Motor

Abstract

Embodiments of the present application provide a motor. The motor comprises a base, a first end cover, a second end cover, a stator assembly and a rotor assembly. The first end cover is arranged at one end of the base and is connected to the base; the second end cover is arranged at the other end of the base and is connected to the base; the stator assembly is arranged in the base and is connected to the base; the rotor assembly is provided with first cooling channels extending in the axial direction, and the rotor assembly is arranged in the base and is separately rotatably connected to the first end cover and the second end cover; the rotor assembly, the base and the first end cover define a first containing cavity, the rotor assembly, the base and the second end cover define a second containing cavity, and the first cooling channels make the first containing cavity communicated with the second containing cavity to form an internal cooling channel. According to the motor of the embodiments of the present application, a cooling medium takes, along the internal cooling channel, away heat generated by the rotor assembly, solving the problem that efficient heat dissipation cannot be achieved in a rotor, improving the heat dissipation rate of the motor.

Description

A motor

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311187308.7 and application date September 14, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the technical field of motors, and in particular to a motor. Background Art

[0004] Permanent magnet synchronous motors are devices that use the principle of electromagnetic induction to convert electrical energy into mechanical energy. They efficiently utilize existing engineering materials to reduce losses in the motor during energy conversion and dissipate the heat generated by the losses with a simple structure and at the lowest cost. This is the mainstream direction of motor design today.

[0005] In related technologies, permanent magnet synchronous motors usually use water cooling or air cooling to meet their cooling needs, but the cooling medium usually cannot enter the interior of the motor, and the heat generated by its rotor assembly cannot be dissipated efficiently, reducing the service life of the motor.

[0006] Summary of the Invention

[0007] An embodiment of the present application proposes a motor to solve the problems raised in the above background technology.

[0008] In order to achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0009] A motor, comprising:

[0010] base;

[0011] A first end cover is provided at one end of the machine base and connected to the machine base;

[0012] a second end cover, disposed at the other end of the base and connected to the base;

[0013] A stator assembly is disposed in the base and connected to the base;

[0014] a rotor assembly having a first cooling channel extending in an axial direction, wherein the rotor assembly is disposed in the base and rotatably connected to the first end cover and the second end cover respectively; and

[0015] The rotor assembly, the machine base and the first end cover form a first accommodating cavity, the rotor assembly, the machine base and the second end cover form a second accommodating cavity, and the first cooling channel connects the first accommodating cavity and the second accommodating cavity to form an internal cooling channel.

[0016] In some embodiments, there are multiple first cooling channels, which are divided into two groups and arranged on the rotor assembly. One group of first cooling channels is arranged at intervals on the first circumference of the rotor assembly, and the other group of first cooling channels is arranged at intervals on the second circumference of the rotor assembly. The radius of the first circumference is greater than the radius of the second circumference.

[0017] In some embodiments, the rotor assembly further has a second cooling channel extending axially, a first cavity communicating with the outside world is formed in the first end cover, a second cavity communicating with the outside world is formed in the second end cover, and the second cooling channel connects the first cavity and the second cavity to form an external cooling channel.

[0018] In some embodiments, there are multiple external cooling channels, multiple second cooling channels are spaced apart on the third circumference of the rotor assembly, multiple first cavities corresponding to the second cooling channels are spaced apart on the first end cover, and multiple second cavities corresponding to the second cooling channels are spaced apart on the second end cover.

[0019] In some embodiments, the first end cover includes a first cover body and a first sealing ring, the first sealing ring is connected to the rotor assembly and can rotate with the rotor assembly, and the first sealing ring overlaps the first cover body; the second end cover includes a second cover body and a second sealing ring, the second sealing ring is connected to the rotor assembly and can rotate with the rotor assembly, and the second sealing ring overlaps the second cover body; the first sealing ring has a first air hole, and the second sealing ring has a second air hole; the first cover body has a first channel connected to the outside world, and the second cover body has a second channel connected to the outside world; the first channel and the first air hole are connected to form the first cavity, and the second channel and the second air hole are connected to form the second cavity.

[0020] In some embodiments, the first cover body has a first outer chamber with a first opening, the first sealing ring closes the first opening, and the first outer chamber connects each of the first air holes and each of the first channels; the second cover body has a second outer chamber with a second opening, the second sealing ring closes the second opening, and the second outer chamber connects each of the second air holes and each of the second channels.

[0021] In some embodiments, the motor includes a fan blade disposed on a side of the first sealing ring facing the first outer chamber.

[0022] In some embodiments, the fan blade is disposed on a side of the second sealing ring facing the second outer chamber.

[0023] In some embodiments, the fan blade is disposed on a side of the first sealing ring facing the first accommodating cavity.

[0024] In some embodiments, the fan blade is arranged on a side of the second sealing ring facing the second accommodating cavity.

[0025] In some embodiments, the motor further includes an isolation barrier disposed between the stator assembly and the rotor assembly; the rotor assembly, the isolation barrier, and the first end cover enclose a first inner chamber, the rotor assembly, the isolation barrier, and the second end cover enclose a second inner chamber, and the first cooling channel connects the first inner chamber and the second inner chamber to form the internal cooling channel.

[0026] In some embodiments, the isolation barrier includes a stator sleeve, an isolation ring and a sealing ring, and the isolation rings are respectively connected to the two axial ends of the stator sleeve, wherein the isolation ring and the first end cover at one end are connected through one sealing ring, and the isolation ring and the second end cover at the other end are connected through another sealing ring.

[0027] In some embodiments, the isolation ring includes an insulation member, an aerogel, and an insulation tube, the aerogel is disposed between the isolation member and the insulation tube, and the insulation tube is disposed facing the rotor assembly and connected to the corresponding sealing ring.

[0028] In some embodiments, the base comprises:

[0029] A main cylinder, wherein the inner wall of the main cylinder is processed circumferentially to form a third cooling channel which is open inside, and both ends of the third cooling channel are respectively connected to the outside; and

[0030] The inner cylinder is nested in the main cylinder to close the open third cooling channel.

[0031] In some embodiments, the main cylinder comprises:

[0032] outer cylinder;

[0033] Ancillary devices, including an upper hanging, a lower hanging, a safety bracket and a junction box base, are arranged on the outer peripheral side of the outer cylinder; and

[0034] An interface device, comprising a first interface and a second interface, which are arranged on the outer circumference of the outer cylinder, wherein the first interface and the second interface are respectively connected to two ends of the third cooling channel;

[0035] Wherein, the auxiliary device and the interface device are both integrally cast with the outer cylinder.

[0036] In some embodiments, the main cylinder further includes a reinforcement structure integrally cast with the outer cylinder. The reinforcement structure is disposed adjacent to the attachment device and extends axially along the outer cylinder to both ends of the outer cylinder.

[0037] In some embodiments, the machine base further includes a dustproof plate, and the dustproof plate is welded to the upper suspension.

[0038] In some embodiments, the rotor assembly includes a rotor core, and the rotor core includes:

[0039] A lamination body, comprising a plurality of rotor laminations stacked in a ring shape, wherein a plurality of first slot groups are arranged at intervals along the circumferential direction of the lamination body, each of the first slot groups comprising a pair of first slots symmetrically arranged along the D axis of the motor;

[0040] a magnetic isolation bridge, which is spaced apart between the pair of first grooves to form the internal magnetic isolation bridge on the punching sheet body between the inner ends of the pair of first grooves; and

[0041] A permanent magnet is disposed in the first slot; wherein the permanent magnet includes a magnetic body and an insulating layer, and the insulating layer is disposed on a side of the magnetic body close to the D axis.

[0042] In some embodiments, the first slot comprises:

[0043] a receiving groove for accommodating the permanent magnet; and

[0044] A dovetail groove is communicated with the placement groove, two ends of the placement groove protrude from two ends of the dovetail groove, and the dovetail groove is used to fix the permanent magnet.

[0045] In some embodiments, the cross-section of the magnetic body is trapezoidal, and the long bottom side of the magnetic body is located on a side away from the D-axis.

[0046] In some embodiments, the first groove is spaced apart from the outer circular edge of the punch body to form the magnetic isolation bridge of the outer circular edge.

[0047] In some embodiments, the magnetic body comprises:

[0048] A magnetic steel body comprising a comb back and a plurality of comb teeth spaced apart along the length direction of the comb back, the comb teeth being arranged at both ends along the width direction of the comb back, and comb tooth grooves being formed between adjacent comb teeth; and

[0049] The filling part is filled in the comb tooth groove.

[0050] In some embodiments, the comb teeth are infiltrated with heavy rare earth.

[0051] In some embodiments, the filling portion is insulating glue.

[0052] In some embodiments, the stator assembly includes a stator core, the stator core includes a plurality of stacked stator laminations, and the stator laminations include:

[0053] a yoke configured in a ring shape;

[0054] a plurality of tooth bodies, arranged at intervals along the inner side of the yoke in the circumferential direction, one end of each tooth body being connected to the yoke; and

[0055] Tooth shoe, the other end of each tooth body is connected to the corresponding tooth shoe;

[0056] Wherein, the tooth body and the yoke are both made of silicon steel material, and the tooth shoe is made of amorphous alloy material.

[0057] In some embodiments, the tooth shoe has a first connecting groove, and an end of the tooth body away from the yoke is disposed in the first connecting groove.

[0058] In some embodiments, the tooth body has a concave groove, and the tooth shoe has a protrusion, and the protrusion is disposed in the concave groove.

[0059] In some embodiments, the tooth body comprises:

[0060] a gear sleeve integrally formed with the yoke, the gear sleeve having a radially extending notch; and

[0061] a tooth core, disposed in the notch and adapted to the notch;

[0062] Wherein, the tooth sleeve is made of non-oriented silicon steel, and the tooth core is made of oriented silicon steel.

[0063] In some embodiments, the slot is open or closed at one end away from the yoke.

[0064] In some embodiments, the tooth core and the notch respectively have a matched top angle or a flat angle near the yoke.

[0065] In some embodiments, the tooth core is configured as oriented silicon steel sheets stacked in a circumferential direction or in an axial direction.

[0066] In some embodiments, the tooth body is made of oriented silicon steel, the yoke has a second connecting groove, and one end of the tooth body close to the yoke is arranged in the second connecting groove.

[0067] In some embodiments, the tooth body is configured as a stack of oriented silicon steel sheets of unequal widths, the cross section of the tooth body is trapezoidal, and the long bottom side of the tooth body is located on a side close to the yoke.

[0068] In some embodiments, the stator assembly includes the stator core, the stator winding, and the stator liner, wherein the stator core has teeth and slots formed between the teeth, and the stator winding is wound around the slots; the stator liner includes:

[0069] a slot filling portion, disposed in a tooth slot of the stator core; and

[0070] The connecting portion is connected to the slot filling portion in each of the tooth slots of the stator core to form an annular whole.

[0071] In some embodiments, the slot-filling portion includes:

[0072] a sealing unit disposed in the tooth groove; and

[0073] a filling unit, filled in the tooth groove and connected to the sealing unit;

[0074] The sealing unit is used to separate the filling unit from the stator winding and the teeth of the stator core, respectively, and the connecting portion is connected to the sealing unit and the filling unit in each tooth slot, respectively; or,

[0075] The sealing unit is used to separate the filling unit from the stator winding and the teeth of the stator core respectively, and the connecting portion is connected to the filling unit in each of the tooth slots.

[0076] In some embodiments, the sealing unit includes a plurality of stacked sealing layers, or the sealing unit is a single sealing layer.

[0077] In some embodiments, the filling unit includes a plurality of stacked filling layers, or the filling unit is a single filling layer.

[0078] In some embodiments, the connecting portion includes a plurality of stacked connecting layers, or the connecting portion is a single connecting layer.

[0079] In some embodiments, the sealing unit, the filling unit, and the connecting portion respectively include a reinforcing material and a matrix material, and the reinforcing material is impregnated in the matrix material; wherein the reinforcing material is a polymer material, and the matrix material includes a thermosetting resin.

[0080] In some embodiments, the matrix material includes a magnetic material.

[0081] In some embodiments, the motor further includes a heat conductor, the stator assembly includes a stator core and a stator winding, the stator winding has winding ends extending from both axial ends of the stator core; the heat conductor is provided between the winding ends at both ends and the machine base, for transferring the heat generated by the winding ends to the machine base.

[0082] In some embodiments, the heat conductive member includes a first heat conductive sleeve and a phase change temperature equalizing component, the first heat conductive sleeve is connected to the machine base, the phase change temperature equalizing component is arranged on the side of the first heat conductive sleeve facing the winding end, and the phase change temperature equalizing component wraps at least a portion of the winding end.

[0083] In some embodiments, the heat conductive member further includes a first fixing fastener, the first heat conductive sleeve is connected to the phase change temperature equalizing component via the first fixing fastener, one end of the first fixing fastener is connected to the first heat conductive sleeve, a first groove is formed between the other end of the first fixing fastener and the first heat conductive sleeve, and the phase change temperature equalizing component is arranged in the first groove.

[0084] In some embodiments, the first thermally conductive sleeve and the phase change temperature equalizing component are both cylindrical, and a plurality of the first fixing fasteners are arranged in a cylindrical shape. The other ends of the plurality of the first fixing fasteners arranged in a cylindrical shape form a first expansion opening, and the phase change temperature equalizing component is sleeved outside the first expansion opening.

[0085] In some embodiments, the first expansion opening has a third boss on its periphery, and the phase change temperature equalizing component is sleeved on the third boss.

[0086] In some embodiments, the phase change temperature equalizing component includes a heat sink and a phase change tube, one end of the heat sink is bent to form a second groove, one end of the phase change tube is arranged in the second groove, the phase change tube faces the winding end, and the heat sink is connected to the first heat conductive sleeve.

[0087] In some embodiments, the phase change temperature equalizing assembly further includes a second fixing fastener, there are multiple heat dissipation plates, two adjacent heat dissipation plates are connected by the second fixing fastener, and the multiple heat dissipation plates are connected into a cylindrical shape.

[0088] In some embodiments, the second fixing fastener is H-shaped with receiving grooves on both sides, and the heat sink is located in the receiving groove of the second fixing fastener; a single heat sink has multiple phase change tubes arranged side by side.

[0089] In some embodiments, the heat conducting member includes a second heat conducting sleeve and a heat conducting ring, the second heat conducting sleeve is connected to the machine base, the second heat conducting sleeve is axially connected to the heat conducting ring, and the heat conducting ring surrounds at least a portion of the winding end.

[0090] In some embodiments, the gap between the heat conducting member and the winding end is filled with a heat conducting medium.

