Three-lobe coil motor for electric screwdriver industry

Abstract

The utility model discloses a kind of three-petal coil motor for electric screwdriver industry, including shell Shell is equipped with rotor assembly and stator assembly, stator assembly includes stator core and the cylindrical stator coil formed by three-petal coil, stator coil is arranged in stator core, and is closely attached with the inside wall of stator core, rotor assembly is arranged in stator coil, three-petal coil is respectively first coil, second coil and third coil, one end of first coil is laminated in the inside surface of second coil, the other end is laminated in the outside surface of third coil, the other end of second coil is laminated in the inside surface of one end of third coil.The utility model uses the design of three-petal coil mutual stacking to help improve the efficiency of motor.By increasing the number and distribution of coil, the use of magnetic field can be optimized, energy loss is reduced, so that the motor operates more efficiently.

Description

Technical Field

[0001] This utility model relates to the electric screwdriver industry, and in particular to a three-lobed coil motor for use in the electric screwdriver industry. Background Technology

[0002] Coreless brushless motors are DC, permanent magnet, servo micro motors. While inheriting the main design of traditional motors, they employ a cogging-free structure, which reduces eddy current losses in the iron core and significantly lowers the motor's weight and moment of inertia, thereby reducing mechanical losses. With the increasingly widespread application of coreless motors in industrial fields, the requirements for motor efficiency are also increasing. Not only must the motor meet the requirements of high-efficiency operation, but it must also meet requirements such as smooth operation and low noise. Existing coreless brushless motors generally use a single coil as the winding coil. A single coil has low magnetic field utilization, relatively large energy loss, and it is difficult to achieve electromagnetic force balance, resulting in significant vibration and noise from the motor rotor during rotation. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a three-lobed coil motor for the electric screwdriver industry.

[0004] The objective of this utility model is achieved through the following technical solution: a three-lobed coil motor for the electric screwdriver industry, comprising a housing, a front cover, and a rear cover. The housing contains a rotor assembly and a stator assembly. The rotor assembly is mounted within the housing via the front cover and the rear cover. The stator assembly includes a stator core and a cylindrical stator coil formed by three lobed coils. The stator coil passes through the stator core and is tightly attached to the inner wall of the stator core. The rotor assembly passes through the stator coil. The three lobed coils are a first coil, a second coil, and a third coil. One end of the first coil is stacked on the inner side of the second coil, and the other end is stacked on the outer side of the third coil. The other end of the second coil is stacked on the inner side of one end of the third coil.

[0005] As an improvement of the present invention for a three-lobed coil motor used in the electric screwdriver industry, the first coil, the second coil, and the third coil are all independent coils. The first coil, the second coil, and the third coil are all made of enameled wire wound from the inside out. The first coil, the second coil, and the third coil are all bent into an arc shape. The middle part of the first coil, the second coil, and the third coil all have a diamond-shaped through hole.

[0006] As an improvement of this utility model for a three-lobed coil motor in the electric screwdriver industry, the inner side wall of one end of the housing connected to the rear cover is provided with a bracket mounting step, a bracket is provided on the bracket mounting step, and a PCB board is mounted on the bracket. The outer side of the rear cover is provided with a rear cover annular step, which is embedded in the housing. The inner middle of the rear cover is provided with a rear bearing mounting groove, and a rear bearing is provided in the rear bearing mounting groove. The side wall of the rear bearing mounting groove is provided with a rear sealing ring mounting groove, and a rear sealing ring is provided in the rear sealing ring mounting groove. The rear sealing ring contacts the rear bearing.

[0007] The rear cover has a rear cover limiting protrusion on the side wall of the annular step, and the inner side wall of the end of the housing connected to the rear cover also has a rear cover limiting groove. When the rear cover is placed inside the housing, the rear cover limiting protrusion and the rear cover limiting groove cooperate with each other.

