JPS63186544A - Commutator motor - Google Patents

Abstract

PURPOSE:To reduce faulty interconnections, by connecting the winding starting end and the winding final end of a coil to the different terminals of one commutator segment when both ends are connected electrically to the same commutator segment. CONSTITUTION:A commutator motor consists of a rotary shaft 1, to which an armature core 3 wound by an armature coll 2 and a cylindrical commutator 4 are fitted, magnets 5, arranged in a motor case 7, bearing stands 8-9, bearings 10, brush push-up plate 11 and a cooling fan 12. When the coil 2 is connected to the commutator 4, the looped part except the beginning and final ends of winding of the coil 2 is engaged with and held by one of two pieces of segment terminals to conduct a segment while both ends of beginning and ending of the coil 2 are engaged with and held by two pieces of segment terminals differently and are conducted. According to this method, the process of cutting of terminals of the coil may be facilitated.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a motor with a cylindrical commutator.

(Prior art) In a commutator motor, the connection of the armature coil to the cylindrical commutator is connected to each commutator segment of the commutator.
This is done using claw-shaped commutator connection terminals formed in Both ends are 1
Two commutator connection terminals (hereinafter referred to as segment terminals)
was connected to. Therefore, there was a risk that the end portion of the coil would protrude from the segment terminal, resulting in poor connection. This tendency becomes particularly noticeable when cylindrical commutators are used in narrow spaces as motors become smaller.

Furthermore, when a motor has a high voltage specification, it is customary to increase the number of commutator pieces to make it multipolar to take countermeasures against rectification sparks, but if this motor is used as a low voltage specification, the wire diameter Because a thick coil is used, when a coil is connected to a segment terminal (fusing), it may come into contact with the coil of the other pole, causing a short circuit between the coils. On the other hand, in the case of low voltage specifications, the rectification is stable, so the number of poles is small, and the distance between the coil connection to the segment terminal and the other pole can be kept relatively large, so the problem of short circuits between coils is eliminated. Although this problem can be solved, as long as the beginning and end of the coil are connected to the same terminal of one segment, a coil with a large wire diameter may still cause poor connection due to the protrusion of the coil.

(Purpose of the Invention) The present invention has been made in view of the above-mentioned circumstances, and it ensures a strong connection between the commutator pieces at the beginning and end of the winding of the coil, eliminates connection defects, and improves the connection of the commutator pieces at the beginning and end of the winding of the coil. It is an object of the present invention to provide a commutator motor in which a connection portion of a coil to a commutator piece is not short-circuited with a coil of another pole even if the coil is connected to a commutator piece.

(Structure of the Invention) The present invention relates to a commutator motor in which an armature coil is connected to a terminal for armature coil connection provided on each commutator piece of a cylindrical commutator, in which one pole of the commutator piece is A plurality of terminals are provided per armature coil, and the winding start and winding end of the armature coil are separately connected to the terminals.

With this configuration, the connections to the commutator pieces at the beginning and end of the winding of the coil are less likely to protrude, and the connections can be ensured.

(Example) Embodiments of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, an armature iron core 3 around which an armature coil 2 is wound and a cylindrical commutator 4 that supplies rectified current to the coil 2 are removed from the rotating shaft 1. A commutator in which a magnet 5 is fitted and fixed on the outer periphery of an iron core 3, and power is supplied from a brush 6 that is in sliding contact with a commutator 4 to magnetize and rotate the iron core 3 with a rectified current. This consists of a motor.

In addition, in the figure, 7 is the motor case, 8.9 is the bearing stand, and 10 is the motor case.
1 is a bearing that supports the rotating shaft 1; 11 is a brush pushing plate that applies pressing force to the brush 6 via a spring; and 12 is a cooling fan fixed to the rotating shaft 1.

The commutator 4 is mounted on a base 1 as shown in FIGS. 3 and 4.
A plurality of commutator segments (segments) 1 fixed to the outer periphery of 3
4, and two terminals 15 (hereinafter referred to as segment terminals) for connecting the coil 2 are integrally formed on the edge of each commutator piece 14. When manufacturing this commutator 4, a cylindrical body for forming a commutator in which a plurality of protrusions for forming segment terminals 15 are formed is externally fitted onto the base 13 and connected and fixed at the connecting portion 16, By bending the protrusion and further forming insulating grooves 17 with a cutter or the like along lines dividing each segment terminal 15 into two, a plurality of rectifiers each having two segment terminals 15 are formed. A child piece 14 can be formed.

To connect the coil 2 to the commutator 4, as shown in FIG. In addition, as shown in FIGS. 5 and 6, both end portions 19 and 20 of the coil 2 at the beginning and end of the winding are connected to each other of the two segment terminals 15 separately. The engagement is maintained to establish a conductive state.

In this way, both ends 19.2 of the winding start and winding end of the coil are
Since the two segment terminals 15 are separately connected to each other, the connection is reliable and strong, and as is clear from FIG. 6, the cutting process of the ends 19 and 20 is easy.

Moreover, by connecting the wires in this way, even when using a coil with a large wire diameter for low voltage specifications, it is possible to connect both ends of the coil at the beginning and end of the winding to one segment terminal as in the conventional method. It is possible to avoid problems such as a short circuit with a coil of the other pole due to the protrusion of the coil, which sometimes occurs.

In the illustrated embodiment, the iron core 5 has eight poles, the commutator pieces 14 of the commutator 4 have eight poles, and the coil 2 is connected in Δ (delta). In addition, when this motor is used for both high and low voltages and has a high voltage specification, a commutator 4 is used to prevent sparks.
Each commutator piece 14 may be divided into two to provide 16 poles. In this case, the mold for the commutator is shared during manufacturing, and only the number of grooves needs to be changed, which can contribute to reducing manufacturing costs.

In addition, in the case of this high voltage specification, the wire diameter of the coil generally needs to be small, so even if there are multiple poles, short circuits with other pole coils at the connection to the segment terminal are unlikely to occur. It is.

(Effects of the Invention) As described above, according to the present invention, in order to electrically connect the winding start and winding ends of a coil to the same commutator piece, both ends are connected to separate terminals of one commutator piece. Since the two ends of the coil are connected to one terminal of the commutator piece, connection defects due to protrusion of the coil, etc., which occur when the two ends of the coil are connected to one terminal of the commutator piece, are reduced, and a reliable and strong connection is possible. In addition, it is possible to prevent troubles such as short circuits between the other poles at the connection portion, and to provide a commutator motor with fewer failures.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view of a commutator motor according to an embodiment of the present invention, FIG. 2 is a side view of the armature and commutator portion of the motor, and FIG. 3 is a partially broken pressure surface view of the commutator. 4 is a sectional view taken along the line IV--IV in FIG. 3, FIG. 5 is a diagram showing the connection state at the beginning and end of winding of the coil in the motor, and FIG. 6 is an enlarged view of the connection section. 2... Armature coil, 4... Commutator, 14... Commutator piece, 15... Segment terminal, 19... Winding start end, 20... Winding end end. Patent applicant Matsushita Electric Works Co., Ltd. Representative Patent attorney Etsushi Kotani
Patent Attorney Chief 1) Masayuki Patent Attorney Yasuo Itaya Figure 2 Figure 3 Figure 1 ■ Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. In a commutator motor in which the armature coil is connected to a terminal for armature coil connection provided on each commutator piece of a cylindrical commutator, a plurality of terminals are provided per pole of the commutator piece. established,
A commutator motor characterized in that a winding start and a winding end of an armature coil are separately connected to the terminals.