Mitsubishi Electric MELSEC iQ-F Series User Manual page 3

FX Series Programmable Controllers
Introduction to FX Positioning Control Systems
Actuator(s)
Clutch brake
Stepping motor
DC servo system
General purpose
inverter and
general purpose
motor
AC servo system
8
Features and Drawbacks
• Frequent positioning is possible.
• Life of friction plate is limited.
• Change in positioning is difficult.
(When optical sensors or limit
switches are used for stop)
• Simple positioning mechanism.
• If load is heavy, motor may step
out and displacement can occur.
• Motor capacity is small.
• Precision is poor at high speed.
• Positioning precision is accurate.
• Maintenance is required for motor
brushes.
• It is not suitable for rotation at
high speed.
• Multi-speed positioning is
available using a high-speed
counter.
• High precision positioning is not
available.
• Large torque is not available at
start.
(Specialized inverter is required)
• Positioning precision is good.
• Maintenance is not required.
• Positioning address can be easily
changed.
• It is compact, and offers high
power.
1 The Basics of Positioning Control
Schematic drawing
Speed reducer
Clutch
brake
unit
Motor
Controller
DC servo amplifier
DC servo motor
Motor with brake
General-purpose
inverter
Sheet material
AC servo
motor
AC servo amplifier
1.2 Actuators for positioning
Constant
quantity
feed hopper
Optical
sensor
Can feed
mechanism
Stepping
motor
Lifter
Cutter