Motor armature core and stator using same

Abstract

The invention discloses a motor armature iron core and a stator using the same, the motor armature iron core comprises an iron core formed by laminating a plurality of iron core sheets, the outer ring of each iron core sheet is provided with accommodating grooves which are uniformly arranged at intervals, and the outer ring of the iron core sheet between two adjacent accommodating grooves is provided with a blocking shoulder. The two ends of each blocking shoulder partially block the corresponding containing grooves respectively, each blocking shoulder is provided with a groove or an L-shaped notch so that the outer side edge of each blocking shoulder can form a lower step and an upper step, each groove is arranged towards the front end of the corresponding blocking shoulder, and each L-shaped notch is formed in the front end of the corresponding blocking shoulder. A surface magnetic curve on the surface is restrained upwards in a stepped mode, so that interaction of the armature iron core and the rotor rotates in a certain direction, magnetic induction intensity in the radius direction is reduced, the rotating torque of the rotor is greatly reduced, and a motor with the motor as a stator is more stable under low-speed movement and easier to start. And the problem caused by the positioning torque is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of motors, in particular to an armature core of a motor and a stator using the armature core. Background Art

[0002] In the existing technology, the armature core in a general single-phase motor is composed of stacked armature silicon steel punchings with a tooth structure. This type of tooth structure will interact with the motor rotor when the motor is not powered on to generate a positioning torque. The positioning torque will cause the motor to become unstable when moving at low speeds, causing pulsation, which will adversely affect the performance of the motor.

[0003] Specifically, the causes of the positioning torque include the following three aspects: 1. Cogging effect: The stator of the motor usually has multiple slots. When the rotor rotates, the magnetic flux of the permanent magnet will interact with the slot structure of the stator. Due to the existence of the slots, the magnetic flux density will change between the slots, resulting in torque fluctuations; 2. Uneven distribution of magnetic flux: When the magnetic flux generated by the rotor permanent magnet passes through the stator slots, the magnetic flux distribution is uneven due to the geometric structure of the slots. This unevenness will produce a periodic magnetic pull, causing the rotor to be subject to greater attraction at certain positions, thereby forming a positioning torque; 3. Change in magnetic resistance: When the rotor rotates, the magnetic resistance caused by the stator slots varies at different positions. This difference will cause the rotor to experience periodic changes in resistance during rotation, thereby generating a positioning torque.

[0004] The detent torque has many effects on the performance and application of the motor: 1. Low-speed performance: When running at low speed, the positioning torque will cause the motor speed to be unstable and pulsate, which is particularly unfavorable for applications that require precise positioning and stable speed control, such as servo motors and stepper motors; 2. Noise and vibration: The periodic fluctuation of the positioning torque will cause vibration and noise of the motor, affecting the running stability and service life of the motor; 3. Efficiency and heat generation: The positioning torque will increase the power consumption of the motor during startup and low-speed operation, reduce the efficiency of the motor, and may cause the motor to heat up, affecting the reliability and life of the motor; 4. Increased control difficulty: In order to overcome the influence of positioning torque, more complex control algorithms such as vector control or direct torque control are usually required, which increases the complexity and cost of the control system.

[0005] Therefore, an armature core structure of a single-phase motor is proposed to reduce the problem of the generation of the detent torque. Summary of the invention

[0006] The purpose of the present invention is to solve the problems in the prior art and to propose a motor armature core and a rotor using the armature core, which can greatly reduce the rotational torque on the rotor, making the motor using the present invention as the stator more stable at low speeds and easier to start, thus avoiding the problems caused by the positioning torque.

[0007] To achieve the above-mentioned purpose, the present invention proposes an armature core of a motor, comprising an iron core formed by a plurality of stacked iron core sheets, the outer rings of the iron core sheets are provided with accommodating grooves evenly spaced, the outer rings of the iron core sheets between two adjacent accommodating grooves are provided with blocking shoulders, the two ends of the blocking shoulders partially block the corresponding accommodating grooves respectively, the blocking shoulders are provided with grooves or L-shaped notches so that the outer sides of the blocking shoulders form lower steps and upper steps, the grooves are arranged toward the front end of the blocking shoulders, and the L-shaped notches are arranged at the front end of the blocking shoulders.

