Parker Hannifin 88-020292-01 A 7 C ONNECT THE MOTOR TO THE LOAD C

E-AC Drive Hardware Installation Guide Chapter 2 – Installation

7 – CONNECT THE MOTOR TO THE LOAD – COUPLERS

Align the motor shaft and load as accurately as possible. In most applica-

tions, some misalignment is unavoidable, due to tolerance buildups in

components. However, excessive misalignment may degrade your system’s

performance. The three misalignment conditions, which can exist in any

combination, are illustrated and described below.

Aligned

Parallel Misalignment

Combined Parallel & Angular Misalignment

End Float

Angular Misalignment

•Angular Misalignment: The center lines of two shafts intersect at an angle

other than zero degrees.

•Parallel Misalignment: The offset of two mating shaft center lines, although

the center lines remain parallel to each other.

•End Float: A change in the relative distance between the ends of two shafts.

The type of misalignment in your system will affect your choice of coupler.

SINGLE-FLEX COUPLING

Use a single-flex coupling when you have angular misalignment only.

Because a single-flex coupling is like a hinge, one and only one of the

shafts must be free to move in the radial direction without constraint. Do

not use a double-flex coupling in this situation: it will allow too much

freedom and the shaft will rotate eccentrically, which will cause large

vibrations and catastrophic failure. Do not use a single-flex coupling

with a parallel misalignment: this will bend the shafts, causing exces-

sive bearing loads and premature failure.

Use a double-flex coupling whenever two shafts are joined with parallel

misalignment, or a combination of angular and parallel misalignment (the

most common situation).

Single-flex and double-flex couplings may or may not accept end play,

depending on their design.

Rigid couplings are generally not recommended, because they cannot

compensate for any misalignment. They should be used only if the motor

or load is on some form of floating mounts that allow for alignment com-

pensation. Rigid couplings can also be used when the load is supported

entirely by the motor’s bearings. A small mirror connected to a motor

shaft is an example of such an application.

HUCO ROCOM CORP. HELI-CAL

70 Mitchell Blvd, Suite 201 5957 Engineer Drive P.O. Box1069

San Rafael, CA 94903 Huntington Beach, CA 92649 Santa Maria, CA 93456

(415) 492-0278 (714) 891-9922 (805) 928-3851