Coreless motor

Abstract

The utility model relates to a coreless motor, which comprises a shell, an upper end cover and a lower end cover, the upper end cover and the lower end cover are both fixed on two axial sides of the shell, an iron core is fixed on the inner side wall of the shell, a coil is fixed on the inner side wall of the iron core, bearings are arranged at the centers of the upper end cover and the lower end cover, and a rotating shaft is arranged through the bearings. A magnetic shoe unit is fixed to the rotating shaft and located on the inner side of the coil. A circuit board is installed on the lower end cover, an insulating sheath is installed between the circuit board and the lower end cover, a stator sheath is installed between the circuit board and the iron core, a notch is formed in one side of the circumferential wall of the lower end cover, and a communication line connected with the circuit board is led out of the shell along the notch; the lower end cover is in clearance fit with the bearing, a sealing rubber ring is mounted between the lower end cover and the bearing, and the upper end cover is in interference fit connection with the bearing; the utility model has the advantages that the bearing is not easy to damage during installation, the shaft runs stably and the space is compact.

Description

Technical Field

[0001] The utility model belongs to the technical field of coreless motors, and particularly relates to a coreless motor. Background Art

[0002] A coreless motor is a high-efficiency energy conversion device, belonging to DC, permanent magnet, servo micro and special motors, and having outstanding energy-saving characteristics, sensitive and convenient control characteristics and stable operation characteristics; in terms of structure, it breaks through the traditional rotor structure form of the motor. During the installation process of the rotor, bearings are installed at both ends of the rotor. In the existing structure, the bearings are rigidly assembled with the end covers. Therefore, it is easy to damage the bearings when assembling the bearings on the end covers. Therefore, a flexible assembly connection is developed between the bearings and the end covers on the market. However, there will be a problem that the shaft at the output end of the coreless motor will shake during high-speed operation. In addition, a circuit board is connected to one end of the stator. In the existing structure, the circuit board is directly fixed on the end cover. Therefore, the fixing method of the circuit board and the lead position both play a role in the operation stability and space compactness of the entire coreless motor. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies existing in the prior art, and to provide a coreless motor with bearings that are not easily damaged during installation, stable shaft operation and compact space.

[0004] The purpose of the utility model is completed through the following technical solutions. This coreless motor includes a housing, an upper end cover and a lower end cover. The upper end cover and the lower end cover are both fixed on the axial two sides of the housing. A iron core is fixed on the inner side wall of the housing, and a coil is fixed on the inner side wall of the iron core. Bearings are installed at the centers of the upper end cover and the lower end cover, and a rotating shaft is installed through the bearings. A magnetic tile unit is fixed on the rotating shaft, and the magnetic tile unit is located inside the coil; a circuit board is installed on the lower end cover, and an insulating sheath is installed between the circuit board and the lower end cover. A stator sheath is installed between the circuit board and the iron core. A notch is opened on one side of the circumferential wall of the lower end cover, and a communication line connected to the circuit board is led out of the housing along the notch; the lower end cover and the bearing are in clearance fit, and a sealing rubber ring is installed between them. The upper end cover and the bearing are connected by interference fit.

[0005] The beneficial effects of the present utility model are as follows: Compared with the prior art, by installing stator sheaths and insulating sheaths at both the upper and lower positions of the circuit board, the circuit board is not affected by the magnetism of the magnetic tile unit or the coil, greatly improving the stability of the motor operation. At the same time, the communication line is led out of the housing through the notch provided on the lower end cover, making the space compactness of the entire motor better. Moreover, the upper end cover and the bearing are rigidly matched, so that the shaft at the output end of the coreless motor does not experience radial jitter during high-speed operation. The lower end cover and the bearing are flexibly connected through a sealing rubber ring, making it not easy to damage the bearing when assembling the bearing on the rotating shaft and the lower end cover, and the noise and vibration during the operation of the motor are also significantly improved.

[0006] Preferably, a circular embedding groove is provided on the inner side wall of the lower end cover, and the embedding groove is located at the middle position in the height direction of the inner side wall of the lower end cover. The sealing rubber ring is embedded in the embedding groove and abuts against the bearing; through the setting of the above structure, the sealing rubber ring can be well embedded in the embedding groove and abut against the bearing to achieve the flexible connection between the bearing and the lower end cover.

[0007] Preferably, the height of the iron core and the height of the magnetic tile unit are both lower than the height of the coil, and the height of the iron core is higher than the height of the magnetic tile unit. The magnetic tile unit and the iron core are both located at the central position in the height direction of the coil; through the setting of the above structure, the operation efficiency of the magnetic tile unit is higher and more stable, and the magnetic force after the coil is energized acts on the magnetic tile unit.

