After adjustment of the yarn tension at one spindle, all brakes are adjusted accordingly, no further measuring of the yarn tension is required. The brake force is created by a magnetic field, not by friction, thus alterations of yarn tension by dirt are avoided.
One of the performance enhancements of the ERD brake is the electrically-released hydraulic amplified (ERD-H) brake which combines spring force and hydraulic force to achieve the optimal torque needed for a specified deceleration rate and stopping distance. The hydraulic amplification is variable depending on the load weight capacity required. A hydraulic piston is integrated in the shell of the master cylinder, and the hydraulic force applied is proportional to the load on the forks. The ERD-H is particularly suitable for ride-on trucks with high load capacity, such as order pickers and pallet trucks. Torque capacities range from 15 to 75 lb./ft. (20 to 100 Nm).
While innovations in technology lead to a broader use of electromagnetic brakes, there are ups and downs on the technology which one should be aware of. For example, while braking power using Eddy currents is higher than anything else achieved by physical friction, installing an electromagnetic braking system requires extra space as well as regular the other hand, lower component and installation costs motivate engineers and automotive manufacturers to intensify research to develop smaller and more efficient electromagnetic braking system, capturing higher levels of kinetic energy in recovery modes. While a perpetuum mobile cannot be achieved under normal circumstances, it is the duty of scientists and technologists to try and get as close to it as possible.
However, slip torque is not perfectly smooth below about 20 RPM (depending on driveline stiffness) due to 'slip-stick', also called 'chatter'. The amount may not be noticable under many conditions. If the Hysteresis dynamometer web in not elastic, slow RPM is probably OK. Unwinding a very elastic web at very low RPM is not recommended. The web will stretch, then the brake will release, then the web will contract.
IN MOST CASES - - these leaks tend to start small and slowly get worse. It is pretty unlikely for a seal to create a sudden and major leak which would cause the parking brake to apply. Usually, it starts with mild seepage from the hydraulic cylinder, and over time the leak becomes large enough to cause cycling of the pressure pump and torque controller maybe a noticeable drop in the fluid level of the AutoPark reservoir. In many cases, the seal has lost all of its flexibility and can look pretty bad before it starts leaking. This gives rise to a situation where you may have a very marginal seal, but still no outward signs that would indicate this.
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