[0008] As an improvement of this utility model for a three-lobed coil motor used in the electric screwdriver industry, the outer side of the rear cover is provided with a lead wire outlet hole, through which the leads of the PCB board pass. The connecting wires of the first coil, the second coil, and the third coil are all electrically connected to the PCB board.

[0009] As an improvement of this utility model for a three-lobed coil motor in the electric screwdriver industry, the outer side of the front cover is provided with a front cover annular step, the side wall of the front cover annular step is provided with a front cover limiting protrusion, and the inner side wall of the end of the housing connected to the front cover is provided with a front cover limiting groove. When the front cover is placed inside the housing, the front cover limiting protrusion and the front cover limiting groove cooperate.

[0010] As an improvement of this utility model for a three-lobed coil motor in the electric screwdriver industry, a front bearing mounting groove is provided in the middle of the inner side of the front cover, a front bearing is provided in the front bearing mounting groove, a front sealing ring mounting groove is provided on the side wall of the front bearing mounting groove, a front sealing ring is provided in the front sealing ring mounting groove, and the front sealing ring is in contact with the front bearing.

[0011] As an improvement of this utility model for a three-lobed coil motor in the electric screwdriver industry, the rotor assembly includes a rotating shaft, one end of which passes through the front bearing and extends out from the front cover, and the other end of which passes through the rear bearing.

[0012] As an improvement of this utility model for a three-lobed coil motor in the electric screwdriver industry, the rotor assembly further includes a magnet, a balance block, and a copper sleeve. The magnet, balance block, and copper sleeve are all sleeved on the rotating shaft. The magnet is located between the balance block and the copper sleeve, and the balance block and the copper sleeve are tightly attached to the magnet.

[0013] As an improvement of this utility model for a three-lobed coil motor in the electric screwdriver industry, the rotor assembly further includes a spring, which is sleeved on the rotating shaft, with one end of the spring abutting against the front bearing and the other end abutting against the balance block.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. Improved Efficiency: The stacked three-lobed coil design helps improve motor efficiency. By increasing the number and distribution of coils, the utilization of the magnetic field can be optimized, energy loss reduced, and thus the motor operates more efficiently.

[0016] 2. Balancing Electromagnetic Force: The stacking of three coil segments into a cylindrical shape better balances electromagnetic force, reducing vibration and noise. This design makes the motor run more smoothly and extends its service life.

[0017] 3. High adaptability: The stacked three-lobed coil design allows the motor to adapt to different working environments and load requirements. It can operate stably at various speeds and torques, exhibiting good versatility. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the present invention;

[0019] Figure 2 This is a schematic diagram of the three-lobed coil stacking structure of this utility model;

[0020] Figure 3 This is a top view of the three-lobed coil of this utility model;

[0021] Figure 4 This is a schematic diagram of the front cover structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the back cover structure of this utility model;

[0023] The attached diagram is labeled as follows: 1. Housing, 2. Front cover, 3. Rear cover, 4. Rotor assembly, 5. Stator assembly, 6. PCB board, 7. Lead wire, 11. Bracket mounting step, 12. Bracket, 13. Rear cover limiting groove, 14. Front cover limiting groove, 21. Front cover annular step, 22. Front cover limiting protrusion, 23. Front bearing mounting groove, 24. Front bearing, 25. Front sealing ring mounting groove, 26. Front sealing ring, 31. Rear cover annular step, 32. Rear bearing mounting groove, 33. Rear bearing, 34. Rear sealing ring mounting groove, 35. Rear sealing ring, 36. Rear cover limiting protrusion, 37. Lead wire outlet hole, 41. Shaft, 42. Magnet, 43. Balance weight, 44. Copper sleeve, 45. Spring, 521. First coil, 522. Second coil, 523. Third coil, 524. Diamond-shaped through hole, 525. Connecting wire. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0027] like Figures 1-5 As shown, a three-lobed coil motor for the electric screwdriver industry includes a housing 1, a front cover 2, and a rear cover 3. The housing 1 houses a rotor assembly 4 and a stator assembly 5. The rotor assembly 4 is installed inside the housing 1 through the front cover 2 and the rear cover 3. The stator assembly 5 includes a stator core 51 and a cylindrical stator coil formed by three-lobed coils 52. The stator coil passes through the stator core 51 and is in close contact with the inner wall of the stator core 51. The rotor assembly 4 passes through the stator coil. The three-lobed coils 52 are a first coil 521, a second coil 522, and a third coil 523. One end of the first coil 521 is stacked on the inner side of the second coil 522, and the other end is stacked on the outer side of the third coil 523. The other end of the second coil 522 is stacked on the inner side of one end of the third coil 523.