[0008] Preferably, the stator sheath abuts against the lower part of the iron core and is sleeved outside the coil, and a circular limiting groove is provided on one end face of the stator sheath. The circuit board is located on the limiting groove; in this way, the stator sheath isolates the circuit board from the iron core, and the circuit board is located on the limiting groove, and the stability after installation is better.

[0009] Preferably, one end of the stator sheath is provided with a stop block arranged along the height direction of the housing, and the bottom of the stop block is flush with the bottom of the housing; by providing the stop block, when the communication line is led out of the housing, it will not be rigidly matched with the housing, which greatly reduces the breakage of the communication line.

[0010] Preferably, the insulating sheath is placed in the placing groove provided on the lower end cover, and a plurality of cushion blocks are provided on the upper end face of the insulating sheath. The cushion blocks abut against the circuit board; in this way, by providing the insulating sheath, the circuit board is isolated and insulated from the lower end cover, and by providing the cushion blocks, the circuit board is prevented from vibrating during the high-speed operation of the motor, and the noise is significantly improved.

[0011] Preferably, one end of the insulating sheath is provided with a wire block arranged along the circumferential direction of the insulating sheath, and the wire block abuts against the notch. By providing the wire block, the communication wire can be led out of the housing along the wire block, which is more convenient for wire leading, and thus the structure of the entire motor is more compact. Description of the Drawings

[0012] Figure 1 is a schematic front sectional view of the cup-shaped hollow motor of the present invention.

[0013] Figure 2 is a schematic view of the stator sheath structure of the present invention.

[0014] Figure 3 is a schematic view of the insulating sheath structure of the present invention.

[0015] Figure 4 is a schematic view of the circuit board in the stator sheath of the present invention.

[0016] The reference numerals in the drawings are respectively: 1, housing; 2, upper end cover; 3, lower end cover; 4, iron core; 5, coil; 6, bearing; 7, rotating shaft; 8, magnetic tile unit; 9, circuit board; 10, insulating sheath; 11, stator sheath; 12, communication wire; 13, sealing rubber ring; 31, notch; 32, embedding groove; 33, placing groove; 91, groove; 10-1, cushion block; 10-2, wire block; 11-1, limiting groove; 11-2, stop block; 11-3, limiting block. Detailed Embodiment

[0017] The following will introduce the present invention in detail with reference to the drawings: As shown in the attached Figures 1 to 4As shown in the figure, the utility model includes a housing 1, an upper end cover 2 and a lower end cover 3. The upper end cover 2 and the lower end cover 3 are both fixed on the axial two sides of the housing 1. A iron core 4 is fixed on the inner side wall of the housing 1, and a coil 5 is fixed on the inner side wall of the iron core 4. Bearings 6 are installed at the centers of the upper end cover 2 and the lower end cover 3 respectively. A rotating shaft 7 is installed through the bearings 6. A magnetic tile unit 8 is fixed on the rotating shaft 7, and the magnetic tile unit 8 is located inside the coil 5. A circuit board 9 is installed on the lower end cover 3, and an insulating sheath 10 is installed between the circuit board 9 and the lower end cover 3. A stator sheath 11 is installed between the circuit board 9 and the iron core 4. A notch 31 is opened on one side of the circumferential wall of the lower end cover 3, and a communication line 12 connected to the circuit board 9 is led out of the housing 1 along the notch 31. The lower end cover 3 and the bearing 6 are in clearance fit, and a sealing rubber ring 13 is installed between them. The upper end cover 2 and the bearing 6 are in interference fit connection. The magnetic tile unit 8 has at least two and is arranged in sequence along the axial direction of the rotating shaft 7. Each magnetic tile unit 8 is composed of at least two magnetic tiles combined. Each magnetic tile is fixed on the circumferential wall of the rotating shaft 7 through an adhesive and surrounds to form a cylindrical magnetic tile unit 8.

[0018] A ring of embedding grooves 32 is provided on the inner side wall of the lower end cover 3. The embedding grooves 32 are located at the middle position in the height direction of the inner side wall of the lower end cover 3. The sealing rubber ring 13 is embedded in the embedding grooves 32, and the sealing rubber ring 13 abuts against the bearing 6.

[0019] The height of the iron core 4 and the height of the magnetic tile unit 8 are both lower than the height of the coil 5, and the height of the iron core 4 is higher than the height of the magnetic tile unit 8. The magnetic tile unit 8 and the iron core 4 are both located at the central position in the height direction of the coil 5.

[0020] The stator sheath 11 abuts against the lower part of the iron core 4 and is sleeved outside the coil 5. A ring of limiting grooves 11-1 is opened on one end face of the stator sheath 11, and the circuit board 9 is located on the limiting grooves 11-1.

[0021] One end of the stator sheath 11 is provided with a stop block 11-2 arranged along the height direction of the housing 1, and the bottom of the stop block 11-2 is flush with the bottom of the housing 1.

