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NTN opens a bearing that is equipped with a 40-fold rotating sensor
Source: China Bearing Network Time: 2017-11-29
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NTN and France's SNR jointly announced the rotation of the bearing to the maximum 40 times the original bearing "equipped with high-resolution rotary sensor bearing". The new product is used in colorful copiers and rotary control equipment; can achieve high precision; And can save energy.
SNR's sensors are line sensors equipped with multiple electromagnetic sensors on the IC. They use the same ring magnet and electromagnetic sensor as the original product; when the ring magnet rotates; the N and S poles are replaced in front of the electromagnetic sensor. What is different is the measurement method. The N-pole or S-pole of the original product will output a pulse every time it crosses horizontally; compared with the new product, the new product will measure the high-resolution rotation signal continuously between the pole and the pole.
The operation principle of the new product is the same as that of the bearing released by NTN in August 2007 (refer to the report of this site). Inside the line sensor; two sets of electromagnetic sensors are arranged side by side at intervals of 1/2 of the interval; it is assumed that the interval measured from the end of the N pole is θ; then the intensity of the magnetic force is sinusoidal with respect to θ. When the phase is shifted by 90°; the first group of sensors measure the sin wave; the second group of sensors measure the cos wave; the values ​​of sin and cos can be used to determine the polar sum. The orientation between the poles.
The IC scale is 6×7mm. Endian has used the bearing sensor device technology possessed by it; it has completed the miniaturization and high resolution of the bearing. The first batch is put into the ball bearing with an inner diameter of 15mm and an outer diameter of 35mm. The circle outputs up to 1280 products of the biphasic pulse signal (A; Phase B). That is to say; each output pulse corresponds to a rotation viewpoint of about 0.3°. It is also possible to distinguish the direction of rotation.
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