Low-voltage high-capacity motor

Abstract

The motor comprises a rotor and a stator sleeved on the periphery of the rotor, the rotor comprises a rotor iron core and a rotor punching sheet groove arranged on the rotor iron core, the rotor punching sheet groove comprises a top groove and a bottom groove which are communicated with each other, the top groove is arranged in the bottom groove and extends towards the direction of the stator, and the bottom groove is arranged in the bottom groove and extends towards the direction of the stator. The end, facing the stator, of the rotor iron core is provided with a sealing part used for sealing the top groove so that a gap can exist between the top groove and the periphery of the rotor iron core, and the bottom groove comprises a first groove body of a semicircular structure and a second groove body extending towards the top groove along the semicircular end of the first groove body in a flaring shape. The top groove comprises a third groove body which radially extends in the middle of one side, facing the stator, of the second groove body, and a fourth groove body which is located at one end, facing the stator, of the top groove and is of a semicircular structure. The whole rotor punching sheet groove is a round-bottom groove with a narrow upper part and a wide lower part, so that the distribution of an electromagnetic field is improved, the area of the rotor groove is increased while the starting current is reduced, and the motor efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially a kind of low-voltage large-capacity motor. BACKGROUND

[0002] Petroleum chemical equipment is more and more high in technical reformation, capacity improvement, explosion-proof safety, energy saving and consumption reduction and automatic control, and the capacity requirement of motor is more and more big, and the capacity of low-voltage motor also has upward development trend due to the progress of electric control element and electric power cable, the capacity demand of motor is more and more big, but the slot type design in existing low-voltage large-capacity cannot effectively optimize electromagnetic field distribution, leading to the poor electromagnetic performance of motor, so that motor efficiency is low.

[0003] Therefore, how to avoid the influence of low motor efficiency is the technical problem that the present technical personnel in the field need to solve. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of low-voltage large-capacity motor, can increase rotor slot area while reducing starting current, make the current enough big that allow to pass, improve motor efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides a kind of low-voltage large-capacity motor, motor includes rotor, stator that is sleeved in the outer periphery of rotor, rotor includes rotor core, the rotor lamination slot of being arranged in rotor core, rotor lamination slot includes the top slot and the bottom slot that are connected, top slot is opened in the middle of bottom slot towards stator side and extends towards stator direction, the end of rotor core towards stator is equipped with the sealing portion for closing top slot, to make the interval between top slot and the outer periphery of rotor core, bottom slot includes the first slot body of semicircular structure, the second slot body that is flared and extends along the semicircular end portion of first slot body towards top slot, top slot includes the third slot body that extends radially in the middle of second slot body towards stator side and the fourth slot body that is semicircular structure and is located in the end of top slot towards stator.

[0006] Preferably, the rotor further includes a rotor end plate assembled to both sides of the rotor core in the axial direction after being laminated, the rotor end plate is provided with an end plate slot corresponding to the rotor lamination slot, the cross-sectional dimension of the end plate slot perpendicular to the rotor axial direction is greater than the cross-sectional dimension of the rotor lamination slot perpendicular to the rotor axial direction, and the distance between the inner wall of the end plate slot and the inner wall of the rotor lamination slot is greater than 0.5 mm.

[0007] Preferably, the stator includes a stator core and a stator lamination slot arranged on the stator core, the stator lamination slot is a slant shoulder round bottom slot including a slot opening with a smaller cross-sectional dimension perpendicular to the stator axial direction and a slot bottom with a larger cross-sectional dimension perpendicular to the stator axial direction.

[0008] Preferably, the stator further comprises a stator winding, the stator winding adopts polyimide enameled copper round wire, the polyimide enameled copper round wire is wound into an equal-turn coil with 5 turns by a winding die, and is wound in a double-layer overlapping manner in the stator lamination slot.

[0009] Preferably, the rotor core is provided with an axially extending ventilation groove, the ventilation groove is uniformly arranged along the circumferential direction of the rotor core, the ventilation groove is isolated from the rotor lamination slot, and the ventilation groove is located on the side of the bottom groove away from the top groove.

