By using a clutch-type permanent magnet coupler to change the main and auxiliary drive modes of air preheater gearbox,improvements are made to the high failure rates of fluid coupler and overrunning clutch in air preheater reducers.The results indicate that the adoption of the clutch-type permanent magnet coupler allows the main and auxiliary motors to be disconnected for online fault inspection,effectively reduc-ing the failure rates of both transmission components.At the same time,the permanent magnet drive modifica-tion has eliminated the output speed difference between the main and auxiliary drive air preheater reducers,enabling the main and auxiliary motors to serve as backups for each other.This has significantly improved the safety and reliability of air preheater reducer.
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