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The key to many motion applications is in sizing the drive components lying between the motor and load. Here are the basics. • The overall design determines basic drive mechanisms. • Motor-gearing combinations typically determine gear reduction ratios and other key parameters. Wikipedia page on gear ratios, It can be difficult to specify drive components that transform power from a motor into a form that is useful for the load. The overall design may dictate use of basic drive mechanisms such as spindles, gearing, or belts. But the motor or motor/gearing combination determines the parameters that are optimum. These parameters can include spindle pitch, gear reduction ratios, and other factors. Drive-system components, in turn, influence the dynamic response, control quality, and positioning accuracy. The promulgation of automation has thrust many engineers into the role of specifying drive parameters. So it can be useful to examine the equations that describe how drives transform one form of mechanical power into another: Linear-motion drives convert a motor's rotary motion into linear motion. Rotary drives convert motor rotation into some other kind of rotation, typically either at a different speed ratio or with an intermittent motion. Linear drives include leadscrews, conveyor belts, cranes, and rack-and-pinion drives. Rotary drives include all types of gearheads and (toothed) belt constructions. It typically takes just a few parameters to describe the conversion of power in such drives. The more common ones include reduction ratios, efficiency calculations, mass inertia, and a description of mechanical play. indicates the ratio between the angular velocity at the input ω ) and the angular velocity at the output  ω ). In linear motion drives, we define the reduction ratio as the ratio between ω ) and the output velocity . For calculating input speed the following equations apply: • i π/30 • n The reduction ratio for rotary transformation is given as a dimensionless ratio between two speeds of rotation.

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Gearmotors
Gearmotors consist of an AC or DC motor with an integral gearbox or gear head typically used to adjust the motor's output speed and torque.
Gearboxes and gearheads, also called gear reducers or speed reducers, are power transmission devices that use a gear arrangement in an enclosed housing to transfer energy, increase torque and reduce speed from one device to another. Gearboxes may also be referred to as gear reducers or speed reducers.
AC Motors
AC motors include single, multiphase, universal, induction, synchronous, and gear motors. They also include servomotors.
Rotary Stages
Rotary positioning stages are devices with tables or shafts that may be rotated to any angular position. They may be driven or simple slides.
Rack and Pinion Gears
Rack and pinion gears are used to convert rotation into linear motion.

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##### Topics of Interest

William A. Bradley III American Gear Manufacturers Association (AGMA) Alexandria, Virginia GEARS AND GEAR DRIVES The major uses of gears and gear drives are to transmit power, with...

In the past, machine builders often made their own linear actuators. They typically assembled, programmed, and troubleshot multiple components from different suppliers, including separate servodrives...

Automation equipment is constantly seeking increased throughput-it's a never ending requirement. For power transmission components, this translates into either higher motor speeds or lower gear...

Timing belts are parts of synchronous drives which represent an important category of drives. Characteristically, these drives employ the positive engagement of two sets of meshing teeth. Hence, they...

An advantage to building a complex system from simple components by using a few control principles is that complexity is reduced by decomposition. In normal cases it is also comparatively easy to...

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