Motor rotor punching sheet

Abstract

The utility model provides a motor rotor punching sheet, and belongs to the technical field of motors. The problem that an existing punching sheet is large in magnetic flux leakage is solved. The motor rotor punching sheet comprises an annular body, a circle of magnetic steel grooves and a circle of magnetic isolation grooves axially penetrate through the body, the number of the magnetic isolation grooves and the number of the magnetic steel grooves are the same, the magnetic isolation grooves and the magnetic steel grooves are alternately distributed in the circumferential direction of the body, the magnetic isolation grooves and the magnetic steel grooves are strip-shaped, the length of each magnetic isolation groove extends in the radial direction of the body, and the length of each magnetic isolation groove is slightly larger than that of each magnetic steel groove. The two ends of the magnetic isolation grooves are closer to the inner and outer side surfaces of the body than the two ends of the magnetic steel grooves. Each magnetic steel groove is composed of an inner through hole, an outer through hole and a narrow groove, the two ends of the narrow groove are communicated with the inner through hole and the outer through hole respectively, the inner through hole and the outer through hole penetrate through the body in the axial direction, the inner through hole is located between the narrow groove and the inner side face of the body, the outer through hole is triangular, and the diameter of the outer through hole is gradually decreased in the direction of the narrow groove. The motor rotor punching sheet is less in magnetic flux leakage.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors and relates to a punching sheet, in particular to a motor rotor punching sheet. Background Art

[0002] The motor rotor is usually composed of a rotor core and a rotor shaft. The rotor core is generally made of rotor punchings, which are usually made of silicon steel sheets with excellent magnetic permeability and low hysteresis loss.

[0003] Existing rotors, such as a high-speed permanent magnet motor rotor structure disclosed in the China Patent Library (application number: 201710975245.X), include a rotor core, permanent magnets, and ventilation holes; the permanent magnets are divided into multiple pieces and embedded in the rotor core along the circumference of the rotor core, and the ventilation holes are distributed between adjacent permanent magnets; the motor adopts a 2-pole rotor structure, the rotor core is made of high-strength magnetic conductive carbon steel material, and the rotor core and the rotating shaft adopt an integrated structure; the permanent magnets are divided into multiple pieces and embedded in the rotor core along the circumference of the rotor core; the ventilation holes are distributed between adjacent permanent magnets.

[0004] The above rotor is provided with ventilation holes between two adjacent permanent magnets, which can enhance the overall heat dissipation of the rotor and reduce magnetic leakage. However, since the ventilation holes are arranged directly in the middle of the permanent magnets, the effect of the ventilation holes on reducing magnetic leakage is not very good, and the improvement of motor performance is not obvious. Utility Model Content

[0005] The utility model aims at the above problems existing in the prior art, and proposes a motor rotor punching sheet, and solves the technical problem of how to reduce magnetic flux leakage under the premise of ensuring strength.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a motor rotor punching sheet, including a ring-shaped body, a circle of magnetic steel grooves and a circle of magnetic isolation grooves axially penetrating the body, the number of magnetic isolation grooves and magnetic steel grooves is the same and the two are alternately distributed along the circumference of the body, the magnetic isolation grooves and the magnetic steel grooves are both long strips and the lengths extend along the radial direction of the body, characterized in that the length of the magnetic isolation groove is slightly larger than the length of the magnetic steel groove, and the two ends of the magnetic isolation groove are respectively closer to the inner and outer side surfaces of the body relative to the two ends of the magnetic steel groove; the magnetic steel groove is composed of an inner through hole, an outer through hole and a narrow groove whose two ends are respectively connected to the inner through hole and the outer through hole, the inner through hole and the outer through hole are both arranged to penetrate the body axially, the inner through hole is between the narrow groove and the inner side surface of the body, the outer through hole is triangular, and the diameter of the outer through hole gradually becomes smaller in the direction of the narrow groove.

[0007] The length of the magnetic isolation groove is slightly greater than that of the magnetic steel groove, and the two ends of the magnetic isolation groove are respectively closer to the inner and outer sides of the body, so as to effectively block or reduce the leakage magnetic flux between the magnetic poles, make the magnetic field more concentrated and stable, and enhance the performance of the motor.

[0008] Secondly, the inner through hole and the outer through hole are connected by a narrow groove, and the outer through hole is a triangle with the hole diameter gradually becoming smaller towards the narrow groove direction, so as to provide strong support for the outer wall of the body, ensure the radial compressive strength of the body, and make the rotor punching structure more stable.

