Plastic package motor

Abstract

A plastic package stator and an end cover are respectively provided with a bearing seat, each bearing seat comprises an end plate and an annular sleeve extending from the edge of the end plate, a bearing chamber is formed between the end plate and the annular sleeve, and the middle of the end plate is provided with a shaft hole through which a rotating shaft penetrates. A plurality of bosses distributed at intervals in the circumferential direction are arranged on the surface, close to the top face, of the annular sleeve, a connecting part extends out of the surface of the annular sleeve, a cylindrical boss is arranged at the end of the connecting part, and a screw hole is formed in the middle of the cylindrical boss; the end cover is an injection molding end cover, the stator iron core, the bearing seat, the coil winding and the end part insulator are injection-molded into a whole through a plastic package body, and the end face of a cylindrical boss of the bearing seat is exposed on the surface of the plastic package body; when the injection molding end cover is subjected to injection molding, the bearing seat is subjected to injection molding integrally, and the end face of the cylindrical boss of the bearing seat is exposed on the surface of the injection molding end cover, so that the size accuracy of the end cover is improved, the design requirement can be better met, and the noise, vibration, service life and the like of the motor are guaranteed.

Description

Technical Field

[0001] The utility model relates to a plastic-sealed motor. Background Art

[0002] The existing plastic-encapsulated motor mainly consists of a plastic-encapsulated stator, an end cover, and a rotor assembly. The plastic-encapsulated stator is provided with a BB cover, which forms a bearing chamber, and the end cover is provided with a bearing chamber. The BB cover and the end cover are stamped from galvanized sheet material.

[0003] Existing problems: Various forming defects often occur in the actual stamping production process of BB covers and end covers made of galvanized sheets, which seriously affect the geometric accuracy, mechanical properties and surface quality of the stamped parts. The main geometric dimensions and form and position tolerances of these components have a significant impact on the motor noise, vibration and service life.

[0004] Furthermore, in existing plastic-encapsulated motor structures, the backing cover and end caps in the injection-molded stator are both manufactured using metal stamping dies. To prevent electrical corrosion of the bearings, the front and rear end caps are bonded together with conductive tape. However, due to the high on-resistance of the conductive tape, the connection is not ideal. The optimal method is to connect the front and rear end caps via lead wires. However, existing plastic-encapsulated motors often use thin galvanized sheet metal for the backing cover. This results in self-tapping screws locking the stator with most of the screw length penetrating into the BMC injection molding compound. This easily turns into powder as the threads rotate, leading to thread slippage and failure. Summary of the Invention

[0005] The purpose of the utility model is to provide a plastic-encapsulated motor to solve the various forming defects that often occur in the actual stamping production process of BB covers and end covers made of galvanized sheet materials in the prior art, which seriously affect the geometric accuracy, mechanical properties and surface quality of the stamped parts, and the main geometric dimensions and form and position tolerances of these parts have a significant impact on the motor noise, vibration and service life. Technical problems.

[0006] The technical solution of the present utility model is achieved as follows:

[0007] The utility model provides a plastic-encapsulated motor, comprising a rotor, a plastic-encapsulated stator, an end cover and two bearing seats. The rotor is embedded in the plastic-encapsulated stator, the end cover is mounted on the top of the plastic-encapsulated stator, and the two bearing seats are respectively mounted on the bottom and end cover of the plastic-encapsulated stator. The plastic-encapsulated stator comprises a stator core, a coil winding, end insulation and a plastic-encapsulated body. The coil winding is wound after the stator core is mounted on the end insulation. One of the bearing seats is located in the middle of the bottom of the plastic-encapsulated body. The stator core, the bearing seat, the coil winding and the end insulation are injection-molded into a whole by the plastic-encapsulated body. The end cover is a plastic-encapsulated end cover containing another bearing seat, and the end cover is mounted on the top of the plastic-encapsulated body. The utility model is characterized in that:

[0008] The bearing seat includes an end plate and an annular sleeve extending from the edge of the end plate. A bearing chamber is formed between the end plate and the annular sleeve. An axial hole through which the rotating shaft passes is provided in the middle of the end plate. A plurality of circumferentially spaced bosses are provided on the surface of the annular sleeve near the top surface. A connecting portion extends from the surface of the annular sleeve. A cylindrical boss is provided at the end of the connecting portion. A screw hole is provided in the middle of the cylindrical boss. The end cap is an injection-molded end cap.

