Online monitoring device for direct-axis and quadrature-axis inductance of permanent magnet synchronous motor for crane

Abstract

The invention provides an online monitoring device for a direct-axis and quadrature-axis inductance of a permanent magnet synchronous motor for a crane, which is an online monitoring device used for a large-scaled hoisting machinery applied to a port. By online acquisition and data processing on a real-time voltage value, a real-time current value, a real-time position angle and a real-time angular speed of the permanent magnet synchronous motor, intelligent online monitoring on a direct-axis and quadrature-axis inductance value of the permanent magnet synchronous motor in the operating process of the crane is implemented, a variation condition of the direct-axis and quadrature-axis inductance when the motor reaches magnetic saturation is known in real time, and an alarm is sent out to remind a manager that the crane is overloaded and magnetic saturation occurs and needs to be timely treated, so that online intelligent management capacity of an enterprise on the crane is improved. The online monitoring device is high in practicality, ensures real-time performance of direct-axis and quadrature-axis inductance monitoring and implements identification and alarming of the magnetic saturation of the permanent magnet synchronous motor for the crane.

Description

technical field [0001] The invention relates to an intelligent on-line monitoring device, in particular to an intelligent on-line monitoring device for the right-angle axis inductance of a permanent magnet synchronous motor under the low-speed and high-torque working condition of a crane. Background technique [0002] In traditional heavy industrial equipment such as cranes, the drive system of permanent magnet synchronous motors is widely used due to its advantages of simple structure, small size, high efficiency and power factor. It has the disadvantages of large moment of inertia, low efficiency, high noise, complicated processing and frequent maintenance. However, because the crane operates in the special working condition of low speed and high torque, the permanent magnet synchronous motor is prone to magnetic saturation, which affects the inductance of the right-angle axis, and then affects the electromagnetic torque, which brings inconvenience to the design and contro...

AI Technical Summary

Problems solved by technology

However, the cranes at the present stage cannot realize the online intelligent monitoring of the state information of the orthogonal axis inductance during the operation process, and cannot achieve the most efficient control, which leads to the design of the permanent magnet synchronous motor far higher than the actual requirements, resulting in a large number of Waste of resources, low economy, bring unnecessary losses to the enterprise

Images