Calnetix Technologies specializes in high-speed rotating machinery supported by patented active magnetic bearings (AMBs), which help optimize system efficiency and enhance reliability and sustainability.
We offer Powerflux™ Magnetic Bearings in radial and side by side combination configuration and Xcelflux™ Magnetic Bearings with a unique coil architecture. The unique advantages of Calnetix’s active magnetic bearings include the following:
Powerflux™ AMBs utilize homopolar permanent-magnet-bias magnetic fields in conjunction with an electromagnetic field, whereas Xcellflux™ AMBs use heteropolar electromagnetic bias fields in conjunction with electromagnetic control fields. Both products are low-cost and easy to assemble, as shown and described below.
Magnetic bearings do not function on their own; they require multiple components working together as a unique system. Calnetix has designed and developed all of the components that make up the active magnetic bearing system, and these components are shown and described below.
The actuator in an active magnetic bearing is the electromagnet that applies a controlled force to the shaft of a machine to control its position. A radial actuator consists of a lamination stack with control coils and poles arranged to give two orthogonal axes of control. An arrangement of permanent magnets is also used in Calnetix actuators to produce a linearizing bias flux. Other AMB manufacturers produce the linearizing flux with a DC current in the control coil. Two other common actuator configurations are a combination radial/axial actuator and a stand-alone axial actuator.
To learn about the operational principle of homopolar, permanent magnet-biased active magnetic bearing, please clickhere.
Different types of position sensors have different combinations of properties, making some of them more suitable for a given application than the others. However, in the industrial environment, it is typically preferable to have one technology that would cover as many applications as possible. From a wide variety of the available technologies, including optical, capacitive and electromagnetic position sensors, the latter appears to be the most universal solution. Calnetix utilizes four types of sensors, depending on the application specifics:
All sensors include the sensitive element (sensor head) located in the machine, where the displacement needs to be measured, and sensor electronics, typically located in the Magnetic Bearing Controller (MBC).
The most common backup bearing configuration used by Calnetix is two duplex pairs of angular contact ball bearings preloaded face-to-face (DF). This mounting requires the bearing outer races to be clamped – either hard or through a spring – on the outer race. Hybrid bearings with conventional SAE 52100 steel races and SiN3 balls are standard. Backup bearings for high-speed applications are usually cageless and use either a grease film, dry film lubricant or a light grease fill.
More detailed information or functionality can be accessed through the action buttons: Digital Signal Processors (DSP) Actions, View Logs, Fault Summary, View/Set Parameters and Measurements. The additional functionality includes:
Active Magnetic Bearings (AMBs) have been in commercial rotating machinery for over 30 years, offering increased performance and extended machine lifespan due to frictionless operation and the lack of wearable parts. There has been an industry-wide increase in the production of magnetic bearing systems, which has led to overall cost reduction and more rapid market adoption. Some of the advantages of switching to magnetic bearings, include:
To see more information about AMB advantages,click here.