An injection molding stepping motor

Abstract

The present invention relates to an injection-molded stepper motor, comprising an injection-molded stator assembly and a rotor assembly. The injection-molded stator assembly comprises a stator core, a front frame, a rear frame, a stator winding, a front inner liner ring, a rear inner liner ring, and a mounting bracket. The stator winding is wound in slots in the stator core, into which the front and rear frames are inserted. The front inner liner ring and the rear inner liner ring are mounted on either side of the stator core, which is fixed to the mounting bracket. The front inner liner ring and the rear inner liner ring are both formed by punching and laminating thin plates of different inner diameters. Compared with the prior art, the present invention has the advantages of reducing axial magnetic flux leakage of the motor and increasing the torque of the motor.

Description

Technical Field

[0001] The present invention relates to a motor, in particular to an injection molding stepping motor. Background Art

[0002] The existing injection molding stepper motor includes an injection molding stator assembly 1, the structure of which is as follows: Figure 1 As shown, the injection molded stator assembly 1 includes a stator core 2, a front frame 3, a rear frame 4, a stator winding 5, a front liner ring 6, a rear liner ring 7 and a mounting bracket 8. Figure 2 As shown, the injection-molded stator component 1 is injection-molded through a mold.

[0003] The motor is assembled from a motor stator assembly and a rotor assembly. The injection molded stator assembly 1 requires grooves to be machined on the front and rear liner rings, and retaining rings are placed in the grooves to prevent the rotor from falling out of the motor due to the existence of axial force.

[0004] The processed stator assembly 10 is as follows Figure 3 As shown, the machined stator assembly 10 is provided with machined stator grooves 9 .

[0005] In the existing design scheme, the groove for placing the clamping ring is processed after injection molding, which causes processing difficulties and cumbersome procedures. At the same time, since the front and rear inner liner rings are in direct contact with the stator core during injection molding in the existing scheme, when the front and rear inner liner rings are made of magnetic conductive material, the motor will still have a notch connection, resulting in magnetic leakage and reduced motor torque. When the front and rear inner liner rings are made of non-magnetic conductive material, the cost of the inner liner rings will cause the cost of the motor to be too high. Summary of the Invention

[0006] The purpose of the present invention is to provide an injection molding stepping motor in order to overcome the defects of the above-mentioned prior art.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] An injection-molded stepper motor includes an injection-molded stator assembly and a rotor assembly. The injection-molded stator assembly includes a stator core, a front frame, a rear frame, a stator winding, a front inner liner ring, a rear inner liner ring, and a mounting bracket. The stator winding is wound in a slot of the stator core into which the front and rear frames are inserted. The front inner liner ring and the rear inner liner ring are mounted on both sides of the stator core. The stator core is fixed to the mounting bracket. The front inner liner ring and the rear inner liner ring are both structures formed by punching and laminating thin plates with different inner diameters.

[0009] Preferably, the thin plate includes a first thin plate and a second thin plate with different inner diameters, and the first thin plate and the second thin plate are laminated to form a retaining ring groove for accommodating the rotor to prevent it from falling out.

[0010] Preferably, the first thin plate and the second thin plate are thin plates made of stainless steel.

[0011] Preferably, the thin plate includes a third thin plate, a fourth thin plate and a fifth thin plate, wherein the inner diameters of the third thin plate and the fifth thin plate are the same, the inner diameter of the fourth thin plate is larger than that of the third thin plate, the fifth thin plate is arranged on the side closest to the stator core, the third thin plate is adjacent to the fifth thin plate and is connected, and the fourth thin plate is embedded in the third thin plate.

[0012] Preferably, the fifth thin plate is a thin plate made of non-magnetic material, and the third thin plate and the fourth thin plate are iron plates.

[0013] Preferably, the non-magnetic material is stainless steel.

[0014] Preferably, the thickness of the fifth laminated sheet is 1 to 2 mm.

[0015] Preferably, high temperature resistant plastic or insulating paper is added to one side of the stator core.

[0016] Preferably, the thickness of the plastic or insulating paper is 0.5-2 mm.

