The measuring sensor is one of the key parts of the area measuring instrument. Its performance is directly related to the measuring accuracy. Optical sensors can be divided into two types: First, photoelectric sensors, which have the characteristics of small size, high speed, high cost, high installation requirements, suitable for relatively clean environment, and secondly, photosensitive sensors, which use fluorescent lamps as common light sources. The cost and the installation conditions and the use environment are relatively low. The interface circuit between the area measuring instrument and the measuring sensor can be selected according to the specific circumstances.
Area measuring instruments are available for simultaneous measurement or asynchronous measurement. The so-called synchronous measurement method (rotational speed detection) refers to the on-line detection of the speed of the motor, and based on the speed of the motor, the linear velocity of the measured object is calculated. The asynchronous measurement method is based on the rated speed of the motor to calculate the linear velocity of the measured object, but the fluctuation of the grid voltage will affect the measurement accuracy.
Motor magnet,usually have huge magnetism and high working temperature, neodymium magnets, smco magnets Ferrite Magnet are motor magnets,pending on magnetic properties and unit price, Neodymium Magnet is the best motor magnet of industrial areas.
Neodymium magnets are have the most rich remanence of magnetism, but the working temperature of pure ndfeb magnet is low, formula need adjustment for higher working temperature of neodymium magnet.Surface coating is needed to prevent neodymium magnet from corrosion.
Ferrite magnet are economic magnet which have relatively low magnetism,(1/10) Br of neodymium magnet) thus ferrite magnet in a motor is very big pf size.And because ferrite magnet is weak in magnetic properties,it will cost more electricity while motor works, but ferrite is have high temperature coercivity hence very hard to get demagnetization.
SmCo Magnet are permanent magnet that have highest working temperature while have high magnetic properties.Smco magnets are used in aerospace and military areas, storage reserves of samarium mineral are very limited on earth, Since there is no magnet could replace smco magnet, smco magnets are the most expensive magnets.
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