Optimized motor with harmonic attenuation structure

Abstract

This enables the creation of an optimized motor with a harmonic attenuation structure. [Solution] The motor includes a stator core and a rotor core, with a non-lead wire bobbin fixedly connected to the bottom end on one axial side of the stator core, removable insulating paper attached to the radially inner side of the non-lead wire bobbin, removable stator windings attached to the radially inner side of the non-lead wire bobbin, and a lead wire bracket fixedly attached to the other axial end of the stator core, with the stator core as part of the magnetic circuit and the stator windings arranged, and the core material is laminated using silicon steel plates of different thicknesses as needed to reduce eddy currents and hysteresis losses due to alternating magnetomotive force in the core, each silicon steel plate is connected at self-locking points, holes are drilled on both sides to accommodate the bobbin mounting, and the lead wire bracket is located at the top of the stator, supporting the copper coil and insulating protective components.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to an optimized motor with a harmonic attenuation structure.

Background Art

[0002] Due to factors such as the cogging effect of a permanent magnet synchronous motor, the saturation effect of the magnetic circuit, and the distribution form of windings, the air-gap magnetic field is distorted, resulting in distortion of the back electromotive force waveform of the permanent magnet synchronous motor, loss of the original sine component. Such distortion causes a large amount of spatial harmonics in the three-phase current of the motor. Since there are many current harmonic components in the frequency conversion drive system of the permanent magnet synchronous motor, the torque of the motor pulsates, greatly affecting the stability of motor operation. The torque pulsation of the motor can also cause vibration and noise. In more serious cases, it may resonate the PMSM frequency conversion system, offset the magnetic steel of the motor, and damage the rotating shaft of the motor. At the same time, additional losses occur in the motor core and windings due to the action of harmonic currents. These losses act on the motor itself as a heat source, increasing its temperature, affecting the internal materials and electromagnetic performance parameters of the motor, reducing its efficiency, and thus reducing its control performance. When the temperature further rises to the temperature rise limit value of its materials and the motor, the motor is damaged, and the performance of the motor is greatly reduced due to the action of harmonic currents, affecting the stability of the frequency conversion speed regulation system of the permanent magnet synchronous motor. There are mainly two factors that generate current harmonics. One is the time harmonics introduced by non-linear factors such as the dead zone effect of the inverter circuit or the diode voltage drop, and the other is the spatial harmonics introduced by the distortion of the air-gap magnetic field due to the design of the motor body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] The object of the present invention is to provide an optimized motor equipped with a harmonic attenuation structure. [Means for solving the problem]

[0005] To solve the above technical problems, the present invention provides the following technical solutions: an optimized motor with a harmonic attenuation structure, the motor comprising a stator core and a rotor core, wherein a non-lead wire bobbin is fixedly connected to the bottom end of one axial side of the stator core, insulating paper is removably attached to the radially inner side of the non-lead wire bobbin, stator windings are removably attached to the radially inner side of the non-lead wire bobbin, a lead wire bracket is fixedly attached to the other axial end of the stator core, a junction box is fixedly attached to the other axial end of the lead wire bracket, a terminal is removably attached to the other axial end of the junction box, a gasket is fixedly connected to the other axial side of the terminal, and a lead wire is fixedly connected to the other axial end of the terminal.

[0006] Preferably, the positions of the insulating paper and the stator windings correspond one-to-one, the connection between the insulating paper and the stator windings is a covered connection, the connection between the stator core and the insulating paper is a movable lock, and the connection between the stator core and the stator windings is a movable lock.

[0007] Preferably, a first rotor end plate is fixedly attached to the bottom end on one axial side of the rotor core, a first neodymium-iron-boron permanent magnet is removably attached to the radially inward side of the rotor core, a second rotor end plate is fixedly attached to the tip surface on the other axial side of the rotor core, and a rivet is fixedly attached to the radially inward side of the rotor core.

[0008] Preferably, the structure of the first rotor end plate and the second rotor end plate are the same, the connection relationship between the first rotor end plate and the rivet is a movable lock, and the connection relationship between the second rotor end plate and the rivet is a movable lock.

