A drive motor system

Abstract

The present invention discloses a drive motor system, comprising a motor and a controller. The motor comprises a housing, a stator assembly, a rotor assembly, and a rotating shaft. The stator assembly is fixed to the housing. The rotor assembly comprises a rotor core and a permanent magnet. The permanent magnet is fixed to the surface of the rotor core. The rotor core is sleeved on the rotating shaft. The two ends of the rotating shaft are rotatably connected to the housing. The rotor assembly is placed within the stator assembly. The controller comprises a heat sink and a drive circuit board. The heat sink is fixed to the right end of the housing, and a cooling chamber is formed between the heat sink and the housing. The present invention can simultaneously cool the housing and the heat sink by providing a cooling chamber, thereby cooling the stator and the drive circuit board. By connecting the lead ends of the stator winding coils to the cooling chamber, the stator winding can be better cooled, ensuring that both the motor and the controller of the drive motor system can obtain reliable heat dissipation.

Description

Technical Field

[0001] The present invention belongs to the technical field of drive motors and relates to a drive motor system. Background Art

[0002] Currently, the power of the scraper conveyor in a coal mining machine system is gradually increasing due to the requirement for increased coal mining machine power. Therefore, the power of the drive motor system used in the scraper conveyor is also gradually increasing. The drive motor system is composed of a drive motor and a controller. As the power increases, the heat dissipation performance requirements of the drive motor system are also correspondingly increased. The existing heat dissipation method of the drive motor system is to set a cooling water channel on the drive motor housing and install a cooling fan on the shaft. This cooling method cannot effectively dissipate heat, resulting in the drive motor system being prone to overheating after long-term operation, and even burning the drive motor and controller. Therefore, a drive motor system with good heat dissipation is needed. Summary of the Invention

[0003] In order to solve the above technical problems, an object of the present invention is to provide a drive motor system.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a drive motor system, comprising a motor and a controller, the motor comprising a housing, a stator assembly, a rotor assembly, and a rotating shaft, the stator assembly being fixed to the housing, the rotor assembly comprising a rotor core and a permanent magnet, the permanent magnet being fixed to the surface of the rotor core, the rotor core being sleeved on the rotating shaft, the two ends of the rotating shaft being rotatably connected to the housing, the rotor assembly being disposed within the stator assembly, the stator assembly comprising a stator core and a stator winding, the stator core being provided with a plurality of stator slots, the stator winding being installed in the stator slots, and the stator winding comprising a plurality of coils, each of the coils having two lead ends, the controller comprising a heat sink and a driver circuit board, the heat sink being fixed to the right end of the housing, and a cooling chamber being formed between the heat sink and the housing, the driver circuit board being fixed to the right end of the heat sink, the lead ends of all the coils respectively passing through the housing, the cooling chamber, the heat sink, and the driver circuit board, and the driver circuit board being provided with a plurality of clamps for clamping the lead ends.

[0005] 14. The heat dissipation device of claim 13 wherein the arcuate depression has a side wall that is located adjacent to the top of the heat dissipation device and the side wall that is located adjacent to the top of the heat dissipation device. The arcuate depression has a side wall that is located adjacent to the top of the heat dissipation device and the side wall that is located adjacent to the top of the heat dissipation device.

[0006] A first liquid guide hole and a first lead wire through hole are sequentially provided in radial order from outside to inside in each liquid outlet cavity of the heat sink, and a second liquid guide hole and a second lead wire through hole are sequentially provided in radial order from outside to inside in the liquid inlet cavity between any two liquid outlet cavities;

[0007] A third lead through hole and a fourth lead through hole are respectively provided on the right end cover of the housing at positions corresponding to each first lead through hole and each second lead through hole;

[0008] An embedding groove is respectively provided at the position of each first liquid guide through hole and the second liquid guide through hole on the heat dissipation plate, and the embedding groove is located on the right end surface where the heat dissipation plate is fixed to the driver circuit board. A square hole is respectively provided at the position corresponding to each embedding groove on the driver circuit board, and a round hole is respectively provided at the position corresponding to each first lead through hole and each second lead through hole;

[0009] One lead end of each coil of the stator winding passes through the fourth lead through hole in the liquid inlet chamber, the second lead through hole and the circular hole corresponding to the position of the second lead through hole on the driving circuit board in sequence, and the other lead end passes through the third lead through hole in the liquid outlet chamber, the first lead through hole and the circular hole corresponding to the position of the first lead through hole on the driving circuit board in sequence.

