Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-08-08
1999-12-14
Enad, Elvin G.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 67R, 310 68R, 310254, 310266, 310 67A, 310 66, H02K 122
Patent
active
060021926
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates in general to drives for transportation facilities, in particular, for actuating roller-mounted platforms, invalid wheelchairs, and the like.
BACKGROUND ART
Known in the present state of the art is a drive for transportation facilities, comprising an axle with a stator, a rotor fitted rotatably on said axle, to form an electric motor, and a rim (cf. U.S. Pat. No. 5,330,026, Cl. A63C 17/12, 1994).
However, the known drive is but of low efficiency.
DISCLOSURE OF THE INVENTION
The present invention has for its principal object to provide a drive for transportation facilities which allows of bettering the starting characteristics of said facilities.
The essence of the present invention resides in that the drive has permanent magnets, cores with coils, and rotor angular position transducers. The rotor appears as concentric shells and is connected to the rim; the permanent magnets are arranged on the shells one against the other facing each other with their opposite poles; on each shell the permanent magnets are arranged with alternating polarity; the stator is interposed between the permanent magnets and carries coils with cores, said coils being peripherally connected to the stator and being arranged in a spaced relation to the permanent magnets; the rotor angular position transducers are held in place on the stator and are electrically connected to the coils which are assembled into a winding having two or more phases subdivided into phase zones having n coils belonging to the same phase, where n=1, 2, 3 . . . the coils of phase zones or of all phases are spaced apart with a pitch differing from the pitch with which the permanent magnets are arranged by a value equal to .alpha.
-1 . . . .alpha.
, where .alpha. denotes an angular width of the magnet-to-magnet gap; the rotor angular position transducers are interposed between the cores, one transducer per phase, in such a manner that with `n` being an even number, the transducers are located on the stator outside facing the permanent magnets and along the axes of the phase zones, and with `n` being an odd number, the transducers are displaced for an angle multiple of half the angular pitch of the permanent magnets with respect to the axes of the phase zones.
It is expedient that the shells are made of a soft magnetic material.
Practical use of the present invention will help increase its efficiency due to improved starting characteristics thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
In what follows the present invention will now be disclosed in a detailed description of an illustrative embodiment thereof with reference to the accompanying drawings, wherein:
FIG. 1 is a sectional view of the drive, according to the invention;
FIG. 2 is a section taken on the line A--A, according to the invention; and
FIGS. 3 and 4 present a partially developed view of the rotor and of the stator cores with reference to two phase zones of the stator winding, with n=2 and n=3, according to the invention.
BEST METHOD OF CARRYING OUT THE INVENTION
The drive for transportation facilities comprises an axle 1 with a stator 2 and a rotor 3 set rotatably on said axle to form an electric motor 4, and a rim 5 (FIG. 1).
The drive has permanent magnets 6, 7, 8, and 9, cores 10 with coils 11, transducers 12 of angular position of the rotor 3, each of said transducers consisting of, e.g., two magnetosensitive Hall generators (FIGS. 1, 2).
The rotor 3 appears as concentric shells 13, 14 made of a soft magnetic material and is connected to a rim 5.
The permanent magnets 6, 7, 8, and 9 are arranged on the shells 13, 14 one against the other facing each other with their opposite poles; on each shell 13, 14 the permanent magnets 6, 7, 8, 9 are arranged with alternating polarity.
The stator 2 is interposed between the permanent magnets 6, 7, 8, and 9 and carries the coils 11 with the cores 10, said coils being peripherally connected to the stator 2 and being arranged in a spaced relation to the permanent magnets 6, 7, 8, and 9.
The rotor ang
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patent: 3396296 (1968-08-01), Esters
patent: 3538364 (1970-11-01), Favereau
patent: 4073356 (1978-02-01), Schlicht
patent: 4731554 (1988-03-01), Hall et al.
patent: 4900965 (1990-02-01), Fisher
patent: 5236058 (1993-08-01), Yamet et al.
patent: 5330026 (1994-07-01), Hau et al.
patent: 5554903 (1996-09-01), Takara
Atrushkevich Anatoliy Anatolievich
Avdonin Alexei Phedorovich
Dashko Oleg Grigorievich
Krivospitski Yuri Prokopevich
Kutyanin Vladimir Ivanovich
Antares High Tech S.A.
Enad Elvin G.
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