Necessity Analysis of Torque Limiter in Permanent Magnet Integrated Motor Drive for Scraper Conveyor
Abstract：To solve the problem of transmission system damage caused by inertial impact when using a permanent magnet integrated motor to drive a scraper conveyor, this paper analyzes the impact torque and energy transfer characteristics under sudden jamming conditions. It is derived that the impact torque generated by the permanent magnet semi-direct drive motor at the moment of jamming can reach 12.3 times the rated torque (for a 700 kW motor, the impact torque reaches 109,948 N·m), far exceeding the response capability of electrical protection. The necessity of mechanical protection by a torque limiter is analyzed and verified. A flywheel simulation experimental device was designed, and after installing the torque limiter, the impact torque decreased by 82%, verifying that the torque limiter can absorb impact kinetic energy through friction slipping and limit the transmitted torque. The analysis shows that the torque limiter can effectively avoid failures such as chain breakage and gear tooth damage. Configuring a torque limiter in the permanent magnet integrated motor drive system is a necessary measure to improve the reliability of the scraper conveyor.
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Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 75-77 )