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Date: 2015-10-07; view: 464.

Match the first part of the sentence (1-9) with the second one (a-i). Translate the following sentences.

1 The mechanical components in a motion control system can be …

2 Product flow and throughput, and maintenance issues help …

3 Mechanical actuators convert a motor's …

4 Mechanical methods for accomplishing include the use of …

5 Method selections are based on the rel­ative costs of …

6 All actuators have finite levels of torsional and axial stiffness that …

7 The linear stage supports the mass of the load to be actuated and …

8 The motor turns the ballscrew, and its rotary motion is translated into …

9 A ballscrew-driven single-axis stage with a rotary encoder coupled to …

A …more influential in the design of the system than the electronic circuitry used to control it.

B …to determine the mechanics.

C …rotary motion into linear motion.

D …leadscrews, ballscrews, worm-drive gearing, and belt, cable, or chain drives.

E …the alternatives and consideration for the possible effects of backlash.

F …can affect the system's frequency response characteristics.

G …assures smooth, straight-line motion while minimizing friction.

H …the linear motion that moves the carriage and load by the stage's bolt nut.

I …the motor shaft provides an indirect measurement.

Position feedback is the most common requirement in closed-loop motion control systems, and the most popular … (sensor/device/instrument) for providing this information is the rotary optical encoder. The axial … (shafts/valves/bolts) of these encoders are mechanically coupled to the drive shafts of the motor. They generate either sine waves or pulses that can be counted by the motion controller to determine the motor and direction of travel … (to per­mit/ enjoin/ forbid) precise positioning.

Absolute rotary optical encoders produce … (binary/ double/ dual) words for the motion controller … (power/ because of/ owing to) failure, these encoders preserve the binary word because the last position of the encoder code wheel acts as a memory.

Linear optical encoders, by contrast, produce pulses that are proportional to the actual linear distance of load movement. They work on the same principles as the rotary encoders, but the grad­uations are engraved on a stationary glass or metal scale while the read head moves along the scale.

Tachometers are generators that provide analog signals that are directly proportional to motor shaft speed. They are … (mechan­ically/ automatically/ geometrically) coupled to the motor shaft and can be located within the motor frame. After tachometer output is converted to a digital format by the motion controller, a feedback signal is generated for the driver to keep motor speed within preset limits.