[0009] Preferably, the rotor core includes an inner diameter rotor, a magnetic pole sorting groove is provided on the surface of the inner diameter rotor on the other axial side, an unequal air gap auxiliary groove is provided on the radially outer surface of the inner diameter rotor along the circumferential direction, an inner diameter stator is movably mounted on the radially outer surface of the inner diameter rotor along the circumferential direction, the inner diameter stator includes a stator groove bottom, a second neodymium iron boron permanent magnet is fixedly mounted on the radially inner side of the inner diameter rotor, a permanent magnet notch is provided on the tip surface of the second neodymium iron boron permanent magnet on the other axial side, and an air passage weight reduction hole is provided on the surface of the inner diameter rotor on the other axial side.

[0010] Preferably, there are multiple unequal air gap auxiliary grooves, which are distributed circumferentially on the radially outer surface of the inner diameter rotor, the connection between the inner diameter rotor and the inner diameter stator is a movable fitting, and both the air passage weight reduction holes and the magnetic pole sorting grooves penetrate the other axial surface of the inner diameter rotor. [Effects of the Invention]

[0011] Compared with related technologies, the optimized motor with the harmonic attenuation structure provided by the present invention has the following beneficial effects.

[0012] 1. The present invention provides an optimized motor with a harmonic attenuation structure, in which the stator core is installed as part of the motor's magnetic circuit and the stator windings are arranged to reduce eddy currents and hysteresis losses due to alternating magnetomotive force in the core. The core material is laminated using silicon steel sheets of different thicknesses as needed, each silicon steel sheet is connected at self-locking points, holes are drilled on both sides to accommodate bobbin mounting, the lead wire side bracket is located at the top of the stator and is integrally molded by injection molding of PBT resin material, connected to the core via bottom locking points, and branching points are designed to facilitate the lead wire pulling process of the stator windings. The external wiring grooves allow for simultaneous adaptation to multiple winding programs. After assembly with the junction box, insulating isolation is formed to increase the creepage distance of the product. The insulating paper serves as one of the insulating components between the motor windings and the core, ensuring that the motor has sufficient insulating strength and distance. After the internal mechanism is installed, insulating impregnation varnish is used to insulate the external conductive medium from the connection terminals and binding post bearing unit of the junction box, improving the insulation performance of the connection points. After assembly with the insulating paper component, insulating isolation is formed to increase the creepage distance of the product. The gasket is injection molded from HNBR rubber, and after assembly with the junction box component, it forms a sealed cavity, ensuring that the component terminals are isolated and do not come into contact with the motor coolant, thus guaranteeing an insulating effect.

[0013] 2. The present invention provides an optimized motor with a harmonic attenuation structure, in which the rotor core is installed as part of the motor's magnetic circuit and the rotor electromagnetic block is positioned to reduce eddy currents and hysteresis losses due to alternating magnetomotive force in the core. The core material is laminated using silicon steel sheets of different thicknesses as needed, each silicon steel sheet is connected at self-locking points, holes are drilled in between to reduce weight / ventilate and facilitate cooling, and each component of the rotor is connected with rivets. The rivets serve to reinforce the rotor after riveting, preventing warping of the rotor core and simultaneously preventing the rotor electromagnetic block from flying off during operation. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram of the three-dimensional structure of the present invention. [Figure 2] This is a schematic diagram of the exploded structure of the rotor of the present invention. [Figure 3] This is a schematic diagram of the front structure of the stator core of the present invention. [Figure 4] This is an enlarged schematic diagram of the structure of location A in Figure 3 of the present invention. [Modes for carrying out the invention]

