Stator and rotor of permanent magnet brushless motor

Abstract

The utility model provides a stator and a rotor of a permanent magnet brushless motor, belongs to the technical field of motors, and solves the problems that the structures on the stator and the rotor are the same, mechanical equipment is difficult to identify, and the temperature rise of the motor is caused by unbalanced magnetic circuits. The stator punching sheet comprises a stator punching sheet and a rotor punching sheet, the stator punching sheet is provided with a first positioning groove and a second positioning groove, the stator punching sheet is internally provided with wire grooves, each wire groove is provided with a semicircular groove bottom, an elliptical groove bottom and a planar groove bottom, wrapping posts are formed among the wire grooves, the wrapping posts are provided with first grooves and second grooves, the rotor punching sheet is provided with round holes, and the round holes are communicated with the grooves. Heat dissipation holes are arranged among the circular holes, saddle parts are arranged on the rotor punching sheet, magnetic steel grooves are arranged on the saddle parts, and interval grooves are arranged among the saddle parts. The stator punching sheet has the advantages that various different groove bottoms are arranged for the wire grooves, so that the magnetic circuit is balanced, the magnetic flux density is reduced, the temperature rise of the motor is reduced, the repeatability of the stator punching sheet structure is reduced due to the various wire grooves, and mechanical identification and assembly are facilitated; the rotor punching sheet is provided with spacing grooves and heat dissipation holes, thereby facilitating heat dissipation.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor parts and relates to a stator and rotor, in particular to a stator and rotor of a permanent magnet brushless motor. Background Art

[0002] The stator and rotor inside the permanent magnet brushless motor are made of punched silicon steel sheets. The stator is the fixed part inside the motor, and wire slots are opened on the stator, and coils are inserted into the wire slots; the rotating part inside the motor is the rotor, and magnetic steel slots are opened in the rotor, and magnets are installed in the magnetic steel slots. When the motor is powered on, the coil generates a magnetic field, which affects the magnets and causes the rotor to rotate, generating torque.

[0003] Existing motors are produced on assembly lines. The assembly process of the stator and rotor uses mechanical equipment, such as robotic arms and sensors. Since the stamped silicon steel sheets are circular and the internal structure is evenly distributed circumferentially, this can easily cause positioning and identification errors in the mechanical equipment, affecting production efficiency. At the same time, due to the same structure of the stator slots, magnetic circuit imbalance and excessive magnetic flux density are prone to occur, which can cause the motor temperature to rise and reduce the service life of the motor.

[0004] For example, in the motor stator and rotor punchings of patent number CN201920831015.0, the stator punchings are provided with stator threading grooves, the rotor punchings are provided with rotor grooves, the stator winding grooves and the rotor grooves are evenly distributed along the circumference, and the rotor grooves are composed of a first arc segment, a second arc segment and a straight line segment. The stator punchings are provided with a first positioning groove, and the rotor punchings are provided with a second positioning groove.

[0005] The main body of the stator punching sheet and rotor punching sheet of the above patent is circular, the stator wire threading grooves and rotor slots are evenly distributed along the circumference, the overall structure is similar, and it is difficult for mechanical equipment to identify during assembly, which affects production efficiency. The same stator wire threading grooves are prone to cause magnetic circuit imbalance and oversaturation of magnetic flux density, which increases the motor temperature. Utility Model Content

[0006] The utility model aims to solve the above problems existing in the prior art and provides a stator and rotor of a permanent magnet brushless motor with different stator slot sizes, which is convenient for positioning and assembling mechanical equipment.

[0007] The utility model can be implemented through the following technical scheme: a stator and rotor of a permanent magnet brushless motor, comprising a stator punching sheet and a rotor punching sheet, a plurality of wire grooves are opened on the stator punching sheet, winding columns are formed between the wire grooves, the wire grooves are opened with different groove bottoms, and the groove bottoms of the wire grooves are respectively semicircular groove bottoms, plane groove bottoms and elliptical groove bottoms, a positioning groove 1 is arranged on the outer ring of the stator punching sheet, a positioning groove 2 is arranged inside the stator punching sheet, and a circular hole is arranged on the rotor punching sheet.

