The appearance of an electromagnetism sensor

 

In the sensor of the electromagnetism effect that uses today, magnetism rotates sensor is a important kind. Magnetism rotates sensor is main by semiconductor magnetoresistive component, permanent magnet, fixed implement, the composition of a few parts such as crust. Typical structure is component of a pair of magnetoresistive installation is on the stimulation of a permanent magnet, the input output terminal of component is received fixed implement on, install next in metal carton, reoccupy project is plastic and sealed, form airtight structure, this structure has good reliability. Magnetism rotates the advantage that sensor has a lot of semiconductor magnetoresistive component to cannot be likened to. Besides having very tall sensitivity and very big output signal, and very strong rotate speed detects limits, this is the result that develops as a result of electronic technology. Additional, this kind of sensor still can apply in very big temperature range, have very long work life, fight dirt, water and smeary ability strong, because this is able to bear or endure,suffer all sorts of ambient conditions and exterior noise. So, this kind of sensor gets in industrial application extensive attention.

 

 

Magnetism rotates sensor has wide application in factory automation system, because this kind of sensor is having satisfactory character, do not need to safeguard at the same time. The roll that its basically use in electric machinery of machine tool servo detects, of stroke of the fixed position of the robot arm of factory automation, hydraulic pressure detect, the position of equipment detects related factory automation, rotate the detecting element of coder and the detecting element that all sorts of whirl.

 

Contemporary magnetism rotates sensor basically includes to have 4 photographs sensor and single-phase sensor. In working process, 4 photographs differential rotates sensor realizes differential to detect with a pair of detecting element, another pair of implementation pour differential to detect. Such, of 4 photographs sensor detect ability is single element is fourfold. And of two component single-phase rotate the advantage that sensor also has him, namely cabinet and reliable characteristic, and output signal big, can detect low speed moves, fight an environment influence and capability of the sound that fight a confusion of voices are strong, cost is low. Because this is odd,photograph sensor also will have very good market.

 

Magnetism rotates sensor also has large applied latent capacity in electric home appliances<gj. In the reversing mechanism of box type recorder, usable magnetoresistive component will detect the terminus of tape. The great majority in family expenses videocorder has gearshift and function of high speed replay, this usable also magnetism rotates sensor detects main shaft speed undertakes controlling, acquire the quality of fast picture. The positive and negative of the electric machinery in washing machine turns and high low speed rotates the function can rotate through servo sensor will implementation detects and be controlled.

 

 

Electromagnetism is close to switch

 

This kind of switch is OK the induction arrives enter oneself to examine the metallic object of area, those who dominate him interior circuit leave or close. Him switch produces magnetic field, when the change that metallic object enters magnetic field to be able to cause magnetic field. This kind of change closes in-house circuit to be able to become telegraphic name through leaving.

 

Electromagnetism sensor is the new and high technology with a very wide application, home, abroad threw certain scientific research power undertaking study, each domains that the application of this kind of sensor is being built in economy of infiltrate through countryman, national defence and people lives daily, as the arrival of information society, its position and action are sure more outstanding.

 

The article picks from: Chinese popular science reads extensively