KR970006110B1 - Commutator connection method in an electric motor and dc electric motor - Google Patents

Abstract

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Description

How to connect the commutator in a fractional horsepower DC motor motor and a fractional horsepower DC motor motor

1 is an exploded perspective view of a fractional horsepower permanent magnet direct current (PMDC) motor according to the present invention.

FIG. 2 is a side view of the armature of the motor of FIG. 1 before connecting the armature coils and the commutator pieces in hot forging. FIG.

3 and 4 are partially enlarged views of FIG. 2 showing a hot forging process.

* Explanation of symbols for main parts of the drawings

1: motor 2: case

3: End Cap 4: Permanent Magnet

5: bearing 6: brush gear

7: Brush Leaf 9: Motor Terminal

10: bearing 11: rotor

12 axis 13 armature

16: base 18: coil

19: arm 20: wire

21: Tang 22: Solder

23: primary electrode 24: secondary electrode

25: lower jaw

The present invention relates to a method of connecting a commutator piece to a wire of a coil wound armature coil in a fractional horsepower direct current motor and a fractional horsepower direct current motor.

The connection between the commutator piece and the armature coil wire has been connected using a hot forging process. Tang is configured on the commutator side to bend to surround the wire or to be hooked. When the electrode comes down on the ring and bends the ring on the commutator piece, a wire is caught between the commutator piece and the ring. When another electrode presses the commutator piece and current flows between the electrodes to heat the ring, pressure and heat forge the free end of the ring on the commutator piece and stick between the end of the ring and the commutator piece. Contact. Since the insulating resin coating of the wire burns out during the hot forging process, electrical contact is made between the wire, the commutator piece and the ring.

In this type of fractional horsepower motor the electrical resistance of the motor is important. Therefore, the electrical resistance of the electrical connections at the motor must be kept to a minimum. When hot forging large diameter wires, the resistance between the wire-to-piece connections increases to an unacceptable level in use. Even if a large diameter wire is attached to the ring, the centrifugal force acting on the wire and the motor are heated. Due to the different expansion due to cooling, the mechanical connection eventually becomes loose, which in turn degrades the electrical connection.

It is known to annotate the commutator side in advance before hot forging. The reason for this is not clear, but there is not enough improvement to connect large diameter wires, and there is a problem that the tin must be removed from the brush contact surface of the commutator before using the commutator.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to provide a fractional horsepower DC electric mower that enables a low resistance electrical connection by making a safe mechanical junction to maintain a low resistance during the useful life of the motor. It is to provide a method of connecting the commutator on the site.

Another object of the present invention is to provide a fractional horsepower DC electric motor made using such a connection method.

A feature of the present invention is a method of electrically connecting a wire of a commutator coil and a wound armature coil in a fractional horsepower DC electric motor, the method of hot forging a ring of the commutator piece to wrap the wire, and solder (Solder) Of pieces of commutator in direct current motors where the pieces are placed adjacent to the rings and wires, and during the forging process, the solder contacts the soldered parts of the wires in contact with the rings and at least fills the gaps that may form between the wires and the rings. It is in the connection method.

Another feature of the invention is that the housing has a stator and brush gear attached to the housing, a rotor rotatably attached to the housing, and is rigidly attached to the shaft and the wound armature coil and the shaft. Upper rectifier, which is composed of segments on an insulating base, each segment having a ring, wherein the wire of the armature coil is connected to the ring and the wire during forging. A fractional horsepower DC electric motor connected to the commutator piece by a hot forging process in which solder pieces are formed adjacent to each other and a solder layer is formed around the connected wires and the solder fills at least some gaps formed between the wire and the ring. It is.

The invention applies in particular when the size of the wire is larger than the size of the ring of the commutator piece.

When described in detail with reference to the accompanying drawings an embodiment of the present invention.

1 is an exploded perspective view of a fractional horsepower PMDC motor, the structure of which is generally well known in the art, and thus will be described briefly here.

The motor 1 has a housing consisting of a deep drawing can-shaped steel casing 2 and a plastic end cap 3. The casing 2 has two permanent magnets 4 and one bearing 5.

The end cap (3) has a brush gear (6) that is an elastic brush piece (7), the brush piece being attached to one end and the other end inside the end cap (3). Have The motor terminal 9 extends through the end cap 3 from the brush pieces 7 and is connected to a power source (not shown). The second bearing 10 is attached in the end cap 3.

The rotor 11 of the motor consists of a shaft 13 journaled to bearings 5 and 10 and having a coiled armature 13 and a commutator 15. The commutator piece 15 is in a combined form and consists of a plastic base 16 to which a conductive copper piece 17 is attached. Such commutated commutators are well known in the art.

2 is a side view schematically showing the upper half of the rotor 11 of the motor 1.

