Non inductive wirewound resistor is a resistor used to limit current flow. Its main feature is that it can provide stable resistance value without inductance. Non inductive wire wound resistors are usually composed of wire windings and terminals covered with insulating materials. The composition, characteristics, principle, classification, common faults and preventive measures of non inductive winding resistor will be introduced in detail below.
1、 Composition of non inductive winding resistor
Non inductive wound resistor is generally composed of wire winding and terminals.
1. Metal wire winding: The metal wire winding is the core part of the non inductive winding resistor. It is usually made of high conductivity alloy wires, such as copper, nickel and chromium. The resistance of the resistor is determined by the length and diameter of the wire winding. To improve DRV602PWR The power carrying capacity of the resistor. The metal wire winding usually increases the resistance value through multi-layer winding.
2. Insulation material coating: in order to prevent the wire winding from contacting with the external environment, the insulation material will be used to cover the wire winding. Common insulating materials include porcelain, ceramics, plastics, etc. The insulation performance and high temperature resistance shall be considered in the selection of insulation materials.
3. Terminal: the terminal is used to connect the non inductive winding resistor and the circuit. Common terminal forms include pin terminal, welding terminal, etc. Terminals are usually made of metal materials with high temperature resistance and good conductivity, such as copper, aluminum, etc.
2、 Features of non inductive wound resistor
The non inductive wound resistor has the following characteristics:
1. Non inductive: The winding structure of the non inductive winding resistor makes the current pass without inductance, which can accurately limit the current.
2. Stability: The resistance value of the non inductive wound resistor is stable, and will not drift significantly due to temperature changes or current changes.
3. High power carrying capacity: Due to the use of metal wire windings, the non inductive wound resistor has a high power carrying capacity.
4. High temperature resistance: Non inductive wound resistor usually adopts high-temperature resistant insulation materials and terminal materials, which can work normally under high temperature environment.
3、 Operating principle of non inductive winding resistor
The principle of inductance free wound resistor is based on Ohm's law, that is, the current is proportional to the resistance. When the current passes through the resistor, the wire winding will produce a resistance that blocks the current flow, limiting the current. Because of the winding structure of the non inductive wound resistor, the inductance will not be generated when the current passes through, thus ensuring the stability of the resistor.
4、 Classification of noninductive wound resistors
Non inductive wound resistors can be classified according to different classification standards. Common classifications are as follows:
1. Classification by power: according to the different power carrying capacity, non inductive wound resistor can be divided into low-power resistor, medium power resistor and high-power resistor.
2. Classification by resistance value: according to different resistance values, inductionless wound resistor can be divided into standard resistor and non-standard resistor. The resistance value of the standard resistor complies with the provisions of the International System of Resistance Units, while the resistance value of the non-standard resistor does not.
3. Classification by size: according to different sizes, non inductive wound resistors can be divided into small resistors, medium resistors and large resistors.
5、 Common Faults and Preventive Measures of Non inductive Winding Resistor
Some common faults, such as burnt, short circuit and open circuit, may occur during the use of non inductive wound resistor. In order to prevent these failures, the following preventive measures can be taken:
1. Reasonable selection of resistor: according to the requirements of the circuit, select the appropriate non inductive wound resistor, including power, resistance value and size.
2. Avoid overload use: avoid using the resistor beyond its rated power range to prevent overheating and burning of the resistor.
3. Humidity and corrosion prevention: The resistor should be placed in a dry and ventilated environment to avoid contact with harmful substances such as water, acid and alkali, so as to prevent the resistor from moisture and corrosion.
4. Pay attention to the temperature change: the resistor will produce certain heat when it works. Pay attention to prevent the temperature from being too high. The temperature can be controlled by cooling design or reducing the current.
5. Check the connection and welding: regularly check the connection between the resistor and the circuit to ensure that the connection is firm and that the welding points are free of faulty soldering, open soldering and other problems.
To sum up, the inductionless wound resistor is a resistor that can provide stable resistance value without inductance. It is composed of metal wire windings and terminals, and has the characteristics of non inductance, stability, high power carrying capacity and high temperature resistance. Non inductive wound resistors can be divided into different types according to different power, resistance value and size. In the process of use, attention should be paid to the prevention of common faults, including reasonable selection of resistors, avoidance of overload use, prevention of humidity and corrosion, attention to temperature changes, and inspection of connections and welding.
