A low-noise DC motor for electric drive systems of new energy vehicles

Abstract

A low-noise DC motor for an electric drive system of a new energy vehicle belongs to the technical field of motors. In order to solve the problem that the existing motors need to be designed and controlled complexly to break through the speed limit of the back electromotive force, the present invention generates a magnetically attracted permanent magnet ring by energizing the second coil. At this time, the permanent magnet ring moves downward, and the connecting rod, the sliding seat, the extrusion plate and the locking mechanism move downward together. The NdFeB magnet moves outward under the action of centrifugal force and the mutual repulsion of the stator coil being energized. After the movement, the air gap increases, the back electromotive force decreases, and the speed can be increased. When encountering a slope or a speed drop controlled by humans, the current direction of the second coil is changed, the permanent magnet ring, the connecting rod, and the sliding seat move upward, and the extrusion plate squeezes the pressure plate inward, so that the pressure plate, the sliding shaft and the NdFeB magnet move inward. At this time, it is in a low speed state and still maintains a high torque state. The structure is simple and the control is easy.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a low-noise DC motor for an electric drive system of a new energy vehicle. Background Art

[0002] Pure electric vehicles are a type of new energy vehicle. They are mainly powered by electricity and are completely powered by rechargeable batteries (such as lithium-ion batteries). They are driven by motors and do not use traditional fuel engines. Pure electric vehicles have the advantages of zero emissions, low noise, and high efficiency. They are one of the current mainstream directions of new energy vehicle development. The core components of pure electric vehicles include batteries, motors, and electronic control systems.

[0003] In conventional motors, the higher the speed of the motor, the higher the back electromotive force it generates, until it reaches a critical point and its speed can no longer be increased. However, plug-in permanent magnet synchronous motors are widely used in existing automobiles. Through advanced control strategies and technologies, the speed of the motor can be significantly increased. For example, the patent with publication number CN108258957A discloses a full-speed range weak magnetic control method for a permanent magnet synchronous motor, calibrating to obtain a three-dimensional table of the motor's maximum torque-speed characteristic curve: calibrating to obtain the working point on the maximum torque-current ratio curve, calibrating to obtain a three-dimensional table of the switching torque-speed characteristic curve: obtaining the maximum torque and switching torque that can be output at the current speed; obtaining the target output torque in this state; and looking up the speed-torque-current table obtained above to obtain the optimal weak magnetic working current in the current state. However, this plug-in permanent magnet synchronous motor has the disadvantages of complex structure and complex control. Summary of the invention

[0004] The purpose of the present invention is to provide a low-noise DC motor for an electric drive system of a new energy vehicle, which solves the problem that the existing motors in the background technology need complex design and complex control to break through the speed limitation of back electromotive force.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: A low-noise DC motor for an electric drive system of a new energy vehicle, comprising a motor housing and a stator assembly and a rotor assembly arranged inside the motor housing, characterized in that: a transmission shaft is rotatably arranged inside the motor housing, the transmission shaft is connected to the rotor assembly, and the transmission shaft extends to the outside of the motor housing, the stator assembly is fixedly arranged inside the motor housing, the rotor assembly is rotatably connected to the motor housing, and the rotor assembly is rotatably arranged on the outer edge of the stator assembly;

[0006] The rotor assembly includes a rotor holder, the inner side of the rotor holder is evenly distributed with sliding grooves, the rotor assembly also includes a neodymium iron boron magnet slidably arranged inside the sliding groove, the inner wall of the motor housing is installed with a magnetic sensor, the magnetic sensor is used to monitor the position of the neodymium iron boron magnet, an electromagnetic coil is fixedly arranged at the lower part of the motor housing, a permanent magnet ring is movably arranged at the lower part of the motor housing, and the permanent magnet ring is located above the electromagnetic coil, the electromagnetic coil is used to control the position of the permanent magnet ring, and the transmission assembly is evenly distributed inside the rotor holder, the transmission assembly is connected to the permanent magnet ring and is used to control the position of the neodymium iron boron magnet;

[0007] The rotor holder is provided with a first movable groove and a second movable groove corresponding to the transmission assembly. The transmission assembly includes a sliding shaft that is laterally slidably connected to the first movable groove, one end of the sliding shaft is fixedly connected to the NdFeB magnet, and the other end of the sliding shaft is fixedly connected to a pressure plate, and the cross-section of the pressure plate is a right-angled trapezoid. The transmission assembly also includes an extrusion plate, a sliding seat and a connecting rod that are longitudinally slidably connected to the second movable groove. The cross-section of the extrusion plate is a right-angled triangle. The extrusion plate, the sliding seat and the connecting rod are fixedly connected in sequence from top to bottom. The bottom of the connecting rod extends to the outside of the rotor holder and is fixedly connected to the permanent magnet ring. The transmission assembly also includes a locking mechanism arranged inside the rotor holder, and the locking mechanism is used to lock the position of the NdFeB magnet.