[0008] In the stator and rotor of the permanent magnet brushless motor, heat dissipation holes are arranged between the circular holes, and the diameter of the heat dissipation holes is larger than that of the circular holes.

[0009] In the stator and rotor of the permanent magnet brushless motor, a plurality of first grooves and a plurality of second grooves are provided on both sides of the winding post, and the first grooves and the second grooves are staggered.

[0010] In the stator and rotor of the permanent magnet brushless motor, the angle difference between the semicircular groove bottom and the positioning groove 1 is 45 degrees, and the semicircular groove bottom is evenly distributed along the circumferential direction.

[0011] In the stator and rotor of the permanent magnet brushless motor, the semicircular groove bottom, the plane groove bottom and the elliptical groove bottom are centrally symmetrically distributed.

[0012] In the above-mentioned stator and rotor of the permanent magnet brushless motor, saddles are arranged on the rotor punching sheets, spacing grooves are opened between the saddles, and magnetic steel grooves are arranged in the saddles.

[0013] Compared with the prior art, the advantages of the utility model are: a plurality of different types of wire slots are provided to balance the magnetic circuit, reduce the temperature rise of the motor, and improve the service life of the motor; a positioning groove for locating the position of the stator punching sheet is provided outside the stator punching sheet, and then wire slots with different groove types are provided inside the stator. The wire slots with different internal structures are convenient for mechanical equipment to identify and locate, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the stator and rotor of the permanent magnet brushless motor;

[0015] Figure 2 It is a front view of the stator punching sheet of the stator and rotor of the permanent magnet brushless motor;

[0016] Figure 3 It is a front view of the rotor punching of the stator and rotor of the permanent magnet brushless motor;

[0017] Figure 4 yes Figure 2 The enlarged image in the middle circle A;

[0018] Among them, 1. stator punching sheet; 11. wire slot; 111. semicircular slot bottom; 112. flat slot bottom; 113. elliptical slot bottom; 12. positioning slot one; 13. positioning slot two; 2. rotor punching sheet; 21. round hole; 22. heat dissipation hole; 23. saddle; 231. magnetic steel slot; 24. spacing slot; 3. winding column; 31. groove one; 32. groove two. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0020] like Figures 1 to 4 As shown, the utility model can be implemented through the following embodiments: a stator and rotor of a permanent magnet brushless motor, including a stator punching sheet 1 and a rotor punching sheet 2, a plurality of wire slots 11 are opened on the stator punching sheet 1, winding columns 3 are formed between the wire slots 11, the wire slots 11 are opened with different slot bottoms, and the slot bottoms of the wire slots 11 are respectively a semicircular slot bottom 111, a plane slot bottom 112 and an elliptical slot bottom 113, a positioning groove 12 is arranged on the outer ring of the stator punching sheet 1, a positioning groove 2 13 is arranged inside the stator punching sheet 1, and a circular hole 21 is arranged on the rotor punching sheet 2.

[0021] The wire slot 11 on the stator punching sheet 1 has a variety of different slot bottoms, which makes the magnetic circuit balanced, reduces the occurrence of magnetic flux saturation, and reduces the temperature rise of the motor; the positioning slot 12, the positioning slot 2 and the circular hole 21 are used to locate the installation position of the stator punching sheet 1 and the rotor punching sheet 2, which is convenient for positioning the stator and rotor during welding and assembly.

[0022] like Figure 1 and Figure 3 As shown, heat dissipation holes 22 are arranged between the circular holes 21, and the diameter of the heat dissipation holes 22 is larger than the circular holes 21. The heat dissipation holes 22 are arranged to dissipate heat from the inside of the rotor. When the rotor rotates, the heat dissipation holes 22 rotate and stir the air to improve the heat dissipation efficiency.

[0023] like Figure 2 and Figure 4 As shown, a plurality of grooves 1 31 and a plurality of grooves 2 32 are provided on both sides of the winding post 3, and the grooves 1 31 and the grooves 2 32 are staggered. The provision of the grooves 1 31 and the grooves 2 32 facilitates the winding operation on the winding post 3, ensures that the coils are arranged neatly, and prevents the coils from cross-contacting, which causes the temperature rise of the motor to increase; the staggered distribution of the grooves 1 31 and the grooves 2 32 causes the harmonic peaks of the magnetic field generated by the coil to be staggered, ensures that the magnetic circuit is unobstructed, and reduces the heating of the coil.

