Guidance and water-cooling options for motor
A
Micromech product story
Edited by the Engineeringtalk editorial team
Feb 24, 2006
Steel wheel guidance feature and water-cooling options available for linear motor.
Two options have been introduced for the BLMA120 linear motor from Micromech - a steel wheel guidance feature and water-cooling.
There have also been internal improvements, for example the magnet bars are clamped rather than glued.
The benefits of steel wheel guidance include higher load capacity and rigidity, and higher thrust force achieving less thermal restrictions.
The water-cooling provides better heat dissipation, which again gives improved thrust force.
These two developments mean the motor can produce 1720N peak force.
The internal improvements have produced a motor that is not only very rugged, but friendlier for maintenance and repair procedures.
The linear motor is suitable for automation applications where there are medium precision requirements (repeatability +/-0.01mm) but high throughput.
The integrated linear encoder (sine-cosine) guarantees repeatability.
Cycle rates can be high as a result of the short settling time.
The motor has a double-sided drive system where the windings are on either side of the magnet bar, thus compensating the forces perpendicular to the travel direction.
This has the advantage that the guide system is only loaded with the carriage weight, the payload and the reaction forces.
Unlike a conventional design, the magnetic fields are used on both sides of the magnet resulting in a more effective use of the magnetic material.
The BLMA is completely contained within the profile and is protected against dust and dirt by a steel strip cover (IP30 rating).
It has a long maximum stroke compared with other linear motors and the trouble-free plastic roller guide mechanism lets it be used in general mechanical engineering and handling technology applications.
The plastic roller guide mechanism has low particle emission, no maintenance and low-noise operation.
Therefore the motor can be used in critical environmental conditions, such as in the food processing or pharmaceutical industries.
The linear guide mechanism is the only remaining mechanical and thus wear-prone component but the guide mechanism of the double-sided linear motor consists of plastic-encased rollers, which have been provided with lifetime lubrication.
An eccentric mounting permits backlash to be eliminated in all directions and on account of the attractive forces cancelling each other between magnet rail and forcer the entire carrying capacity of the guide mechanism is available for the application.
The system has high efficiency, smooth running, freedom from maintenance and robust design.
It is supplied ready for installation and operation thus can be used in individual and series-production applications.
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