[0008] Furthermore, a limiting plate is installed on one side of the sliding shaft close to the NdFeB magnet, and a first spring is sleeved on the outside of the sliding shaft, and the first spring is placed between the inner wall of the first movable groove and the limiting plate.

[0009] Furthermore, a second spring is sleeved on the outside of the connecting rod, and the second spring is placed between the bottom of the sliding seat and the inner wall of the second movable groove.

[0010] Furthermore, the locking mechanism includes a fixed seat fixedly mounted on the top of the sliding seat, a sliding block is slidably connected inside the fixed seat, a third spring is arranged between the sliding block and the inner wall of the bottom of the fixed seat, and the locking mechanism also includes a locking plate fixedly connected to the top of the sliding block, and a locking block fixedly connected to the bottom of the pressure plate, wherein the locking plate passes through the fixed seat upward and extends.

[0011] Furthermore, the stator assembly includes a stator holder with wire slots evenly distributed on the stator holder. The stator assembly also includes a stator coil installed in the wire slots. The stator coil is a coil formed by evenly winding enameled wire between two adjacent groups of wire slots.

[0012] Furthermore, a stator fixing base is installed inside the motor housing, and the middle of the top of the stator fixing base is fixedly connected to the stator retaining frame through a connecting shaft. A limiting ring is also provided on the top of the stator fixing base, and two groups of limiting rings are provided. The two groups of limiting rings are used to fix the electromagnetic coil, and the stator fixing base is fixedly connected to the bottom inner wall of the motor housing through a second fixing bolt.

[0013] Furthermore, the electromagnetic coil comprises a mounting frame which is embedded and installed between the limiting rings, the mounting frame is provided with a coil groove, and the second coil is provided in the coil groove.

[0014] Furthermore, the bottom of the transmission shaft is located inside the motor housing, and a fixing plate is fixedly connected to the bottom of the transmission shaft, and the fixing plate is fixedly connected to the top of the rotor holder through a first fixing bolt.

[0015] Furthermore, a boss is provided on the top of the motor housing, and a mounting groove is provided on the top of the boss and the top inner wall of the motor housing. A bearing is embedded in the mounting groove, and the transmission shaft is rotatably connected to the motor housing through the bearing.

[0016] Furthermore, a clamping groove is provided inwardly on the outer edge of the boss, a clamping ring is provided in the clamping groove, and a groove corresponding to the clamping ring is provided on the transmission shaft.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a low-noise DC motor for an electric drive system of a new energy vehicle. When the speed reaches a critical value and needs to be further increased, the second coil is energized to generate a magnetically attracted permanent magnet ring. At this time, the permanent magnet ring moves downward, and the connecting rod, the sliding seat, the extrusion plate and the locking mechanism move downward together. The NdFeB magnet moves outward under the action of centrifugal force and the mutual repulsion of the stator coil being energized. After the movement, the air gap increases, the back electromotive force decreases, and the speed can be increased. When encountering a slope or a speed drop controlled by humans, the current direction of the second coil is changed, the permanent magnet ring, the connecting rod, and the sliding seat move upward, and the extrusion plate presses the pressure plate inward, so that the pressure plate, the sliding shaft and the NdFeB magnet move inward. At this time, the motor is in a low speed state and still maintains a high torque state. The structure is simple and the control is convenient. The motor is controlled by means of an electromagnetic coil, does not contact the rotor, the stator and the NdFeB magnet in the rotor, and has low noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a disassembled diagram of the overall structure of the present invention;

[0021] Figure 3 It is a schematic structural diagram of the stator assembly, rotor assembly, transmission shaft and stator fixing base of the present invention;

[0022] Figure 4 It is an exploded view of the stator assembly, rotor assembly, transmission shaft and stator fixing base structure of the present invention;

