JP4298092B2 - Motor rotor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor rotor, and more particularly to a motor rotor characterized by neutral point processing in Y-connection.
[0002]
[Prior art]
Conventionally, Y-connection is used as a method for connecting coils wound around a rotor of a motor. FIG. 4 shows a rotor 10 of a conventional motor in which coils are connected by Y connection. As shown in FIG. 3, the rotor 10 has a rotating shaft 22 inserted through the core iron core 14, and is further resin-molded to form iron core insulating portions 28 at both axial ends of the core iron core 14 and the inner periphery of the slot 24. A rotor base 18 is provided, the coil 16 is accommodated in a slot 24 of the rotor base 18, and the commutator 12 is attached to a commutator sleeve 26. The commutator 12 is provided with a commutator riser 20.
[0003]
The coil 16 is configured by winding a conductive wire around the core iron core 14 and connecting the conductive wires 16a to 16c by Y connection. That is, one end of each of the conductive wires 16 a to 16 c is connected to a predetermined commutator riser 20, and the other ends are connected together to form a neutral point 36. Here, the lead line 36a in the vicinity of the neutral point 36 is a close line.
[0004]
Further, on the outer peripheral side of the tooth 28a in the iron core insulating portion 28, a connection attaching portion 32 that sandwiches the lead wire 36a of the neutral point 36 is integrally provided by resin molding. Specifically, the connection attaching portion 32 includes a pair of flat plates 32a and a reinforcing wall 32b provided so as to form an L shape with respect to the flat plate 32a, and a gap formed between the flat plates 32a ( The neutral point 36 is fixed to the rotor 10 by sandwiching the lead wire 36a between the slits T), and the winding start positions for winding the conductive wires 16a to 16c by Y connection are set.
[0005]
Here, when the coil diameter of the coil 16 (the conducting wires 16a to 16c) is changed in accordance with the change of the motor specification, the following problem occurs. For example, when the diameter of the coil 16 is increased, the diameter of the lead wire 36a of the neutral point 36 is larger than the width in the gap T, and the lead wire 36a does not fit in the gap T and cannot be clamped. Therefore, it cannot be held as the winding start of the Y connection. Even if it can be clamped, there is a possibility that an excessive clamping force is applied to the lead wire 36a and the coil 16 is disconnected. On the other hand, when the diameter of the coil 16 (the conducting wires 16a to 16c) is made small, the lead wire 36a fits in the gap T but cannot be held, and the neutral point 36 cannot be held when the coil 16 is wound. .
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and provides a rotor for a motor that can easily maintain a neutral point according to a change in coil diameter in a rotor for a motor having a Y connection. The purpose is that.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a rotor of a motor according to claim 1 includes a core iron core provided on a rotary shaft and formed with a plurality of teeth in a radial direction, a coil wound around the core iron core by Y connection, An insulating portion provided in the core iron core for insulating between the coil and the core iron core, and the insulating portion provided integrally with the insulating portion at positions corresponding to the teeth, and the coil by Y connection And a connection attachment portion having a gap for holding the lead wire at the neutral point and having a different width for each tooth.
[0008]
According to the configuration of the first aspect, the coil is wound around the core core of the rotor of the motor by Y connection. And the coil winding start position to a core iron core is fixed when the neutral point of the coil by Y connection is pinched | interposed into the clearance gap between the connection attachment parts provided in the insulation part. Moreover, the connection attachment part is provided in the position (for each tooth) corresponding to each tooth of the core iron core. In the plurality of connection attachment portions, the gaps have different widths. Therefore, for example, when manufacturing motors having different specifications with different coil diameters, the widths of the gaps of the connection attachment portions are made different in advance so as to correspond to a plurality of types of expected coil diameters. As a result, the neutral point can be maintained for any of the coils. Therefore, it is not necessary to prepare a plurality of types of connection attachment portions (or molds for forming the connection attachment portions) according to different coil diameters, and manufacturing management is simplified.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment according to the present invention will be described with reference to the drawings.
In addition, since the basic structure of the rotor of the motor of the present invention is the same as that described in the prior art, the same components are denoted by the same reference numerals and description thereof is omitted.
[0012]
The rotor 10 of the present embodiment is a three-phase type, and as shown in FIGS. 1 and 2 (P view of FIG. 1), a commutator 12, a core iron core 14, and a conductor 16a constituting a coil 16. ˜16c and the rotor base 18. The rotor base 18 is a part that serves as a base for arranging the constituent parts of the rotor at predetermined positions around the rotation shaft 22, and is a resin-made core insulation part integrally formed on the core core 14 on the surface. 28.
