Permanent magnet rotor skewed pole structure for reducing torque ripple

Abstract

The utility model discloses a permanent magnet rotor skewed pole structure for reducing torque pulsation, relates to the technical field of motors, and solves the problems of high cost, difficulty in manufacturing and inconvenience in heat dissipation in the conventional torque pulsation suppression method. The rotor comprises a shaft, a plurality of shaft sleeves and a plurality of rotor cores, and the shaft sleeves are sleeved on the shaft and are connected through keys; the rotor cores sleeve the shaft sleeves and are connected through keys, and the rotor cores and the shaft sleeves are in one-to-one correspondence; a first key groove is formed in the inner ring of the shaft sleeve, and a second key groove is formed in the outer ring. The key grooves I among the shaft sleeves are formed in the same position, and the key grooves II are formed in different positions; and a plurality of permanent magnets are arranged on the rotor core. According to the utility model, the key slots with different angles are processed on the shaft sleeve, so that the mounting angle change of the rotor iron core is realized, and the effect of staggered arrangement of magnetic poles among the plurality of rotor iron cores is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely is a permanent magnet rotor skew pole structure of reducing torque ripple. BACKGROUND

[0002] Permanent magnet synchronous motor is easy to produce the unstable torque size pulsation phenomenon when operating, causes vibration, noise and the control precision of system etc.

[0003] At present, the conventional permanent magnet motor adopts the way of stator skew slot to reduce torque ripple, but this way has a defect, to ensure the process, first, increase the straight line length, enlarge the skew gap, in this way, the end size of coil is enlarged, the use amount of copper is increased, the material cost is increased, and the copper consumption is increased. UTILITARY MODEL

[0004] The utility model discloses a permanent magnet rotor skew pole structure of reducing torque ripple, which solves the problems of high cost, difficult manufacturing and poor heat dissipation of the existing methods for suppressing torque ripple.

[0005] The utility model discloses a permanent magnet rotor skew pole structure of reducing torque ripple, which solves the problems of high cost, difficult manufacturing and poor heat dissipation of the existing methods for suppressing torque ripple.

[0006] Further, the permanent magnets are arranged in groups of two on the rotor core, and each group of permanent magnets is arranged in a V shape with the V-shaped opening facing outward.

[0007] Further, the utility model further comprises two balance rings, which are sleeved on the shaft and clamp the plurality of rotor cores in the middle.

[0008] Further, the balance ring is provided with a balance groove, and a balance block is arranged in the balance groove.

[0009] Further, an interference fit is adopted between the balance ring and the shaft.

[0010] Further, an interference fit is adopted between the shaft sleeve and the shaft.

[0011] Further, a transition fit is adopted between the shaft sleeve and the rotor core.

[0012] The permanent magnet rotor skew pole structure for reducing torque pulsation has the advantages that:

[0013] (1) The permanent magnet rotor skew pole structure for reducing torque pulsation overcomes the problems of high cost, manufacturing difficulty and poor heat dissipation of the prior torque pulsation suppression method, realizes the installation angle change between the plurality of rotor cores by machining the key grooves with different angles on the shaft sleeve, achieves the effect of staggered arrangement of the magnetic poles between the plurality of rotor cores, stabilizes the torque output, reduces the vibration and noise in the rotation process of the rotating shaft, improves the control precision and user experience effect, simplifies the mold and process flow, and reduces the manufacturing difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the present application illustrated in the drawings are provided to explain the present application and are not meant to limit the present application.

[0015] In the drawings:

[0016] Figure 1 is a structural schematic view of the permanent magnet rotor skew pole structure for reducing torque pulsation;

[0017] Figure 2 is a structural schematic view of the shaft sleeve one of the permanent magnet rotor skew pole structure for reducing torque pulsation;

[0018] Figure 3 is a structural schematic view of the shaft sleeve two of the permanent magnet rotor skew pole structure for reducing torque pulsation;

[0019] Figure 4 is a structural schematic view of the shaft sleeve three of the permanent magnet rotor skew pole structure for reducing torque pulsation;

[0020] Figure 5 is a structural schematic view of the shaft sleeve four of the permanent magnet rotor skew pole structure for reducing torque pulsation;

[0021] Figure 6 is a structural schematic view of the shaft sleeve five of the permanent magnet rotor skew pole structure for reducing torque pulsation;

[0022] Figure 7 is a skew pole schematic diagram of the permanent magnet rotor skew pole structure reducing torque ripple, according to the utility model discloses a kind of permanent magnet rotor skew pole structure reducing torque ripple;

[0023] Figure 8 is the structure schematic diagram of the rotor core of the permanent magnet rotor skew pole structure reducing torque ripple, according to the utility model discloses a kind of permanent magnet rotor skew pole structure reducing torque ripple;

[0024] Figure 9 is the partial section view of the balance ring of the permanent magnet rotor skew pole structure reducing torque ripple, according to the utility model discloses a kind of permanent magnet rotor skew pole structure reducing torque ripple;

