Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1985-03-22
1986-12-16
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 49R, 310156, H02K 3700
Patent
active
046299246
DESCRIPTION:
BRIEF SUMMARY
This invention relates to multiphase motors with magnetized rotor having N/2 pairs of poles at its periphery.
Different types of motors with magnetized rotor exist. According to the present invention the pole pairs of the rotor can be defined by magnetization curves contained in a plane perpendicular to the axis of rotation of the rotor so that the latter has N poles of alternate opposite polarity at its periphery.
A principal object of the inventions to create a multiphase motor having high efficiency by using existing materials, which is easily to be manufactured by industrial processes and the phase number of which, as well as the range of powers, can be very extensive without modifying the motor concept.
The field of applications of the motor according to the present invention is thus very large. This motor can particularly be used with driving systems for office automation, robots, aeronautical and space industry, photographic installations and, time-keepers. More generally, the motor according to the present invention is suitable to all the systems using digital techniques, and, more particularly, to all those with which cumbersomeness, output power and speed constitute critical criteria.
One embodiment of the motor according to the invention and two variants are represented diagramatically and simply by way of example in the drawings in which:
FIG. 1 is a view of that embodiment in the direction of the axis of rotation of the rotor;
FIG. 2 is an exploded perspective view of the essential pieces of that embodiment;
FIG. 3 is a plan view and
FIG. 4 a perspective view of a piece of the variant and
FIGS. 5 and 6 are equivalent diagrams of the motor illustrating its mode of operation.
The motor represented in FIGS. 1 and 2 has a rotor 1 provided with a number N of poles equal to eight. The number m of its phases is equal to two. Moreover the shifting between these two phases is equal to 2.pi./Nm, i.e. 22.5.degree..
The rotor 1 is of ferromagnetic material such as samarium-cobalt, the coercive force of which is high and the mass small. It has four pairs of poles at its periphery which can be defined by magnetization flux lines contained in a plane perpendicular to the axis of rotation of the rotor. At its periphery, the latter thus has eight poles of alternate opposite polarity, which are regularly distributed.
The rotor 1 is surrounded by a stator 2, the poles of which are concentric to the rotor. This stator comprises a number m of phases (r, s) equal to two. Each phase comprises two polar pieces 3, 4 interleaved in one another. They are separated from one another by a sinuous air-gap 5 in each phase.
The polar pieces 3, 4 are of ferromagnetic material having a small coercive force and a high saturation induction. They have poles p.sub.1, p.sub.2, . . . p.sub.9.
FIG. 1 shows that poles p.sub.1, p.sub.3 of polar piece 4 of phase r, poles p.sub.2, p.sub.4 of polar piece 3 of the same phase r, poles p.sub.6, p.sub.8 of polar piece 4 of phase s and pole p.sub.7 of polar piece 3 of this phase s each have, the same arc. These different poles are called full poles, whereas poles p.sub.5 and p.sub.9 of polar piece 3 of phase s are fractional poles. The sum of the arcs of these two fractional poles is at least approximately equal to the arcs of a full pole.
In the general case of a motor with m phases, and N rotor poles, the poles of phases polar pieces of m-1 and those of one polar piece of the mth phase are full; they are 1/2N/m in number per polar piece and they are arranged at an angular interval at least approximately equal to twice that between two adjacent poles at the perihery of the rotor. As regards the poles of the remaining polar piece, there are (1/2N/m)-1 which are full, whereas the m remaining poles are fractional, the sum of their arcs being at least approximately equal to the arc of a full pole.
With the embodiment represented, one of the phases r, s is displaced with respect to the other one through an angle .alpha..sub..gamma. of 22.5.degree.. In the general case of a motor with m phases, the
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patent: 4207483 (1980-06-01), Baer
patent: 4336471 (1982-06-01), Plancon
patent: 4355252 (1982-10-01), Lechner et al.
patent: 4455499 (1984-06-01), Sudler
patent: 4558244 (1985-12-01), Nikaido et al.
Rapport De Recherche Internationale PCT/CH 84/00112.
Rebsch D. L.
Salce Patrick R.
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