Classification and characteristics of speed-regulating asynchronous magnetic couplers

admin 4 hours ago 4 min read

https://www.magicmag-tech.com/Classification-and-characteristics-of-speed-regulating-asynchronous-magnetic-cou.html

The speed-regulating asynchronous magnetic coupler can be used by changing the relative position of the rotor of the permanent magnet layer and the rotor of the conductor layer In order to achieve a change in its torque transmission capacity, and thus change its output speed. According to the different forms of its structure, it can be mainly divided into speed-regulating cartridge asynchronous magnetic coupler and speed-regulating disc asynchronous magnetic coupler.

1.3.1 Speed-regulating cartridge asynchronous magnetic coupler

Drum-type speed-control asynchronous magnetic

The basic structure of the coupler, or DSAMC for short, is shown in the figure, which is mainly composed of an inner rotor, an outer rotor, and an air gap group. The inner rotor comprises an inner yoke iron and a conductor layer, wherein, the conductor layer is generally made of metal materials with high conductivity, such as copper and aluminum; The outer rotor includes an external yoke iron and a permanent magnet layer, among which the permanent magnet layer is generally selected with a large magnetic energy product The NdFeB material is magnetized in the direction of parallel magnetization or radial magnetization. When the internal and When the meshing length of the outer rotor changes, the energy transferred changes due to the change in the magnetic field lines passing through the inner rotor. In addition, the torque transmission capacity is changed, and the speed regulation function is realized. Depending on the structure of the internal rotor, The speed-regulating cartridge asynchronous magnetic coupler can also be divided into two types: squirrel cage type and double-layer solid type (see figure). In the former, the torque density is larger, but the structure is complex, and the design and manufacturing are difficult; The latter, the structure is relatively simple, designed The manufacturing cost is low, which is conducive to mass production in industry. In order to regulate the speed type with great application prospects The asynchronous magnetic coupling is an in-depth theoretical study, and the latter is the research object in this paper.

1.3.2 Speed-regulating disc asynchronous magnetic coupler

Axial-flux speed-control asynchronous magnetic

The structure of the coupler, or ASAMC for short, is shown in the figure, which consists of a conductor layer rotor, a permanent magnet layer rotor, and gas Gap composition. The conductor layer rotor comprises a conductor disc yoke iron and a conductor layer; The permanent magnet layer rotor consists of a permanent magnet disc yoke iron and permanent magnet layers. The selection of materials is the same as that of the speed-regulating cartridge asynchronous magnetic coupler, but its permanent magnet layer Axial magnetization is generally used in the magnetization direction. When the permanent magnet layer rotor and conductor layer rotation are changed through the speed regulating mechanism When the air gap thickness of the atom is thick, the magnetic coupling is electromagnetically due to the change in the magnetic flux density of the air gap between the rotors The torque is changed, and the speed regulation function is realized. Figure 1.11 shows a speed-regulating disc asynchronous magnetic coupler Another structure consists of two conductor rotors with a symmetrical distribution and two permanent magnet rotors with a symmetrical distribution, which produces 2 times the electromagnetic torque of the previous structure and is due to the high two axial forces generated by the device Small, equal, opposite directions, realize the mutual cancellation of forces, so there is almost no axial force effect on the device Therefore, in industrial applications, this structure is more widely used.

1.3.3 Characteristics of speed-regulating asynchronous magnetic couplers

When the speed of the fan and pump load is regulated by the speed-regulating magnetic coupler, it has the following characteristics:

Under:

The structure is relatively simple, the cost is low, and the equipment stability is high;

It is convenient to adjust the flow rate of fans and pumps, and the energy-saving effect is remarkable;
Effectively avoid cavitation and surge during the operation of fans and pumps, and improve the safety of operation;
The power equipment can be optimized, the power of the motor can be reduced, and the system operation efficiency can be improved;
The blade adjustment device of the fan and pump device can be canceled to realize the simplification of the structure and reduce the cost;
Able to adapt to harsh working environments, such as high temperature, humidity, flammable, explosive and other environments;
It can eliminate about 80% of the vibration and effectively protect the key equipment such as motors;
The speed regulation range is large, about 0~98%.