Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1985-03-28
1987-01-06
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310156, 310257, H02K 3700
Patent
active
046349065
DESCRIPTION:
BRIEF SUMMARY
This invention relates to multiphase motors, the rotor of which has N pairs of poles with axial magnetization.
Different types of motors with magnetized rotors exist. According to the present invention the magnetization axes of the rotor is parallel to the rotation axis of the rotor.
A principal object of the invention is to create a multiphase motor with a high efficiency by using existing materials, and which is easily 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 conception. Subsidiarily, the invention also has as its object to create a multiphase motor which can easily be adapted to the stepping mode.
The field of applications of the motor according to the 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 size output power and speed constitute critical criteria.
One embodiment of the motor according to the invention and two variants are represented schematically and simply by way of example in the drawings in which:
FIG. 1 is a view of that embodiment in the direction of the rotation axis of the rotor;
FIG. 2 is a plan view of its stator;
FIG. 3 is a plan view of its rotor;
FIG. 4 is a perspective view of this rotor;
FIG. 5 is a view similar to that of FIG. 4, but relating to the first variant;
FIG. 6 is a plan view of a piece of the second variant;
FIGS. 7 and 8 are linear unrollings of the motor which illustrate its mode of operation.
The motor represented in FIGS. 1 to 4 has a rotor 1 provided with a number N of pairs of poles equal to eight. The number m of the phases of this motor is equal to two. Moreover, the shifting between these two phases is equal to 2.tau./(N.multidot.m).
The rotor 1 is of ferromagnetic material such as samarium-cobalt, the coercive force of which is high and the specific mass small. It has eight pairs of poles, the magnetization axes of which are parallel to the rotation axis of the rotor, but alternately in opposite directions, and they are regularly arranged around that axis.
The rotor 1 is mounted opposite a stator 2 which forms two phases r and s. Each phase r, s comprises two polar pieces 3, 4 coplanar, interpositional in one another, piece 3 being within piece 4. The two polar pieces 3, 4 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 6 (FIG. 1) which are designated by p.sub.1, p.sub.2, . . . , p.sub.9 in FIG. 2 to facilitate the explanation.
FIG. 2 shows that the poles p.sub.1, p.sub.3 of polar piece 4 of phase r, the poles p.sub.2, p.sub.4 of polar piece 3 of this same phase r, poles p.sub.6, p.sub.8 of polar piece 4 of phase s and pole p.sub.7 of this same phase s have, each one, 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 angular extensions of these two fractional poles is at least approximately equal to the angular extension of a full pole.
In the general case of a motor with m phases, the rotor of which has N pairs of poles, the poles of the polar pieces of m-1 phases and those of one polar piece of the mth phase are full; they are 1/2 N/m in number per polar piece and they are arranged at an angular interval at least approximately equal to twice that between the pairs of adjacent poles of the rotor. Regarding the poles of the remaining polar piece, there are (1/2 N/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 resp
REFERENCES:
patent: 3989967 (1976-11-01), Kikuyama et al.
patent: 4075540 (1978-02-01), Torisawa
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), Sudlek
patent: 4558244 (1985-12-01), Nikaido et al.
Rebsch D.
Salce Patrick R.
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