CN217010559U - Three-phase asynchronous motor with electromagnetic interference resistance - Google Patents
Three-phase asynchronous motor with electromagnetic interference resistance Download PDFInfo
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- CN217010559U CN217010559U CN202122832342.8U CN202122832342U CN217010559U CN 217010559 U CN217010559 U CN 217010559U CN 202122832342 U CN202122832342 U CN 202122832342U CN 217010559 U CN217010559 U CN 217010559U
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Abstract
The utility model provides a three-phase asynchronous motor with electromagnetic interference resistance, and relates to the technical field of three-phase asynchronous motors. The utility model designs a stainless steel metal shell capable of shielding electromagnetic interference on the basis of a high-efficiency three-phase asynchronous motor, wherein parts such as a motor end cover, a base, a bearing, a junction box, a fan cover and the like are made of non-magnetic materials, and all parts are assembled and welded and finely processed to meet the design requirements. In order to ensure the performance of the motor, the main shaft is made of conventional carbon steel at the iron core body section, and stainless steel is welded on the outer circles of the shaft extension sections at two ends. The motor lead is connected with a power supply by a cable with a shield. The interference and influence of electromagnetic waves generated by the running of the three-phase asynchronous motor on peripheral equipment are effectively solved, and the energy-saving and safe use requirements of the motor on special equipment facilities such as ships and warships are met.
Description
Technical Field
The utility model relates to the technical field of three-phase asynchronous motors, in particular to a three-phase asynchronous motor with electromagnetic interference resistance.
Background
When the three-phase asynchronous motor operates, electromagnetic waves are generated, and the radiated and conducted electromagnetic waves influence the normal operation of various electronic and electrical equipment. In particular, electromagnetic waves in motors used in special equipment facilities such as ships and warships are subject to electromagnetic interference in communication equipment, automatic control systems, and computer systems for offices and military use. Therefore, a three-phase asynchronous motor which can shield electromagnetic interference and meet the energy-saving and safe use requirements of motors on special equipment facilities such as ships and warships is very important.
In patent CN201810471953.4, an electric machine and an electromagnetic interference protection device for the electric machine are disclosed. The motor includes: the rotor is rotatably arranged on the shaft tube, the circuit board is provided with a guide connection part and a grounding part, the guide connection part is electrically connected with the second conductive part, and the grounding part is electrically connected with the guide connection part. Therefore, the motor and the electromagnetic interference protection device can prevent related electronic elements or devices adjacent to the motor from suffering electromagnetic interference so as to improve the protection effect of the electromagnetic interference.
In patent CN201510334961.0, an electromagnetic field shielding system for driving motor of electric vehicle is disclosed, in which a plurality of power surge protectors and signal lines are installed between the outer shield and the driving motor, and a control circuit protector absorbs and unloads the current induced by the electromagnetic field of the motor on the power line and the signal line, so that it can not penetrate the shield to form a new strong electromagnetic field, and reaches the medical standard that the magnetic field strength of the driving motor of electric vehicle is less than 0.4 μ T in the range of 0.6 m, after the driving motor of electric vehicle without electromagnetic field radiation, it can drive and take the electric vehicle in the driver's position in the range of 0.6 m for a long time. After the electric automobile driving motor without magnetic radiation is provided, the electric automobile can be popularized vigorously to replace the existing automobile taking gasoline and diesel oil as fuel, so that the environmental pollution in the world is fundamentally treated.