[0010] Preferably, the motor further comprises a cooling assembly, a housing sleeved on the outside of the stator, and a rotating shaft connected to the rotor, the motor comprises a first end for the rotating shaft to extend out and a second end away from the first end, and the cooling assembly comprises:

[0011] a first fan assembled on the second end, the first fan being rotatable for flowing gas from the second end to the first end through the gap between the cooling fins on the outer wall of the housing;

[0012] an inner circulation air inlet arranged on the outer periphery of the housing for flowing part of the gas flowing to the first end to the inner cavity of the housing;

[0013] a second fan sleeved on the rotating shaft and located on the side of the rotor away from the first end, the second fan being rotatable for flowing the gas entering the inner cavity along the inner circulation air inlet through the ventilation groove to the inner circulation air outlet after penetrating the rotor.

[0014] Preferably, the cooling assembly further comprises a wind guide, the wind guide is arranged between the rotor and the second fan, the wind guide is provided with an air duct corresponding to the ventilation groove for the gas flowing along the ventilation groove to enter the inlet of the second fan through the air duct, and the outer wall of the wind guide extends to the outer periphery of the second fan.

[0015] Preferably, the diameter of the first groove body is 7.3-7.8 mm.

[0016] Preferably, the inclined angle of the notch is 31-33°, the width of the notch is 3.7-3.9 mm, and the diameter of the groove bottom is 15.4-15.8 mm.

[0017] Preferably, the skew degree of the rotor core is 1.1-1.3 tooth pitches of the stator core.

[0018] With respect to the above background, the low-voltage large-capacity motor provided by the utility model, the motor comprises a rotor, a stator sleeved on the outer periphery of the rotor, the rotor comprises a rotor core and a rotor punching piece slot arranged on the rotor core, the rotor punching piece slot comprises a top slot and a bottom slot in communication, the top slot is arranged in the middle of the bottom slot towards the stator and extends towards the stator, one end of the rotor core towards the stator is provided with a sealing portion for sealing the top slot, so that there is a gap between the top slot and the outer periphery of the rotor core, the bottom slot comprises a first slot body in a semicircular structure, a second slot body extending in a flared manner from the semicircular end of the first slot body towards the top slot, the top slot comprises a third slot body extending radially in the middle of the side of the second slot body towards the stator and a fourth slot body in a semicircular structure at one end of the top slot towards the stator.

[0019] Specifically, the rotor punching piece slot is designed to comprise a top slot and a bottom slot, the top slot is arranged in the middle of the bottom slot towards the stator and extends towards the stator, the rotor punching piece slot is designed to be in a circumferential non-opening state through the sealing portion, the bottom slot comprises the first slot body and the second slot body, and the top slot comprises the third slot body and the fourth slot body, so that the overall rotor punching piece slot is a round bottom slot with a narrow top and a wide bottom, which helps to improve the distribution of the electromagnetic field, so that the electromagnetic performance of the motor is more stable and efficient, the rotor slot area is increased while the starting current is reduced, the aluminum strip resistance is reduced, the current allowed to pass is large enough, the rotor loss is reduced, and the motor efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only embodiments of the utility model, and those skilled in the art can obtain other drawings according to the provided drawings without creating labor.

[0021] Figure 1 The structure diagram of the rotor core provided by the embodiments of the utility model is shown in the figure.

[0022] Figure 2 The structure diagram of the rotor punching piece slot provided by the embodiments of the utility model is shown in the figure.

[0023] Figure 3 The structure diagram of the rotor end plate provided by the embodiments of the utility model is shown in the figure.

[0024] Figure 4 The structure diagram of the end plate slot and the rotor punching piece slot provided by the embodiments of the utility model is shown in the figure.

[0025] Figure 5 The structure diagram of the stator core provided by the embodiments of the utility model is shown in the figure.

[0026] Figure 6 A structure schematic view of the stator lamination slot provided by the embodiment of the utility model;

[0027] Figure 7 A structure schematic view of the stator end plate provided by the embodiment of the utility model;

[0028] Figure 8 A structure schematic view of the opening and the stator lamination slot provided by the embodiment of the utility model;

[0029] Figure 9 A structure schematic view of the rotor and the stator provided by the embodiment of the utility model;

[0030] Figure 10 A structure schematic view of the rotor and the stator with winding provided by the embodiment of the utility model;

[0031] Figure 11 A structure schematic view of the stator winding provided by the embodiment of the utility model;

[0032] Figure 12 A structure schematic view of the stator lamination slot assembling the stator winding provided by the embodiment of the utility model;

[0033] Figure 13 A structure schematic view of the air duct provided by the embodiment of the utility model;

[0034] Figure 14 A structure sectional view of the air duct provided by the embodiment of the utility model;

[0035] Figure 15 A structure sectional view of the second fan provided by the embodiment of the utility model;

[0036] Figure 16 A structure sectional view of the air cooling assembly provided by the embodiment of the utility model.