[0091] In some embodiments, the gaps between the wires forming the winding ends are filled with a heat-conducting medium. The beneficial effects of the embodiments of the present application are:

[0092] The motor, the rotor assembly, the machine base and the first end cover are arranged to form a first accommodating cavity, and the rotor assembly, the machine base and the second end cover are arranged to form a second accommodating cavity. The rotor assembly has an axially extending first cooling channel, which connects the first accommodating cavity and the second accommodating cavity to form an internal cooling channel. The cooling medium takes away the heat generated by the rotor assembly along the internal cooling channel, thereby solving the problem of inefficient heat dissipation inside the rotor and improving the heat dissipation rate of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0093] FIG1 is an axial cross-sectional view of a motor in one embodiment of the present application;

[0094] Figure 2 is an enlarged view of point A in Figure 1;

[0095] Figure 3 is an enlarged view of point B in Figure 1;

[0096] FIG4 is a schematic structural diagram of a first sealing ring in one embodiment of the present application;

[0097] FIG5 is a schematic structural diagram of a second sealing ring in one embodiment of the present application;

[0098] FIG6 is a schematic structural diagram of the connection between the first sealing ring and the rotor pressure ring in one embodiment of the present application;

[0099] FIG7 is a schematic structural diagram of the connection between the second sealing ring and the rotor pressure ring in one embodiment of the present application;

[0100] FIG8 is a schematic structural diagram of a heat-insulating cylinder in one embodiment of the present application;

[0101] FIG9 is an axial cross-sectional view of a motor according to an embodiment of the present application;

[0102] Figure 10 is an enlarged view of point C in Figure 9;

[0103] Figure 11 is an enlarged view of point D in Figure 9;

[0104] FIG12 is a schematic structural diagram of a first heat-conducting sleeve in one embodiment of the present application;

[0105] FIG13 is a schematic diagram of a partial structure of a first fixing fastener in one embodiment of the present application;

[0106] FIG14 is a schematic structural diagram of the connection between the phase change temperature equalizing assembly and the first fixing fastener in one embodiment of the present application;

[0107] FIG15 is a partial schematic exploded view of point E in FIG14 ;

[0108] FIG16 is a schematic structural diagram of a second fixing fastener in one embodiment of the present application;

[0109] FIG17 is a schematic structural diagram of the connection between a single phase-change temperature vapor chamber and a second fixing fastener in one embodiment of the present application;

[0110] FIG18 is a schematic structural diagram of a single phase change temperature vapor chamber in one embodiment of the present application;

[0111] FIG19 is an axial cross-sectional view of a motor in another embodiment of the present application;

[0112] Figure 20 is an enlarged view of point F in Figure 19;

[0113] Figure 21 is an enlarged view of point G in Figure 20;

[0114] FIG22 is a schematic diagram of a partial cross-sectional structure of a second heat-conducting sleeve in one embodiment of the present application;

[0115] FIG23 is a schematic structural diagram of a heat conducting ring in one embodiment of the present application;

[0116] FIG24 is a schematic diagram of a motor base in one embodiment of the present application;

[0117] FIG25 is a schematic diagram of the main cylinder in one embodiment of the present application;

[0118] FIG26 is a schematic diagram of an inner cylinder in one embodiment of the present application;

[0119] FIG27 is a schematic diagram of a dustproof plate according to an embodiment of the present application;

[0120] FIG28 is a schematic diagram of a lower hanging in one embodiment of the present application;

[0121] FIG29 is a schematic diagram of a cooling channel of an equi-pitch spiral on a main cylinder in one embodiment of the present application;

[0122] FIG30 is a schematic diagram of a cooling channel of an unequal pitch spiral on a main cylinder according to an embodiment of the present application;

[0123] FIG31 is a schematic diagram of a three-channel Z-shaped cooling channel on the main cylinder in one embodiment of the present application;

[0124] FIG32 is a schematic diagram of a single-channel Z-shaped cooling channel on the main cylinder in one embodiment of the present application;

[0125] FIG33 is a schematic structural diagram of a stator punching sheet in one embodiment of the present application;

[0126] FIG34 is a partial view of the splicing of the tooth shoe and the tooth body of the stator punching sheet in one embodiment of the present application;

[0127] FIG35 is a partial view of the splicing of the tooth shoe and the tooth body of the stator punching sheet in one embodiment of the present application;

[0128] FIG36 is a partial view of a tooth body of a stator punching sheet in one embodiment of the present application;

[0129] FIG37 is a partial view of the tooth body of the stator punching away from the yoke portion in one embodiment of the present application;

[0130] FIG38 is a partial view of the tooth body of the stator punching away from the yoke portion in one embodiment of the present application;

[0131] FIG39 is a partial view of a stator punching tooth body near the yoke end in one embodiment of the present application;

[0132] FIG40 is a partial view of a stator punching tooth body near the yoke end in one embodiment of the present application;

[0133] FIG41 is a partial view of the connection between the yoke and the tooth body of a stator punching sheet in one embodiment of the present application;

[0134] FIG42 is a partial view of a tooth body of a stator punching sheet in one embodiment of the present application;

[0135] FIG43 is an enlarged partial view of the tooth core of the stator punching sheet near the yoke end in one embodiment of the present application;

[0136] FIG44 is a partial cross-sectional view of a tooth core of a stator punching sheet in one embodiment of the present application;

[0137] FIG45 is an enlarged partial view of the tooth body of the stator punching sheet near the yoke end in one embodiment of the present application;

[0138] FIG46 is a partial cross-sectional view of a tooth body of a stator punching sheet in one embodiment of the present application;

[0139] FIG47 is an enlarged partial view of the edge of the tooth body of a stator punching in one embodiment of the present application;

[0140] FIG48 is a partial perspective view of a tooth body of a stator punching sheet in one embodiment of the present application;

[0141] FIG49 is a cross-sectional schematic diagram of the matching structure of the stator assembly in one embodiment of the present application;

[0142] FIG50 is a partial enlarged view of the structure shown in FIG49 at point H;

[0143] FIG51 is a schematic structural diagram of a stator bushing of a stator core in one embodiment of the present application;

[0144] FIG52 is a schematic diagram of the three-dimensional structure of the rotor core in one embodiment of the present application;

[0145] FIG53 is a schematic structural diagram of a rotor core according to an embodiment of the present application;

[0146] FIG54 is a partial view of the first slot of the rotor core according to one embodiment of the present application;

[0147] FIG55 is a partial view of the first slot of the rotor core according to one embodiment of the present application;

[0148] FIG56 is a perspective view of a permanent magnet of a rotor core according to an embodiment of the present application;

[0149] FIG57 is a schematic structural diagram of a rotor core according to an embodiment of the present application;

[0150] FIG58 is a schematic structural diagram of a rotor core according to an embodiment of the present application;

[0151] FIG59 is a three-view diagram of a magnetic body structure according to an embodiment of the present application;

[0152] Figure 60 is a schematic structural diagram of the magnetic body in one embodiment of the present application.

[0153] Numbers in the figure: 1, base; 11, main cylinder; 111, outer cylinder; 112, accessory device; 1121, safety bracket; 1122, junction box base; 1123, upper suspension; 1124, lower suspension; 113, interface device; 1131, first interface; 1132, second interface; 114, reinforcement structure; 115, third cooling channel; 12, inner cylinder; 13, dustproof plate; 2, first end cover; 24a, first accommodating cavity; 22, first sealing ring; 22a, first air hole; 21, first cover; 21a, first channel; 21b, first opening; 211, first boss; 23, first bearing chamber; 231, first bearing; 24aa, first inner chamber; 24b, first outer chamber; 24c, first cavity; 3, second end cover; 34a, second accommodating chamber; 32, second sealing ring; 32a, second air hole; 31, second cover; 31a, second hole; 31b, second opening; 31c, second groove; 311, second boss; 33, second bearing chamber; 331, second bearing; 34aa, second inner chamber; 34b, second outer chamber; 34c, second cavity; 5, rotor assembly; 51, rotor core; 511, rotor punching; 512, first slot group; 513, first slot; 5131, Placement slot; 5132, dovetail slot; 513a, air slot; 52, rotor pressure ring; 53, magnetic isolation bridge; 531, weight reduction hole; 532, second slot; 533, magnetic isolation reinforcement; 54, permanent magnet; 541, magnetic body; 5411, groove; 5412, filling part; 5413, magnetic steel body; 54131, comb back; 54132, comb teeth; 5413a, comb tooth slot; 542, insulation layer; 5 a, first cooling channel; 5b, second cooling channel; 6, isolation barrier; 61, stator liner; 611, slot filling portion; 6111, sealing unit; 6112, filling unit; 612, connecting portion; 62, isolation ring; 621, thermal insulation member; 622, aerogel; 623, thermal insulation cylinder; 63, sealing ring; 631, support ring; 632, sealing strip; 63a, sealing groove; 9, transmission shaft; 9 1. Non-drive end; 92. Drive end; 10. Blade; 4. Stator assembly; 41. Stator core; 42. Stator winding; 421. Winding end; 411. Stator punching; 4111. Yoke; 4111a. Second connecting slot; 4112. Tooth; 41121. Tooth body; 41121a. Recessed slot; 411211. Tooth sleeve; 411212. Tooth core; 41121b. Notch; 41 121c, oriented silicon steel sheet; 41122, tooth boot; 41122a, first connecting groove; 41122b, raised portion; 411a, tooth groove; 7, thermal conductor; 71, first thermal sleeve; 71a, first hole; 71b, first groove; 72, phase change temperature equalizing assembly; 721, heat sink; 721a, second groove; 722, phase change tube; 723, second fixing fastener; 723a, receiving groove;73, first fixing fastener; 73a, first flared opening; 73b, third hole; 731, third boss; 74, second heat-conducting sleeve; 74a, second hole; 75, heat-conducting ring; 75a, third groove; 8, heat-conducting medium. DETAILED DESCRIPTION

[0154] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with 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 of the embodiments.

[0155] Please refer to Figure 1. An embodiment of the present application provides a motor, which includes a base 1, a first end cover 2, a second end cover 3, a stator assembly 4, a rotor assembly 5 and a transmission shaft 9.

[0156] The stator assembly 4 is located within the base 1 and is connected to the base 1. The rotor assembly 5 is located within the base 1, sleeved on the drive shaft 9, and can rotate synchronously with the drive shaft 9 to achieve power output. The rotor assembly 5 has a first cooling channel 5a extending axially. The rotor assembly 5 is rotatably connected to the first end cover 2 and the second end cover 3, respectively. The drive shaft 9 is supported by the first end cover 2 and the second end cover 3. The first end cover 2 is located at one axial end of the base 1 and is connected to the base 1, while the second end cover 3 is located at the other axial end of the base 1 and is connected to the base 1. The first end cover 2, the rotor assembly 5, and the base 1 enclose a first accommodating chamber 24a, and the second end cover 3, the rotor assembly 5, and the base 1 enclose a second accommodating chamber 34a. The first accommodating chamber 24a is connected to the second accommodating chamber 34a via the first cooling channel 5a, thereby forming an internal cooling channel. A cooling medium can circulate through the internal cooling channel to remove heat generated by the rotor assembly 5. The cooling medium can be air.

[0157] In some embodiments, there are at least two first cooling channels 5a, and the cooling medium circulates between the first accommodating chamber 24a, the two first cooling channels 5a, and the second accommodating chamber 34a. The direction of the cooling medium flow is not limited. For example, air can flow through the first accommodating chamber 24a, through one first cooling channel 5a, into the second accommodating chamber 34a, and from the second accommodating chamber 34a through another first cooling channel 5a into the first accommodating chamber 24a, forming a circulation flow, thereby removing heat generated by the rotor assembly 5.

[0158] In some embodiments, there are multiple first cooling channels 5a. These multiple first cooling channels 5a are divided into two groups and are circumferentially arranged on the rotor assembly 5. One group of first cooling channels 5a forms a first circumference, and the other group of first cooling channels 5a forms a second circumference. The radius of the first circumference is greater than the radius of the second circumference. It will be understood that the first cooling channels 5a located in the first circumference are closer to the stator assembly 4 than the first cooling channels 5a located in the second circumference. The multiple first cooling channels 5a can increase the flow of cooling medium, thereby improving the heat dissipation efficiency of the rotor assembly 5.

[0159] The cross-sectional shape of the first cooling channel 5a is not limited, and may be, for example, circular, rectangular, or polygonal.

[0160] In some embodiments, as shown in Figures 1, 2, and 3, the rotor assembly 5 further includes an axially extending second cooling channel 5b. A first cavity 24c communicating with the outside world is formed on the first end cover 2, located at one circumferential end of the second cooling channel 5b. A second cavity 34c communicating with the outside world is formed on the second end cover 3, located at the other axial end of the second cooling channel 5b. The first cavity 24c communicates with the second cavity 34c via the second cooling channel 5b. This forms an external cooling channel. Cooling medium can circulate with the outside world through the external cooling channel, removing heat generated by the rotor assembly 5.

[0161] In some embodiments, referring to Figures 1, 2, and 3, the cooling medium can circulate sequentially through the first cavity 24c, the second cooling channel 5b, and the second cavity 34c. Alternatively, the cooling medium can circulate sequentially through the second cavity 34c, the second cooling channel 5b, and the first cavity 24c. The cooling medium can circulate in any direction.

[0162] The cross-sectional shape of the second cooling channel 5b is not limited, and may be, for example, circular, rectangular, or polygonal.

[0163] In some embodiments, multiple second cooling channels 5b are provided. These multiple second cooling channels 5b are circumferentially spaced apart on the rotor assembly 5 to form a third circumference, where the radius of the third circumference is smaller than the radius of the second circumference. It will be appreciated that the second cooling channels 5b located on the third circumference are further away from the stator assembly 4 than the first cooling channels 5a located on the second circumference. The multiple second cooling channels 5b can increase the flow of cooling medium and improve the heat dissipation efficiency of the rotor assembly 5.

[0164] In some embodiments, the structure of the rotor assembly 5 is not limited. Please refer to Figures 1, 2 and 3. The rotor assembly 5 includes a rotor core 51 and a rotor pressure ring 52. The two rotor pressure rings 52 are respectively arranged at the axial ends of the rotor core 51.

[0165] It is understood that the rotor core 51 is generally formed by stacking multiple rotor laminations in the axial direction. Rotor pressure rings 52 can be provided at both axial ends of the rotor core 51, and the rotor pressure rings 52 are relatively fixed in the axial direction. On the one hand, the rotor pressure rings 52 can be used to position the rotor core 51 in the axial direction. On the other hand, the cross-sectional shape and area size of the rotor pressure ring 52 on the side closest to the rotor laminations can be designed to be as close as possible to the cross-sectional shape and area size of the rotor laminations. In this way, the rotor pressure ring 52 can achieve the function of compressing multiple rotor laminations.

[0166] In some embodiments, the first cooling channel 5a has the same position and cross-section on the rotor core 51 and the rotor pressing ring 52, and the second cooling channel 5b has the same position and cross-section on the rotor core 51 and the rotor pressing ring 52, so that heat transfer is smooth.

[0167] In some embodiments, referring to Figures 1, 2, and 3, the first end cover 2 includes a first sealing ring 22 and a first cover body 21. The first sealing ring 22, having a first air hole 22a, is disposed at one axial end of the rotor assembly 5. One end of the first sealing ring 22 is connected to the corresponding rotor pressure ring 52, and the other end of the first sealing ring 22 overlaps the first cover body 21. The first sealing ring 22 can rotate with the rotor assembly 5. The first cover body 21 has a first channel 21a. The first air hole 22a connects with the first channel 21a to form a first cavity 24c. The second cooling channel 5b communicates with the outside world through the first cavity 24c. The second end cover 3 includes a second sealing ring 32 and a second cover body 31. The second sealing ring 32, having a second air hole 32a, is disposed at the other axial end of the rotor assembly 5. One end of the second sealing ring 32 is connected to the corresponding rotor pressure ring 52, and the other end of the second sealing ring 32 overlaps the second cover body 31. The second sealing ring 32 can rotate with the rotor assembly 5. The second cover 31 has a second hole 31 a , and the second air holes 32 a are connected to the second hole 31 a to form a second cavity 34 c . The second cooling channel 5 b is connected to the outside through the second cavity 34 c .

