Today, the Precise Electric Rotating Machine Factory introduces you to some of the latest technologies in modern society. I hope we can learn some knowledge.
The objective of a mechanical method built for movement control would be to correctly move or place a load. In an perfect system, the load is coupled to, and immediately driven by, a rotary motor. There are lots of methods for this drive procedure isn't possible and a drivetrain must induce the load. Some frequent drivetrains contain:
Ball or lead screws
Belt and pulley
Chain and sprocket
Gear trains or rack & pinion
Hydraulics
Each one of those drivetrains introduce mistakes in the setup that affect positional accuracy and repeatability of this load. These mistakes can be introduced for a number of motives: compliance, driveway slide, pitch variance, backlash, friction, misalignment, and wear are one of the most frequent. Most mistakes are a consequence of tolerances and compliance, each of which are inevitable in real systems. Some position mistakes can be assumed constant with time, for example continuous backlash. Others change with time, or loading like pitch variance, wear, as well as compliance. In the instance of hydraulics, the job of the load is subject to dynamic aspects like variation in temperature, pressure, deadband or hysteresis, along with many others. Systems built with elements which have tight tolerances, are rigid, and included of non wear parts, can attain a high level of precision and repeatability with all the opinions found on the drive engine. On the other hand, the elements required have greater price relatively, which increases the total cost of a machine.
The greater price for precision parts isn't always feasable or justifiable and much more cost effective components have to be selected to the drivetrain. The trade-off is raised mistakes introduced with the drivetrain from looser tolerances or the inclusion of elements with compliance. When the errors introduced with the drive mechanisms are larger than the machine demands, a different opinions configuration is necessary. Without opinions on the load, small can be done in order to compensate for the place mistakes introduced since there's not any method to assess the load's real position.
An alternate encoder configuration sets one encoder right on the load. The resolution of this load place is a direct use of the encoder resolution. But this configuration has been unstable since the non-linearities and resonances of this machine are now a part of the management loop.
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