[0010] Furthermore, a clamping member is provided in each square hole on the driver circuit board, and the clamping member includes a fixing seat, a connecting conduit, and a clamping arm. The fixing seat is a square block, and a center hole is provided in the center of the fixing seat in a vertical direction. One end of the connecting conduit passes through the center hole in a vertical direction and is fixed to the center hole, and the bottom end of the connecting conduit is exposed from the fixing seat and is used to communicate with the first liquid guide hole or the second liquid guide hole. A pair of clamping arms for clamping the lead end are fixed on the side wall of the fixing seat, and the other end of the connecting conduit is bent and placed on the side of the fixing seat where the clamping arm is provided, for connection with the lead end; the fixing seat, the connecting conduit, and the clamping arm are an integrally formed structure;

[0011] A fixing seat is placed in each square hole of the driving circuit board, and the fixing seat is embedded in the embedding groove on the heat sink. One lead end of each coil is connected to a connecting conduit on the fixing seat located in the liquid inlet chamber, and the other lead end is connected to a connecting conduit on the fixing seat located in the liquid outlet chamber.

[0012] Furthermore, a liquid inlet is provided on the edge of the liquid inlet chamber of the right end cover.

[0013] Furthermore, a liquid outlet is provided on the circumferential surface of the second annular boss of the right end cover of the housing, corresponding to each liquid outlet chamber in the radial direction.

[0014] Furthermore, a ratio P2 / P1 of the number of poles P2 of the rotor core to the number of poles P1 of the stator core is 14-17.

[0015] Furthermore, a ratio D2 / D1 of the inner diameter D2 of the stator core to the outer diameter D1 of the stator core is 0.64.

[0016] Furthermore, the slot coefficient of the stator slot is 0.71.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a drive motor system for a mining scraper conveyor. By forming a cooling chamber between a heat sink and a housing, and employing a magnetic field modulation permanent magnet motor as the drive motor, the drive motor system exhibits low-speed, high-torque output characteristics. Furthermore, the provision of the cooling chamber simultaneously cools the housing and heat sink, further cooling the stator and drive circuit board. By connecting the leads of the stator winding coils to the cooling chamber, the stator windings are better cooled, ensuring reliable heat dissipation for both the motor and controller of the drive motor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the drive motor system of the present invention;

[0019] Figure 2It is a schematic diagram of the installation structure of the stator and rotor;

[0020] Figure 3 is a schematic diagram of the cross-sectional structure of the clamping member;

[0021] Figure 4 It is a schematic diagram of the fixing seat and the clamping arm in the clamping member clamping the lead end;

[0022] Figure 5 1 is a schematic structural diagram of the right end face of the right end cover of the casing;

[0023] Figure 6 yes Figure 5 AA section view in;

[0024] Figure 7 1 is a structural diagram of the left end surface of the heat sink;

[0025] Figure 8 yes Figure 7 BB section in the figure;

[0026] Figure 9 This is a schematic diagram of the installation structure of the controller, clamping parts and lead terminals;

[0027] Figure 10 It is a diagram showing the relationship between the ratio of the number of rotor poles P2 to the number of stator poles P1 (P2 / P1) and the per-unit torque value of the motor;

[0028] Figure 11 Schematic diagram of the relationship curve between the ratio D2 / D1 of the stator core inner diameter D2 to the stator core outer diameter D1 and the per-unit torque value of the motor;

[0029] Figure 12 It is a diagram showing the relationship between the stator slot coefficient and the per-unit torque value of the motor;

[0030] Figure: 1. Casing; 101. Left end cap; 102. Right end cap; 1021. Second annular boss; 1022. First U-shaped rib; 1023. Third lead hole; 1024. Fourth lead hole; 1025. Liquid inlet; 1026. Liquid outlet; 2. Stator core; 21. Stator slots; 3. Stator winding; 4. Rotor assembly; 41. Permanent magnet; 42. Rotor core; 5. Rotating shaft ; 6. Heat dissipation plate; 61. Third annular boss; 62. Second U-shaped rib; 63. First liquid guide hole; 64. First lead wire hole; 65. Second liquid guide hole; 66. Second lead wire hole; 67. Embedded groove; 7. Driving circuit board; 71. Square hole; 72. Round hole; 8. Clamping piece; 81. Fixed seat; 82. Connecting conduit; 83. Clamping arm; 9. Lead end; 10. Cooling chamber. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1