[0168] It will be appreciated that the external cooling channel is connected to the outside world. This allows the cooling medium to transfer heat generated by the rotor assembly 5 to the outside world through the external cooling channel. Both the first sealing ring 22 and the second sealing ring 32 rotate with the rotor assembly 5. Therefore, a circumferential gap exists between the first sealing ring 22 and the first cover 21, and between the second sealing ring 32 and the second cover 31. This circumferential gap allows some of the heat in the internal cooling channel to flow to the outside world.

[0169] In some embodiments, the first air hole 22a and the second cooling channel 5b have the same position and cross-section, and the second air hole 32a and the second cooling channel 5b have the same position and cross-section, so that heat transfer is smooth.

[0170] The shapes of the first sealing ring 22 and the second sealing ring 32 are not limited, and may be bowl-shaped, for example. The cross-sectional shapes of the first air hole 22a and the second air hole 32a are not limited, and may be circular, rectangular, or polygonal, for example.

[0171] In some embodiments, referring to Figures 1, 2, and 3, the first cover 21 has a first outer chamber 24b with a first opening 21b. The first outer chamber 24b communicates with the first air hole 22a and the first channel 21a. The first sealing ring 22 seals the first opening 21b. Furthermore, a first boss 211 is circumferentially disposed at least partially along the inner wall of the first cover 21. A circumferential gap is formed between the first sealing ring 22 and the first boss 211, allowing some heat from the internal cooling channel to flow to the outside through the circumferential gap.

[0172] Continuing with Figures 1, 2, and 3, the second cover 31 has a second outer chamber 34b with a second opening 31b. The second outer chamber 34b communicates with the second air hole 32a and the second channel 31a. The second opening 31b is sealed by a second sealing ring 32. Furthermore, a second boss 311 is circumferentially provided on at least a portion of the inner wall of the second cover 31. A circumferential gap is formed between the second sealing ring 32 and the second boss 311, allowing some heat from the internal cooling channel to flow to the outside through the circumferential gap.

[0173] It should be noted that the first sealing ring 22 and the second sealing ring 32 can block part of the heat. In this way, the internal cooling channel and the external cooling channel meet the relative independence of thermal management to a certain extent, thereby improving the safety of motor operation.

[0174] In some embodiments, the first sealing ring 22 and the second sealing ring 32 block more than 90% of the heat.

[0175] In some embodiments, referring to FIG. 1 , the transmission shaft 9 is rotatably connected to the first end cap 2 via a first bearing chamber 23, and is rotatably connected to the second end cap 3 via a second bearing chamber 33. A first outer chamber 24b is formed around the first bearing chamber 23, which includes a first bearing 231. A second outer chamber 34b is formed around the second bearing chamber 33, which includes a second bearing 331. When the transmission shaft 9 begins to rotate, heat generated by the rotation of the first bearing 231 is transferred to the first outer chamber 24b via the first bearing chamber 23, and heat generated by the rotation of the second bearing 331 is transferred to the second outer chamber 34b via the second bearing chamber 33.

[0176] Furthermore, the cooling medium can enter through first channel 21a, remove the heat accumulated in first outer chamber 24b, remove the heat generated by rotor assembly 5 as it passes through second cooling channel 5b, and then remove the heat accumulated in second outer chamber 34b before being discharged through second channel 31a. This completes the entire heat dissipation process, reducing heat condensation in first and second outer chambers 24b, 34b, slowing the temperature rise rate around first and second bearing chambers 23, 33, and, to a certain extent, extending the service life of first and second bearings 231, 331.

[0177] In some embodiments, referring to FIG. 1 , FIG. 6 and FIG. 7 , the motor includes a fan blade 10 , which is disposed on a surface of the first sealing ring 22 facing the first accommodating cavity 24 a , and on a surface of the second sealing ring 32 facing the second outer cavity 34 b .

[0178] It can be understood that when the rotor assembly 5 starts to rotate, the rotor pressure ring 52 drives the first sealing ring 22 and the second sealing ring 32 to rotate, and the fan blades 10 will accelerate the flow rate of the airflow during the rotation process, further reducing the accumulation of heat flow in the first accommodating chamber 24a and the second outer chamber 34b, thereby improving the heat dissipation efficiency.

[0179] In other embodiments, the fan blades 10 are arranged on the surface of the first sealing ring 22 facing the first outer chamber 24b, and the fan blades 10 are arranged on the surface of the second sealing ring 32 facing the second accommodating chamber 34a, thereby reducing the accumulation of heat flow in the first outer chamber 24b and the second accommodating chamber 34a and improving the heat dissipation efficiency.

[0180] In other embodiments, the fan blades 10 are arranged on the two side surfaces of the first sealing ring 22, and the fan blades 10 are arranged on the two side surfaces of the second sealing ring 32, while reducing the accumulation of heat flow in the first accommodating cavity 24a, the second accommodating cavity 34a, the first outer cavity 24b and the second outer cavity 34b, thereby improving the heat dissipation efficiency.

[0181] It is understandable that the fan blades 10 can be arranged on the surfaces of the first sealing ring 22 and / or the second sealing ring 32 facing different chambers, so as to adapt to the heat dissipation requirements of different motors.

[0182] The shape of the fan blade 10 is not limited, and can be, for example, a trapezoidal blade, etc., and can be integrally formed or welded with the first sealing ring 22 or the second sealing ring 32 .

[0183] In some embodiments, referring to Figures 1 to 5 , a plurality of blades 10 are evenly spaced circumferentially between the first sealing ring 22 and the second sealing ring 32. This allows the cooling medium flowing through the first accommodating chamber 24a and the second outer chamber 34b to be evenly distributed, resulting in a more uniform cooling effect around the circumference of the rotor assembly 5 and reducing the risk of excessive localized temperature rise.

[0184] It can be understood that the fan blades 10 are evenly spaced circumferentially on the surface of the first sealing ring 22 facing the first outer chamber 24b and the surface of the second sealing ring 32 facing the second outer chamber 34b, which can quickly and evenly take away the heat from the first outer chamber 24b and the second outer chamber 34b, reduce the local heat accumulation on the peripheral sides of the first bearing chamber 23 and the second bearing chamber 33, thereby causing the lubrication failure of the first bearing 231 and the second bearing 331 due to excessive temperature, improve the safety of the motor operation, and at the same time extend the service life of the first bearing 231 and the second bearing 331 to a certain extent.

[0185] In some embodiments, referring to Figures 2 and 3 , an external cooling channel comprises at least a plurality of first channels 21a, which are circumferentially spaced apart on the first cover 21. An external cooling channel comprises at least a plurality of second channels 31a, which are circumferentially spaced apart on the second cover 31. Thus, the plurality of first channels 21a and the plurality of second channels 31a can increase the flow rate of the cooling medium and improve the heat dissipation efficiency of the motor.

[0186] In some embodiments, please continue to refer to Figures 2 and 3. The outer surface of the second cover body 31 has a second groove 31c, which can reduce the weight of the second cover body 31. At the same time, the second groove 31c is connected to at least one second channel 31a, thereby increasing the contact area between the external cooling channel and the outside world, further improving the heat dissipation efficiency of the motor.

[0187] The cross-sectional shape and length of the first channel 21a and the second channel 31a are not limited, and can be, for example, circular, rectangular or polygonal. The cross-sectional shape of the second groove 31c is not limited, and can be, for example, circular, rectangular or polygonal.

[0188] In some embodiments, fan blades 10 may be provided at any location within the internal cooling channel and the external cooling channel to accelerate local heat dissipation efficiency and improve the overall heat dissipation performance of the motor.

[0189] In some embodiments, the fan blades 10 include relatively stationary static fan blades 10 and rotatable relatively dynamic fan blades 10. "Relatively stationary" means that the fan blades 10 themselves do not rotate, but can rotate with other components or be installed on non-rotating components. "Relatively dynamic" means that the fan blades 10 themselves rotate, can rotate with other components or be installed on non-rotating components. For example, referring to Figure 6 or Figure 7, the fan blades 10 are relatively stationary static fan blades 10. When the motor starts running, the transmission shaft 9 rotates, driving the first sealing ring 22 and the second sealing ring 32 to rotate, and the static fan blades 10 follow the rotation, thereby improving the heat dissipation efficiency.

[0190] The material of the fan blade 10 is not limited, and can be, for example, a metal material or a non-metal material.

[0191] In some embodiments, referring to Figures 2 and 3 , the motor further includes an isolation barrier 6 positioned between the stator assembly 4 and the rotor assembly 5. The first end cap 2, the rotor assembly 5, and the isolation barrier 6 enclose a first inner chamber 24aa. The second end cap 3, the rotor assembly 5, and the isolation barrier 6 enclose a second inner chamber 34aa. The first inner chamber 24aa communicates with the second inner chamber 34aa via a first cooling channel 5a. This creates an internal cooling channel relatively isolated from the stator assembly 4, thereby reducing the transfer of heat from the internal cooling channel to the stator assembly 4. A cooling medium can circulate through the internal cooling channel, removing heat generated by the rotor assembly 5. The cooling medium can be air.

[0192] Please refer to Figures 2 and 3. The isolation barrier 6 includes a stator sleeve 61, an isolation ring 62 and a sealing ring 63. The stator assembly 4 includes a stator core 41 and a stator winding 42. The stator sleeve 61 is arranged between the stator core 41 and the rotor core 51 and extends axially. Its length is greater than the stator core 41 and the rotor core 51. One axial end of the stator sleeve 61 is connected to the isolation ring 62.

[0193] Furthermore, one end of an isolation ring 62 is connected to the stator sleeve 61, and the other end is connected to the first end cover 2 via a sealing ring 63. Another isolation ring 62 has one end connected to the stator sleeve 61, and the other end is connected to the second end cover 3 via another sealing ring 63. The isolation barrier 6 can separate the circumferential space between the stator assembly 4 and the rotor assembly 5.

[0194] It should be noted that the stator liner 61 is in close contact with the surface of the stator core 41 on one side close to the rotor core 51 , and can, to a certain extent, block the heat generated by the stator core 41 from being transferred to the air gap.

[0195] The material of the stator bushing 61 is not limited, and may be, for example, a non-metallic material.

[0196] In some embodiments, referring to Figures 2 and 3 , the isolation ring 62 includes a heat insulating member 621, an aerogel 622, and a heat insulating tube 623. The aerogel 622 is disposed between the heat insulating member 621 and the heat insulating tube 623. The heat insulating tube 623 is disposed facing the rotor assembly 5 and connected to the corresponding sealing ring 63.

[0197] Furthermore, the heat insulating member 621 and the aerogel 622 have heat insulating properties, and can block a portion of the heat generated by the stator winding 42 from being transferred to the first inner chamber 24aa and the second inner chamber 34aa.

[0198] It should be noted that, as shown in Figure 8 , the thermal insulation tube 623 is trumpet-shaped, with one end opening smaller than the other. The smaller end opening is positioned inward, while the larger end opening faces outward. The thermal insulation tube 623 can be made of metal, which enhances the overall rigidity of the isolation ring 62, thereby strengthening the securing effect between the isolation ring 62, the stator liner 61, and the sealing ring 63, and improving the overall stability of the isolation barrier 6.

[0199] The material of the thermal insulation member 621 is not limited, and may be, for example, glass cloth or polyetheretherketone. The material of the aerogel 622 is not limited, and may be, for example, gelatin or gum arabic. The metal material of the thermal insulation tube 623 is not limited and has thermal insulation properties, and may be, for example, aluminum.

[0200] In some embodiments, referring to Figures 2 and 3 , the isolation ring 62 has a curved portion, the curvature of which approximates the shape of the stator winding 42. Thus, different isolation rings 62 can be designed according to the different shapes of the stator winding 42, thereby improving the space utilization of the motor.

[0201] In some embodiments, referring to Figures 2 and 3 , the sealing ring 63 includes a support ring 631 and a sealing strip 632. The sealing strip 632 has a sealing groove 63a. The support ring 631 is disposed within the sealing groove 63a. A spring element is provided on the wall of the sealing groove 63a, with its free end facing the interior of the sealing groove 63a. This spring element enhances the securement between the support ring 631 and the sealing ring 63. The support ring 631 is connected to the corresponding isolation ring 62.

[0202] It should be noted that the support ring 631 is made of metal and the sealing ring 63 is made of rubber. Thus, the connection between the sealing ring 63 and the isolation ring 62 is a rigid connection, while the connection between the sealing ring 63 and the first end cover 2 is a flexible connection.

[0203] It will be appreciated that the connection between the isolation barrier 6 and the first end cap 2 is a flexible connection. This allows for the design of different isolation barriers 6 to suit different motor configurations, achieving, to a certain extent, compatibility between various motors and the isolation barrier 6. Using a variety of different component designs facilitates installation and reduces costs.

[0204] The metal material of the support ring 631 is not limited and has heat insulation properties, such as aluminum, etc. The rubber material of the sealing ring 63 is not limited, such as natural rubber and synthetic rubber, etc.

[0205] In some embodiments, referring to FIG. 3 , the connection method between the isolation barrier 6 and the second end cap 3 is described above. In conjunction with the aforementioned embodiments, it can be understood that the isolation barrier 6 partially blocks the transfer of heat generated during operation between the stator assembly 4 and the rotor assembly 5. The stator assembly 4 dissipates heat through other cooling methods, while the rotor assembly 5 dissipates heat through a self-ventilating dual-circulation airflow structure consisting of internal and external cooling channels. This allows the stator assembly 4 and the rotor assembly 5 to achieve a degree of relative independence in thermal management.

[0206] The cooling method of the stator assembly 4 is not limited, and can be, for example, air cooling or liquid cooling.

[0207] In some embodiments, the portion of heat blocked by the isolation barrier 6 is greater than 90%.

[0208] In some embodiments, referring to FIG. 9 , the stator assembly 4 includes a stator core 41 and a stator winding 42. The stator winding 42 has winding ends 421 extending from the axial ends of the stator core 41. The motor provided in the embodiment of the present application also includes a heat conductor 7 disposed between the winding ends 421 at the axial ends of the stator winding 42 and the base 1 to transfer heat generated by the winding ends 421 to the base 1.

[0209] It is understood that if the base 1 has a heat dissipation function, the temperature distribution of the stator assembly 4 during operation will be bathtub-like, with the stator core 41 being lower and the winding ends 421 being higher. The heat conducting member 7 disposed between the winding ends 421 and the base 1 provides multiple heat transfer channels to the winding ends 421, thereby achieving uniform temperature throughout the stator assembly 4 or reducing the temperature rise of the winding ends 421.

[0210] In some embodiments, please refer to Figures 10 and 11. The heat-conducting member 7 includes a first heat-conducting sleeve 71 and a phase-change temperature-averaging component 72. One end of the first heat-conducting sleeve 71 is connected to the base 1, and the phase-change temperature-averaging component 72 is provided between the first heat-conducting sleeve 71 and the winding end 421. It can be understood that the heat generated by the winding end 421 is transferred to the first heat-conducting sleeve 71 through the phase-change temperature-averaging component 72, and then transferred to the base 1 through the first heat-conducting sleeve 71. Further, please continue to refer to Figures 10 and 11. The phase-change temperature-averaging component 72 wraps at least a portion of the winding end 421 along the outer shape of the winding end 421. For example, the phase-change temperature-averaging component 72 wraps to the end of the winding end 421 to increase the wrapping area and improve the heat transfer efficiency.