[0009] After injection molding, the end face of the cylindrical boss of the bearing seat is exposed on the surface of the plastic package body; when the injection molding end cover is injected, the bearing seat is injection molded into one piece, and the end face of the cylindrical boss of the bearing seat is exposed on the surface of the injection molding end cover.

[0010] The screw holes located in the cylindrical bosses are blind holes.

[0011] The other end surface of the cylindrical boss and the top surface of the annular sleeve of the bearing seat are in the same horizontal plane.

[0012] The top surface of the annular sleeve of the bearing seat and the end surface of the end cover are in the same horizontal plane; the inner surface of the plastic package body and the top surface of the annular sleeve of the bearing seat are in the same horizontal plane.

[0013] There is a certain distance H between the top surface of the aforementioned boss and the top surface of the annular sleeve.

[0014] The above-mentioned H>1mm.

[0015] The bearing seat described above is a cast aluminum bearing seat.

[0016] The outer surface of the plastic package body is provided with a connected lead groove, the two ends of the lead groove are respectively close to the cylindrical bosses on the bearing seats at both ends, the wire is located in the lead groove, and the two ends of the wire are respectively electrically connected to the two bearing seats.

[0017] The above also includes a rotating shaft and bearings. The bearings are installed in the bearing chambers of the bearing seats at both ends. The rotating shaft is supported between the bearings at both ends. The two ends of the rotating shaft extend out of the plastic-sealed stator and end cover respectively, and the rotor is sleeved outside the rotating shaft.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1. The utility model provides a plastic-sealed stator and an end cover respectively provided with the same bearing seat, the bearing seat comprising an end plate and an annular sleeve extending from the edge of the end plate, a bearing chamber is formed between the end plate and the annular sleeve, an axial hole through which the rotating shaft passes is provided in the middle of the end plate, a plurality of bosses distributed at circumferential intervals are provided on the surface of the annular sleeve close to the top surface, a connecting portion is extended from the surface of the annular sleeve, a cylindrical boss is provided at the end of the connecting portion, a screw hole is provided in the middle of the cylindrical boss; the end cover is an injection-molded end cover, the stator core, the bearing seat, the coil winding and the end insulation are injection-molded into a whole through the plastic-sealed body, and the end face of the cylindrical boss of the bearing seat is exposed on the surface of the plastic-sealed body; the injection-molded end cover is injection-molded into one piece with the bearing seat during injection molding, and the end face of the cylindrical boss of the bearing seat is exposed on the surface of the injection-molded end cover, which improves the dimensional accuracy of the end cover and can better meet the design requirements, thereby ensuring the noise, vibration and service life of the motor.

[0020] 2. Other advantages of the present invention are described in detail in the embodiment section of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram provided for the present utility model;

[0022] Figure 2 A three-dimensional diagram from another angle provided by the utility model;

[0023] Figure 3 A partial exploded view provided for the present utility model;

[0024] Figure 4 Another partial exploded view provided by the utility model;

[0025] Figure 5 A front view provided for the utility model;

[0026] Figure 6 for Figure 5 Cross-sectional view of the middle BB;

[0027] Figure 7 A three-dimensional diagram of the bearing seat structure provided by the utility model;

[0028] Figure 8 A three-dimensional view of the bearing seat structure provided by the present invention from another angle;

[0029] Figure 9 A front view of the bearing seat structure provided by the utility model;

[0030] Figure 10 for Figure 9 Cross-sectional view of AA in the figure. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1:

