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Common mechanical transmissions include leadscrews, rack & pinion mechanisms,
conveyors, gears, and timing belts. The use of leadscrew, rack & pinion, or
conveyor are common ways to translate the rotary motion of the servo motor
into linear motion of the load.

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The use of a speed reducer such as a gearbox or timing belt can be very
beneficial as follows:

 

1. Reduction of Reflected Load Inertia

As a general rule, it is beneficial to keep the reflected load inertia as low as possible while using the full range of servo speed. SureServo™ systems can go up to 5,000 rpm for the low inertia motors and up to 3,000 rpm for the medium inertia motors.

However, when investigating the effect of different speed reduction ratios DO NOT forget to include the added inertia of couplings, gearbox, or timing belt pulleys. These added inertias can be significant and can totally undo any inertia reduction due to the speed reduction.


2. Low Speed & High Torque Applications

If the application requires low speed and high torque then it is common to introduce a speed reducer so that the servo system can operate over more of the available speed range. This could also have the added benefit of reducing the servo motor torque requirement which could allow you to use a smaller and lower cost servo system.

Additional benefits are also possible with reduction in reflected inertia, increased number of motor encoder counts at the load, and increased ability to reject load disturbances due to mechanical advantage of the speed reducer.


3. Space Limitations and Motor Orientation

Reducers can possibly allow the use of a smaller motor or allow the motor to be repositioned. For example, some reducers would allow for in-line, right angle, or parallel mounting of the motor.