Motor Selection Calculations 03

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（Vietnam）Oriental Motor Asia Pacific Pte. Ltd. - Manufacturer of Motion Control Products > Technical Support > Motor Selection Calculations 03

Selection calculation motor

Moment of inertia J [Kg · M 2 calculation formula]

Motor selection formula

Moment of inertia J [Kg · M 2 calculation formula]

Formula for the inertia J［kg・m2］

Inertia of a Hollow Cylinder

Inertia on Off-Center Axis

Inertia of a Rectangular Pillar

Inertia of an Object in Linear Motion

Conversion formula for the moment of load inertia of the motor shaft when using a deceleration gear

Formula for the relation between J and GD2

Density

Stainless steel (SUS304): ρ=8.0×10³［kg/m³］
Iron: ρ=7.9×10³［kg/m³］
Aluminium: ρ=2.8×10³［kg/m³］
Brass: ρ=8.5×10³［kg/m³］
Nylon: ρ=1.1×10³［kg/m³］

J_x: : : Inertia on x-axis [kg·m²］
J_y: :: Inertia on y-axis [kg·m²］
J_x₀: : : Inertia on x0-axis (axis passing through center of gravity )［kg·m²］
m: : : Mass［kg］
D₁: : : Outer diameter［m］
D₂: : : Inner diameter ［m］
ρ: : : Density［kg/m³］
L: : : Length［m］