Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1994-01-06
1996-01-23
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Linear
310 13, H02K 4102, H01F 706
Patent
active
054867274
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a linear accelerator comprising at least one longitudinal stator portion (I, II, III; 4) defining a linear path of movement and having a plurality of stator coils (8-14, 70), and a runner (30) accelerable along the path of movement having a plurality of runner coils (34-40, 44).
Such apparatus are generally designed as linear drives. A known design is with a longitudinal stator divided into a plurality of stator portions each equipped with a separate power supply, over which a runner in the form of a wagon, slide or the like equipped with runner coils on the underside is moved. Such apparatus serve to move and position machine parts, to transport goods and the like.
The present invention is intended to provide a linear accelerator not so much for moving the runner over great paths and positioning it exactly at a certain point of the longitudinal stator portion, as for giving the runner a very strong acceleration for a relatively short path, whereby the runner has a certain mass. Along with the limited positional relation between stator and runner which is in any case necessary in the course of acceleration, what is essential is the high acceleration of the runner so that the runner mass can be used e.g. as a ram or the like, e.g. in cases where steam rams and the like have hitherto been used. Other fields of application for the linear accelerator are also possible.
Previous embodiments of linear drives are unsuitable as strict accelerators since the magnetic fields are generally produced only on one side of the stator or the runner, the result being that the magnetic fields are present to an insufficient extent relative to the runner mass, and furthermore the elements for guiding the runner along the stator portion are unsuitable for strong accelerations.
By contrast, the invention provides a linear accelerator of the abovementioned type wherein the stator coils as well as the runner coils are disposed rotationally symmetrically in a plane perpendicular to the path of movement with respect to an axis parallel to the path of movement.
The total assembly comprising stator portion and runner is of rotationally symmetric construction. The term "stator portion" here means a stator portion provided with its own power supply. A plurality of stator portions each provided with a separate power supply can accordingly be disposed along the path of movement to permit optimal regulation of the individual stator portions in accordance with the position of the runner and the acceleration present there.
The rotationally symmetric arrangement of stator portion and runner causes a very strong interaction to take place between stator and runner. This interaction can take place over the total periphery of the runner, in particular since the stator coils are aligned so as to give rise to a magnetic field surrounding the axis in rotationally symmetric fashion.
One can dispose e.g. four stator coils symmetrically about the axis, in the spaces between the four stator coils there being runner coils through which the magnetic field produced by the stator coils flows.
In contrast to known linear drives, the runner in the inventive linear accelerator is surrounded by a magnetic field which corresponds to a closed circle in the plane perpendicular to the axis. This permits considerable forces to be transmitted to the runner so that the runner undergoes very high acceleration over a very short path. The accelerated runner must involve a commutation, the commutation being adapted to the acceleration of the runner. For this purpose one commutating means or--alternatively--a plurality of commutating means working in parallel are provided per stator portion according to the invention. The electronic commutation thus takes place portion by portion or--even better--piece by piece within a stator portion. This permits the commutation to be optimally adapted to the particular acceleration of the runner at various points of the stator portion or portions. To obtain correct and optimal commutation the electronic
REFERENCES:
patent: 3581127 (1971-05-01), Warnett
patent: 3751693 (1973-08-01), Gabor
patent: 3803466 (1974-04-01), Starkey
patent: 3816776 (1974-06-01), Chari
patent: 4187453 (1980-02-01), Rough
patent: 4616153 (1986-10-01), Lee
patent: 4795928 (1989-01-01), Suzuki et al.
patent: 5077509 (1991-12-01), Wilson
patent: 5270593 (1993-12-01), Levi et al.
patent: 5288956 (1994-02-01), Kadokura et al.
patent: 5294850 (1994-03-01), Weh et al.
patent: 5302872 (1994-04-01), Ohki et al.
Ehrhart Peter
Grundl Andreas
Heidelberg Gotz
Reiner Gerhard
Dougherty Thomas M.
Jones William W.
Magnet-Motor Gesellschaft mbH
LandOfFree
Linear accelerator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Linear accelerator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear accelerator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1506630