[0023] Figure 5 It is an exploded view of the stator assembly structure of the present invention;

[0024] Figure 6 It is an exploded view of the rotor assembly, electromagnetic coil, permanent magnet ring and transmission assembly structure of the present invention;

[0025] Figure 7 It is a cross-sectional view of the rotor assembly, permanent magnet ring and transmission assembly structure of the present invention;

[0026] Figure 8 A cross-sectional view of the rotor assembly structure of the present invention;

[0027] Fig. 9 It is a schematic diagram of the transmission assembly and the NdFeB magnet structure of the present invention;

[0028] Fig.10 It is an exploded view of the transmission assembly structure of the present invention.

[0029] In the figure: 1, motor housing; 11, boss; 111, mounting groove; 112, clamping groove; 2, stator assembly; 21, stator retainer; 22, wire groove; 23, stator coil; 3, rotor assembly; 31, rotor retainer; 32, sliding groove; 33, NdFeB magnet; 34, first movable groove; 35, second movable groove; 4, transmission shaft; 41, fixing plate; 411, first fixing bolt; 42, bearing; 43, clamping ring; 44, magnetic sensor; 5, stator fixing base; 51, connecting shaft ; 52. limit ring; 53. second fixing bolt; 6. electromagnetic coil; 61. mounting bracket; 62. coil slot; 63. second coil; 7. permanent magnet ring; 8. transmission assembly; 81. sliding shaft; 811. limit plate; 812. first spring; 82. pressure plate; 83. connecting rod; 831. second spring; 84. sliding seat; 85. extrusion plate; 86. locking mechanism; 861. fixing seat; 862. sliding block; 863. locking plate; 864. third spring; 865. locking block. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In order to solve the technical problem that the existing motors need complex design and complex control to break through the speed limit of back electromotive force, such as Figure 1-Figure 10 As shown, the following preferred technical solutions are provided:

[0032] A low-noise DC motor for an electric drive system of a new energy vehicle comprises a motor housing 1 and a stator assembly 2 and a rotor assembly 3 arranged inside the motor housing 1. A transmission shaft 4 is rotatably arranged inside the motor housing 1, the transmission shaft 4 is connected to the rotor assembly 3, and the transmission shaft 4 extends to the outside of the motor housing 1. The stator assembly 2 is fixedly arranged inside the motor housing 1, the rotor assembly 3 is rotatably connected to the motor housing 1, and the rotor assembly 3 is rotatably arranged on the outer edge of the stator assembly 2; the rotor assembly 3 comprises a rotor holder 31, the inner side of the rotor holder 31 is evenly distributed with sliding grooves 32, the rotor assembly 3 also comprises a neodymium iron boron magnet 33 slidably arranged inside the sliding groove 32, and the motor housing 1 is provided with a plurality of A magnetic sensor 44 is installed on the inner wall, and the magnetic sensor 44 is used to monitor the position of the NdFeB magnet 33. An electromagnetic coil 6 is also fixedly arranged at the lower part of the motor housing 1. A permanent magnet ring 7 is movably arranged at the lower part of the motor housing 1, and the permanent magnet ring 7 is located above the electromagnetic coil 6. The electromagnetic coil 6 is used to control the position of the permanent magnet ring 7. Transmission components 8 are evenly distributed inside the rotor holder 31. The transmission component 8 is connected to the permanent magnet ring 7 and is used to control the position of the NdFeB magnet 33; the rotor holder 31 is provided with a first movable groove 34 and a second movable groove 35 corresponding to the transmission component 8. The transmission component 8 includes a sliding shaft 81 that is laterally slidably connected to the inside of the first movable groove 34. The sliding shaft 81 is connected to the inside of the first movable groove 34. One end of the moving shaft 81 is fixedly connected to the NdFeB magnet 33, and the other end of the sliding shaft 81 is fixedly connected to a pressure plate 82, and the cross section of the pressure plate 82 is a right-angled trapezoid. The transmission assembly 8 also includes an extrusion plate 85, a sliding seat 84 and a connecting rod 83 longitudinally slidably connected to the inside of the second movable groove 35. The cross section of the extrusion plate 85 is a right-angled triangle. The extrusion plate 85, the sliding seat 84 and the connecting rod 83 are fixedly connected in sequence from top to bottom. The bottom of the connecting rod 83 extends to the outside of the rotor holder 31 and is fixedly connected to the permanent magnet ring 7. The transmission assembly 8 also includes a locking mechanism 86 arranged inside the rotor holder 31, and the locking mechanism 86 is used to lock the position of the NdFeB magnet 33; Rotor assembly When the component 3 is in a rotating state, the NdFeB magnet 33 will be thrown outward. The locking mechanism 86 can prevent the NdFeB magnet 33 from moving outward due to centrifugal force. When high-speed rotation is required, the transmission component 8 controls the permanent magnet ring 7 to move downward, and the locking mechanism 86 unlocks the pressure plate 82. The NdFeB magnet 33 can move outward, and the air gap between the NdFeB magnet 33 and the stator component 2 increases, and the speed is increased. When the speed changes from high to low, the transmission component 8 controls the permanent magnet ring 7 to move upward, and the extrusion plate 85 squeezes the pressure plate 82 upward to reset the NdFeB magnet 33 to the inside. The locking mechanism 86 locks the pressure plate 82 to prevent the NdFeB magnet 33 from moving outward.

