Variable frequency driving permanent magnet synchronous motor

Abstract

The utility model discloses a variable frequency driving permanent magnet synchronous motor, which comprises a front end cover, a base, a rear end cover, a stator core with a winding and a rotor, the front end cover and the rear end cover are mounted at two ends of the base; the stator core with the winding is pressed and fixed on the inner wall of the base through interference fit; the rotor comprises a rotor iron core, magnetic steel, a rotor shaft, a stainless steel pressing plate, a magnetic steel partition plate and a bearing; the rotor shaft and the rotor core are in interference fit and are pressed and fixed, the magnetic steel is attached to and installed on a clamping groove in the outer edge of the rotor core, a magnetic steel partition plate is arranged in the middle of the rotor core, the longitudinal adjacent magnetic steel is partitioned by a rotor core T-shaped table, and a rotor core T-shaped table groove used for air partition is formed in the rotor core T-shaped table. And a plurality of arc-shaped grooves are formed in the rotor core. According to the utility model, the motor structure, especially the rotor structure, is optimally designed, the electromagnetic performance of the motor is improved, and the heat dissipation performance is enhanced, so that the application of the variable-frequency driving permanent magnet motor in the aspects of high efficiency, energy conservation and emission reduction is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of fan motors, and particularly relates to a variable-frequency drive permanent magnet synchronous motor. Background Art

[0002] In response to the call of the national "energy conservation and emission reduction" policy and according to the market demand for motor energy efficiency, various permanent magnet synchronous motors have emerged in the fan industry. With the advantages of high efficiency, adjustable speed, multiple protections and intelligent control, permanent magnet synchronous motors are widely used in industrial and civil fields, achieving the goals of environmental protection, energy conservation and emission reduction.

[0003] However, at present, most of the permanent magnet synchronous motors on the market have deficiencies such as low efficiency, easy loosening of surface-mounted permanent magnets, and high motor temperature rise, which are not conducive to the popularization and application of permanent magnet synchronous motors. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a variable-frequency drive permanent magnet synchronous motor, which aims to realize the application of variable-frequency drive permanent magnet motors in high efficiency, energy conservation and emission reduction by optimizing the structural design (the key lies in optimizing the rotor structure), improving the electromagnetic performance and enhancing the heat dissipation performance.

[0005] To achieve the above purpose, the utility model provides a variable-frequency drive permanent magnet synchronous motor, including: a front end cover, a machine base, a rear end cover, a wound stator core and a rotor;

[0006] The front end cover and the rear end cover are installed at both ends of the machine base, and the wound stator core is press-fitted and fixed on the inner wall of the machine base through interference fit;

[0007] The rotor includes a rotor core, a permanent magnet, a rotor shaft, a stainless steel pressing plate, a permanent magnet partition and a bearing;

[0008] The rotor shaft is press-fitted and fixed with the rotor core through interference fit. The permanent magnet is fitted and installed on the outer edge slot of the rotor core. A permanent magnet partition is arranged in the middle of the rotor core to horizontally partition two adjacent permanent magnets. Each longitudinally adjacent permanent magnet is partitioned by a T-shaped table of the rotor core. A T-shaped table groove of the rotor core for air partition is arranged on the T-shaped table of the rotor core. A plurality of arc-shaped grooves are arranged inside the rotor core. Pressing plates are arranged at both ends of the rotor core. The pressing plates and the rotor core are press-fitted and fixed through the flanging on the pressing plates and the round holes of the rotor core. The permanent magnet is fixed in the slot of the rotor core through the pressing plate. The rotor shaft is installed and fixed with the front end cover and the rear end cover through the bearing.

[0009] A further technical solution of the utility model is that the permanent magnet partition and the rotor punching are stamped and self-locked together.

[0010] A further technical solution of the present utility model is that the wound stator core includes a stator core, a winding insulation frame, slot paper, and a winding. The slot paper is sleeved into the groove of the stator core. The winding insulation frame is respectively fixed to the upper and lower end faces of the stator core through fixing columns. The winding insulation frame is provided with a first-level step that matches the length of the slot paper, and limit fixing installations are formed at both ends.

[0011] A further technical solution of the present utility model is that it further includes an electric appliance box with a driving board, and the electric appliance box with a driving board is installed and fixed directly above the machine base.

