proportional pump that can overcome the above defects

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