SU864458A1 - Contact-free magnetic reducing clutch - Google Patents

Description

(54) NON-CONTACT MAGNETIC CLUTCH REDUCER

one

The invention relates to electrical engineering, in particular, to besk (rn-ktnym magnetic coupling gearboxes), and can be used in mechanical engineering and instrument-making to transfer the moment from one shaft to another with simultaneous reduction of speed.

Non-contact couplings-reducers are known that contain permanent magnets with gear elements placed on parallel axes and a sealing wall between them 1.

The disadvantage of these couplings is the radial forces on the bearings, which lead to a decrease in their service life, and the small transmitted moments due to the significant dispersion of the magnetic flux.

Closest to the proposed, the technical essence and the achieved result is a contactless magnetic gearbox, containing concentrically arranged toothed driven half coupling and leading to the coupling, equipped with a single pair of poles excitation system and made in the form of an axially magnetized permanent magnet with a pole tip, on one /

an I2 of its ends, a sealing cup made of an insulating material with ferromagnetic inserts placed in two rows along the edges of its cylindrical surface opposite the poles of the excitation system, and the number of teeth of the driven coupling half is equal to the sum of the number of inserts and the number of poles of the magnetic system;

10 and a sealing cup is installed in the gap between the semi-coupling 2.

The disadvantage of this device is small and the stability of the transmitted torque.

15

The aim of the invention is to increase the magnitude and stability of the transmitted moment.

To accomplish this goal, the coupling is provided with an additional pole 20 tip mounted on the opposite end of the ring permanent magnet, with the central angle of the pole arc of these tips being 90, and the number of teeth of the driven half coupling

ZP 2 (2n + 1), where, 2,3 ...

FIG. 1 shows the coupling gearbox, a general view; in fig. 2 shows a section 30A-A in FIG. one.

The clutch-reducer contains the leading 1 and the 2 coupling halves which surrounds it and 2 glass cup 3 installed in the gap between them.

The leading coupling half 1 is made in the form of a cylindrical axially magnetized permanent magnet 4 with two pole tips 5 of magnetically soft material, each having two teeth (poles) b. Slave 2 half coupling made of a magnetically soft material in the form of a hollow cup, on the side walls of which the grooves are cut through, forming Zp teeth, axially blocking the teeth of the leading coupling half 1. soft material. The number of inserts is 7 in each row of Zjj. The rows are located in the zone of the pole pieces 5 of the leading coupling half 1.

The principle of the coupling gearbox is as follows.

The permanent magnet 4 generates an axial excitation flow, which closes i through the pole pieces 5, working air gaps, magnetically soft inserts 7 of the sealing cup 3, working air gaps and teeth of the driven coupling half 2. With the ECU, the coupling coupling half takes the position corresponding to maximum conductivity for the excitation flow, which is ensured when the maximum number of teeth coincides with the inserts 7 of the sealing cup 3 and with the direction of the magnetic field vector of the vector. When the shaft rotates, s coupling part 1 there is a rotation of the permanent magnet and the pole, i.e. a rotating magnetic field is created that is rigidly connected to the pole tips 5. At the same time, this rotating magnetic field will be modulated in amplitude by inserts 7. of the sealing cup 3, which ensures the synchronous rotation of the driven coupling half 2 with a reduction factor equal to

; R

1-p-,

where P is the number of teeth (poles) b

leading half coupling, ZP - the number of teeth driven 2

coupling half.

From this formula it follows that the simplest way to vary the reduction coefficient over a wide range is to change the number of teeth of the driven half coupling 2, and to obtain the maximum value of i, taking into account the requirements of moment stability and simplicity of design, P should be chosen minimal, i.e. equal to the 2nd In this case, according to theory

gear el. machines, it is necessary that the number of .tabs of the driven coupling half Zf differed from the number of inserts 7 glasses 3 Z into two. Since, with ZP ZQ, the rotation of the driven shaft will pass counter to the rotation of the magnetic field vector, which will cause additional losses, it is necessary that-ZP have more Zc. To increase the transmitted moment

it is necessary to ensure that the maximum number of teeth of the driven half-coupling participates in the creation of the useful moment, and all the teeth that create the moment of opposite direction are demagnetized. This is achieved by making the serrated arc of the teeth 6 of the leading half-coupling 1 equal to 90. In this case, the maximum number of teeth (marked by arrows) creates a useful moment, and the remaining teeth

remain demagnetized.

The increased stability of the transmitted moment in the dynamics can be achieved by satisfying the condition in which, when turning the drive of the half coupling 1, the area of its teeth 6 overlapping with the windows of the sealing cup 3 remains constant. This is achieved when the number of teeth is driven by the driven 2 coupling half according to the formula

. ZP 2 (2n +1), where n 1, 2, 3 ...

The proposed device allows an increase in the magnitude and stability of the transmitted moment compared with similar structures, since the teeth, which could create a parasitic moment, are always in a demagnetized state. In addition, compared with the known, the coupling is simpler to manufacture, since the permanent magnet is cylindrical and has axial magnetization.

Claims (2)

1. Ganebburg, LB, et al. Mechanisms with magnetic coupling. L., Mashinostroenie-, 1973, p. 129. 2. Authors certificate of the USSR 544070, cl. H 02 K 49/10, 1975. Riga.1