[0015] Example 1: Referring to Figures 1 to 4, the present invention provides the following technical solutions. An optimized motor with a harmonic attenuation structure, comprising a stator core 1 and a rotor core 11, wherein a non-lead wire side bobbin 2 is fixedly connected to the bottom end of one axial side of the stator core 1, insulating paper 3 is removably attached to the radially inner side of the non-lead wire side bobbin 2, stator windings 4 are removably attached to the radially inner side of the non-lead wire side bobbin 2, a lead wire side bracket 5 is fixedly attached to the other axial end of the stator core 1, a junction box 6 is fixedly attached to the other axial end of the lead wire side bracket 5, a terminal 7 is removably attached to the other axial end of the junction box 6, a gasket 8 is fixedly connected to the other axial side of the terminal 7, and a lead wire 9 is fixedly connected to the other axial end of the terminal 7, the positions of the insulating paper 3 and the stator windings 4 correspond one-to-one, the connection relationship between the insulating paper 3 and the stator windings 4 is a covered connection, the connection relationship between the stator core 1 and the insulating paper 3 is a movable lock, and the connection relationship between the stator core 1 and the stator windings 4 is a movable lock.

[0016] In this embodiment, the stator core 1 is installed as part of the motor's magnetic circuit, and the stator windings are arranged to reduce eddy currents and hysteresis losses due to alternating magnetomotive force in the core. The core material is laminated using silicon steel sheets of different thicknesses as needed, with each silicon steel sheet connected at self-locking points, and holes drilled on both sides to accommodate bobbin mounting. The lead wire side bracket 5 is located at the top of the stator, forming a single unit by injection molding of PBT resin material, and is connected to the core via a bottom locking point. Branching points are designed to facilitate the lead wire pulling process of the stator windings. The external wiring grooves allow for simultaneous adaptation to multiple winding programs. After assembly with the junction box 6, insulating isolation is formed to increase the creepage distance of the product. The insulating paper 3 serves as one of the insulating components between the motor windings and the core, ensuring that the motor has sufficient insulating strength and distance. After the internal mechanism is installed, insulating impregnation varnish is used to insulate the external conductive medium from the connection terminals and binding post bearing unit of the junction box 6, improving the insulation performance of the connection points. After assembly with the insulating paper 3, insulating isolation is formed to increase the creepage distance of the product. The gasket 8 is injection molded from HNBR rubber. After assembly with the junction box 6, it forms a sealed cavity, ensuring that the component terminals 7 are isolated and do not come into contact with the motor coolant, thus guaranteeing an insulating effect.

[0017] Example 2: Referring to Figures 1 to 4, the present invention provides the following technical solution: An optimized motor with a harmonic attenuation structure, wherein a first rotor end plate 10 is fixedly attached to the bottom end of one axial side of the rotor core 11, a first neodymium iron boron permanent magnet 12 is removably attached to the radially inner side of the rotor core 11, a second rotor end plate 13 is fixedly attached to the tip surface of the other axial side of the rotor core 11, a rivet 14 is fixedly attached to the radially inner side of the rotor core 11, the structure of the first rotor end plate 10 and the second rotor end plate 13 is the same, the connection relationship between the first rotor end plate 10 and the rivet 14 is movable locking, the connection relationship between the second rotor end plate 13 and the rivet 14 is movable locking, the rotor core 11 includes an inner diameter rotor 15, a magnetic pole sorting groove 16 is provided on the axially opposite surface of the inner diameter rotor 15, and along the circumferential direction on the radially outer surface of the inner diameter rotor 15 Unequal air gap auxiliary grooves 17 are provided, an inner diameter stator 18 is movably mounted along the circumferential direction on the radially outer surface of the inner diameter rotor 15, the inner diameter stator 18 includes a stator groove bottom 19, a second neodymium iron boron permanent magnet 20 is fixedly mounted radially inward of the inner diameter rotor 15, a permanent magnet notch 21 is provided on the tip surface on the other axial side of the second neodymium iron boron permanent magnet 20, an air passage weight reduction hole 22 is provided on the other axial side of the inner diameter rotor 15, there are multiple unequal air gap auxiliary grooves 17, the multiple unequal air gap auxiliary grooves 17 are distributed circumferentially on the radially outer surface of the inner diameter rotor 15, the connection relationship between the inner diameter rotor 15 and the inner diameter stator 18 is a movable fit, and both the air passage weight reduction hole 22 and the magnetic pole sorting groove 16 penetrate the other axial side surface of the inner diameter rotor 15.

