What is the Halbach Permanent Magnet System?

Haziran 12, 2026

A Halbach array magnet system works in several situations, such as generating massive torque in small electric vehicle motors and levitating a maglev train above the tracks. It is known as the smartest magnet design that causes the magnetic field to be extremely enhanced on one side and almost disappear on the other side.

In the following, the working principle, advantages, and site for customized orders will be explained.

1. What is a Halbach Permanent Magnet System?

The Halbach Array is a special permanent arrangement of magnets, which was invented while studying particle accelerators by an American physicist, Klaus Halbach, in the 1980s. It works by arranging multiple magnets at a specific angle so that the magnetic field is concentrated on one side of the array while the magnetic field on the opposite side is reduced to nearly zero.

The magnetic field of an ordinary magnet radiates to both sides, which energy in one side is wasted. Halbach Array localizes all energy to the working side, and the strength can be two times higher. It is of great significance in engineering applications.

The initial design of Klaus Halbach is for generating a strong and uniform magnetic field in a particle accelerator, and guiding a charged particle beam. It is eventually used in electric vehicles, home audio systems, and cancer treatment equipment after decades.

2. The Principle of a Halbach Permanent Magnet System

Before understanding the working principle of the Halbach Permanent Magnet System, basic knowledge of ordinary magnet should be started with. There is a north pole and a south pole on a magnet, from which magnetic field lines originate from the north pole, loop through the outer space, and return to the south pole to form a symmetrical magnetic field. The magnetic field will radiate evenly to both sides if several magnets are put in a row.

The key to the Halbach Array is the rotation of the magnetization direction. The magnetization directions of adjacent magnets are not parallel in the array. Instead, they rotate by a fixed angle (usually 90 degrees) in sequence. They cause superimposition and enhancement of magnetic fields on the enhanced side and cancellation of magnetic fields on the weakened side.

It can be easier to understand the directional superposition of the magnetic field of the Halbach Array by imagining a row of people, in which each person holds a directional sign and rotates the sign 90 degrees compared to the person before. Their forces push and reinforce each other on the right side while canceling each other out on the left side.

3. What are the Advantages of a Halbach Permanent Magnet System?

The advantages can be understood in several aspects.

Enhancement of magnetic field:	The magnetic field strength on the working side of the Halbach Permanent Magnet System is about 1.4 to 2 times that of the ordinary array, using the same quantity and mass of magnetic materials. It indicates that the same performance can be achieved with less magnetic material, which reduces the material costs of rare-earth magnets.
Elimination of dorsal leakage of the magnetic field:	Dorsal leakage of the magnetic field causes waste and also causes interference to the surrounding environment. It can be a serious problem in electronic devices, medical instruments, or applications that require precise magnetic field control. There is almost no dorsal magnetic field in the Halbach Permanent Magnet System; no additional ferrous shielding materials are needed, and weight and size can be reduced.
Get closer to sinusoidal magnetic field distribution:	The ideal air-gap magnetic field should have a sinusoidal distribution in electrical engineering. The magnetic field distribution of the Halbach Permanent Magnet System is closer to a sinusoidal distribution, which can improve efficiency and reduce harmonic losses. Besides, there is research showing that a permanent magnet motor using a Halbach array has lower iron loss compared with the traditional design.
Reduce or eliminate the need for iron cores:	Traditional electric motors require a large amount of iron cores to guide the magnetic field, which is heavy and induces Eddy current loss during high speed spin. An ironless electric motor is possible in the Halbach Permanent Magnet System due to the strong magnetic field. The design can reduce weight and eliminate Eddy current loss, which is suitable for aerospace and electric vehicle applications that are weight-sensitive.

An obvious drawback of the Halbach Array is the repulsion and risk of demagnetization due to the arrangement of adjacent magnets. The magnetic fields of adjacent magnets try to demagnetize each other, which is more serious under high temperatures due to the thermal degradation of coercivity. On the other hand, the precise production of Halbach permanent magnet requires strict control on the direction of magnetization and assembly precision of each magnet, which results in higher manufacturing difficulty and cost.

