I. Common Winding Types for Relay Coils
Close-packed Single-layer Winding
Wound tightly turn by turn on small bobbins, ideal for low-power signal relays (such as smart socket control relays). It requires zero inter-turn overlapping and stable tension to ensure minimal DC resistance error.
Multi-layer Stepped Winding
To meet miniaturization demands, different layers adopt different turn counts or wire gauges in a stepped winding pattern, optimizing pull-in voltage and power consumption. Widely used in energy-saving relays for battery-powered devices.
Tap Winding
An intermediate tap is led out during the winding process, designed for dual-voltage or bistable relays. The production line must feature automatic tap generation and precise tap position recording functions.
Superior Resistance Consistency
The operating voltage of a relay coil is strongly correlated with its DC resistance. Automated lines deliver precise turn counting and tension control, keeping batch resistance deviation within a narrow range to prevent relay pull-in failure.
Auto Feeding & Soldering for Full-process Efficiency
Yite lines integrate automatic bobbin feeding, winding, tape wrapping, tap leading and wire cutting, and can be linked with automatic soldering machines to minimize manual handling and boost production yield.
Wide Compatibility with Various Bobbin Shapes
Relay coil bobbins come in round, square and irregular profiles. We provide modular tooling for quick changeover, perfectly meeting multi-variety small-batch production demands.
With over 20 years of winding expertise, Eternal has delivered automated production lines to numerous leading relay manufacturers. Our micro-fine wire processing equipment stably handles ultra-fine wire gauges, equipped with high-sensitivity wire breakage detection and tension memory functions.
For the high-volume characteristics of consumer electronics relays, we offer multi-station models with high daily output to meet mass production requirements. We also assist customers in optimizing coil parameters (turn count, wire gauge, layer count) to achieve rated pull-in force with minimum power consumption. We provide free process commissioning training and rapid after-sales response.