[0028] Preferably, the first coil 521, the second coil 522, and the third coil 523 are all independent coils. The first coil 521, the second coil 522, and the third coil 523 are all wound from the inside to the outside using enameled wire. The first coil 521, the second coil 522, and the third coil 523 are all bent into an arc shape. The middle part of the first coil 521, the second coil 522, and the third coil 523 all have a diamond-shaped through hole 524.

[0029] Preferably, the inner side wall of the end of the housing 1 connected to the rear cover 3 is provided with a bracket mounting step 11, a bracket 12 is provided on the bracket mounting step 11, and a PCB board 6 is mounted on the bracket 12. The outer side of the rear cover 3 is provided with a rear cover annular step 31, which is embedded in the housing 1. The middle of the inner side of the rear cover 3 is provided with a rear bearing mounting groove 32, and a rear bearing 33 is provided in the rear bearing mounting groove 32. The side wall of the rear bearing mounting groove 32 is provided with a rear sealing ring mounting groove 34, and a rear sealing ring 35 is provided in the rear sealing ring mounting groove 34. The rear sealing ring 35 contacts the rear bearing 33.

[0030] The rear cover has a rear cover limiting protrusion 36 on the side wall of the annular step 31, and the inner side wall of the end of the housing 1 connected to the rear cover 3 is also provided with a rear cover limiting groove 13. When the rear cover 3 is placed inside the housing 1, the rear cover limiting protrusion 36 and the rear cover limiting groove 13 cooperate.

[0031] Preferably, the outer side of the back cover 3 is provided with a lead wire outlet hole 37, through which the lead wires 7 of the PCB board 6 pass. The connecting wires 525 of the first coil 521, the second coil 522 and the third coil 523 are all electrically connected to the PCB board 6.

[0032] Preferably, the outer side of the front cover 2 is provided with a front cover annular step 21, the side wall of the front cover annular step 21 is provided with a front cover limiting protrusion 22, and the inner side wall of the end of the housing 1 connected to the front cover 2 is provided with a front cover limiting groove 14. When the front cover 2 is placed inside the housing 1, the front cover limiting protrusion 22 and the front cover limiting groove 14 cooperate.

[0033] Preferably, the front cover 2 has a front bearing mounting groove 23 in the middle of its inner side, a front bearing 24 is provided in the front bearing mounting groove 23, a front sealing ring mounting groove 25 is provided on the side wall of the front bearing mounting groove 23, a front sealing ring 26 is provided in the front sealing ring mounting groove 25, and the front sealing ring 26 contacts the front bearing 24.

[0034] Preferably, the rotor assembly 4 includes a shaft 41, one end of which passes through the front bearing 24 and extends out of the front cover 2, and the other end of which passes through the rear bearing 33.

[0035] Preferably, the rotor assembly 4 further includes a magnet 42, a balance block 43, and a copper sleeve 44. The magnet 42, the balance block 43, and the copper sleeve 44 are all sleeved on the rotating shaft 41. The magnet 42 is located between the balance block 43 and the copper sleeve 44, and the balance block 43 and the copper sleeve 44 are in close contact with the magnet 42.