[0033] A limiting plate 811 is installed on the side of the sliding shaft 81 close to the NdFeB magnet 33, and a first spring 812 is mounted on the outside of the sliding shaft 81. The first spring 812 is placed between the inner wall of the first movable groove 34 and the limiting plate 811. The function of the first spring 812 is to always keep the NdFeB magnet 33 inwardly close to the outer wall of the stator assembly 2 when there is no external force.

[0034] A second spring 831 is sheathed on the outside of the connecting rod 83, and the second spring 831 is placed between the bottom of the sliding seat 84 and the inner wall of the second movable groove 35. The function of the second spring 831 is to always keep the connecting rod 83, the sliding seat 84 and the extrusion plate 85 generating an upward extrusion force in the absence of external force.

[0035] The locking mechanism 86 includes a fixed seat 861 fixedly installed on the top of the sliding seat 84, and the fixed seat 861 is internally slidably connected with a sliding block 862, and a third spring 864 is arranged between the sliding block 862 and the inner wall at the bottom of the fixed seat 861. The locking mechanism 86 also includes a locking plate 863 fixedly connected to the top of the sliding block 862, and a locking block 865 fixedly connected to the bottom of the pressure plate 82, wherein the locking plate 863 penetrates the fixed seat 861 upward and extends, and when the inner side of the NdFeB magnet 33 is flush with the inner side surface of the rotor holder 31, the locking block 865 under the pressure plate 82 is just located at the inner side of the locking plate 863.

[0036] The stator assembly 2 includes a stator holder 21 on which wire slots 22 are evenly distributed. The stator assembly 2 also includes a stator coil 23 installed in the wire slots 22. The stator coil 23 is a coil formed by evenly winding enameled wire between two adjacent groups of wire slots 22.

[0037] A stator fixing base 5 is installed inside the motor housing 1. The middle of the top of the stator fixing base 5 is fixedly connected to the stator retainer 21 through a connecting shaft 51. A limiting ring 52 is also provided on the top of the stator fixing base 5, and two groups of limiting rings 52 are provided. The two groups of limiting rings 52 are used to fix the electromagnetic coil 6. The stator fixing base 5 is fixedly connected to the bottom inner wall of the motor housing 1 through a second fixing bolt 53.

[0038] The electromagnetic coil 6 includes a mounting frame 61 embedded between the limiting rings 52. The mounting frame 61 is provided with a coil slot 62. A second coil 63 is provided in the coil slot 62. The permanent magnet ring 7 can be moved upward or downward by changing the direction of the current connected to the second coil 63.

[0039] The bottom of the transmission shaft 4 is located inside the motor housing 1 . A fixing plate 41 is fixedly connected to the bottom of the transmission shaft 4 . The fixing plate 41 is fixedly connected to the top of the rotor holder 31 via a first fixing bolt 411 .

[0040] A boss 11 is provided at the top of the motor housing 1, and a mounting groove 111 is provided at the top of the boss 11 and the top inner wall of the motor housing 1. A bearing 42 is embedded and installed in the mounting groove 111. The transmission shaft 4 is rotatably connected to the motor housing 1 through the bearing 42. The transmission shaft 4 is rotatably connected to the motor housing 1 through the bearing 42, and is bolted to the rotor retaining frame 31 through the fixing plate 41, so that the rotor assembly 3 can be rotated outside the stator assembly 2.

