Gravity Compensator

Overview

The art of Magnetic Gravity Compensation is well known in terms of biased or non-biased magnetic bearings. The gravity compensator technology used in this area is usually based on reluctance forces and yields a high passive or active stiffness. For high end 6-DOF controlled Mechatronic applications however it is sometimes more beneficial to obtain a low stiffness between the static and the moving part, since this avoids direct cross talk of parasitic forces from the environment disturbing the accurate controlled moving part. To obtain this Magnetic Innovations developed a patented Magnetic Gravity Compensator series, which has proven itself in various high-end industrial equipment. The MGC can be applied where high speed, high force density and a high reliability & lifetime are required both in normal industrial and in vacuum environments.

Features

Key Features:

•  Magnetic bias force compensates gravity and eliminates static dissipation of coils
•  High reliability and lifetime due to the absence of moving wires
•  Low (contactless) stiffness between static and moving magnet parts
•  No heat load on the moving part, single phase actuator, water cooling possible
•  Suitable for vacuum environments
•  Radial clearance for 6-DOF control
•  High peak and continuous force possible
•  A=including Z-actuator, P=only Bias force

Specs

Technical Data

 

Parameter [unit]

Note

Preliminary models (no water cooling)

A4025_6

P6040_30

A6550-75

A16095_800

OD [mm]

1)

40

60

65

150

Height  [mm]

1)

25

40

50

90

Vertical stroke  [mm]

1)

3

3

3

4

Radial stroke  [mm]

1)

1.2

3

2

2

F-Bias  [N]

1)

6

30

75

800

F continuous [N]

2)

1.5

-

15

100

F peak [N]

3)

4

-

40

400

Cz,x,y stiffness max. (N/m)

1)

30

175

600

6000

Moving mass [kg]

 

0.024

0.040

0.115

2.85

Notes (The specifications above are preliminary values. No rights can be derived from this specification)

1) Standard range at 22°C. Other dimensions and force ranges available upon request

2) Continuous force at 25°C ambient and 155 °C coil temperature, depending on thermal path

3) Peak force for 10 sec. at 25°C ambient and 155 °C coil temperature

Publications
Gravity compensation
Share on facebook
Share on google
Share on linkedin
Share on whatsapp
Share on email