Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1985-03-28
1987-07-14
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 49R, 310257, H02H 3700
Patent
active
046804943
DESCRIPTION:
BRIEF SUMMARY
This invention relates to multiphase motors with facially magnetized rotors having on each one of its two faces N/2 pairs of poles.
According to the rotor magnetization it is possible to define several types of motors.
A first type is that for which the rotor has N pairs of poles, these pairs being defined, for instance, by magnetization axes which are parallel to the axis of rotation of the rotor, so that the latter has N poles on each one of its two faces. This rotor is referred to as axially magnetized.
A second type is that for which the rotor has, on each one of its two faces, N/2 pairs of poles, these pairs being defined, for instance, by magnetization curves which are contained in planes parallel to the axis of rotation of the rotor, so that the latter also has N poles on each one of its two faces. This rotor is referred to as facially magnetized.
The motor according to the invention essentially belongs to this second type.
A principal object of the invention is to provide a multiphase motor having optimum efficiency by using existing materials, and which can be manufactured by industrial processes, the number of phases thereof as well as the basic range of powers being very extensive, without modifying the motor concept. Another object of the invention is to provide a multiphase motor which can easily be adapted to the stepping mode.
The field of application of the motor according to the present invention is thus very large. This motor can be used, for example, in driving systems for office automation, robots, aeronautical and space industry, photographic innstallations, 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 wherein size, efficiency, power and speed are determining criteria.
One preferred embodiment of the motor according to the invention and two variants are represented diagrammatically and simply by way of example in the drawings in which:
FIG. 1 is a view of a motor according to the present invention in the direction of the axis of rotation of the rotor;
FIG. 3 is a sectional view illustrating how the stators are positionned;
FIG. 4 is a sectional view illustrating the rotor assembly;
FIG. 5 is a perspective view of the rotor of the first variant;
FIG. 6 is a plan view of a piece of the second variant;
FIGS. 7 and 8 are linear unrolled views which illustrate the mode of operation of the present invention.
The motor represented has a rotor 1, each one of the two faces of which has a number N of poles equal to eight. The number m of the phases of this motor is equal to two. Moreover, the phase shift of these two phases is equal to 2.pi./Nm.
The structure of this motor is particularly illustrated in FIG. 2, and FIG. 1.
Rotor 1 is of ferromagnetic material such as samarium-cobalt, the coercive force of which is high and the specific mass small. Each one of its two faces has N/2 pairs of poles. On each face, these poles are regularly distributed around the axis of rotation of the rotor and they have alternate opposite polarities. Moreover, the poles of one face are located opposite the poles with the same polarity on the other face.
A stator is mounted opposite each face of the rotor: a first one a and a second one b. The stators a, b form two phases r and s. Each phase r, s comprises two polar pieces 2, 3 being coplanar with each one of the two stators a, b. The two polar pieces 2, 3 of each phase r, s of stator a have the same shape, respectively, as the two polar pieces 2, 3 of each one of the two phases r, s of stator b. Moreover, in the view of FIG. 1, the polar pieces 2, 3 of stator b are superimposed over the polar pieces 2, 3 with the same shape of stator a.
The two coplanar polar pieces of each one of the two phases r, s of each stator a, b are interpositioned, one in the other, piece 2 being within piece 3. Furthermore, these two pieces 2, 3 are separated from one another, by a sinuous air-gap 4. Each phase thus has two pairs of polar pieces having the same
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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: 4455499 (1984-06-01), Sudler
patent: 4558244 (1985-12-01), Nikaido et al.
Rebsch D. L.
Salce Patrick R.
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