Rotor structure of self-starting permanent magnet synchronous motor

Abstract

A self-starting permanent magnet synchronous motor rotor structure comprises a rotor body, a squirrel cage and a transmission shaft, the rotor body comprises the transmission shaft, a rotor iron core and a plurality of permanent magnets, the rotor iron core is in a hollow cylinder shape, and the permanent magnets are symmetrically arranged on the rotor iron core in pairs. The mouse cage is movably sleeved outside the rotor body and is fixedly connected with the rotor body through a connecting piece, the mouse cage comprises a fixed bus bar iron core, a bus bar, a bus bar groove and a bus bar parallel end ring, and the inner diameter of the bus bar parallel end ring is larger than the outer diameter of the rotor iron core. According to the utility model, the mouse cage is detachably connected with the rotor body, so that the permanent magnets are prevented from being demagnetized or adsorbing nearby iron powder and scrap iron due to the fact that the mouse cage and the rotor body cannot be separated in the welding process.

Description

Technical Field

[0001] The utility model relates to an automatic permanent magnet synchronous motor rotor structure, in particular to a self-starting permanent magnet synchronous motor rotor structure. Background Art

[0002] Currently, if Figure 3-4 As shown, the rotor portion of a commercially available self-starting permanent magnet synchronous motor typically consists of a first fixed conductive core, first conductive bar slots 4', and first rotor core 2', forming a generally integral rotor structure. A first drive shaft 1' then passes through the center of the first rotor core 2'. A conductive cage is then fabricated on the outside of the integral rotor. The cage's first conductive bars 5' are positioned within the first conductive bar slots 4'. The cage is typically fabricated using cast aluminum or welded copper bars. However, both these methods require high temperatures, which can easily demagnetize the first permanent magnets 3'. Furthermore, during the fabrication process, the first permanent magnets 3' are susceptible to attracting nearby iron powder and iron filings.

[0003] Therefore, it is necessary to design a self-starting permanent magnet synchronous motor rotor structure that can avoid the demagnetization of the permanent magnet and the adsorption of iron powder and iron filings during the manufacturing process of the conductive squirrel cage. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to design a self-starting permanent magnet synchronous motor rotor structure, in which the cage and the rotor body are integrated and movably connected by a connecting piece, so as to avoid demagnetization of the permanent magnet due to the manufacturing process of the conductive cage, avoid the adsorption of iron powder and iron chips during the processing, and reduce the manufacturing difficulty.

[0005] To achieve the above-mentioned objectives, the present invention provides a self-starting permanent magnet synchronous motor rotor structure, comprising a rotor body, a cage and a transmission shaft; the rotor body comprises a rotor core and a plurality of permanent magnets, the rotor core being in the shape of a hollow cylinder, the plurality of permanent magnets being symmetrically arranged in pairs on the rotor core, the cage being movably sleeved on the outside of the rotor body and fixedly connected to the rotor body via a connecting member, the cage comprising a fixed conductive bar core, conductive bars, conductive bar slots and conductive bar parallel end rings, the inner diameter of the conductive bar parallel end rings being larger than the outer diameter of the rotor core, the rotor body being inserted into the interior of the cage through the conductive bar parallel end ring at one end of the cage, and the transmission shaft passing through the rotor body and the cage along the axial direction of the rotor body.

[0006] Furthermore, the fixed conductive bar core is in a hollow cylindrical shape and is sleeved on the outer circumferential surface of the rotor core.

[0007] Furthermore, the connecting member is a screw, and threaded through holes for the screw to pass through are provided on the side walls of the conductive bar core and the rotor core.

[0008] Furthermore, there are a plurality of conductive bar slots, and the plurality of conductive bar slots are evenly arranged on the outer wall of the fixed conductive bar core.

[0009] Furthermore, the conductive bars are embedded in the conductive bar slots, and the number of the conductive bars matches the number of the conductive bar slots.

[0010] Furthermore, there are two parallel end rings of the conductive bar, and the two parallel end rings of the conductive bar are fixedly connected to the two ends of the conductive bar respectively.

[0011] Furthermore, the permanent magnets are arranged along the axial direction of the rotor core.

[0012] After adopting the above technical solution, the beneficial effect of the utility model is as follows: since the rotor structure of the self-starting permanent magnet synchronous motor of the utility model integrates the cage and the rotor body into one body, and the two are independently manufactured and then detachably connected by a connecting piece, it is possible to avoid demagnetization of the permanent magnet due to the high temperature of welding during the manufacturing process of the conductive cage, and it is also possible to avoid the permanent magnet from absorbing iron powder and iron filings during the manufacturing process of the conductive cage, thereby improving production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A top view of a rotor of a self-starting permanent magnet synchronous motor according to an embodiment of the present utility model;

[0014] Figure 2 This is a front view of a rotor of a self-starting permanent magnet synchronous motor according to an embodiment of the present utility model;

[0015] Figure 3 A top view of a rotor of an existing self-starting permanent magnet synchronous motor;

[0016] Figure 4 It is a front view of the rotor of the existing self-starting permanent magnet synchronous motor.

