Your one stop shop for Emco Spring Applied Brakes and Clutches
Single most important factor in selecting brake and clutches of Emco Dynatorq 14.458 or 14.105 or 14.800 is Braking Torque. Torque is a measurement of the propensity of a given force to cause the object upon which it acts to twist about a certain axis. The torque is product of magnitude of applied force and length of the lever arm. For any industrial braking application, there will be a specific torque requirement that the brake must conform to in order to meet the demands of the crane on which it is utilized. Electrical motor torque and mechanical braking torque are the two principle torque values used for this calculations. Motor torque refers to the maximum load the motor can produce. This motor torque has to be overcome by the mechanical torque produced by the brake which means the braking torque must be multiplied by a safety factor.
In case of cross travel and longitudinal travel application, a safety factor of 2 is enough as brake has to hold the rotating load only. For hoisting, a safety factor from 3 onwards is mandatory as brake is not only stopping the load but is holding the load against gravitational force. In hoisting, frequency of operations can be more due to inching process which is used to correctly position the load. More operations leads to more wear of the liner.
A designer must consider RPM at the braking shaft. Braking shaft RPM is directly proportionate to the liner wear. It is also mandatory to use appropriate rectifier and DC switching method to avoid slipping of the load, to control liner wear & to protect the hoist drive.
A brake expert when consulted can save money. A brake slipping before stopping can become a big worry for a maintenance engineer but not until a brake expert advices him to adjust the air-gap or replace the rotor liner. Whatever be the brake issue, a expert will take decision on replacement after studying the physical brake condition. A brake name plate tells a lot about the brake like its application, usage – indoor or outdoor, how long was it in use, rectifier being used, type of rectifier connections done at site. Is the rectifier working or not and many more.