Axial excitation inductor flywheel rotor energy storage motor

Abstract

The invention belongs to the field of flywheel rotor energy storage, and particularly relates to an axial excitation inductor flywheel rotor energy storage motor which comprises a shell, an upper cover, an upper bearing seat, an upper rotating shaft, a flywheel rotor, a lower rotating shaft, a lower bearing seat, a lower cover, a first stator iron core, a second stator iron core, an excitation winding and an armature winding. The first stator iron core is annular and is fixed on the lower end surface of the upper cover; the excitation winding is arranged on the side wall of the first stator iron core; the second stator iron core corresponds to the first stator iron core in shape and is fixed on the lower end surface of the first stator iron core, a plurality of second notches penetrating through the side wall are formed in the bottom of the second stator iron core, and the armature windings are arranged in the second notches; the flywheel rotor is arranged in the shell. The motor has the characteristic of large heat dissipation space, can suspend the flywheel rotor, and avoids magnetic circuit coupling of the permanent magnet and the excitation winding. The radius of the flywheel rotor can be set to be larger, the energy storage capacity of the motor is increased, the structure is simple, and the reliability is good.

Description

Technical Field

[0001] The invention belongs to the field of flywheel rotor energy storage, and in particular relates to an axial excitation induction flywheel rotor energy storage motor. Background Art

[0002] With the global population growth and the acceleration of industrialization, energy demand continues to grow. At the same time, environmental issues and dependence on fossil energy are increasingly attracting people's attention. These issues have promoted the research and development of clean and renewable energy technologies. Flywheel rotor energy storage technology, as an efficient and renewable energy storage and conversion method, has received increasing attention.

[0003] As a key component of flywheel rotor energy storage, flywheel rotor energy storage motor has always attracted much attention. With the current research, permanent magnet synchronous motor, induction motor, etc. have entered people's field of vision. Among them, induction motor has a simple structure, stable and reliable operation, and a long service life, which can provide long-lasting and reliable energy conversion services.

[0004] Although the integrated structure of the flywheel and rotor in the existing induction motor can improve the energy conversion efficiency, the flywheel rotor structure is too large, so it is necessary to add magnetic bearings to reduce the pressure on the mechanical bearings. The permanent magnets on the magnetic bearings are used to provide suspension force for the flywheel rotor. However, the permanent magnets are easily coupled with the excitation winding to produce magnetic circuits, resulting in fluctuations in the suspension force, which may damage the motor bearings and cause irreversible losses. Summary of the invention

[0005] The present invention provides an axially excited inductor flywheel rotor energy storage motor, which can effectively solve the problems in the background technology.

[0006] The present invention provides an axial excitation induction flywheel rotor energy storage motor, comprising a housing, an upper cover, an upper rotating shaft, a flywheel rotor, a lower rotating shaft, a lower cover, a first stator core, a second stator core, an excitation winding and an armature winding;

[0007] The shell is sleeve-shaped; the upper cover and the lower cover are respectively arranged on the upper and lower ends of the shell;

[0008] The first stator core is annular and fixed to the lower end surface of the upper cover, and the excitation winding is arranged on the side wall of the first stator core;

[0009] The second stator core has a shape corresponding to that of the first stator core and is fixed to the lower end surface of the first stator core. The bottom of the second stator core is provided with a plurality of second slots penetrating the side wall, and the armature winding is arranged in the second slots.

[0010] The flywheel rotor is arranged in the housing; the upper end of the upper rotating shaft is rotatably connected to the upper cover, and the lower end of the upper rotating shaft is fixed to the upper end surface of the flywheel rotor; the upper end of the lower rotating shaft is fixed to the lower end surface of the flywheel rotor, and the lower end of the lower rotating shaft is rotatably connected to the lower cover; the upper end surface of the flywheel rotor is provided with two fan-shaped annular grooves corresponding to the second stator core, and the two fan-shaped annular grooves are symmetrical to each other;

[0011] The shell, upper cover and flywheel rotor are made of ferromagnetic materials.