[0211] It should be noted that in the related art solutions, the heat generated by the winding ends 421 is first transferred to the stator winding 42, then diffused to the stator core 41 via the stator winding 42, and finally transferred from the stator core 41 to the frame 1. Compared to the heat transfer of the winding ends 421 in the related art solutions, some embodiments of the present application shorten the heat transfer path and improve the heat transfer efficiency.

[0212] In some embodiments, as shown in Figures 10 and 11 , one end of the first thermally conductive sleeve 71 has a first hole 71 a. For example, referring again to Figures 10 and 11 , the first thermally conductive sleeve 71 has the first hole 71 a at the end away from the stator core 41 , thereby reducing the weight of the first thermally conductive sleeve 71 and, consequently, the overall weight of the motor, thereby lowering the motor's energy consumption and cost.

[0213] The material of the first heat-conducting sleeve 71 is not limited, and it can be made of aluminum or copper, for example.

[0214] In some embodiments, a plurality of first holes 71a are circumferentially spaced apart at one end of the first thermally conductive sleeve 71. This allows for more uniform thermal conductivity across the first thermally conductive sleeve 71, reduces localized heat accumulation, and improves the balance between motor weight reduction and thermal conductivity.

[0215] 12 , first holes 71 a of the same size are evenly spaced circumferentially around one end of the first heat-conducting sleeve 71. This ensures that the center of gravity of the first heat-conducting sleeve 71 is balanced and the overall structure is relatively stable.

[0216] In some embodiments, please refer to Figures 9 to 11. In order to adapt to the curvature of different winding ends 421, one end of the first thermal conductive sleeve 71 is thicker than the other end, so that after assembly, it can contact the winding end 421 (through the phase change temperature equalization component 72) and the base 1 respectively to enhance the heat dissipation effect.

[0217] The cross-sectional shape of the first hole 71 a is not limited, and may be, for example, circular, rectangular, or trapezoidal.

[0218] In some embodiments, the first thermal sleeve 71 is extended axially as much as possible to increase the contact area with the base 1. The first thermal sleeve 71 and the base 1 are connected in a mating manner, and a thermal interface material is applied to the mating surface to improve the efficiency of heat transfer.

[0219] The thermal interface material is not limited, and may be, for example, thermally conductive silicone or thermally conductive grease.

[0220] In some embodiments, the thermally conductive member 7 further includes a first fixing fastener 73, as shown in Figures 10 and 11 . One end of the first fixing fastener 73 is connected to the first thermally conductive sleeve 71, and the other end forms a first groove 71b with the side of the first thermally conductive sleeve 71 facing the winding end 421. The phase change temperature-averaging assembly 72 is connected to the first thermally conductive sleeve 71 via the first groove 71b. It will be appreciated that the aforementioned method can tightly connect the first thermally conductive sleeve 71 and the phase change temperature-averaging assembly 72, thereby increasing the overall stability of the thermally conductive member 7.

[0221] In some embodiments, as shown in Figure 13 , the connection between the first fixing fastener 73 and the first thermally conductive sleeve 71 includes a third hole 73b, through which the first fixing fastener 73 and the first thermally conductive sleeve 71 are fixedly connected. This ensures that the first fixing fastener 73 and the first thermally conductive sleeve 71 form a single unit, ensuring that the first fixing fastener 73 and the first thermally conductive sleeve 71 remain stable and do not move relative to each other during motor operation. Furthermore, the first fixing fastener 73 is fixed relative to the first thermally conductive sleeve 71, thereby securing the position of the first groove 71b and facilitating installation and removal of the phase change temperature-stabilizing assembly 72.

[0222] The material of the first fixing fastener 73 is not limited, and can be, for example, aluminum.

[0223] In some embodiments, as shown in Figures 14 and 15 , the phase-change temperature-averaging assembly 72 is cylindrical, and multiple first fixing fasteners 73 are formed around the cylindrical shape. The multiple first fixing fasteners 73 have a first flared opening 73a formed therein. The phase-change temperature-averaging assembly 72 is sleeved within the first flared opening 73a to form the structure shown in Figure 14 , facilitating connection with the first thermally conductive sleeve 71.

[0224] Furthermore, the phase change temperature equalizing component 72 is connected to the first heat conductive sleeve 71 through the first fixing fastener 73 to form a cylindrical heat conductive component 7. The contact area between the phase change temperature equalizing component 72 and the first heat conductive sleeve 71 is increased, thereby increasing the heat transferred.

[0225] It is understood that the phase-change temperature-averaging assembly 72 circumferentially surrounds at least a portion of the winding end 421. Compared to other circumferentially arranged phase-change temperature-averaging assemblies 72, the cylindrical phase-change temperature-averaging assembly 72 covers a larger area of ​​the winding end 421, thereby increasing the amount of heat transferred from the winding end 421 to the phase-change temperature-averaging assembly 72. This increases the amount of heat transferred to the motor base 1 via the heat-conducting member 7, improving the heat dissipation efficiency of the winding end 421 and enhancing the operating environment of the motor.

[0226] In some embodiments, please refer to FIG. 13 , the first fixing fastener 73 has a third boss 731 on the periphery of the first flared opening 73a. It is understandable that, in combination with some of the aforementioned embodiments, when the phase-change temperature-averaging component 72 is disposed in the first groove 71b, the third boss 731 exerts a certain amount of extrusion on the phase-change temperature-averaging component 72, thereby increasing the stability of the phase-change temperature-averaging component 72 and the first thermally conductive sleeve 71. Furthermore, due to the extrusion effect, a certain force is exerted on the contact surface between the third boss 731 and the phase-change temperature-averaging component 72, causing deformation on the contact surface and the surrounding side. In this way, the thermal resistance of the contact surface and the surrounding side is reduced, thereby improving the heat transfer efficiency.

[0227] In some embodiments, referring to Figures 10, 11, and 18, the phase change temperature-averaging assembly 72 includes a heat sink 721 and a phase change tube 722. The heat sink 721 is in contact with the first thermal sleeve 71, with one end bent to form a second groove 721a. One end of the phase change tube 722 is disposed in the second groove 721a, with the phase change tube 722 facing the winding end 421. Furthermore, the heat sink 721 and the phase change tube 722 extend axially together to surround at least a portion of the winding end 421.

[0228] It can be understood, referring to Figures 10 and 11, that the wire that makes up the winding end 421 has a certain curvature due to the winding method, and at the same time, the end extending together from the heat sink 721 and the phase change tube 722 also has a certain curvature and fits the winding end 421, thereby reducing the gap between the winding end 421 and the phase change tube 722, and then reducing the thermal resistance between the winding end 421 and the phase change tube 722, thereby improving the heat transfer efficiency.

[0229] It should be noted that both the heat sink 721 and the phase change tube 722 can be formed by bending. By adjusting the degree of bending of the heat sink 721 and the phase change tube 722, they can be adapted to different winding ends 421 and conform as closely as possible to the curvature of the winding ends 421. By reducing the gap between the winding ends 421 and the phase change tube 722, thermal resistance is reduced, thereby improving heat dissipation efficiency.

[0230] In some embodiments, the phase change tube 722 is at least partially filled with an incompatible phase change medium. The phase change medium absorbs or dissipates heat during the transition from one phase to another, and the phase change medium's transition process can be cyclical. For example, water absorbs heat when it transitions from liquid to gas and dissipates heat when it transitions from gas to liquid. In this way, the cyclically transitioned phase change medium can be reused, saving costs.

[0231] The material of the phase change medium is not limited, and may be, for example, a hydrated salt phase change material or a wax phase change material.

[0232] The material of the heat sink 721 and the phase change tube 722 is not limited, and they can be made of aluminum or copper, for example.

[0233] In some embodiments, referring to FIG. 16 , the phase-change temperature-balancing assembly 72 further includes a second fixing fastener 723 . The second fixing fastener 723 may be an H-shaped component having accommodating grooves 723 a on both sides.

[0234] It should be noted that the material of the second fixing fastener 723 can be a highly elastic polymer material. In this way, the second fixing fastener 723 has a certain elasticity and can adapt to heat dissipation plates 721 of different thicknesses and different curvatures.

[0235] In some embodiments, as shown in FIG17 , one side of a heat sink 721 is connected to a receiving slot 723a on one side of a second fixing fastener 723. Furthermore, the other receiving slot 723a on the second fixing fastener 723 is connected to one side of another heat sink 721. In this way, multiple heat sinks 721, through multiple second fixing fasteners 723, form phase-change temperature-averaging assemblies 72 of varying sizes, enabling the phase-change temperature-averaging assemblies 72 to adapt to various winding ends 421.

[0236] Furthermore, in combination with some of the aforementioned embodiments, the phase change temperature equalizing component 72 after overall processing is a trumpet-shaped structure with a small area at one end and a large area at the other end. The use of multiple heat dissipation plates 721 spliced ​​together by multiple second fixing fasteners 723 facilitates the installation of the phase change temperature equalizing component 72 and saves costs.

[0237] It can be understood that the heat sink 721 is a rigid component and the second fixing fastener 723 is a flexible component. Disturbance is inevitable during the operation of the motor. When the force generated by the disturbance is directly or indirectly transmitted to the second fixing fastener 723 through the heat sink 721, the elastic force of the second fixing fastener 723 will offset part of the force, thereby improving the stability of the phase change temperature equalizing component 72, and then enhancing the overall stability of the heat conductor 7.

[0238] The material of the second fixing fastener 723 is not limited and can be thermally conductive, such as silicone rubber.

[0239] In some embodiments, as shown in FIG18 , multiple heat sinks 721 are provided, and multiple phase change tubes 722 are arranged in parallel on one side of each heat sink 721 to form a single phase change temperature balancing assembly 72. This improves the thermal conductivity of each phase change temperature balancing assembly 72, thereby improving the thermal conductivity of the entire phase change temperature balancing assembly 72 and accelerating heat transfer.

[0240] In some embodiments, referring to Figures 10 and 11 , a gap is provided between the heat conductor 7 and the winding end 421. Furthermore, the wires constituting the winding end 421 also form a certain gap during the winding process. This gap increases the thermal resistance, causing the heat generated by the winding end 421 to accumulate locally during the transfer process, thereby causing a large local temperature rise and reducing the safety of the motor during operation. Therefore, the gap between the phase change temperature equalization component 72 and the winding end 421, as well as the gaps between the wires constituting the winding end 421, are filled with a heat conductive medium 8, thereby reducing the gap volume, reducing the thermal resistance between the phase change temperature equalization component plate and the winding end 421, and between the wires, and improving the heat transfer efficiency.

[0241] The material of the heat-conducting medium 8 is not limited, and can be, for example, heat-conducting silica gel or heat-conducting potting glue.

[0242] In some embodiments, as shown in Figures 9 to 11 , the winding end 421 is circumferentially reduced in the axial direction by reducing the extension of the first thermally conductive sleeve 71 to form the first accommodating cavity 24a. This reduces the weight of the motor and, to a certain extent, meets the requirements for lightweight motor design. In some specific embodiments, compared to designs where the first thermally conductive sleeve 71 extends to the end of the winding end 421, reducing the axial extension of the first thermally conductive sleeve 71 reduces the weight by 30% to 50% of the original weight of the first thermally conductive sleeve 71.

[0243] In some embodiments, referring to Figures 19 to 21 , the heat conducting member 7 includes a second heat conducting sleeve 74 and a heat conducting ring 75. One end of the second heat conducting sleeve 74 is matingly connected to the machine base 1, and the heat conducting ring 75 is axially connected to the second heat conducting sleeve 74. The second heat conducting sleeve 74 and the heat conducting ring 75 together surround at least a portion of the winding end 421. For example, the second heat conducting sleeve 74 and the heat conducting ring 75 together surround the end of the winding end 421, thereby increasing the surrounding area and improving heat transfer efficiency.

[0244] It can be understood that at this time, the heat generated by the winding end 421 is transferred to the base 1 through the second heat-conducting sleeve 74 and the heat-conducting ring 75. Compared with the heat transfer path in the aforementioned related technical solutions, this heat transfer method still shortens the heat transfer path and improves the heat transfer efficiency.

[0245] In some embodiments, as shown in Figures 20 and 21 , a second hole 74a is formed at one end of the second thermally conductive sleeve 74. For example, referring again to Figures 20 and 21 , the second hole 74a is formed at the end of the second thermally conductive sleeve 74 near the stator core 41, thereby reducing the weight of the second thermally conductive sleeve 74 and, consequently, the overall weight of the motor, thereby lowering the motor's energy consumption and cost.

[0246] The material of the second heat-conducting sleeve 74 is not limited, and can be, for example, aluminum or copper.

[0247] In some embodiments, a plurality of second holes 74a are circumferentially spaced apart at one end of the second thermally conductive sleeve 74. This provides more uniform thermal conductivity across the second thermally conductive sleeve 74, reduces localized heat accumulation, and enhances the balance between motor weight reduction and thermal conductivity.

[0248] 22 , the second heat-conducting sleeve 74 is a cylindrical structure, and second holes 74a of the same size are evenly spaced circumferentially at one end of the second heat-conducting sleeve 74. This balances the center of gravity of the second heat-conducting sleeve 74 and makes the overall structure relatively stable.

[0249] In some embodiments, referring to FIG. 22 , to accommodate the curvature of the winding ends 421 , one end of the second heat-conducting sleeve 74 is thicker than the other, and the second holes 74 a are located at the thicker end. This increases the volume of the gap, thereby further reducing the weight of the motor.

[0250] It should be noted that the first heat-conducting sleeve 71 and the second heat-conducting sleeve 74 can have the same structure, that is, the first hole 71 a is arranged at the thicker end of the first heat-conducting sleeve 71, so as to reduce the weight of the motor.

[0251] The cross-sectional shape of the second hole 74a is not limited, and may be, for example, circular, rectangular, or trapezoidal.

[0252] In some embodiments, the second thermal sleeve 74 is extended as much as possible in the axial direction to increase the contact area with the machine base 1. The second thermal sleeve 74 and the thermal ring 75 are both connected to the machine base 1, and the mating surfaces are coated with thermal interface materials to improve the heat transfer efficiency.

[0253] The thermal interface material is not limited, and may be, for example, thermally conductive silicone or thermally conductive grease.

[0254] In some embodiments, as shown in Figures 20, 21, and 23, the heat-conducting ring 75 is a cylindrical structure with one end being thicker than the other. The thinner end of the heat-conducting ring 75 is connected to the thinner end of the second heat-conducting sleeve 74 in some of the aforementioned embodiments, thereby forming an annular third groove 75a. It will be appreciated that the third groove 75a closely matches the outer shape of the winding end 421, thereby reducing the gap between the entire heat-conducting member 7 and the winding end 421, thereby lowering thermal resistance and improving heat transfer efficiency.

[0255] Further, referring to Figures 20 and 21 , the heat-conducting member 7, which is composed of the second heat-conducting sleeve 74 and the heat-conducting ring 75, has a spindle-shaped gap in the middle. This makes it difficult to directly install the heat-conducting member 7 around the winding end 421 after integral processing. The aforementioned connection method of the second heat-conducting sleeve 74 and the heat-conducting ring 75 facilitates installation and saves costs.

