Inertial load starting method and system

Abstract

The invention relates to an inertial load starting method and system. The method comprises that a running current of a motor is obtained, and a torque current of the motor is calculated according to the running current of the motor; whether the torque current of the motor is greater than a preset torque limit value is determined; if YES, a power off instruction is executed, and current and torque output to the motor is stopped; the motor continues to rotate in the present rotation direction on the basis of inertia; the rotation direction and speed of the motor are identified continuously, when the rotation direction of the motor is changed to a direction opposite to the present rotation direction, an output torque is applied to the motor according to the rotation speed so that the motor rotates in an accelerated way in the changed rotation direction; and the steps are repeated till the torque current is lower or equivalent to the torque limit value and the rotation frequency of the motor is greater than a preset frequency threshold, and then, the motor is controlled to rotate normally.

Description

technical field [0001] The invention relates to the field of frequency converter control, in particular to a method and system for starting an inertial load. Background technique [0002] There are many occasions for processing inertial loads in industrial sites, such as ball mills, tube mixers, etc. During the operation of the tube mixer, first start the equipment to rotate, when the equipment rotates to the specified frequency, then feed the material into the drum, the centrifugal force generated by the rotation of the drum makes the added material adhere to the drum, and finally form a finished product with a cylindrical structure . The operation process of the ball mill is to add the grinding body to the drum first, then rotate it first, and then add the material. When the ball mill cylinder rotates, the grinding body is attached to the cylinder liner due to inertia, centrifugal force and friction. It is taken away by the cylinder, and when it is brought to a certain h...

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to address the problem that the inverter cannot be started due to too much load inertia when the inverter control equipment is restarted after stopping, and to provide an inertia that enables the inverter to effectively start when the load inertia is too large. Load starting method and system

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