[0037] Wherein:

[0038] 100-rotor, 110-rotor core, 111-sealing part, 112-ventilation groove, 120-rotor lamination slot, 121-top groove, 1211-third groove body, 1212-fourth groove body, 122-bottom groove, 1221-first groove body, 1222-second groove body, 130-rotor end plate, 131-end plate groove;

[0039] 200-stator, 210-stator core, 220-stator lamination slot, 221-slot opening, 222-slot bottom, 223-insulating paper, 224-glass cloth, 230-stator winding, 240-stator end plate, 241-opening;

[0040] 310 - first fan, 320 - inner circulation air inlet, 330 - second fan, 340 - air duct, 341 - air duct;

[0041] 400 - machine shell;

[0042] 500 - rotating shaft. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0044] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0045] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "top" and "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the position or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0046] The purpose of the present application is to provide a low-voltage large-capacity motor, which can increase the rotor slot area while reducing the starting current, so that the allowable current is large enough to improve the efficiency of the motor.

[0047] Please refer to Figure 1To achieve the above object, the utility model provides a low -voltage large capacity motor, motor includes rotor 100, the stator 200 of the sleeve set in the outer periphery of rotor 100, rotor 100 includes rotor core 110, the rotor lamination slot 120 of setting in rotor core 110, rotor lamination slot 120 includes the top groove 121 and bottom groove 122 of intercommunication, top groove 121 is set in bottom groove 122 and is towards the middle part of stator 200 one side and extends towards stator 200 direction, the one end of rotor core 110 towards stator 200 is equipped with the sealing part 111 for closing top groove 121, to make top groove 121 and the interval between the outer periphery of rotor core 110, bottom groove 122 includes the first groove body 1221 of semicircular structure, the second groove body 1222 of flared extension along the semicircular end of first groove body 1221 towards top groove 121, top groove 121 includes the third groove body 1211 of radial extension in the middle part of second groove body 1222 towards stator 200 side and the fourth groove body 1212 of semicircular structure in the one end of top groove 121 towards stator 200.

[0048] Please refer to Figure 2 It can be understood that rotor lamination slot 120 includes first groove body 1221, second groove body 1222, third groove body 1211 and fourth groove body 1212 from inside to outside, wherein the diameter L6 of first groove body 1221 is 7.3mm-7.8mm, and preferably 7.5mm, the width of second groove body 1222 and first groove body 1221 is equal to the diameter of first groove body 1221, and is also preferably 7.5mm, second groove body 1222 extends towards top groove 121 in flared shape, that is, the width L4 of one end of second groove body 1222 close to third groove body 1211 is greater than the diameter L6 of first groove body 1221, and at the same time, the width of third groove body 1211 and the diameter L1 of fourth groove body 1212 can be set to 0.4-0.6 times of L4, the length L5 of second groove body 1222 is greater than 1.5 times of the length L3 of third groove body 1211, so that top groove 121 is set to be narrower, and bottom groove 122 is set to be wider, and the specific size of the distance L2 between fourth groove body 1212 and the outer periphery of rotor core 110, the length L5 of second groove body 1222 and the length L3 of third groove body 1211 can be adjusted according to actual conditions, which can achieve the above object.

[0049] The rotor lamination slot 120 is designed to include a top slot 121 and a bottom slot 122, the top slot 121 is opened in the middle of the bottom slot 122 towards the stator 200 side and extends towards the stator 200 direction, the rotor lamination slot 120 is designed to be circumferentially without opening state through the sealing part 111, the bottom slot 122 includes the above-mentioned first slot body 1221 and the second slot body 1222, and the top slot 121 includes the above-mentioned third slot body 1211 and the fourth slot body 1212, so that the rotor lamination slot 120 as a whole is a round bottom slot with narrow top and wide bottom, which helps to improve the distribution of electromagnetic field, so that the electromagnetic performance of the motor is more stable and efficient, while reducing the starting current (meeting the requirement of not more than 7 times the rated current), increasing the rotor slot area, reducing the aluminum strip resistance, allowing the current to be large enough, reducing the rotor 100 loss, and improving the motor efficiency.