4. Applications of a Halbach Permanent Magnet System

Electric vehicles and motors:	As an ideal magnet in High-Performance Permanent Magnet Synchronous Motor (PMSM), Halbach Permanent Magnet System is adopted in several electric vehicle models such as Tesla. It can achieve higher power density with the same volume and weight, and the advantage of lightweight is obvious in drone motors, which require an extremely high power-to-weight ratio.
Maglev:	The SCMaglev in Japan adopted the Halbach Permanent Magnet System to generate a levitation force for the train above the guide rail without affecting the non-working side of the guide rail. The maximum test speed of Maglev train has reached 603km/h and Halbach Permanent Magnet System is one of the key technologies.
Particle accelerator:	It is the original purpose of the invention. The periodic magnetic structure (Undulator) of Halbach Array generates high-intensity X-rays from an electron beam in a synchrotron radiation light source and free-electron laser, which is applied in materials science, biological structure analysis, and pharmaceutical research.
MRI medical imaging:	Permanent magnet MRI scanner adopts Halbach Array, which produces a uniform magnetic field of sufficient strength in an open space that can scan patients with claustrophobia. MRI scanner using the Halbach Permanent Magnet System do not require liquid Helium in cooling, so that the maintenance cost can be significantly reduced compared to MRI scanner using superconducting magnet.
Magnetic bearings:	Friction Force and wearing in a plain bearing are the main problems in high-speed rotating machinery. Magnetic bearings using Halbach Permanent Magnet System can allow suspension of a rotating component in the magnetic field that is contactless and frictionless. The revolutions per minute (RPM) can achieve tens of thousands in high speed, therefore it is widely used in vacuum pumps, flywheel energy storage systems, and gyroscopes.
Magnetic refrigeration:	This is an emerging application with potential. It is found that some materials will generate heat in a strong magnetic field due to the magnetocaloric effect and undergo cooling upon magnetic field removal. Strong and weak magnetic fields can be generated alternately during motion in the Halbach Array, which can drive a magnetocaloric refrigeration cycle without the requirement of a compressor and refrigerant.

The market demand for the Halbach Permanent Magnet System is growing rapidly due to the rapid adoption of electric vehicles and renewable energy. The global permanent magnet market is projected to grow from approximately $30 billion in 2024 to over $50 billion by 2023.

Asarepresentative of a high-performance magnetic system, the Halbach Permanent Magnet System will be one of the biggest beneficiaries of this growth. It is worth noting that 90% of neodymium magnet is produced in China, which indicates that the supply chain of Halbach Permanent Magnet System is concentrated in China, and has a significant impact on the procurement strategies.

5. Common Halbach Magnet Arrangements

Arrangement:	Description:	Widely used in:
Linear Halbach Array	It is the basic form with multiple magnets arranged in a straight line and a magnetic field concentrated in one single plane. The standard configuration is 4 or 5 magnets per cycle, with better magnetic field uniformity in 5 magnets per cycle.	Linear Motor, Maglev guide rail, electromagnetic lock
Circular / Ring Halbach Array	Magnets are arranged in a circle or ring, and the magnetic field is concentrated towards the inside or outside. The field inside type concentrates the magnetic field at the center of the circular ring, while the field outside type concentrates the magnetic field outside the ring.	MRI, magnetic bearing, rotor of rotating electrical machine
Multipole Halbach Array	The rotor magnet in a rotating motor is arranged into a multipole structure according to the Halbach Array. It is close to a sinusoidal air-gap magnetic field distribution, which can reduce harmonic distortion. The advantages of the Halbach Array are more obvious with a higher number of pole pairs.	High-end brushless motor
Double-sided Halbach Array	Two Halbach Array are arranged face to face and generate a strong and uniform magnetic field in the air gap between them .	Linear generator, magnetic coupler, high magnetic field scientific equipment

6. Factories that Can Customize Halbach Array Magnets

The production difficulty of Halbach Array magnets is much greater than that of ordinary magnets, in whichmagnetization direction accuracy and the assembly process of each magnet should be under strict control in the production of Halbach Array magnets. Here are a five factories that are capable of producing Halbach Array magnets.

HSMAGNET (China):	It specializes in high-performance permanent magnets and custom magnetic assemblies, with advanced magnetization technology and high-precision machining capabilities. It provides customized service of Halbach Array magnets for electric vehicle motor, robotics, automation, and scientific research applications.
Ningbo Newland Magnets (China):	It is one of the largest Neodymium magnet manufacturer in China, which is capable of mass production and precision customization. It can provide Halbach Array magnets using several magnet materials such as Nd FeB, SmCo, and AlNiCo, and custom-made different shapes according to drawings.
Stanford Magnets (USA):	It provides standard and customized products of Halbach Array magnets, with target client ranging from research institutions to industrial clients. It is suitable for North American and European buyers with strict document requirements, as it can provide a certificate of complete magnetic performance testing.
Arnold Magnetic Technologies (USA):	It is a magnet manufacturer with a history of over 100 years. It is experienced in producing high-performance permanent magnet parts, which are specially skilled in Halbach Array magnets applied in aerospace and defense applications.
Eclipse Magnetics (UK):	It is a famous manufacturer of magnets and magnetic systems in Europe, which provides industrial-grade Halbach Array magnets. It is specialized in industrial automation, magnetic separation, and medical equipment applications, and is suitable for European buyers.