Inside Sunyung’s Zero-Magnetic Design
For mechanical watch collectors, magnetization is one of the most underestimated risks. A watch may look perfectly fine on the outside, yet its accuracy slowly drifts due to invisible magnetic interference.
Magnetization occurs when the balance spring inside a mechanical movement is affected by an external magnetic field. Even minor exposure can cause coils of the spring to stick together, leading to time deviation. Modern life is full of magnetic sources—phones, speakers, laptops, and unfortunately, low-quality watch winders.
Many inexpensive watch winders use standard DC motors without magnetic shielding. These motors are often positioned very close to the watch movement. When the winder operates for hours every day, the watch is constantly exposed to electromagnetic fields.
Sunyung addresses this issue at the engineering level. We use carefully selected low-magnetic Mabuchi motors, combined with multi-layer internal shielding and optimized motor placement. The magnetic field is isolated away from the watch position, ensuring long-term safety.
To verify this, we conduct real tests using compasses and professional Gauss meters. Even during continuous operation, magnetic readings remain stable and negligible.
For premium brands and serious collectors, magnet safety is not an optional feature—it is a basic requirement.