[0050] Please refer to Figure 5 and Figure 6 In one embodiment, the stator 200 includes a stator core 210, a stator lamination slot 220 provided on the stator core 210, the stator lamination slot 220 is a slant shoulder round bottom, the slant shoulder round bottom slot includes a slot opening 221 with a smaller cross-sectional dimension perpendicular to the axial direction of the stator 200 and a slot bottom 222 with a larger cross-sectional dimension perpendicular to the axial direction of the stator 200, the oblique angle W of the slot opening 221 is 31°-33°, preferably 32°, the width S5 of the slot opening 221 is 3.7mm-3.9mm, preferably 3.8mm, the diameter S1 of the slot bottom 222 is 15.4mm-15.8mm, preferably 15.6mm, the width S3 of the slant shoulder bottom, the length S4 of the slot opening 221 (i.e. the length of the slant shoulder top from the inner circle of the stator core 210), and the distance S2 between the slant shoulder bottom and the slot bottom 222 can be adjusted according to actual needs, through the design of small slot opening 221 and large slot bottom 222, the starting performance can be improved and the starting current can be reduced.

[0051] Please refer to Figure 7 and Figure 8 In one embodiment, the stator 200 further includes a stator end plate 240, the stator end plate 240 is provided on both sides of the axial direction of the stator 200, the stator end plate 240 is provided with an opening 241 corresponding to the stator lamination slot 220, the cross-sectional dimension of the opening 241 perpendicular to the axial direction of the stator 200 is greater than the cross-sectional dimension of the stator lamination slot 220 perpendicular to the axial direction of the rotor 100, and the distance between the inner wall of the opening 241 and the inner wall of the stator lamination slot 220 is greater than 0.5mm; please refer to Figure 3 and Figure 4The rotor 100 further comprises rotor end plates 130 assembled on both sides of the laminated rotor core 110 in the axial direction, and end plate slots 131 are formed on the rotor end plates 130 corresponding to the rotor lamination slots 120. The cross-sectional dimension of the end plate slots 131 perpendicular to the axial direction of the rotor 100 is greater than the cross-sectional dimension of the rotor lamination slots 120 perpendicular to the axial direction of the rotor 100, and the distance L7 between the inner wall of the end plate slots 131 and the inner wall of the rotor lamination slots 120 is greater than 0.5 mm, preventing the rotor lamination slots 120 from being shielded. Figure 9 and Figure 10 The skew degree of the rotor core 110 is 1.1-1.3 tooth pitches of the stator core 210, and preferably the skew degree of the rotor core 110 is 1.2 tooth pitches of the stator core 210, i.e. the rotor core 110 is skewed by 1.2 stator lamination slots 220 during lamination, which can reduce the influence of cogging torque on motor efficiency. The rotor core 110 is provided with the above-mentioned rotor end plates 130 at both ends, which can prevent the core spring from being damaged during the shafting process.

[0052] Please refer to Figure 11 and Figure 12 In one embodiment, the stator 200 further comprises a stator winding 230. The stator winding 230 is made of polyimide enameled copper round wire, and the polyimide enameled copper round wire is wound into an equal-turn coil with 5 turns by a winding die. Specifically, the electromagnetic wire is made of polyimide enameled copper round wire with a thermal level of 220 and a paint film thickness of level 3. The electromagnetic wire is wound into an equal-turn coil with 5 turns by a winding die, and the straight side length S6 of the coil is preferably 70 mm greater than the thickness of the stator core 210 in the circumferential direction of the stator 200. The stator winding 230 is wound in a double-layer overlapping manner in the stator lamination slots 220, i.e. the stator winding 230 is wound in a double-layer overlapping manner, an insulating paper 223 is placed in the stator lamination slots 220, the insulating paper 223 is one layer of 0.1-thick polyimide film plus two layers of 0.23-thick TFT composite material, the number of conductors in the upper and lower layers in the stator lamination slots 220 is equal, and a bismaleimide laminated glass cloth 224 is inserted at the unsealed end of the stator lamination slots 220. After the end of the winding is shaped, a polyester short fiber textile belt is used to semi-overlap a layer, the width is 1 / 2~2 / 3 of the end, the outer circle of the end is tightly packed with non-woven binding tape for 2~3 layers, and then a polyester short fiber textile belt is used to tightly pack 2 layers, the width is 1 / 2 of the end.

