Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1987-08-06
1989-09-12
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310114, 310156, 310162, 310179, H02K 122
Patent
active
048663239
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a synchronous electric motor comprising a least one rotor part of essentially flat annular form, magnetised so as to present at least one series of magnetic poles disposed regularly along a planar annular zone, the said rotor part being fixed by means of at least one rotor-supporting part on a motor shaft mounted to be rotatable relatively to at least one stator assembly, the stator assembly comprising at least two stator parts of a magnetically permeable material, these forming, being fast with or being coupled with pole parts arranged so as to form, in their assembly, a variable air gap along at least one portion of an annular space in which are disposed the magnetic poles of the rotor part, the stator assembly comprising, in addition, at least one electric control coil coupled with one or several of the said pole parts. Such a motor is described, for example, in International Patent Application No. WO 85/02503.
The invention has for its object to provide a motor of the aforementioned type, of which the conception, while using usual elements such as standard ball bearings for the mounting of the motor in relation to the stator assembly, facilitates the fabrication of this motor, particularly at the time of assembly, and makes it possible to achieve in a simple and economic fashion a very good precision in the positioning of the rotor part with respect to the stator assembly.
To this end, the motor according to the invention is characterised in that the fixing of the rotor part on the rotor-supporting part is effected in such manner as to permit, when assembling the motor, a positioning of the rotor part in the axial direction and also an angular positioning of this latter relatively to the direction of the motor axis.
Preferably, the stator assembly comprises separate stator parts which form part of a same magnetic circuit, the stator assembly being arranged so as to permit, at the time of assembling the motor, a positioning of the stator parts relatively to one another in the axial direction. In this case, the stator parts which form part of a same magnetic circuit may be interconnected, directly of by means of a yoke part, so as to form a magnetic joint constituted by contact surfaces parallel to the axis of the motor shaft. More particularly, the stator assembly may be formed by two coaxial annular stator parts of like form, each having at least one first and one second cylindrical wall portion, the internal diameter of the first wall portion being equal to the external diameter of the second, the two stator parts being joined in such manner as to be fitted one within the other by the said respective first and second wall portions.
The invention is more particularly applicable to a motor in which the rotor part is present in the form of an annular disc of small thickness with respect to its external diameter and is magnetised axially, and the stator assembly comprises pole parts disposed on both sides of the rotor part.
Preferably, the stator assembly and/or the rotor supporting part comprise at least one access opening communicating with the air space between the rotor part and the pole parts, this opening being accessible from outside the stator unit assembled with the motor shaft provided with the rotor part.
The invention also has for its object a method of fabricating such a motor, in accordance with which, first of all, the motor shaft provided with the rotor-supporting part is assembled with an assembly of pole parts which have to be disposed facing a corresponding flat annular zone of the respective rotor part, in such manner that the ends of these pole parts, in the axial direction, are disposed in a plane perpendicular to the axis of the motor shaft, that the annular rotor part is placed in position by disposing at least one spacer element of a determined thickness between the latter and the ends of at least one part of the said pole parts, that the rotor part is fixed on the rotor support and that the spacer part is withdrawn or removed from the space betwee
REFERENCES:
patent: 2797346 (1957-06-01), Ranseen
patent: 3176380 (1965-04-01), Wightman
patent: 3469123 (1969-09-01), Inaba et al.
patent: 4330727 (1982-05-01), Oudet
patent: 4517478 (1985-05-01), Oudet
patent: 4658166 (1987-04-01), Oudet
patent: 4682067 (1987-07-01), Oudet
Drey Gilbert
Oudet Claude
Veignat Norbert
Portescap
Skudy R.
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