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potentiometer WTH118

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  • Freelancer
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    • Houston
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Potentiometer WTH118 22K slide along the resistance body, and lead to the input voltage moving contact component brush or contact into the brush is divided into two categories: one is the metal brush. That is, the brush made of metal materials; The other is the carbon brush, which is made of mixed materials such as carbon and tree fingers. The shapes of metal brushes are brush, dot, spherical and 'multi - finger'. In order to ensure the contact reliability and uniform current distribution, multi-finger brush is the best. The shape of the carbon brush is conical and rectangular, and the contact surface is flat and spherical. The contact reliability, low noise, mechanical durability and service life of the WTH118 33K potentiometer are directly related to the contact state and mechanical wear of the brush resistance body. Therefore, brush material should have corrosion resistance, oxidation resistance, heat resistance, cold resistance; Good thermal conductivity, good electrical conductivity, no magnetic, low contact resistance, high wear resistance and good mechanical strength.

Brush and resistance body are always in contact and friction state, the two materials of potentiometer WTH118 15K should be matched and combined properly, so as to obtain small contact resistance and good wear resistance. One of the two can wear out quickly if not properly combined. Compared with the resistance body, the hardness and wear resistance of the brush should be slightly lower, so that the resistance body from damage, to ensure its reliability. When choosing carbon brush, the WTH118 10K potentiometer resistance value of carbon brush is much larger than that of metal brush, so the output influence of potentiometer WTH118 6K8 is larger. The resistance of the brush is lower than the carbon black and graphite content in the formula. High carbon content, low resistance, but poor strength. Metal powder (such as silver powder) is sometimes added to reduce resistance for demanding brushes. The resistance of the carbon brush is as small as possible, generally no more than 6 ohms with potentiometer WTH118 5K6. The strength of the brush refers to the maximum pressure the brush can withstand. High strength can withstand the pressure is large, so that the contact resistance with the resistance body is small.

The brush that does with metal material, should have higher tensile strength and better elongation, and easy to weld, facilitate processing and assembly. Metal brush should be selected with good elastic metal material, so that the brush moving contact has a certain elastic pressure on the resistance body of potentiometer WTH118 5K1. Elastic materials should have higher elastic limit, yield limit and so on. In long-term use, the less the elastic pressure change of the brush, the higher the contact reliability. Potentiometer WTH118 4K7 metal brush commonly used materials are: beryllium bronze, phosphor bronze, zinc white copper, silver chromium alloy, platinum nickel alloy, platinum iridium alloy, pound iridium alloy, gold silver copper alloy. Alloys based on precious metals have high oxidation and corrosion resistance, even under high temperature and humidity conditions. When the stability; Contact resistance changes very little and is often used for precision potentiometers WTH118 3K3. The sliding arm is connected with the rotating shaft (or handle) and brush components, it will rotate the shaft (or handle) movement of the rotating shaft brush, drive the brush on the resistance body sliding body sliding arm material according to WTH118 2K2 potentiometer structure selection of metal materials or non-metallic materials.

If elastic metal materials are selected, the sliding arm exerts elastic pressure on the brush, if rigid material is used, the brush should have some elasticity, or another elastic part to apply elastic pressure on the brush. Commonly used as sliding arm materials are cloth hinge, paper glue board, plastic, brass, silver copper and phosphor bronze. Potentiometer WTH118 1K metal materials generally need to electroplate protective layer. The contact reed is a groove connecting the brush and the collector, which transmits the electrical output of the brush to the collector and the lead. The connection between the contact reed and the potentiometer WTH118 470R collector is a kind of moving contact, so the contact reed has great influence on the mechanical durability, contact stability and dynamic noise of potentiometer WTH118 680R. Therefore, the contact reed should have good elasticity to ensure a certain elastic pressure on the flow collector; It also has good electrical conductivity and thermal conductivity, and its hardness and wear resistance should match the flow collector. The commonly used materials are phosphor bronze and by bronze. Contact reeds are often integrated with brushes or sliding arms.


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