[0053] In the present application, the motor with the stator core 210, the stator lamination slot 220, the rotor core 110 and the rotor lamination slot 120 is optimized in electromagnetic and structure, and the specification power motor of the 4-pole, 800kW low-voltage large-capacity motor meeting the 2nd level energy efficiency specified in GB18163-2020 is compressed from H450 center height to H400 center height, the motor weight is reduced (under the same conditions, the motor weight is reduced by 20%), and the capacity demand for the motor in the market is increasing, and the center height is required to be continuously reduced; the type of random winding is adopted, which has the advantages of high power density, low cost (under the same conditions, the cost is reduced by 20%), simple structure, low starting current, etc., effectively reduces the manufacturing cost of the motor, and solves the problem that the 4-pole, 800kW low-voltage large-capacity motor meeting the 2nd level energy efficiency specified in GB18163-2020 can only be made to H450 center height and the cost is often high due to the use of the formed winding structure.

[0054] Please refer to Figure 15 and Figure 16 In one embodiment, the rotor core 110 is provided with an axially extending ventilation groove 112, the ventilation groove 112 is uniformly arranged along the circumferential direction of the rotor core 110, the ventilation groove 112 is isolated from the rotor lamination slot 120, and the ventilation groove 112 is located on the side of the bottom groove 122 away from the top groove 121, and the rotor end plate 130 also has a through hole corresponding to the ventilation groove 112 to avoid shielding the ventilation groove 112, the motor is also provided with a forced air cooling assembly, a machine shell 400 sleeved outside the stator 200, and a rotating shaft 500 connected to the rotor 100, the motor includes a first end for the rotating shaft 500 to extend out and a second end away from the first end, the forced air cooling assembly includes a first fan 310, an inner circulation air inlet 320 and a second fan 330, the first fan 310 is assembled at the second end, and the first fan 310 can rotate to allow gas to flow from the second end to the first end through the cooling fin gap of the outer wall of the machine shell 400; the inner circulation air inlet 320 is arranged on the outer periphery of the machine shell 400, and is used for allowing part of the gas flowing to the first end to flow to the inner cavity of the machine shell 400; the second fan 330 is sleeved on the rotating shaft 500 and located on the side of the rotor 100 away from the first end, and the second fan 330 can rotate to allow the gas entering the inner cavity through the inner circulation air inlet 320 to pass through the rotor 100 along the ventilation groove 112 and then be discharged through the inner circulation air outlet.

[0055] It can be understood that the motor includes an external air path and an internal air path. Specifically, the external air path is that cooling air enters from the side of the air baffle of the motor, passes through the end cover window and the first fan 310, reaches the gap between the heat dissipation ribs on the outer surface of the casing 400, and is finally blown from the second end to the first end (the shaft extension end) along the gap between the heat dissipation ribs. The internal air path is that a second fan 330 is additionally arranged inside the casing 400 and is sleeved on the rotating shaft 500 and located on the side of the rotor 100 away from the first end. After the rotating shaft 500 of the motor rotates, a pressure difference is generated inside and outside the second fan 330. A low-pressure area is formed at the inlet of the second fan 330, and a high-pressure area is formed at the outlet of the second fan 330. Thus, a negative pressure environment is formed in the ventilation groove 112, and the gas flowing along the axial direction to the inner circulation air inlet 320 enters the cavity and flows along the ventilation groove 112 to the second fan 330. After the gas passes through the inner circulation air outlet on the casing 400 and communicates with the outlet of the second fan 330, the circulating air suction path is formed.

[0056] In addition, please refer to Figure 13 and Figure 14 The air-cooled assembly further includes a wind guide cylinder 340 arranged between the rotor 100 and the second fan 330. The wind guide cylinder 340 is provided with an air duct 341 corresponding to the ventilation groove 112, for the gas flowing along the ventilation groove 112 to enter the inlet of the second fan 330 through the air duct 341. The outer wall of the wind guide cylinder 340 extends to the outer periphery of the second fan 330, so as to avoid radial loss of the gas flowing out of the ventilation groove 112 and improve the heat dissipation effect of the internal air path.

[0057] It should be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply any actual relationship or order between the entities.

[0058] The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The principle and implementation mode of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, the present application can be improved and modified in several ways. These improvements and modifications also fall within the protection scope of the present application.

