Why Choose Tiangeng
Professional Production
We are a company specializing in the design, development, and production of precision series resistors, precision sampling resistors, precision shunts, precision resistor dividers, non-inductive resistors, and power resistor.
Strict Management System
We implement a high-tech enterprise quality management system and strictly follow ISO9001 service management standards and work processes. We will establish detailed product files for customers, respond to customer service requests on time, and assist customers in solving problems.
Advanced Equipment
We have advanced production equipment, such as precision photolithography machines, high and low temperature testing equipment, Agilent 3458A and other precision instruments, digital high-resistance calibrators, high-temperature sintering equipment, heat treatment equipment, etc.
Wide Application
The products produced are widely used in sensors, scales, rail transit, ships, new energy, precision automation control, power instruments, medical equipment, power automation control, precision instruments, measuring instruments, automobiles, electromechanical railways, communications and other fields.
A non-inductive resistance is a resistance which has no inductance (no opposition to changes in current flowing through it). Such resistance is important at high (radio) frequencies, as well as in high-speed logic (digital) circuits. Since most standard through-hole resistors have the resistive element (wire or film) placed on them in the form of windings, and these windings act as a coil of wire, they would have a certain amount of inductance in them, just like an inductor/coil of the same dimensions and same number of turns.
While these resistors cause no problems at lower (such as audio) frequencies, at much higher frequencies their inductive component becomes a significant part of the overall resistance (now called impedance, which includes the ohmic resistance, capacitive reactance and inductive reactance, and which is the total complex resistance of an element or a circuit at a certain frequency).
Carbon Composition
Composition means that the resistive material is a mix of carbon and stabilizing compounds. The amount of carbon in the mix determines the resistance of the material. A small cylinder, like a pencil lead, is held between the two electrodes and coated with resin or phenolic, making a non-inductive resistor with low LS that is often used in RF circuits.
Film Resistors
In a film resistor, the resistive material is a very thin coating of carbon or metal on an insulating substrate, such as ceramic or glass. The value of the resistance is determined by the thickness of the film and the amount of carbon or metal in it. These resistors are available with very accurate and stable values.
Wirewound
Common in power supplies and other equipment where lots of power is dissipated, a wirewound resistor is made just as you might expect. A high-resistance wire is wound on an insulating form — usually a ceramic tube — and attached to electrodes at each end. These are made to dissipate a lot of power in sizes from one-watt to hundreds of watts!
Ceramic and Metal Oxide
If you need a high-power non-inductive resistor, you can use cermet (ceramic-metal mix) or metal oxide resistors. These are constructed much like a carbon comp resistor, substituting the cermet or metal oxide for the carbon composition material.
Adjustable Resistors
There are many different types of adjustable resistors. The simplest are wirewound resistors with some of the wire exposed so that a movable electrode can be attached. The most common are adjusted with a rotary shaft.
Wire Materials of Non-Inductive Power Resistor
Wirewound resistors are mainly produced with alloys, since pure metals have a high temperature coefficient of resistance (TCR). However, for high temperatures, pure metals such as tungsten are often used. The temperature coefficient is a measure of how much the resistance will change as the temperature changes. TCR is measured in units of ppm/˚C. If a manufacturer rates a resistor at 50 ppm/˚C, the resistor will not change more than 50 Ω in resistance for each 1 MΩ of the resistors given value, for a temperature change of 1 ˚C. Typical alloys that are used as resistor wire are:
Copper alloys
Silver alloys
Nickel chromium alloys
Iron chromium alloys
Iron chromium aluminum alloys
How to Measure Non-Inductive Resistance?
How to distinguish whether it is a non-inductive resistor or not, you can measure the resistor under the condition of direct current and alternating current to see if its resistance value is equal. If the resistance value is equal, it is a non-inductive resistor. At present, there are mainly the following methods for measuring resistance:
Direct Method
The method of measuring resistance with a direct-reading instrument such as the ohm range of a multimeter is called the direct method.
Comparison Method
The method of measuring resistance with a comparison instrument such as a DC bridge is called the comparison method.
Indirect Method
The method of first measuring the quantity related to the resistance and then calculating the measured resistance through the relevant formula is called the indirect method. A common example is voltammetry to measure resistance.
Major Features of Non-Inductive Power Resistor
Non-Inductive
Non-inductive power resistors are specifically designed to minimize or eliminate inductance. Inductance can be a significant issue in certain applications, particularly in high-frequency circuits or when dealing with reactive components. Non-inductive resistors ensure that the resistor does not behave like an inductor and affect the performance of the circuit.
High Power Handling
Non-inductive power resistors are built to handle higher power levels compared to standard resistors. They are designed to dissipate more heat and typically have a larger physical size to accommodate this capability. This makes them suitable for use in high-power applications such as power supplies, amplifiers, motor control systems, and industrial equipment.
Low Temperature Coefficient
Another important feature of non-inductive power resistors is their low temperature coefficient. This refers to the degree to which the resistance changes with temperature. Non-inductive resistors are designed to have a stable resistance value over a wide range of temperatures, minimizing the impact of temperature variations on the circuit performance.
Thick Film or Wirewound Construction
Non-inductive power resistors are usually constructed using either thick film or wirewound technology. Thick film resistors use a resistive material deposited on a ceramic substrate, while wirewound resistors are made by winding a resistance wire around a core. Both of these construction methods provide low inductance and high power handling capabilities.
High Voltage Rating
Non-inductive power resistors are designed to withstand high voltage levels. They have appropriate insulation and spacing between terminals to prevent voltage breakdown and ensure safe operation at elevated voltages. This makes them suitable for use in high-voltage applications such as power distribution systems, electrical grids, and electronic equipment with high voltage requirements.
