The rotary switch is almost everywhere in our life. Its application is very extensive. It can be seen in electronic equipment and kitchen and bathroom products. Take the most basic faucet switch. It is rotary type. The design, through the rotation to achieve open and close, and even control the size. Many people will ignore this small switch, so today Xiaobian took everyone to understand the use of rotating switches and structural characteristics, take a look at the analysis of the rotary switch. 
Rotary switch use and structural features
1. Uses
Rotary switch has many uses, and its rotation area has a certain range of limitations, mainly the role of the resistance value in changing the contact switch. The channel and volume adjustment of a traditional black-and-white television set is achieved through a rotary switch ; the fan position control is a rotary switch and there are several sets of lead wires inside, which are changed by changing the number of turns around the early fan resistance. The rotation speeds of different gears, washing and dewatering functions of washing machines are mostly controlled by rotary switches.
2. Features
There are two types of rotary switch structures, MBB contact type and BBM contact type. The MBB contact type is in contact with the contact points before and after the transposition. When the transposition is to disconnect the front contact, maintain contact with the rear contact; and when the BBM contact type is transposition, the moving contact will be The front contact is disconnected and then the back contact is turned on. During the transition, the momentary state is disconnected from both the front and rear contacts.
Rotary switch analysis
1. The rotary switch itself has many uses. It can also be used as a substitute for some rotary pulse generators. It is mainly used in the front-end panel of the instrument and the man-machine interface of the audio/video control panel. Rotary switches use quadrature optical encoders instead of pure digital devices for analog potentiometers. It is similar in appearance to a conventional or resistive potentiometer, but its internal structure is fully digital and uses optical technology. 
2. Inside the rotary switch is also similar to the traditional incremental encoder, there are two orthogonal output signals, namely channel A and channel B, they can be directly connected with the encoder processing chip, the switch appearance is cylindrical. Around the "tube" out of the extension of the terminals, these terminals is the "tube" static contact extension, the static contact patch evenly distributed in the "tube", in the structure of a one-storey, thus Analogy, each layer is insulated from each other.
3. In the composition of the rotary switch, a rotating shaft is formed by rotating the top cover through the bottom to form a rotating handle, and the bottom plate and the top cover are clamped and fixed to form a switch assembly. In use, it can rotate 90 degrees, 180 degrees, or 360 degrees. Each time it rotates to a position, the movable contactor connects different static contacts, and different states can be output on the external terminals, thereby realizing control. 
Editor's summary: The above is about the use of rotary switches and structural features as well as the introduction and analysis of rotary switches. I hope that Xiaobian's sharing of these content will help everyone. For more information, please continue to pay attention to our website.
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