Ironless Linear Motors
An often unasked but important question is, what is unique about an ironless linear motor?
The answer is that ironless linear motors use powerful, permanent magnets to create a strong magnetic field that surrounds the active coil conductors. When current is applied, a force is produced that is directly proportional to the current. There is no iron in or around the coil, and even though this makes the motor slightly less-efficient, it greatly reduces the coil inductance, thus allowing the motor to quickly respond to changes in current with high fidelity.
Additionally, no iron in the coil means that the coil is not attracted to the magnets. This attraction causes a varying preload and varying force – or cogging – that the motor must overcome as it travels. This can add heat to the system, further reducing efficiency. That is why ironless linear motors power the most-accurate motion applications.
Why is the motor used with closed loop control?
Ironless linear motor applications
With Airex’s patented coil winding technology our linear motors are the ideal solution for actuators, precision stages, photonics platforms, semiconductor equipment, pick-and-place systems and inspection systems that require exceptionally responsive control at high bandwidths while simultaneously maintaining a low heat rise. Your solution may require an IRON core linear motor, utilizing high-temperature rare-earth magnets, from our P-Series or C-Series linear motors (all customizable).
Our motor is ideal in ultra-precision direct drive systems. The high intrinsic coil stiffness we employ eliminates backlash and windup inherent in other linear driven systems. Airex’s linear motors also eliminate the wear problems typically associated with ball-screws, belt drives and rack-and-pinion linear motion systems.
Tailored to your needs
A portion of our motors are sold as configured on our website and in the catalog. However, many of our customers customize our linear motors to suit their specific application. The customizations range from simple metric holes to special models specific to your requirements. Categories of customization include:
- Added holes that ease assembly, assist motor mounting and integrate special functions
- Special mounting brackets or custom integration of coil assemblies into customer stages
- Special cables
- Special thermal sensors
- Vacuum compatibility via special fasteners, bleed channels, special platings or materials
- Cleanroom features including special cleaning and packaging
- Custom and private labeling
- Multi-unit coil modules
- Special magnet tracks
- Bracketless coil assemblies (ideal for integration into your stage)