[0256] The material of the heat conducting ring 75 is not limited, and it can be made of aluminum or copper, for example.

[0257] In some embodiments, referring to Figures 20 and 21 , gaps are provided between the second heat-conducting sleeve 74 and the heat-conducting ring 75 and the winding end 421. Furthermore, gaps are provided between the wires comprising the winding end 421. These gaps are filled with a heat-conducting medium 8, thereby reducing the volume of the gaps and lowering the thermal resistance between the heat-conducting member 7, the winding end 421, and the wires, thereby improving heat transfer efficiency.

[0258] The heat-conducting medium 8 is not limited, and can be, for example, heat-conducting silica gel or heat-conducting potting glue.

[0259] In some embodiments, as shown in Figures 19 to 21 , by reducing the axial extension of the second thermally conductive sleeve 74 and the thermally conductive ring 75, the thermally conductive ring 75 circumferentially forms a second accommodating cavity 34a, thereby reducing the weight of the motor and, to a certain extent, meeting the lightweight design requirements of the motor. In some specific embodiments, compared to designs where the second thermally conductive sleeve 74 and the thermally conductive ring 75 extend to the ends of the winding ends 421, reducing the axial extension of the second thermally conductive sleeve 74 and the thermally conductive ring 75 reduces the weight by 20% to 40% of the original combined weight of the second thermally conductive sleeve 74 and the thermally conductive ring 75.

[0260] In some embodiments, referring to FIG. 9 and FIG. 21 , the base 1 has a third cooling channel 115 , and the cooling method is not limited, and may be, for example, air cooling or liquid cooling.

[0261] In some embodiments, as shown in FIG. 24 , the base 1 includes a main cylinder 11 and an inner cylinder 12 . The outer wall of the stator core 41 is tightly connected to the inner wall of the inner cylinder 12 , and the winding ends 421 are also connected to the inner wall of the inner cylinder 12 via heat conducting members 7 . It is understood that the base 1 can be used to dissipate heat from the stator core 41 and winding ends 421 in the stator assembly 4 .

[0262] Further, referring to Figure 25 , the main cylinder 11 includes an outer cylinder 111, an attachment 112, and an interface device 113. Attachment 112 includes an upper suspension 1123, located on the outer periphery of outer cylinder 111. Interface device 113 includes a first interface 1131 and a second interface 1132, located on the outer periphery of outer cylinder 111 for inputting or outputting cooling medium. Attachment 112 and interface device 113 are integrally cast with outer cylinder 111.

[0263] It is understood that the main cylinder 11 of the present embodiment significantly reduces the amount of welding while maintaining structural strength. For example, in some specific embodiments, the amount is only 10% of that of a conventional welded motor base. The main cylinder 11 of the present embodiment has fewer special operations, a shorter manufacturing cycle, and a simpler manufacturing process, effectively reducing the weight and manufacturing cost of the motor base 1.

[0264] The specific material of the main cylinder 11 is not limited and can be metal, such as iron, steel or aluminum.

[0265] Furthermore, the ends of the attachment device 112 and the interface device 113 close to the outer cylinder 111 are connected to the outer cylinder 111 by arcs in a smooth transition. The radius of the arcs can range from R10 to R15, which is beneficial to improving the overall strength of the integral casting of the main cylinder 11.

[0266] Please continue to refer to Figure 25. The accessory device 112 also includes a lower suspension 1124, a safety bracket 1121 and a junction box base 1122. The upper suspension 1123 is arranged at the upper part of one side of the outer cylinder 111, the safety bracket 1121 is arranged at the upper part of the other side of the outer cylinder 111, the junction box base 1122 is arranged between the upper suspension 1123 and the safety bracket 1121, the lower suspension 1124 is arranged at the lower part of one side of the outer cylinder 111, and the lower suspension 1124 and the upper suspension 1123 are located on the same side of the outer cylinder 111.

[0267] Compared to conventional welded machine bases, the embodiments of the present application eliminate the need for welding the attachment device 112 and the interface device 113 to the outer cylinder 111, significantly reducing the amount of welding required on the main cylinder 11. This improves the casting yield rate while also allowing the wall thickness of the main cylinder 11 to be thinned and adjusted. For example, to ensure the welding strength of structures such as the attachment device 112 and the interface device 113 and to avoid problems such as welding through the outer cylinder 111, conventional welded machine bases require the design of a transverse through-draw plate of a certain thickness on the surface of the outer cylinder 111, or the increase in the overall thickness of the outer cylinder 111. This overall design is highly redundant and prone to welding defects, making it unfavorable to achieving a low-cost, high-power permanent magnet motor.

[0268] Further, referring to FIG. 28 , the lower suspension 1124 is a hexahedron with a cavity inside, which is beneficial for local weight reduction of the main cylinder 11 while meeting the strength requirement.

[0269] In addition, the main cylinder 11 also includes a reinforcement structure 114 integrally cast with the outer cylinder 111. This reinforcement structure 114 is positioned adjacent to the attachment 112 and located on the outer periphery of the outer cylinder 111 to reinforce the outer cylinder 111 and the attachment 112. The reinforcement structure 114 can extend along the axis of the outer cylinder 111 to both ends of the outer cylinder 111. The reinforcement structure 114 can be configured as an elongated strip. The cross-sectional shape of the reinforcement structure 114 is not limited and can be triangular, rectangular, trapezoidal, elliptical, or semicircular.

[0270] Exemplarily, eight reinforcement structures 114 are unevenly distributed circumferentially on the outer cylinder 111 , wherein reinforcement structures 114 are provided on both sides of the upper suspension 1123 , the lower suspension 1124 and the safety bracket 1121 , and the remaining two reinforcement structures 114 are arranged at the lower right side of the outer cylinder 111 .

[0271] In some embodiments, one of the first interface 1131 and the second interface 1132 is a liquid inlet for inputting a cooling medium, and the other of the first interface 1131 and the second interface 1132 is a liquid outlet for outputting a cooling medium. The cooling medium may be water or oil.

[0272] When both first interface 1131 and second interface 1132 are internally threaded and located on the upper portion of outer cylinder 111, they facilitate connection to the outside world. When both first interface 1131 and second interface 1132 are externally threaded, interface device 113 is located on the lower portion of outer cylinder 111 and connected to the outside world via a gland, reducing casting difficulty. In other words, the thread design of interface device 113 can be appropriately selected as either internal or external threads depending on the location of interface device 113 to ensure its airtightness.

[0273] Referring to Figures 24 and 27 , the motor base 1 also includes a dust shield 13, located on and welded to the upper hanger 1123. Because the dust shield 13 is a non-load-bearing component, the redundant design of the original welded motor base, where the dust shield 13 and the upper hanger 1123 are integrally formed, can be eliminated. By thinning and adjusting the dust shield 13, manufacturing it separately, and then welding it to the upper hanger 1123, the motor base 1 is partially lightweight.

[0274] The specific material of the dustproof plate 13 is not limited, and can be metal, such as iron, steel or aluminum.

[0275] Please refer to Figures 29 to 32. A third cooling channel 115 with an inner side open is formed on the circumference of the inner wall of the main cylinder 11. The two ends are respectively connected to the first interface 1131 and the second interface 1132. The inner cylinder 12 is nested inside the main cylinder 11 to close the open third cooling channel 115.

[0276] The specific material of the inner cylinder 12 is not limited and can be metal, such as iron, steel or aluminum.

[0277] It is understood that, compared to the conventional welded motor base method of welding cooling ducts to the inner cylinder 12, the wall thickness of the inner cylinder 12 in the present embodiment is not restricted by the manufacturing process and only needs to be welded to the main cylinder 11 at both ends. This facilitates thinning of the inner cylinder 12 wall thickness and reduces the weight of the motor base 1. The thinned inner cylinder 12 has a lower thermal resistance, which facilitates heat dissipation from the stator assembly. Furthermore, the thinner inner cylinder 12 has less welding volume, which makes the motor base 1 less prone to deformation and does not require annealing for stress relief after welding.

[0278] Furthermore, the wall thickness of the outer cylinder 111 at the third cooling channel 115 depends on the processing depth of the cooling channel and is not limited by the casting process. The wall thickness of the outer cylinder 111 can also be adjusted to be thinner to further reduce the weight of the motor base 1.

[0279] Referring to Figures 29 to 32 , the third cooling channel 115 can be configured in a spiral or Z-shaped configuration based on design requirements. A spiral third cooling channel 115 can be configured as a single spiral with equal pitch, a single spiral with unequal pitch, multiple spirals with equal pitch, or multiple spirals with unequal pitch. A Z-shaped third cooling channel 115 can be configured as a single-channel Z-shape, a dual-channel Z-shape, or a triple-channel Z-shape.

[0280] Exemplarily, FIG29 is a spiral third cooling channel 115 with equal pitch, FIG30 is a spiral third cooling channel 115 with non-equal pitch, FIG31 is a three-channel Z-shaped third cooling channel 115, and FIG32 is a single-channel Z-shaped third cooling channel 115.

[0281] Furthermore, the spiral third cooling channel 115 is distributed along the circumference of the outer cylinder 111 and has slightly weaker axial strength. Therefore, planar bosses can be provided on both sides and the bottom of the outer cylinder 111 to further ensure the axial strength of the main cylinder 11. The Z-shaped third cooling channel 115 itself strengthens the main cylinder 11, eliminating the need for planar bosses.

[0282] Referring to Figures 24-26 , the inner cylinder 12 and outer cylinder 111 are mated, for example, with an interference fit. A rubber coating can be applied to the mating surfaces, and an anti-corrosion coating can be applied to the cooling channel to enhance the cooling channel's airtightness and corrosion resistance. It is important to note that the ends of the third cooling channel 115 must maintain a predetermined distance from the ends of the main cylinder 11 to prevent damage to the rubber coating during welding of the main cylinder 11 to the inner cylinder 12, thereby ensuring the airtightness of the third cooling channel 115.

[0283] It should be noted that, in combination with Figures 1, 9 and 25, the stator sleeve 6 separates the rotor assembly 5 and the stator assembly 4 into two relatively independent parts, so that the rotor assembly 5 and the stator assembly 4 adopt different thermal management modes respectively. The rotor assembly 5 dissipates heat through a self-fan double-circulation air path structure composed of an internal cooling channel and an external cooling channel, and the stator assembly 4 is tightly connected to the integrated base 1 through a heat conductor 7 for heat dissipation. The rotor assembly 5 and the stator assembly 4 dissipate heat in different ways at a lower cost, which is beneficial to controlling the operating temperature of the motor within a narrower range and also achieves lightweighting of the motor.

[0284] In some embodiments, referring to FIG. 33 , the stator assembly 4 includes a stator core 41, the stator core 41 includes a plurality of stacked stator punchings 411, the stator punchings 411 include a yoke 4111, a plurality of tooth bodies 41121, and a plurality of tooth boots 41122. The yoke 4111 is configured in a ring shape. The plurality of tooth bodies 41121 are circumferentially spaced along the inner side of the yoke 4111, and one end of the tooth body 41121 is connected to the yoke 4111. The other end of each tooth body 41121 is connected to the corresponding tooth boot 41122. In order to fully utilize the performance of each material, the tooth body 41121 and the yoke 4111 are both made of silicon steel, and the tooth boot 41122 is made of amorphous alloy.

[0285] Specifically, the stator laminations 411 are spaced apart from each other, each connected to the inner side of the yoke 4111. As shown in FIG33 , the stator laminations 41121 can be laminated to form the stator core 41 of the motor. Silicon steel materials include non-oriented silicon steel and oriented silicon steel. Non-oriented silicon steel has a silicon content of 0.5% to 3.0% and a disordered grain arrangement. oriented silicon steel has a silicon content of 3.0% or more and an ordered grain arrangement.

[0286] Since the tooth shoe 41122 is made of amorphous alloy material, the tooth shoe 41122 has the excellent low coercive force and high resistivity characteristics of amorphous alloy material, thereby reducing the impact of high-frequency pulse magnetic field on the tooth shoe 41122, reducing the hysteresis and eddy current losses of the motor, and reducing the energy loss of the motor; and then the thermal conductivity of the amorphous alloy material is much lower than that of silicon steel material, making it difficult for the heat generated by the coil installed between two adjacent tooth bodies 41121 to be transmitted to the inside of the iron core, realizing the directional transmission of heat in the iron core.

[0287] In some embodiments, as shown in Figure 34 , the tooth shoe 41122 has a first connecting groove 41122a, and the end of the tooth body 41121 facing away from the yoke 4111 is disposed within the first connecting groove 41122a. Specifically, the shape of the first connecting groove 41122a matches the shape of the tooth body 41121. For example, the cross-section of the tooth body 41121 is a parallel tooth shape with uniform width, and the first connecting groove 41122a is rectangular. Furthermore, an adhesive is applied within the first connecting groove 41122a and / or on the end of the tooth body 41121 facing away from the yoke 4111 to enhance the connection strength between the tooth shoe 41122 and the tooth body 41121.

[0288] It should be noted that the tooth boot 41122 has a first connecting groove 41122a, which can ensure the material integrity of the tooth body 41121 when the tooth boot 41122 is connected to the tooth body 41121, and avoid the weakening of the saturation magnetic induction intensity of the tooth body 41121 due to the connection between the tooth boot 41122 and the tooth body 41121.

[0289] In some embodiments, as shown in FIG35 , the tooth body 41121 has a concave groove 41121a, and the tooth shoe 41122 has a raised portion 41122b, which is disposed within the concave groove 41121a. The raised portion 41122b has a shape that matches the shape of the concave groove 41121a. For example, the concave groove 41121a is a trapezoid with a short top edge proximal to the tooth shoe 41122, while the raised portion 41122b is a trapezoid with a long bottom edge proximal to the tooth body 41121. Furthermore, an adhesive is applied within the concave groove 41121a and / or on the raised portion 41122b to strengthen the engagement between the tooth body 41121 and the tooth shoe 41122.

[0290] It should be noted that the tooth body 41121 has a recessed groove 41121a, which allows the raised portion 41122b of the tooth boot 41122 to penetrate deep into the tooth body 41121. The trapezoidal shape of the recessed groove 41121a limits the movement of the raised portion 41122b, thereby enhancing the connection between the tooth body 41121 and the tooth boot 41122.

[0291] Correspondingly, the splicing of the tooth body 41121 and the tooth boot 41122 realizes the complete decoupling of the shape of the tooth boot 41122 from the process capability, process requirements and electromagnetic performance requirements. The shape of the tooth boot 41122 can be freely determined according to the requirements of electromagnetic performance. A small dovetail structure in which the tooth body 41121 is larger than the cross-sectional width of the tooth boot 41122 and a large dovetail structure in which the tooth 3 is smaller than the cross-sectional width of the tooth boot 41122 can be adopted to maximize the performance of the motor.

[0292] The shape of the tooth shoe 41122 can be freely determined according to the requirements of electromagnetic performance, and the groove between two adjacent tooth shoes 41122 can be eliminated, so that the top of the coil between two adjacent tooth bodies 41121 is directly in contact with the tooth shoe 41122, which is convenient for dissipating heat from the top coil, reducing the hot spot temperature of the coil and reducing the hysteresis loss of the motor.

