Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1989-06-20
1992-01-07
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Linear
310 83, 310 905, H02K 4100, H02K 709
Patent
active
050794582
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a non-contacting or contact-free linear drive according to the preamble of claim 1 and such as is e.g. used for driving magnetic suspended railways and elevators.
Such a linear drive is known from DE-OS 31 20 28 and at present several non-contacting linear drive systems are known.
For example, a so-called linear motor is known, in which the stator is provided along the guideway or track, while the rotor is located on the vehicle. Another known system has permanent magnets along the guideway or track, while the vehicle carries an electromagnet, which continuously changes its polarity, so that it is drawn along the permanent magnets.
All these known drive systems suffer from the disadvantage that they consume a large amount of electric current, particularly because there is a relatively large air gap between stator and rotor. However, the power consumption increases with the square of the distance and in addition a relatively large amount of energy is lost through heat generation.
DE-OS 31 20 328 discloses a linear motor whose primary part is a rotary cylindrical roller, on whose circumference are helically provided magnets. The north and south poles are constructed as continuous bands or strips and as a result in the vicinity of the cylinder surface is formed an axially travelling field. Due to the close succession of the magnetic pole strips, said field in part briefly closes between the poles and only a relatively small part closes over the secondary part, in which is also produced a relatively high eddy current proportion. Therefore this known motor is not very economic.
In addition, German Patent 34 28 684 discloses a magnetic gear whose primary part is constructed as a magnet wheel, which cooperates with a secondary part slotted in tooth-like manner. This magnetic construction also has relatively low efficiency because the magnetic circuit is only closed over the secondary part by two successive poles on the wheel circumference.
SUMMARY OF THE INVENTION
The problem of the present invention is to provide a non-contacting linear drive which has a very economic construction and operation. This problem is solved by a non-contacting linear drive which includes at least one linearly oriented, tubular fixed guidance part of ferromagnetic material. Ferromagnetic double helixes are provided on the inner wall surface of the guidance part. The guidance part is a profile part. At least one rotatable transportation part including a permanent magnet is movable along the guidance part and is arranged coaxially therewith. Each helix of the guidance part corresponds to a pole of the magnet of the at least one transportation part. The rotatable transportation part also has double helixes of ferromagnetic material which are arranged around a core. A magnetic circuit is formed by the guidance part and the transportation part for producing a constant magnetic field. The permanent magnets in the transportation part are mounted in such a way that the two helixes of the transportation part are oppositely polarized.
The construction of the operationally essential parts as a profile part and a double helix is relatively simple and leads to an inexpensive construction.
According to a further development of the inventive concept, either the double helix can be the fixed guidance part and the rail the movable transportation part or vice versa. When the invention is used for vehicles, e.g. magnetic suspended railways, it is appropriate to use the profile rail as the fixed guidance part and the double helix as the movable transportation part. The rail can simultaneously form part of the suspended railway, while the double helix is fixed to the vehicle.
According to a further development of the inventive concept the profile part can be differently constructed. It is important that in the same axial distance sequence as for the helixes, the profile part always does or does not have material in the vicinity of the helix (rhythm: material yes-no-helix-yes-no-helix, etc.).
Thus, the profile part can be
REFERENCES:
patent: 4037886 (1977-07-01), Boden et al.
patent: 4065188 (1977-12-01), Ridler et al.
patent: 4234831 (1980-11-01), Kemmer et al.
patent: 4712027 (1987-12-01), Karidis
Krasnikou, "Mechanisms and Transmissions with Magnetic Links", Russian Engineering Jour., vol. 53, No. 4, 1973, pp. 27-29.
Rebsch D. L.
Stephan Steven L.
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