Water-cooling outer rotor flat wire winding motor

Abstract

The utility model relates to a water-cooling outer rotor flat wire winding motor, belongs to the technical field of motors, and solves the problems of low slot fullness rate and high stray inductance caused by using round wire parallel winding fractional slot concentrated windings in the prior art. The motor comprises a stator assembly, a rotor assembly, a bearing and a water cooling system, and the stator assembly is located on the radial inner side of the rotor assembly; a bearing cover and an outer ring of the bearing are fixedly connected with the stator assembly, and an inner ring of the bearing is fixedly connected with the rotor assembly; the stator assembly comprises a stator base, an iron core assembly and a stator sealing piece, the iron core assembly is fixedly arranged on the stator base, the iron core assembly is of a partitioned structure and comprises a plurality of tooth parts, yoke parts and windings, and the windings are flat wire windings; the water cooling system is disposed adjacent to the stator assembly. According to the utility model, the block type stator and the flat wire winding are used for the external rotor motor, the slot space factor of the motor is improved, the copper loss of the motor is reduced, and the three-phase consistency of the inductance of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a water-cooled outer rotor flat wire winding motor. Background Art

[0002] Existing motors mostly use round wire and fractional slot concentrated windings, which have low slot fill rate and high stray inductance, resulting in a high proportion of copper loss. When the power of the motor increases, the heat dissipation effect of the motor winding is poor, and the operating power of the motor is greatly limited.

[0003] The existing motors are produced by integrated production, which easily wastes raw materials and increases costs.

[0004] Most existing motors use direct radial or parallel magnetization, and the waveform of the air gap flux density is chaotic.

[0005] In the prior art, the outer diameter of the stator of the outer rotor motor is usually relatively large, and the roughness of the stator core is relatively high, so it is difficult to seal. It is difficult to design a stator seal using direct water cooling of the winding.

[0006] Flat wire windings generally need to be welded and installed into the motor. For small-batch motors, how to quickly and conveniently install the windings on the core teeth is also a problem that needs to be solved. Utility Model Content

[0007] In view of the above analysis, the embodiment of the utility model aims to provide a water-cooled outer rotor flat wire winding motor to solve the problem of low slot fill rate and high stray inductance in the prior art of using round wire and fractional-slot concentrated winding.

[0008] On the one hand, the utility model provides a water-cooled outer rotor flat wire winding motor, comprising a stator assembly, a rotor assembly, a bearing and a water cooling system, wherein the stator assembly is located radially inward of the rotor assembly; the bearing cover and the outer ring of the bearing are fixedly connected to the stator assembly, and the inner ring of the bearing is fixedly connected to the rotor assembly; the stator assembly comprises a stator seat, an iron core assembly and a stator seal, the iron core assembly is fixedly arranged on the stator seat, and the iron core assembly is a block structure; the water cooling system is arranged adjacent to the stator assembly, and the water cooling system is used to cool the stator assembly.

[0009] Furthermore, the core assembly includes a plurality of teeth, a yoke and a winding, and the assembly sequence of the core assembly is to fix the winding on the teeth and then fix the teeth on the yoke.

[0010] Furthermore, the winding is a flat wire winding, and the winding is wound with flat copper wire.

[0011] Furthermore, the rotor assembly includes a yoke and a permanent magnet assembly, the yoke is an annular body, and the permanent magnet assembly is fixedly arranged on the inner circumferential surface of the yoke.

[0012] Furthermore, the permanent magnet assembly is surface mounted and uses a Halbach array or a directly magnetized permanent magnet.

[0013] Furthermore, the water cooling system includes an input port, a flow diversion component, a fluid groove, a winding sealing cavity and an output port connected in sequence; wherein the coolant enters the motor from the input port and leaves the motor from the output port.

[0014] Further, the input port is arranged on the bearing cover and extends in the axial direction; a stator end seal is arranged at one end of the winding sealing cavity, and the output port is arranged on the end surface of the stator end seal.

[0015] Furthermore, the flow splitter assembly comprises a flow splitter joint having an inlet and a plurality of outlets, wherein the inlet extends axially and is communicated with the input port; and the outlets extend in a plane perpendicular to the axial direction and are respectively communicated with the fluid grooves.

[0016] Furthermore, the fluid groove is arranged on the radial inner side of the yoke and extends in the axial direction.