[0008] Preferably, the groove wall and the groove bottom of the groove are both plane.

[0009] Preferably, the plurality of iron core sheets include a plurality of first iron core sheets, a plurality of second iron core sheets and a plurality of third iron core sheets, two second iron core sheets are arranged between two adjacent first iron core sheets and a third iron core sheet located between the two second iron core sheets, the first iron core sheets are provided with first cooling holes arranged at intervals in a circular shape, the second iron core sheets are provided with waist-shaped holes arranged at intervals in a circular shape, the third iron core sheets are provided with second cooling holes arranged at intervals in a circular shape, the first cooling holes are connected to the upper ends of the adjacent waist-shaped holes, and the second cooling holes are connected to the lower ends of the adjacent waist-shaped holes.

[0010] Preferably, a resin sealing layer is provided on the inner wall of the cooling channel formed by the first cooling hole, the waist-shaped hole and the second cooling hole.

[0011] Preferably, the inner circles of the first core sheet, the second core sheet and the third core sheet are all provided with positioning protrusions.

[0012] A motor stator comprises a shaft, an armature core, a core frame and two clamping bodies, wherein the shaft is provided with a core frame, the core frame is sleeved with the armature core, both ends of the core frame are provided with clamping bodies sleeved on the shaft, the clamping bodies are used to clamp the armature core, the armature core is the motor armature core described above, the front and rear ends of the shaft are respectively provided with a first blind hole and a second blind hole, the clamping bodies are provided with a plurality of connecting channels, the connecting channel on the front clamping body is used to connect the first blind hole with the frontmost first cooling hole, and the connecting channel on the rear clamping body is used to connect the second blind hole with the rearmost first cooling hole.

[0013] Preferably, two first sealing rings are provided between the clamping body and the shaft body, an annular groove connected to the connecting channel is provided on the inner wall of the clamping body between the two first sealing rings, and a connecting hole is provided on the circumferential surface of the shaft body for connecting the first blind hole and the second blind hole with the corresponding annular groove.

[0014] Preferably, a plurality of second sealing rings are provided on the inner wall of the compression body, and the corresponding connecting passages and the first cooling holes are sealed by a second sealing ring.

[0015] Preferably, the pressing body is fixedly connected to the core frame by screws, and a circumferential surface of the core frame is provided with a positioning groove matching with the positioning protrusion.

[0016] Beneficial effects of the present invention: The present invention forms a lower step and an upper step on the outer side of the blocking shoulder by providing a groove or an L-shaped notch on the blocking shoulder. The groove is arranged toward the front end of the blocking shoulder, and the L-shaped notch is arranged at the front end of the blocking shoulder. This structure constrains the surface magnetic curve to the upper step, so that the interaction between the armature core and the rotor is rotated in a certain direction, and the magnetic induction intensity along the radial direction is reduced, which greatly reduces the rotational torque on the rotor, making the motor with the present invention as the stator more stable under low-speed movement, easier to start, and avoiding the problems caused by the positioning torque.

[0017] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an armature core of a motor in Example 1; Figure 2 is a schematic structural diagram of an armature core of a motor according to Embodiment 2; Figure 3 is a cross-sectional view of an armature core of a motor in Example 1; Figure 4 It is a cross-sectional structural diagram of a motor stator of the present invention.

