Brushless Motors

General Parameters JL = JM = JB = WL = FG = FP = WB = TL = TF = E = g = Load inertia (oz. in. Sec ) Motor inertia (oz. in. Sec2) Belt inertia (oz. in. Sec2) Load weight (oz.) Force due togravity (oz.) Push/Pull force (oz.) Belt weight (oz.) Load torque (oz. in.) Friction torque (oz. in.) Power transmission efficiency (%/100) Acceleration of gravity (386 in./Sec2) Leadscrew pitch(Revolutions/inch) Coefficient of friction (%/100) Rotational velocity (RPM) at motor shaft Rotational velocity (RPM) at load shaft Average move velocity (inches/min)
2

A. Configuration No. 1: GearReduction Mechanics
JM

B. Configuration No. 2: Timing Belt Mechanics

ωM JMG

JLG

ωL

LOAD JL,T ,T L F

JM

ωM

R MP

R MG

R LG

JB
J LP

Additional application specificparameters JGB = Gear Box Inertia JLG = Load gear inertia (oz. in. Sec2) JMG = Motor gear inertia (oz. in. Sec2) RLG = Load gear radius (in.) RMG = Motor gear radius (in.) G = Reduction ratio, RLG/RMG orrated gear box ratio Parameter Torque, T At Motor Reflected to Shaft Motor Shaft TL + TF N/A GE ωLG JL + JLG G2E JL/G2E

ωL

LOAD TL,TF,JL

R LP

P = μ = ωM = ωL = ν =

Additional applicationspecific parameters JLP = Load pulley inertia (oz. in. Sec2) JMP = Motor pulley inertia (oz. in. Sec2) RLP = Load pulley radius (in.) RMP = Motor pulley radius (in.) G = Reduction ratio, RLP/RMPParameter Torque, T Speed, ωM Inertia, J at motor shaft At Motor Reflected to Shaft Motor Shaft TL + TF N/A GE N/A JM+JMP+JB ωLG JL + JLP G2E

Speed, ωM N/A
VERTICAL AND TRANSLATIONAL DRIVE

WLSUPPORT ASSEMBLY

LINEAR BEARINGS

Inertia, J discrete gears Inertia, gear box

JM + JMG JM + JGB

CHEMICAL BATH CHAMBERS PINION RACK

FIGURE 12 Example: Figure 12 illustrates equipment used in achemical etching/ plating process Drive = Motor with a 10:1 Reduction gear head (E=0.80), inertia, JGB = 0.04 oz. in. Sec2, pinion radius, Rp = 1.5”, pinion material = stainless steel, 0.5” thick....