[0012] A further technical solution of the present utility model is that the electric appliance box with a driving board includes an electric appliance box cover, a driving board, and an electric appliance box bottom plate. Two bosses are provided at both ends of the electric appliance box bottom plate. The electric appliance box with a driving board is connected to the machine base through the two bosses. A sealed groove for placing a sealing rubber ring is provided at the edge of the electric appliance box with a driving board.

[0013] A further technical solution of the present utility model is that a plurality of heat dissipation ribs are provided on the electric appliance box bottom plate, and the direction of the heat dissipation ribs is consistent with the axial direction.

[0014] A further technical solution of the present utility model is that a plurality of L-shaped heat dissipation ribs are provided on the top of the electric appliance box cover, and the plurality of L-shaped heat dissipation ribs form a wind groove consistent with the wind direction.

[0015] A further technical solution of the present utility model is that a plurality of protrusions are provided on the inner bottom surface of the electric appliance box cover, and the end surfaces of the protrusions are fitted and installed with the power components of the driving board, which is beneficial to the heat dissipation of the driving board.

[0016] A further technical solution of the present utility model is that the front end cover and the rear end cover are formed by a combination of multiple layers of bosses, and arc surfaces and a plurality of reinforcing ribs are used for transitional connection between the layers of bosses.

[0017] A further technical solution of the present utility model is that the oil seal groove of the shaft hole of the front end cover adopts an inverted cone design and fits with the inner end surface of the rubber oil seal.

[0018] The beneficial effects of the variable-frequency drive permanent magnet synchronous motor of the present utility model are as follows:

[0019] Through the above solutions, the present utility model optimizes the design of the motor structure, especially the rotor structure, improves the electromagnetic performance of the motor and enhances the heat dissipation performance, thereby realizing the application of the variable-frequency drive permanent magnet motor in high efficiency, energy conservation and emission reduction. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the variable-frequency drive permanent magnet synchronous motor of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the wound stator core;

[0023] Figure 3 It is a schematic diagram of the structure of the rotor;

[0024] Figure 4 It is a schematic diagram of the structure of the rotor core;

[0025] Figure 5 It is a schematic diagram of the internal structure of the electrical box;

[0026] Figure 6 It is a schematic diagram of the structure of the bottom plate of the electrical box;

[0027] Figure 7 It is a schematic diagram of the structure of the front end cover.

[0028] Explanation of the reference numerals in the drawings:

[0029] Front end cover 1: Oil seal groove 11;

[0030] Frame 2;

[0031] Rear end cover 3;

[0032] Wound stator core 4: Stator core 41; Winding insulation frame 42; Slot paper 43;

[0033] Rotor 5: Rotor shaft 51; Rotor core 52; Permanent magnet 53; Bearing 54; Pressing plate 55; T-shaped platform 521 of the rotor core; T-shaped platform groove 522 of the rotor core; Arc groove 523; Permanent magnet partition 524;

[0034] Electrical box 6 with drive board: Electrical box cover 61; Drive board 62; Bottom plate 63 of the electrical box; Boss 631; Sealing groove 632; Heat dissipation rib 633.

[0035] The realization of the purpose, functional features and advantages of the present invention will be further described with reference to the embodiments and the drawings. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figures 1 to 7 , the present invention provides a variable-frequency drive permanent magnet synchronous motor. The preferred embodiment of the variable-frequency drive permanent magnet synchronous motor of the present invention includes: a front end cover 1, a machine base 2, a rear end cover 3, a wound stator core 4, and a rotor 5.

[0038] The front end cover 1 and the rear end cover 3 are installed at both ends of the machine base 2 through tooth engagement, and the wound stator core 4 is press-fitted and fixed on the inner wall of the machine base 2 by interference fit.

[0039] The rotor 5 includes a rotor core 52, a permanent magnet 53, a rotor shaft 51, a stainless steel pressing plate 55, a permanent magnet partition 524, and a bearing 54.

[0040] The rotor shaft 51 is press-fitted and fixed with the rotor core 52 by interference fit. The permanent magnet 53 is fitted on the outer edge slot of the rotor core 52. The permanent magnet partition 524 is arranged in the middle of the rotor core 52 for horizontally separating two adjacent permanent magnets 53, and each longitudinally adjacent permanent magnet 53 is separated by the T-shaped table 521 of the rotor core.