[0036] Preferably, the rotor assembly 4 further includes a spring 45, which is sleeved on the shaft 41. One end of the spring 45 abuts against the front bearing 24, and the other end abuts against the counterweight 43. The spring 45 can pre-tighten the rotor assembly 4 when the rear cover 3 is assembled.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and structure of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-lobed coil motor for use in the electric screwdriver industry, comprising a housing, wherein a rotor assembly and a stator assembly are disposed within the housing, characterized in that, The stator assembly includes a stator core and a cylindrical stator coil formed by three-lobed coils. The stator coils pass through the stator core and are in close contact with the inner wall of the stator core. The rotor assembly passes through the stator coils. The three-lobed coils are a first coil, a second coil, and a third coil. One end of the first coil is stacked on the inner side of the second coil, and the other end is stacked on the outer side of the third coil. The other end of the second coil is stacked on the inner side of one end of the third coil.

2. The three-lobed coil motor for the electric screwdriver industry according to claim 1, characterized in that, The first coil, the second coil, and the third coil are all independent coils. The first coil, the second coil, and the third coil are all made of enameled wire wound from the inside out. The first coil, the second coil, and the third coil are all bent into an arc shape. The middle part of the first coil, the second coil, and the third coil all have a diamond-shaped through hole.

3. The three-lobed coil motor for the electric screwdriver industry according to claim 1, characterized in that, It also includes a front cover and a rear cover. The rotor assembly is installed in the housing through the front cover and the rear cover. The inner side wall of the housing connected to the rear cover is provided with a bracket mounting step. A bracket is provided on the bracket mounting step, and a PCB board is mounted on the bracket. The outer side of the rear cover is provided with a rear cover annular step, which is embedded in the housing. The middle of the inner side of the rear cover is provided with a rear bearing mounting groove. A rear bearing is provided in the rear bearing mounting groove. A rear sealing ring mounting groove is provided on the side wall of the rear bearing mounting groove. A rear sealing ring is provided in the rear sealing ring mounting groove, and the rear sealing ring contacts the rear bearing. The rear cover has a rear cover limiting protrusion on the side wall of the annular step, and the inner side wall of the end of the housing connected to the rear cover also has a rear cover limiting groove. When the rear cover is placed inside the housing, the rear cover limiting protrusion and the rear cover limiting groove cooperate with each other.

4. The three-lobed coil motor for the electric screwdriver industry according to claim 3, characterized in that, The outer side of the back cover is provided with a lead wire outlet hole, through which the leads of the PCB board pass.

5. The three-lobed coil motor for the electric screwdriver industry according to claim 3, characterized in that, The outer side of the front cover is provided with a front cover annular step, and the side wall of the front cover annular step is provided with a front cover limiting protrusion. The inner side wall of the end of the housing connected to the front cover is provided with a front cover limiting groove. When the front cover is placed inside the housing, the front cover limiting protrusion and the front cover limiting groove cooperate.

6. The three-lobed coil motor for the electric screwdriver industry according to claim 5, characterized in that, The front cover has a front bearing mounting groove in the middle of its inner side, and a front bearing is installed in the front bearing mounting groove. A front sealing ring mounting groove is provided on the side wall of the front bearing mounting groove, and a front sealing ring is installed in the front sealing ring mounting groove. The front sealing ring is in contact with the front bearing.

7. The three-lobed coil motor for the electric screwdriver industry according to claim 6, characterized in that, The rotor assembly includes a shaft, one end of which passes through the front bearing and extends from the front cover, and the other end of which passes through the rear bearing.

8. The three-lobed coil motor for the electric screwdriver industry according to claim 7, characterized in that, The rotor assembly also includes a magnet, a counterweight, and a copper sleeve. The magnet, counterweight, and copper sleeve are all sleeved on the rotating shaft. The magnet is located between the counterweight and the copper sleeve, and the counterweight and the copper sleeve are in close contact with the magnet.

9. The three-lobed coil motor for the electric screwdriver industry according to claim 8, characterized in that, The rotor assembly also includes a spring, which is sleeved on the shaft, with one end of the spring abutting against the front bearing and the other end abutting against the balance block.

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