[0009] In the above-mentioned motor rotor punching sheet, the above-mentioned inner through hole is composed of a front hole and a rear hole both of which are roughly V-shaped, the front hole and the rear hole are connected and distributed along the radial direction of the body, and one end of the narrow groove is connected to the corresponding front hole. The two ends of the narrow groove are respectively connected to the triangular outer through hole and the V-shaped front hole, which can further strengthen the support strength of the outer side of the body and enable the punching sheet to obtain stronger radial pressure resistance.

[0010] In the above-mentioned motor rotor punching sheet, the rear hole includes two side walls that are symmetrically arranged, and the two side walls of the rear hole are connected by a circular arc surface transition, so that the radial pressure resistance of the punching sheet is stronger.

[0011] In the above-mentioned motor rotor punching sheet, a circle of heat dissipation holes is axially penetrated through the body, and the heat dissipation holes are arranged close to the inner side surface of the body to enhance the overall heat dissipation of the punching sheet.

[0012] In the above-mentioned motor rotor punching sheet, the type of heat dissipation hole is a circular hole.

[0013] In the above-mentioned motor rotor punching sheet, the number of heat dissipation holes and magnetic steel slots is the same, and the above-mentioned heat dissipation holes are provided between each magnetic steel slot and the inner side surface of the body to ensure the strength of the punching sheet.

[0014] In the above-mentioned motor rotor punching sheet, a rivet hole is axially penetrated on the main body, and the above-mentioned rivet holes are provided between adjacent magnetic steel slots and magnetic isolation slots, so that the stacked punching sheets are stably connected to form a rotor core.

[0015] In the above-mentioned motor rotor punching sheet, the width of the narrow slot is 0.5 mm to 0.8 mm.

[0016] Compared with the prior art, the motor rotor punching has the following advantages:

[0017] 1. The length of the magnetic isolation groove is slightly larger than that of the magnetic steel groove, and the two ends of the magnetic isolation groove are closer to the inner and outer sides of the body respectively, so as to effectively block or reduce the leakage magnetic flux between the magnetic poles, make the magnetic field more concentrated and stable, and enhance the performance of the motor.

[0018] 2. The inner through hole and the outer through hole are connected by a narrow groove, and the outer through hole is a triangle with the hole diameter gradually becoming smaller in the direction of the narrow groove, so as to provide strong support for the outer wall of the body, ensure the radial compressive strength of the body, and make the rotor punching structure more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the rotor punching of this motor.

[0020] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0021] In the figure, 1, main body; 2, magnetic steel groove; 3, magnetic isolation groove; 3a, inner through hole; 3a1, front hole; 3a2, rear hole; 3b, outer through hole; 3c, narrow groove; 4, heat dissipation hole; 5, rivet hole. DETAILED DESCRIPTION

[0022] 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.

[0023] like Figure 1 As shown, the motor rotor punching sheet includes a ring-shaped body 1, and the body 1 is usually made of silicon steel sheet material.

[0024] Specifically,

[0025] The body 1 is axially penetrated by a circle of magnetic steel slots 2 and a circle of magnetic isolation slots 3, the number of magnetic isolation slots 3 and magnetic steel slots 2 is the same and the two are alternately distributed along the circumference of the body 1. Both the magnetic isolation slots 3 and the magnetic steel slots 2 are long strips and their lengths extend radially along the body 1.

[0026] like Figure 1 and Figure 2 As shown, the length of the magnetic isolation groove 3 is slightly greater than the length of the magnetic steel groove 2, and the two ends of the magnetic isolation groove 3 are closer to the inner and outer sides of the body 1 respectively than the two ends of the magnetic steel groove 2. Figure 1 As shown, the magnetic steel slot 2 is composed of an inner through hole 3a, an outer through hole 3b, and a narrow slot 3c whose two ends are connected to the inner through hole 3a and the outer through hole 3b respectively. At this time, the inner through hole 3a, the outer through hole 3b and the narrow slot 3c are continuously distributed along the radial direction of the body 1. Among them, the inner through hole 3a and the outer through hole 3b are both arranged to penetrate the body 1 axially, the inner through hole 3a is between the narrow slot 3c and the inner side of the body 1, the outer through hole 3b is triangular, and the outer through hole 3b gradually becomes smaller in the radial direction of the narrow slot 3c. Among them, the slot width of the narrow slot 3c is 0.5mm~0.8mm, and preferably this slot width is 0.6mm.

[0027] The length of the magnetic isolation groove 3 is slightly greater than that of the magnetic steel groove 2, and the two ends of the magnetic isolation groove 3 are respectively closer to the inner and outer sides of the body 1, so as to effectively block or reduce the leakage magnetic flux between the magnetic poles, making the magnetic field more concentrated and stable, and enhancing the motor performance.