[0033] like Figures 1 to 10 As shown, this embodiment provides a plastic-encapsulated motor, including a rotor 1, a plastic-encapsulated stator 2, an end cover 3 and two bearing seats 4. The rotor 1 is embedded in the plastic-encapsulated stator 2, the end cover 3 is installed on the top of the plastic-encapsulated stator 2, and the two bearing seats 4 are respectively installed on the bottom of the plastic-encapsulated stator 2 and the end cover 3. The plastic-encapsulated stator 2 includes a stator core 21, a coil winding, an end insulation 23 and a plastic-encapsulated body 24. The stator core 21 is installed with the end insulation 23 and then the coil winding is wound. One of the bearing seats 4 is located in the middle of the bottom of the plastic-encapsulated body 24. The stator core 21, the bearing seat 4, the coil winding and the end insulation 23 are injection-molded into a whole by the plastic-encapsulated body 24. The end cover 3 is a plastic-encapsulated end cover containing another bearing seat 4. The end cover 3 is installed on the top of the plastic-encapsulated body 24, and is characterized in that:

[0034] The bearing seat 4 includes an end plate 41 and an annular sleeve 42 extending from the edge of the end plate 41. A bearing chamber 40 is formed between the end plate 41 and the annular sleeve 42. An axial hole 411 through which the rotating shaft 7 passes is provided in the middle of the end plate 41. A plurality of circumferentially spaced bosses 43 are provided on the surface of the annular sleeve 42 near the top surface. The arrangement of the plurality of spaced bosses 43 improves the contact with the plastic-encapsulated stator and the end cover during the injection molding process and better fixes them. A connecting portion 44 extends from the surface of the annular sleeve 42. A cylindrical boss 45 is provided at the end of the connecting portion 44. A screw hole 451 is provided in the middle of the cylindrical boss 45. The end cover 3 is an injection-molded end cover 3.

[0035] After injection molding, the end face of the cylindrical boss 45 of the bearing seat 4 is exposed on the surface of the plastic package 24; when the injection-molded end cover 3 is injected, the bearing seat 4 is injection-molded into one piece, and the end face of the cylindrical boss 45 of the bearing seat 4 is exposed on the surface of the injection-molded end cover 3, which improves the dimensional accuracy of the end cover and can better meet the design requirements, thereby ensuring the noise, vibration and service life of the motor.

[0036] The screw hole 451 in the cylindrical boss 45 is a blind hole, which is subsequently used to screw in the lead-out wire lugs and connect the lead-out wires. The blind hole prevents the self-tapping screw from penetrating into the BMC injection molding compound during tightening, which could cause powder to form as the thread rotates and cause the thread to slip.

[0037] The other end surface of the cylindrical boss 45 and the top surface of the annular sleeve 42 of the bearing seat 4 are in the same horizontal plane, and the structural arrangement is reasonable.

[0038] The top surface of the annular sleeve 42 of the above-mentioned bearing seat 4 is in the same horizontal plane as the end surface of the end cover 3; the inner surface of the plastic sealing body 24 is in the same horizontal plane as the top surface of the annular sleeve 42 of the bearing seat 4, so that the bearing seat contacts the end surface of the mold core during the injection molding of the parts, and will not be deformed due to the force after being suspended.

[0039] A certain distance H (H>1mm) exists between the top surface of the boss 43 and the top surface of the annular sleeve 42. This allows the bottom surface of the end cap to be flush with the injection-molded stator and the plastic-encapsulated end cap, shortening the axial dimensions of the entire machine, compressing the overall space, saving BMC injection molding material, and ensuring that the bearing seat is axially constrained and does not deviate.

[0040] The bearing seat 4 is a cast aluminum bearing seat.

[0041] A connected lead groove 241 is provided on the outer surface of the above-mentioned plastic package body 24. The two ends of the lead groove 241 are respectively close to the cylindrical bosses 45 on the bearing seats 4 at both ends. The wire is located inside the lead groove 241, and the two ends of the wire are electrically connected to the two bearing seats 4 respectively.

[0042] The above also includes a rotating shaft 7 and bearings 6. The bearings 6 are installed in the bearing chambers 40 of the bearing seats 4 at both ends. The rotating shaft 7 is supported between the bearings 6 at both ends. The two ends of the rotating shaft 7 extend out of the plastic-sealed stator 2 and the end cover 3 respectively, and the rotor 1 is sleeved on the outside of the rotating shaft 7.