[0033] Reference Figures 1-9 A drive motor system includes a motor and a controller. The motor includes a housing 1, a stator assembly, a rotor assembly 4, and a rotating shaft 5. The stator assembly is fixed to the housing 1. The rotor assembly 4 includes a rotor core 42 and a permanent magnet 41. The permanent magnet 41 is fixed to the surface of the rotor core 42. The rotor core 42 is sleeved on the rotating shaft 5. The two ends of the rotating shaft 5 are rotatably connected to the left end cover 101 and the right end cover 102 of the housing 1 respectively. The rotor assembly 4 is placed in the stator assembly. The stator assembly includes a stator core 2 and a stator winding 3. The stator core 2 is provided with a plurality of stator slots. 21. The stator winding 3 is installed in the stator slot 21, and the stator winding 3 includes a plurality of coils, each of which has two lead ends 9. The controller includes a heat sink 6 and a drive circuit board 7. The heat sink 6 is fixed to the right end of the casing 1, and a cooling chamber 10 is formed between the heat sink 6 and the casing 1. The drive circuit board 7 is fixed to the right end of the heat sink 6. The lead ends 9 of all coils pass through the casing 1, the cooling chamber 10, the heat sink 6 and the drive circuit board 7 in sequence. A plurality of clamps 8 for clamping the lead ends 9 are provided on the drive circuit board 7.

[0034] Reference Figure 5-Figure 8The right end cover 102 of the housing includes a first disc body, and the outer edge of the first disc body facing the controller extends to the right to form a second annular boss 1021, and a plurality of first U-shaped ribs 1022 are evenly distributed along the inner circumference of the second annular boss 1021. The heat dissipation plate 6 includes a second disc body, and the outer edge of the second disc body facing the housing 1 extends to the left to form a third annular boss 61, and a plurality of second U-shaped ribs 62 are evenly distributed along the inner circumference of the third annular boss 61. The number of the second U-shaped ribs 62 is the same as that of the first U-shaped ribs 1022. The number and position of the second annular boss 1021 are the same and the third annular boss 61 are fitted together and fixed with glue. After the end faces of each pair of first U-shaped ribs 1022 and second U-shaped ribs 62 are fitted together and fixed with glue, the internal area forms a liquid outlet chamber closed on all sides, and the area outside all liquid outlet chambers forms a liquid inlet chamber. Each of the liquid outlet chambers is not connected to the liquid inlet chamber, separating the liquid outlet chamber from the liquid inlet chamber, thereby preventing the coolant in the liquid inlet chamber from flowing out directly from the liquid outlet chamber; multiple liquid outlet chambers and liquid inlet chambers together form a cooling chamber 10.

[0035] A first liquid guide hole 63 and a first lead wire hole 64 are sequentially provided in the radial direction from the outside to the inside in each liquid outlet cavity of the heat dissipation plate 6, and a second liquid guide hole 65 and a second lead wire hole 66 are sequentially provided in the radial direction from the outside to the inside in the liquid inlet cavity between the two liquid outlet cavities.

[0036] A third lead through hole 1023 and a fourth lead through hole 1024 are respectively provided on the right end cover 102 of the housing 1 at positions corresponding to each first lead through hole 64 and each second lead through hole 66;

[0037] Reference Figure 9 , an embedding groove 67 is respectively provided at the position of each first liquid guiding through hole 63 and the second liquid guiding through hole 65 on the heat dissipation plate 6. The embedding groove 67 is located on the right end surface where the heat dissipation plate 6 and the driving circuit board 7 are fixed. A square hole 71 is respectively provided on the driving circuit board 7 at a position corresponding to each embedding groove 67, and a round hole 72 is respectively provided at a position corresponding to each first lead through hole 64 and each second lead through hole 66;

[0038] One lead end 9 of each coil of the stator winding 3 passes through the fourth lead through hole 1024 in the liquid inlet chamber, the second lead through hole 66 and the circular hole 72 on the driving circuit board 7 corresponding to the position of the second lead through hole 66 in sequence, and the other lead end 9 passes through the third lead through hole 1023 in the liquid outlet chamber, the first lead through hole 64 and the circular hole 72 on the driving circuit board 7 corresponding to the position of the first lead through hole 64 in sequence.

