P11582: PCC Rivet Inspection Automation
/public/

Stepper Motors

Calculations

Rotational Stage Direct Drive

public/Equations_2.png

Using the above equation will provide the necessary torque required for the stepper motor to have.

Definitions:

p = Density of Chuck (oz/in3) = 4.48

L = Length of Chuck (in) = 3 1/16

r2 = Radius of Chuck (in) = 3/4

N = Angular Velocity of Load (RPM) = max 400

ta = Time to Accelerate (seconds) = 0.075

public/Equations_3.png

Linear Stage Lead Screw

public/Equations_4.png

Using the addition of these two Equations will provide the necessary torque required for the stepper motor to have.

Definitions:

d2 = Lead of Screw (in/rev) = 0.025

WL&C = Weight of load and carriage (oz) ≈ 40 oz

e = mechanism efficiency = 75-85%

p = Density of Lead Screw (oz/in3) = 0.289 (lb-in) = 4.64 (oz-in)

L = Length of Lead Screw (in) = 12

r2 = Radius of Lead Screw (in) = 3/16

VLoad = Linear Velocity of Load (in/sec) = 1.25

ta = Time to Accelerate (seconds) = 0.075

u =Coefficient of Friction = 0.001

public/Equations_1.png

Motor Choice

From McMaster-Carr: NEMA 11 Frame Motors

Torque (lb-in): 0.860

Full Load Amps: 0.67

Part Number: 6627T22

Each: $99.74

Rationale:

Document Links

Stepper Motors (Word)


System Drawings | Stages | Chuck | Motion Controller | Digital Micrometer | Additional Hardware | Measurement Logic | Bill of Materials

Home