[0043] The above embodiments are preferred implementation methods of the present invention, but the implementation methods of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention are equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A plastic-encapsulated motor, comprising a rotor (1), a plastic-encapsulated stator (2), an end cover (3) and two bearing seats (4), wherein the rotor (1) is embedded in the interior of the plastic-encapsulated stator (2), the end cover (3) is installed on the top of the plastic-encapsulated stator (2), and the two bearing seats (4) are respectively installed on the bottom of the plastic-encapsulated stator (2) and the end cover (3), the plastic-encapsulated stator (2) comprises a stator core (21), a coil winding, an end insulation (23) and a plastic-encapsulated body (24), the stator core (21) is installed with the end insulation (23) and then the coil winding is wound, one of the bearing seats (4) is located in the middle position of the bottom of the plastic-encapsulated body (24), the stator core (21), the bearing seat (4), the coil winding and the end insulation (23) are injection-molded into a whole by the plastic-encapsulated body (24), the end cover (3) is a plastic-encapsulated end cover containing another bearing seat (4), and the end cover (3) is installed on the top of the plastic-encapsulated body (24), characterized in that: The bearing seat (4) includes an end plate (41) and an annular sleeve (42) extending from the edge of the end plate (41). A bearing chamber (40) is formed between the end plate (41) and the annular sleeve (42). An axial hole (411) through which the rotating shaft (7) passes is provided in the middle of the end plate (41). A plurality of bosses (43) are provided at intervals in the circumferential direction on the surface of the annular sleeve (42) near the top surface. A connecting portion (44) extends from the surface of the annular sleeve (42). A cylindrical boss (45) is provided at the end of the connecting portion (44). A screw hole (451) is provided in the middle of the cylindrical boss (45). After injection molding, the end surface of the cylindrical boss (45) of the bearing seat (4) is exposed on the surface of the plastic package (24); when the injection molding end cover (3) is injection molded, the bearing seat (4) is injection molded into one piece, and the end surface of the cylindrical boss (45) of the bearing seat (4) is exposed on the surface of the injection molding end cover (3).

2. The plastic-encapsulated motor according to claim 1, characterized in that: The screw hole (451) located in the cylindrical boss (45) is a blind hole.

3. The plastic-encapsulated motor according to claim 2, characterized in that: The other end surface of the cylindrical boss (45) and the top surface of the annular sleeve (42) of the bearing seat (4) are in the same horizontal plane.

4. The plastic-encapsulated motor according to claim 3, characterized in that: The top surface of the annular sleeve (42) of the bearing seat (4) and the end surface of the end cover (3) are in the same horizontal plane; the inner surface of the plastic sealing body (24) and the top surface of the annular sleeve (42) of the bearing seat (4) are in the same horizontal plane.

5. A plastic-encapsulated motor according to claim 1, 2 or 3, characterized in that: There is a certain distance H between the top surface of the boss (43) and the top surface of the annular sleeve (42).

6. The plastic-encapsulated motor according to claim 4, characterized in that: H>1mm.

7. The plastic-encapsulated motor according to claim 4, characterized in that: The bearing seat (4) is a cast aluminum bearing seat.

8. The plastic-encapsulated motor according to claim 4, characterized in that: A connected lead groove (241) is provided on the outer surface of the plastic package body (24) and the end cover (3), and two ends of the lead groove (241) are respectively close to the cylindrical bosses (45) on the bearing seats (4) at the two ends. The wire is located in the lead groove (241), and the two ends of the wire are respectively electrically connected to the two bearing seats (4).

9. The plastic-encapsulated motor according to claim 4, characterized in that: The invention also includes a rotating shaft (7) and bearings (6). The bearings (6) are installed in the bearing chambers (40) of the bearing seats (4) at both ends. The rotating shaft (7) is supported between the bearings (6) at both ends. The two ends of the rotating shaft (7) extend out of the plastic-sealed stator (2) and the end cover (3) respectively. The rotor (1) is sleeved outside the rotating shaft (7).

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