Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-07-19
1992-11-10
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 310 91, 310218, 310261, H02K 2112
Patent
active
051626861
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a rotor for a motor having magnets and it applies in particular to providing a synchronous motor having permanent magnets.
One of the major problems encountered in providing motors having magnets is the problem of fitting together the laminations and the magnets and of fitting them all on the shaft of the motor. The fixing must be robust in order to withstand various types of mechanical stress (forces due to the centrifugal effect, transmitting torque between the rotor and its shaft).
In addition, the type of fixing used must be cheap and must also lead to short assembly times.
The present invention provides a rotor for a motor having magnets, the rotor comprising a rotary shaft and at least one pair of magnetic poles with magnets disposed therebetween having azimuth magnetization, the rotor being characterized in that the poles and the magnets are fixed to each other and to the rotor by a section member of constant thickness having a section with as many lobes as there are poles in the motor, said lobes being interconnected in pairs by curved portions which are substantially circular arcs of diameter close to that of the shaft of the motor.
Advantageously, said section member is made of a material selected from the group comprising: aluminum alloys, copper alloys, austenitic stainless steel, glass fiber, and carbon fiber.
In a particular embodiment, the laminations of the rotor are assembled by means of end plates clamped together by threaded rods provided with nuts.
In a variant, the laminations of the rotor are assembled by means of end plates clamped together by smooth rods provided with grip rings.
In another variant, the laminations of the rotor are assembled by means of end plates clamped together by rivets.
Means may be provided for reinforcing the section member, e.g. steel split tubes engaged in the lobes thereof.
The invention will be well understood from the following description of a preferred embodiment of the invention given with reference to the accompanying drawings, in which:
FIG. 1 is a cross-section through a rotor of the invention on a plane perpendicular to its axis of rotation;
FIG. 2 is an axial half-section through a rotor whose components are assembled by means of threaded rods;
FIG. 3 is an axial half-section through a rotor whose components are assembled by rivets;
FIG. 4 is an axial half-section through a rotor whose components are assembled by smooth rods associated with grip rings; and
FIGS. 5 and 6 show how the rotor laminations are mounted on the section member.
The chosen example is a four-pole motor.
In FIG. 1, reference 1 designates a shaft having four magnetic poles laminations or pockets 11, 12, 13, and 14 including holes 81, 82, 83 and 84 disposed thereabout, the poles being made up of cutout magnetic laminations which are clamped together by means described below. Permanent magnets 21, 22, 23, and 24 are placed between the laminations, with the magnetization of the magnets being azimuth magnetization, i.e. perpendicular to the axis O of the shaft and to radii extending therefrom. Any pair of adjacent magnets face each other via poles of the same name, i.e. North (N) or South (S).
The magnets are disposed in housings lying between the laminations. They are held radially by polar extensions of the poles such as those referenced 11A and 11B for the pole 11.
The magnet and pole assembly is fixed by means of a section member 30 which is preferably made of non-magnetic material, e.g. selected from the group constituted by aluminum alloys, copper alloys, austenitic stainless steel, glass fiber, and carbon fiber. The section member fits round the shaft 1. It is of constant thickness and is in the form of four almost-closed circular lobes 31, 32, 33, and 34. The lobes are interconnected in pairs by circular arc portions having the same diameter as the shaft. These portions referenced 41, 42, 43, and 44 come into close contact with the shaft.
FIG. 2 shows one way of fixing the laminations in which threaded rods 51 are inserted inside the lobes
REFERENCES:
patent: 2043010 (1936-06-01), Reis
patent: 3979821 (1976-09-01), Noodleman
patent: 4445062 (1984-04-01), Glaser
patent: 4663551 (1987-05-01), Weh et al.
patent: 5091668 (1992-02-01), Cuenot et al.
GEC Alsthom SA
Skudy R.
LandOfFree
Motor rotor having magnets does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Motor rotor having magnets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor rotor having magnets will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2296161