[0041] A clamping groove 112 is provided inwardly at the outer edge of the boss 11 , a clamping ring 43 is provided in the clamping groove 112 , and a groove corresponding to the clamping ring 43 is provided on the transmission shaft 4 to prevent the transmission shaft 4 from moving up and down.

[0042] Working principle: When the stator assembly 2 and the rotor assembly 3 are in a state of low-speed rotation, the inner side surface of the NdFeB magnet 33 is attached to the inner side surface of the rotor holder 31. At this time, the distance between the NdFeB magnet 33 and the stator coil 23 is small, and the locking plate 863 can be on the outside of the locking block 865, which can effectively prevent the NdFeB magnet 33 from expanding outward under the action of centrifugal force. At this time, due to the small air gap, a larger torque can be obtained, but the speed cannot continue to break through after it reaches a certain state. When the speed reaches the critical value and needs to be further increased, the second coil 63 is energized to generate magnetic attraction of the permanent magnet ring 7. At this time, the permanent magnet ring 7 moves downward and makes the connecting rod 83, the sliding seat 84, the extrusion plate 85 and the locking mechanism 86 move downward together. At this time, the pressure plate 82 is not locked by the locking mechanism 86, and the NdFeB magnet 33 moves outward under the action of centrifugal force and the mutual repulsion of the stator coil 23 being energized. After moving, the air gap increases. The back electromotive force is reduced, and the rotation speed can be increased. When encountering climbing or artificially controlled speed reduction, the current direction of the second coil 63 is changed, the permanent magnet ring 7, the connecting rod 83, and the sliding seat 84 move upward, and the extrusion plate 85 squeezes the pressure plate 82 inward, so that the pressure plate 82, the sliding shaft 81 and the NdFeB magnet 33 move inward. During this process, the locking plate 863 will contact the bottom of the locking block 865, so that the third spring 864 is in a compressed state. When the locking block 865 moves to the inner position of the locking plate 863, the third spring 864 pops out the locking plate 863 to lock the locking block 865. At this time, under the action of the second spring 831 and the first spring 812, even if the second coil 63 is no longer energized, the NdFeB magnet 33 will not be displaced. The second coil 63 is only used in three states: high-speed rotation, transition from low speed to high speed, or transition from high speed to low speed, and is not used in the low-speed state, which is easy to control.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low-noise DC motor for an electric drive system of a new energy vehicle, comprising a motor housing (1) and a stator assembly (2) and a rotor assembly (3) arranged inside the motor housing (1), characterized in that: A transmission shaft (4) is rotatably arranged inside the motor housing (1), the transmission shaft (4) is connected to the rotor assembly (3), and the transmission shaft (4) extends to the outside of the motor housing (1); the stator assembly (2) is fixedly arranged inside the motor housing (1), the rotor assembly (3) is rotatably connected to the motor housing (1), and the rotor assembly (3) is rotatably arranged on the outer edge of the stator assembly (2); the rotor assembly (3) comprises a rotor holder (31), the inner side of the rotor holder (31) is evenly distributed with sliding grooves (32), and the rotor assembly (3) also comprises a sliding groove (32) slidably arranged in the sliding groove ( The motor housing (1) is provided with a magnetic sensor (44) on the inner wall thereof, and the magnetic sensor (44) is used to monitor the position of the neodymium iron boron magnet (33). An electromagnetic coil (6) is fixedly arranged at the lower part of the motor housing (1). A permanent magnet ring (7) is movably arranged at the lower part of the motor housing (1), and the permanent magnet ring (7) is located above the electromagnetic coil (6). The electromagnetic coil (6) is used to control the position of the permanent magnet ring (7). Transmission components (8) are evenly distributed inside the rotor holder (31). The transmission components (8) are arranged on the upper part of the rotor holder (31). ) is connected to the permanent magnet ring (7) and is used to control the position of the NdFeB magnet (33); the rotor holder (31) is provided with a first movable groove (34) and a second movable groove (35) corresponding to the transmission component (8); the transmission component (8) includes a sliding shaft (81) which is laterally slidably connected to the first movable groove (34); one end of the sliding shaft (81) is fixedly connected to the NdFeB magnet (33); the other end of the sliding shaft (81) is fixedly connected to a pressure plate (82); and the cross section of the pressure plate (82) is a right-angled trapezoid; the transmission component (8) also includes a longitudinal An extrusion plate (85), a sliding seat (84) and a connecting rod (83) are slidably connected inside the second movable groove (35); the cross section of the extrusion plate (85) is a right triangle; the extrusion plate (85), the sliding seat (84) and the connecting rod (83) are fixedly connected in sequence from top to bottom; the bottom of the connecting rod (83) extends to the outside of the rotor holder (31) and is fixedly connected to the permanent magnet ring (7); the transmission assembly (8) further includes a locking mechanism (86) arranged inside the rotor holder (31); the locking mechanism (86) is used to lock the position of the neodymium iron boron magnet (33).

