Magnetic rotary encoder
Bogen AKP18 magnetic rotary encoder
Open PCB-style absolute head (IP00) at 18-20 bit for integration into OEM assemblies.
Key specifications
| Ingress protection | IP00 |
|---|---|
| Speed (max) | 24,000 rpm |
| Resolution (max) | 20 bit |
| Interface | BiSS-C, SSI |
| Temp | -40 to +100 C |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Typical applications
What a magnetic rotary encoder is
A magnetic rotary encoder measures angle by sensing the field of a magnet with Hall-effect or magnetoresistive sensors. On-axis designs place a diametrically magnetised magnet on the shaft end above a sensor chip; off-axis designs read a multi-pole magnetic ring around a hollow shaft. Signal processing turns the field into absolute or incremental position. Because there is no optical path, magnetic encoders tolerate dust, oil, moisture and vibration, typically with moderate resolution and accuracy at low cost.
When engineers choose a magnetic rotary encoder
Choose a magnetic rotary encoder for robust, compact feedback in harsh or cost-sensitive applications, such as motors, AGVs, robotics, agricultural and mobile machinery. Off-axis rings suit hollow joints. The trade-offs are accuracy and magnetic interference: accuracy is typically lower than optical, and strong stray fields from brakes or motors can affect the reading. For high precision, choose optical. Consider shielding and mounting tolerances carefully.
How to specify the Bogen AKP18
Send these with your enquiry and an engineer can confirm the right AKP18 variant:
- Resolution (bits or counts)
- Accuracy (degrees or arcmin)
- Absolute or incremental output
- On-axis or off-axis ring mounting
- Interface: SSI, BiSS, SPI, PWM or analogue
- Mounting tolerances: gap and runout (mm)
- Environment and IP code
Common mistakes to avoid
- Mounting near brakes or motor magnets without shielding
- Exceeding the allowed air gap or runout
- Expecting optical accuracy from a magnetic encoder
- Overlooking calibration after installation
Bogen AKP18: frequently asked questions
What is the Bogen AKP18?
Open PCB-style absolute head (IP00) at 18-20 bit for integration into OEM assemblies. Published series figures include speed 24,000 rpm, resolution 20 bit. It is available through our supply network, and our engineers can confirm the right variant for your application.
Who makes the Bogen AKP18?
The Bogen AKP18 is made by Bogen (Bogen Magnetics) available through our supply network. Send us your requirement for pricing, lead time, datasheets and CAD.
What is the speed of the Bogen AKP18?
The published series maximum speed is 24,000 rpm. Individual models and sizes in the AKP18 range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Are magnetic encoders as accurate as optical encoders?
Typically not. Magnetic encoders tolerate contamination and vibration well but usually have lower accuracy and resolution than optical encoders of similar size. Self-calibration and good mounting can improve results. For high-precision positioning and metrology, optical encoders remain the usual choice, while magnetic types win on robustness and cost.
What is the difference between on-axis and off-axis magnetic encoders?
On-axis encoders read a single magnet on the end of a shaft, which is simple and compact. Off-axis encoders read a magnetic ring around a shaft, which leaves the centre free for hollow shafts or cables. Off-axis designs are more sensitive to mounting tolerances.
Further reading: Magnetic vs capacitive vs optical encoders · How to select an encoder · Encoders and feedback
Often compared with
Engineers specifying this series often compare it with:
Other magnetic rotary encoder series
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