[0041] Specifically, in this embodiment, the height of the permanent magnet partition 524 can be set to 1 mm. The permanent magnet partition 524 and the rotor 5 punching are stamped and self-locked together, so that there is an air partition after the upper and lower permanent magnets 53 are installed, reducing the magnetic leakage phenomenon between the two permanent magnets 53 and effectively improving the motor performance.

[0042] In this embodiment, the tooth part of the rotor core 52 is T-shaped, which is matched with the edge shape of the permanent magnet 53. The inner circle of the permanent magnet 53 is fitted with the bottom of the slot of the rotor core 52, and the two sides of the permanent magnet 53 are matched with the side surfaces of the slot of the rotor core 52, so that the permanent magnet 53 is fixed in the slot of the rotor core 52 through the T-shaped angle, and after installation, it has the advantages of both embedded and surface-mounted permanent magnets 53.

[0043] A rotor core T-shaped table groove 522 for air partition is arranged on the rotor core T-shaped table 521, and the air partition in the rotor core T-shaped table groove 522 is used to reduce the magnetic leakage phenomenon between adjacent magnetic poles and effectively improve the motor performance.

[0044] A number of arc-shaped grooves 523 are provided inside the rotor core 52, which is beneficial for the magnetic flux between the magnetic poles to flow along the designed magnetic path, forming a stronger magnetic force and thus improving the performance of the motor.

[0045] Stainless steel pressing plates 55 are provided at both ends of the rotor core 52. The pressing plates 55 and the rotor core 52 are fixed by pressing the flanges on the pressing plates 55 with the round holes of the rotor core 52. The magnetic steel 53 is fixed in the card slots of the rotor core 52 through the pressing plates 55. The rotor shaft 51 is installed and fixed in cooperation with the front end cover 1 and the rear end cover 3 through the bearings 54.

[0046] In this embodiment, the wound stator core 4 includes a stator core 41, a winding insulation frame 42, slot paper 43 and windings. The slot paper 43 is sleeved into the grooves of the stator core 41. The winding insulation frame 42 is fixed on the upper and lower end faces of the stator core 41 through fixing columns respectively. The winding insulation frame 42 is provided with a first-level step that matches the length of the slot paper 43, and limit fixing installations are formed at both ends to prevent the slot paper 43 from loosening and affecting the electrical strength of the windings.

[0047] In this embodiment, the front end cover 1 and the rear end cover 3 are formed by a combination of multiple layers of convex platforms, and arc surfaces and a number of reinforcing ribs are used for transitional connection between the convex platforms of each layer.

[0048] The shaft hole oil seal groove 11 of the front end cover 1 adopts an inverted cone design and fits with the inner end face of the rubber oil seal, which can effectively improve the sealing effect.

[0049] Furthermore, in this embodiment, the variable frequency drive permanent magnet synchronous motor further includes a drive board electrical box 6, and the drive board electrical box 6 is fixedly installed directly above the machine base 2.

[0050] Among them, the drive board electrical box 6 includes an electrical box cover 61, a drive board 62 and an electrical box bottom plate 63. Two convex platforms 631 are provided at both ends of the electrical box bottom plate 63. The drive board electrical box 6 is connected to the machine base 2 through the two convex platforms 631, thereby reducing the contact area between the drive board electrical box 6 and the motor body, and further reducing the heat transfer between the two.

[0051] A number of heat dissipation ribs 633 are provided on the electrical box bottom plate 63, and the direction of the heat dissipation ribs 633 is consistent with the axial direction, which is beneficial for the ventilation and heat dissipation of the electrical box.

[0052] A sealed groove 632 for placing a sealing rubber ring is provided at the edge of the drive board electrical box 6, thereby ensuring the sealing effect of the installation with the electrical box.

[0053] Several L-shaped heat dissipation ribs are provided on the top of the electrical box cover 61, and the several L-shaped heat dissipation ribs form a wind groove consistent with the wind direction, which is beneficial to improving the heat dissipation effect of the electrical box.

[0054] Several protrusions are provided on the inner bottom surface of the electrical box cover 61, and the end surfaces of the protrusions are attached to the power components of the driving board 62, which is beneficial to the heat dissipation effect of the power components of the driving board 62 and improves the stability of the driving board 62.