In patent CN201610310598.3, an external electromagnetic pulse attack shielding system for an electric vehicle motor controller is disclosed, in which a signal line, a control circuit protector, a first power surge protector, a second power surge protector and a third power surge protector installed inside an outer shield of the motor controller absorb currents induced by an external electromagnetic field on the shield, the signal line, the first power line, the second power line, the coolant inlet and the coolant outlet, so that the remaining currents cannot induce a new strong earth electromagnetic field to attack the motor controller, thereby achieving the purpose of shielding the external electromagnetic field to protect the motor controller, protecting the internal electronic devices of the electric vehicle motor controller from being damaged by the external strong electromagnetic field, and enabling the temperature of the electric vehicle motor controller to be unchanged when the electric vehicle is operated under a large load by a cooling liquid cooling system, the technology can protect the motor controller of the electric automobile to operate according to the design requirement.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a three-phase asynchronous motor with electromagnetic interference resistance. On the basis of a high-efficiency three-phase asynchronous motor, a stainless steel metal shell capable of shielding electromagnetic interference is designed, wherein parts such as a motor end cover, a base, a bearing, a junction box, a fan cover and the like are all made of non-magnetic austenitic stainless steel 022Cr17Ni12Mo2, and according to a process test evaluation scheme, special stainless steel welding rods and protective gas are selected to assemble, weld and finish various parts to the design requirements. In order to ensure the performance of the motor, the main shaft is made of conventional carbon steel material at the iron core body section, and stainless steel is welded on the excircle of the shaft extension sections at two ends. The motor lead is connected with a power supply by a shielded cable. The interference and influence of electromagnetic waves generated by the running of the three-phase asynchronous motor on peripheral equipment are effectively solved, and the energy-saving and safe use requirements of the motor on special equipment facilities such as ships and warships are met.
The purpose of the utility model is realized by the following technical scheme:
a three-phase asynchronous motor with electromagnetic interference resistance, comprising a stator, a rotor and a metal shell, wherein:
the metal shell is formed by welding a motor end cover, a base, a bearing and a junction box;
the rotor is arranged on the main shaft; the main shaft is arranged in the base;
bearings are arranged at two ends of the main shaft, and motor end covers are arranged at two ends of the base;
a wave-shaped spring leaf is arranged between the bearing and the motor end cover;
a sealing ring is also arranged between the main shaft and the motor end cover;
a fan is installed at one end of the main shaft, a fan cover is arranged outside the fan, and the fan cover is fixedly connected with an end cover of the motor through a bolt;
the motor end cover, the base, the bearing, the junction box and the fan cover are all made of non-magnetic materials;
the engine base is of a cylindrical structure, a support is arranged at the bottom of the engine base, and a plurality of radiating ribs are arranged on the circumference of the outer wall of the engine base; a junction box is also arranged on one side of the base;
the sectional area of the conducting bar of the stator is 5.3-6.5mm 2;
the sectional area of the conducting bar of the rotor is 130-150mm 2;
the length of the end part of the winding is 80-85mm, and a concentric winding is adopted;
the length of the iron core is 150-170mm, so that the winding loss of the stator and the rotor is reduced;
selecting three circles as phi 265-275/phi 150-160/phi 55-65 mm;
the air gap is not less than 0.85mm, the groove fit is 36/28, and the groove type is selected as follows: stator pear-shaped grooves and rotor knife-shaped grooves;
selecting a rotor weight not to exceed 28 kg;
the bearing model is 6309-2 RZ/C3;
the cooling mode is selected as IC411, and the non-transmission end shaft is provided with a fan, so that the fan, the heat dissipation surface of the base and the like are matched with the heat dissipation performance of the motor, and the ventilation loss is reduced.
Optionally or preferably, one section of the spindle in the base is made of conventional carbon steel materials, and two sections of the excircle of the spindle outside the base are subjected to surfacing welding of stainless steel.
Optionally or preferably, the motor lead in the junction box is connected with a power supply by using a shielded cable, so that the continuity of electromagnetic shielding is ensured.
Optionally or preferably, seams where the motor end cover is connected with the base, the junction box and the like are all in spigot fit, and are provided with sealant, so that the continuity of electromagnetic shielding can be ensured.
Optionally or preferably, the motor end cover, the base, the bearing, the junction box and the fan cover are all made of 022Cr17Ni12Mo2 austenitic stainless steel.