[0019] In the figure: 1-iron core, 2-accommodating groove, 3-blocking shoulder, 4-groove, 5-L-shaped notch, 6-lower step, 7-upper step, 8-first iron core sheet, 9-second iron core sheet, 10-third iron core sheet, 11-first cooling hole, 12-waist-shaped hole, 13-second cooling hole, 20-axis body, 21-armature core, 22-core frame, 23-pressing body, 24-first blind hole, 25-second blind hole, 26-connecting channel, 27-first sealing ring, 28-connecting hole, 29-annular groove, 210-second sealing ring, 211-screw. DETAILED DESCRIPTION

[0020] Example 1 See also Figure 1 , Figure 3 The present invention provides an armature core of a motor, comprising an iron core 1 formed by stacking a plurality of iron core sheets, the outer rings of the iron core sheets are provided with accommodating grooves 2 evenly spaced, the outer rings of the iron core sheets between two adjacent accommodating grooves 2 are provided with blocking shoulders 3, the two ends of the blocking shoulders 3 partially block the corresponding accommodating grooves 2 respectively, the blocking shoulders 3 are provided with grooves 4 so that the outer sides of the blocking shoulders 3 form a lower step 6 and an upper step 7, the grooves 4 are arranged toward the front end of the blocking shoulder 3, and the L-shaped notch 5 is arranged at the front end of the blocking shoulder 3.

[0021] The groove wall and the groove bottom of the groove 4 are both flat.

[0022] The plurality of iron core sheets include a plurality of first iron core sheets 8, a plurality of second iron core sheets 9 and a plurality of third iron core sheets 10. Two second iron core sheets 9 and a third iron core sheet 10 are arranged between two adjacent first iron core sheets 8. The first iron core sheets 8 are provided with first cooling holes 11 arranged at intervals in a circular shape. The second iron core sheets 9 are provided with waist-shaped holes 12 arranged at intervals in a circular shape. The third iron core sheets 10 are provided with second cooling holes 13 arranged at intervals in a circular shape. The first cooling holes 11 are connected to the upper ends of the adjacent waist-shaped holes 12, and the second cooling holes 13 are connected to the lower ends of the adjacent waist-shaped holes 12.

[0023] The inner wall of the cooling channel formed by the first cooling hole 11, the waist-shaped hole 12 and the second cooling hole 13 is provided with a resin sealing layer.

[0024] The inner circles of the first core sheet 8 , the second core sheet 9 and the third core sheet 10 are all provided with positioning protrusions 12 .

[0025] See also Figure 4 A motor stator, characterized in that it includes a shaft body 20, an armature core 21, a core frame 22 and two pressing bodies 23, the shaft body 20 is provided with a core frame 22, the core frame 22 is sleeved with the armature core 21, both ends of the core frame 22 are provided with pressing bodies 23 sleeved on the shaft body 20, the pressing bodies 23 are used to clamp the armature core 21, the armature core 21 is the motor armature core described above, the front and rear ends of the shaft body 20 are respectively provided with a first blind hole 24 and a second blind hole 25, the pressing bodies 23 are provided with a plurality of connecting channels 26, the connecting channel 26 on the front pressing body 23 is used for the first blind hole 24 to communicate with the first cooling hole 11 at the front, and the connecting channel 26 on the rear pressing body 23 is used for the second blind hole 25 to communicate with the first cooling hole 11 at the rear.

[0026] Two first sealing rings 27 are provided between the clamping body 23 and the shaft body 20 , and an annular groove 29 connected to the connecting channel 26 is provided on the inner wall of the clamping body 23 between the two first sealing rings 27 . A connecting hole 28 is provided on the circumferential surface of the shaft body 20 for connecting the first blind hole 24 and the second blind hole 25 with the corresponding annular groove 29 .

[0027] A plurality of second sealing rings 210 are disposed on the inner wall of the pressing body 23 , and the corresponding connecting passages 26 and the first cooling holes 11 are sealed by a second sealing ring 210 .

[0028] The pressing body 23 is fixedly connected to the core frame 22 by means of screws 211 , and a circumferential surface of the core frame 22 is provided with a positioning groove matched with the positioning protrusion 12 .

[0029] Example 2 See also Figure 2 , Figure 3 The difference between Example 2 and Example 1 is that an L-shaped notch 5 is provided on the blocking shoulder 3 so that the outer side of the blocking shoulder 3 forms a lower step 6 and an upper step 7.

[0030] Working process of the present invention: During operation of a motor stator of the present invention, water or air enters the first blind hole 24, and then enters the corresponding cooling channel through the front connecting hole 28, the annular groove 29 and the connecting channel 26 in sequence, and then passes through the rear connecting channel 26, the annular groove 29 and the connecting hole 28 in sequence, and finally enters the second blind hole 25 and is discharged.

