Product introduction

Permalloy toroidal cores are closed-loop magnetic cores manufactured by winding Permalloy strips and subsequently hydrogen annealing them. Featuring high magnetic permeability, low coercivity, low core loss, and a gapless magnetic circuit, they are ideal core solutions for precision transformers, instrument transformers, chokes, and various electromagnetic devices. Our Permalloy toroidal cores are available in two material series: 80% Nickel (typical grades 1J79/1J85) and 48~50% Nickel (typical grades 1J50). Custom outer diameters, inner diameters, heights, and strip thicknesses are available upon request. Our products are widely used in audio equipment, telecommunications, power protection, instrumentation, and other fields.

KEY FEATURES:

• High initial permeability (especially for 80% Ni), offering sensitive response to small signals and enabling reduced coil turns with simplified transformer winding processes;

• Low coercivity and low hysteresis loss, effectively reducing core loss and improving device efficiency;

• Near-zero magnetostriction for high-nickel (80% Ni) material, ensuring excellent dimensional stability during magnetization, suitable for audio signal transmission;

• Closed gapless magnetic circuit with extremely low reluctance and minimal flux leakage, maximizing magnetic performance utilization;

• Hydrogen annealing eliminates winding and processing stresses, ensuring stable and reliable magnetic performance with low degradation over long-term use;

• Toroidal structure provides uniform magnetic field distribution with no localized saturation, offering excellent consistency for batch production.

TYPICAL APPLICATIONS:

• Audio transformer and input/output transformer cores, for high-fidelity audio equipment, microphone preamplifiers, and communication devices, enhancing detail reproduction and high-frequency performance;

• Precision current transformers and instrument transformer cores, for power measurement, instrumentation, and energy metering applications;

• Common-mode chokes and EMI filter inductor cores, for common-mode interference suppression in switching power supplies, power filters, and EMC designs;

• Pulse transformer and driver transformer cores, for high-frequency switching circuits, drive circuits, and industrial control equipment;

• Ground fault interrupter and zero-sequence current transformer cores, for power protection and safety control systems.

Product type

Toroidal Cores

Product specification model

Customizable according to requirements