Mechanical energy and electric energy conversion output motor and assembling method thereof

Abstract

The invention relates to the field of electrical engineering, in particular to a mechanical energy and electric energy conversion output motor and an assembling method thereof.The motor comprises a rotor steel ring, a permanent magnet, a ferrite stator core, a three-phase stator winding, a stator core base, a disc support, a rotor disc, a bearing, a bearing bush, a flange coupler and a rotating shaft; the ferrite stator iron core is installed in the stator iron core base, the three-phase stator winding is wound on the ferrite stator iron core, the stator iron core base is connected with the bearing bush through the disc support, the rotating shaft is sleeved with the bearing bush, and the bearing is installed between the bearing bush and the rotating shaft. The flange coupling sleeves the rotating shaft and is in key connection with the rotating shaft, the rotor disc sleeves the flange coupling and is connected with the rotor steel ring, and the permanent magnet is connected to the inner side of the rotor steel ring and located on the outer side of the ferrite stator iron core. According to the invention, the service life of the stator core can be prolonged, and the functions of the motor and the generator are integrated.

Description

Technical Field

[0001] The present invention belongs to the field of electrical engineering technology, and in particular relates to a motor for converting mechanical energy into electrical energy and an assembly method thereof. Background Art

[0002] An electric motor is a device that converts electrical energy into mechanical energy. The electric motor is mainly composed of a stator, a rotor and other accessories. The stator includes a stator core and a stator winding. The working principle of the electric motor is to apply voltage to the stator winding to generate a rotating magnetic field and act on the rotor to form a magneto-electromotive force rotation torque. The direction of the force on the current-carrying wire in the magnetic field is related to the direction of the current and the direction of the magnetic flux lines (magnetic field direction). The working principle of the electric motor is that the magnetic field acts on the force on the current, causing the motor to rotate.

[0003] A generator is a device that converts mechanical energy into electrical energy. It is usually composed of a stator, a rotor, an end cover, a bearing and other components. The stator is mainly composed of a stator core, a coil winding, a frame and other structural parts that fix these parts. The rotor is mainly composed of a rotor core, a coil winding, a guard ring, a center ring, a slip ring, a fan and a shaft. The working principle of the generator is that the rotor rotates in the stator and cuts the magnetic lines of force, thereby generating an induced potential, which is connected to the circuit through the wiring terminals to generate current.

[0004] Electric motors and generators are mainly manufactured and designed using electrical steel as the stator core. The disadvantage of using electrical steel as the stator core is that when the frequency of the electrical steel exceeds 0.7-0.8kHz, the magnetic loss of the stator core will increase sharply. The sharp increase in magnetic loss will cause the stator core to heat up rapidly and even overheat, which can easily cause damage to the stator core.

[0005] At present, there is a lack of motors on the market that combine the functions of an electric motor and a generator. If both functions are to be realized, it is often necessary to equip both an electric motor and a generator at the same time, which increases the cost of use. Summary of the invention

[0006] In view of this, the present invention aims to provide a motor for converting mechanical energy into electrical energy and an assembly method thereof, so as to solve the technical problems of the prior art of using electrical steel as the stator core with limited frequency and the lack of integration of the motor and the generator.

[0007] To achieve the above object, the technical solution created by the present invention is implemented as follows: A motor for converting mechanical energy into electrical energy for output comprises a rotor steel ring, a permanent magnet, a ferrite stator core, a three-phase stator winding, a stator core base, a disc bracket, a rotor disc, a bearing, a bearing bushing, a flange coupling and a rotating shaft; wherein the ferrite stator core is installed in the stator core base, the portion of the ferrite stator core exposed from the stator core base is wound with the three-phase stator winding, the stator core base is connected to the bearing bushing through the disc bracket, the bearing bushing is sleeved on the rotating shaft, and the bearing is installed between the bearing bushing and the rotating shaft, the flange coupling is sleeved on the rotating shaft and is keyed to the rotating shaft, the rotor disc is sleeved on the flange coupling and connected to the rotor steel ring, the permanent magnet is connected to the inner side of the rotor steel ring, and the permanent magnet is located on the outer side of the ferrite stator core.

[0008] Furthermore, the ferrite stator core is an integrated structure or a split structure.

[0009] Furthermore, when the ferrite stator core is an integrated structure, the ferrite stator core is a toroidal body as a whole, and grooves for winding three-phase stator windings are processed on the outer ring of the toroidal body.

[0010] Furthermore, when the ferrite stator core is a split structure, the ferrite stator core is composed of stator core units spliced ​​into a circular ring, and the stator core units are L-shaped, T-shaped, U-shaped or E-shaped.

