Positioning Control
1.2
Diversified actuators
• A power source which moves an element in a system is called actuator. A unit which detects
a position of a work piece or moving part is called sensor.
• Diversified actuators and sensors, from simple ones to enhanced ones, are used in
positioning.
• This paragraph describes representative types, their features and weak points.
•
Air source and high grade piping are
required.
•
High torque is not available.
•
Multi-point positioning is complex and
very difficult to achieve.
•
Change in positioning is difficult.
•
Positioning mechanism is simple.
•
Repeatability is poor.
•
Change in positioning is difficult.
(When optical sensors or limit switches are
used for stop)
•
Frequent positioning is available.
•
Life of friction plate is limited.
•
Change in positioning is difficult.
(When optical sensors or limit switches are
used for stop)
Pneumatic
Brake motor
Clutch brake
The World of Positioning Control 1
1-2