[0293] In some embodiments, as shown in FIG36 , the tooth body 41121 includes a tooth sleeve 411211 and a tooth core 411212. The tooth sleeve 411211 and the yoke 4111 are integrally formed, and the tooth sleeve 411211 has a notch 41121b extending in the radial direction. The tooth core 411212 is disposed in the notch 41121b and is adapted to the notch 41121b. The tooth sleeve 411211 is made of non-oriented silicon steel, and the tooth core 411212 is made of oriented silicon steel. The tooth sleeve 411211 and the yoke 4111 are integrally punched and formed with non-oriented silicon steel, which reduces one connection process, reduces processing difficulty, and saves processing costs.

[0294] Since the yoke 4111 is in the two-dimensional magnetic field of the motor, the magnetic field direction is radial and circumferential, and the radial and circumferential saturation magnetic induction intensity performance is required to be excellent, which can fully utilize the characteristic of the non-oriented silicon steel material having the same saturation magnetic induction intensity in all directions.

[0295] It should be noted that the tooth core 411212 is made of oriented silicon steel with a radial rolling direction, and the tooth body 41121 is in the radial pulsating magnetic field of the motor. This magnetic field is a one-dimensional magnetic field, which only requires excellent saturation magnetic induction intensity performance in the radial direction. It fits the characteristic that the magnetism of oriented silicon steel has strong directionality, and utilizes the characteristics of oriented silicon steel with superior high saturation magnetic induction intensity, low hysteresis and low eddy current loss in the rolling direction that is easy to magnetize, thereby improving the overall saturation magnetic induction intensity of the iron core and reducing the hysteresis and eddy current loss of the iron core.

[0296] In some embodiments, as shown in FIG37 , the notch 41121b is sealed at the end away from the yoke 4111. Specifically, when the gear sleeve 411211 and the yoke 4111 are integrally punched and formed, the notch 41121b is sealed at the end away from the yoke 4111. This allows the tooth core 411212 to be well secured after entering the notch 41121b, thereby enhancing the tight connection between the gear sleeve 411211 and the tooth core 411212.

[0297] It should be noted that the length of the sealing section in the radial direction is adapted to the specifications of the tooth core 411212, which is sufficient to resist the radial force applied to the sealing section by the tooth core 411212, so that after the tooth core 411212 enters the slot 41121b, the tooth core 411212 fits tightly with the tooth sleeve 411211.

[0298] In some embodiments, as shown in FIG38 , the notch 41121b is open at the end away from the yoke 4111. Specifically, when the gear sleeve 411211 and the yoke 4111 are integrally punched, the notch 41121b is open at the end away from the yoke 4111, allowing the tooth core 411212 to radially enter the notch 41121b. Since the notch 41121b is open at the end away from the yoke 4111, the connection process between the gear sleeve 411211 and the tooth core 411212 is simplified, thereby improving the production efficiency of the combined punching sheet.

[0299] It should be noted that the width of the opening is adapted to the width of the slot 41121b and the tooth core 411212 , so that after the tooth core 411212 is placed in the slot 41121b , the tooth core 411212 is flush with the end surface of the tooth sleeve 411211 .

[0300] In some embodiments, as shown in FIG39 , the tooth core 411212 and the notch 41121b each have a matching vertex angle near the yoke 4111. Specifically, when the tooth sleeve 411211 and the yoke 4111 are integrally stamped and formed, the notch 41121b has a vertex angle matching that of the tooth core 411212 near the yoke 4111. This allows the tooth core 411212 to enter the notch 41121b and form a vertex-angled contact surface with the tooth sleeve 411211. When the magnetic field passes through the tooth core 411212 and enters the tooth sleeve 411211, the magnetic field lines are prevented from concentrating through the contact surface and entering the tooth sleeve 411211. As a result, the magnetic field has a smoother transition when passing through the tooth core 411212 and the tooth sleeve 411211, thereby reducing hysteresis loss.

[0301] It should be noted that the angle of the vertex angle can be selected within the range of 0° to 180°, so that the distances from the magnetic flux lines in the plane entering the tooth core 411212 to passing through the tooth core 411212 and entering the gear sleeve 411211 are not the same, so that the magnetic flux lines radially pass through the vertex contact surface in batches.

[0302] In some embodiments, as shown in Figure 40, the tooth core 411212 and the notch 41121b each have a matching flat angle near the yoke 4111. Specifically, when the tooth sleeve 411211 and the yoke 4111 are integrally punched and formed, the notch 41121b has a matching flat angle near the yoke 4111, ensuring smooth contact when the tooth core 411212 enters the notch 41121b, thus preventing friction that could cause a gap in the connection between the tooth core 411212 and the tooth sleeve 41121132.

[0303] It should be noted that the width of the flat angle section is consistent with the notch 41121b and the tooth core 411212, so that the tooth core 411212 fits tightly with the tooth sleeve 411211 after entering the notch 41121b.

[0304] In some embodiments, as shown in FIG41 , the tooth body 41121 is made of oriented silicon steel, and the yoke 4111 has a second connecting groove 4111a. The end of the tooth body 41121 closest to the yoke 4111 is disposed within the second connecting groove 4111a. The yoke 4111 is stamped from non-oriented silicon steel, and the second connecting grooves 4111a are spaced apart circumferentially along the yoke 4111. The shape of the second connecting grooves 4111a matches the end of the tooth body 41121 closest to the yoke 4111, ensuring a tight fit between the tooth body 41121 and the yoke 4111.

[0305] It should be noted that the tooth body 41121 is made of oriented silicon steel rolled in the radial direction, which fully utilizes the position advantage of the tooth body 41121 in the radial pulsating magnetic field of the motor and gives play to the excellent high saturation magnetic induction intensity, low hysteresis and low eddy current loss characteristics of the oriented silicon steel in its rolling direction.

[0306] In some embodiments, as shown in FIG42 , the tooth body 41121 is configured as a stack of oriented silicon steel sheets 41121c of unequal widths. The cross-section of the tooth body 41121 is trapezoidal, with the long base of the tooth body 41121 located on the side proximal to the yoke 4111. Specifically, the tooth slots 411a formed between two adjacent tooth bodies 41121 are parallel slots, enabling the use of formed coils to increase the motor's slot fill rate, boost motor power, and improve material utilization.

[0307] It should be noted that the tooth body 41121 is configured as a stacked arrangement of oriented silicon steel of unequal width, which can make the width of the tooth body 41121 closer to the yoke 4111 end larger, and the magnetic flux passing through the tooth body 41121 becomes correspondingly larger, thereby improving the noise, vibration and acoustic roughness (i.e. Noise, Vibration, Harshness, abbreviated as NVH) of the motor.

[0308] When oriented silicon steel sheets 41121c of unequal width are stacked, they are stacked in the circumferential direction. As shown in FIG47 , the widths of adjacent oriented silicon steel sheets 41121c are inconsistent, so that the edges of the stacked oriented silicon steel are uneven and stepped, thereby improving the heat dissipation capacity of the tooth body 41121 and reducing the hysteresis loss.

[0309] When oriented silicon steel sheets 41121c of unequal width are stacked, they are stacked in the axial direction. As shown in FIG48 , the width of the oriented silicon steel sheet 41121c gradually decreases as it moves away from the yoke 4111. After multiple oriented silicon steel sheets 41121c are stacked in the axial direction, their cross-section is trapezoidal, which reduces the processing difficulty and saves processing costs.

[0310] In some embodiments, as shown in FIG43 , the tooth core 411212 is configured as circumferentially stacked layers of grain-oriented silicon steel sheets 41121c. The thickness of the grain-oriented silicon steel sheets 41121c is less than the width of the slots 41121b, and the width of the grain-oriented silicon steel sheets 41121c is consistent with the thickness of the slots 41121b. The shape of the circumferentially stacked grains of grain-oriented silicon steel sheets 41121c is consistent with the shape of the slots 41121b, resulting in a smooth and flat outer surface of the tooth core 411212 after connection to the tooth sleeve 411211.

[0311] It should be noted that the tooth core 411212 is configured as oriented silicon steel sheets 41121c stacked in the circumferential direction, which reduces the deterioration of the oriented silicon steel caused by the combined punching processing stress and reduces the hysteresis and eddy current losses of the motor.

[0312] In some embodiments, as shown in FIG44 , the tooth core 411212 is configured as oriented silicon steel sheets 41121c stacked axially. The thickness of the oriented silicon steel sheets 41121c 301 is less than the thickness of the slots 41121b, the width of the oriented silicon steel sheets 41121c is consistent with the width of the slots 41121b, and the shape of the multiple oriented silicon steel sheets 41121c stacked axially is consistent with the shape of the slots 41121b, resulting in a smooth outer surface of the tooth core 411212 after connection to the tooth sleeve 411211.

[0313] It should be noted that the tooth core 411212 is configured as oriented silicon steel sheets 41121c stacked in an axial direction. The stacking direction is consistent with the punching direction of the yoke 4111, which reduces processing difficulty and saves processing costs.

[0314] In some embodiments, as shown in Figure 45, the tooth body 41121 is configured as a circumferentially stacked arrangement of oriented silicon steel sheets 41121c. Specifically, the circumferentially stacked oriented silicon steel sheets 41121c are adapted to the shape of the second connecting groove 4111a, resulting in a smooth and flat outer surface of the tooth body 41121 after connection with the yoke 4111.

[0315] In some embodiments, as shown in Figure 46, the tooth body 41121 is configured as axially stacked oriented silicon steel sheets 41121c. Specifically, the axially stacked oriented silicon steel sheets 41121c are adapted to the shape of the second connecting groove 4111a, resulting in a smooth outer surface of the tooth body 41121 after connection with the yoke 4111.

[0316] In some embodiments, referring to Figures 49 to 51 , the stator assembly 4 includes a stator core 41, a stator winding 42, and a stator bushing 61. The stator core 41 has teeth 4112 and slots 411a formed between the teeth 4112. The stator winding 42 is disposed in the slots 411a. The stator bushing 61 includes slot-filling portions 611 and connecting portions 612. The slot-filling portions 611 are disposed in the slots 411a of the stator core 41. The connecting portions 612 are connected to the slot-filling portions 611 in each slot 411a of the stator core 41 to form an annular integral body. The slot filling portion 611 in each tooth slot 411a forms a reinforcing rib along the axial direction of the stator core 41, and forms an annular sleeve with the connecting portion 612. The overall strength and sealing performance of the one-piece stator sleeve 61 are more excellent. While preventing dust, foreign matter and water vapor from entering the stator winding 42 through the tooth slot 411a, thereby improving the reliability of the insulation of the stator winding 42, it also reduces the risk of the stator sleeve 61 colliding with the high-speed rotating rotor due to deformation, thereby improving safety.

[0317] When the connecting part 612 is connected to the slot filling part 611 of each tooth slot 411a, the connection method can be to first set the slot filling part 611 of all the tooth slots 411a, and then set the connecting part 612, so that the connecting part 612 is fixedly connected to each slot filling part 611 to form an annular whole; or the slot filling part 611 can be first set in part of the tooth slots 411a, and after connecting the set slot filling part 611 with the connecting part 612, the remaining slot filling part 611 is set, and then the connecting part 612 is used to continue connecting, and so on, until the connecting part 612 connects all the slot filling parts 611 to form an annular whole.

[0318] It should be noted that the connection between the connecting portion 612 and the slot filling portion 611 of each tooth slot 411a can be adhesive, resin cured, a combination of multiple connections, or other forms of connection or combination connection.

[0319] In some embodiments, the slot-filling portion 611 may include a sealing unit 6111 and a filling unit 6112. Referring to FIG. 50 , when providing the slot-filling portion 611, a core mold having the same structure as the stator core 41 may be utilized, i.e., the core mold also includes teeth 4112 and slots 411a formed between the teeth 4112. The sealing unit 6111 is first inserted into the slots 411a from the inner surface of the core mold, followed by the filling unit 6112. Alternatively, the sealing unit 6111 and the filling unit 6112 may be combined before the slots 411a are inserted. The processed stator liner 61 is removed from the core mold, and the integrally formed stator liner 61 is installed on the stator core 41. Compared with the related art, in which the stator liner needs to be inserted and formed from the tooth slot side of the stator core, the stator liner 61 of the embodiment of the present application can reduce the design and processing costs of the stator liner 61 and the tooth portion 4112, and can also reduce the wear and scratches of the stator liner 61 by the tooth portion 4112 and the stator winding 42, thereby improving the sealing and strength of the stator liner 61.

[0320] It should be noted that the sealing unit 6111 may contact either the stator winding 42 or the teeth 4112 of the stator core 41, or may contact both the stator winding 42 and the teeth 4112. This allows the sealing unit 6111 to remain fixed relative to the stator winding 42 or the teeth 4112, separating the filling unit 6112 from the stator winding 42 or the teeth 4112, respectively.

[0321] It should be noted that the connection between the sealing unit 6111 and the filling unit 6112 can be adhesive, or the filling unit 6112 can be pressed tightly against the tooth portion 4112 by the pressure generated by the filling, or other forms of connection. The connection between the sealing unit 6111 and the filling unit 6112 can better secure the sealing unit 6111 and the filling unit 6112 within the tooth slots 411a of each core mold, thereby preventing the sealing unit 6111 and the filling unit 6112 from loosening and falling out during the manufacturing process of the stator liner 61.

[0322] In some embodiments, please refer to Figure 50, when the stator sleeve 61 is processed in the core mold, when the filling unit 6112 fills the tooth slot 411a, the filling degree can be that the filling unit 6112 is flush with the top of the tooth portion 4112, or the filling unit 6112 is slightly higher than the top of the tooth portion 4112, to ensure that when the connecting portion 612 is subsequently covered on the slot filling portion 611, the filling unit 6112 can more fully contact the connecting portion 612, thereby making the overall sealing and strength of the stator sleeve 61 better.

[0323] It should be noted that, in order to improve the sealing performance of the stator liner 61, the sealing unit 6111 can contact the inner walls of the teeth 4112 on both sides near the connecting portion 612. On this basis, the sealing unit 6111 can extend to the top surface of the teeth 4112, or terminate somewhere on the inner walls of the teeth 4112 on both sides near the connecting portion 612.

[0324] It is understood that when the sealing unit 6111 extends to the surface where the top of the tooth portion 4112 is located, the sealing unit 6111 can contact the surface where the top of the tooth portion 4112 is located, thereby separating the surface where the top of the tooth portion 4112 is located from the connecting portion 612. Depending on the extent of extension of the sealing unit 6111, the connecting portion 612 and the surface where the top of the tooth portion 4112 is located can be completely separated or partially separated.

[0325] Specifically, if the connection portion 612 is completely separated from the surface where the top of the tooth portion 4112 is located by the sealing unit 6111, the connection portion 612 is connected to the sealing unit 6111 and does not contact the surface where the top of the tooth portion 4112 is located. If the connection portion 612 is not completely separated from the surface where the top of the tooth portion 4112 is located, the connection portion 612 is both connected to the sealing unit 6111 and also contacts the surface where the top of the tooth portion 4112 is located.

[0326] When the sealing unit 6111 ends at a point on the inner walls of the teeth 4112 near the connecting portion 612, the connecting portion 612 contacts the top surface of the teeth 4112, and the connecting portion 612 is connected to the filling unit 6112, but not to the sealing unit 6111. The filling unit 6112 fills the teeth 4112 not covered by the sealing unit 6111 and contacts the teeth 4112.