The illustrated commutator consists of pieces 17 firmly attached to the cylindrical base 16, each piece 17 being enclosed at an angle slightly less than 120 ° around the axis 12. The armature 13 consists of three coils of insulated resin sheathed wire, each coil 18 having an individual mushroom-shaped arm 19 (radial cross-section of the support) which is firmly attached on the shaft 12. (When we saw). The electrical connection between the coil 18 and the corresponding commutator piece 17 is adjacent to the piece 17 by grasping the wire 20 positioned in the ring 21 portion as a ring as the wire passes from one coil to another coil. Completely formed at the end. At the beginning and end of the coil winding, the ends of the wire are clamped through a common loop that holds these ends firmly.

The ring 21 is bent using a hot forging process that is well known in the art, such that the wire 20 is secured in mechanical and electrical connection with the pieces 17. 3, the solder 22 is placed below the ring 21 adjacent to the wire 20. As shown in FIG. Conveniently, the length of the solder wire may be maintained at the lower free end of the ring 21 adjacent to the wire 20.

The connection is then made by hot forging.

4 shows a hot forging process used in the art. The rotor is supported like a ring 21 to be forged from the top on a nest or the like (not shown).

The primary (positive) electrode 23 is shown in contact with the piece 17.

The secondary (negative) electrode (schematically represented by 24) tucked into the lower jaw 25 descends onto the ring 21 and presses the ring on the corresponding piece 17 (FIG. 3) to allow the wire 20 to be removed. It is slightly distorted and caught in the ring.

When a voltage is applied to the electrodes 23 and 24 and a current flows in the ring 21 and the piece 17, heat is generated in the vicinity of the ring and the wire 20. The heat generated is enough to burn the insulating coating on the wire, thereby making electrical contact with the wire 20 and adjacent portions of the collar and piece 17. At the same time, the solder 22 melts and flows around the wire 20 at the portion hung by the hot ring 21.

Solder, which forms a close electrical contact between wire 20 and ring 21, fills any holes between the wire and the ring, thus forming a secure mechanical connection that prevents the wire tied to the ring from moving. In order to forge the remaining wire-piece connection, the rotor is rotated about the shaft 12 so that the ring is at the top.

Using this process and the piece of solder 22 results in a safe mechanical bond, especially to maintain low resistance during the useful life of the motor, thereby providing a more reliable low resistance electrical connection between the commutator piece and the wire.

The present invention can be applied to commutator pieces of various types and shapes for connecting wires and commutator pieces using hot forging. In these various types of commutators, the ring may be configured on the commutator piece to hook the wire, or in the appropriate portion of the brush plate in contact with the commutator surface.

Various modifications may be made to the processes and products of the present invention, and such modifications will be included in the claims.

Claims (9)

A method of electrically connecting a commutator piece and a wound armature coil wire in a fractional horsepower electric motor, wherein the piece of solder is placed adjacent to the ring and the wire by hot forging the loop of the commutator piece. And a portion of the wire in contact with the ring by recording the solder during the forging process is coated. 2. The method of claim 1, wherein the solder substantially covers the entire surface of the portion where the wire is caught by the ring. The method of claim 1 or 2, wherein the length of the solder wire is at its free end adjacent the wire and the ring. The housing (2) (3), the stator (4) and brush gear (6) attached to the housing (2) (3), and the rotor (11) attached to the housing (2) (3) so as to be rotatable. And an armature coil 13 wound around the shaft 12 and a commutator 15 rigidly attached to the shaft 12, the commutator 15 being composed of pieces 17 on the insulating base 16. A fractional horsepower direct current electric motor 1 having each piece 17 having a ring 21, the wire 20 of the armature coil 18 being forged with a ring 21 and a wire 20. A piece of solder 20 is placed adjacent to and a solder layer is formed around the connected wire, and the commutator piece is formed by a hot forging process in which the solder fills at least some gaps formed between the wire 20 and the ring 21. A fractional horsepower DC electric motor, characterized in that connected to. 5. The electric motor according to claim 4, wherein the solder coating is applied over the entire circumference of the portion where the wire (20) is caught by the ring (21). The electric motor according to claim 4 or 5, wherein the commutator (15) is an assembled commutator composed of a plurality of commutator pieces (17) joined on a plastic base (16). 5. The electric mower according to claim 4, wherein the housing is made of a can of steel, which is dip-drawn, and a permanent magnet (4) (5) of which the stator is attached to the inside of the casing. foundation. Fractional horsepower direct current electric motor in which the wire 20 of the armature coil 13 is electrically connected to the commutator piece 17 by a ring 21 hot forged against the wire 20 so as to enclose the wire 20. A fractional horsepower DC electric motor, wherein a wire 20 in an area enclosed by a ring is covered with a circumference of a solder layer that fills at least some gaps formed between the wire 20 and the ring 21. A stator and brush gear mounted to the housing, a rotor including a shaft and rotatably mounted to the housing, a wound armature coil, and a commutator rigidly attached to the shaft, the commutator being insulated Each condition comprising pieces (segments) on the base and having a forged ring around the wire of the armature coil with a brazing layer is provided between the wire and the ring, the soldering being at least some gap between the wire and the ring. Fractional horsepower electric motor to fill the air.

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