Precision Control for Your Operations
MOTION SYSTEM APPLICATIONS
Brakes and clutches in
SCARAs and more
Brakes, clutches and torque limiters work in medical equipment, packaging machinery, industrial hoists, and installations. Recall that brakes stop and hold loads. Clutches and torque limiters disengage and engage power-transmission outputs to transfer torque from an input. Torque limiters modulate power transmission to protect mechanical equipment from overload.
Clutches, Brakes and Motion Control Products Clutches and brakes for complete motion control, designed to meet exact specifications. From ultra-precise medical procedures to heavy equipment across a variety of industries – CJM is everywhere. • electrical, mechanical, pneumatic and hydraulic models • system design and integration • expert engineers working on every order
Engineering Solutions for Clutches & Brakes
www.cjmco.com Phone: 860-643-1531 291 Boston Tpke, Bolton, CT 06043
Brakes clutches & limiters - MC 11-19 V3.indd 30
When selecting clutches, brakes, and torque limiters for an application, options include mechanical, electric, fluidic or self-actuation. Electric brakes are easy to control and cycle, even to a couple thousand cycles per minute. In contrast, common air-actuated brakes and clutches run coolly and maintain hold with minimal power. Friction brakes with disc, drum and cone morphologies work well as emergency brakes because of their failsafe holding — essential on conveyors, escalators, airport-baggage handlers, elevators and other safety-critical designs. The size and type of brake most suitable for a given design depend on whether the machine needs emergency stops or softer stops that sacrifice brakes to protect loads from shock. Then, other application criteria (including the machine envelope, thermal capacity, cycle rates, and inspection and repair schedules) dictate the final selection. In other machines, it’s more important that brakes prevent shifting loads and misalignment. In most cases, it’s best to size brakes and clutches to the motor torque of the machine axis. But especially for axes where the brake must stop a vertical load, engineers should account for the fact that motors can temporarily draw added current to output
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DESIGN WORLD — MOTION
BXW spring-applied brakes from Miki Pulley excel in large SCARA applications.
more than their rated torque. Helpful resources include published performance curves from brake and clutch manufacturers. These list dynamic torque ratings for various operating speeds to help engineers match brakes and clutches to peak motor-output torque. 11 • 2019
11/18/19 3:45 PM