[0017] Furthermore, the winding sealing cavity is a sealed cavity body arranged inside the stator assembly, and the end of the winding sealing cavity opposite to the stator end seal is sealed by a part at the front of the motor, a circumferential seal is arranged on the circumferential outer side, and a stator seal is arranged on the circumferential inner side.

[0018] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0019] (1) The utility model uses a block-type stator and a flat wire winding for an outer rotor motor, thereby increasing the slot fill rate of the motor, reducing the copper loss of the motor, and improving the three-phase consistency of the motor inductance.

[0020] (2) The utility model adds a water cooling system to the stator of the motor, which can greatly improve the rated power and peak power of the motor.

[0021] (3) The utility model uses permanent magnets arranged in a Halbach array to improve the waveform of the motor's back electromotive force.

[0022] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0024] Figure 1 It is a schematic diagram of the partial structure of the teeth and yoke of the motor stator;

[0025] Figure 2 A schematic diagram of the partial structure of the iron core assembly of the motor;

[0026] Figure 3 A partial cross-section of the motor, including the bearing system and the position of the stator and rotor;

[0027] Figure 4 The partial structural composition of the water cooling system of the motor and the flow direction of the coolant are shown;

[0028] Figure 5 The setting position of the input port of the water cooling system is shown;

[0029] Figure 6 The arrangement of the permanent magnets of the motor is shown;

[0030] Figure 7 It is a schematic diagram of the structure of the motor as a whole from the upper side;

[0031] Figure 8 It is a schematic diagram of the structure of the motor as a whole from the bottom side perspective;

[0032] Fig. 9 (a)-(d) are schematic diagrams of the structure of the motor stator assembly from different perspectives;

[0033] Fig.10 It is a structural schematic diagram of the motor rotor assembly.

[0034] Reference numerals:

[0035] 101-tooth portion; 102-yoke portion; 103-stator seal, 104-winding; 105-first clamp; 106-slot wedge; 107-second clamp; 108-rotor yoke; 109-permanent magnet; 110-stator seat; 111-bearing cover; 112-bearing; 113-parts at the front of the motor; 114-shunt joint; 115-stator end seal; 116-circumferential seal; 117-permanent magnet assembly; 201-motor rotor assembly; 202-core assembly; 203-shunt assembly; 204-motor stator assembly. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0037] Example 1

[0038] The load connection part of the motor is hereinafter referred to as the front part, and the electrical output part is hereinafter referred to as the rear part.

[0039] A specific embodiment of the utility model is as follows Figure 1-Figure 10 As shown, a water-cooled outer rotor flat wire winding motor is disclosed. The motor includes a motor stator assembly 204, a motor rotor assembly 201, a bearing 112 and a water cooling system. The motor stator assembly 204 is fixedly connected to any device on which the motor works, including an unmanned aerial vehicle, a passenger aircraft, a cargo aircraft, etc., and the motor stator assembly 204 is in a stationary state relative to the device. The bearing cover 111 and the outer ring of the bearing 112 are fixedly connected to the motor stator assembly 204, the motor rotor assembly 201 is fixedly connected to the inner ring of the bearing 112, and the motor stator assembly 204 can rotate around the axial direction of the bearing 112. The fixing method can be a mechanical parts transfer fixing method, or a direct fixing method. The water cooling system is arranged adjacent to the stator assembly 201 for cooling the stator assembly 201. When the motor is working, it is powered by an additional inverter or AC power supply. The permanent magnet assembly 117 in the motor rotor assembly 201 is pulled by the electromagnetic force of the assembly composed of multiple windings 104 in the motor stator assembly 204, driving the motor rotor assembly 201 to rotate and make the motor work.

[0040] See also Figure 1 , Figure 7-Figure 9 The stator assembly 204 of the motor includes a stator seat 110 , a core assembly 202 and a stator seal 103 .

[0041] The stator seat 110 may adopt a conventional stator seat structure in the prior art, and is used to fix and support the core assembly 202. A bearing hole is provided on the stator seat 110, and the bearing 112 is installed on the stator seat 110 through the bearing hole.

[0042] The core assembly 202 includes a tooth portion 101, a yoke portion 102, and a winding 104. The motor core assembly 202 is produced in a block manner, and is divided into a plurality of tooth portions 101 and a plurality of yoke portions 102. The tooth portion 101 and the yoke portion 102 can be composed of stacked solid or sheet-like objects, and can be processed by machining such as milling machines, wire cutting, etc. After the tooth portion 101 is embedded in the winding 104, it is fixedly connected to the yoke portion 102, and the connection method can be welding, gluing, or connection by a clamp.

