Compact permanent magnet synchronous motor for vertical shaft pump

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a compact permanent magnet synchronous motor for a vertical shaft pump. The utility model provides a compact permanent magnet synchronous motor for a vertical shaft pump, which comprises a motor base, a rotating shaft arranged on the motor base, a stator assembly and a rotor, the stator assembly and the rotor are arranged in the motor base and connected with the rotating shaft, a water jacket cavity is arranged in the motor base, and a rotor cooler connected with the water jacket cavity in parallel is arranged on an axial end cover of the motor base. A wire outlet box is arranged on the axial end cover of the base, so that the space occupied by the motor is effectively reduced through the arrangement of the structure and the space, and the motor has a better cooling treatment effect and is suitable for a vertical shaft pump and other application scenes with limited space.

Description

Technical Field

[0001] This utility model belongs to the field of electric motor technology, and in particular relates to a compact permanent magnet synchronous motor for vertical shaft pumps. Background Technology

[0002] With the development of industrial technology, motors are becoming increasingly diversified and specialized, needing to meet the requirements of various industries and different working conditions. In vertical shaft drainage, traditional pump motors are ill-suited to the complex installation environment of shafts. For example, in confined spaces like vertical shafts, ordinary motors may be too large to install, leading to the development of vertical shaft pump motors. Today, with the increasing prominence of energy issues, high efficiency and energy saving have become important development directions for vertical shaft pump motors. Permanent magnet motors, with their rotors using permanent magnet excitation, eliminate excitation losses, slip losses, and rotor losses, resulting in a high power factor. Compared to ordinary motors, they can save more than 10% of electricity, effectively reducing energy consumption and meeting the national requirements for energy conservation and emission reduction.

[0003] Chinese invention patent CN112701835A, published on April 23, 2021, discloses a permanent magnet synchronous motor rotor, including a housing. A front end cover is fixedly installed on one side of the housing to seal the housing and protect its internal structure. A rear end cover is fixedly installed on the other side of the housing to cooperate with the front end cover to fix the rotating shaft, thereby fixing the motor. First bolt holes are provided at the fixed connection points of the front end cover, the rear end cover, and the housing to install bolts. Bolts are installed in the internal threads of the first bolt holes to fix one side of the front end cover to one side of the housing and one side of the rear end cover to the other side of the housing, preventing the front end cover from loosening with the housing and the rear end cover from loosening. Washers are fixedly installed between the bolts and the front end cover and the rear end cover.

[0004] The general usage method and advantages of the permanent magnet synchronous motor rotor in this Chinese invention patent are as follows: The device fixes the housing to the front cover and the rear cover with bolts, which can facilitate the disassembly of the housing to the front cover and the rear cover, and facilitate the user's maintenance of the permanent magnet synchronous motor rotor.

[0005] However, in actual use, the rotor of this permanent magnet synchronous motor still has at least the following shortcomings, which are the technical problems that this utility model aims to solve: it cannot effectively adapt to narrow shaft spaces and cannot be adapted to the special working conditions and requirements of vertical shafts.

[0006] Therefore, in summary, it is necessary to develop a permanent magnet synchronous motor that can be applied to the special working conditions of shaft environments to solve this problem. Utility Model Content

[0007] The utility model provides a compact vertical shaft pump permanent magnet synchronous motor, including the base, the rotating shaft of setting on the base, the stator subassembly and the rotor of setting in the base and with the rotating shaft connection, the base inside is provided with the water jacket cavity, is provided with the rotor cooler with the water jacket cavity parallel on the base axial end cover, is provided with the terminal box on the base axial end cover, make: the utility model discloses through the structure and the space setting effective reduction of the space that the motor occupies effectively, and have good cooling processing effect, be applicable to the vertical shaft pump and other space limited application scene.

[0008] The utility model discloses a compact vertical shaft pump permanent magnet synchronous motor, including the base, the rotating shaft of setting on the base, the stator subassembly and the rotor of setting in the base and with the rotating shaft connection, the base inside is provided with the water jacket cavity, is provided with the rotor cooler with the water jacket cavity parallel on the base axial end cover, is provided with the terminal box on the base axial end cover.

