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Ultimag® Actuators Selection Guidelines |
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Product comparison and links to datasheets |
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The Ultimag® Series has been developed in response to application needs for higher speed and higher torque motion control components. We have found that many applications require a working stroke less than 360°, yet still employ motors with their associated complex and expensive controls and linkages. As a result, a powerful, extremely fast short stroke actuator has many design advantages for industrial, office automation, automotive and medical applications. |
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WARNING: |
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Exposed magnet may affect pacemakers. In the event a product unit's magnet is exposed due to product disassembly, Pacemaker wearers should distance themselves 10 feet from exposed magnet. |
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Principle of Operation |
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Ultimag operates on the simple principle of attraction and repulsion of opposite and like magnetic poles. The permanent magnetic armature has twice as many poles as the stator. In the de-energized state, the armature poles each share half a stator pole, causing the shaft to seek mid-stroke. When power is applied, the stator poles are polarized. This attracts half and repels the other half of the armature poles, causing the shaft to rotate. When the voltage is reversed, the stator poles are polarized with the opposite pole. Consequently, the opposite poles of the armature are attracted and repelled, thus causing rotation in the opposite direction. |
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The Ultimag Difference |
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Ultimag offers a bidirectional, center return function not found in rotary solenoids. Performance wise, Ultimag is substantially faster than solenoids, and can be operated in an on/off mode or proportionally, in both open loop and closed loop systems.
The Ultimag does not offer 360° of rotation which is definitive of motors. With this stroke limitation in mind, Ultimag provides an inexpensive alternative for limited stroke applications, particularly, when total cost of system control is included.
Ultimag actuators offer a 45° total stroke. However, the design is capable of a maximum stroke of 160°. Gears, belts, pulley, etc., can be employed to amplify stroke. In all cases, an increase in stroke will cause a reduction in torque. Please call our engineering department with your requirements.
For shorter strokes, electronic or mechanical stops can be used. By having a unit tooled to perform a specific stroke less than 45°, more torque will be obtained.
When adding the Ultimag to your application, the shaft must be supported to avoid stress fractures to the magnet.
Temperature Limitation
The permanent magnet in the Ultimag is NdFeB. For applications running above 130°C, we do not recommend the Ultimag, since the NdFeB magnets irreversibly degrade after reaching a 150°C temperature. |
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