Endplay Rb Fapp= W + TH Ru h Lsf Lsmin W EP Lr Lms force force Fapp h

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Endplay Rb Fapp= W + TH Ru h Lsf Lsmin W EP Lr Lms force force Fapp h Lsf = Length of Spring, Free condition (one spring to represent many) Lsmin = Length of Spring, MINimum (upper bearing outer ring bottomed out against housing axial seat) h = height of rotor above bottomed out (varies with Fapp) Lr = Length of motor Rotor (bottom of upper brg to top of lower brg) Lms =Length of Motor Stator (housing axial seat below upper brg to housing axial seat above lower brg) EP = End Play = Lr - Lms (endplay adjustment accomplished by varying Lms for this motor) Fapp = total APPlied Force (Weight + THrust of pump) Ru = Reaction force on rotor from Upper bearing Rb = Reaction force on rotor from Bottom bearing K = spring constant (assumed constant if Lsf-Lsmin << Lsmin) Fspring = K*(Lsf –Lsmin - h) [when not bottomed out] Static Force balance: Ru = Rb + Fapp *Simplifying assumption: all parts have stiffness much higher than springs => all others considered infinite stiffness. Neglect differential thermal growth which is unknown. If differential thermal growth brings endplay to zero, then the charts below don’t apply. h Lsf Lsmin Lr Lms Rb Fapp= W + TH force force <=Ru with lower EP K*(Lsf-Lsmin) Ru = K*(Lsf-Lsmin- h) Slope=1 K*(Lsf-Lsmin-EP) Ru K*(Lsf-Lsmin- EP)-W Rb <=Rb with lower EP Rb Fapp h EP W Fapp = K*(Lsf-Lsmin- EP) Rb = K*(Lsf-Lsmin- EP)-Fapp

Lower Brg Detail - ADJUST ENDPLAY WITH PIECE 10 Inner cap Bolts Spacer (steel) ENDPLAY ADJUST Bearing Bearing nut Bearing Bracket * Shaft threads Lock Washer Shaft Centerline Steel & Insulating Washers * * Outer Cap

Upper bearing – edited to add spring Bearing Bracket Upper and lower bearing brackets are attached to opposite ends of motor frame.