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NTN opens high-precision electromagnetic viewpoint sensor
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If the number of poles is reduced; the maximum speed is up to 15,000 rpm and can be used for EV drive motors. Other performance parameters can exceed 15,000 rpm because of the built-in signal handling circuit; therefore, no external processing circuit is required; the system composition can be simplified.
It can be placed in a narrow space of 8mm or less in the axial direction; NTN has announced a rotational position (rotational viewpoint) magnetic viewpoint sensor for the detectable axis. It is integrated with the bearing. It has a ±0.44 degree or less. High precision; therefore it can be used in electric vehicles (EV drive motors and other components.
The motor current is finely adjusted according to the rotation direction of the rotor. This requires the use of a viewpoint sensor that accurately detects the rotational orientation of the motor; the EV drive motor and the electric assist steering wheel motor are in an environment where the energy is increased. There is an oscillation and pollution in the environment; The use of magnetic sensors and resolvers instead of optical sensors. The use of magnetic sensors is mostly the type of detection at the end of the shaft; so far there is no high-precision view sensor that can be equipped for detection of the periphery of the rotating shaft. The rotary transformer also has a need for other preparatory signals. Disposal of the circuit.
The magnetic sensor magnetic device is placed on the outer ring casing to detect the viewpoint. The magnetic ring is provided with two magnetic pictures with different numbers of magnetic poles. When two independent magnetic sensors are used to read the two magnetic pictures; the development The sensor will be widely used in the car wheel speed sensor, etc. The magnetic ring device is in the inner wheel of the bearing. The error amount between the two sets of sensor signals will change with the rotation direction. From the error amount; use the same cursor as the vernier caliper (Sub-foot) principle to obtain the rotation orientation (viewpoint) with high precision. The magnetic sensor was developed jointly with the French SNR company.
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