No Battery. No Gears.
Achieve multi-turn detection while minimizing the complex design considerations of conventional methods
A solution that addresses battery shipping restrictions, turn-count range, and low-profile design requirements
Do your designs require batteryless multi-turn detection and an extended turn-count range?
Battery-backed, geared, and Wiegand-based methods are commonly considered for multi-turn detection. In actual product design, however, each method has its own design considerations. Conventional solutions have typically required extensive evaluation of factors such as component placement constraints and measures to prevent count errors.
Battery-backed method
Although position can be retained while the main power is off, the battery introduces transportation and storage controls and restrictions. Battery replacement and service life also complicate long-term reliability and maintenance planning. In addition, the battery consumes valuable enclosure and PCB space.
Geared method
Multi-turn position can be detected mechanically, but the measurable multi-turn count is limited by gear size and the number of gears that can be installed. Gear wear and assembly accuracy must also be considered. In addition, the gear train consumes enclosure space and can limit product miniaturization.
Conventional Wiegand-based method
Rotation can be detected during power-off operation without a battery, but the design must account for magnet and sensor placement constraints and measures to prevent count errors. Relevant existing patents must also be considered during design and development.
AKM's new multi-turn solution retains multi-turn position without a battery or gears
Asahi Kasei Microdevices (AKM) offers a multi-turn solution that requires neither a battery nor gears.
By combining the AK7435, a Wiegand sensor, a multipole magnet, and FeRAM, the solution enables multi-turn detection without an external battery or gears. Compared with conventional Wiegand-based methods, it minimizes component placement constraints and the need for countermeasures against count errors.
The AK7435 is an IC that manages the multi-turn count. Its compact 3 mm x 3 mm package is suitable for integration into 20 mm-square compact servos and encoders, helping reduce both system size and cost.
A low-profile, batteryless multi-turn solution with minimal design burden
Compact, low-profile 20 mm x 20 mm configuration
Combining the AK7435 (3 mm x 3 mm package) with an AKM-recommended Wiegand sensor enables a compact, low-profile batteryless multi-turn configuration. This supports integration into compact servo motors and encoders, as well as replacement of existing modules.
AK7435 (3 mm x 3 mm package)
Layout proposals tailored to your design requirements
Drawing on many years of magnetic sensing technology and application expertise, AKM proposes layouts for the sensor, magnet, and peripheral components tailored to your design requirements.
For example, layout recommendations that account for the surrounding operating environment help achieve an optimized system-level implementation.
Minimize count errors and ensure reliability with a simple architecture
AKM's new solution delivers stable multi-turn counting with a simple system architecture.
Because it requires no specialized components and consists of a standard nonvolatile memory device and a single Wiegand sensor, the design can be flexibly adapted to your sourcing policies and cost targets.
Request technical materials for AKM batteryless multi-turn detection
AKM provides technical documentation to support evaluation of its batteryless multi-turn solution. Please complete the form to request the documents.
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