KR20000027452A - Rotor structure of variable speed motor - Google Patents

Abstract

PURPOSE: A rotor structure of a variable-speed electric motor is provided to decrease a bad percentage, caused by damage of a reflected plate when injecting the reflected plate, as assembling the reflected plate with a simple hand-operation, without another injecting equipment. CONSTITUTION: A rotor structure of a variable-speed electric motor comprises a rod-shaped body(54), a rotor axis(50), a ring-shaped body(66), projectors, first filling holes(62), a rotor core(60), an injection molder(70), and a reflected plate(40). The rotor axis is composed of a milling unit, milling-processed of an outer diameter of the body. The ring-shaped body has an inner diameter inserted in the milling unit of the rotor axis. The first filling holes are formed on the diameter inside. The projectors are projected/formed on the outer diameter of the body. The rotor core is formed with first filling holes formed on an inner diameter. The injection molder fills an injected material to the first and a second filling hole, and has protrusions for fixing on one side of the outer part. The reflected plate is composed of an assembling hole formed to be inserted corresponding to the protrusions, between the projectors.

Description

Rotor structure of variable speed motor

The present invention relates to a variable speed motor in which a reflector is used on a rotor for the purpose of detecting the position of the rotor, and in particular, it is possible to assemble the reflector by a simple manual operation without a separate press fitting facility, thereby reducing the defective rate due to the reflector breakage when the reflector is pressed. The rotor structure of a variable speed motor.

In general, the electric motor is to apply a driving force of another product by the power of the rotation of the rotor provided on the inner diameter surface of the stator to perform a desired operation, the rotor is composed of a rotor core and a rotating shaft.

Then, the rotor structure of the electric motor according to the prior art will be described with reference to the accompanying drawings.

1 is an exploded perspective view showing the assembly structure of the rotor 100 of the variable speed motor according to the prior art, wherein 10 is a rotor core, 20 is a reflector, 30 is a rotating shaft, 32 is a bushing.

The rotor core 10 has a ring shape having a predetermined inner diameter 12 formed therebetween so that the rotor core 30 can be inserted into the rotor shaft 30. Each is formed. The rotor core 10 having such a configuration is inserted into the rotary shaft 30 by gathering at least several sheets.

The reflector plate 20 is used to detect the position of the rotor 100, and is the same shape and size as the rotor core 10. The reflector plate 20 is inserted opposite to the rotor shaft 30 into which the rotor core 10 is inserted.

A bushing 32 is inserted between the rotor core 10 and the reflector plate 20 to maintain a certain distance. The bushing 32 is a separate bushing having an annular shape whose inner diameter is the same as or larger than the inner diameter of the rotor shaft 30 so as to be inserted and fixed to the rotor shaft 30, or integrated with the reflector plate 20. It is characterized in that the bushing formed into a structure.

Then, the rotor operation of the conventional variable speed motor by the above configuration will be described.

First, it is assumed that an armature coil (not shown) is wound around the rotor core 10, and when a current flows through the armature coil, a magnetic field proportional to the magnitude of the current is formed in the rotor core 10, thereby providing a constant rotational force. You get At this time, the rotor 100 rotated by the rotational force is rotated together with the rotating shaft 30 supported by the bearing to obtain a predetermined desired rotational force.

However, in the rotor structure of the conventional variable speed motor configured as described above, the rotor plate 30 is inserted into the rotor core 10 and then the reflector plate 20 used for position detection of the rotor 100. Is inserted into the rotor shaft (30) opposite the rotor core (10). In order to maintain a predetermined space between the rotor core 10 and the reflector 20, a separate bushing 32 is inserted or the shape of the reflector is press-fitted into a structure integrated with the bushing. At this time, the rotor structure of the conventional variable speed motor requires a separate tooth, a tool and a press fitting facility to press-fit the reflector plate 20 and the bushing 32, there was a problem that requires a lot of work. In addition, there is a problem in that the failure rate of the reflection plate is damaged if the wrong by using the teeth, tools and press fitting equipment during the indentation process.

Accordingly, the present invention was devised to solve the above problems, and an object of the present invention is to enable a reflector plate assembly by simple manual operation without a separate press fitting facility, thereby reducing the defective rate due to breakage of the reflector plate when the reflector plate is pressed. To provide structure.

