| 摘要 |
A magnetic tester for hubs employed in disk-memory cartridges is provided to measure the mounting strength of hub armatures, the gross magnetic hub-retaining force, the hub-diaphragm preload strength, the net hub-retaining force, the variation of hub preload with diaphragm deflection, and the variation of hub-retaining force with magnetomotive force. The hub tester includes magnetic pole pieces positioned to accurately simulate the nonlinear flux distribution in a hub armature, an adjustable electromagnet to permit accurate determination of the size of the permanent spindle magnet required in an operative associated disk drive to obtain a given retaining force, an adjustable spindle convertible to accommodate different hub types, means for adjusting diaphragm deflection to vary the preloading force, a pneumatically equalized proof ring that applies symmetrical accurately oriented tensile force to the hub-armature interface, and means for automatic pneumatic and mechanical damping to prevent contingent damage in the event of test-piece failure.
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