[0028] Secondly, the inner through hole 3a and the outer through hole 3b are connected by a narrow groove 3c, and the outer through hole 3b is a triangle with the hole diameter gradually becoming smaller in the direction of the narrow groove 3c, so as to provide strong support for the outer wall of the body 1, ensure the radial compressive strength of the body 1, and make the rotor punching structure more stable.

[0029] Further explanation, such as Figure 1 and Figure 2 As shown, the inner through hole 3a is composed of a front hole 3a1 and a rear hole 3a2, both of which are roughly V-shaped. The front hole 3a1 and the rear hole 3a2 are connected and distributed radially along the body 1, and the front hole 3a1 and the rear hole 3a2 have opposite directions of aperture reduction. The front hole 3a1 is between the rear hole 3a2 and the narrow groove 3c, and one end of the narrow groove 3c is connected to the corresponding front hole 3a1. The two ends of the narrow groove 3c are respectively connected to the triangular outer through hole 3b and the V-shaped front hole 3a1, which can further strengthen the support strength of the outer side of the body 1 and enable the punching sheet to obtain a stronger radial pressure resistance.

[0030] The rear hole 3a2 includes two side walls that are symmetrically arranged, and the two side walls of the rear hole 3a2 are connected by a circular arc transition, so that the radial compression resistance of the punching sheet is stronger.

[0031] like Figure 1 As shown, the body 1 is also axially penetrated by a circle of heat dissipation holes 4, and the heat dissipation holes 4 are arranged close to the inner side of the body 1 to enhance the overall heat dissipation of the punching sheet. The heat dissipation holes 4 are preferably circular holes; the number of heat dissipation holes 4 and magnetic steel slots 2 is the same, and a heat dissipation hole 4 is arranged between each magnetic steel slot 2 and the inner side of the body 1 to ensure the strength of the punching sheet.

[0032] In the actual product, a rivet hole 5 is axially penetrated through the main body 1, and the rivet holes 5 are provided between the adjacent magnetic steel slots 2 and magnetic isolation slots 3, so that the stacked punching sheets are stably connected to form a rotor core.

[0033] 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.

Claims

1. A motor rotor punching sheet, comprising a ring-shaped body (1), a circle of magnetic steel slots (2) and a circle of magnetic isolation slots (3) axially penetrating the body (1), the magnetic isolation slots (3) and the magnetic steel slots (2) being the same in number and being alternately distributed along the circumference of the body (1), the magnetic isolation slots (3) and the magnetic steel slots (2) both being strip-shaped and extending in radial direction along the body (1), characterized in that: The length of the magnetic isolation groove (3) is slightly greater than the length of the magnetic steel groove (2), and the two ends of the magnetic isolation groove (3) are respectively closer to the inner and outer side surfaces of the body (1) than the two ends of the magnetic steel groove (2); the magnetic steel groove (2) is composed of an inner through hole (3a), an outer through hole (3b), and a narrow groove (3c) at both ends respectively connected to the inner through hole (3a) and the outer through hole (3b); the inner through hole (3a) and the outer through hole (3b) are both arranged to penetrate the body (1) axially; the inner through hole (3a) is located between the narrow groove (3c) and the inner side surface of the body (1); the outer through hole (3b) is triangular in shape, and the diameter of the outer through hole (3b) gradually decreases in the direction of the narrow groove (3c).

2. The motor rotor punching sheet according to claim 1, characterized in that: The internal through hole (3a) is composed of a front hole (3a1) and a rear hole (3a2) both of which are roughly V-shaped. The front hole (3a1) and the rear hole (3a2) are connected and distributed radially along the body (1). One end of the narrow groove (3c) is connected to the corresponding front hole (3a1).

3. The motor rotor punching sheet according to claim 2, characterized in that: The rear hole (3a2) comprises two side walls that are symmetrically arranged, and the two side walls of the rear hole (3a2) are connected by a transition of an arc surface.

4. The motor rotor punching sheet according to claim 1, characterized in that: A circle of heat dissipation holes (4) is also axially penetrated through the main body (1), and the heat dissipation holes (4) are arranged close to the inner side surface of the main body (1).

5. The motor rotor punching sheet according to claim 4, characterized in that: The heat dissipation hole (4) is a round hole.

6. The motor rotor punching sheet according to claim 1, characterized in that: The number of the heat dissipation holes (4) is the same as the number of the magnetic steel slots (2), and the heat dissipation holes (4) are provided between each magnetic steel slot (2) and the inner side surface of the body (1).

7. The motor rotor punching sheet according to claim 1, characterized in that: A rivet hole (5) is also axially penetrated through the main body (1), and the rivet hole (5) is provided between adjacent magnetic steel slots (2) and magnetic isolation slots (3).

8. The motor rotor punching sheet according to claim 1, characterized in that: The width of the narrow groove (3c) is 0.5 mm to 0.8 mm.

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