AC motor applications demand imagination
A
Lafert Electric Motors product story
Edited by the Engineeringtalk editorial team
Oct 18, 2004
There are some AC motor applications that call for the latest control technology and others that can only be resolved with basic components and a little imagination.
There are some AC motor applications that call for the latest control technology and others that can only be resolved with basic components and a little imagination.
Such a "Kiss" solution was applied to a spring manufacturing machine that required a basic brake function to stop motor shaft rotation at either 0 or 180 degrees to provide a simple means of establishing "stop/start" points during the spring coiling process.
Space was allowed for the AC motor in the design but unfortunately not enough to accommodate a brake and the encoder required for position information.
To overcome the problem, the spring machine manufacturer, Spuhl of Wittenbach, Switzerland approached Elektron (AEG Electric Motors' Swiss agent) to provide a solution.
Yet even AEG's brake motors, which are shorter than typical alternative units because of the optimised motor/brake interface resulting from a common manufacturer, would not fit.
Then the Kiss principle kicked in.
Peter Hanseler, Project Engineer at Elektron, came up with the idea of fitting pairs of permanent magnets at 180 degrees to each other on both the underside of the motor's cooling fan and end face of the motor housing.
The result when the motor is under power the driving force overcomes the attraction of the magnets but when power is removed the shaft is "locked" by the magnets in the desired position until power is applied again.
"Our engineering distributors are chosen not just sell motors but to provide solutions for our customers", says Luca Trevisiol, International Sales Director of AEG Electric Motors.
"This application is an illustration that such all-round engineering expertise can provide novel yet effective solutions to meet customers' needs".
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