2. A low-noise DC motor for a new energy vehicle electric drive system as claimed in claim 1, characterized in that: A limiting plate (811) is installed on one side of the sliding shaft (81) close to the NdFeB magnet (33), and a first spring (812) is sleeved on the outside of the sliding shaft (81), the first spring (812) being disposed between the inner wall of the first movable groove (34) and the limiting plate (811).

3. A low-noise DC motor for a new energy vehicle electric drive system as claimed in claim 1, characterized in that: A second spring (831) is sleeved on the outside of the connecting rod (83), and the second spring (831) is placed between the bottom of the sliding seat (84) and the inner wall of the second movable groove (35).

4. A low-noise DC motor for a new energy vehicle electric drive system as claimed in claim 1, characterized in that: The locking mechanism (86) comprises a fixed seat (861) fixedly mounted on the top of the sliding seat (84); a sliding block (862) is slidably connected inside the fixed seat (861); a third spring (864) is provided between the sliding block (862) and the inner wall of the bottom of the fixed seat (861); the locking mechanism (86) further comprises a locking plate (863) fixedly connected to the top of the sliding block (862); and a locking block (865) fixedly connected to the bottom of the pressure plate (82); wherein the locking plate (863) passes through the fixed seat (861) and extends upward.

5. A low-noise DC motor for a new energy vehicle electric drive system as claimed in claim 1, characterized in that: The stator assembly (2) comprises a stator retainer (21), on which wire slots (22) are evenly distributed. The stator assembly (2) further comprises a stator coil (23) installed in the wire slots (22), and the stator coil (23) is a coil formed by evenly winding enameled wires between two adjacent groups of wire slots (22).

6. A low-noise DC motor for a new energy vehicle electric drive system as claimed in claim 5, characterized in that: A stator fixing base (5) is installed inside the motor housing (1); the middle of the top of the stator fixing base (5) is fixedly connected to the stator retaining frame (21) via a connecting shaft (51); a limiting ring (52) is also provided on the top of the stator fixing base (5), and two groups of limiting rings (52) are provided. The two groups of limiting rings (52) are used to fix the electromagnetic coil (6); the stator fixing base (5) is fixedly connected to the bottom inner wall of the motor housing (1) via a second fixing bolt (53).

7. A low-noise DC motor for a new energy vehicle electric drive system as claimed in claim 6, characterized in that: The electromagnetic coil (6) comprises a mounting frame (61) mounted between the limiting rings (52), the mounting frame (61) being provided with a coil slot (62), and a second coil (63) being provided in the coil slot (62).

8. A low-noise DC motor for a new energy vehicle electric drive system as claimed in claim 1, characterized in that: The bottom of the transmission shaft (4) is located inside the motor housing (1), and a fixing plate (41) is fixedly connected to the bottom of the transmission shaft (4), and the fixing plate (41) is fixedly connected to the top of the rotor retaining frame (31) via a first fixing bolt (411).

9. A low-noise DC motor for a new energy vehicle electric drive system as claimed in claim 8, characterized in that: A boss (11) is provided at the top of the motor housing (1), a mounting groove (111) is provided at the top of the boss (11) and the top inner wall of the motor housing (1), a bearing (42) is embedded in the mounting groove (111), and the transmission shaft (4) is rotatably connected to the motor housing (1) via the bearing (42).

10. A low-noise DC motor for a new energy vehicle electric drive system as claimed in claim 9, characterized in that: A clamping groove (112) is provided inwardly on the outer edge of the boss (11), a clamping ring (43) is provided in the clamping groove (112), and a groove corresponding to the clamping ring (43) is provided on the transmission shaft (4).

Images