[0011] Further, when the stator core unit is L-shaped or T-shaped, a positioning protrusion is formed at one joint of the stator core unit, and a positioning groove is formed at another joint of the stator core unit.

[0012] Furthermore, the coils of each phase of the three-phase stator winding are alternately wound on the ferrite stator core in a predetermined order.

[0013] Furthermore, the flange portion of the flange coupling is fixedly connected to the rotor disk.

[0014] Furthermore, there are two disc brackets, and a step structure is formed on opposite sides of the two disc brackets for limiting the stator core base.

[0015] A method for assembling the above-mentioned motor for converting mechanical energy into electrical energy comprises the following steps: S1: Connect the stator core base to the disc bracket, and then connect the disc bracket to the bearing bushing; S2: installing the ferrite stator core in the stator core base, winding a three-phase stator winding on a portion of the ferrite stator core exposed from the stator core base, and installing a bearing in a bearing bushing; S3: Bond the permanent magnet to the inner side of the rotor steel ring and install the rotor disk to one end of the rotor steel ring; S4: Connect the flange coupling to the rotor disk, insert the rotating shaft with pre-installed flat key into the flange coupling and bearing to complete the assembly.

[0016] Compared with the prior art, the invention can achieve the following beneficial effects: 1. Using ferrite instead of electrical steel as the stator core can reduce magnetic loss, improve the stator core temperature and increase the service life of the stator core.

[0017] 2. Get rid of the frequency limit of 0.7-0.8kHz and increase the speed of the motor.

[0018] 3. The functions of the motor and generator are integrated into one, which can output both electrical energy and mechanical energy, and can be switched freely to reduce the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings: Figure 1 A schematic diagram of the structure of a motor for converting mechanical energy into electrical energy according to an embodiment of the present invention; Figure 2 for Figure 1 Partial cross-sectional view along line AA; Figure 3 A schematic diagram of the structure of the stator core unit of the embodiment of the present invention is an L-shaped structure; Figure 4 The stator core unit described in the embodiment of the present invention is a schematic diagram of an improved L structure; Figure 5 A schematic diagram of a U-shaped stator core unit according to an embodiment of the present invention; Figure 6 A schematic diagram of the structure of the stator core unit of the embodiment of the present invention is an E-type; Figure 7 A schematic diagram of the winding method of the three-phase stator winding described in an embodiment of the present invention.

[0020] Explanation of the reference numerals: rotor steel ring 1, permanent magnet 2, ferrite stator core 3, three-phase stator winding 4, stator core base 5, disc bracket 6, rotor disc 7, bearing bushing 8, flange coupling 9, rotating shaft 10, flat key 11, bearing 12. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the invention more clear, the invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the invention and do not constitute a limitation of the invention.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] like Figure 1 and Figure 2As shown, the present invention provides a motor for converting mechanical energy into electrical energy, including a rotor steel ring 1, a permanent magnet 2, a ferrite stator core 3, a three-phase stator winding 4, a stator core base 5, a disc bracket 6, a rotor disc 7, a bearing bushing 8, a flange coupling 9, a rotating shaft 10, a flat key 11 and a bearing 12; wherein, a shaft shoulder is formed on the rotating shaft 10, the inner ring of the bearing 12 is sleeved on the rotating shaft 10 and clamped at the shaft shoulder, the bearing 12 can prevent the rotating shaft 10 from moving axially, the bearing bushing 8 is sleeved on the outer ring of the bearing 12, the number of disc brackets 6 is two, which are coaxially sleeved on the bearing bushing 8, and are fixedly connected to the bearing bushing 8 by bolts, and the bearing bushing 8 also plays a role The function of fixing the bearing 12 and connecting the disc bracket 6 is that a step structure is formed on the opposite side of the two disc brackets 6 to limit the stator core base 5. The stator core base 5 is an annular structure. The inner ring of the stator core base 5 is inserted into the gap between the two disc brackets 6 and is limited by the step structure. The stator core base 5 and the two disc brackets 6 are fixed by bolts. A circle of limiting grooves is processed along the circumferential direction on the outer ring of the stator core base 5. The ferrite stator core 3 is installed in the limiting groove of the stator core base 5. The installation and fixation of the ferrite stator core 3 is realized by the stator core base 5. The part of the ferrite stator core 3 exposed from the stator core base 5 is wound with the three-phase stator winding 4.

[0027] The ferrite stator core 3 and the three-phase stator winding 4 form a stator. Based on the arrangement of the bearing 12 , the bearing bushing 8 and the stator do not rotate with the rotating shaft 10 .