[0043] Since the above manufacturing method no longer needs to consider the winding problem, the utilization efficiency of the gap between the slots can be improved. At the same time, the winding 104 is wound with flat copper wire, which has better conductivity and better slot fill rate than round wire.

[0044] The stator seal 103 is an annular seal and is disposed on the inner circumferential end surface of the yoke 102. The stator seal 103 cooperates with the yoke 102 of the core assembly 202 so that the coolant is sealed after entering the core assembly 202, thereby preventing leakage and causing corrosion to the winding 104.

[0045] See also Figure 2 The winding 104 is a spirally wound flat copper wire, which is different from the commonly used round copper wire in that there is no parallel winding and the winding is formed in one step. The winding 104 is fixed on the tooth portion 101 of the core assembly 202 of the motor, and the fixing method is clamp positioning, or glue, self-positioning and the like. When using a clamp for positioning, the first clamp 105 and the second clamp 107 are respectively fixed to the two ends of the tooth portion 101 in the axial direction by glue, welding and the like, and then the winding 104 is installed on the tooth portion 101. The winding 104 is positioned in the axial direction by the first clamp 105 and the second clamp 107 respectively fixed to the two axial front and rear end faces of the core assembly 202, and the positioning in the circumferential direction is achieved by the slot wedge 106 at the notch.

[0046] like Figure 3 , Figure 6 as well as Fig.10 As shown, the rotor assembly 201 includes a rotor yoke 108 and a permanent magnet assembly 117 , wherein the permanent magnet assembly 117 includes a plurality of permanent magnets 109 .

[0047] like Figure 6 As shown, the permanent magnet assembly 117 is surface mounted, using a Halbach array or a directly magnetized permanent magnet 109. The Halbach array can improve the positive linearity of the motor, reduce the starting torque of the motor, and reduce the torque fluctuation of the motor. Each magnetic pole of the permanent magnet assembly 117 can be composed of a whole or a plurality of permanent magnets 109.

[0048] Increasing the thickness of the rotor yoke 108 can reduce the rotor magnetic flux density and improve the power level of the motor at the rated working point. The rotor yoke 108 is composed of stacked solid block or sheet steel materials and can be formed by any conventional machining method.

[0049] In the motor of the present invention, the inner ring of the bearing 112 is fixedly connected to the rotor assembly 201 of the motor, and the bearing cover 111 of the motor is made of metal or non-metal, and is mechanically connected to the motor stator seat 110, or can be connected by welding or glue.

[0050] The bearing 112 is a cross roller bearing, which has the characteristics of small clearance and can bear various loads such as axial, radial, bending moment, etc. The motor of the utility model adopts a single bearing structure, which can save the internal space of the motor and make room for the motor controller.

[0051] Cross roller bearings can bear both axial and radial forces, and are smaller than double-row ball bearings with the same performance. They are cheaper than four-point load bearings and are a more balanced choice for single-bearing motors. The axial force of the misalignment between the core and the permanent magnet can provide the preload required by the bearing.

[0052] See also Figure 4 , Figure 5 The motor of the present invention further includes a water cooling system, which includes an input port, a flow divider component 203, a fluid groove, a winding sealing cavity and an output port.

[0053] The input port is arranged on the bearing cover 111 and extends in the axial direction to introduce the coolant into the motor. Figure 4 , Figure 8 as well as Fig. 9 (a)- Fig. 9 As shown in (d), it includes a plurality of flow dividers 114 with one inlet and multiple outlets, the inlet extending in the axial direction and connected to the input port; the outlet extending in a plane perpendicular to the axial direction and connected to the fluid grooves respectively. The fluid groove is arranged on the radial inner side of the yoke 102 and extends in the axial direction, as shown in FIG. Figure 4 The winding sealed cavity is a sealed cavity disposed inside the stator assembly 204, and the winding 104 and the tooth portion 101 are both located in the sealed cavity. One end of the sealed cavity is sealed by a part 113 at the front of the motor, and a stator end seal 115 is disposed at the other end, a circumferential seal 116 is disposed on the circumferential outer side, and a stator seal 103 is disposed on the circumferential inner side. The output port is disposed on the end face of the stator end seal 115.

