Low-voltage small-center high permanent magnet synchronous motor rotor structure

Abstract

The utility model discloses a rotor structure of a low-voltage small-center high permanent magnet synchronous motor. The rotor structure comprises a rotating shaft, a rotor iron core sleeved on the rotating shaft, magnetic steel assembled on the rotor iron core and magnetic steel baffle plates positioned at two ends of the rotor iron core, wherein the magnetic steel baffle plate is provided with a groove for placing the balance block and a fastener for fastening the balance block in the groove; the groove comprises a groove bottom and a groove opening, and the width of the groove bottom is larger than that of the groove opening. The balance block can be limited in the groove and fixed on the magnetic steel baffle plate through the fastener, so that two existing independent balance rings can be reduced, the cost is reduced, and the market competitiveness of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor structure of a low-voltage small center-height permanent magnet synchronous motor. Background Art

[0002] A motor refers to an electromagnetic device that realizes the conversion or transmission of electrical energy based on the law of electromagnetic induction. A common type of motor is a permanent magnet motor, which usually includes a stator structure and a rotor structure. A magnetic steel is assembled inside the rotor structure and is used to interact with the rotating magnetic field generated by the stator structure, thereby generating the output of the motor. As the rotating mechanism of the permanent magnet motor, the rotor structure needs to adjust the dynamic balance to meet the application requirements. Generally, balance rings are respectively fixed at both ends of the rotor structure. The balance rings are used to place balance blocks during the dynamic balance test of the rotor structure. By adding balance blocks in the grooves of the balance rings, the rotor structure can meet the dynamic balance requirements. However, the setting of the balance rings increases the cost of the rotor structure and affects the competitiveness of the product in the market.

[0003] Therefore, it is necessary to develop a rotor structure of a low-voltage small center-height permanent magnet synchronous motor to solve the above technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a rotor structure of a low-voltage small center-height permanent magnet synchronous motor.

[0005] To achieve the above-mentioned utility model purpose, the utility model adopts the following technical scheme: A rotor structure of a low-voltage small center-height permanent magnet synchronous motor, which includes a rotating shaft, a rotor core sleeved on the rotating shaft, a magnetic steel assembled on the rotor core, and magnetic steel baffles located at both ends of the rotor core; wherein, the magnetic steel baffles are provided with grooves for placing balance blocks and fasteners for fastening the balance blocks in the grooves; the grooves include a groove bottom and a groove opening, and the width of the groove bottom is greater than the width of the groove opening.

[0006] As a further improved technical scheme of the utility model, the groove is an annular groove, and the cross-section of the groove is trapezoidal.

[0007] As a further improved technical scheme of the utility model, fastening holes matched with the fasteners are arranged in the grooves.

[0008] As a further improved technical scheme of the utility model, the aperture of the fastening hole is greater than the width of the groove bottom of the groove.

[0009] As a further improved technical scheme of the utility model, there are two fastening holes, and the two fastening holes are distributed in the annular groove with a difference of 180 degrees.

[0010] As a further improved technical scheme of the utility model, the fastener is a fastening screw.

[0011] As a further improved technical solution of the present utility model, the magnet steel baffle further includes four uniformly distributed holding holes, a holding screw and a washer for fixing the magnet steel baffle to the rotor core.

[0012] As a further improved technical solution of the present utility model, the magnet steel baffle further includes a shaft hole that cooperates with the rotating shaft. The four holding holes are distributed in a circumferential manner, and the groove is arranged between the shaft hole and the holding holes.

[0013] As a further improved technical solution of the present utility model, the depth of the groove is less than 1 / 4 of the thickness of the magnet steel baffle and greater than 1 / 7 of the thickness of the magnet steel baffle.

[0014] As a further improved technical solution of the present utility model, the groove further includes inclined side walls on both sides, and the inclination angle ranges from 75° to 85°.

[0015] The beneficial effect of the present utility model is that the balance weight can be limited in the groove and fixed to the magnet steel baffle through fasteners, which can reduce the existing two separate balance rings, reduce costs, and improve the market competitiveness of the product. Description of the Drawings

[0016] Figure 1 is a structural schematic diagram of the rotor structure of the low-voltage small center height permanent magnet synchronous motor of the present utility model;

[0017] Figure 2 is Figure 1 the enlarged schematic diagram of the middle circle A in;

[0018] Figure 3 is a structural schematic diagram of the magnet steel baffle of the rotor structure of the low-voltage small center height permanent magnet synchronous motor of the present utility model;

[0019] Figure 4 is a cross-sectional schematic diagram of the magnet steel baffle of the rotor structure of the low-voltage small center height permanent magnet synchronous motor of the present utility model;

[0020] Figure 5 is Figure 4 the enlarged schematic diagram of the middle circle B in. Detailed Embodiments

[0021] The following will describe the present utility model in detail with reference to the embodiments shown in the drawings. Please refer to the drawings, which are the preferred embodiments of the present utility model. However, it should be noted that these embodiments are not limitations on the present utility model, and any equivalent transformation or substitution in terms of function, method, or structure made by those of ordinary skill in the art based on these embodiments shall fall within the protection scope of the present utility model.