[0017] Preferably, the front frame or the rear frame adopts a new frame, and the new frame has an extension portion in the radial direction, and the extension portion is used to cover the teeth of the stator core.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1) By stacking thin plates with different inner diameters, groove processing after injection molding is avoided, thereby reducing the axial magnetic leakage of the motor and improving the torque of the motor;

[0020] 2) The use of non-magnetic conductive materials in the inner liner ring of the motor is reduced, thereby reducing the cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of an injection-molded stator assembly of an existing injection-molded stepping motor;

[0022] Figure 2 This is a schematic diagram of the exploded structure of the injection-molded stator assembly of an existing injection-molded stepper motor;

[0023] Figure 3 The figure is a schematic diagram of the structure of the injection-molded stator assembly after processing of an existing injection-molded stepping motor;

[0024] FIG4( a ) is a schematic diagram of the three-dimensional structure of the liner ring of Example 1;

[0025] FIG4( b ) is a schematic diagram of the main structure of the liner ring of Example 1;

[0026] FIG4( c ) is a schematic cross-sectional view taken along the line AA of FIG4( b );

[0027] Figure 5 It is a schematic diagram of the partially enlarged structure of Figure 4(c);

[0028] Figure 6 This is a schematic structural diagram of the injection-molded stator assembly after assembly in Example 1;

[0029] FIG7( a ) is a schematic diagram of the three-dimensional structure of the inner liner ring of Example 2;

[0030] FIG7( b ) is a schematic diagram of the main structure of the liner ring of Example 2;

[0031] FIG7( c ) is a schematic cross-sectional view taken along the line AA of FIG7( b );

[0032] Figure 8 It is a partial enlarged structural schematic diagram of Figure 7(c);

[0033] Figure 9 This is a schematic structural diagram of the injection-molded stator assembly after assembly in Example 2;

[0034] Figure 10 This is a schematic structural diagram of the injection-molded stator assembly of Example 3;

[0035] Figure 11 This is a schematic diagram of the new skeleton structure of Example 4;

[0036] FIG12( a ) is a schematic diagram of the front view structure of the new skeleton of Example 4;

[0037] Figure 12(b) is a schematic diagram of the three-dimensional structure of the new skeleton of Example 4;

[0038] Figure 13 This is a schematic diagram of the assembly of the stator core, frame and steel sleeve of Example 4;

[0039] Figure 14 This is a schematic diagram of the assembled structure of Example 4.

[0040] Among them, 1 is the injection molded stator assembly, 2 is the stator core, 3 is the front frame, 4 is the rear frame, 5 is the stator winding, 6 is the front inner liner ring, 7 is the rear inner liner ring, 8 is the mounting bracket, 9 is the processed stator groove, 10 is the processed stator assembly, 11 is the first steel sleeve, 12 is the first thin plate, 13 is the second thin plate, 14 is the clamping ring groove, 15 is the second steel sleeve, 16 is the third thin plate, 17 is the fourth thin plate, 18 is the fifth thin plate, 19 is plastic or insulating paper, 20 is the new frame, 21 is the extension part, 22 is the tooth part of the stator core, 23 is the internal groove, 24 is the inner liner ring of Example 4, and 25 is the injection molded stator assembly of Example 4. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0042] Example 1

[0043] The present invention provides an injection-molded stepper motor, comprising an injection-molded stator assembly 1 and a rotor assembly. The injection-molded stator assembly 1 comprises a stator core 2, a front frame 3, a rear frame 4, a stator winding 5, a front inner liner ring 6, a rear inner liner ring 7 and a mounting bracket 8. The stator winding 5 is wound in a slot of the stator core into which the front and rear frames are inserted. The front inner liner ring 6 and the rear inner liner ring 7 are mounted on both sides of the stator core 2. The stator core 2 is fixed on the mounting bracket 8. The front inner liner ring 6 and the rear inner liner ring 7 are both structures formed by punching and laminating thin plates with different inner diameters, as shown in Figures 4-6.

[0044] The thin plates include a first thin plate 12 and a second thin plate 13 of different inner diameters. The first and second thin plates 12, 13 are laminated to form a retaining ring groove 14 for accommodating a rotor to prevent escape. To prevent magnetic flux leakage and increase motor strength, the thin plates used to stamp the front and rear inner liner rings are made of stainless steel.