[0018] In the embodiment, the rotor core 11 is installed as part of the motor's magnetic circuit, and by arranging the rotor electromagnetic block, in order to reduce the eddy current and hysteresis losses caused by the alternating magnetomotive force in the core, the core material is laminated using silicon steel sheets of different thicknesses as required. Each silicon steel sheet is connected at the self-locking point, with holes opened in the middle for weight reduction / ventilation to facilitate cooling. Each component of the rotor is connected by a rivet 14, and after the rivet 14 is riveted, it plays a role in reinforcement, preventing the warping of the rotor core and at the same time preventing the rotor electromagnetic block from popping out during operation.

[0019] Operating principle: The stator core 1 is installed as part of the motor's magnetic circuit, and by arranging the stator winding, in order to reduce the eddy current and hysteresis losses caused by the alternating magnetomotive force in the core, the core material is laminated using silicon steel sheets of different thicknesses as required. Each silicon steel sheet is connected at the self-locking point, with holes opened on both sides according to the attachment of the bobbin. The lead wire side bracket 5 is located at the copper coil support and insulation protection parts at the top of the stator, injection molded with a PBT resin material and integrally formed, and connected to the core through the bottom locking point. A branch point is designed to facilitate the process of drawing out the lead wires of the stator winding. A wiring groove is arranged on the outside, which can be simultaneously adapted to multiple types of winding programs. After assembling with the connection box 6, an insulation isolation can be formed to increase the creepage distance of the product. The insulation paper 3, as one of the insulation structures between the motor winding and the core, ensures that the motor has sufficient insulation strength and insulation distance. The connection terminals and binding post bearing units of the connection box 6 are insulated from external conductive media using an insulation impregnating varnish after installing the internal mechanism, improving the insulation performance of the connection site. After assembling with the component insulation paper 3, an insulation isolation can be formed to increase the creepage distance of the product. The gasket 8 is injection molded with HNBR rubber, and after assembling with the component connection box 6, a sealed cavity is formed to ensure that the component terminal 7 is isolated alone and does not contact the motor coolant, guaranteeing the insulation effect.

[0020] The rotor core 11 is installed as part of the magnetic circuit of the motor. By arranging the rotor electromagnetic block, in order to reduce the eddy current and hysteresis losses caused by the alternating magnetomotive force in the core, the core material is laminated using silicon steel sheets of different thicknesses as required. Each silicon steel sheet is connected at the self-locking point, with holes opened in the middle for weight reduction / ventilation to facilitate cooling. Each component of the rotor is connected by rivets 14. After the rivets 14 are riveted, they play a role in strengthening, preventing the warping of the rotor core, and at the same time preventing the rotor electromagnetic block from popping out during operation.

[0021] The magnetic pole shaping groove 16 is a main component of the "rotor deformation" of this application, which optimizes the rotor magnetic circuit. The unequal air gap auxiliary groove 17 is symmetrically distributed in two on the radially outer side of the permanent magnet notch 21 part of each pole and is composed of three-stage arc cutting parts. It cooperates with the magnetic pole shaping groove 16 and the stator inner diameter 18 to form an unequal air gap, which is a main component of the "deformed air gap" of this application. The stator inner diameter 18 is configured as non-full circle. The optimal solution is obtained through CAE simulation topology analysis, connecting two sets of line segments to form a shape similar to the Chinese character "ren". The stator groove bottom 19 adopts the second neodymium iron boron permanent magnet 20 with a flat bottom groove structure. In this application, the permanent magnet notch 21 of the magnetic steel is arranged in a V shape. When assembling the components, air passage weight reduction holes are provided in advance, and the flow passage of the motor coolant is provided in advance, which also plays a role in weight reduction at the same time. Considering the structural strength problem of the high-speed rotation of the rotor, the holes are disassembled into the existing shape through structural design topology analysis.

