A-DRIVE SERVO ACTUATORS INTRODUCTION
Was bedeutet ROLLER SCREW?
- High Efficiency Screw Mechanism
- Designed in late 1940s
- Not trivial to manufacture as is a ball screw
- Many performance advantages to other screw technology
Was ist ein "Invertierter Planetenrollengewindetrieb?"
- High Efficiency Screw Mechanism
- Developed in 1990
- Used in the patented servo actuators
- The same performance advantages as standard roller screws
- Design of the mechanism is inverted. , Timing Gears (H) from previous picture are on screw shaft (A).
- Rotation of Nut produce linear motion of the Screw and allows a construction of compact servo actuator.
Inverted Roller Screw Features
Much less space for Equal Contact EreaNo Conflicting Friction
Adjacent ball bearings within a ball screw have conflicting friction leading to
heating and wear. The planetary design of a roller screw does no exhibit this
problem. Travel Life Comparison to Ball Screws For similar-sized screw
diameters, a roller screw will have many times the expected service life of a
ball screw.
More contact points per area
Roller screw provides more contact point to Ball Screw per area.
Planetary design
- No conflicting friction (heat)
- More contact points
- No ballistic effect - dynamic
- Continuous contact
- Smooth running
- Higher rotational speed up to 5000 rpm
- High acceleration > 1,5 g
- Higher stiffness through number of parts
Vergleich der Lebensdauer
Testing conditions:
Ball Screw 25x5Roller Screw 25x5
1000 N Continous Force
Result Life Time:
Ball Screw = 50,5 kmRoller Screw = 762 km
Inverted Roller Screw versus Ball Screw, Hydraulics and Pneumatics
Ball Screws
Higher LoadMinimum 15x life for same size screw
Higher Acceleration
Higher Rotational Speed
Higher Stiffness
HYDRAULICS
Lower maintenanceLess Noise
More Precision
Higher Efficiency
Easier Set up
Higher Repeatability
Pneumatics
Lower maintenanceLess Noise
More Precision
Higher Efficiency
Easier Set up
Higher Repeatability
AC Servomotor - Segmented Stator Technology
- Recently introduced segmented lamination motor technology.
- More efficient than traditional brushless motors
- Less heat generation
- More robust insulation system.
- Magnets, insulation and potting all provide more thermally robust motor design.
- 35% torque increase in the same package size.
- UL Class H compliant, 460 Volt insulation rating
Integrated Inverted Roller Screw - Servo Actuator Compact Solution
A = Chrome Plated Output Rod
B = Pre-Loaded Angular Contact Bearing
C = Inverted Roller Screw Mechanism
D = Epoxy Coated Aluminium Housing
E = Neodium Iron Boron Magnets
F = Connectors
G = Encoder or Resolver Feedback
H = AC Brushless Servo Motor (segmented design +35% power)
I = Sealed Output Rod
B = Pre-Loaded Angular Contact Bearing
C = Inverted Roller Screw Mechanism
D = Epoxy Coated Aluminium Housing
E = Neodium Iron Boron Magnets
F = Connectors
G = Encoder or Resolver Feedback
H = AC Brushless Servo Motor (segmented design +35% power)
I = Sealed Output Rod
GSM series exist in 4 packages, GSX in 5 package sizes. Compatibility with nearly all major brands of servo amplifiers. Completely sealed. Compact package design. Multiple mounting configurations.
Servo Actuator Applications - Main industrial applications
Level Winding
Motion Simulation
Plastics - Electric Toggle Cylinders
Food industry - Powerfull cutting
Food industry - Fast filling
Wood industry - Saw positioning