[0028] The flange coupling 9 is mounted on the rotating shaft 10, and the flange coupling 9 and the rotating shaft 10 are connected by a flat key 11. The flat key 11 can be replaced by a semicircular key, a wedge key, a tangential key or a spline. The rotor disk 7 is a disc structure, and a step structure is formed on the inner edge of the rotor disk 7. During assembly, the flange coupling 9 is clamped in the step structure of the rotor disk 7, and then the flange coupling 9 and the rotor disk 7 are fixed by bolts. The outer edge of the rotor disk 7 is fixedly connected to the port of the rotor steel ring 1 by bolts, and the permanent magnet 2 is bonded to the side of the rotor steel ring 1 facing the ferrite stator core 3. The position of the permanent magnet 2 is opposite to the position of the ferrite stator core 3, and is located on the outside of the ferrite stator core 3. The flange coupling 9 is used to connect the rotor disk 7 and the rotating shaft 10, and transmit the torque of the rotating shaft 10 to the rotor disk 7. The rotor steel ring 1 , the permanent magnet 2 , and the rotor disk 7 form a rotor. Based on the setting of the flange coupling 9 , the rotor rotates synchronously with the rotating shaft 10 .

[0029] The stator core of the present invention is made of ferrite material. Ferrite is a kind of magnetic material composed of iron oxide (Fe2O3) and other metal oxides (such as NiO, MgO, ZnO, MnO, CuO, BaO, etc.). Ferrite is a compound with a complex structure. The composition of ferrite can be expressed by the formula: МеО Fe2O3; Here, Me refers to a divalent metal.

[0030] The resistivity fluctuation range of ferrite is 10 5 Up to 10 8 Ω·m, while the resistivity of electrical steel does not exceed 10 –6 Ω·m. It can be seen that ferrite has an extremely high resistivity. The higher the resistivity, the smaller the eddy current, and the smaller the eddy current, the less magnetic loss. Therefore, the present invention uses ferrite instead of electrical steel to significantly reduce magnetic loss. When the frequency of the ferrite stator core 3 exceeds 0.7-0.8kHz, it will not heat up quickly and be damaged by overheating.

[0031] The ferrite stator core 3 can be an integrated structure or a split structure. When the ferrite stator core 3 is an integrated structure, the ferrite stator core 3 is a torus as a whole, and a circle of grooves for winding the three-phase stator winding 4 is processed along the circumference of the outer ring of the torus. When the ferrite stator core 3 is a split structure, the ferrite stator core 3 is composed of multiple stator core units spliced ​​together, and the whole after the multiple stator core units are spliced ​​together is a torus. The stator core units can adopt a variety of shapes, such as Figure 3 The L-shaped structure shown, the T-shaped structure (not shown), Figure 5 The U-shaped structure shown in Figure 6 In the E-type structure shown, the three-phase stator winding 4 is wound between two adjacent grooves.

[0032] When the stator core unit adopts an L-shaped structure, two adjacent stator core units of the L-shaped structure form a U-shaped arm, and the three-phase stator winding 4 is wound on the U-shaped arm. Similarly, when the stator core unit adopts a U-shaped structure, the stator core unit of the U-shaped structure itself forms a U-shaped arm, and when the stator core unit adopts an E-shaped structure, the stator core unit of the E-shaped structure itself forms two U-shaped arms.

[0033] As an improved structure of L-type structure, Figure 4As shown, the L-shaped stator core unit has two joints in the horizontal part, one joint forms a spherical positioning protrusion, and the other joint forms a spherical positioning groove. The two L-shaped stator core units are spliced ​​together by the cooperation of the positioning groove and the positioning protrusion. This splicing method has two advantages. One is that the opening angle of the U-shaped arm is increased, and the other is that the contact between the two adjacent stator core units is closer and the splicing is more stable.

[0034] When the stator core unit adopts a T-type structure, it is similar to the L-type structure, so it will not be described in detail.

[0035] The winding method of the three-phase stator winding 4 is as follows Figure 7 As shown, the A-phase winding, the B-phase winding, and the C-phase winding are alternately wound on the ferrite stator core in a periodic manner, startA, startB, and startC are the A-phase winding, the B-phase winding, and the C-phase winding, and EndA, EndB, and EndC are the beginning and end winding places of the A-phase winding, the B-phase winding, and the C-phase winding respectively.

[0036] The motor for converting mechanical energy into electrical energy provided by the embodiment of the present invention can be used as both a motor and a generator. When used as a motor, it outputs torque through a rotating shaft. When used as a generator, it outputs electrical energy through a stator.

