With the development of modern industry, belt conveyors have gradually become the main equipment for bulk materiacarrying.t develops towards long distance and large capacitly,and the structural form towards complexity and diversifica-tion.The driving method has also improved to multi-point drive from single-point drive in the past. As the confiqurationpowencreases, reguirements including reliable operation and reducing maintenance become more prominent, and the perma.nent magnetic pulley drive system comes into being.

(l)Features of permanent magnetic pulley:
1. Safe and reliable
(1) The transmission chain is shortened, which makes the drive system run more smoothly, with less vibration, lower noise and improved reliability.
(2) Accuracy loss caused by mechanical wear has been effectively controlled, and the service life be-
comes longer.
(3) lt can be started by freguency conversion with no impact, which effecively solves the damaaes causedby the belt conveyor's dvnamic tension wave to the belt and the equipment.
(4) The permanent magnet motor used has good controllability and can better solve the multi-driving ratebalance problem of long-distance and large-capacity belt conveyors.
(5) The frequency converter can be used to match reactors and filters, which will not pollute the power gridand interfere with the normal operation of other equipment.
(6)Less components is convenient for installation.
2. Easy to maintain
(1) The motor and the pullev can be separated throuoh a special couplina device, which has low mainte-nance difficulty, less workload and low cost.
(2) The maintenance cycle is extended and the downtime is reduced, so that the system can continue tooperate reliably and the production efficiency is improved.