UA146124U - MAGNETIC CLUTCH - Google Patents

Abstract

The magnetic coupling contains two disk half-couplings, which are at a distance of 0.1… 0.25 mm from each other, each of which is made of non-magnetic material, on which are mounted in a circle permanent magnets with alternating polarity. On each of the half-couplings are magnets directed to each other by the same poles S. In addition, the magnets of one part of the coupling go between the magnets of the second part.

Description

A useful model belongs to the field of mechanical engineering, in particular to the designs of magnetic couplings designed for non-contact transmission of torque from one shaft (driving) to another shaft (driven).

Magnetic couplings are known, in which the torque is transmitted due to the magnetic attraction between magnets of different polarity, which are located against each other on the leading and driven half-couplings through an air gap. The absence of mechanical contact and wearing parts in these couplings helps to increase their service life. By adjusting the distance between the half couplings, you can change the force of interaction between the magnets, which is proportional to the square of the induction in the gap. The limiting moment transmitted by such a coupling is proportional to this force, in addition, the presence of a gap between the semi-couplings allows the torque to be transmitted into a closed space, through the wall. When the load moment on the driven shaft exceeds the set limit torque of the clutch, for example, when the load jams, the magnetic clutch begins to slip, which allows you to avoid damage to both the clutch and the drive motor.

A well-known analogue is a disc magnetic coupling, each half-coupling of which consists of a non-magnetic case, in which a magnet wire is embedded (L.B. Ginzburg, A.Y. Fedorov

Design of electromagnetic and magnetic mechanisms - L.: Mashinostroenie, 1980. - 346 p). An even number of permanent magnets with alternating polarity are installed on the magnetic circuit evenly around the circle. The space between the case, the magnetic circuit and the magnets is filled with plastic, for example, a compound based on epoxy resin.

The disadvantage of such clutches is that the force acting on the magnets tends to pull them out, it is especially large during a sudden change in rotation speed (in particular, during acceleration or sudden braking).

That is, an increase in force increases the probability of pulling out the magnets, which is confirmed by the practice of operating such couplings. In this connection, there is a need to fix the magnets in the coupling.

The closest in technical essence and the achieved result is a declaratory patent

of Ukraine Mo 54314, published in the bulletin Mo 2, 2003. A magnetic coupling comprising a coaxially arranged first rotor with permanent magnets rigidly connected to the first shaft (first half-coupling) and a second rotor with permanent magnets rigidly connected to second shaft (second

From the semi-coupling). The permanent magnets of both rotors are magnetized along the axis of the coupling and installed in a circle, creating two multipole systems with an equal number of poles and alternating polarity. Due to the forces of mutual magnetic attraction of the magnets of both rotors, when one of the shafts is forced to rotate, the second shaft rotates in the same direction and at the same speed as the first shaft.

The disadvantage of a close analogue is that when the driven part of the clutch rotates relative to the driver, the torque of the clutch decreases due to the radial displacement of the magnets of the driven part of the clutch relative to the driver. At the same time, the force of attraction between the magnets decreases due to the increase in the distance between the magnets and, accordingly, the component of this force that provides the torque. Another disadvantage of the known coupling is that the design of disk semi-couplings must be complicated in order to mechanically keep the magnets from pulling them out of their installation places.

The task of the proposed useful model is to improve the magnetic coupling due to the features of the location of the magnets, which are directed to each other by the poles of the same name, which makes it possible to increase the efficiency of transmitting torque from one shaft (driving) to another shaft (driven).

The problem is solved by the fact that in a magnetic coupling, which contains two disk half-couplings that are at a distance of 0.1...0.25 mm from each other, each of which is made of a non-magnetic material, on which permanent magnets with with alternating polarity, according to a useful model, on each half-coupling there are magnets directed to each other by poles of the same name 5, in addition, the magnets of one part of the coupling overlap between the magnets of the second part.

The essence of the proposed useful model is explained by the drawings where: in fig. 1 - shows the general view of the magnetic clutch in section, side view; in fig. 2 - the leading part of the semi-coupling 1, which shows the location of the magnets C with the polar orientation shown; in fig. C - the reduced part of the half-coupling 2, which shows the location of the magnets 4 with an indication of the polar orientation.

The magnetic coupling (Fig. 1) consists of two disk half-couplings 1, 2, which are at a distance of 0.1...0.25 mm from each other, each made of a non-magnetic case, on which three permanent magnets 3 are installed around the circumference , 4 at an angle of 1207 with the polarity of the same name 5. In the assembled coupling (Fig. 1), the magnets are arranged in a staggered order and are directed to each other by the poles of the same name 5, since there is no force acting on the magnets 3, 4 that tears them out of the housing, then it is enough to fix them in the half-coupling housings 1, 2 with the help of sealant 5.

The magnetic clutch works as follows.

During the rotation of the driving part of the semi-coupling 1, magnets Z interact with magnets 4 and cause the rotation of the driven part of the semi-coupling 2, while the magnets Z of the semi-coupling 1 are installed between the magnets 4 of the semi-coupling 2. In the case of magnetic interaction, the principle of transmission of traction forces is applied to the magnets Z and 4 due to the compression of unidirectional lines of force of permanent magnets.

The application of the proposed useful model provides an increase in torque and increases the reliability and efficiency of the use of the clutch.

Claims (1)

UTILITY MODEL FORMULA A magnetic coupling containing two disk half-couplings 0.1...0.25 mm apart, each made of a non-magnetic material, on which permanent magnets with alternating polarity are installed in a circle , which is distinguished by the fact that on each half-coupling there are magnets directed to each other by poles of the same name 5, in addition, the magnets of one part of the coupling overlap between the magnets of the second part. i et sh I. NYA sh My: pe SO vin I Esh YAM, Fig. / I Fo SHU N WITHOUT Fig. 2nd class of B: t / Fig. WITH