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The earliest encoders on the market were mainly resolvers.
The resolver (resolver/transformer) is an electromagnetic sensor, also known as a synchronous resolver. It is a small AC motor for angle measurement. It is used to measure the angular displacement and angular velocity of a rotating object. It is composed of a stator and a rotor. Among them, the stator winding is used as the primary side of the transformer and receives the excitation voltage. The excitation frequency is usually 400, 3000, 5000HZ, etc. The rotor winding is used as the secondary side of the transformer, and the induced voltage is obtained through electromagnetic coupling.
The resolver can work in some relatively harsh environmental conditions. Due to the sensitivity of electromagnetic interference and the complicated decoding, it is determined to be used for slowing down, but it still has its unique value today, such as the speed feedback of hybrid electric vehicles, which is imperative. Alternative.
Tamagawa resolver is the most widely used brand of resolver in the market.
Incremental type is currently the most used encoder on the market, which can be used to measure angle, displacement, and speed.
The incremental encoder converts the displacement into a periodic electric signal, and then converts this electric signal into a counting pulse, and the number of pulses is used to indicate the magnitude of the displacement.
The output mode of incremental encoder has collector output, voltage output, line drive output (differential output), complementary output (push-pull output).
The shaft type is divided into solid shaft and hollow shaft to meet the different needs of customers in different occasions.
There are many brands of incremental encoders, mainly used in printing machinery, shoe machines, ceramic machinery, glass machinery, inkjet printers, injection molding machinery, elevators, CNC machine tools, computer embroidery machines, embroidery machines, textile machinery, packaging machinery, carton machinery , Oil injection machine, automation equipment, cutting machinery, knitting machinery and other production line automation control fields.
Incremental encoders are currently used in the market by Beford, Omron, Pepperl+Fuchs, Sick, Turck and so on.
At present, the consumption of absolute encoders in the market is not small, and the price of absolute encoders is relatively high relative to the price of incremental encoders, which are mainly used to measure displacement.
Each position of the absolute encoder corresponds to a certain digital code, so its indication is only related to the start and end positions of the measurement, and has nothing to do with the middle process of the measurement.
Absolute encoder printing machinery, shoe machines, ceramic machinery, glass machinery, inkjet printers, injection molding machinery, elevators, CNC machine tools, computer embroidery machines, embroidery machines, textile machinery, packaging machinery, carton machinery, oil injection machines, automation equipment, Cutting machinery, knitting machinery, large-scale machinery and other production line automation control fields.