The R core with no cutting ring section made of oriented high permeability silicon steel strip is a revolutionary breakthrough of transformer. Compared with El, C and ring transformers, it has higher performance and reliability. It has the characteristics of small size, light weight, high efficiency, minimum magnetic flux leakage, low temperature rise, no noise, and small excitation current. It is mainly used in photocopies, satellite broadcasting receivers, high fidelity sound amplifiers, measuring precision instruments and instruments, power equipment instruments, measuring instruments, medical instruments, industrial control equipment.