[0012] As a further optimization of the present invention, it also includes an upper bearing seat and a lower bearing seat; the upper bearing seat is fixed downward on the upper cover, and the lower bearing seat is fixed upward on the lower cover, and the upper bearing seat and the lower bearing seat are made of non-ferromagnetic materials; the upper end of the upper rotating shaft is inserted into the upper bearing seat, and the lower end of the lower rotating shaft is inserted into the lower bearing seat.

[0013] As a further optimization of the present invention, the lower end of the first stator core is provided with two first slots penetrating the side wall, and two groups of excitation windings are provided. Each group of excitation windings is wound on the two first slots and fits the inner and outer walls of the first stator iron ring to form a fan ring shape, and the two groups of excitation windings form a circular ring shape.

[0014] As a further optimization of the present invention, the armature windings are provided with several groups, each group of armature windings is wound on two of the second notches and fits on the inner and outer walls of the second stator iron ring to form a fan ring shape, and several groups of armature windings form a circular ring shape.

[0015] As a further optimization of the present invention, eighteen second slots are provided, a group of armature windings are wound around every five second slots, and two groups of armature windings are wound around each second slot.

[0016] As a further optimization of the present invention, the first stator core and the second stator core are both formed by stacking silicon steel sheets.

[0017] As a further optimization of the present invention, it also includes a magnetic conductive ring, which is fixed on the upper end surface of the lower cover; the lower cover is made of ferromagnetic material.

[0018] As a further optimization of the present invention, the flywheel rotor is cast by alloy.

[0019] The present invention provides an axially excited induction flywheel rotor energy storage motor, in which the armature winding and the excitation winding are both located above the flywheel rotor. The armature winding and the excitation winding are axially arranged. Compared with the traditional induction motor, the motor has the characteristic of large heat dissipation space, thereby improving the heat dissipation coefficient of the armature winding and the excitation winding, thereby reducing the temperature rise of other parts of the motor.

[0020] The excitation winding of the present invention is connected to the upper cover, and the excitation magnetic flux generated by the current can not only generate the excitation magnetomotive force, but also suspend the flywheel rotor. Compared with the traditional induction motor, no permanent magnet is needed to provide the suspension force, thus avoiding the magnetic circuit coupling between the permanent magnet and the excitation winding, and reducing the difficulty of the decoupling design. The present invention can also generate a stable suspension force by adjusting the current of the excitation winding.

[0021] The flywheel rotor and the stator core of the present invention are arranged in an upper and lower distribution, so that the radius of the flywheel rotor can be set larger under the same volume, thereby increasing the energy storage capacity of the motor, and the structure is simple and has good reliability.

[0022] Instruction Manual

[0023] Figure 1 is a schematic diagram of the cutaway structure of Example 1;

[0024] Figure 2 yes Figure 1 Schematic diagram of the flywheel rotor structure;

[0025] Figure 3 yes Figure 1 A schematic diagram of the structure of the first stator core and the second stator core;

[0026] Figure 4 yes Figure 3 Schematic diagram of the structure after adding the field winding and armature winding;

[0027] Figure 5 is a schematic diagram of the cutaway structure of Example 2;

[0028] Among them, the shell 1, the upper cover 2, the upper bearing seat 3, the upper shaft 4, the flywheel rotor 5, the fan-shaped groove 5a, the lower shaft 6, the lower bearing seat 7, the lower cover 8, the first stator core 9, the first slot 9a, the second stator core 10, the second slot 10a, the excitation winding 11, the armature winding 12, the magnetic ring 13, the excitation winding air gap magnetic path 14, and the newly added air gap magnetic path 15. DETAILED DESCRIPTION

[0029] Example 1

[0030] like Figure 1-5 As shown, this embodiment includes a housing 1, an upper cover 2, an upper bearing seat 3, an upper shaft 4, a flywheel rotor 5, a lower shaft 6, a lower bearing seat 7, a lower cover 8, a first stator core 9, a second stator core 10, an excitation winding 11 and an armature winding 12.

[0031] The housing 1 is sleeve-shaped, and the upper cover 2 and the lower cover 8 are respectively covered at the upper and lower ends of the housing 1. The upper bearing seat 3 is fixed at the center of the upper cover 2 with its opening facing downward, and the lower bearing seat 7 is fixed at the center of the lower cover 8 with its opening facing upward.

