soft magnetic materials for motor lamination

Soft Magnetic Materials for Motor Lamination

Soft magnetic materials play a crucial role in motor lamination stacks. These materials are defined by their ability to be magnetized with a coercivity (Hc) of less than 1000A/m. They achieve maximum magnetization intensity with a minimal external magnetic field. This makes them ideal for applications requiring efficient magnetic performance. This blog will explore various soft magnetic materials and their characteristics, focusing on their use in motor laminations.

Key Soft Magnetic Alloys


Characteristics: 1J22 is an iron-cobalt alloy known for its high saturation magnetic flux density of 2.4T. It has a high Curie temperature of 980°C and the largest saturation magnetostriction coefficient (60~100×10⁻⁶). However, it has a low resistivity (0.27µΩ·m), making it less suitable for high-frequency applications.

Applications: Motor lamination for drones and mower machines; Transformer core lamination


Characteristics: 1J27 features a high magnetic flux density of 2.36T and a high Curie temperature. It offers good mechanical toughness and ductility, with better air permeability than 1J22, and does not exhibit brittleness.

Applications: Motor core lamination; Transformer lamination


Characteristics: 1J50 is known for its high saturation magnetic flux density (1.5T) and high magnetic permeability. It also has good corrosion resistance.

Applications: Transformer cores for electronic devices, communication equipment, and medical equipment


Characteristics: 1J85 has very high magnetic permeability, with a relative magnetic permeability greater than 100,000 and low coercivity (1.2A/m). It is significantly affected by stress.

Applications: Transformer core

Carpenter Hiperco 50

Characteristics: Hiperco 50 is notable for its high magnetic saturation (24 kilogauss) and high DC maximum permeability. It has low DC coercive force and low AC core loss.

Applications: Rotor and stator laminations in motors and generators for aircraft power generation

Hiperco 27

Characteristics: Hiperco 27 offers high saturation and a high Curie temperature. It has lower permeability but the highest degree of ductility and toughness.

Applications: Motor lamination for aerospace and consumer applications

Hypocore Soft-Magnetic Alloy

Characteristics: This alloy is characterized by low coercivity, high permeability, and high electrical resistivity.

Applications: Electric motor lamination; Generator magnetic core; Transformer core; EM laminated-core

Vacodur 49

Characteristics: Vacodur 49 provides high magnetic saturation up to 2.3T and low coercivity down to 35A/m. It also boasts very high yield strength up to 800MPa.

Applications: High flux density and minimum weight applications in motor and generator laminations


Soft magnetic materials are essential for efficient motor lamination, offering low coercivity and high magnetic permeability. Each material has unique properties that suit specific applications, from drones and mowers to aircraft power generation. By understanding these characteristics, manufacturers can choose the most appropriate material for their needs, enhancing performance and efficiency in various applications.

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