[0054] Figure 4Schematic diagram of the flow of coolant. During cooling, the cooling fluid is input from the input port on the bearing cover 111, passes through the stator seat 110 and enters the shunt assembly 203. The shunt assembly 203 divides the cooling fluid into three paths and passes into the fluid groove on the radial inner side of the yoke 102, and then enters the winding sealing cavity of the stator assembly 204 from the fluid groove to directly cool the stator assembly 204. After that, the cooling fluid flows out from the output port on the stator end seal 115 to form a cycle. The coolant is sealed by the part 113 at the front of the motor, the stator end seal 115 at the rear of the motor, and the circumferential seal 116 to prevent the coolant from leaking.

[0055] The water cooling system directly passes the coolant into the winding for cooling, which has a stronger heat exchange effect and lighter weight than indirect cooling. The coolant can be ethylene glycol and water solution or pure water.

[0056] Compared with the prior art, the water-cooled outer rotor flat wire winding motor provided in this embodiment uses a block-type stator and a flat wire winding for the outer rotor motor, thereby improving the slot fill rate of the motor, reducing the copper loss of the motor, and improving the three-phase consistency of the motor inductance; adding a water cooling system using ethylene glycol hydrate solution for cooling the stator of the motor can greatly improve the rated power and peak power of the motor; using permanent magnets arranged in a Halbach array, the waveform of the motor back electromotive force is improved.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A water-cooled outer rotor flat wire winding motor, characterized in that: It includes a stator assembly, a rotor assembly, a bearing and a water cooling system, wherein the stator assembly is located radially inward of the rotor assembly; the bearing cover and the outer ring of the bearing are fixedly connected to the stator assembly, and the inner ring of the bearing is fixedly connected to the rotor assembly; the stator assembly includes a stator seat, an iron core assembly and a stator seal, the iron core assembly is fixedly arranged on the stator seat, and the iron core assembly is a block structure; the water cooling system is arranged adjacent to the stator assembly, and the water cooling system is used to cool the stator assembly.

2. The water-cooled outer rotor flat wire winding motor according to claim 1, characterized in that: The core assembly includes a plurality of teeth, a yoke and a winding; the assembly sequence of the core assembly is to fix the winding on the teeth and then fix the teeth on the yoke.

3. The water-cooled outer rotor flat wire winding motor according to claim 1 or 2, characterized in that: The winding is a flat wire winding, and the winding is wound with flat copper wire.

4. The water-cooled outer rotor flat wire winding motor according to claim 1, characterized in that: The rotor assembly comprises a yoke and a permanent magnet assembly. The yoke is an annular body, and the permanent magnet assembly is fixedly arranged on the inner circumferential surface of the yoke.

5. The water-cooled outer rotor flat wire winding motor according to claim 4, characterized in that: The permanent magnet assembly is surface mounted and uses a Halbach array or a directly magnetized permanent magnet.

6. The water-cooled outer rotor flat wire winding motor according to claim 2, characterized in that: The water cooling system includes an input port, a flow divider component, a fluid groove, a winding sealing cavity and an output port connected in sequence; wherein the cooling liquid enters the motor from the input port and leaves the motor from the output port.

7. The water-cooled outer rotor flat wire winding motor according to claim 6, characterized in that: The input port is arranged on the bearing cover and extends in the axial direction; a stator end seal is arranged at one end of the winding sealing cavity, and the output port is arranged on the end surface of the stator end seal.

8. The water-cooled outer rotor flat wire winding motor according to claim 7, characterized in that: The flow splitter assembly comprises a flow splitter joint having an inlet and a plurality of outlets, wherein the inlet extends axially and is connected to the input port; the plurality of outlets extend in a plane perpendicular to the axial direction and are respectively connected to the fluid grooves.

9. The water-cooled outer rotor flat wire winding motor according to claim 8, characterized in that: The fluid groove is disposed radially inside the yoke and extends in the axial direction.

10. The water-cooled outer rotor flat wire winding motor according to claim 9, characterized in that: The winding sealing cavity is a sealed cavity arranged inside the stator assembly. The end of the winding sealing cavity opposite to the stator end seal is sealed by the parts at the front of the motor. A circumferential seal is arranged on the circumferential outer side, and a stator seal is arranged on the circumferential inner side.

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