JPH069352U - Core cover for motor rotor - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the quality of the rotor by increasing the number of turns of the coil of the rotor of the motor. [Structure] Core 21 and coil 23 of rotor 20 of motor
The core cover 26 interposed between and is formed to a thin thickness of 0.15 mm or less.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a core cover for a rotor of a motor, and more particularly to a core cover for a rotor of a motor that improves the performance of the rotor.

[0002]

[Prior art]

 A conventional rotor of this type of motor will be described with reference to FIGS. FIG. 10 shows a cross section of a rotor 1 of a motor, and a coil 3 is wound around a core 2 of the rotor 1. Further, a core cover 4 is interposed between the core 2 and the coil 3 to prevent a short circuit between the core 2 and the coil 3.

FIG. 11 shows a die for forming the core cover 4, and a first die 5 and a second die 6 are pressed against each other. The mold 7 of the core cover 4 is engraved on the second mold. Then, an injection material 9 such as a melted resin is injected from the sprue 8 of the first mold 5 to perform injection molding. As shown in FIG. 12, since the injection gate 10 for the injection material 9 is provided above the vertical portion 7a of the mold 7, during the injection, the injection material 9 is injected into the mold 7 as shown in FIG. After flowing down the vertical portion 7a while drawing an arc, the horizontal portion 7b of the mold 7 is filled with the injection material 9.

After the injection material 9 is hardened, the first mold 5 and the second mold 6 are separated from each other and the molded core cover 4 is fixed by an ejector pin (not shown). Take it out.

[0005]

[Problems to be solved by the device]

 In order to improve the coil characteristics by increasing the number of windings of the coil 3, the conventional core cover 4 described above is particularly required to form the vertical portion 4a interposed between the coil 3 and the core 2 as thin as possible. Is desired. However, when the mold 7a of the vertical portion of the second mold 6 is thinly engraved, it is difficult to fill the injection material 8 due to problems such as the curing time of the injection material 8. Therefore, the core cover cannot be reduced to 0.2 mm or less, so that the coil characteristics are not improved and the performance of the rotor is supported.

Therefore, there arises a technical problem to be solved in order to improve the performance of the rotor by forming the core cover interposed between the rotor core and the core as thin as possible. The present invention aims to solve the problems.

[0007]

[Means for Solving the Problems]

 This invention has been proposed to achieve the above object, and in a rotor of a motor in which a coil is wound around the core of the rotor, the thickness of the core gover between the core and the coil is 0.15 mm or less. It is intended to provide a core cover for a rotor of a motor, which is characterized in that it is thinly formed.

[0008]

[Action]

 In this invention, since the core cover interposed between the rotor core and the coil is formed to have a thin wall thickness of 0.15 mm or less, the number of windings of the coil wound around the core is increased to improve the rotor performance. You can

[0009]

【Example】

 An embodiment of the present invention will be described below in detail with reference to FIGS. In the figure, reference numeral 20 denotes a motor rotor, and as shown in FIGS. 1 and 2, a coil 23 is wound around an accommodating portion 22 of the core 21. Incidentally, 24 is a shaft of the rotor 20, and 25 is a commutator. A core cover 26 is interposed between the core 21 and the coil 23 to prevent a short circuit between the core 21 and the coil 23.

As shown in FIGS. 3 and 4, the core cover 26 has a horizontal portion 27 and a vertical portion 28 integrally formed. The horizontal portion 27 contacts the front surface of the core 21 shown in FIGS. 1 and 2, and the vertical portion 28 contacts the inner surface of the housing portion 22 of the core 21. On the other hand, the core cover 26 is formed by mixing glass fiber with resin. Further, a rib 29 is provided at the center of the inner surface of the horizontal portion 27 of the core cover 26.

FIG. 5 shows a mold 30 of the core cover 26 shown in FIG. 4, which is composed of a fixed mold 31 and a movable mold 32. The fixed mold 31 is provided with a sprue 33, a runner 34, and a sub-runner 35. On the other hand, the movable mold 32 is composed of a first movable mold 36 and a second movable mold 37. As shown in FIGS. 5 and 6, the first movable mold 36 is engraved with the horizontal mold 38 of the horizontal portion 27 of the core cover 26 shown in FIG. 4, and further, the vertical mold shown in FIG. A through hole 39 having the same shape as the outer periphery of the portion 28 is opened.

