Motor drive system for direct main drive of weaving machine

Abstract

The invention discloses a motor drive system for direct main drive of a weaving machine. The motor drive system comprises a switched reluctance motor, a power converter, a controller and a position detector, wherein the motor is a three-phase switched reluctance motor; the power converter is a four-level power converter; the position detector is an absolute-type encoder; the instantaneous current flowing through a power device and a motor winding is detected by adopting the current sensor; the controller regards the instantaneous current as the foundation for current chopping control and over-current protection; and the direct current side voltage is detected by adopting a voltage sensor for voltage protection. The motor drive system for the direct main drive of the weaving machine disclosed by the invention has the characteristics of simple structure, small starting current and large starting torque. Heavier current passes through the motor winding by exerting the voltage higher than that of an asymmetric bridge power converter on the motor winding when the weaving machine is started, so that the starting torque of the motor is improved, so as to meet the requirement of fast start of the direct main drive of the weaving machine, thereby rated work rotating speed is achieved while beating-up is carried out for the first time by the weaving machine achieves, and generation of start-up marks of fabric is avoided.

Description

technical field [0001] The invention relates to a switched reluctance motor drive system, in particular to a motor drive system for direct main drive of a loom. Background technique [0002] The function of the main drive of the loom is to transmit the power of the motor to the main shaft and its related moving parts through the transmission mechanism to realize various actions of the loom. It should be at or close to the speed of normal operation; the braking is smooth and fast, the parking position is accurate, and it meets the process and operation requirements. [0003] The main transmission system of the loom is divided into two categories: direct type and indirect type. The indirect transmission mode is that the motor drives the main shaft of the loom through a friction clutch, and the clutch and brake are used in pairs. Usually, the motor is always rotating, and the start or brake of the loom is controlled by manipulating the engagement and disengagement of the clut...

AI Technical Summary

Problems solved by technology

The asymmetric bridge power conversion circuit is used as the SRM power converter. With the increase of the motor speed, the current of the motor winding is difficult to increase due to the increase of the rotating potential, and the output torque of the SRM is proportional to the current, and the output torque Limited, unable to meet the fast start-up requirements of the direct spindle drive of the loom, causing starting marks on the fabric

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