In a precision motion system, knowing that a component moved is not enough. The control system needs to know where it is, how accurately it got there, and whether that feedback remains reliable under actual operating conditions. That becomes much more difficult when the equipment is exposed to shock, vibration, temperature extremes, and limited packaging space.
Choosing the right angular position sensor therefore requires more than comparing accuracy specifications. Engineers need to evaluate the complete operating environment and how the sensor will integrate with the motor, actuator, gearing, controller, and mechanical structure.
1. Start With the Required Accuracy
Accuracy is usually the first specification engineers review, but it should be considered in the context of the complete mechanism.
A sensor may have excellent laboratory accuracy and still deliver inconsistent system-level performance if the mounting structure, bearings, gearing, or shaft alignment introduce errors. For applications such as aircraft control surfaces, gimbals, satellite mechanisms, and precision actuators, repeatability and stability across the operating range are equally important.
CDA InterCorp’s Rotary Transducers include position, velocity, and acceleration sensing, with resolver accuracy available to ±3 arcmin. The designs are intended for applications where dependable feedback is required under demanding operating conditions.
2. Don’t Underestimate Shock and Vibration
High vibration can affect sensor alignment, electrical connections, bearings, and internal components. Repeated shock can create even greater challenges, particularly in aerospace, defense, launch, and downhole systems.
The sensor should therefore be selected for the application’s actual shock and vibration profile, not simply for a typical industrial environment. Mounting, housing strength, connector selection, and mechanical integration all matter.
CDA rotary transducers are specifically designed for extreme shock and vibration loads, with stainless construction and MIL-STD size options. CDA also develops actuators and mechanisms designed for extreme shock and vibration environments.
3. Consider Temperature from the Beginning
Temperature can change material dimensions, lubrication behavior, electrical characteristics, and sensor performance. For systems operating near engines, in high-altitude environments, downhole, or in space, temperature should be treated as a fundamental design parameter.
Depending on configuration, CDA rotary transducers can be specified for demanding temperature environments, with some configurations offering an operating range from -269°C to +260°C. Radiation-resistant and pre-outgassed options are also available for space applications.
This type of environmental capability is particularly relevant to CDA’s Space and Downhole applications, where temperature, vibration, and reliability requirements can push components far beyond conventional industrial conditions.
4. Packaging Is Part of Sensor Selection
A sensor has to fit the mechanism not the other way around. Envelope restrictions, shaft geometry, mounting points, connectors, gearing, and available space can all influence the final design.
This is where application-specific engineering becomes valuable. CDA offers custom housings, connector configurations, mounting arrangements, sensing characteristics, and integrated gearing options for its rotary transducers.
The same philosophy applies when the sensor is integrated into a larger Actuators & Mechanisms assembly rather than treated as an isolated component.
5. Evaluate Reliability at the System Level
For mission-critical equipment, sensor reliability is ultimately part of system reliability. The feedback device needs to work consistently with the motor, gearing, controller, bearings, and mechanical structure throughout the required operating life.
CDA’s experience spans aerospace, defense, space, and downhole applications, where rotary sensors operate as part of larger motion-control systems. Its Aerospace and Defense solutions incorporate position sensors alongside actuators, motors, brakes, and other components.
Frequently Asked Questions
1. What is an angular position sensor?
An angular position sensor measures the rotational position of a shaft or mechanism and provides feedback to a control system.
2. What should I consider when selecting an angular position sensor?
Accuracy, repeatability, shock and vibration, temperature range, packaging, mounting, connector configuration, feedback type, and expected operating life should all be evaluated.
3. Are angular position sensors suitable for aerospace applications?
Yes. Properly engineered sensors can provide reliable feedback for flight controls, gimbals, communications positioning, and other aerospace mechanisms.
4. Can an angular position sensor be customized?
Yes. Depending on the application, customization may include housing, mounting, connectors, gearing, and sensing characteristics.
5. Why does packaging matter?
A sensor that cannot be properly integrated mechanically can introduce alignment errors, reliability issues, or unnecessary system complexity. Packaging should therefore be considered during the initial mechanism design, not after the sensor has already been selected.