TAILIEUCHUNG - Types of Servos

EVOLUTION OF SERVO DRIVES The word ‘‘servo’’ is a learned borrowing from Latin where it meant ‘‘slave.’’ Industrial servos had their real beginning during World War II. Some applications were in military gun control and steering control. The evolution of speed and positioning drives since the war is shown in Figure 1. Industrial servos can be classified in four different ways as follows: By use: Cranes and hoists Winders Steering Refrigeration Heating Combustion Machine tool feed and speed Process control Power Guidance By variables controlled: Force Copyright 2003 by Marcel Dekker, Inc. All Rights ReservedTension Level Speed Position Mixture Temperature and humidity. | 2 Types of Servos EVOLUTION OF SERVO DRIVES The word servo is a learned borrowing from Latin where it meant slave. Industrial servos had their real beginning during World War II. Some applications were in military gun control and steering control. The evolution of speed and positioning drives since the war is shown in Figure 1. Industrial servos can be classified in four different ways as follows By use Cranes and hoists Winders Steering Refrigeration Heating Combustion Machine tool feed and speed Process control Power Guidance By variables controlled Force Copyright 2003 by Marcel Dekker Inc. All Rights Reserved s p E D AC Motor Gear Shift Drives SCR DC Servo Drives 0 to 3 000 RPM Variable Frequency AC Drives AC Spindle Drives 0 IO RPM AC Motorized Speed Drives Oto RPM p Ọ 8 1 T I 0 N I N G Motor Generator Drives Ex Amplidyne Metadyne Rototrol Servo-Valve Motor Piston Drives SCR Drives PWM Drives 0 to 300 IPM Brushless DC Rotary Drives 0 to 600 IPM DC Electric Hydrat IC----- -DC E cciric - AC E-ectnc . 1940s IO . Late 1950s 1960s to _ Early 1970s 1970s Io 1980s Late 1970s IO 1980s Linear Brushless DC Drives 0 to 6000 IPM 1980s Beyond Fig. 1 Evolution of industrial servo drives. Tension Level Speed Position Mixture Temperature and humidity Voltage and current Volume Density By type Chemical gasoline paint etc. Electronic AFC automatic frequency control AVC automatic volume control color synchronization Electric drives Hydraulic drives By feedback Regulators Type 0 Servomechanisms Type 1 Acceleration Type 2 CLASSIFICATION OF DRIVES For purposes of this book industrial machine feed and speed servo drives are addressed. Machine drives can be classified further as shown in Figure 2. Copyright 2003 by Marcel Dekker Inc. All Rights Reserved MACHINE PRIVES MECHANICAL HYDRAULIC electrical Spur Constant Mesh Stepping Motor slrvo Servo Gears Parallel Gears Drives Pump Valve Rotary Linear r T T Motor Stepping DC Starter Motor Drives Drives Drives I Motor

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• Industrial servos
• Winders
• Steering
• Refrigeration
• Heating
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