DE3245400A1 - PERMANENTLY DRIVEN GENERATOR FOR VEHICLES - Google Patents

Description

11/26/1982 Lr / Wl

ROBERT BOSCH GMBH, TOOO Stuttgart 1

Permanently excited generator for vehicles

The "invention relates to an electric, for vehicles specific generator according to the genre of the main claim.

Ss are already flywheels for motorcycles and Small motor vehicles have become known in which the rotor designed as a flywheel has at least two, preferably contains four or more permanent magnets in the manner specified in the preamble of claim 1 are polarized tangentially and in the circumferential direction so that that two consecutive in the circumferential direction Magnets with poles of the same name against one of several soft iron pole pieces, each arranged between two permanent magnets are applied, which are intended to the magnetic flux in the radial direction on fixed, conduct anchors provided with windings.

Generators without slip rings and therefore require little maintenance be manufactured inexpensively in a known manner with permanent magnet excitation. The invention has the task based on creating a permanently excited generator that works with low losses even in partial load operation.

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According to the invention, to solve this problem are those in the characterizing Part of the main claim specified, constructive measures provided.

A particularly cost-effective structure is obtained if the permanent magnets are designed as ferrite magnets.

Very high spin speeds in an inventive internal rotor-rotor with permanent magnets may ^in>: Another embodiment of the invention are achieved when the laminated between two Kraftlinienleitstücken have in their radially directed, located in the rotor axis planes of symmetry cutouts with sawtooth-shaped boundary surfaces, which with a paramagnetic molding - Or press material are filled, which connects the rotor as a whole and at the same time can form the hub of the rotor drawn onto a central drive shaft.

The invention is described below with reference to one in the drawing illustrated embodiment, a permanently excited electrical generator for motor vehicles described in more detail and explained .. show it

Figure 1 shows the inventively designed rotor of the Generator in its axial half-section and

FIG. 2 in a cross section perpendicular to the rotor axis.

The drawing shows a rotor of an electrical machine, in particular a motor vehicle generator, consisting of plane-parallel permanent magnets 1, which are inserted between laminated flux concentrators 2, which act as a force line guide piece, and through die-cast parts 3, h, 5 and 11

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with each other "and with the rotor shaft 6 non-positively and positively are connected. The rotor is supported by the armature U, which is made in the shape of a fir tree and made of paramagnetic die-cast material, and by the locking pieces 3 in the pole gaps and through the end-face annular caps 11, are cast onto the fan blades 10, held together.

In the case of a permanent magnet rotor, as described above, the position of the magnets on the radial or at an acute angle to the radial can accommodate a maximum of flux-generating magnetic surface with sufficient magnet thickness. This is particularly important when using the very inexpensive ferrite magnetic materials with remanence inductions of 0,! + R 0, UU T. For "rare earth" magnets with 0.8 τ 1.2 T, the area in the machine's air gap is usually sufficient. With this arrangement, however, great fastening problems occur with the magnets in high-speed electrical machines.

T is the international unit for induction B. (Old Unity was Gauss.)

1 T »10 KG = 1 -.

For ferrites, B = 0, U f 0, UU T is an excellent value.

Usually GRP bandages or anti-magnetic Steel cylinder used to fix the parts. In both cases there is an enlargement of the air gap which reduces the flow despite great manufacturing effort.

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The presented rotor design does not have these disadvantages. The stacked flux concentrators 2, which can be easily produced as stamped sheet metal parts, extend up to the constructive air gap and, if necessary, can be turned over or over reeds after being encapsulated with die-cast aluminum. Both the flux concentrators and the magnets are held by the formation of the pine-cone-shaped tie rods h and by the cast caps 11- adjoining the laminated core on both sides. The mechanically very hard magnets are prevented from breaking apart even in the case of hidden cracks by the also cast-on locking pieces 3, whereby a. Destruction of the entire machine is prevented. The blades 10 for radial fans can advantageously be cast immediately onto the caps 11. By suitably designing the air gap contours of the stamped flux concentrators, which are easy to manufacture, the shape of the electrical voltage output by the electrical machine can advantageously be influenced. The rotor ball is attached to the shaft by means of a knurl T on the shaft 6 and by caulking 9, which displaces the die-cast compound into the grooves 8 in the shaft 6.

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Claims (3)

• ft ft R. I82U9 11/26/1982 Lr / Wl ROBERT BOSCH GMBH, 7OOO Stuttgart 1 Expectations C 1.y Electric generator for vehicles, in particular Motor vehicles, with a multi-pole, in the Statorboh- - A laminated stator core carrying several alternating current windings revolving around the rotor, the at least Contains two permanent magnets, which are polarized tangentially in the circumferential direction of the rotor and on their pole faces against force line ducts, from which the lines of force emerge radially and enter the stator core, characterized in that the permanent magnets (1) designed as low prismatic disks and with their disk surfaces essentially radial are aligned. 2. Generator according to claim 1, characterized in that the permanent magnets (1) are designed as ferrite magnets. 3. Generator according to claim 1 or 2, characterized in that the laminated power line guide pieces (2) are cutouts (^) with sawtooth-shaped boundary surfaces included. k. Generator according to claim 3 »characterized in that the cutouts (k) are filled with paramagnetic die-cast material and are connected to the magnets (1). SAD