[0025] Wherein: 1-axis, 2-balance ring, 3-bush, 4-rotor core, 5-permanent magnet, 6-key groove one, 7-key groove two, 8-balance slot. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be described clearly and completely below with reference to the drawings, obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] Specific implementation method one: See Figures 1-9 This embodiment is described in detail. The permanent magnet rotor skewed pole structure for reducing torque pulsation described in this embodiment specifically includes a shaft 1, several bushings 3, and several rotor cores 4. Several bushings 3 are fitted onto the shaft 1, and a long keyway with a key is provided on the shaft 1. The shaft 1 and the bushings 3 are connected by the key, and the bushings 3 and shaft 1 are fitted with an interference fit. The rotor cores 4 are fitted onto the bushings 3 and connected by the key, with a one-to-one correspondence between the rotor cores 4 and bushings 3. The bushings 3 and rotor cores 4 are fitted with a transition fit. A first keyway 6 is provided on the inner ring of the bushing 3, and the bushing 3 is connected to the key on the shaft 1 through the first keyway 6. A second keyway 7 is provided on the outer ring of the bushing 3, and it is connected to the keyway on the inner ring of the rotor core 4 through the second keyway 7 and the key. Figures 2-6 As shown, the keyway 6 between several bushings 3 is set in the same position, while the keyway 7 is set in different positions, so that the rotation angle between several rotor cores 4 is different, causing the permanent magnets 5 between several rotor cores 4 to be interleaved. Figure 2 In the middle, the center lines of keyway 6 and keyway 7 of bushing 1 are collinear; Figure 3 In the middle, the included angle α between the center lines of keyway 6 and keyway 7 of bushing 2 is 1.25 degrees; Figure 4 In the middle, the included angle b between the center lines of keyway 6 and keyway 7 of bushing 3 is 2.5 degrees; Figure 5 In the middle, the included angle c between the center lines of keyway 6 and keyway 7 of bushing 4 is 3.75 degrees; Figure 6 In the middle, the center line angle d between the keyway 6 and keyway 7 of the bushing 5 is 5 degrees; several permanent magnets 5 are provided on the rotor core 4.

[0031] The permanent magnets 5 are arranged in pairs, with each pair of permanent magnets 5 arranged in a V-shape on the rotor core 4, the V-shaped opening facing outwards. Several pairs of permanent magnets 5 are evenly distributed around the circumference of the rotor core 4. Figure 8 As shown.

[0032] It also includes two balancing rings 2, which are fitted onto the shaft 1 and clamp several rotor cores 4 in the middle. For example... Figure 9 As shown, the balance ring 2 is provided with a balance groove 8, and a balance block is provided in the balance groove 8, so that the center of gravity of the whole device is on the axis of shaft 1. The balance ring 2 and shaft 1 are interference fit.

[0033] Summarizing the above implementation cases, the permanent magnet rotor skew pole structure for reducing torque ripple has the advantages of overcoming the problems of high cost, difficult manufacturing and being not conducive to heat dissipation of the prior method for suppressing torque ripple, realizing the installation angle change between the plurality of rotor cores 4 by machining the key grooves with different angles on the shaft sleeve 3, achieving the effect of staggered arrangement of magnetic poles between the plurality of rotor cores 4, stabilizing the torque output, reducing the vibration and noise in the rotation process of the rotating shaft, improving the control precision, improving the user experience effect, simplifying the mold and the process flow, and reducing the manufacturing difficulty.

[0034] The above-described specific embodiments further specifically describe the purposes, technical solutions and beneficial effects of the utility model. It should be understood that the above-described specific embodiments are merely specific embodiments of the utility model and are not used to limit the utility model, and the utility model can also be a reasonable combination of the features described in the above-described embodiments, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A permanent magnet rotor skew pole structure to reduce torque ripple, characterized by: It includes shaft (1), several shaft sleeves (3) and several rotor cores (4), several shaft sleeves (3) are sleeved on the shaft (1) and are connected through keys; the rotor core (4) is sleeved on the shaft sleeve (3) and is connected through keys, the rotor core (4) and the shaft sleeve (3) correspond one by one; the inner ring of the shaft sleeve (3) is provided with key groove one (6), and the outer ring is provided with key groove two (7); the key groove one (6) between the several shaft sleeves (3) is arranged at the same position, and the key groove two (7) is arranged at different positions; the rotor core (4) is provided with several permanent magnets (5).

2. The permanent magnet rotor skew pole structure for reducing torque pulsation according to claim 1, characterized in that: The permanent magnet (5) is in a group of two, and each group of permanent magnets (5) is arranged in a V shape on the rotor core (4), and the V-shaped opening faces outward.

3. The permanent magnet rotor skew pole structure for reducing torque ripple according to claim 1, characterized in that: It also includes two balance rings (2), the balance ring (2) is sleeved on the shaft (1), and several rotor cores (4) are clamped in the middle.

4. The permanent magnet rotor skew pole structure of claim 3, wherein: The balance ring (2) is provided with a balance groove (8), and the balance groove (8) is provided with a balance block.

5. The permanent magnet rotor skew pole structure of claim 4, wherein: The balance ring (2) and the shaft (1) adopt interference fit.

6. The permanent magnet rotor skewed pole structure for reduced torque pulsation of claim 1, wherein: The shaft sleeve (3) and the shaft (1) adopt interference fit.

7. The permanent magnet rotor skewed pole structure for reduced torque pulsation of claim 1, wherein: The shaft sleeve (3) and the rotor core (4) adopt transition fit.

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