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AKM releases a 14-bit magnetic rotation angle sensor of ±0.1º angle accuracy that supports off-axis configuration



Asahi Kasei Microdevices Corporation (AKM) has released the AK7455, a magnetic rotation angle sensor IC that supports off-axis configurations, where the sensor is not located on the rotation axis of the magnet.

The AK7455's specific calibration function enables high accuracy angle detection of ±0.1º (typ.) in both shaft-end and off-axis configurations.

Enabling change of the bandwidth setting of the angle calculation circuit, the AK7455 has achieved improved responsiveness during motor acceleration and deceleration.

Off-Axis arrangement Off-Axis arrangement
Shaft-End arrangement Shaft-End arrangement


Supports off-axis configuration

In addition to shaft-end configuration, off-axis configuration is also available, where ICs are placed next to the two-pole magnetized magnets, allowing for greater flexibility in designing.

Off-axis arrangement allows for thinner dimensions. In addition, by configuring a motor system of the hollow structure type, the space can be saved through wiring in the hollow.

Angle error calibration function

The AK7455 has 1st to 4th order calibration parameters. By writing those parameters to an internal EEPROM, an angle accuracy of ±0.1º (typ.) can be achieved in both shaft-end and off-axis configurations.

Improves responsiveness to motor acceleration/deceleration

By allowing the setting of the cutoff frequency of the LPF that is installed in the angle calculation circuit inside of the IC to a wide bandwidth, the AK7455 has improved the responsiveness to motor acceleration and deceleration and has enabled smooth motor control.


Motor control applications

  • Industrial robots and electric actuators
  • Machine tools, textile machinery, and industrial sewing machines
  • Stepping motors and DC brushless motors