As the core energy conversion component of internal combustion engine ignition systems, ignition coils convert low-voltage to high-voltage electricity, directly affecting engine start-up efficiency, power output and fuel economy. Axis (xi'an) Technology Co., Ltd ("Axis" for short), relying on ISO9001 system and electronic component expertise, develops ignition coils for various engines, serving automotive and construction machinery industries. This article analyzes its definition, functions, structure and types to facilitate accurate selection.
Core Definition and Functions of Ignition Coils
An ignition coil is essentially a pulse transformer, realizing voltage step-up via turn ratio difference between primary and secondary coils based on electromagnetic induction. It receives 12V/24V from the battery, generates magnetic field through the primary coil; when the ignition controller cuts off current, the magnetic field changes suddenly, inducing 15000V-40000V high voltage in the secondary coil, which creates sparks via spark plugs to ignite the mixture and drive the engine.
High-quality ignition coils require stable insulation, anti-interference and -40℃~120℃ temperature adaptability. Axis products pass 1000-hour high-low temperature cycle and vibration tests, maintaining stable voltage output in extreme environments with ignition efficiency 15% higher than industry average.
Precision Structural Composition of Ignition Coils
Ignition coil structure balances efficiency and reliability, with core components as follows:
1. Coil Assembly: Core of energy conversion, primary (100-300 turns) and secondary (10000-30000 turns) coils wound with thick/thin enameled wire. Axis uses oxygen-free copper wire with ±0.01mm tolerance, automated winding reduces magnetic leakage.
2. Iron Core: Laminated silicon steel sheets enhance magnetic flux. Axis selects 3.5%-4.5% high-silicon sheets, with 20% higher permeability after vacuum annealing to reduce iron loss.
3. Insulating Shell & Filler: High-temperature resistant PBT+GF30 shell, internal epoxy resin vacuum potted. Axis uses imported epoxy resin with breakdown voltage ≥25kV/mm for insulation safety.
4. Ignition Controller: Built-in automotive-grade chip receives ECU signals to control current. Axis self-developed controller has ≤1μs response time and ±0.5°CA ignition timing accuracy.
5. High-Voltage Output Terminal: Nickel-plated brass, equipped with damping wire or spark plug connector, reducing contact resistance and corrosion risk.
Main Types and Application Scenarios of Ignition Coils
Classified by structure and application, ignition coils mainly include the following types for different needs:
6. Open Magnetic Circuit Ignition Coil: Strip core with incomplete magnetic circuit, 60%-70% efficiency, large volume, for old carburetor engines and small machinery. Axis economical version reduces cost by 10% for basic needs.
7. Closed Magnetic Circuit Ignition Coil: "Ri"/"Kou" shaped core with closed magnetic circuit, ≥80% efficiency, small size, mainstream for automobiles. Axis integrated product is 30% lighter, compatible with Toyota/Volkswagen, passing IATF16949 certification.
8. Independent Ignition Coil: One per cylinder, no high-voltage wire, high ignition accuracy, for mid-to-high-end cars and turbo engines. Axis products support CAN communication, compatible with start-stop and direct injection.
9. Integrated Ignition Coil Module: Multi-cylinder coils share controller, compact structure, for multi-cylinder and hybrid vehicles. Axis modular design avoids single-cylinder failure affecting the whole.
10. Special Ignition Coil: For gas and construction machinery engines, Axis optimizes formula to increase ignition energy to 120mJ, compatible with 1000rpm-6000rpm wide speed range.
Axis, as one of the most professional ignition coil manufacturers in China, specializes in leveraging superior engineering expertise and a robust global supply chain to deliver high-performance ignition coil solutions for automotive parts distributors, OEM suppliers, and repair service providers. We adhere strictly to international quality standards such as ISO/TS 16949, ensuring industry-leading durability, reliability, and compatibility.
Axis has full-process R&D and production capabilities for ignition coils, with products passing CE, UL certifications and supporting customization. For technical parameters, adaptation solutions or samples, visit www.axisrubber.com or contact the technical team.