Claims

1. A low-voltage high-capacity motor, the motor comprising a rotor (100), a stator (200) sleeved on the outer periphery of the rotor (100), the rotor (100) comprising a rotor core (110) and a rotor lamination slot (120) provided on the rotor core (110), characterized in that, The rotor lamination slot (120) comprises a top slot (121) and a bottom slot (122) in communication, the top slot (121) is opened in the middle of the bottom slot (122) towards the stator side and extends towards the stator direction, the rotor core (110) is provided with a sealing portion (111) at one end towards the stator for sealing the top slot (121), so that there is a gap between the top slot (121) and the outer circumference of the rotor core (110), the bottom slot (122) comprises a first slot body (1221) in a semicircular structure, a second slot body (1222) extending in a flared manner along the semicircular end of the first slot body (1221) towards the top slot (121), the top slot (121) comprises a third slot body (1211) extending radially in the middle of the second slot body (1222) towards the stator, and a fourth slot body (1212) in a semicircular structure at one end of the top slot (121) towards the stator.

2. The low-voltage high-capacity motor according to claim 1, characterized in that, The rotor (100) further comprises a rotor end plate (130) assembled on both sides of the rotor core (110) after being laminated, the rotor end plate (130) is provided with an end plate slot (131) corresponding to the rotor lamination slot (120), the cross-sectional dimension of the end plate slot (131) perpendicular to the rotor axial direction is greater than the cross-sectional dimension of the rotor lamination slot (120) perpendicular to the rotor axial direction, and the distance between the inner wall of the end plate slot (131) and the inner wall of the rotor lamination slot (120) is greater than 0.5mm.

3. The low-voltage high-capacity motor according to claim 1, characterized in that, The stator (200) comprises a stator core (210) and a stator lamination slot (220) provided on the stator core (210), the stator lamination slot (220) comprises an inclined shoulder round bottom slot (122), the inclined shoulder round bottom slot (122) comprises a slot opening (221) with a smaller cross-sectional dimension perpendicular to the stator (200) axial direction and a slot bottom (222) with a larger cross-sectional dimension perpendicular to the stator (200) axial direction.

4. The low-voltage high-capacity motor according to claim 3, wherein The stator (200) further comprises a stator winding (230), the stator winding (230) adopts polyimide enameled copper round wire, the polyimide enameled copper round wire is wound into an equal-turn coil with 5 turns by a winding die, and is wound in a double-layer overlapping manner in the stator lamination slot (220).

5. The low-voltage high-capacity motor according to claim 3, wherein The rotor core (110) is provided with an axially extending ventilation slot (112), the ventilation slot (112) is uniformly arranged along the circumferential direction of the rotor core (110), the ventilation slot (112) is isolated from the rotor lamination slot (120), and the ventilation slot (112) is located on the side of the bottom slot (122) away from the top slot (121).

6. The low-voltage high-capacity motor according to claim 5, wherein The motor further comprises a wind cooling assembly, a machine shell (400) sleeved on the outside of the stator (200), and a rotating shaft (500) connected to the rotor (100), the motor comprises a first end for the rotating shaft (500) to extend out and a second end away from the first end, and the wind cooling assembly comprises: A first fan (310) is assembled at the second end, and the first fan (310) is rotatable for air flowing from the second end to the first end along the fin gaps of the outer wall of the casing (400); An inner circulation air inlet (320) is formed on the outer periphery of the casing (400) for part of the air flowing to the first end to flow to the inner cavity of the casing (400); A second fan (330) is sleeved on the rotating shaft (500) and located at the side of the rotor (100) away from the first end, and the second fan (330) is rotatable for the air entering the inner cavity along the inner circulation air inlet (320) to flow along the ventilation groove (112) through the rotor and then to be discharged along the inner circulation air outlet.

7. The low-voltage high-capacity motor according to claim 6, characterized in that, The air cooling assembly further comprises a wind guide cylinder (340) arranged between the rotor (100) and the second fan (330), and the wind guide cylinder (340) is provided with an air duct (341) corresponding to the ventilation groove (112) for the air flowing along the ventilation groove (112) to enter the inlet of the second fan (330) through the air duct (341), and the outer wall of the wind guide cylinder (340) extends to the outer periphery of the second fan (330).

8. A low voltage high capacity electric machine according to any of claims 3-7, characterized in that The diameter of the first groove body (1221) is 7.3-7.8 mm.

9. A low voltage high capacity electric machine according to any of claims 3-7, characterized in that The inclined angle of the notch (221) is 31-33°, the width of the notch (221) is 3.7-3.9 mm, and the diameter of the groove bottom (222) is 15.4-15.8 mm.

10. A low voltage high capacity electric machine according to any of claims 3-7, characterized in that The skew slot degree of the rotor core (110) is 1.1-1.3 tooth pitch of the stator core (210).

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