[0045] Example 2

[0046] As shown in Figures 7-8, the designed front and rear inner liner rings are also made of thin plates punched and then stacked, where the thin plates include a third thin plate 16, a fourth thin plate 17 and a fifth thin plate 18, where the inner diameters of the third thin plate 16 and the fifth thin plate 18 are the same, the inner diameter of the fourth thin plate 17 is larger than that of the third thin plate 16, the fifth thin plate 18 is arranged on the side closest to the stator core 2, the third thin plate 16 and the fifth thin plate 18 are adjacently connected, and the fourth thin plate 17 is embedded in the third thin plate 16.

[0047] Preferably, the fifth thin plate 18 is made of a non-magnetic material, and the third thin plate 16 and fourth thin plate 17 are iron plates. The laminated thickness of the fifth thin plate 18 is 1-2 mm. When the second steel sleeve 15 is installed, the end of the non-magnetic material 18 is installed on the inner side of the stator, contacting the stator core of the motor.

[0048] The installation position of the liner ring is shown in Figure 9 .

[0049] Example 3

[0050] The front and rear liner rings adopt the liner rings in Example 1 or Example 2, but high temperature resistant plastic or insulating paper 19 is added to the side of the injection molded stator assembly close to the stator core, such as Figure 10 As shown, the thickness is 0.5 to 2 mm.

[0051] Implementation 4

[0052] Figure 11 A new skeleton 20 is designed, which has an extension portion 21 in the radial direction. The extension portion 21 covers the teeth of the stator.

[0053] The assembly diagram of the stator core (windings are not shown) and the frame is shown in FIG12 , where the radially extending portion of the frame covers the teeth 22 of the motor stator core.

[0054] The assembly diagram of the stator core (winding not shown), frame and steel sleeve is as follows: Figure 13 As shown, the inner liner ring 24 in embodiment 1 or embodiment 2 is used, as shown in FIG. Figure 13 As shown, there are grooves 23, and the injection molded stator component 25 is as shown. Figure 14 shown.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An injection molded stepper motor, comprising an injection molded stator assembly (1) and a rotor assembly, wherein the injection molded stator assembly (1) comprises a stator core (2), a front frame (3), a rear frame (4), a stator winding (5), a front inner liner ring (6), a rear inner liner ring (7) and a mounting bracket (8), wherein the stator winding (5) is wound in a slot of the stator core into which the front and rear frames are inserted, the front inner liner ring (6) and the rear inner liner ring (7) are mounted on both sides of the stator core (2), and the stator core (2) is fixed on the mounting bracket (8), characterized in that: The front inner lining ring (6) and the rear inner lining ring (7) are both formed by punching thin plates with different inner diameters and then laminating them; The thin plates include a third thin plate (16), a fourth thin plate (17) and a fifth thin plate (18), wherein the inner diameters of the third thin plate (16) and the fifth thin plate (18) are the same, the inner diameter of the fourth thin plate (17) is larger than that of the third thin plate (16), the fifth thin plate (18) is arranged on the side closest to the stator core (2), the third thin plate (16) and the fifth thin plate (18) are adjacently connected, and the fourth thin plate (17) is embedded in the third thin plate (16); the fifth thin plate (18) is a thin plate made of non-magnetic material, the third thin plate (16) and the fourth thin plate (17) are iron plates; the non-magnetic material is stainless steel; The thin plate comprises a first thin plate (12) and a second thin plate (13) having different inner diameters. The first thin plate (12) and the second thin plate (13) are laminated to form a retaining ring groove (14) for accommodating a rotor to prevent the rotor from falling out.

2. The injection molded stepper motor according to claim 1, characterized in that: The first thin plate (12) and the second thin plate (13) are thin plates made of stainless steel.

3. The injection molded stepper motor according to claim 1, characterized in that: The laminated thickness of the fifth thin plate (18) is 1-2 mm.

4. The injection molded stepper motor according to claim 1, characterized in that: High-temperature resistant plastic or insulating paper (19) is added to one side of the stator core (2).

5. The injection molding stepping motor according to claim 4, characterized in that: The thickness of the plastic or insulating paper (19) is 0.5-2 mm.

6. The injection molded stepper motor according to claim 1, characterized in that: The front frame (3) or the rear frame (4) adopts a new frame (20), and the new frame (20) has an extension portion (21) in the radial direction, and the extension portion (21) is used to cover the teeth of the stator core (2).

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