[0039] Reference Figure 9, a clamping member 8 is provided in each square hole 71 on the driving circuit board 7, referring to Figure 3-Figure 4 The clamping member 8 includes a fixing seat 81, a connecting conduit 82 and a clamping arm 83. The fixing seat 81 is a square block. A center hole is provided in the center of the fixing seat 81 in the vertical direction. One end of the connecting conduit 82 passes through the center hole in the vertical direction and is fixed to the center hole, and the bottom end of the connecting conduit 82 is exposed from the fixing seat 81, which is used to communicate with the first liquid guide hole 63 of the liquid outlet chamber or the second liquid guide hole 65 of the liquid inlet chamber. A pair of clamping arms 83 for clamping the lead end 9 are fixed on the side wall of the fixing seat 81. The other end of the connecting conduit 82 is bent and placed on the side of the fixing seat 81 where the clamping arm 83 is provided, for connecting with the lead end 9; the fixing seat 81, the connecting conduit 82 and the clamping arm 83 are an integrally formed structure.

[0040] A fixing seat 81 is placed in each square hole 71 of the driving circuit board 7, and the fixing seat 81 is embedded in the embedding groove 67 on the heat sink 6. One lead end 9 of each coil is connected to a connecting pipe 82 on the fixing seat 81 located in the liquid inlet chamber, and the other lead end 9 is connected to a connecting pipe 82 on the fixing seat 81 located in the liquid outlet chamber.

[0041] Reference Figure 5 A liquid outlet 1026 is provided on the circumferential surface of the second annular boss 1021 of the right end cover 102 of the housing 1 in a radial direction corresponding to each liquid outlet chamber.

[0042] A liquid inlet 1025 is provided on the edge of the liquid inlet chamber of the right end cover 102 .

[0043] The cooling liquid in the liquid inlet chamber enters the connecting duct 82 from the second liquid guide hole 65, and then flows into the coil through the lead end 9 connected to the connecting duct 82 to cool the coil. Then the cooling liquid flows out from the lead end 9 at the other end of the coil located in the liquid outlet chamber and the connecting duct 82 connected to the lead end 9, and then enters the liquid outlet chamber from the second liquid guide hole 65 connected to the connecting duct 82, and finally flows out from the liquid outlet 1026 located in the liquid outlet chamber.

[0044] Reference Figure 10 The ratio P2 / P1 of the number of poles P2 of the rotor core 42 to the number of poles P1 of the stator core 2 is 14 to 17. Figure 11 The ratio D2 / D1 of the inner diameter D2 of the stator core 2 and the outer diameter D1 of the stator core 2 is 0.64. Figure 12 , the slot coefficient of stator slot 21 is 0.71. Under the conditions of P2 / P1 of 14-17, D2 / D1 of 0.64, and a slot coefficient of 0.71, the optimized motor achieves the maximum per-unit torque (dimensionless). By optimizing the above motor parameters, the drive motor is confirmed to have optimal performance.