Based on the technical scheme, the following technical effects can be generated:
the utility model provides a three-phase asynchronous motor with electromagnetic interference resistance, which is suitable for being used on special equipment facilities such as ships and warships. The utility model improves the efficiency of the three-phase asynchronous motor by specially designing the rotor, the stator and the wind path, effectively solves the interference and influence of electromagnetic waves generated by the running of the three-phase asynchronous motor on peripheral equipment by arranging the stainless steel metal shell capable of shielding electromagnetic interference outside the motor, and meets the energy-saving and safe use requirements of the motor on special equipment facilities such as ships and warships. The beneficial effects specifically include:
1. an advanced finite element calculation simulation analysis means is adopted to carry out accurate analysis on the motor loss, the comparison is optimized, and the three circles, the groove matching, the pitch and the groove type are reasonably selected to improve the magnetic circuit distribution and reduce the stator iron loss;
2. the design of the inner and outer air paths of the motor is optimized, the wind resistance is reduced, and the heat dissipation performance of the fan, the heat dissipation surface of the base and the like is matched with that of the motor, so that the ventilation loss is reduced;
3. the weight of the rotor is reduced, and the bearing model selection is reasonably carried out, so that the friction loss of the bearing is reduced;
4. the loss of the stator and rotor windings is reduced by increasing the sectional area of the conducting bar, reducing the length of the end part of the winding, reducing the pitch, shortening the length of the iron core and other measures;
5. the total stray loss is reduced by selecting proper groove matching, enlarging an air gap, pickling the rotor chute and the rotor surface, adopting a closed groove and other measures;
6. the motor end cover, the base, the junction box, the fan cover and other parts are all made of non-magnetic austenitic stainless steel 022Cr17Ni12Mo2, and a stainless steel metal shell capable of shielding electromagnetic interference is provided;
7. the main shaft adopts the conventional carbon steel material in the iron core body section, stainless steel is welded on the excircle of the shaft extension sections at two ends, the motor lead adopts a cable with a shielding layer to connect with a power supply, and seams where the motor end cover is connected with a machine base, a junction box and the like are matched by rabbets and are provided with sealant, so that the continuity of electromagnetic shielding is ensured;
8. the high-efficiency three-phase asynchronous motor with the electromagnetic interference resistance is convenient to use, has relatively reasonable cost, and meets the requirement of batch production;
9. the motor of the utility model has simple structure and low operation labor intensity, can be popularized and applied in large scale by utilizing the prior automatic welding, numerical control processing and other technologies, and can create greater economic benefit and social benefit.
The utility model discloses a motor spindle welding method, which comprises the following steps:
s1, preheating a magnetic isolation part of the main shaft to 100 ℃;
s2, overlaying a magnetic shielding part of the main shaft by using a stainless steel welding wire E309 with the diameter of 1.2mm, wherein the current is 130-240A, the voltage is 28-34V, the overlaying is required to be symmetrically performed in a segmented mode during overlaying, the temperature between layers is controlled not to exceed 200 ℃ in the overlaying process, the protective gas is pure carbon dioxide, and the gas purity is more than 99.8%;
s3, immediately wrapping the surfacing part by asbestos cloth after surfacing is finished, and removing the asbestos cloth after the surfacing part is slowly cooled to normal temperature;
s4, annealing the main shaft to release stress, and the process parameters are as follows: the temperature is kept at 610 +/-10 ℃ for 120 min.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural view (half-sectional view) of the present invention;
FIG. 2 is a schematic view (left side view) of the structure of the stand according to the present invention;
FIG. 3 is a schematic structural view of the spindle of the present invention;
in the figure: 1-sealing ring, 2-wave spring piece, 3-bearing, 4-motor end cover, 5-stator, 6-lifting bolt, 7-rotor, 8-fan cover, 9-fan, 10-junction box and 11-heat dissipation rib.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1-3:
the utility model provides a three-phase asynchronous motor with electromagnetic interference resistance, which comprises a stator 5, a rotor 7 and a metal shell, wherein:
the metal shell is formed by welding a motor end cover 4, a base, a bearing 3 and a junction box 10;
the rotor 7 is arranged on the main shaft; the main shaft is arranged in the base;
bearings 3 are arranged at two ends of the main shaft, and motor end covers 4 are arranged at two ends of the machine base;
a wave-shaped spring piece 2 is arranged between the bearing 3 and the motor end cover 4;
a sealing ring 1 is also arranged between the main shaft and the motor end cover 4;
a fan 9 is installed at one end of the main shaft, a fan cover 8 is arranged outside the fan 9, and the fan cover 8 is fixedly connected with the motor end cover 4 through bolts;
the motor end cover 4, the base, the bearing 3, the junction box 10 and the fan cover 8 are all made of non-magnetic materials;
the engine base is of a cylindrical structure, a support is arranged at the bottom of the engine base, and a plurality of radiating ribs 11 are arranged on the circumference of the outer wall of the engine base; a junction box 10 is also arranged on one side of the base;
in this embodiment, the sectional area of the stator 5 conducting bar is 5.9mm2, and the sectional area of the rotor 7 conducting bar is 140mm 2;
in the embodiment, the length of the end part of the winding is 82mm, and a concentric winding is adopted; the length of the iron core is 160mm, so that the winding loss of the stator 5 and the rotor 7 is reduced;
in this embodiment, the three circles are selected to be phi 270/phi 155/phi 60 mm; the air gap is 0.85 mm; the slot mating is 36/28; stator pear-shaped grooves and rotor knife-shaped grooves;
in the embodiment, the weight of the rotor is selected not to exceed 28kg, and the bearing model is 6309-2 RZ/C3;
the cooling mode is selected as IC411, the non-transmission end shaft is provided with the high-efficiency fan 9, the heat dissipation surface of the base and the like are matched with the heat dissipation performance of the motor, and therefore ventilation loss is reduced.
In this embodiment, one section of the spindle in the base is made of conventional carbon steel materials, and two sections of outer circles of the spindle outside the base are subjected to surfacing welding of stainless steel.
In this embodiment, the motor lead in the junction box 10 is connected to a power supply by a shielded cable.
In this embodiment, seams where the motor end cover 4 is connected with the base, the junction box 10 and the like are all in spigot fit, and are provided with sealant, so that continuity of electromagnetic shielding is ensured.
In this embodiment, the motor end cover 4, the base, the bearing 3, the junction box 10 and the fan housing 8 are all made of 022Cr17Ni12Mo2 austenitic stainless steel.
The embodiment has the following advantages:
1. in the embodiment, an advanced finite element calculation simulation analysis means is adopted to accurately analyze the motor loss, optimize comparison and reasonably select three circles, groove matching, pitch and groove type so as to improve magnetic circuit distribution and reduce stator iron loss;
2. the design of the internal and external air paths of the motor is optimized, the wind resistance is reduced, and the heat dissipation performance of the fan, the heat dissipation surface of the base and the like is matched with that of the motor, so that the ventilation loss is reduced;
3. the implementation reduces the weight of the rotor, and the bearing model selection is reasonably carried out, so that the friction loss of the bearing is reduced;
4. the embodiment reduces the loss of the stator and the rotor winding by measures of increasing the sectional area of the conducting bar, reducing the length of the end part of the winding, reducing the pitch, shortening the length of the iron core and the like;
5. in the embodiment, the total stray loss is reduced by selecting proper groove matching, enlarging an air gap, pickling the rotor chute and the rotor surface, adopting a closed groove and other measures;
6. the motor end cover, the base, the junction box, the fan cover and other parts of the embodiment are all made of non-magnetic austenitic stainless steel 022Cr17Ni12Mo2, and a stainless steel metal shell capable of shielding electromagnetic interference is provided;
7. the main shaft of the embodiment adopts the conventional carbon steel material in the iron core body section, stainless steel is welded on the excircle of the shaft extension sections at two ends, the motor lead adopts a cable with a shielding layer to connect with a power supply, and seams where the motor end cover is connected with the machine base, the junction box and the like are matched by rabbets and are provided with sealant, so that the continuity of electromagnetic shielding is ensured;
