Rotation Angle Sensor with Hall Effect for Motor Control
Asahi Kasei Microdevices (AKM) has developed the AK7454, an absolute magnetic rotation angle sensor with improved calibration functionality and considerably-reduced package size. AKM is now shipping samples and plans to begin mass production in October of 2019.
The sensor can be used for motor control applications including robots, machine tools, stepping motors, and dc brushless motors.
The AK7454 integrates an advanced user calibration function, enabling it to calibrate angular errors resulting from mounting misalignment, magnet characteristics, and other factors. Additionally, shaft-end and off-axis configurations are supported.
An internal EEPROM allows programming of a zero-point setting and rotation direction. The sensor features an ABZ output resolution (1 to 4096 ppr), and number of poles of UVW output (1 to 32 pole pairs).
The tracking servo system architecture can track rotation at speeds up to 25,000rpm with an output delay time of 1.2μs. The AK7454 uses a small and thin QFN24 package. The supply voltage range is from 3.0V to 5.5V.
Supports Off-Axis Configuration
The operating magnetic field range of the AK7454 has expanded to cover 10mT to 70mT, allowing off-axis configurations. A shaft-through type motor system can be constructed with this off-axis configuration, helping to make a thinner motor system and enabling the building of a hollow structure.
Angle Error Calibration Function
High accuracy calibration can be done with 16+ points of measurement data in a single rotation. Writing the 1st to 4th order calibration parameters to the internal EEPROM can achieve an angular accuracy of ±0.1deg(typical), even in the off-axis configuration.