[0045] The present invention adopts a magnetic field modulation permanent magnet motor as a drive motor, so that the drive motor system has the output characteristics of low speed and high torque. By designing a new cooling system, a cooling chamber is designed between the heat sink 6 and the casing 1. The coolant can cool the casing 1 and the heat sink 6 at the same time through the cooling chamber, and then cool the stator assembly and the drive circuit board 7; by connecting the lead end of the coil of the stator winding 3 with the cooling chamber, the stator winding 3 can be better cooled, ensuring that the motor and controller of the drive motor system can be reliably cooled.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A drive motor system, characterized in that: The invention comprises a motor and a controller, wherein the motor comprises a casing, a stator assembly, a rotor assembly, and a rotating shaft, wherein the stator assembly is fixed to the casing, the rotor assembly comprises a rotor core and a permanent magnet, the permanent magnet is fixed to the surface of the rotor core, the rotor core is sleeved on the rotating shaft, and the two ends of the rotating shaft are rotatably connected to the casing respectively, the rotor assembly is placed in the stator assembly, the stator assembly comprises a stator core and a stator winding, the stator core is provided with a plurality of stator slots, the stator winding is installed in the stator slots, and the stator winding comprises a plurality of coils, each of the coils has two lead ends, the controller comprises a heat sink and a drive circuit board, the heat sink is fixed to the right end of the casing, and a cooling chamber is formed between the heat sink and the casing, the drive circuit board is fixed to the right end of the heat sink, the lead ends of all the coils respectively pass through the casing, the cooling chamber, the heat sink and the drive circuit board in sequence, and a plurality of clamps for clamping the lead ends are provided on the drive circuit board; The right end cover of the casing includes a first disc body, an outer edge of the first disc body facing the controller extending to the right side to form a second annular boss, and a plurality of first U-shaped ribs are evenly distributed along the inner circumference of the second annular boss. The heat dissipation plate includes a second disc body, an outer edge of the second disc body facing the casing extending to the left side to form a third annular boss, and a plurality of second U-shaped ribs are evenly distributed along the inner circumference of the third annular boss. The number of the second U-shaped ribs is the same as the number of the first U-shaped ribs and the positions correspond to each other, the second annular boss and the third annular boss are affixed and fixed with adhesive, and after each pair of the first U-shaped ribs and the second U-shaped rib end faces are affixed and fixed with adhesive, the internal area forms a liquid outlet chamber closed on all sides, and the areas outside all liquid outlet chambers form a liquid inlet chamber, each of the liquid outlet chambers is not connected to the liquid inlet chamber, and the plurality of liquid outlet chambers and the liquid inlet chamber together form a cooling chamber; A first liquid guide hole and a first lead wire through hole are sequentially provided in radial order from outside to inside in each liquid outlet cavity of the heat sink, and a second liquid guide hole and a second lead wire through hole are sequentially provided in radial order from outside to inside in the liquid inlet cavity between any two liquid outlet cavities; A third lead through hole and a fourth lead through hole are respectively provided on the right end cover of the housing at positions corresponding to each first lead through hole and each second lead through hole; An embedding groove is respectively provided at the position of each first liquid guide through hole and the second liquid guide through hole on the heat dissipation plate, and the embedding groove is located on the right end surface where the heat dissipation plate is fixed to the driver circuit board. A square hole is respectively provided at the position corresponding to each embedding groove on the driver circuit board, and a round hole is respectively provided at the position corresponding to each first lead through hole and each second lead through hole; One lead end of each coil of the stator winding sequentially passes through the fourth lead through-hole in the liquid inlet chamber, the second lead through-hole, and the circular hole on the driver circuit board corresponding to the position of the second lead through-hole, and the other lead end sequentially passes through the third lead through-hole in the liquid outlet chamber, the first lead through-hole, and the circular hole on the driver circuit board corresponding to the position of the first lead through-hole; A clamping member is provided in each square hole on the driver circuit board, and the clamping member includes a fixing seat, a connecting conduit, and a clamping arm. The fixing seat is a square block, and a center hole is provided in the center of the fixing seat in a vertical direction. One end of the connecting conduit passes through the center hole in a vertical direction and is fixed to the center hole, and the bottom end of the connecting conduit is exposed from the fixing seat and is used to communicate with the first liquid guide hole or the second liquid guide hole. A pair of clamping arms for clamping the lead end are fixed on the side wall of the fixing seat, and the other end of the connecting conduit is bent and placed on a side of the fixing seat provided with the clamping arm for connection with the lead end; the fixing seat, the connecting conduit, and the clamping arm are an integrally formed structure; A fixing seat is placed in each square hole of the driver circuit board, and the fixing seat is embedded in the embedding groove on the heat sink. One lead end of each coil is connected to a connecting conduit on the fixing seat located in the liquid inlet chamber, and the other lead end is connected to a connecting conduit on the fixing seat located in the liquid outlet chamber. A liquid inlet is provided on the edge of the liquid inlet chamber of the right end cover.

2. A drive motor system according to claim 1, characterized in that: A liquid outlet is respectively provided on the circumferential surface of the second annular boss of the right end cover of the housing in a radial direction corresponding to each liquid outlet chamber.

3. A drive motor system according to claim 1, characterized in that: The ratio P2 / P1 of the number of poles P2 of the rotor core to the number of poles P1 of the stator core is 14-17.

4. A drive motor system according to claim 1, characterized in that: The ratio D2 / D1 of the inner diameter D2 of the stator core to the outer diameter D1 of the stator core is 0.64.

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