What are the main characteristics of aluminum shell resistors? What is the difference with ordinary resistance?

The main physical feature of aluminum shell resistance is to change electrical energy into heat energy. In other words, aluminum shell resistance is an energy-consuming element, through which the current will generate internal energy. The shell is made of aluminum alloy (golden aluminum shell), with heat dissipation groove on the surface, small size, large power, high temperature resistance, strong overload capacity, weather resistance, high accuracy, standard low induction resistance, high stability, strong structure, and good flexibility, multiple combination selection, which is conducive to mechanical protection and convenient for installation and use. This article has collected and collated some materials, hoping to be of great reference value to all readers.

Characteristics of aluminum shell resistance

1. Widely used: aluminum shell resistance is widely used in high demand electrical circuits such as power supply, frequency converter, elevator, crane, ship, servo, stage audio and numerical control equipment, and can work in the stubborn industrial control environment for a long time;

2. Advanced product, elegant shape: the metal shell of aluminum shell resistor is cut from advanced aluminum alloy materials, and the product is advanced; Through electroplating, it has strong anti-oxidation ability and elegant shape;

3. Small size and large power: because the aluminum shell has the characteristics of high temperature resistance and overload capacity, it can achieve the dual consequences of small size and large power, thus effectively saving the device space;

4. Convenient device: multiple wiring methods (lead type for small power, conductive bar or lead type for large power), convenient for device;

5. High safety: adopt flame-retardant inorganic materials and aluminum shell integrated packaging, with good seismic resistance, good insulation and high safety;

6. Good heat dissipation: the metal aluminum shell has heat dissipation grooves on the surface, which has good heat dissipation performance and is suitable for the heat dissipation plate device;

7. High accuracy and small error: the tolerance scale can be controlled within ± 1%~± 10%; Ship-type aluminum shell resistance.

Difference between aluminum shell resistance and common resistance

The aluminum shell resistance is the same as the ordinary resistance. In physics, the aluminum shell resistance represents the size of the resistance of the conductor to the current. The greater the resistance of the conductor, the greater the resistance of the conductor to the current. Different conductors have different resistance, which is a characteristic of the conductor itself. Resistance will lead to changes in the amount of electronic circulation. The smaller the resistance, the greater the amount of electronic circulation, and vice versa. The resistance value of aluminum shell resistance element is generally related to temperature, material, length, and cross-sectional area. The physical quantity to measure the influence of temperature on aluminum shell resistance is temperature coefficient, which is defined as the percentage of resistance change when the temperature rises by 1 ℃.

1. Selection of resistance value: in principle, the smaller the difference between the nominal resistance value of the resistor used and the required resistance value of the resistor, the better.

2. Error selection: the error of the resistor required for the time constant RC circuit should be as small as possible. Generally, it can be selected within 5%. For the decoupling circuit, the feedback circuit, the filter circuit and the load circuit, the error requirements are not too high. 10% - 20% resistors can be selected.

3. Rated voltage: when the actual voltage exceeds the rated voltage, even if the power requirements are met, the resistor will be damaged by breakdown.

4. Rated power: the rated power of the selected resistor should be more than twice the actual power to ensure the reliability of the resistor in the circuit for a long time.

We know that the use of aluminum in the inverter industry is generally used to make braking resistance, so it is also called braking resistance. Any large inertia system, variable-frequency motor deceleration time power supply, inverter power supply meeting, the increase of inverter DC voltage, when the voltage rises to a certain value, this period of time will be used for the released braking resistance, the energy generated by the movement in the form of heat, especially in frequent braking will consume a lot of energy, and the capacity of braking resistance will increase.