JPS6122548B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a rotor for a small electric machine, consisting of a flat wound sheet metal strip or laminated sheet metal strips and provided with slots. Rotation in which multiple windings are lapped so that one coil piece of each winding made of a single aluminum wire serves as the lower conductor in one slot, and the other coil side serves as the upper conductor in another slot. This relates to a type in which a child winding is attached.

BACKGROUND OF THE INVENTION Numerous electrical machines are known whose slots are designed as open, half-open or completely closed slots for receiving windings. The shape of the slot influences the arrangement of the windings inserted into the slot as well as the shape of the teeth located between the slots.

The slots and the teeth located between the slots are in a predetermined relationship. A winding of a certain cross-section is inserted into the slot and must be protected from ejection, especially in the slot of the rotor. Even in small electric machines, the cross section of the tooth profile must be sufficiently large to ensure the required magnetic flux. With relatively expensive windings made of copper, the winding cross-section may be small, thus leaving a large cross-section of the teeth between the slots.

The object of the invention is to use inexpensive aluminum windings to achieve similar power characteristics as in electrical machines with copper windings, in short the ratio of the winding cross section to the tooth profile cross section, which affects the slot shape. , with the same number of slots or teeth as with copper windings.

Structure of the Invention The gist of the present invention that solves this problem is that each slot has an expansion section extending from the bottom of the slot, which is circular in cross-section, and an edge section following this. The tooth profile formed between the slots has side surfaces extending parallel to each other in an area corresponding to the expansion section of the slot and corresponding to the edge section of the slot. The side of the coil that forms the lower conductor and is inserted into the expansion section of the slot is deformed to a shape that matches the expansion section of the slot, and the coil side that forms the lower conductor and is inserted into the expansion section of the slot is The coil edge forming the upper conductor is inserted into the edge section of the slot.

According to the present invention, in order to obtain a tooth profile cross section that is sufficiently large compared to the slot even in a small electric machine, the tooth profile formed between the slots extends in parallel in the range corresponding to the expanded section of the slot. It has lateral sides and is widened in an area corresponding to the subsequent edge section of the slot.

It is advantageous to insert a lap winding, which is inserted automatically, for example for a starter motor, into a slot formed in this way.

In order that the winding can be inserted into the bottom of the slot which is narrower than the diameter of the winding and the bottom of the slot can be sufficiently filled with the winding, a slot is placed on the side of the coil that forms the lower conductor of the winding. A shape suitable for the expansion section is given. The coil side forming the upper conductor of the winding is inserted into the edge section of another slot.

Advantageously, the slot is coated with an insulating material.

The main advantage of the slot according to the invention is that it allows the use of inexpensive aluminum for the windings. Aluminum requires a relatively large conductor cross-section compared to expensive copper, but the slot shape according to the invention provides a sufficiently large tooth profile cross-section, making it possible to achieve the same results as using copper windings. Output characteristics can be obtained.

Additionally, the windings inserted into the slots may be treated with an impregnating agent to protect them from shorting and erosion. The impregnation treatment increases the effect of preventing the windings from flying out due to rotation of the rotor.

Embodiments Next, the present invention will be specifically explained with reference to illustrated embodiments.

A rotor 1 of an electric machine is provided with a slot 2 in which an insulating paper 3 is covered.
A winding 4 is inserted into this slot 2.
The slot 2 has an expanding section 6 extending from the slot bottom 5 and an edge section 7 following this, the two sides 8 of the edge section 7 being parallel to each other.

A tooth profile 9 is formed between two adjacent slots 2, which tooth profile 9 has mutually parallel sides 10 in the area narrowed by the widening section 6 of the two slots 2, and expands in the area between the edge sections 7 of the two slots 2. The tooth profile 9 thus has a cross-section that is a combination of a square and a trapezoid that subsequently widens towards the edges.

Each winding 4 consists of a single wire. slot 2
Before dropping the winding in, the coil side 11, which serves as the lower conductor, is compressed into the slot 2,
With this, expansion section 6 is almost completed. The coil side 12, which serves as the upper conductor, is dropped into a separate slot above the lower conductor. The drop-in is combined with the impregnating agent treated on the winding 4.
This is done under some degree of pressure so that the rotor does not fly out of the rotor.

The winding 4 consists of an aluminum wire with a circular cross section. Twisting of the aluminum wire does not pose a problem when the coil side 12 forming the upper conductor is dropped in. The round wire is insulating paper 3.
This is because the insulating paper 3 in the slot 2 can be crimped without damaging the insulating paper 3.

A second embodiment of the invention is shown in FIG. In this case, the parts of the rotor 13 that are suitable for the slots 14 are shown in such a way that the slot bottoms 15 are formed with a relatively small mutual spacing. 2 slots 14
Tooth profile 1 in the area between the widening sections 17 of the slots 14 and the edge sections 18 of the two slots 14
The shape of 6 is the same as in FIG. In short, in this case slot 14 is slot 2 in FIG.
The edge section 18 has side surfaces 19 that are parallel to each other. In each slot 14, two windings 20 are wound one over the other. A coil side 21 consisting of two wires, which serves as the lower conductor, is likewise formed in such a way that it fills the slot bottom 15 and at least part of the expansion section 17 before being dropped in. The coil side 22 consisting of two wires serves as the upper conductor.
It is dropped into another slot similar to the embodiment shown.

The slot can also be formed so that three or more windings can be wound in layers.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a first embodiment of the invention, and FIG. 2 is a partial sectional view of a second embodiment of the invention. DESCRIPTION OF SYMBOLS 1...Rotor, 2...Slot, 3...Insulating paper, 5...Slot bottom, 6...Slot expansion section, 7...Slot edge section, 8...Side surface, 9
...Tooth profile, 10...Side part, 11, 12...Coil side, 13...Rotor, 14...Slot, 15
... bottom, 16 ... tooth profile, 17 ... slot expansion section, 18 ... slot edge section, 19 ... side surface, 20 ... winding wire, 21, 22 ... coil side.

Claims (1)

[Claims] 1. Rotor for a small electric machine, consisting of flat-wound or laminated sheet metal strips and having slots 2; 14, one of each winding consisting of a solid aluminum wire. A rotor winding that is lap-wound from a plurality of windings such that one coil side forms a lower conductor in one slot 2;14, and the other coil side forms an upper conductor in another slot 2;14. 4; 20, each slot 2; 14 has an enlarged section 6; 17 extending from the slot bottom 5, 15, which is circular in cross-section, and an edge section 7; 18 following this. and both sides 8, 1 of the edge section 7;
9 extend parallel to each other, and the tooth profile 9; 16 formed between the slots has side surfaces 10 extending parallel to each other in an area corresponding to the enlarged sections 6; 17 of the slots 2, 14. The side of the coil which forms the lower conductor and is inserted into the expanded section 6; 17 of the slot is The expansion section 6; 17 of the slot has been deformed into a shape that is compatible with the winding 4; 20.
A rotor of an electrical machine, characterized in that the coil sides 12, 22 forming the upper conductor of the rotor are inserted into the edge section 7; 18 of the slot.