1 is an exploded perspective view showing a rotor of a motor according to the prior art

Figure 2 is a plan view showing a reflector of the rotor according to the present invention

Figure 3 is a cross-sectional view showing the rotor shaft according to the present invention

Figure 4 is a plan view showing a rotor core according to the present invention

5 is a cross-sectional view showing an injection molded part of the rotor according to the present invention.

Figure 6 is an exploded perspective view showing a rotor according to the present invention

Explanation of symbols on the main parts of the drawings

10, 60: rotor core 12: inner diameter of the rotor core

14: protruding piece of the rotor core 20: reflecting plate

30: rotor shaft 32: bushing

40: reflecting plate 42: assembly hole of the reflecting plate

44: inner diameter of the reflecting plate 46: body portion of the reflecting plate

48: protrusion of reflector 50: rotor shaft

52: milling portion of the rotor shaft 54: the body portion of the rotor shaft

60: rotor core 62: first filling hole

64: inner diameter of the rotor core 64a: second filling hole

66: main body portion of the rotor core 68: protruding pieces of the rotor core

70: injection molding part 72: projection fixing projections

100: conventional rotor structure 200: rotor structure of the present invention

In the rotor structure of a variable speed motor according to the present invention for achieving the above object,

A rotor shaft comprising a main body portion having a round bar shape, and a milling portion milling the outer diameter of the main body portion to a predetermined length;

An annular body portion having a predetermined inner diameter inserted into the milling portion of the rotor shaft, a plurality of protrusions protruding from the outer diameter of the body portion, and a plurality of first filling holes formed between the protrusions and the inner diameter; A rotor core composed of a plurality of second filling holes formed in the inner diameter;

Injection molding means for filling an injection product into the first and second filling holes of the rotor core inserted into the milling part of the rotor shaft, and having a plurality of fixing protrusions formed on one side thereof;

Corresponding to the fixing projection of the injection molding means between the ring-shaped body portion having a predetermined size of the inner diameter inserted into the rotor shaft, a plurality of protrusions protruding from the outer diameter of the body portion, and between the protrusion and the inner diameter Characterized in that it comprises a reflecting plate consisting of an assembly hole formed to be inserted.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a plan view showing a reflector plate 40 of the rotor according to the present invention, Figure 3 is a sectional view showing a rotor shaft 50 according to the present invention, Figure 4 is a rotor core ( Fig. 60 is a plan view. 5 is a cross-sectional view showing the injection molding part 70 of the rotor according to the present invention, Figure 6 is an exploded perspective view showing the rotor according to the present invention.

First, the reflector plate 40 of the present invention shown in FIG. 2 includes an annular body portion 46 having an inner diameter 44 of a predetermined size for insertion into a rotor shaft, and top, bottom, left and right sides of the outer diameter of the body portion 46. It consists of a projection piece 48 protruding to a certain size in the direction, and an assembly hole 42 formed between the projection piece 48 and the inner diameter 44, respectively. On the other hand, the outer diameter of the protruding piece 48 is characterized in that it has the same radius of curvature as the outer diameter of the main body portion 46.

The rotor shaft 50 of this invention shown in FIG. 3 is comprised from the main-body part 54 which has a round bar shape, and the milling part 52 which milled by the predetermined length to the outer diameter of this main-body part 54. As shown in FIG. The milling part 52 is formed to prevent the rotor core (reference numeral 60 in FIGS. 4 and 5) and the rotation shaft 50 from moving during injection molding (reference numeral 72 in FIG. 5).

The rotor core 60 of the present invention illustrated in FIG. 4 includes an annular body portion 66 having an inner diameter 64 of a predetermined size for insertion into the rotor shaft 50, and the top, bottom, left and right sides of the inner diameter. A filling hole 64a formed in the upper portion, a protrusion piece 68 protruding to a predetermined size in the up, down, left and right directions of the outer diameter of the main body portion 66, and a filling hole formed between the protrusion piece 68 and the inner diameter 64, respectively. It consists of 62. The filling hole 64a is similar to the milling part 52 formed in the rotor shaft 50, and the rotor core (symbol 60 in FIGS. 4 and 5) and the rotor shaft when filling the injection molding (reference numeral 72 in FIG. 5). 50 is formed to prevent the movement. In addition, the protruding piece 68 is characterized in that the radius of curvature of the outer diameter is different from the radius of curvature of the outer diameter of the main body portion 66.