8. the high-efficiency three-phase asynchronous motor with the electromagnetic interference resistance is convenient to use, relatively reasonable in cost and capable of meeting the requirement of mass production;
9. the motor of the embodiment has the advantages of simple structure and low operation labor intensity, can be popularized and applied in a large scale by utilizing the existing technologies such as automatic welding, numerical control processing and the like, and can create greater economic benefit and social benefit.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the utility model is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (5)
1. A three-phase asynchronous motor with electromagnetic interference resistance ability, its characterized in that: comprising a stator (5), a rotor (7) and a metal casing, wherein:
the metal shell is formed by welding a motor end cover (4), a machine base, a bearing (3) and a junction box (10);
the rotor (7) is arranged on the main shaft; the main shaft is arranged in the base; bearings (3) are arranged at two ends of the main shaft, and motor end covers (4) are arranged at two ends of the machine base; a wave-shaped spring piece (2) is arranged between the bearing (3) and the motor end cover (4); a sealing ring (1) is arranged between the main shaft and the motor end cover (4); a fan (9) is installed at one end of the main shaft, a fan cover (8) is arranged outside the fan (9), and the fan cover (8) is fixedly connected with the motor end cover (4) through a bolt;
the motor end cover (4), the base, the bearing (3), the junction box (10) and the fan cover (8) are all made of non-magnetic materials;
the engine base is of a cylindrical structure, a support is arranged at the bottom of the engine base, and a plurality of radiating ribs (11) are arranged on the circumference of the outer wall of the engine base; a junction box (10) is also arranged on one side of the base;
the sectional area of the conducting bar of the stator (5) is 5.3-6.5mm 2; the cross section of the guide bar of the rotor (7) is 130-150mm 2;
the length of the end part of the winding is 80-85mm, and a concentric winding is adopted; the length of the iron core is 150-170mm, so that the winding loss of the stator (5) and the rotor (7) is reduced;
selecting three circles as phi 265-275/phi 150-160/phi 55-65 mm; the air gap is not less than 0.85mm, the groove fit is 36/28, and the groove type is selected as follows: stator pear-shaped grooves and rotor knife-shaped grooves;
selecting a rotor weight not to exceed 28 kg;
the cooling mode is selected to be IC411, a fan (9) is arranged on a non-transmission end shaft, and the fan (9) and the heat dissipation surface of the base are matched with the heat dissipation performance of the motor, so that the ventilation loss is reduced.
2. The electromagnetic interference prevention three-phase asynchronous motor of claim 1, wherein: one section of the main shaft, which is positioned in the base, is made of carbon steel materials, and two sections of excircle surfacing stainless steel, which is positioned outside the base, of the main shaft are made of stainless steel.
3. The three-phase asynchronous motor with electromagnetic interference prevention capability of claim 1, wherein: and the motor lead in the junction box (10) is connected with a power supply by a shielded cable.
4. The electromagnetic interference prevention three-phase asynchronous motor of claim 1, wherein: seams where the motor end cover (4) is connected with the base and the junction box (10) are matched by rabbets, and sealant is arranged, so that the continuity of electromagnetic shielding is ensured.
5. The three-phase asynchronous motor with electromagnetic interference prevention capability of claim 1, wherein: the motor end cover (4), the base, the bearing (3), the junction box (10) and the fan cover (8) are all made of 022Cr17Ni12Mo2 austenitic stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122832342.8U CN217010559U (en) | 2021-11-18 | 2021-11-18 | Three-phase asynchronous motor with electromagnetic interference resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122832342.8U CN217010559U (en) | 2021-11-18 | 2021-11-18 | Three-phase asynchronous motor with electromagnetic interference resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217010559U true CN217010559U (en) | 2022-07-19 |
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ID=82381156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122832342.8U Active CN217010559U (en) | 2021-11-18 | 2021-11-18 | Three-phase asynchronous motor with electromagnetic interference resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217010559U (en) |
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2021
- 2021-11-18 CN CN202122832342.8U patent/CN217010559U/en active Active
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