[0055] The beneficial effects of the variable-frequency drive permanent magnet synchronous motor of the present invention are:

[0056] Through the above solution, the present invention optimizes the design of the motor structure, especially the rotor structure, improves the electromagnetic performance of the motor and enhances the heat dissipation performance, thereby realizing the application of the variable-frequency drive permanent magnet motor in high efficiency, energy conservation and emission reduction.

[0057] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A variable-frequency drive permanent magnet synchronous motor, characterized in that, Comprising: A front end cover, a frame, a rear end cover, a stator core with windings, and a rotor; The front end cover and the rear end cover are installed at both ends of the frame, and the stator core with windings is press-fitted and fixed on the inner wall of the frame by interference fit; The rotor includes a rotor core, a permanent magnet, a rotor shaft, a stainless steel pressing plate, a permanent magnet separator, and a bearing; The rotor shaft is press-fitted and fixed with the rotor core by interference fit. The permanent magnet is fitted and installed on the outer edge slot of the rotor core. A permanent magnet separator is arranged in the middle of the rotor core to transversely partition two adjacent permanent magnets. Each longitudinally adjacent permanent magnet is partitioned by a T-shaped platform of the rotor core. A T-shaped platform groove for air isolation is arranged on the T-shaped platform of the rotor core. A plurality of arc-shaped grooves are arranged inside the rotor core. Pressing plates are arranged at both ends of the rotor core. The pressing plates and the rotor core are press-fitted and fixed through the turning platforms on the pressing plates and the round holes of the rotor core. The permanent magnet is fixed in the slot of the rotor core through the pressing plate. The rotor shaft is installed and fixed in cooperation with the front end cover and the rear end cover through the bearing.

2. The variable-frequency drive permanent magnet synchronous motor according to claim 1, wherein The permanent magnet separator and the rotor punching are stamped and self-locked together.

3. The variable-frequency drive permanent magnet synchronous motor according to claim 1, characterized in that The stator core with windings includes a stator core, a winding insulation frame, slot paper, and windings. The slot paper is sleeved into the groove of the stator core. The winding insulation frame is fixed on the upper and lower end faces of the stator core through fixing columns respectively. The winding insulation frame is provided with a first-level step that matches the length of the slot paper, and limit fixing installations are formed at both ends.

4. The variable-frequency drive permanent magnet synchronous motor according to claim 1, wherein It further includes an electric appliance box with a driving board, and the electric appliance box with a driving board is installed and fixed directly above the frame.

5. The variable-frequency drive permanent magnet synchronous motor according to claim 4, wherein The electric appliance box with a driving board includes an electric appliance box cover, a driving board, and an electric appliance box bottom plate. Two bosses are arranged at both ends of the electric appliance box bottom plate. The electric appliance box with a driving board is connected to the frame through the two bosses. A sealing groove for placing a sealing rubber ring is arranged on the edge of the electric appliance box with a driving board.

6. The variable-frequency drive permanent magnet synchronous motor according to claim 5, characterized in that, A plurality of heat dissipation ribs are arranged on the electric appliance box bottom plate, and the direction of the heat dissipation ribs is consistent with the axial direction.

7. The variable-frequency drive permanent magnet synchronous motor according to claim 6, wherein A plurality of L-shaped heat dissipation ribs are arranged on the top of the electric appliance box cover, and the plurality of L-shaped heat dissipation ribs form a wind groove consistent with the wind direction.

8. The variable-frequency drive permanent magnet synchronous motor according to claim 7, wherein, A plurality of protrusions are arranged on the inner bottom surface of the electric appliance box cover, and the end faces of the protrusions are fitted and installed with the power components of the driving board, which is beneficial to the heat dissipation of the driving board.

9. The variable-frequency drive permanent magnet synchronous motor according to claim 1, wherein The front end cover and the rear end cover are composed of a multi-layer convex platform combination, and arc surfaces and a plurality of reinforcing ribs are used for transition connection between the convex platforms.

10. The variable-frequency drive permanent magnet synchronous motor according to claim 1, characterized in that, The oil seal groove of the shaft hole of the front end cover adopts an inverted cone design and fits with the inner end face of the rubber oil seal.

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