[0024] like Figure 1 and Figure 2 As shown, the angle difference between the semicircular groove bottom 111 and the positioning groove 12 is 45 degrees, and the semicircular groove bottom 111 is evenly distributed along the circumference. The semicircular groove bottom 111 is used for mechanical identification and positioning and starting assembly operations. The 45-degree angle difference is used to prevent the robot arm from starting assembly from the positioning groove 12, causing the mechanical equipment to conflict with the positioning structure.

[0025] like Figure 1 and Figure 2 As shown, the semicircular groove bottom 111, the plane groove bottom 112 and the elliptical groove bottom 113 are centrally symmetrically distributed. The centrally symmetrically distributed semicircular groove bottom 111, the plane groove bottom 112 and the elliptical groove bottom 113 facilitate balancing the magnetic circuit and preventing magnetic flux saturation.

[0026] like Figure 1 and Figure 3 As shown, the rotor punching 2 is provided with a saddle 23, a spacing groove 24 is provided between the saddles 23, and a magnetic steel groove 231 is provided in the saddle 23. The saddle 23 and the spacing groove 24 are provided to separate the magnetic steel groove 231 to prevent the magnetic steels installed in the magnetic steel groove 231 from interfering with each other, resulting in abnormal temperature rise at the magnetic steel.

[0027] The working principle of the utility model is as follows: the stator composed of the stator punching sheet 1 is placed on the assembly equipment, the positioning groove 12 and the positioning groove 2 13 cooperate to place the stator in the same shape, which is convenient for the assembly of the mechanical equipment, the wire groove 11 of the semicircular groove bottom 111 is used for mechanical equipment identification and as a signal for assembly and assembly operations, and the coil winding and magnetic steel installation are started; the circular hole 21 on the rotor punching sheet 2 is used to locate and limit the displacement of the rotor punching sheet 2, and the heat dissipation hole 22 and the spacing groove 24 stir the air when the rotor composed of the rotor punching sheet 2 is working.

[0028] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0029] Although various terms are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A stator and rotor of a permanent magnet brushless motor, characterized in that: The invention comprises a stator punching sheet (1) and a rotor punching sheet (2), wherein a plurality of wire slots (11) are provided on the stator punching sheet (1), winding poles (3) are formed between the wire slots (11), the wire slots (11) are provided with different slot bottoms, and the slot bottoms of the wire slots (11) are respectively a semicircular slot bottom (111), a plane slot bottom (112) and an elliptical slot bottom (113), a first positioning slot (12) is provided on the outer ring of the stator punching sheet (1), a second positioning slot (13) is provided inside the stator punching sheet (1), and a round hole (21) is provided on the rotor punching sheet (2).

2. The stator and rotor of a permanent magnet brushless motor according to claim 1, characterized in that: Heat dissipation holes (22) are provided between the circular holes (21), and the diameter of the heat dissipation holes (22) is larger than that of the circular holes (21).

3. The stator and rotor of a permanent magnet brushless motor according to claim 1, characterized in that: A plurality of first grooves (31) and a plurality of second grooves (32) are provided on both sides of the winding pole (3), and the first grooves (31) and the second grooves (32) are staggered in distribution.

4. The stator and rotor of a permanent magnet brushless motor according to claim 1, characterized in that: The angle difference between the semicircular groove bottom (111) and the first positioning groove (12) is 45 degrees, and the semicircular groove bottom (111) is evenly distributed along the circumferential direction.

5. The stator and rotor of a permanent magnet brushless motor according to claim 1, characterized in that: The semicircular groove bottom (111), the plane groove bottom (112) and the elliptical groove bottom (113) are centrally symmetrically distributed.

6. The stator and rotor of a permanent magnet brushless motor according to claim 1, characterized in that: The rotor punching sheet (2) is provided with a saddle portion (23), a spacing groove (24) is provided between the saddle portions (23), and a magnetic steel groove (231) is provided in the saddle portion (23).

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