[0009] Further preferred technical solutions are that the cross section of the base is circular.

[0010] Further preferred technical solutions are that the stepped surface connection of the rotating shaft is rounded.

[0011] Further preferred technical solutions are that the side end of the rotor and the rotating shaft connection is provided with a fan, and the upper end of the base is provided with an air outlet.

[0012] Further preferred technical solutions are that the air outlet is at least two, and is provided above the two ends of the stator subassembly, and the air outlet away from the fan is provided with an air extraction device.

[0013] Further preferred technical solutions are that the stator subassembly includes a stator core and a stator winding, and the stator core is provided as an inclined slot.

[0014] Further preferred technical solutions are that the water jacket cavity includes an annular cavity provided with the rotating shaft as the center, a water outlet pipe provided on the upper end of the annular cavity and extending outward, and a connecting pipe provided on the output end of the water outlet pipe and connected with the rotor cooler in parallel.

[0015] Further preferred technical solutions are that the water outlet pipe includes two sub-pipes provided in opposite directions.

[0016] Further preferred technical solutions are that the end of the water outlet pipe and the connecting pipe is provided with a detachable joint.

[0017] Further preferred technical solutions are that the connecting pipe is a hose.

[0018] The present application has at least the following advantages:

[0019] The vertical shaft environment and working requirements of special working conditions can be effectively adapted, the power density of the motor is improved through optimizing the design and manufacturing process of the motor, the slot-pole cooperation of few slots and many poles is adopted, the motor has good performance while reducing the volume, the rated rotating speed is designed to be low, the direct drive of the vertical shaft pump is realized, thereby meeting the demand of high-lift drainage, installation space is saved, and production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0021] Fig. 1 It is a front view half sectional view of the present application;

[0022] Fig. 2 It is a side view of the present application;

[0023] Fig. 3 It is a schematic diagram of the stator of the present application.

[0024] In the drawings, the meanings of various reference signs are as follows:

[0025] The base 1, the rotating shaft 2, the stator assembly 3, the rotor 4, the water jacket cavity 5, the rotor cooler 6, the outlet box 7, the fan 8, and the air outlet 9;

[0026] The stator core 31, the stator winding 32, the annular cavity 51, the water outlet pipe 52, the connecting pipe 53, and the detachable joint 54;

[0027] The branch pipe 521. DETAILED DESCRIPTION

[0028] The embodiments of the present application will be described in detail below with reference to the drawings. The following description is only a preferred embodiment of the present application, and does not limit the scope of the present application.

[0029] In the present specification, the orientation terms such as up, down, left, right, front, back, front, back, top, bottom, etc. are defined with respect to the structure shown in the drawings, and the words "in" and "out" respectively refer to the direction towards or away from the geometric center of a particular component. They are relative concepts, so they can change accordingly according to their different positions, different use states, so these or other orientation terms should not be interpreted as limiting terms.

[0030] As shown in the accompanying drawings Figs. 1-3As shown, a compact shaft pump permanent magnet synchronous motor, comprising a base 1, a rotating shaft 2 arranged on the base 1, a stator assembly 3 and a rotor 4 arranged in the base 1 and connected with the rotating shaft 2; the base 1 is internally provided with a water jacket cavity 5, and the rotor cooler 6 and the terminal box 7 are arranged on the axial end cover of the base 1.

