2015 Designer's Notebook - 98

Clutches/Brakes
Information Required
Core Diameter = 8 inches
Roll Diameter = 24 inches
Tension = 40 lb
Velocity = 150 fpm

How to Size
Torque = Tension x Radius = 40(12/12) = 40 lb-ft
Maximum clutch rpm =

Velocity
=
π(Core Dia.)

150

π(8/12)

= 72 rpm

150
Minimum clutch rpm = π(24/12)
= 24 rpm

Maximum input rpm* = (maximum clutch rpm) x 1.10 = (72)(1.1) ≈ 79
*we recommend the motor be driven 10% faster than the maximum rollspeed to ensure constant tension in the web
x Slip rpm = 40(79-24) = 314 watts
Slipwatts = Torque
7
7

Magnetic Particle Clutches & Brakes

Use a C-50 Clutch

Information Required
Tension = 150 lb
Motor = 200 rpm
Clutch continually energized

How to Size
Torque = Tension x Radius = 150(6/12) = 75 lb-ft
x rpm = 75(200) = 2142 watts
Slipwatts = Torque
7
7

But clutch is only slipping half the time
watts = 2142
= 1071
2
Use a C-100A Clutch

98

Magnetic Particle Clutches & Brakes



Table of Contents for the Digital Edition of 2015 Designer's Notebook

Table of Contents
2015 Designer's Notebook - Cover1
2015 Designer's Notebook - Cover2
2015 Designer's Notebook - Table of Contents
2015 Designer's Notebook - 2
2015 Designer's Notebook - 3
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2015 Designer's Notebook - Cover3
2015 Designer's Notebook - Cover4
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