The injection molding part 70 of the rotor according to the present invention shown in FIG. 5 is injected into the filling hole 64a and the filling hole 62 of the rotor core 60 inserted into the rotor shaft 50. The rotor core 60 is fixed to the rotor shaft 50 by filling a gap, and a reflection plate fixing protrusion for inserting the assembly hole 42 formed in the reflection plate 40 is formed at the outside thereof. .

6 is an exploded perspective view of the rotor 200 according to the present invention, the rotor core 60 inserted into the rotor shaft 50 by the injection molding unit 70 and the injection molding unit 70. The reflection plate fixing projection 72 is formed of a reflection plate 40 which inserts and fixes the assembly hole 42 therein.

Then, the operation according to the rotor structure of the variable speed motor of the present invention will be briefly described.

When a current flows through an armature coil (not shown) wound around the rotor core 60, a magnetic field proportional to the magnitude of the current is formed in the rotor core 60 to apply a constant rotational force. At this time, the rotor 200 rotated by the rotational force is rotated together with the rotor shaft 50 supported by a bearing (not shown) to obtain a predetermined desired rotational force.

Here, the feature of the present invention by the above configuration is to make the injection molding operation by forming a milling unit 52 smaller the outer diameter of the rotor shaft 50 than the inner diameter of the rotor core (60). In addition, filling injection holes 64a and filling holes 62 are formed in the rotor core 12 to secure a torsional torque between the rotor core 60 and the rotor shaft 50 during injection molding. When the injection molding part 70 is filled, flow of the rotor core 60 and the rotor shaft 50 is suppressed.

In addition, the injection molding unit 70 obtains a strong fastening force by forming a fixing protrusion 72 for fixing the reflecting plate 40 at a position coupled with the reflecting plate 40, and the reflecting plate 40. Corresponds to the injection-molded fixing projection 72 to form as many assembling holes 40.

Therefore, according to the rotor structure of the variable speed motor of the present invention by the above configuration, when assembling the reflector plate 40, the reflector plate 40 can be assembled by a simple manual operation without additional teeth and tools, and the rotor core ( 60 is firmly coupled to the rotor shaft 50 by the injection molding unit 70 to prevent the flow of the rotor 200 is generated.

As described above, according to the rotor structure of the variable speed motor according to the present invention, the outer diameter of the rotor shaft is milled to a predetermined length smaller than the inner diameter of the rotor core inserted into the rotor shaft, and a large number of filling holes are provided in the rotor core. The dogs were formed and filled with injection moldings. In the injection molding, a plurality of fixing protrusions for fixing the reflecting plate were formed, and a plurality of assembly holes 40 were formed in the reflecting plate so as to correspond to the fixing protrusions. Therefore, when assembling the reflector plate, the reflector may be assembled by simple manual work without additional teeth and tools, and the rotor core is firmly coupled to the rotor shaft by the injection molding unit to prevent the rotor from generating flow when rotating. It has a very good effect.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, these modifications and changes should be seen as belonging to the following claims. something to do.

Claims (1)

In a variable speed motor, A rotor shaft 50 composed of a main body portion 54 having a round bar shape, a milling portion 52 milling the outer diameter of the main body portion 54 to a predetermined length, An annular body portion 66 having a predetermined inner diameter 64 inserted into the milling portion 52 of the rotor shaft 50, and a protruding piece 68 protruding from the outer portion of the body portion 66. ), A rotor core composed of a plurality of first filling holes 62 formed between the protruding pieces 68 and the inner diameter 64, and a plurality of first filling holes 64a formed in the inner diameter 64 ( 60), Filling the injection-molded product into the first and second filling holes 64a and 62 of the rotor core 60 inserted into the milling part 52 of the rotor shaft 50, and fixing a plurality of the outer surfaces of the rotor shaft 50 to one side thereof. Injection molding means 70 having a projection 72 formed therein; An annular body portion 46 having a predetermined inner diameter inserted into the rotor shaft 50, a protrusion piece 48 protruding a plurality of outer diameters of the body portion 46, and the protrusion piece 48. And a reflector plate 40 composed of assembly holes 42 formed so as to be inserted between the inner diameter 44 and the fixing projection 72 of the injection molding means 70. Electronic structure.