[0037] When the rotating shaft is driven to rotate, the rotor steel ring with permanent magnets is driven to rotate, and the direction and size of the magnetic flux in the ferrite stator core change, thereby forming an electromotive force in the three-phase stator winding and generating electric energy. When a sinusoidal pulse power supply voltage is applied to the three-phase stator winding, under the action of the voltage, the current flows through the turns of the three-phase stator winding, generating a magnetomotive force, overcoming the magnetic resistance of the magnetic circuit to form a magnetic flux, which acts on the permanent magnet, thereby generating a magnetic attraction and driving the rotor steel ring to rotate, and the rotating shaft generates torque. The present invention can switch the output mechanical energy and electrical energy according to actual needs.

[0038] The above content describes in detail the structure and working principle of the motor for converting mechanical energy into electrical energy and outputting electrical energy according to the embodiment of the invention. The embodiment of the invention also provides an assembly method for the motor for converting mechanical energy into electrical energy and outputting electrical energy, comprising the following steps: S1: Connect the stator core base to the disc bracket, and then connect the disc bracket to the bearing bushing.

[0039] S2: Install the ferrite stator core in the stator core base, wind the three-phase stator winding on the portion of the ferrite stator core exposed from the stator core base, and install the bearing in the bearing bushing.

[0040] S3: Bond the permanent magnets to the inner side of the rotor steel ring and install the rotor disk to one end of the rotor steel ring.

[0041] S4: Connect the flange coupling to the rotor disk, insert the rotating shaft with pre-installed flat key into the flange coupling and bearing to complete the assembly.

[0042] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the disclosure of the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0043] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor for converting mechanical energy into electrical energy, characterized in that: It includes a rotor steel ring, a permanent magnet, a ferrite stator core, a three-phase stator winding, a stator core base, a disc bracket, a rotor disc, a bearing, a bearing bushing, a flange coupling and a rotating shaft; wherein, The ferrite stator core is installed in the stator core base, the part of the ferrite stator core exposed from the stator core base is wound with the three-phase stator winding, the stator core base is connected to the bearing sleeve through the disc bracket, the bearing sleeve is sleeved on the rotating shaft, and the bearing is installed between the bearing sleeve and the rotating shaft, the flange coupling is sleeved on the rotating shaft and key-connected to the rotating shaft, the rotor disk is sleeved on the flange coupling and connected to the rotor steel ring, the permanent magnet is connected to the inner side of the rotor steel ring, and the permanent magnet is located on the outer side of the ferrite stator core.

2. The motor for converting mechanical energy into electrical energy according to claim 1, characterized in that: The ferrite stator core is an integrated structure or a split structure.

3. The motor for converting mechanical energy into electrical energy according to claim 2, characterized in that: When the ferrite stator core is an integrated structure, the ferrite stator core is a toroidal body as a whole, and grooves for winding the three-phase stator winding are processed on the outer ring of the toroidal body.

4. The motor for converting mechanical energy into electrical energy according to claim 2, characterized in that: When the ferrite stator core is a split structure, the ferrite stator core is composed of stator core units spliced ​​into a circular ring, and the stator core units are L-shaped, T-shaped, U-shaped or E-shaped.

5. The motor for converting mechanical energy into electrical energy according to claim 4, characterized in that: When the stator core unit is L-shaped or T-shaped, a positioning protrusion is formed at one joint of the stator core unit, and a positioning groove is formed at another joint of the stator core unit.

6. The motor for converting mechanical energy into electrical energy according to claim 1, characterized in that: The coils of each phase of the three-phase stator winding are alternately wound on the ferrite stator core in a predetermined order.

7. The motor for converting mechanical energy into electrical energy according to claim 1, characterized in that: The flange part of the flange coupling is fixedly connected to the rotor disk.

8. The motor for converting mechanical energy into electrical energy according to claim 1, characterized in that: There are two disc supports, and a step structure is formed on opposite sides of the two disc supports for limiting the position of the stator core base.

9. A method for assembling a motor for converting mechanical energy into electrical energy as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1: Connecting the stator core base to the disc bracket, and then connecting the disc bracket to the bearing bushing; S2: installing the ferrite stator core in the stator core base, winding the three-phase stator winding on the portion of the ferrite stator core exposed from the stator core base, and installing the bearing in the bearing bushing; S3: bonding the permanent magnet to the inner side of the rotor steel ring, and installing the rotor disk to one end of the rotor steel ring; S4: Connect the flange coupling to the rotor disk, insert the rotating shaft pre-installed with a flat key into the flange coupling and the bearing to complete the assembly.

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