Description of symbols

[0022] 1 Stator core 2 Non-lead wire side bobbin 3 Insulating paper 4 Stator winding 5 Lead wire side bracket 6 Connection box 7 Terminal 8 Gasket 9 Lead wire 10 First rotor end plate 11 Rotor core 12. First Neodymium Iron Boron Permanent Magnet 13. Second rotor end plate 14 rivets 15 Inner diameter rotor 16 Magnetic pole arrangement groove 17 Unequal air gap auxiliary groove 18 Inner diameter stator 19 Stator groove bottom 20. Second Neodymium Iron Boron Permanent Magnet 21 Permanent Magnet Notch 22 Lightweight air passage holes

Claims

1. An optimized motor equipped with a harmonic attenuation structure, wherein the motor includes a stator core (1) and a rotor core (11), a non-lead wire side bobbin (2) is fixedly connected to the bottom end of one axial side of the stator core (1), insulating paper (3) is removably attached to the radially inner side of the non-lead wire side bobbin (2), a stator winding (4) is removably attached to the radially inner side of the non-lead wire side bobbin (2), a lead wire side bracket (5) is fixedly attached to the other axial end of the stator core (1), a junction box (6) is fixedly attached to the other axial end of the lead wire side bracket (5), a terminal (7) is removably attached to the other axial end of the junction box (6), a gasket (8) is fixedly connected to the radially inner side of the terminal (7), and a lead wire (9) is fixedly connected to the other axial end of the terminal (7).

2. An optimized motor with a harmonic attenuation structure according to claim 1, characterized in that the positions of the insulating paper (3) and the stator winding (4) correspond one-to-one, the connection between the insulating paper (3) and the stator winding (4) is a covered connection, the connection between the stator core (1) and the insulating paper (3) is a movable lock, and the connection between the stator core (1) and the stator winding (4) is a movable lock.

3. An optimized motor with a harmonic attenuation structure according to claim 1, characterized in that a first rotor end plate (10) is fixedly attached to the bottom end on one axial side of the rotor core (11), a first neodymium iron boron permanent magnet (12) is removably attached to the radially inward side of the rotor core (11), a second rotor end plate (13) is fixedly attached to the tip surface on the other axial side of the rotor core (11), and a rivet (14) is fixedly attached to the radially inward side of the rotor core (11).

4. An optimized motor with a harmonic attenuation structure according to claim 3, characterized in that the structure of the first rotor end plate (10) and the second rotor end plate (13) are the same, the connection relationship between the first rotor end plate (10) and the rivet (14) is a movable lock, and the connection relationship between the second rotor end plate (13) and the rivet (14) is a movable lock.

5. An optimized motor with a harmonic attenuation structure according to claim 1, characterized in that the rotor core (11) includes an inner diameter rotor (15), a magnetic pole sorting groove (16) is provided on the surface of the inner diameter rotor (15) on the other axial side, an unequal air gap auxiliary groove (17) is provided on the radially outer surface of the inner diameter rotor (15) along the circumferential direction, an inner diameter stator (18) is movably mounted on the radially outer surface of the inner diameter rotor (15) along the circumferential direction, the inner diameter stator (18) includes a stator groove bottom (19), a second neodymium iron boron permanent magnet (20) is fixedly mounted on the radially inner side of the inner diameter rotor (15), a permanent magnet notch (21) is provided on the tip surface of the second neodymium iron boron permanent magnet (20) on the other axial side, and an air passage weight reduction hole (22) is provided on the surface of the inner diameter rotor (15) on the other axial side.

6. The optimized motor with a harmonic attenuation structure according to claim 5, characterized in that there are multiple unequal air gap auxiliary grooves (17), the multiple unequal air gap auxiliary grooves (17) are distributed circumferentially on the outer surface of the inner diameter rotor (15), the connection relationship between the inner diameter rotor (15) and the inner diameter stator (18) is a movable fitting, and both the air passage weight reduction holes (22) and the magnetic pole sorting grooves (16) penetrate the other axial surface of the inner diameter rotor (15).

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