[0327] In some embodiments, referring to FIG. 50 , the sealing unit 6111 may be a stack of multiple or single sealing layers, the filling unit 6112 may be a stack of multiple or single filling layers, and the connecting portion 612 may be a stack of multiple or single connecting layers.

[0328] It should be noted that the sealing layers, the filling layers, and the connecting layers can be connected by bonding, by resin curing, by a combination of multiple connections, or by other forms of connection or combination connections.

[0329] It should be noted that the sealing layer can be an impregnated fiber cloth strip or other forms, the filling layer can be an impregnated fiber rope or other forms, and the connecting layer can be an impregnated fiber cloth or other forms.

[0330] Specifically, the connecting layer can be a single impregnated fiber cloth that completely covers the surface of the inner ring of the core, or multiple impregnated fiber cloths that completely cover the inner ring of the core.

[0331] It should be noted that the thickness of the connecting portion 612 and the connecting layer needs to be determined according to the gap between the stator and rotor of the motor. In some embodiments, in order to reduce the difficulty of manufacturing the stator liner 61, the connecting layer is usually set to a preset thickness, which can be 0.3 mm or other specifications.

[0332] In some embodiments, the sealing unit 6111 , the filling unit 6112 and the connecting portion 612 respectively include a reinforcing material (not shown) and a base material (not shown). The reinforcing material is impregnated in the base material.

[0333] Specifically, the reinforcement material can be a polymer material. For example, the reinforcement material can be glass fiber, carbon fiber, aramid fiber, or a combination of multiple polymer materials. The low thermal conductivity polymer material used in the reinforcement material, through the structure of the stator liner 61 (see Figure 51), can form an orderly heat dissipation channel, blocking the mutual transfer of heat between the stator and rotor of the motor, creating an independent heat exchange space between the stator and rotor, and providing significant design space for improving motor efficiency.

[0334] Specifically, the matrix material may be a high molecular polymer, for example, a thermosetting resin.

[0335] It should be noted that if a magnetic stator liner 61 is required, a magnetic material may be added to the base material, that is, the base material may be a combination of a thermosetting resin and a magnetic material.

[0336] In some embodiments, referring to Figures 52 to 54 , the rotor core 51 includes a main body of stampings, a magnetic isolation bridge 53, and permanent magnets 54. The main body of stampings includes a plurality of stacked rotor stampings 511. The rotor stampings 511 are arranged in an annular shape and have a plurality of first slot groups 512 spaced circumferentially therefrom. Each first slot group 512 includes a pair of first slots 513 symmetrically arranged along the D axis. A magnetic isolation bridge 53 is spaced between the pair of first slots 513 in each first slot group 512, forming an internal magnetic isolation bridge 53 on the rotor stamping 511 between the inner ends of the pair of first slots 513. A permanent magnet 54 is disposed within the first slot 513 of each stacked rotor stamping 511. Each permanent magnet 54 includes a magnetic body 541 and an insulating layer 542. The insulating layer 542 is disposed on the side of the magnetic body 541 that is closer to the D axis.

[0337] The D-axis is the direct axis and lies on the centerline of the rotor poles. The Q-axis is the quadrature axis and lies on the perpendicular bisector between two adjacent poles. Specifically, as shown in Figure 53 , the direction from the axis of the rotor sheet 511 toward the center of the first slot group 512 is the D-axis direction of the motor, while the direction from the axis of the rotor sheet 511 toward the boundary between the two first slot groups 512 is the Q-axis direction.

[0338] Since the insulating layer 542 is arranged on the side of the magnetic body 541 close to the D axis, an asymmetric air gap is generated between the magnetic body 541 on the side close to the D axis and the first slot 513. The asymmetric air gap causes the magnetic body 541 to be subjected to uneven magnetic pulling force. The uneven magnetic pulling force adsorbs the magnetic body 541 on the side of the Q axis, reducing the centrifugal force applied by the magnetic body 541 to the magnetic isolation bridge 53 when the motor runs at high speed, reducing the fracture and damage of the magnetic isolation bridge 53 when the motor runs at high speed, thereby improving the safety of the motor when running at high speed.

[0339] At the same time, the centrifugal force applied by the magnetic body 541 to the magnetic isolation bridge 53 when the motor is running at high speed is reduced. On the one hand, it can reduce the strength requirement of the rotor punching 511 on the magnetic isolation bridge 53, reduce the thickness of the magnetic isolation bridge 53, reduce the magnetic leakage of the permanent magnet 54, reduce the use of high-performance permanent magnetic materials, improve the utilization rate of materials, and reduce manufacturing costs; on the other hand, it can increase the mechanical speed of the motor, improve the power and power density of the motor, and achieve high-efficiency performance using the same materials.

[0340] In some embodiments, the first slot group 512 includes a pair of first slots 513 symmetrically arranged along the D axis. The pair of first slots 513 are inclined away from each other along the D axis, forming a V-shape with the opening facing away from the axis. The V-shaped arrangement of the first slots 513 provides a magnetic flux concentrating effect, widening the armature reaction quadrature-axis loop channel, allowing more magnetic flux to converge into the working air gap between the stator and rotor, thereby improving the motor's operating efficiency. Furthermore, the V-shaped arrangement of the first slots 513 reduces the DC component of the electromagnetic force in the rotor core 51, thereby reducing vibration and deformation during motor operation and improving the motor's safety during high-speed operation.

[0341] In some embodiments, as shown in FIG55 , the first slot 513 includes a seating slot 5131 and a dovetail slot 5132. The seating slot 5131 is used to accommodate the permanent magnet 54. The dovetail slot 5132 is connected to the seating slot 5131. The two ends of the seating slot 5131 protrude from the two ends of the dovetail slot 5132 to form air slots 513a. The dovetail slot 5132 is used to secure the permanent magnet 54. The dovetail slot 5132 is located on the side of the first slot 513 near the Q axis. The dovetail slot 5132 is trapezoidal in shape, with the long base of the trapezoid located near the Q axis. The shape of the permanent magnet 54 near the Q axis matches the dovetail slot 5132, so that the permanent magnet 54 fits tightly against the dovetail slot 5132 when entering the first slot 513. The trapezoidal shape of the dovetail slot 5132 limits the displacement of the permanent magnet 54, thereby reducing the centrifugal force exerted by the permanent magnet 54 on the magnetic isolation bridge 53 during high-speed operation of the motor.

[0342] It should be noted that the two ends of the seating groove 5131 protrude from the two ends of the dovetail groove 5132, and an air groove 513a is formed between the protruding part and the permanent magnet 54 placed inside the seating groove 5131. The air groove 513a can reduce magnetic leakage and improve the working efficiency of the motor.

[0343] In some embodiments, as shown in Figures 54 and 56 , the cross-section of the magnetic body 541 is trapezoidal, with the long base of the magnetic body 541 positioned on the side away from the D-axis. The magnetic body 541 is made of a high-performance permanent magnet material, which can be an alloy permanent magnet material, a ferrite permanent magnet material, or a rare earth permanent magnet material, to provide the excitation magnetic field required for motor operation.

[0344] It should be noted that the long bottom edge of the magnetic body 541 is set on the side away from the D axis, so that the contact area between the magnetic body 541 and the Q axis side is increased, the adsorption effect of the uneven magnetic pull on the magnetic body 541 is increased, and the magnetic body 541 is adsorbed on the side close to the Q axis, thereby reducing the influence of the magnetic body 541 on the D axis.

[0345] In some embodiments, as shown in Figures 54 and 56, the insulating layer 542 is connected to the magnetic body 541 by bonding. The insulating layer 542 is adapted to the side of the magnetic body 541 close to the D axis, so that the end faces of the insulating layer 542 and the magnetic body 541 are flush after being connected. Furthermore, an adhesive is applied to the side of the insulating layer 542 away from the D axis and / or the side of the magnetic body 541 close to the D axis, so that the insulating layer 542 is tightly connected to the magnetic body 541. Furthermore, the magnetic body 541 is provided with a groove 5411 on the side close to the D axis, and the groove 5411 contains an adhesive to enhance the connection strength between the insulating layer 542 and the magnetic body 541.

[0346] It should be noted that the shapes of the seating groove 5131 and the dovetail groove 5132 are adapted to the shape of the magnetic body 541 after being bonded to the insulating layer 542, so that after the permanent magnet 54 enters the first groove 513, the long bottom side and the short bottom side of the permanent magnet 54 are tightly fitted with the first groove 513.

[0347] Since the insulating layer 542 is connected to the magnetic body 541 by bonding, the air gap between the side of the magnetic body 541 close to the D-axis and the first slot 513 is further increased, causing the magnetic resistance of the rotor punching 511 at the D-axis to increase, reducing the impact of the demagnetization current on the magnetic body 541, reducing the risk of irreversible demagnetization of the magnetic body 541 during operation, and improving the safety of the motor when running at high speed.

[0348] In some embodiments, as shown in FIG56 , the insulating layer 542 is a tetrafluoroethylene sheet. The thickness of the insulating layer 542 can be varied according to actual needs. The thicker the insulating layer 542, the larger the air gap between the magnetic body 541 and the first slot 513. This increases the uneven magnetic pull on the magnetic body 541 and the strength with which the magnetic body 541 is attracted to the Q axis, further reducing the centrifugal force exerted by the permanent magnet 54 on the magnetic isolation bridge 53 during high-speed operation of the motor.

[0349] In some embodiments, as shown in FIG57 , the rotor punching 511 has multiple lightening holes 531 in the middle. These holes not only reduce magnetic flux leakage and improve motor performance, but also reduce the weight of the rotor punching 511 and increase material utilization. The holes 531 are symmetrically arranged, with the same number of holes 531 within each first slot group 512, ensuring structural strength at every location on the rotor punching 511.

[0350] In some embodiments, as shown in FIG57 , a weight-reducing hole 531 is provided inside the magnetic isolation bridge 53. While ensuring the strength of the magnetic isolation bridge 53, the weight-reducing hole 531 can significantly reduce the thickness of the magnetic isolation bridge 53, thereby improving the magnetic isolation performance of the magnetic isolation bridge 53 and enhancing the working efficiency of the motor.

[0351] In some embodiments, as shown in Figures 53 and 57 , the weight-reducing holes 531 can be quadrilateral, triangular, elliptical, or circular. It is understood that the corresponding weight-reducing holes 531 on each rotor punching 511 penetrate to form the first cooling channel 5a and / or the second cooling channel 5b. When the rotor core 51 rotates, air passes through the cooling channels to cool the rotor, reducing the risk of rotor demagnetization due to excessive temperature and improving the safety of the motor during high-speed operation.

[0352] In some embodiments, as shown in FIG57 , the first slot 513 is spaced apart from the outer circumference of the rotor sheet 511 to form a magnetic isolation bridge 53 on the outer circumference. The magnetic isolation bridge 53 on the outer circumference is not affected by the magnetic body 541 and can be set to a relatively small thickness. The relatively small thickness allows the magnetic isolation bridge 53 to have an excellent magnetic isolation effect.

[0353] In some embodiments, as shown in FIG58 , the rotor core 511 further includes a reinforcing magnetic shield 533. The rotor laminations 511 also have a second slot 532 located between the inner ends of a pair of first slots 513. The reinforcing magnetic shield 533 is located within the second slot 532. The reinforcing magnetic shield 533 is made of high-strength structural steel that is non-magnetic, enhancing the rotor's strength. Furthermore, the reinforcing magnetic shield 533 is shaped to match the second slot 532, ensuring a tight fit upon entry.

[0354] It should be noted that when the reinforcing magnetic isolation member 533 is not placed in the second slot 532, as shown in Figure 57, since the second slot 532 is located between the inner ends of a pair of first slots 513, it is equivalent to the weight-reducing hole 531, which reduces the thickness of the magnetic isolation bridge 53 between the first slots 513 on both sides, improves the magnetic isolation capacity of the magnetic isolation bridge 53, increases the utilization rate of the material, and improves the working efficiency of the motor.

[0355] In some embodiments, the magnetic body 541 (or referred to as a magnetic steel in this application) includes a magnetic steel body 5413 and a filling portion 5412. Referring to Figures 59 and 60, the magnetic steel body 5413 includes a comb back 54131 and a plurality of comb teeth 54132. Comb tooth grooves 5413a are provided between adjacent comb teeth 54132. The comb teeth 54132 are spaced apart along the length, and a row of comb teeth 54132 is provided at each end of the comb back 54131 along the width. The comb teeth 54132 and the comb back 54131 are integrally processed to form a comb-like structure. The filling portion 5412 fills the comb tooth grooves 5413a to enhance the insulation performance between adjacent comb teeth 54132.

[0356] It should be noted that the cross-section of the magnetic body 5413 may be rectangular or trapezoidal. In some embodiments of the present application, the cross-section of the magnetic body 5413 is trapezoidal.

[0357] It should be noted that the comb teeth 54132 and the comb back 54131 are integrally processed to form a comb-shaped magnetic steel body 5413, and the partial cutting replaces the complete cutting of the magnetic steel in the related art, thereby reducing the cutting waste of the magnetic steel body 5413 during processing and reducing the cost of the magnetic steel material in the manufacturing process.

[0358] In the related art, when bonding the pre-cut magnetic bodies together, a mold is required to standardize the overall shape of the bonded magnetic bodies. In the embodiment of the present application, the magnetic body 5413 is a comb-shaped structure formed by integral processing. There is no need to bond the pre-cut magnetic bodies together. Only the insulating adhesive needs to be filled into the comb grooves 5413a through a dipping process. This reduces the difficulty of bonding the magnetic bodies 5413 together in the related art and reduces the processing cost of the magnetic body 5413.

[0359] In addition, in the related art, after the independent magnetic bodies are bonded, the bonded magnetic assembly needs to be processed in terms of external dimensions. However, in the embodiment of the present application, the magnetic body 5413 is not cut into independent small segments. After the magnetic body 5413 is combined with the filling portion 5412, there is no need for overall processing, which reduces the processing steps, reduces the processing cost, and improves the manufacturing efficiency of the magnetic steel.

[0360] It should be noted that the direction of the comb-tooth grooves 5413a can be parallel to the width direction of the magnetic body 5413, or can form a certain angle with the width direction of the magnetic body 5413. The purpose of the comb-tooth grooves 5413a is to reduce the volume at both ends of the magnetic body 5413, which is beneficial for subsequent heavy rare earth coating treatment and improves the performance of the magnetic body 5413. Therefore, the shape and width of the comb-tooth grooves 5413a are not limited here.

[0361] Typically, the cross-section of the magnetic steel is designed to be rectangular. It is installed on the rotor core or stator core of the motor. The upper and lower surfaces of the magnetic steel align with the upper and lower surfaces of the magnetic steel slots in the core. The distance between the upper and lower surfaces of the magnetic steel is called the thickness or height of the magnetic steel, and the depth of the magnetic steel within the magnetic steel slot along the axial direction of the core is called the length of the magnetic steel. Taking Figure 53 as an example, the permanent magnet 54 is in the first slot 513 (i.e., the magnetic steel slot). The distance between the upper and lower surfaces of the permanent magnet 54 is called the thickness or height of the permanent magnet 54, and the depth of the permanent magnet 54 within the first slot 513 along the axial direction of the rotor core 51 is called the length of the permanent magnet 54. In the description of the embodiments of this application, the terms "width direction," "length direction," "height direction," etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in Figure 59.