[0022] The insulating sheath 10 is placed in a placing groove 33 provided on the lower end cover 3, and a plurality of cushion blocks 10-1 are provided on the upper end face of the insulating sheath 10. The cushion blocks 10-1 abut against the circuit board 9.

[0023] One end of the insulating sheath 10 is provided with a wire block 10-2 arranged along the circumferential direction of the insulating sheath 10, and the wire block 10-2 abuts against the notch 31.

[0024] A channel for the communication line 12 to penetrate is left between the stop block 11-2 and the wire block 10-2, so that the communication line 12 is led out from the side of the housing. Compared with the existing communication line led out from the lower part of the lower end cover, the structure is more compact.

[0025] A limiting block 11-3 is further provided on the limiting groove 11-1 of the stator sheath 11, and a groove 91 is provided on the circuit board 9 that is limited with the limiting block 11-3. When the circuit board 9 and the stator sheath 11 are installed in a limited manner, a good limiting effect is obtained between the circuit board 9 and the stator sheath 11, thereby further preventing the circuit board from vibrating during the high-speed operation of the motor, and the noise will be significantly improved.

[0026] The installation process of the present utility model is as follows: First, the outer shell 1 is fixed on the outer circumferential wall of the lower end cover 3, and the sealing rubber ring 13 is embedded into the embedding groove 32 of the lower end cover 3, and then the bearing 6 is installed into the lower end cover 3 and abuts against the sealing rubber ring 13; Then, the insulating sheath 10, the circuit board 9, and the stator sheath 11 are installed in sequence, and the iron core 4 and the coil 5 are installed into the housing 1; Finally, the rotating shaft 7 with the magnetic tile unit 8 passes through the circuit board 9 and is assembled into the bearing 6 on the lower end cover 3, and then the upper end cover 2 is fixed on the upper end of the housing 1.

[0027] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A coreless motor, comprising a housing (1), an upper end cover (2) and a lower end cover (3), wherein the upper end cover (2) and the lower end cover (3) are both fixed on the two axial sides of the housing (1), and is characterized in that: A iron core (4) is fixed on the inner side wall of the housing (1), a coil (5) is fixed on the inner side wall of the iron core (4), bearings (6) are installed at the centers of the upper end cover (2) and the lower end cover (3), a rotating shaft (7) is installed through the bearings (6), a magnetic tile unit (8) is fixed on the rotating shaft (7), and the magnetic tile unit (8) is located inside the coil (5); a circuit board (9) is installed on the lower end cover (3), and an insulating sheath (10) is installed between the circuit board (9) and the lower end cover (3), a stator sheath (11) is installed between the circuit board (9) and the iron core (4), a notch (31) is formed on one side of the circumferential wall of the lower end cover (3), and a communication line (12) connected to the circuit board (9) is led out of the housing (1) along the notch (31); a clearance fit is provided between the lower end cover (3) and the bearing (6), and a sealing rubber ring (13) is installed between them, and an interference fit connection is provided between the upper end cover (2) and the bearing (6).

2. The can-stack motor according to claim 1, wherein: A circle of embedding grooves (32) are provided on the inner side wall of the lower end cover (3), the embedding grooves (32) are located at the middle position in the height direction of the inner side wall of the lower end cover (3), the sealing rubber ring (13) is embedded in the embedding grooves (32), and the sealing rubber ring (13) abuts against the bearing (6).

3. The cup-shaped motor according to claim 1, wherein: The height of the iron core (4) and the height of the magnetic tile unit (8) are both lower than the height of the coil (5), and the height of the iron core (4) is higher than the height of the magnetic tile unit (8), and the magnetic tile unit (8) and the iron core (4) are both located at the central position in the height direction of the coil (5).

4. The can-stack motor according to claim 1, wherein: The stator sheath (11) abuts against the lower part of the iron core (4) and is sleeved outside the coil (5), and a circle of limiting grooves (11-1) are formed on one end face of the stator sheath (11), and the circuit board (9) is located on the limiting grooves (11-1).

5. The cup-shaped motor according to claim 4, wherein: One end of the stator sheath (11) is provided with a stop block (11-2) arranged along the height direction of the housing (1), and the bottom of the stop block (11-2) is flush with the bottom of the housing (1).

6. The can-stack motor according to claim 1, wherein: The insulating sheath (10) is placed in a placing groove (33) provided on the lower end cover (3), and a plurality of cushion blocks (10-1) are provided on the upper end face of the insulating sheath (10), and the cushion blocks (10-1) abut against the circuit board (9).

7. The cup-shaped motor according to claim 6, characterized in that: One end of the insulating sheath (10) is provided with a wire block (10-2) arranged along the circumference of the insulating sheath (10), and the wire block (10-2) abuts against the notch (31).

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