[0032] The flywheel rotor 5 is made of alloy casting and is integrally formed. The flywheel rotor 5 is arranged in the housing 1, and the lower end of the upper rotating shaft 4 is fixed to the upper end surface of the flywheel rotor 5, and the upper end of the upper rotating shaft 4 is inserted into the upper bearing seat 3. The upper end of the lower rotating shaft 6 is fixed to the lower end surface of the flywheel rotor 5, and the lower end of the lower rotating shaft 6 is inserted into the lower bearing seat 7. The axis lines of the upper rotating shaft 4 and the lower rotating shaft 6 are collinear. In other embodiments, the upper bearing seat 3 and the lower bearing seat 7 may not be provided, but the mounting grooves for mounting the bearings may be directly provided on the upper cover 2 and the lower cover 8, and the bearings may be fixed in the mounting grooves.

[0033] In this embodiment, the first stator core 9 is annular and fixed to the lower end surface of the upper cover 2, and the excitation winding 11 is arranged on the side wall of the first stator core 9. In this embodiment, two first notches 9a penetrating the side wall are arranged at the lower end of the first stator core 9, and two groups of excitation windings 11 are arranged, each group of excitation windings 11 passes through the two first notches 9a and is wound on the side wall of the first stator core 9, and the excitation winding 11 is attached to the inner and outer side walls of the first stator iron ring to form a fan ring shape, and the fan rings formed by the two groups of excitation windings 11 are assembled to form a circular ring.

[0034] The second stator core 10 is annular and corresponds to the shape of the first stator core 9. The second stator core 10 is fixed to the lower end surface of the first stator core 9. The lower end of the second stator core 10 is provided with a second notch 10a that penetrates the side wall. The second notches 10a are provided in a plurality and arranged in a circular array. The armature winding 12 is provided in the second notch 10a. Specifically, the armature winding 12 is provided in a plurality of groups. The armature winding 12 is wound on two of the second notches 10a. The armature winding 12 is attached to the inner and outer walls of the second stator core 10 to form a fan ring. The plurality of groups of excitation windings surround the inner and outer walls of the entire second stator core 10 to form a circular ring. Specifically, in this embodiment, eighteen second notches 10a are provided. One group of armature winding 12 is wound around every five second notches 10a. Two groups of armature winding 12 are wound around each second notch 10a.

[0035] In this embodiment, the upper bearing seat 3 and the lower bearing seat 7 are made of non-ferromagnetic materials, and the housing 1, the upper cover 2 and the flywheel rotor 5 are made of ferromagnetic materials. A first air gap is formed between the second stator core 10 and the flywheel rotor 5, and a second air gap is formed between the flywheel rotor 5 and the housing 1.

[0036] In this embodiment, two sector annular grooves 5a are also provided on the upper end surface of the flywheel rotor 5. The sector annular grooves 5a are symmetrically distributed. The width of the sector annular groove 5a is the same as that of the second stator core 10 and is located directly below the second stator core 10. Two protrusions 5b are formed at the connection of the two sector annular grooves 5a, thereby forming an axial excitation induction motor.

[0037] Under the structure of this embodiment, the excitation winding air gap magnetic path 14 generated by the excitation winding 11 is specifically: the excitation winding 11, the second stator core 10, the first air gap, the flywheel rotor 5, the second air gap, the shell 1, the upper cover 2, and the first stator core 9.

[0038] Under the action of the field winding air gap magnetic path 14, a suspension force is generated to suspend the flywheel rotor 5, thereby reducing the bearing pressure. Due to the existence of the first air gap, the first stator core 9 and the second stator core 10 are arranged above the flywheel rotor 5, and the axial space has a heat dissipation channel, which can dissipate heat in the axial direction, so the heat dissipation coefficient is high, and the overall temperature of the motor is low.

[0039] Preferably, the first stator core 9 and the second stator core 10 in this embodiment are both formed by stacking silicon steel sheets.

[0040] Example 2

[0041] like Figure 5 As shown, this embodiment is basically the same as the embodiment 1, except that this embodiment is further provided with a magnetic conductive ring 13, which is fixed to the upper end surface of the lower cover 8, and a third air gap is formed between the magnetic conductive ring 13 and the flywheel rotor 5. The lower cover 8 is made of ferromagnetic material.

