SU846892A1 - Wave-type magnetic reduction gear - Google Patents

Description

one

The invention relates to electromechanics, and more specifically to precision wave magnetic gearboxes.

The well-known wave magnetic gearboxes contain two coaxial rings of non-magnetic material, in which plates (teeth) of magnetically soft material are placed, and permanent magnets, providing a magnetic force of interaction between the rings fl 1-

A disadvantage of the well-known editors is their low accuracy, due to the dependence of the accuracy of the angular position of the output shaft on its radial beat. When the gearbox B is operating in a lowering mode.

The sum error of the angular position of the output shaft of such a gearbox is composed mainly of two components; from the error caused by the inaccuracy of the angular position of the plates of the "pressurized soft material" and the error caused by the radial beating of one ring relative to the other caused by the beating of the output shaft.

The error due to the inaccuracy of the angular position of the plates is determined by the formula

5Л. Ф,

where & F is the average position error

plates (teeth); N is the number of interacting teeth;

The error due to radial runout is determined by the formula

„Where r is the radius of the working gap}

S is the gap between the rings; ; i lg - beating.

With a large number (of the order of 200-300) the number of teeth and a common for the standard dividers collision of the angular position of the plates (order 1) error 3 due to radial beats can significantly exceed 25 error A due to inaccurate placement of the plates.

The closest to the proposed technical essence and the achieved result is a wave magic gearbox containing a permanent magnet-mounted rotor mounted on a drive shaft, coaxially mounted two rings of non-magnetic material with plates of magnetic soft material placed in them. Such a magnetic circuit allows one-sided magnetization of permanent magnets to exclude the reversal of the teeth during operation, and therefore drastically reduces hysteresis losses, allows you to have any, including odd, number of pole pairs / that provides a wider, in the case of single-shaft gearboxes, the range of permissible transfer ratios, and also makes it possible, by turning the wheel by 180 while cutting the second row of teeth, to eliminate the periodic component of the angular position error ubev 2.

However, the error in the angular position of the output shaft uf, due to radial beating, with a large (about 200-300) number of teeth and a standard error for standard dividing devices (order 1) can significantly exceed the error due to inaccuracy of the angular position of the plates.

The purpose of the invention is to improve the accuracy of transmission and increase the output torque.

This goal is achieved by the fact that the wave magnetic gearbox is equipped with a ring with radially placed plates of magnetic soft material installed in the radial gap between the inner and outer rings, the latter are rigidly interconnected, and their plates lie in pairs on the same radius.

FIG. 1 shows the proposed (“iw wave magnetic reducer with a two-row arrangement in all three rings and with the number of pairs of magnetic fields equal to three, the section; in Fig. 2, the same end section.

The gearbox contains coaxially mounted non-magnetic rings 1 and 2 rigidly interconnected in a single piece 3, which is also a hermetic shield separating the non-magnetic ring 4 from the rotor 5 with permanent magnets 6. The rotor 5 is mounted on the drive shaft 7, rotating bearings 8. The middle ring 4 is mounted on the output shaft 9, rotating in bearings 10. In rings 1,2 and 4 plates 11-13 of magnetic soft material, respectively. The ring 1 is covered from the outside by a continuous ring of magnetic soft material 14 and is rigidly connected with it to the cap 15. The cover 16 is attached to the part 3. The number of plates and their angular position in the rings 1 and 2 coincide, the indicated number can be equal to the number of plates

in ring 4 or it may differ from it by a number equal to or a multiple of three.

In the case of equality of the number of plates in these rings in at least one of the three rings, the plates are placed with non-uniform angular pitch with an angular period of 120. This gearbox converts the uniform rotation of the input shaft into the oscillatory motion of the output shaft.

0 if the number of plates in these rings differs by a number equal to or a multiple of three, and the plates in all rings are placed with a constant angular pitch, the gearbox converts the even 5 rotation of the input shaft into a uniform rotation of the output shaft. If at the same time, at least in one of the rings, the plates are split with variable angular pitch, this gearbox converts the uniform rotation of the input shaft to the rotational-oscillatory movement of the output shaft. A reducer scheme is permissible, in which in one of the rings, except the middle one, the plate

5 are placed in one row, while their length in the axial direction exceeds twice the corresponding size of the plates placed in the adjacent ring, as well as the scheme in which in all the rings the platinum plates are placed in

0 one p d.

The proposed gearbox works as follows.

The permanent magnets b provide a force interaction between the plates 11, 12 and 13, which causes the ring 4 to set in a certain equilibrium position due to equality to zero (if there is no load at the output)

0 total moment acting on all plates. This equilibrium position, if there is any discrepancy in the angular distribution of the plates,: in rings 1 and 2 on one side and ring 4 on the other, changes for 5 s when rotating permanent magnets 6, which causes rotation of ring 4 relative to rings 1 and 2.

The error position of the output shaft of the gearbox, due to

0 by the radial beating of the outer and inner rings relative to the average 1, is determined by the formula

J. ()

QH

2 rf

h

five

where d is the thickness of the middle ring. This error is / d times less than the error of a two-wheel reducer, usually the ratio / d exceeds the number 10. The error) of the angular position of the output shaft, dN / (for

0 the count of inaccuracies of the angular position of the plates Af is determined by the formula

st .-- (2N) (l).

and has the same order as the two-wheel gearbox. The ACS error due to the mismatch of the axes of symmetry of the plate system in the inner to outer ring dg is determined by D,,

However, in a variant in which the plates are arranged in two rows in all three rings, provided that the grooves for the plates are cut together in the outer and inner rings, the indicated error is averaged over a large number of plates and is negligible.

The introduction of two additional gaps into the magnetic circuit, an additional ring, and therefore, in the sum of the components, usually about one percent of the cyNwapHofi length of a constant magnet along the mean force, slightly increases the demagnetization coefficient, which results when using highly coercive magnets, for example, from an SD alloy. Co, to a negligible reduction in induction in the gap. Thus, the moment and rigidity of the proposed gearbox is almost twice as much as the corresponding characteristics commensurate with BAT two-wheel gearbox.

Claims (2)

1. USSR author's certificate number 280142 ,. cl. F 16 H 1/06, 1968. 2.Pa: tent of the USA No. 3.301.019, cl. 74-640, 1967 (prototype). f5 ID /. f / f ft 12 but 9t.1