Halbach Array Magnet Neodymium Magnets Halbach Arrays

$5.00
Halbach Array is most commonly used to produce a magnetic field utilizing permanent magnets arranged in a 90° orientation change between magnetic elements, which amplifies the magnetic force.

Lorderan produces high performance custom halbach arrays for a multitude of applications including Maglev, and electron beam manipulation.

If you have a question about your application, please contact us to speak with a magnet specialist.
$5.00
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A Halbach array is a special arrangement of permanent magnets that augments the magnetic field on the one side of the array while cancelling the field to near zero on the other side. We mainly make linear halbach arrays and Halbach Cylinder

Halbach Array

A Halbach array is a special arrangement of permanent magnets that augments the magnetic field on one side of the array while cancelling the field to near zero on the other side. This is achieved by having a spatially rotating pattern of magnetisation.

Large and uniform magnetic field will be produced by halbacharray in a certain area, and its magnetic field can also exceed the remanence of the magnetic material itself.

Linear Halbach arrays

This device is also a key component of the Inductrack Maglev train and Inductrack rocket launch system. Wherein the Halbach array repels loops of wire that form the track after the train has been accelerated to a speed able to lift.

The simplest example of a one sided flux magnet is a refrigerator magnet.

Halbach cylinder

A Halbach cylinder is a magnetized cylinder composed of ferromagnetic material producing (in the idealized case) an intense magnetic field confined entirely within the cylinder with zero field outside. The cylinders can also be magnetized such that the magnetic field is entirely outside the cylinder, with zero field inside.

These cylindrical structures are used in devices such as brushless AC motors, magnetic couplings and high field cylinders.

1. Materials

Magnet: Neodymium Magnet

Hardware part: 10# or 20# steel, martensitic stainless steel

2. Application

Linear Halbach arrays:

Such as the brushless AC motor, voice coils, magnetic drug targeting to high-tech applications such as wiggler magnets which are used in Particle acceleratorsand Free-electron lasers.

Halbach cylinder:

Such as brushless AC motors, magnetic couplings and high field cylinders. Both brushless motors and coupling devices use multipole field arrangements.

Where are Halbach Arrays Actually Used?

Halbach Array is most commonly used to produce a magnetic field utilizing permanent magnets arranged in a 90° orientation change between magnetic elements, which amplifies the magnetic force. Halbach Arrays can also be configured in other shapes. A halbach array ring magnet with multi-pole magnetization or a ring made up of smaller arc segments can be used in this way.

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Q. What is a duty cycle?
A. Duty cycle is defined as (time on) / (time on + time off) per cycle. A lower duty cycle allows the motor to be run with as much as three times its continuous current rating for a short time period to produce higher forces than if the motor runs continuously.

Q. Do standard rotary motor electronics work with linear motors?
A. Lorderan' linear motors are designed to operate with most off-the-shelf controls and drives. Basically, linear motors use the same electric circuit as rotary motors. This applies to stepper, brush and brushless, and AC linear motors alike.

Q. Can a linear motor be mounted vertically or horizontally?
A. Yes. A linear motor provides the same performance when mounted vertically, upside down, or horizontally. However, a vertically-mounted linear motors must be counterbalanced.

Q. Can more than one stepper motor forcer be mounted on a stepper motor platen?
A. Yes, multiple forcers that move independently may be mounted on one platen, as long as they do not physically interfere with each other.

Q. Can more than one brushless linear motor moving coil (primary) assembly be used with a single magnet assembly (secondary)?
A. Yes, more than one coil assembly can be used in conjunction with a single magnet assembly as long as the coil assemblies do not physically interfere with each other.

Q. Does Lorderan make speciality motors for waterproof, vacuum, or clean room environments?
A. Yes, linear motors can be built for a variety of operating environments. To determine if a linear motors is suitable for a specific application, an applications engineer must review the application specifications.

Q. What types of linear motors does Lorderan make?
A. We offer of the broadest lines of linear motors in the industry, so customers are assured they get the best linear motor solution for their application. Our product line includes single-, and dual-axis linear steppers, single- and double-sided linear brushless and brush motors, non-commutated DC motors, enclosed positioning stages, single and cross roller bearing positioning stages, AC linear induction motors, polynoid linear actuators and position verification sensors. Also, new concepts in linear motion technology are continuously being introduced.

Q. Does Lorderan make solenoids?
A. Lorderan makes a polynoid AC linear motor and a non-commutated DC linear motor, both of which are similar to solenoids. The polynoid provides long stroke with constant force is both directions. (With a solenoid, force is only applied in one direction). Travels are only limited by end stops on the support rod. The non-commutated DC linear motor provides short stroke, up to 5 inches, with constant force in both directions.

Q. What are the advantages of a moving magnet actuator over a solenoid?
A. A moving magnet actuator is a DC motor which can be operated as a servo. This allows the device to move with extreme accuracy to any position throughout its entire stroke. The moving magnet actuator is well-suited for short stroke applications.

Q. What are the advantages of a linear motor over a lead screw?
A. The advantages of linear motors include higher velocities [>80 in/sec (>2 m/s)], non-wear moving part, free movement when power is off, no backlash because there are no mechanical linkages.

Q. What are the minimum and maximum sizes of linear motors?
A. Lorderan' linear motors are available in a variety of shapes and sizes beginning with 1/4" diameter. If a standard motor won't meet a customer's specific requirements, a custom motor can be built for the application.

Q. What type of feedback devices are available?
A. Feedback devices are not included with standard motors. However, a position verification sensor is offered for single and dual axis linear stepper motors and optical encoders are offered for closed-loop positioning systems.

Q. What happens if the system loses power of velocity feedback?
A. If a power loss occurs, the system loses all stiffness. So, if the payload is moving, it will continue to move until it hits a stop or until friction brings it to a stop. If the system is already stopped, it will not be affected. If the feedback loop is lost, it may lead to a runaway situation. This condition can be avoided with the use of soft and hard stops as well as braking systems.

Q. Do magnets ever lose their magnetism over time?
A. Lorderan' linear motors use rare earth magnets, which maintain their strength over time. However, when operating at high temperatures (>150°C), rare earth magnets can lose strength.

Q. What is cogging?
A. Cogging is a tendency of some linear motors to move in discrete distances rather than infinitely variable distances. The effect is a result of varying magnetic forces along the length of the motor.

Q. Does Lorderan offer full motion control solutions?
A. Yes, Lorderan can provide you with a full motion control solution including motor, bearing, amplifier, and motion controller.
Halbach Array Magnet Neodymium Magnets Halbach Arrays
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