[0031] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A motor armature core, characterized in that: The invention comprises an iron core (1) formed by stacking a plurality of iron core sheets, wherein the outer rings of the iron core sheets are provided with receiving grooves (2) arranged at even intervals, and the outer rings of the iron core sheets between two adjacent receiving grooves (2) are provided with blocking shoulders (3), and the two ends of the blocking shoulders (3) respectively partially block the corresponding receiving grooves (2), and the blocking shoulders (3) are provided with grooves (4) or L-shaped notches (5) so that the outer sides of the blocking shoulders (3) form lower steps (6) and upper steps (7), and the grooves (4) are arranged toward the front end of the blocking shoulders (3), and the L-shaped notches (5) are arranged at the front end of the blocking shoulders (3).

2. The motor armature core according to claim 1, characterized in that: The groove wall and the groove bottom of the groove (4) are both flat.

3. The motor armature core according to claim 1, characterized in that: The plurality of iron core sheets include a plurality of first iron core sheets (8), a plurality of second iron core sheets (9) and a plurality of third iron core sheets (10), two second iron core sheets (9) and a third iron core sheet (10) are arranged between two adjacent first iron core sheets (8), the first iron core sheets (8) are provided with first cooling holes (11) arranged at intervals in a circumferential shape, the second iron core sheets (9) are provided with waist-shaped holes (12) arranged at intervals in a circumferential shape, the third iron core sheets (10) are provided with second cooling holes (13) arranged at intervals in a circumferential shape, the first cooling holes (11) are communicated with the upper ends of the adjacent waist-shaped holes (12), and the second cooling holes (13) are communicated with the lower ends of the adjacent waist-shaped holes (12).

4. The motor armature core according to claim 3, characterized in that: The inner wall of the cooling channel formed by the first cooling hole (11), the waist-shaped hole (12) and the second cooling hole (13) is provided with a resin sealing layer.

5. The motor armature core according to claim 1, characterized in that: The inner rings of the first core sheet (8), the second core sheet (9) and the third core sheet (10) are all provided with positioning protrusions (12).

6. A motor stator, characterized in that: The invention comprises a shaft (20), an armature core (21), a core frame (22) and two clamping bodies (23), wherein the shaft (20) is provided with a core frame (22), the armature core (21) is sleeved on the core frame (22), and both ends of the core frame (22) are provided with clamping bodies (23) sleeved on the shaft (20), the clamping bodies (23) are used to clamp the armature core (21), and the armature core (21) is the armature core (21) according to any one of claims 1 to 4. The armature core of the machine, the front and rear ends of the shaft body (20) are respectively provided with a first blind hole (24) and a second blind hole (25), the pressing body (23) is provided with a plurality of connecting channels (26), the connecting channel (26) on the front pressing body (23) is used for connecting the first blind hole (24) with the first cooling hole (11) at the front, and the connecting channel (26) on the rear pressing body (23) is used for connecting the second blind hole (25) with the first cooling hole (11) at the rear.

7. A motor stator as claimed in claim 6, characterized in that: Two first sealing rings (27) are provided between the pressing body (23) and the shaft body (20); an annular groove (29) communicating with the communication channel (26) is provided on the inner wall of the pressing body (23) between the two first sealing rings (27); and a communication hole (28) is provided on the circumferential surface of the shaft body (20) for communicating the first blind hole (24) and the second blind hole (25) with the corresponding annular groove (29).

8. A motor stator as claimed in claim 6, characterized in that: The inner wall of the compression body (23) is provided with a plurality of second sealing rings (210), and the corresponding connecting passages (26) and the first cooling holes (11) are sealed via a second sealing ring (210).

9. A motor stator as claimed in claim 6, characterized in that: The pressing body (23) is fixedly connected to the core frame (22) via screws (211), and a circumferential surface of the core frame (22) is provided with a positioning groove that matches the positioning protrusion (12).

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