Non-inductive power resistors are designed to withstand high voltage levels. They have appropriate insulation and spacing between terminals to prevent voltage breakdown and ensure safe operation at elevated voltages. This makes them suitable for use in high-voltage applications such as power distribution systems, electrical grids, and electronic equipment with high voltage requirements.
Applications of Non-Inductive Power Resistor
Energy Conversion Systems
Non-inductive power resistors are used in energy conversion systems such as inverters, rectifiers, and power supplies. These resistors help to control voltage, limit current, and dissipate excess power that may be generated during energy conversion processes.
Industrial Machinery
Non-inductive resistors are used in industrial machinery and equipment that require precise control of electrical currents. These resistors help to regulate the flow of electricity, prevent voltage spikes, and protect sensitive components.
Load Banks
Non-inductive power resistors are used in load banks to simulate electrical loads for testing and commissioning of generators, transformers, and other power distribution systems. These resistors can dissipate high power levels without creating inductive effects, ensuring accurate load representation.
Power Distribution Systems
Non-inductive resistors are employed in high-power electrical applications, such as power distribution systems and transmission lines. They help to regulate voltage levels, improve power quality, and provide surge protection by dissipating excess power in a controlled manner.
Braking Systems
Non-inductive power resistors are used in dynamic braking systems, which convert the kinetic energy of moving machinery into electrical energy. These resistors help to absorb and dissipate the excess energy, preventing equipment damage and enabling smooth deceleration.
Research and Testing
Non-inductive resistors are used in research laboratories and testing facilities where accurate and stable resistance values are required. They play a crucial role in calibrating and verifying measurement instruments, testing electronic components, and conducting experiments involving high power dissipation.
Inductive vs. Non-Inductive Resistors
The induction of a resistor is a very important item to keep in mind when building a circuit, especially if you are dealing with switching or high frequency circuits. The construction of most resistors are very similar to that of an inductor. They take a specific length of wire or film, determined by the resistance value they are trying to achieve, and wrap it around a core made of ceramic, plastic, fiberglass, or another non-conductive material. A non-inductive resistor is wound one way then again in the other direction. This will cancel out the magnetic fields generated by each of the wires.
Most resistors are created in this same manner but with different materials. For example, film based resistors are using film instead of wire which has proved to be more precise. Ceramic and carbon composition, not to be confused with carbon film, are naturally non-inductive because they don't have any windings.
A non-inductive resistor can be used to replace an inductive resistor, but that might not be a realistic goal. Inductive resistors are typically cheaper to construct and are more commonly made with higher power ratings.
DC circuits don't have to worry about the inductance of a resistor since there isn't any fluctuation in the current to create the altering magnetic fields.
Manufacturing Process of Non-Inductive Power Resistor
Material Selection:
Choose a resistive material with low inductance properties, often made of ceramic, wire-wound, or metal film.
Substrate Preparation:
Start with a ceramic substrate, which provides stability and thermal conductivity. Apply a thin insulating layer to prevent electrical short circuits.
Marking and Labeling:
Mark the resistor with its resistance value, tolerance, and other relevant information. This step ensures proper identification during installation.
Encapsulation:
Encapsulate the resistor assembly in a protective coating or housing. This coating provides insulation, protects against environmental factors, and enhances heat dissipation.
Termination and Connection:
Attach metallic end caps or terminations to the substrate. Connect the resistive element to these terminations, ensuring a secure and low-inductance connection.
Quality Control:
Implement quality control measures throughout the manufacturing process to ensure consistency and reliability.
Testing:
Conduct thorough electrical testing to verify the resistor's resistance, tolerance, and non-inductive characteristics. Evaluate heat dissipation and thermal stability.
Resistive Element Application:
Apply the chosen resistive material onto the substrate. For wire-wound resistors, wind a resistive wire around the substrate.
Packaging:
Package the resistors in suitable materials, providing protection during shipping and storage
Resistor Precautions in Usage
When an ambient temperature exceeds a rated ambient temperature, resistors shall be applied on the derating curve by derating the load power.
Generally resistors are not combustion- resistant and are likely to emit, flame, gas, smoke, red heat, etc. under overloads.
Flame retardant resistors generally emit smoke and red heat in a certain power and over but do not emit fire or flame.
When resistors are shielded or coated with resin etc., stress from the storage heat and the resin are applied to the resistors.
Performance and reliability of resistors should be checked well before use.
When a voltage higher than rated is applied in a short time (single pulse, repeated pulses, surge, etc.), it does not necessarily ensure safety that an effective wattage is not higher than a rated wattage. Then consult with us with your specified pulse wave shape. Resistors shall be used in a condition causing no dew condensation.
Keep temperature from rising by choosing resistors with a higher rated capacity; do not use a component having the exact load value required.
For considerations of safety in extended period applications, the rating should be more than four times higher than the actual wattage involved, but never use resistors at less than 25% of its rated power.
In applications where resistors are subject to intermittent current surges and spikes, be sure in advance that the components selected are capable of withstanding brief durations of increased load.
Do not exceed the recommended rated load. Resistors must used within the rated voltage range to prevent the shortening of service life and/or failure of the wound resistance elements.
Our Factory
Based on many years of producing various precision resistors, our company designs, develops, and produces various resistor cabinets, coaxial resistors, and metal foil standard resistors.
Company Honor
Based on the high-tech enterprise quality management system, we strictly follow ISO9001 service management standards and work processes.
Frequently Asked Questions
We're well-known as one of the leading non-inductive power resistor manufacturers and suppliers in China. If you're going to buy or wholesale high quality non-inductive power resistor made in China, welcome to get more information from our factory.
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