A core pin 40 is fixedly mounted on a second movable mold 37 provided below the first movable mold 36, and the core pin 40 penetrates the first movable mold 36. It is constructed so that it can be fitted into the hole 39. The through-hole 39 and the core pin 40 form a vertical mold 41 for the vertical portion 28 of the core cover 26 shown in FIG. On the other hand, the sub-runner 35 is provided with six injection gates 42 and 43. The injection gate 42 is evenly provided at the central portion of the horizontal die 38, and the injection gate 43 is equally provided at the outer peripheral portion of the horizontal die 38 at three locations. The inner injection gate 42 is arranged at a different vertical position from the vertical mold 41. Further, a gap is provided between the core pin 40 and the movable die 32, and an air vent 44 is extended from the entire lower end of the vertical die 41 to the lower surface of the movable die 32.

When the casting material 45 shown in FIG. 8 is poured into the sprue 33, the casting material 45 is filled into the mold 46 through the runner 34 and the sub-runner 35. The injection material 45 is formed by mixing glass fiber with resin. At this time, since the injection gate 42 and the ejection gate 43 are provided above the horizontal mold 38, as shown in FIGS. 5 and 7, the injection material 45 flows in the horizontal direction (X direction in the drawings). After that, it flows in the vertical direction (Y direction in the figure).

That is, the injection material 45 is filled in the horizontal die 38 of the die 46 and then in the vertical die 41. Therefore, the flow length of the injection material 45 is shortened by the fact that the injection gates 42 and 43 are provided at six places and the flow path of the injection material 45 is not deviated. Further, since an air vent 44 is provided below the vertical mold 41 over the entire circumference to form a gap Δ between the movable mold 32 and the core pin 40, as shown in FIG. Air and gas are discharged to the outside, so that the injection material 45 can be surely filled in the mold 46.

On the other hand, when taking out the core cover 26 formed by hardening the injection material 45, first, the movable mold 32 is separated from the fixed mold 31, as shown in FIG. At this time, the hardened injection material 45 is cut from the core cover 26 at the lower end portion of the sub-runner 35. Then, the second movable mold 37 is separated from the first movable mold 36 to separate the core pin 40 from the core cover 26, and the core cover 26 is moved to the first movable mold 36 using an eject pin. More demolding.

At this time, as described above, since the core pin 40 is separated from the core cover 26, the contact area of the core cover 26 with the movable mold 32 becomes small, and the core at the time of the mold release is removed. The deformation of the cover 26 can be prevented. Further, the fixed mold 31 is provided with a recess 47, and the sub runner 35 is disposed on the upper surface of the recess 47. Further, the movable mold 32 is provided with a protrusion 48 that fits into the recess 47, and the mold 46 of the core cover 26 is engraved on the protrusion 48 portion. Therefore, the positioning and attachment / detachment of the fixed mold 31 and the movable mold 32 are facilitated. Further, as shown in FIG. 5, since the length H of the sub-runner 35 is shortened and the flow length of the injection material 45 is further reduced, the yield and quality of the core cover 26 can be improved.

The present invention can be variously modified without departing from the spirit of the invention, and it goes without saying that the invention extends to the modified version.

[0018]

[Effect of device]

 In this invention, as described in detail in the above-mentioned one embodiment, since the thickness of the core cover interposed between the rotor core and the coil is made thin to 0.15 mm or less, the number of windings of the coil wound around the core Can be increased. Therefore, the characteristics of the coil can be amplified and the quality of the rotor can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a rotor.

FIG. 2 is a cross-sectional view of a rotor.

FIG. 3 is a plan view of the core cover.

FIG. 4 is a perspective view of a core cover.

FIG. 5 is a vertical cross-sectional view of a mold.

FIG. 6 is a plan view of a movable mold.

FIG. 7 is an explanatory diagram showing a flow path of an injection material.

FIG. 8 is a vertical cross-sectional view of a mold showing a state where an injection material is injected.

FIG. 9 is a vertical cross-sectional view showing a state in which the mold is developed.

FIG. 10 is a cross-sectional view of a conventional rotor.

FIG. 11 is a vertical cross-sectional view of a conventional mold.

FIG. 12 is a plan view of a conventional movable mold.

FIG. 13 is an explanatory diagram showing a flow path of an injection material in a conventional mold.

[Explanation of symbols]

 20 rotor 21 core 23 coil 26 core cover

Claims (1)

[Scope of utility model registration request] 1. A rotor for a motor, in which a coil is wound around a core of the rotor, wherein a thickness of a core cover provided between the core and the coil is thinned to 0.15 mm or less. Core cover in.