Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1987-04-08
1988-06-28
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 86, 310 90, 384610, 3849071, 417420, H02K 5173, H02K 502
Patent
active
047541814
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a magnet coupling which is usable in any environment (a gas, a fluid or a vapor) and improved in torque transfer efficiency.
BACKGROUND ART
FIGS. 17 to 19 are vertical sectional views of conventional magnet couplings respectively. FIG. 17 shows a synchronous type magnet coupling in which magnets 3 and 4, each consisting of permanent magnets alternately different in polarity, are disposed on the peripheries of the respective end faces of a drive-side yoke 1 and a load-side yoke 2 which are rotatably supported, so that torque is transferred only when the yokes 1 and 2 rotate synchronously. FIG. 18 shows a hysteresis magnet coupling in which a magnet 3 and an isotropic magnet 34 are used on the drive and load sides respectively to transfer a predetermined torque independently of the number of revolutions. FIG. 19 shows an eddy current magnet coupling in which a magnet 3 is employed on the drive side, while a magnetic material such as carbon steel or cast iron is employed on the load side. In these magnet couplings, the drive side and the load side are spaced apart from each other, and an isolating plate 5 is disposed in the illustrated gap G between the drive and load sides so that the drive side is not affected by the load-side environment.
As illustrated, keyways are cut in respective central bores 8 and 9 of the yokes 1 and 2, and drive and driven shafts are fitted into these keyways and thus rotatably supported by the axially outer portions, respectively, of the magnet coupling.
In all of these magnet couplings the smaller the illustrated gap G, the greater the value of transferred torque. However, in the conventional magnet couplings, the isolating plate 5, which isolates the drive and load sides from each other, involves deviations in terms of the machining accuracy and the axial center, and each of the members of the magnet coupling on the drive and driven sides is supported in a cantilever manner, which means that the support conditions are inferior and readily affected by wear of bearings or the like. Accordingly, the gap G is generally set at 5 to 10 mm, modally a value close to 10 mm. It is particularly difficult to produce the eddy current coupling shown in FIG. 19, because the control of the gap is effected through a non-magnetic disk plate 35, and the transferred torque is particularly weak in this case.
10 In the prior art it is necessary to provide gaps between the isolating plate 5 and the drive-side magnet 3 and the isolating plate 5 and the load-side driven magnet 4 or magnetic yoke 2, respectively, and the drive- and load-side rotary members cannot be rotatably supported at the sides thereof which are closer to the isolating plate 5. Accordingly, the size of the device is unavoidably increased in its axial direction, because of to the structures of bearings for thrust and radial directions which support the attraction forces on the drive and load sides of the magnet coupling, or the bearing portions complicate the arrangement of the device. In a device which handles a fluid, for example, a pump, the bearing portion interferes with the flow path resulting in problems such as an increase in the fluid resistance.
DISCLOSURE OF INVENTION
It is an object of the present invention to eliminate the above-described problems in the magnet couplings having drive- and load-side members disposed across an isolating plate and provide a magnet coupling in which the gap between the drive and load sides is reduced and the power transfer efficiency is greatly improved.
It is another object of the present invention to provide a magnet coupling which is particularly designed so that the structure for supporting the load-side rotary member can be simplified.
The present invention provides a magnet coupling having a load-side rotary member and a drive-side rotary member hermetically coupled through an isolating plate and connected together by means of magnetic couplings, characterized in that a bearing is provided between the isolating plate an the load-si
REFERENCES:
patent: 2975713 (1961-03-01), Wright
patent: 3195035 (1965-07-01), Sudmeier
patent: 3310693 (1967-03-01), Aronoff
patent: 3497273 (1970-02-01), Muijderman et al.
patent: 3711171 (1973-01-01), Orkin
patent: 4207485 (1980-06-01), Silver
patent: 4408966 (1983-10-01), Maruyama
patent: 4575264 (1986-03-01), Mizobuchi
Patent Abstracts of Japan, vol. 4, No. 137 (E-27);[619] Sep. 25,1980; JP-A-5588545, Matsushita Denki Sangyo k. k., Jul. 4, 1080, Ooya.
Kimura Yoshikazu
Mizobuchi Shotaro
Sasaki Katsumi
Ebara Corporation
Rebsch D. S.
Salce Patrick R.
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