[0031] In this embodiment, the compact shaft pump permanent magnet synchronous motor is generally used as follows:

[0032] The base 1 is used as the main structure of the motor to support and accommodate other components, wherein the rotating shaft 2 is arranged on the base to transmit power and torque, when three-phase alternating current is input into the stator assembly 3, a rotating magnetic field is generated, and the direction and size change with the change of input current, the rotor 4 is installed with permanent magnets, which interact with the rotating magnetic field generated by the stator assembly 3 to generate electromagnetic torque to make the rotor 4 rotate, thereby ensuring the normal operation of the motor, during operation, the heat generated by overheating will cause damage to the motor, therefore, the water jacket cavity 5 is arranged inside the base 1 and the rotor cooler is arranged outside the base for cooling, wherein the rotor cooler 6 and the water jacket cavity 5 are not connected, but are arranged in parallel, the cooling liquid circulates through the water jacket cavity 5 to effectively take away the heat generated during operation, the terminal box 7 is used to lead out the power lines and control lines related to the motor and is electrically connected with the external control system to realize overall power supply and control; in order to further adapt to the working condition of the motor in the shaft or narrow space, the rotor cooler 6 and the terminal box 7 are arranged on the axial end cover, which does not occupy the transverse space of the body, and can avoid the situation that it is impossible to enter the narrow shaft due to the influence of other components.

[0033] As a preferred embodiment of the present embodiment, the cross section of the base 1 is circular.

[0034] In this embodiment, when applied to the environment of the shaft, the circular cross section of the main structure has smaller occupied space and more sufficient accommodation volume compared with the conventional box type motor or other shapes.

[0035] As a preferred embodiment of the present embodiment, the stepped surface connection of the rotating shaft 2 is rounded.

[0036] In this embodiment, the rotating shaft 2 has multiple sections with different sizes to form multiple steps, and the stepped surface connection between the steps is rounded for transition, the rounded design can effectively reduce the stress concentration caused by the sudden change of cross section, and the flat transition can improve the strength and rigidity of the rotating shaft 2, further, the heat treatment process is used to improve the strength, hardness and toughness of the rotating shaft 2, so that the hardness reaches HRC43~51, and the rotating shaft has high fatigue resistance to effectively prevent failure during operation.

[0037] As a preferred embodiment of the present application, the rotor 4 is provided with a fan 8 at the side end connected with the rotating shaft 2, and the upper end of the machine base 1 is provided with air outlets 9; the air outlets 9 are at least two, respectively arranged above the two ends of the stator assembly 3, and the air outlet 9 far away from the fan 8 is provided with an air extraction device.

[0038] In the present embodiment, the fan 8 arranged at the end close to the rotor 4 can effectively improve the heat dissipation efficiency, strengthen the heat dissipation of the internal core and magnetic steel, delay the temperature rise of the motor, and prolong the service life of the motor; the fan 8 is arranged at one end to provide air flow to the component concentration area, and the cold air passes through multiple components and is blown out from the air outlet 9 at the upper end of the machine base 1; preferably, to make the air flow blocked by the components smoothly flow out of the machine body, at least two air outlets are provided at the two ends of the machine base, and the air outlet far away from the fan 8 is provided with an air extraction device, which can guide the cold air to flow out after passing through multiple components such as the rotor and the stator assembly, thereby improving the air cooling effect; the air extraction device can be an air extractor, or the fan wheel at the air outlet can be arranged under the action of an external centrifugal fan, and the fan body does not occupy the horizontal external space and can be arranged at the axial end or the inner side of the machine body.

[0039] As a preferred embodiment of the present application, the stator assembly 3 includes a stator core 31 and a stator winding 32, and the stator core 31 is arranged in a slant slot.

[0040] In the present embodiment, the stator core 31 adopts a few-slot multi-stage slot level cooperation, and the slant arrangement of the slot can reduce the air gap between the stator coil and the core, reduce the magnetic flux leakage, weaken the tooth harmonic electromagnetic torque, thereby reducing the additional loss, vibration and noise of the motor, improving the running stability and efficiency of the motor, and the slant slot effectively increases the surface area of the stator core, which can dissipate heat faster and control the temperature rise.

[0041] As a preferred embodiment of the present application, the water jacket cavity 5 includes an annular cavity 51 arranged around the rotating shaft 2, a water outlet pipe 52 arranged at the upper end of the annular cavity 51 and extending outward, and a connecting pipe 53 arranged at the output end of the water outlet pipe 52 and connected with the rotor cooler 6 in parallel.