[0022] Please referFigures 1 to 5 , the present utility model discloses a rotor structure 100 of a low-voltage and small center height permanent magnet synchronous motor, which includes a rotating shaft 1, a rotor core 2 sleeved on the rotating shaft 1, a permanent magnet 3 assembled on the rotor core 2, and magnet retainers 4 located at both ends of the rotor core 2. Among them, the magnet retainer 4 is provided with a groove 41 for placing a balance weight 200 and a fastener 42 for fastening the balance weight 200 in the groove 41. The groove 41 includes a groove bottom 411 and a groove opening 412, and the width of the groove bottom 411 is greater than the width of the groove opening 412. The balance weight 200 can be limited in the groove 41 and fixed on the magnet retainer 4 through the fastener 42, which can reduce the existing two separate balance rings, reduce costs, and improve the market competitiveness of products. The magnet retainer 4 is compatible with the balance weight 200, improves the resistance of the magnet retainer 4 to the permanent magnet 3, increases its stability, reduces material costs and process costs, and has a weight reduction effect and a function of reducing the overall size.

[0023] Specifically, the groove 41 is a circular annular groove, and the cross-section of the groove 41 is integrally trapezoidal. The groove 41 further includes inclined side walls 413 located on both sides, and the inclination angle ranges from 75° to 85°, such as 75°, 80° or 85°. The balance ring 200 is clamped by the fact that the width of the groove bottom 411 is greater than the width of the groove opening 412 and the inclined side walls 413 to ensure the stability of the balance ring 200. The depth of the groove 41 is less than 1 / 4 of the thickness of the magnet retainer 4 and greater than 1 / 7 of the thickness of the magnet 4 retainer, which can effectively install the balance ring 200 and ensure the stability of the structure.

[0024] Specifically, fastening holes 414 are provided in the groove 41 and are matched with the fastener 42. The aperture of the fastening hole 414 is greater than the width of the groove bottom 411 of the groove 41, which is beneficial to stably and safely fix the balance ring 200. There are two fastening holes 414, and the two fastening holes 414 are distributed in the annular groove with a difference of 180 degrees to improve the fastening property. Preferably, the fastener 42 is a fastening screw.

[0025] Specifically, the magnet retainer 4 further includes four uniformly distributed holding holes 43, a holding screw 44 for fixing the magnet retainer 4 to the rotor core 2, and a washer 45. The magnet retainer 4 is stably held on the rotor core 2 to improve its stability. The magnet retainer 4 can not only be stably fastened but also stably install the balance ring 200.

[0026] The magnet retainer 4 further includes a shaft hole 46 matched with the rotating shaft 1. The four holding holes 43 are distributed in a circumferential manner, and the groove 41 is arranged between the shaft hole 46 and the holding holes 43 to achieve the installation stability of the magnet retainer 4 and the stability of assembling the balance ring 200.

[0027] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0028] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present utility model, and they are not intended to limit the protection scope of the present utility model. Any equivalent embodiments or changes made without departing from the technical spirit of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotor structure of a low-voltage permanent magnet synchronous motor with a small center height, characterized in that It includes a rotating shaft, a rotor core sleeved on the rotating shaft, magnetic steel assembled on the rotor core, and magnetic steel baffles located at both ends of the rotor core; wherein, the magnetic steel baffle is provided with a groove for placing a balance weight and a fastener for fastening the balance weight in the groove; the groove includes a groove bottom and a groove opening, and the width of the groove bottom is greater than the width of the groove opening.

2. The rotor structure of the low-voltage and small center height permanent magnet synchronous motor according to claim 1, characterized in that The groove is an annular groove, and the cross section of the groove is trapezoidal.

3. The rotor structure of the low-voltage and small center height permanent magnet synchronous motor according to claim 2, wherein A fastening hole matching with the fastener is arranged in the groove.

4. The rotor structure of the low-voltage and small center height permanent magnet synchronous motor according to claim 3, characterized in that, The aperture of the fastening hole is greater than the width of the groove bottom of the groove.

5. The rotor structure of the low-voltage and small center height permanent magnet synchronous motor according to claim 3, wherein There are two fastening holes, and the two fastening holes are distributed in the annular groove with a difference of 180 degrees.

6. The rotor structure of the low-voltage and small center-height permanent magnet synchronous motor according to claim 3, characterized in that, The fastener is a fastening screw.

7. The rotor structure of the low-voltage and small center height permanent magnet synchronous motor according to claim 1, wherein, The magnetic steel baffle further includes four uniformly distributed holding holes, a holding screw and a washer for fixing the magnetic steel baffle to the rotor core.

8. The rotor structure of the low-voltage and small center height permanent magnet synchronous motor according to claim 7, wherein, The magnetic steel baffle further includes a shaft hole matching with the rotating shaft, the four holding holes are distributed in a circumferential manner, and the groove is arranged between the shaft hole and the holding holes.

9. The rotor structure of the low-voltage and small center height permanent magnet synchronous motor according to claim 1, characterized in that, The depth of the groove is less than 1 / 4 of the thickness of the magnetic steel baffle and greater than 1 / 7 of the thickness of the magnetic steel baffle.

10. The rotor structure of the low-voltage and small center height permanent magnet synchronous motor according to claim 1, wherein The groove further includes inclined side walls on both sides, and the inclination angle ranges from 75° to 85°.

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