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The ability to operate slowly, as there is no requirement for train momentum to break up the snow, is often an advantage in mountainous regions, where a high speed derailment could be disastrous. Many rotary plows are not self-propelled, so one or more locomotives are coupled behind it to push the plow along the line. An engine within the plow ...
A linear actuator is an actuator that creates linear motion (i.e., in a straight line), in contrast to the circular motion of a conventional electric motor. Linear actuators are used in machine tools and industrial machinery, in computer peripherals such as disk drives and printers, in valves and dampers , and in many other places where linear ...
Synchronous linear motor actuators, used in machine tools, provide high force, high velocity, high precision and high dynamic stiffness, resulting in high smoothness of motion and low settling time. They may reach velocities of 2 m/s and micron-level accuracies, with short cycle times and a smooth surface finish.
The wedge plow was patented by Charles Lowbaert to keep railways functional during the winter. [8] The wedge plow typically required several locomotives to propel the plow with enough force to push through the snow. High speeds of up to 50 mph (80 km/h) were required to achieve an adequate propulsion for the removal of snow. [10]
Tubular linear motors are used in applications requiring linear actuators with performance that cannot be met by other forms of linear actuators such as pneumatic cylinders or lead screw linear actuators. Either the forcer (the part containing the coils) or the rod (the part containing the magnets) may be the moving part, depending on the ...
Planetary roller screws are used as the actuating mechanism in many electromechanical linear actuators. Due to its complexity, the roller screw is a relatively expensive actuator (as much as an order of magnitude more expensive than ball screws), but may be suitable for high-precision, high-speed, heavy-load, long-life, and heavy-use applications.