In recent years, there has been increasing demand for smaller and more precise encoders. While optical encoder modules offer high precision, their complexity in manufacturing and high cost often present challenges for in-house implementation and integration. Now, Asahi Kasei Microdevices (AKM) has developed a rotary angle sensor IC, AK7440, as a new option for compact and high-precision encoders.
The AK7440 incorporates AKM’s proprietary compound semiconductor technology and enables encoders to achieve optical-class precision in a compact form factor suitable for small motors by combining with a magnetic slit. By combining electromagnetic converted signals from AKM’s compound magneto-resistive elements with a dedicated angle calculation algorithm, the encoder achieves an angle accuracy of ±20 arcseconds, reaching a level of precision that was previously difficult with conventional magnetic sensors. It maintains stable operation even in environments with dust, oil, and other contaminants.
The trade-off between slit miniaturization and angle precision is resolved through a solution that integrates the magnetic sensing technology, signal processing, and angle calculation algorithms. This makes it compatible with 40 mm flange motors, expanding the use across a wide range of industrial applications.
There is a built-in algorithm for correcting mounting-induced angle errors. The angle correction function corrects angle errors caused by slit disk eccentricity, tilt, or misalignment of the IC during assembly, a feature which expands the allowable tolerances in the assembly process and reduces the burden during assembly. Typical applications include absolute encoders, AC servo motors, actuators used in robots, also actuators in industrial transport equipment. For more info, see www.akm.com.