[0042] In the structure of this embodiment, in addition to the excitation winding air gap magnetic path 14 in Embodiment 1, a new air gap magnetic path 15 is also formed, which is specifically: excitation winding 11, second stator core 10, first air gap, flywheel rotor 5, third air gap, magnetic ring 13, lower cover 8, shell 1, upper cover 2, first stator core 9.

[0043] This embodiment adds a passage that penetrates the rotor flywheel and reaches the housing 1 through the third air gap and the magnetic conductive ring 13. The existence of the newly added air gap magnetic passage 15 can provide a suspension force below the flywheel rotor 5, and cooperate with the excitation winding air gap magnetic passage 14 above the flywheel rotor 5 to maintain the stability of the suspension force.

[0044] It should be noted that the expressions of upper, lower, etc. in this embodiment are all based on the drawings in the specification and are only used to express the technical solution, and do not limit the scope of protection.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An axially excited induction flywheel rotor energy storage motor, characterized in that: It includes a housing, an upper cover, an upper rotating shaft, a flywheel rotor, a lower rotating shaft, a lower cover, a first stator core, a second stator core, an excitation winding and an armature winding; The shell is sleeve-shaped; the upper cover and the lower cover are respectively arranged on the upper and lower ends of the shell; The first stator core is annular and fixed to the lower end surface of the upper cover, and the excitation winding is arranged on the side wall of the first stator core; The second stator core has a shape corresponding to that of the first stator core and is fixed to the lower end surface of the first stator core. The bottom of the second stator core is provided with a plurality of second slots penetrating the side wall, and the armature winding is arranged in the second slots. The flywheel rotor is arranged in the housing; the upper end of the upper rotating shaft is rotatably connected to the upper cover, and the lower end of the upper rotating shaft is fixed to the upper end surface of the flywheel rotor; the upper end of the lower rotating shaft is fixed to the lower end surface of the flywheel rotor, and the lower end of the lower rotating shaft is rotatably connected to the lower cover; the upper end surface of the flywheel rotor is provided with two fan-shaped annular grooves corresponding to the second stator core, and the two fan-shaped annular grooves are symmetrical to each other; The shell, upper cover and flywheel rotor are made of ferromagnetic materials.

2. The axially excited induction flywheel rotor energy storage motor according to claim 1, characterized in that: It also includes an upper bearing seat and a lower bearing seat; the upper bearing seat is fixed on the upper cover downward, and the lower bearing seat is fixed on the lower cover upward, and the upper bearing seat and the lower bearing seat are made of non-ferromagnetic materials; the upper end of the upper rotating shaft is inserted into the upper bearing seat, and the lower end of the lower rotating shaft is inserted into the lower bearing seat.

3. The axially excited induction flywheel rotor energy storage motor according to claim 1, characterized in that: The lower end of the first stator core is provided with two first slots penetrating the side wall, and two groups of excitation windings are provided. Each group of excitation windings is wound on the two first slots and fits the inner and outer walls of the first stator iron ring to form a fan ring shape. The two groups of excitation windings form a circular ring shape.

4. The axially excited induction flywheel rotor energy storage motor according to claim 1, characterized in that: The armature windings are provided with several groups, each group of armature windings is wound on two of the second notches and fits on the inner and outer walls of the second stator iron ring to form a fan ring shape, and several groups of armature windings form a circular ring shape.

5. The axially excited induction flywheel rotor energy storage motor according to claim 4, characterized in that: There are eighteen second slots, one set of armature windings is wound around every five second slots, and two sets of armature windings are wound around each second slot.

6. The axially excited induction flywheel rotor energy storage motor according to claim 1, characterized in that: The first stator core and the second stator core are both formed by stacking silicon steel sheets.

7. The axially excited induction flywheel rotor energy storage motor according to claim 1, characterized in that: It also includes a magnetic conductive ring, which is fixed on the upper end surface of the lower cover; the lower cover is made of ferromagnetic material.

8. The axially excited induction flywheel rotor energy storage motor according to claim 1, characterized in that: The flywheel rotor is made of alloy casting.

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