[0362] It is understood that the depths of the comb-tooth grooves 5413a at both ends of the magnetic body 5413 along the width direction can be the same or different. In the embodiment of the present application, the depths of the comb-tooth grooves 5413a at the left and right ends of the magnetic body 5413 are the same, which is one-fourth of the width of the magnetic body 5413.

[0363] Referring to Figures 59 and 60 , the filling portions 5412 filling the comb-tooth grooves 5413a of the magnetic body 5413 increase the electrical resistance between the multiple comb teeth 54132, enhancing the insulation between the multiple comb teeth 54132 while maintaining the overall strength of the magnetic body 541. The alternating arrangement of the comb teeth 54132 and the filling portions 5412 reduces eddy current losses in the comb portion of the magnetic body 541, thereby lowering the overall operating temperature of the magnetic body.

[0364] For example, the filling portion 5412 may be insulating glue, and the filling portion 5412 is formed in the comb groove 5413a by a glue dipping process or a glue brushing process.

[0365] It should be noted that, in order to improve the demagnetization resistance of the magnetic body 541, in some embodiments of the present application, the magnetic body 5413 may undergo a grain boundary diffusion treatment of heavy rare earth elements, thereby increasing the magnetic field strength of the magnetic body 5413. In other embodiments of the present application, the grain boundary diffusion treatment of heavy rare earth elements is performed only on the comb teeth 54132 of the magnetic body 541, which are more prone to demagnetization, while the comb back 54131 does not require this treatment. Performing the heavy rare earth diffusion treatment only on the comb teeth 54132 reduces the amount of heavy rare earth elements used, thereby lowering the manufacturing cost of the magnetic body 541.

[0366] It should be noted that, referring to Figures 33 to 60, the stator assembly 4 reduces energy loss by using a stator core 41 composed of different materials, and the rotor assembly 5 increases the mechanical speed through dovetail permanent magnets. By changing the structures of the rotor assembly 5 and the stator assembly 4, the motor can generate less loss and make better use of materials under higher electromagnetic load conditions.

[0367] The above is only a preferred specific implementation method of the embodiment of the present application, but the scope of protection of the present application is not limited to this. Any technician familiar with this technical field, within the technical scope disclosed in this application, can make equivalent replacements or changes based on the technical solutions of the embodiments of the present application and the concepts of the embodiments of the present application, which should be covered by the scope of protection of the present application.

Claims

1. A motor, comprising: Machine base; A first end cover, disposed at one end of the base and connected to the base; A second end cover, disposed at the other end of the base and connected to the base; A stator assembly is disposed in the base and connected to the base; a rotor assembly having a first cooling channel extending in the axial direction, wherein the rotor assembly is disposed in the base and is rotatably connected to the first end cover and the second end cover respectively; and The rotor assembly, the machine base and the first end cover are arranged to form a first accommodating cavity, the rotor assembly, the machine base and the second end cover are arranged to form a second accommodating cavity, and the first cooling channel connects the first accommodating cavity and the second accommodating cavity to form an internal cooling channel.

2. According to the motor of claim 1, there are multiple first cooling channels, which are divided into two groups and arranged on the rotor assembly, one group of first cooling channels are arranged at intervals on the first circumference of the rotor assembly, and the other group of first cooling channels are arranged at intervals on the second circumference of the rotor assembly, and the radius of the first circumference is greater than the radius of the second circumference.

3. The electric machine according to claim 1, wherein the rotor assembly further comprises a second cooling channel extending in the axial direction; A first cavity communicating with the outside is formed in the first end cover, and a second cavity communicating with the outside is formed in the second end cover; The second cooling channel communicates with the first cavity and the second cavity to form an external cooling channel.

4. The motor according to claim 3, wherein there are multiple external cooling channels, multiple second cooling channels are spaced apart on the third circumference of the rotor assembly, multiple first cavities are spaced apart on the first end cover corresponding to the second cooling channels, and multiple second cavities are spaced apart on the second end cover corresponding to the second cooling channels.

5. The motor according to claim 3, wherein the first end cover comprises a first cover body and a first sealing ring, the first sealing ring is connected to the rotor assembly and can rotate with the rotor assembly, and the first sealing ring overlaps the first cover body; the second end cover comprises a second cover body and a second sealing ring, the second sealing ring is connected to the rotor assembly and can rotate with the rotor assembly, and the second sealing ring overlaps the second cover body; The first sealing ring has a first air hole, and the second sealing ring has a second air hole; the first cover body has a first channel connected to the outside, and the second cover body has a second channel connected to the outside; the first channel and the first air hole are connected to form the first cavity, and the second channel and the second air hole are connected to form the second cavity.

6. The motor according to claim 5, wherein the first cover has a first outer chamber with a first opening, the first sealing ring seals the first opening, and the first outer chamber communicates with each of the first air holes and each of the first channels; The second cover body has a second outer chamber with a second opening, the second sealing ring seals the second opening, and the second outer chamber is connected to each of the second air holes and each of the second channels.

7. The motor according to claim 6, comprising fan blades, is disposed on a side of the first sealing ring facing the first outer chamber; and / or, is arranged on a side of the second sealing ring facing the second outer chamber; and / or, is disposed on a side of the first sealing ring facing the first accommodating cavity; and / or, The second sealing ring is arranged on a side facing the second accommodating cavity.

8. The electric machine of claim 1, further comprising an isolation barrier disposed between the stator assembly and the rotor assembly; The rotor assembly, the isolation barrier and the first end cover are arranged to form a first inner chamber, the rotor assembly, the isolation barrier and the second end cover are arranged to form a second inner chamber, and the first cooling channel connects the first inner chamber and the second inner chamber to form the internal cooling channel.

9. According to the motor of claim 8, the isolation barrier comprises a stator sleeve, an isolation ring and a sealing ring, the axial ends of the stator sleeve are respectively connected to the isolation rings, wherein the isolation ring and the first end cover at one end are connected by one sealing ring, and the isolation ring and the second end cover at the other end are connected by another sealing ring.

10. The motor according to claim 9, wherein the isolation ring comprises an insulation member, an aerogel and an insulation tube, the aerogel is arranged between the isolation member and the insulation tube, and the insulation tube is arranged facing the rotor assembly and connected to the corresponding sealing ring.

11. The motor according to claim 1, wherein the base comprises: A main cylinder body, wherein the inner wall of the main cylinder body is processed circumferentially to form a third cooling channel with an inner side open, and both ends of the third cooling channel are respectively connected to the outside; as well as, The inner cylinder is nested in the main cylinder to close the open third cooling channel.

12. The motor according to claim 11, wherein the main cylinder comprises: outer cylinder; The auxiliary device includes an upper hanging, a lower hanging, a safety bracket and a junction box base, which are arranged on the outer peripheral side of the outer cylinder; as well as, An interface device, comprising a first interface and a second interface, which are arranged on the outer peripheral side of the outer cylinder, wherein the first interface and the second interface are respectively communicated with two ends of the third cooling channel; Wherein, the auxiliary device and the interface device are integrally cast with the outer cylinder.

13. The motor according to claim 12, wherein the main cylinder further comprises a reinforcing structure integrally cast with the outer cylinder, wherein the reinforcing structure is disposed adjacent to the auxiliary device and extends along the axial direction of the outer cylinder to both ends of the outer cylinder.

14. The motor according to claim 12, wherein the base further comprises a dustproof plate, and the dustproof plate is welded to the upper suspension.

15. The electric machine according to claim 1, wherein the rotor assembly comprises a rotor core, wherein the rotor core comprises: A lamination body, comprising a plurality of rotor laminations stacked in layers and configured in an annular shape, wherein a plurality of first slot groups are arranged at intervals along the circumferential direction of the lamination body, and each of the first slot groups comprises a pair of first slots symmetrically arranged along the D axis of the motor; A magnetic isolation bridge is arranged between the pair of first grooves to form an internal magnetic isolation bridge on the punching sheet body between the inner ends of the pair of first grooves; and A permanent magnet is disposed in the first slot; wherein the permanent magnet includes a magnetic body and an insulating layer, and the insulating layer is disposed on a side of the magnetic body close to the D axis.

16. The electric machine according to claim 15, wherein the first slot comprises: A placement slot, used to accommodate the permanent magnet; as well as A dovetail groove is connected to the placement groove, two ends of the placement groove protrude from two ends of the dovetail groove, and the dovetail groove is used to fix the permanent magnet. 17 . The motor according to claim 15 , wherein the cross section of the magnetic body is a trapezoid, and the long bottom side of the magnetic body is arranged at a side away from the D axis.

18. The motor according to claim 15, wherein the first groove is spaced apart from the outer circumferential edge of the punching sheet body to form the magnetic isolation bridge of the outer circumferential edge.

19. The electric machine of claim 15, wherein the magnetic body comprises: A magnetic steel body, comprising a comb back and a plurality of comb teeth arranged at intervals along the length direction of the comb back, the comb teeth are arranged at both ends along the width direction of the comb back, and comb tooth grooves are formed between adjacent comb teeth; and, The filling part is filled in the comb tooth groove.

20. The motor according to claim 19, wherein the comb teeth are infiltrated with heavy rare earth; and / or the filling portion is insulating glue.

21. The motor according to claim 1, wherein the stator assembly comprises a stator core, wherein the stator core comprises a plurality of stator punching sheets stacked in layers, wherein the stator punching sheets comprise: a yoke configured in a ring shape; A plurality of tooth bodies are arranged at intervals along the inner side of the yoke in the circumferential direction, and one end of the tooth body is connected to the yoke; as well as Tooth shoe, the other end of each tooth body is connected to the corresponding tooth shoe; Wherein, the tooth body and the yoke are both made of silicon steel material, and the tooth shoe is made of amorphous alloy material.

22. The motor according to claim 21, wherein the tooth shoe has a first connecting groove, and an end of the tooth body away from the yoke is arranged in the first connecting groove; or, The tooth body has a concave groove, and the tooth shoe has a convex portion, and the convex portion is arranged in the concave groove.

23. The motor according to claim 21, wherein the tooth body comprises: A gear sleeve, formed integrally with the yoke, the gear sleeve having a notch extending in the radial direction; as well as, A tooth core is disposed in the notch and adapted to the notch; Wherein, the gear sleeve is made of non-oriented silicon steel, and the gear core is made of oriented silicon steel.

24. The motor according to claim 23, wherein the slot is open or closed at one end away from the yoke; or, The tooth core and the notch respectively have adapted vertex angles or flat angles near the yoke.

25. The motor according to claim 23, wherein the tooth core is configured as oriented silicon steel sheets stacked in a circumferential direction or in an axial direction.

26. The motor according to claim 21, wherein the tooth body is made of oriented silicon steel, the yoke has a second connecting groove, and one end of the tooth body close to the yoke is arranged in the second connecting groove.

27. The motor according to claim 26, wherein the tooth body is configured as a stack of oriented silicon steel sheets of unequal width, the cross-section of the tooth body is trapezoidal, and the long bottom side of the tooth body is located on a side close to the yoke.

28. The motor according to claim 1, wherein the stator assembly comprises the stator core, the stator winding and the stator bushing, wherein the stator core has teeth and slots formed between the teeth, and the stator winding is wound around the slots; and the stator bushing comprises: A slot filling portion is arranged in the tooth slot of the stator core; as well as, A connecting portion, connected to the slot filling portions in each of the tooth slots of the stator core, to form an annular whole; Wherein, the groove filling portion and the connecting portion are integrally formed.

29. The electric machine according to claim 28, wherein the slot-filling portion comprises: a sealing unit, disposed in the tooth groove; and A filling unit, filled in the tooth groove and connected to the sealing unit; The sealing unit is used to separate the filling unit from the stator winding and the teeth of the stator core, respectively, and the connecting portion is connected to the sealing unit and the filling unit in each tooth slot, respectively; or, The sealing unit is used to separate the filling unit from the stator winding and the teeth of the stator core respectively, and the connecting portion is connected to the filling unit in each of the tooth slots.

30. The motor according to claim 29, wherein the sealing unit comprises a plurality of sealing layers stacked together, or the sealing unit is a single sealing layer; and / or, The filling unit includes a plurality of stacked filling layers, or the filling unit is a single filling layer; and / or, The connecting portion includes a plurality of stacked connecting layers, or the connecting portion is a single connecting layer.

31. The motor according to claim 29, wherein the sealing unit, the filling unit and the connecting portion respectively comprise a reinforcing material and a matrix material, and the reinforcing material is impregnated in the matrix material; wherein, The reinforcing material is a polymer material, and the matrix material includes a thermosetting resin and / or a magnetic material.

32. The motor according to claim 1 further comprises a heat conductive member, the stator assembly comprises a stator core and a stator winding, the stator winding has winding ends extending from both axial ends of the stator core; the heat conductive member is arranged between the winding ends at both ends and the machine base, for transferring the heat generated by the winding ends to the machine base.

33. The motor according to claim 32, wherein the heat conductive member comprises a first heat conductive sleeve and a phase change temperature equalizing component, wherein the first heat conductive sleeve is connected to the base, and the phase change temperature equalizing component is arranged on the side of the first heat conductive sleeve facing the winding end, and the phase change temperature equalizing component surrounds at least a portion of the winding end.

34. The motor according to claim 33, the heat conductive member further comprises a first fixing fastener, the first heat conductive sleeve is connected to the phase change temperature equalizing component via the first fixing fastener, one end of the first fixing fastener is connected to the first heat conductive sleeve, a first groove is formed between the other end of the first fixing fastener and the first heat conductive sleeve, and the phase change temperature equalizing component is arranged in the first groove.

35. The motor according to claim 34, wherein the first heat-conducting sleeve and the phase-change temperature-averaging component are both in a cylindrical shape, a plurality of the first fixing fasteners are arranged in a cylindrical shape, the other ends of the plurality of the first fixing fasteners arranged in a cylindrical shape form a first expansion opening, and the phase-change temperature-averaging component is sleeved outside the first expansion opening.

36. The motor according to claim 35, wherein the first expansion periphery has a third boss, and the phase change temperature equalizing component is sleeved on the third boss.

37. The motor according to claim 33, the phase change temperature equalizing component comprises a heat sink and a phase change tube, one end of the heat sink is bent to form a second groove, one end of the phase change tube is arranged in the second groove, the phase change tube faces the winding end, and the heat sink is connected to the first heat conductive sleeve.

38. According to the motor described in claim 37, the phase change temperature equalizing component also includes a second fixing fastener, there are multiple heat sinks, two adjacent heat sinks are connected by the second fixing fastener, and the multiple heat sinks are connected into a cylindrical shape.

39. According to the motor of claim 38, the second fixing fastener is H-shaped with receiving grooves on both sides, and the heat sink is located in the receiving grooves of the second fixing fastener; a single heat sink has a plurality of phase change tubes arranged side by side.

40. The motor according to claim 32, wherein the heat conductive member comprises a second heat conductive sleeve and a heat conductive ring, the second heat conductive sleeve is connected to the machine base, the second heat conductive sleeve is axially connected to the heat conductive ring, and the heat conductive ring surrounds at least a portion of the winding end.

41. The electric machine according to claim 32, wherein the gap between the heat conducting member and the winding end is filled with a heat conducting medium; and / or, The gaps between the wires constituting the winding ends are filled with a heat-conducting medium.

Images