Parker Compumotor OEM350 User Manual

Parker Compumotor OEM350 User Manual Manual pdf 30 page image

23OEM650/OEM650X • INSTALLATIONCouplingsThe motor and load should be aligned as accurately as possible. Anymisalignment may degrade your system’s performance. There arethree types of shaft couplings: single-flex, double-flex, and rigid.Like a hinge, a single-flex coupling accepts angular misalignmentonly. A double-flex coupling accepts both angular and parallelmisalignments. Both single-flex and double-flex, depending on theirdesign, may or may not accept end-play. A rigid coupling cannotcompensate for any misalignment.Single-Flex CouplingWhen a single-flex coupling is used, one and only one of the shaftsmust be free to move in the radial direction without constraint. Donot use a double-flex coupling in this situation; it will allow toomuch freedom and the shaft will rotate eccentrically, whichwill cause large vibrations and immediate failure.Double-Flex CouplingUse a double-flexed coupling whenever two shafts are joined that arefixed in the radial and angular direction (angular misalignment). Donot use a single-flex coupling with a parallel misalignment;this will bend the shafts, causing excessive bearing loads andpremature failure.Rigid CouplingRigid couplings are generally not recommended. They should beused only if the motor is on some form of floating mounts, whichallow for alignment compensation.