Inductors are widely used for protection of electric motors. They decrease current surges or spikes by temporarily storing energy in an electromagnetic field and then releasing it back into the circuit.
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For effective electromagnetic noise suppression in vehicle ignition systems, the KRAH Group offers a wide range of noise suppression resistors (NSR) with various types of terminals. In addition, it operates in the development and production of inductive coils that follow the most demanding standards in the automotive sector.
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Electric fans are used for engine cooling in vehicles. Given the adverse environmental conditions, solutions with resistors for speed control with one or more stages are a very good choice. Ceramic wire resistors are often used for this application. The product line of the KRAH Group also includes other technologies such as free spiral resistor or plate type resistors.
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For the speed control of fans in manual air conditioning (HVAC) systems, solutions with multi-stage resistors are robust and with technology approved by several vehicle manufacturers. The KRAH Group is the world market leader in this segment and will always offer you the most suitable solution, such as ceramic wire resistors or plate type resistors. Do you need electronic speed controls for your automatic air conditioning system? We will be happy to assist you in this development.
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Electromagnetic coils, unlike permanent magnets, have the ability to control the magnetic attraction exerted on another object. The security industry uses this characteristic of electromagnetic coils very effectively for the control of electromagnetic and electronic locks.
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Several household appliances use transformers, inductive coils and inductors, both white and brown line. In gas stoves, transformers are used in the ignition plants, in induction stoves electromagnetic coils induce the heating, and in hair dryers, washing machines, and dishwashers, inductive coils are used as stators for electric motors and water drain pumps, respectively.
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The electronic circuits have applications in several segments, such as audio, communication, switched sources, inverters, generation/storage/transmission of energy and industrial automation. To meet the growing demand for electronic components, KRAH uses technology for the development and manufacture of high-efficiency inductors and transformers.
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The power resistors of the KRAH Group continue to play a decisive role in the field of clean electric power generation technology. They are used in wind power generation, photovoltaic, transmission and conversion equipment and electricity storage; the latter is currently an increasingly requested requirement. Special requirements such as high voltage resistance, high energy absorption capacity or IP protection class are easily achieved by the resistor technologies available in the product portfolio. If a requirement cannot be met with a standard resistor, we will work with you to develop the correct solution. KRAH power resistors - your first choice for: filter systems, photovoltaic systems, UPS systems, wind farms, heat pumps.
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The continuous and rapid development of power electronics, which has lasted for decades, also requires new solutions in the field of power resistors. With a wide variety of resistor technologies, we'll find the right resistor in the KRAH portfolio for your DC link application, your charging unit, or your pre-charging or discharging application. For increased performance, air-cooled, forced-air-cooled, and liquid-cooled designs are available for maximum power requirements. As a reliable partner, the KRAH Group offers customized resistor solutions for the following applications: inverter/Frequency converter, rectifier, capacitors, servo controller.
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Mechanical engineering is an exciting market segment in which designers are challenged to increase productivity, improve efficiency, or optimize accuracy. With the support of simulation programs, KRAH application engineers can also develop the power resistor, optimally sized for their application, in order to safely and reliably meet the requirements defined for the braking resistors, filter or charge / discharge. The KRAH power resistors have proven their technical capability in: production machines, welding technology, tools.
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KRAH Group resistors will perform their tasks every day in an exemplary manner, either as a reliable braking resistor in an elevator, or as a reliable filter resistor in a medical device. The KRAH Group's resistors are used worldwide in process technology systems such as the chemical industry and in oil rigs where conditions can be very challenging. Our quality specifications, for example, QSV and zero defect strategy, offer solutions to the challenges of this equipment: platforms, medical technology, process engineering, roll-up doors, escalators and elevators.
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The use of photocells and LED technology has offered the possibility of efficient lighting at low cost, playing an important role in different segments, such as public lighting, civil construction, automotive and portable devices. KRAH offers the necessary products such as high quality relays, inductors and transformers to meet with the best efficiency the application in photocells and LED lamp drivers.
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Automation combines mechanical and electrical engineering to form efficient systems and plants. Whether for servo controllers, frequency converters or inverters, the KRAH Group power resistors are pulse-resistant and specially designed for use as braking or charging and unloading resistors. These resistors have been proven millions of times allowing your handling, robot, conveyor, and sorting systems to run smoothly and safely. KRAH power resistors are used in the following application areas: E-drives, conveyor systems, handling systems, robots, classification systems.
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A regular supply of goods requires highly available systems and equipment, both in procurement and production. The flow of goods is increasing and should reach the destination faster than ever before. As a result, infrastructure demands are also increasing, for example: higher speeds in transport systems that require more efficient braking resistors. The power resistors of the KRAH Group, particularly resistant to pulses, have been specially designed for use as braking, charging and unloading resistors. KRAH power resistors prove their value every day in these systems: Dynamic warehousing systems; forklifts, Transportation systems, cranes / hoists / overhead cranes, shipbuilding, railway engineering.
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Within e-mobility, powerful electric motors are used with intelligent systems managing the exchange of energy between the drive and the battery. The inrush current during the precharging of DC-link capacitors is controlled by KRAH's pre-charge resistors, which have been designed for high voltage requirements and are particularly impulse-load resistant. Contact us and we will accompany you in your project as a partner with automotive QSV standards and provide you with resistors according to the AEC Q-200 quality standard. We offer solutions for: pre and discharging of intermediate circuit capacitors. Voltage interruption and discharging in the event of a fault or crash.
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During braking operations of e-vehicles the regenerative behaviour of the electric motor generates energy which is recharged into the battery system. If the battery is already fully charged and can no longer absorb energy, the generated energy must be absorbed by other consumers. KRAH braking resistors are suitable for this purpose. The generated heat can then for instance be used to heat the vehicle interior. We will be happy to advise you on solutions with air or liquid cooled power resistors which are ideally suited for electric or hybrid vehicles: Brake resistors for recuperation operation. Brake resistors as electrical brakes.
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In charging the battery by an external power supply/grid, many electrical vehicles (BEV, PHEV) from cars up to floor-borne vehicles include an integrated charging circuit, which also realizes the pre- and discharge function of the DC-linked capacities. In this matter KRAH offers solutions for pre- and discharge functions based on resistors, optional extended to modules with integrated pre- and discharge relays.
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The coolant circuit is linked to the passenger compartment for heating purpose. For a rapid heating-up, KRAH offers additional heaters with high power, which will be direct placed in the fluid coolant. The geometries of these tubular heaters can be designed to the customer needs.
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