Developed high-precision angle sensor for automobiles
High-precision in-vehicle angle sensor "A3MR" (developed product)
This developed product consists of the following elemental technologies. 1. AMR thin film formation technology that detects the direction of the magnetic field with high accuracy even if the magnetic field is non-uniform. 2. Control circuit technology that realizes high-precision 360-degree detection Currently, the mainstream resolver method (* 8) is Although high-precision detection is possible, the size and weight are large, and it was difficult to make a redundant design (* 9) compatible with ISO26262. Magnetic sensors such as GMR (* 10) are also used, but although they are small in size, they have the problems that the angle accuracy is inferior to that of the resolver method and that accuracy cannot be obtained in an environment where a strong magnetic field is applied. The market demands a compact, high-precision sensor that can be used even in a strong magnetic field range, which can replace the resolver method. Rotation angle detection of in-vehicle motor (for electric power steering, ISG hybrid system, shift-by-wire (* 11), etc.) Sample shipment scheduled: May 2017, order start schedule: 2019 September * 1 Angle sensor "A3MR" A sensor that detects the rotation angle of an in-vehicle motor. A mechanism to detect the rotation angle by changing the magnetic resistance value due to the change in the magnetic field generated by the rotation of the motor shaft. "A3MR" is a nickname for Panasonic-developed products. The three A's have the meanings of "Anisotoropic (meaning anisotropy, AMR element)", "Abusolute (measure absolute angle)", and "Accurate (high precision)". * 2 AMR is an Anitorpic-Magneto-Resistance (anisotropic magnetoresistive element), which is one of the elements used in AMR thin film magnetic sensors. * 3 Hall element A type of element used in magnetic sensors, which is a magnetic sensor that uses the Hall effect. The Hall effect is a phenomenon in which when a magnetic field is applied in a direction perpendicular to the current, an electromotive force is generated in the direction orthogonal to both the current and the magnetic field. * 4 ISO26262 (Functional safety) An international standard for functional safety related to the electrical and electronic aspects of automobiles. Functional safety is to ensure the safety of the system even if a certain function or part fails. * 5 When measuring the rotation angle of the motor with the side shaft detection magnetic sensor, place it on the outer circumference of the motor, not on the rotation axis. * 6 ADAS (Advanced Driver Assistance System) An abbreviation for Advanced Driver Assistance System, which is a system that detects and avoids the possibility of accidents in advance. * 7 ISG Hybrid System An abbreviation for Integrated Starter Generator Hybrid System, which is a hybrid system that uses a motor that also serves as a starter and generator. * 8 Resolver method A method in which the rotation angle is detected by the principle of electromagnetic induction, with a configuration in which multiple coils are attached to the rotation shaft of the motor. * 9 Redundant design Arrange a spare function as a backup in case of a defect, and design so that the function can be maintained. When the parts are large, it is difficult to arrange the spare function in the limited installation space, and it is said that redundant design is difficult with the general resolver method. * 10 GMR is a type of element used in GMR magnetic sensors, and GMR stands for Giant Magneto Resistive. * 11 A system that controls the shift-by-wire transmission using electric signals rather than a mechanism such as a shaft. Please see the press release below for the full text. ▼ [Press Release] Developed high-precision angle sensor for vehicles (March 27, 2017) http://news.panasonic.com/jp/press/data/2017/03/jn170327-2/jn170327-2.html
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