Antenna Pointing Systems (APSs) are devices that align antennas to satellites for transmitting and receiving data, such as in-flight entertainment. The Celera Motion Infinity Series motors are low profile, ultra-thin, with an arc form factor to fit to any antenna shape. Paired with the high resolution IncOder rotary sensor enables highly reliable position sensing for these devices.

The Challenge

Antenna Pointing Systems (APSs) are compact and lightweight systems that align antennas to satellites for transmitting and receiving data. One type of APS is utilized on an airplane to deliver in-flight entertainment via on-board Wi-Fi. These devices are placed on the exterior of the plane, exposed to environments with drastic temperature changes. The device needs to be light and have a low profile to reduce drag on the aircraft, saving fuel costs. Ka or Ku Band channel frequencies are transmitted and received between the aircraft and Fixed Service Satellites (FSS), requiring rotation and elevation of the beam as the aircraft transits. As aircraft move toward use of LEO/ MEO High Throughput Satellite (HTS) services, the antenna system requires highly dynamic and precise positioning to maintain transponder performance when tracking quickly orbiting and setting satellites.

The Solution

The Celera Motion Infinity Series motor is a low profile direct drive motor that is ultra-thin and arc-shaped. Segments of the motor can be used individually or combined to create a full circumference up to 360 degrees. The ironless direct drive motor delivers smooth motion required for accurate positioning, needed to make precise movements. Coupling the motor with the Celera Motion IncOder, a high resolution rotary inductive position sensor, enables highly reliable position sensing. The rotary sensor is available up to 595 mm outer diameter (OD) form factor as a standard product.

The Benefit

The ultra-thin, light weight Infinity Series delivers the low profile needed for an APS with minimal weight requirements. The ability to design any outer diameter (OD) size allows the Infinity to form to any antenna shape. When using the 360 degree design, the large through hole provides space for routing of cables and other system elements. High power density and dynamic motion, coupled with the robust and reliable inductive position sensing IncOder, enables the antenna to be positioned quickly, ensuring a high transponder throughput.


ConfigurationAxial arc-segment forcers
Continuous Torque0.65 to 63.4 Nm
Peak Torque1.95 to 190.2 Nm
Outer Diameter112 to 765 mm
Height (Axial Length)20 to 40 mm
Peak Current3.4 to 4.5 Amps
Resolution22-bits possible
Repeatability+/- 1 bits
Outer Diameter37 to 595 mm
Operating Temperature-60 to 105°C possible