Torque Of Magnetic Coupling Research Articles

TRANSMISSION TORQUE OF A STANDART MAGNETIC COUPLING DEPENDING ON THE PERMANENT MAGNET BRAND AND ITS SHAPE WITH GAP BETWEEN THE MAGNETS OF 5 MM

The article considers the possibility of changing the transmitting torque of a cylindrical magnetic coupling depending on the brand of a highly coercive permanent magnet: neodymium–iron–boron, samarium–cobalt and barium hexaferrite types Using the example of a standard magnetic coupling with a magnets diameter of 120 mm and an air gap of 5 mm between the magnetic coupling halves, the change in the transmitting torque of the magnetic coupling is shown to attain without changing its overall dimensions. Variation in the transmission torque of the magnetic coupling is possible by changing the shape, size and brand of permanent magnets, while leaving the same number of magnets in each of the half-coupling.

Dynamic Characteristics of Magnetic Coupling in Horizontal Axis Wave Energy Device

Abstract To solve the dynamic response problems of magnetic coupling in the horizontal axis wave energy device, this has researched the dynamic characteristicsof magnetic coupling. The fitting formula about torque and angle of the magnetic coupling is obtained through experiments. The mathematical models of the magnetic coupling torque transmission are established. The steady state error of the magnetic coupling and the transfer function of the output angle are obtained. The analytical solution of the step response of the output angle in time domain is derived. The influence of the torsional rigidity, the damping coefficient and the driven rotor’s rotational inertia on dynamic characteristics of the magnetic coupling isanalyzed. According to the analysis results, the design rules of magnetic coupling are proposed.

Calculation and Analysis of Drive Torque of Axial Magnetic Drive Mechanism

The magnetic circuit parameter design problem was proposed aiming at axial magnetic drive mechanism driving torque. Analyzed axial magnetic drive mechanism driving principle .According to the mathematics model of the magnetic coupling torque that was established based on the equivalent magnetic charge theory, analyzed magnetic circuit design, included material selection, magnetic circuit type, the working air gap of magnetic circuit, magnet and the thickness of the magnets and resistive magnets. The basis was provided for the rational design of high-performance axial magnetic drive mechanism.

Study on the Eddy Current Loss Characteristic of the Coaxial Cylinder Style Magnetic Coupler

This paper analyzed the eddy characteristics of the coaxial cylindrical magnetic coupler by using the finite element method, and simulated the impact of eddy currents on magnetic field. These effects mainly reflected in: weakening the magnetic coupling of the magnetic field intensity, and reducing the magnetic coupling torque. In addition, this paper calculated eddy current power loss, and proposed specific programs to reduce the eddy current power loss.

Simulation study of the magnetic coupling between radial magnetic gears

The torque of magnetic coupling with different magnetic poles has been investigated by theoretical computations with two dimensional modeling processes of finite element analysis. The torque is sensitive to the number of magnetic poles, the material of the magnetic gears, and the distance between the magnetic gears. For a 2 mm separation distance of two magnetic gears with 20 mm radius, the maximum torque occurs between 6 and 20 poles which is dependent on the thickness of the iron yoke inside the magnets, and on the magnetization configuration within a pole of the magnets. This is explained by analyzing the magnetic coupling strength of each pole. Finally, the computer calculation is tested using an experimental data taken from a sintered NdFeB magnetic gear.

Theoretical computations of the magnetic coupling between magnetic gears

The torque of magnetic coupling with different magnetic poles has been investigated by theoretical computations with both 2D and 3D modelling processes of the finite element analysis. The torque can be increased by increasing the number of poles for magnetic coupling between magnetic gears with 2 mm separation distance, provided that the number of poles is less than 10. However, the torque is inversely proportional to the number of poles when its number is larger than 10. This phenomenon is explained by analyzing the magnetic coupling strength of different poles. The 3D computer simulations are in excellent agreement with the experimental values. The 2D computer simulations can be improved by a "two magnetization vectors within a pole" technique; i.e. by properly rotating the angle between the two magnetization vectors.

The radial magnetic coupling studies of perpendicular magnetic gears

The torque of the radial magnetic coupling between perpendicular magnetic gears with different magnetic poles has been investigated experimentally. The torque of magnetic coupling decreases with increasing the distance between the magnetic gears. For different multipole magnetic couplings with the same magnetic field strength, the torque of magnetic coupling increases as the number of magnetic poles increases for distances smaller than a critical separation distance d/sub c/, but it is reversed as the separation distance becomes larger. This critical separation distance for our sintered NdFeB magnet system with an iron yoke of 2 mm thickness is roughly between 9 and 11 mm. This phenomenon is explained by analyzing the magnetic coupling strength of different poles of magnets on the perpendicular magnetic gears.

Theoretical computations for the torque of magnetic coupling

The torque of magnetic coupling with different magnetic poles has been investigated by theoretical computations with both FEA and torque formula techniques. The torque of magnetic coupling is sensitive to the number of magnetic poles, and it decreases with increasing the distance between the magnetic rings. From our theoretical computations, we find that we can increase the torque by increasing the number of poles for magnetic coupling between magnetic rings with short distance; however, this is not true for magnetic rings with large separation. We also demonstrate that the theoretical computations of both MagNet software and torque formula established by Furlani (1993) are quite consistent and useful for computing the torque of various magnetic couplings. Finally, the theoretical calculation has been successfully tested by using an experimental data taken from a NdFeB magnetic coupling.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

The radial magnetic coupling studies between magnetic gears

The torque of the radial magnetic coupling between magnetic gears with different magnetic poles has been investigated by experimental and computer simulation analyses. The torque of magnetic coupling is sensitive to the number of magnetic poles, and it decreases with increasing the distance between the magnetic gears. We can increase the torque by increasing the number of poles for magnetic coupling between magnetic gears with short separation distance. The three dimensional computer simulation calculated values of the torque of magnetic coupling by both the virtual work technique and Maxwell stress tensor method are in excellent agreement with the experimentally measured values.

Effect of magnetization profiles on the torque of magnetic coupling

The torque of magnetic coupling is sensitive to the number of magnetic poles, the magnetization profiles, the magnetic field strength of magnets, and the separation distance between the magnets of the coupling. For different multipole magnetic couplings with the same magnetic field strength, the torque of magnetic coupling is proportional to the number of magnetic poles at small separation distance, but it is inversely proportional to the number of magnetic poles as the separation distance becomes large. The theoretically calculated values of the torque of magnetic coupling are in excellent agreement with the experimentally measured values.