[0013]
The three conducting wires 16a to 16c wound around the core iron core 14 are connected by Y connection and have a neutral point 36 connected together at one end, and the lead wire 36a in the vicinity of the neutral point 36 is a side line. Has been. Here, the three conducting wires 16a to 16c have the same coil diameter.
[0014]
Further, on each outer peripheral side of the three teeth 28a to 28c in the iron core insulating portion 28, a connection attaching portion 32 capable of sandwiching the lead wire 36a of the neutral point 36 is integrally provided with resin. Each connection attaching portion 32 has a pair of flat plates 32a and a reinforcing wall 32b provided so as to form an L shape with respect to the flat plate 32a, and gaps X, Y and Z are provided between the flat plates 31a. Each is formed. The lead wire 36a of the neutral point 36 is sandwiched between any one of the gaps X, Y, and Z, thereby fixing the rotor 100 to the winding start position of the Y connection.
[0015]
Here, the gap X will be described as an example. As shown in FIG. 2, a holding part 32 c formed between a pair of flat plates 32 a and a guide part 32 d connected to the holding part 32 c are formed. A substantially Y-shaped slit is formed by the sandwiching portion 32c and the guide portion 32d. That is, the guide part 32d is tapered and guides the lead wire 36a when holding the neutral point 36. And the lead wire 36a is clamped by the slit between the clamping parts 32c. Here, the gap X corresponds to a predetermined coil diameter, and has a width dimension that can sandwich the lead wires 16a to 16c, that is, the lead wire 36a.
[0016]
Next, the gap Y and the gap Z will be described.
The gap Y and the gap Z are formed by a clamping part 32c formed between the pair of flat plates 32a and a guide part 32d connected to the clamping part 32c. A character-shaped slit is provided, and the same structure as the gap X is formed.
[0017]
Here, the width dimension of the gap Y is set slightly larger than the width dimension of the gap X. The width dimension of the gap Z is set slightly larger than the gap Y. That is, the width dimension relationship between the gap X, the gap Y, and the gap Z is set to X <Y <Z, and is set to a different dimension.
[0018]
Therefore, for example, when manufacturing motors having different specifications with different coil diameters (when it is necessary to change the diameters of the conductive wires 16a to 16c), the widths of the gaps of the connection attachment portions 32 are set to a plurality of expected types. By keeping the width dimensions of the gaps X, Y, and Z so as to correspond to the coil diameter of X <Y <Z, the neutral point can be maintained for any of the coils. Therefore, it is not necessary to prepare a plurality of types of connection mounting portions (or molds for forming the connection mounting portions) according to different coil diameters, and thus management in manufacturing is simplified, and thus the manufacturing cost of the motor is reduced. Can be reduced.
[0019]
In the present embodiment, each of the rotors having three teeth has been described. However, the present invention is not limited to this, and the present invention can be applied to a rotor having six or eight teeth, and the number of teeth is not particularly limited. Alternatively, two or three connection attachment portions may be formed on one tooth, and the width dimension of the gap between each connection attachment portion may be varied as described above.
[0020]
In short, in a Y-connected motor, in order to maintain a neutral point, it is sufficient that a plurality of connection mounting portions are formed on the rotor so as to correspond to at least two types of coils having different diameters. It is only necessary that the width dimensions of the gaps sandwiching the lead lines of the points are different from each other.
[0021]
As explained above, the rotor of the motor of the present invention has an excellent effect that the neutral point can be easily held in accordance with the change of the coil diameter in the rotor of the motor having the Y connection. .
[Brief description of the drawings]
FIG. 1 is a plan view seen from an axial direction of a rotor of a motor according to an embodiment of the present invention.
FIG. 2 is a P view of FIG. 1 showing a connection attaching portion according to the present embodiment.
FIG. 3 is a perspective view showing a rotor base in a rotor of a conventional motor.
FIG. 4 is a plan view showing a rotor of a conventional motor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Motor rotor, 14 ... Core iron core, 16 ... Coil, 22 ... Rotating shaft, 28 ... Iron core insulation part (insulation part), 28a ... Teeth, 32 ... Connection attachment part, 36 ... Neutral point, 36a ... Mouth Line, X, Y, Z ... Gap.

Claims (1)

A core iron core provided on the rotating shaft and formed with a plurality of teeth in the radial direction;
A coil wound around the core core by Y connection;
An insulating portion provided in the core iron core for insulating between the coil and the core iron core, and the insulating portion provided integrally with the insulating portion at positions corresponding to the teeth, and the coil by Y connection A motor rotor, comprising: a connection attachment portion having a gap for sandwiching a lead wire at a neutral point of the teeth and having a different width for each of the teeth.

Images