Abstract: The acceleration errors generated during the speed sampling process decrease the inertia identification accuracy of permanent magnet synchronous motor (PMSM) drives under low acceleration ...
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Why ships have two big metal balls on the compass stand, the simple fix for a steel ship’s magnetic errors
Modern steel ships warp a magnetic compass with both permanent and induced magnetism, and the binnacle is packed with clever countermeasures to cancel it out. This breaks down hard iron vs soft iron ...
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