[0017] The accompanying drawings are marked as follows: 1, transmission shaft; 2, rotor core; 3, permanent magnet; 4, conductive bar slot; 5, fixed conductive bar core; 6, connector; 7, conductive bar; 8, conductive bar parallel end ring;

[0018] 1', first transmission shaft; 2', first rotor core; 3', first permanent magnet; 4', first conductive bar slot; 5', first conductive bar. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below by way of embodiments:

[0020] The utility model provides a self-starting permanent magnet synchronous motor rotor structure, combined with Figures 1-2 As shown, the rotor of a self-starting permanent magnet synchronous motor includes a rotor body, a cage, and a drive shaft 1. The rotor body includes a rotor core 2 and a plurality of permanent magnets 3. The drive shaft 1 passes through the rotor core 2 and is coaxial with the rotor core 2. The permanent magnets 3 are embedded in the rotor core 2. The cage is movably mounted on the outside of the rotor body and is fixedly connected to the rotor body via a connector 6. The cage includes a fixed conductive bar core 5, conductive bars 7, conductive bar slots 4, and conductive bar parallel end rings 8.

[0021] Specifically, a plurality of permanent magnets 3 are symmetrically arranged in pairs along the axial direction of the rotor core 2 .

[0022] Specifically, the inner diameter of the conductive bar parallel end ring 8 is larger than the outer diameter of the rotor core 2 .

[0023] During manufacturing, the cage and rotor body are first independently manufactured. The cage is formed into a single unit by casting aluminum or welding copper bars to form the conductive bar core 5, conductive bars 7, conductive bar slots 4, and conductive bar parallel end rings 8. The drive shaft 1, rotor core 2, and permanent magnet 3 are also formed into a single unit. Because the inner diameter of the conductive bar parallel end ring 8 is larger than the outer diameter of the rotor core 2, the rotor body can be directly inserted into the cage through the conductive bar parallel end ring 8 at one end of the cage. Finally, the cage and rotor body are connected together using a connector 6, completing the manufacturing process of the self-starting permanent magnet synchronous motor rotor structure. Since the cage and rotor body are integrated into one unit and are then removably connected via the connector 6 after being independently manufactured, demagnetization of the permanent magnets due to high temperatures during the manufacturing process of the conductive cage can be avoided. It can also prevent the permanent magnets from attracting iron powder and iron filings during the manufacturing process of the conductive cage, thereby improving production quality.

[0024] Specifically, the fixed conductive bar core 5 is in a hollow cylindrical shape and is sleeved on the outside of the rotor core 2 , with conductive bar parallel end rings 8 fixedly connected at both ends.

[0025] Specifically, there are multiple conductive bar slots 4 , which are evenly arranged on the outer wall of the fixed conductive bar core 5 . The number of conductive bars 7 matches the number of conductive bar slots 4 , and the conductive bars 7 are embedded in the conductive bar slots 4 .

[0026] In this embodiment, the squirrel cage and the rotor body are fixedly connected by screws. In other embodiments, they can also be connected by other connecting members 6, such as pins, as long as the squirrel cage and the rotor body can be detachably connected.

[0027] It should be noted that Figures 3-4The figure shows the rotor structure of the current permanent magnet synchronous motor. The difference from the present invention is that the first squirrel cage and the first rotor body of the existing permanent magnet synchronous motor rotor are integrally formed, while the squirrel cage and the rotor body of the present invention are detachably connected, which can avoid the permanent magnet being demagnetized by high temperature due to the inseparable squirrel cage and rotor body during the welding process.

[0028] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A self-starting permanent magnet synchronous motor rotor structure, comprising a rotor body, a squirrel cage, and a transmission shaft, wherein the rotor body comprises a rotor core and a plurality of permanent magnets; the rotor core is hollow cylindrical, and is characterized in that: The plurality of permanent magnets are symmetrically arranged in pairs on the rotor core. The squirrel cage is movably mounted on the outside of the rotor body and fixedly connected to the rotor body through a connector. The squirrel cage includes a fixed conductive bar core, conductive bars, conductive bar slots, and conductive bar parallel end rings. The inner diameter of the conductive bar parallel end ring is larger than the outer diameter of the rotor core. The rotor body is inserted into the squirrel cage through the conductive bar parallel end ring at one end of the squirrel cage. The transmission shaft passes through the rotor body and the squirrel cage along the axial direction of the rotor body.

2. The self-starting permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: The fixed conductive bar core is in the shape of a hollow cylinder and is sleeved on the outer peripheral surface of the rotor core.

3. The self-starting permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: The connecting piece is a screw, and threaded through holes for the screw to pass through are provided on the side walls of the conductive bar core and the rotor core.

4. The self-starting permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: There are a plurality of conductive bar slots, and the plurality of conductive bar slots are evenly arranged on the outer wall of the fixed conductive bar core.

5. The self-starting permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: The conductive strips are embedded in the conductive strip slots, and the number of the conductive strips matches the number of the conductive strip slots.

6. The self-starting permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: There are two conductive bar parallel end rings, and the two conductive bar parallel end rings are fixedly connected to the two ends of the conductive bar respectively.

7. The self-starting permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: The permanent magnets are arranged along the axial direction of the rotor core.

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