Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Spring applied safety brake for servomotors

30.07.2013
Mayr power transmission is presenting an alternative to permanent magnetic brakes (PMBs) for use in servomotors at the EMO:

The spring applied "ROBA-servostop" safety brake works according to the so-called "fail-safe" principle, and therefore provides maximum safety even in the event of a power failure or emergency stop. As a result, it is predestined for application in the gravity loaded axes of machine tools, handling gantries or assembly equipment.


The spring applied ROBA-servostop safety brake permits ten times the load-mass ratio in comparison to permanent magnetic brakes.

Normally, servomotors are fitted with PMBs, which are relatively cost-effective and provide performance density. However, this cost advantage is diminishing, due to the fact that magnetic materials have become extremely expensive. The drive specialist therefore now sees a positive opportunity for the safety brake. It is less sensitive than the PMB, given that permanent magnets can lose magnetic force when subjected to the often extremely high temperatures of up to 120°C in today's motors, which can then lead to a drop in braking torques.

When the spring applied safety brake is closed, the rotor with the friction linings is held between the armature disk and the brake plate. If the installed magnetic coil is energized, then the magnetic field pulls the armature disk against the force of the springs to the coil carrier, thus releasing the brake. The servobrake works safely and reliably thanks to this fail-safe principle.

The ROBA-servostop permits ten times the load-mass ratio: Normally an order of magnitude of 3:1 or smaller is selected for servodrives for favourable regulation characteristics and high dynamic load-mass ratios from load to motor. The ROBA-servostop permits load-mass ratios of 30:1 and more thanks to its high permitted friction work and friction powers. Whilst permanent magnetic brakes tend to cause a sharp rise in braking torques under such conditions, use of the ROBA-servostop avoids any damage to the drive line.

The high performance capability and low wear, as well as the simple installation, are further advantages of the ROBA-servostop, which can be integrated into the B bearing side of the motor without any restrictions.

Contact:
Chr. Mayr GmbH + Co. KG, Eichenstraße 1, 87665 Mauerstetten, Dipl.-Ing. (FH) Hermann Bestle
Tel.: 08341/804-232, Fax: 08341/804-49232
E-Mail: hermann.bestle@mayr.de, Web: http://www.mayr.com

Hermann Bestle | Chr. Mayr GmbH + Co KG
Further information:
http://www.mayr.com

More articles from Machine Engineering:

nachricht A sensor system learns to "hear": Reliable detection of failures in machines and systems
05.12.2018 | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP

nachricht Thick metal sheets? Laser welding!
30.11.2018 | Laser Zentrum Hannover e.V.

All articles from Machine Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Topological material switched off and on for the first time

Key advance for future topological transistors

Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...

Im Focus: Researchers develop method to transfer entire 2D circuits to any smooth surface

What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.

Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...

Im Focus: Three components on one chip

Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.

Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...

Im Focus: Substitute for rare earth metal oxides

New Project SNAPSTER: Novel luminescent materials by encapsulating phosphorescent metal clusters with organic liquid crystals

Nowadays energy conversion in lighting and optoelectronic devices requires the use of rare earth oxides.

Im Focus: A bit of a stretch... material that thickens as it's pulled

Scientists have discovered the first synthetic material that becomes thicker - at the molecular level - as it is stretched.

Researchers led by Dr Devesh Mistry from the University of Leeds discovered a new non-porous material that has unique and inherent "auxetic" stretching...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

Expert Panel on the Future of HPC in Engineering

03.12.2018 | Event News

 
Latest News

Electronic evidence of non-Fermi liquid behaviors in an iron-based superconductor

11.12.2018 | Physics and Astronomy

Topological material switched off and on for the first time

11.12.2018 | Materials Sciences

NIST's antenna evaluation method could help boost 5G network capacity and cut costs

11.12.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>