[0042] In the present embodiment, the cooling liquid circulates in the machine box through the water jacket cavity 5, the annular cavity 51 serves as the main body of internal circulation, can be closest to the internal components and cooperate with the shape of the machine body, increase the contact area between the cooling liquid and the heat source, under the same supply conditions, the annular design can more effectively disperse heat compared with straight lines or other planar shapes, and the annular cavity helps the cooling liquid to flow stably and uniformly, avoids the flow dead angle and hot spot caused by the broken line, and improves the heat exchange performance; the annular cavity 51 is connected with the water outlet pipe 52 extending outside the machine body, and the connecting pipe 53 is connected with the rotor cooler 6 in parallel.

[0043] As a preferred embodiment of the present embodiment, the water outlet pipe 52 comprises two branch pipes 521 arranged towards opposite directions, and the end of the water outlet pipe 52 and the connecting pipe 53 is provided with a detachable joint 54.

[0044] In the present embodiment, the water outlet pipe 52 comprises two branch pipes 521 for improving the overall circulation efficiency, wherein the two branch pipes are arranged towards opposite directions to adapt to different working conditions, and the detachable joint 54 is used to adjust the overall design, including a flange plate arranged at the end of the pipe, and a plurality of bolts for connecting the two flange plates.

[0045] As a preferred embodiment of the present embodiment, the connecting pipe 53 is a hose.

[0046] Compared with the prior art, the technical solution has the advantages that the hose design of the connecting pipe 53 can effectively compress the space occupied by the pipe, and has great flexibility, and the connecting pipe can be made of a polytetrafluoroethylene pipe, a rubber pipe, an ethylene-propylene-diene copolymer pipe, etc., all of which have good chemical stability and heat resistance.

[0047] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art in the technical field without departing from the purpose of the present application. These are all non-creative modifications, and as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A compact shaft pump permanent magnet synchronous motor, characterized by, The utility model provides a kind of motor, including base (1), the rotating shaft (2) being arranged on the base (1), the stator assembly (3) and rotor (4) being arranged in the base (1) and being connected with the rotating shaft (2);Water jacket cavity (5) is provided inside the base (1), and rotor cooler (6) and outlet box (7) are provided on the axial end cover of the base (1).

2. A compact vertical shaft pump permanent magnet synchronous motor according to claim 1, characterized in that, The cross section of the base (1) is circular.

3. A compact vertical shaft pump permanent magnet synchronous motor according to claim 1, characterized in that, The step surface connection of the rotating shaft (2) is round.

4. A compact vertical shaft pump permanent magnet synchronous motor according to claim 1, characterized in that, The side end of the connection between the rotor (4) and the rotating shaft (2) is provided with fan (8), and the upper end of the base (1) is provided with air outlet (9).

5. A compact vertical shaft pump permanent magnet synchronous motor according to claim 4, characterized in that, The air outlet (9) is at least two, respectively arranged above the two ends of the stator assembly (3), and the air outlet (9) away from the fan (8) is provided with exhaust device.

6. A compact vertical shaft pump permanent magnet synchronous motor according to claim 1, characterized in that, The stator assembly (3) includes stator core (31) and stator winding (32), and the stator core (31) is arranged as inclined slot.

7. A compact vertical shaft pump permanent magnet synchronous motor according to claim 1, characterized in that, The water jacket cavity (5) includes annular cavity (51) arranged with the rotating shaft (2) as center, water outlet pipe (52) arranged on the upper end of the annular cavity (51) and extending outward, and connecting pipe (53) arranged on the output end of the water outlet pipe (52) and connected with the rotor cooler (6) in parallel.

8. A compact shaft pump permanent magnet synchronous motor according to claim 7, characterized in that, The water outlet pipe (52) includes two branch pipes (521) arranged towards opposite directions.

9. A compact vertical shaft pump permanent magnet synchronous motor according to claim 7, characterized in that, The end of the water outlet pipe (52) and the connecting pipe (53) is provided with detachable joint (54).

10. A compact vertical shaft pump permanent magnet synchronous motor according to claim 7, characterized in that, The connecting pipe (53) is hose.

Images