Switched reluctance motor with stator winding directly cooled

Abstract

The invention discloses a switched reluctance motor with a directly cooled stator winding, and belongs to the field of reluctance motors, the switched reluctance motor comprises a switched reluctance motor main body, a shaft rod, a rotor, a winding and a stator core, the shaft rod, the rotor, the winding and the stator core are all arranged in the switched reluctance motor main body, the stator core is fixedly arranged on the inner wall of the switched reluctance motor main body, and the stator winding is arranged in the switched reluctance motor main body. A winding is wound on the stator iron core, a rotor is movably sleeved at the central part of the rotor, and a cooling cavity matched with the stator iron core for use is formed in the switched reluctance motor main body. Through the arrangement of the radial grooves, the stator grooves, the axial grooves and the cooling cavities, the cooling mode that heat generated by the winding passes through the radial grooves and is transferred through a medium and taken away is matched with the cooling mode that heat is taken away after direct contact with the winding, comprehensive cooling is formed, and the cooling efficiency is improved. And compared with the prior art, the cooling efficiency is higher, and the winding temperature is reduced by more than 20 DEG C under the same working condition.

Description

Technical Field

[0001] The present invention relates to the field of reluctance motors, and more particularly to a stator winding directly cooled switched reluctance motor. Background Art

[0002] The reluctance motor is a continuously running electrical transmission device. Its structure and working principle are very different from those of traditional AC and DC motors. It does not rely on the interaction of the magnetic fields generated by the stator and rotor winding currents to generate torque, but relies on the "minimum reluctance principle" to generate torque.

[0003] Common cooling methods for switched reluctance motors include air cooling, water cooling and oil cooling. The effect of air-cooled motors is relatively poor and they are rarely used in high power density situations. Water cooling technology and oil cooling technology are currently the mainstream heat dissipation methods for switched reluctance motors. The stator generally arranges the cooling jacket inside the casing, using axial flow channels, circular flow channels, spiral flow channels, etc.

[0004] A Chinese patent with authorization announcement number CN106992614A discloses a motor stator cooling structure and a motor. The application has two cooling pipes embedded in the stator bracket, which reduces the number of cooling joints, but still uses a cooling channel designed inside the casing outside the stator; another stator cooling technology uses oil spray cooling at the end of the winding, but this solution has limited cooling capacity for the switched reluctance motor. A Chinese patent with authorization announcement number CN106992614A discloses a rotating motor cooling device, and this application also uses this cooling solution.

[0005] However, this cooling technology cannot directly cool the heat source. The heat generated by the winding and stator core needs to pass through the slot insulation, stator, and water jacket wall to be transferred to the cooling medium and taken away. Especially when the fitting tolerance between the components has a greater impact on the thermal resistance on the transfer path, the transfer path is long and the heat transfer efficiency is low. Summary of the invention

[0006] In view of the problems existing in the prior art, an object of the present invention is to provide a stator winding directly cooled switched reluctance motor.

[0007] To solve the above problems, the present invention adopts the following technical solutions.

[0008] A stator winding directly cooled switched reluctance motor comprises a switched reluctance motor body, a shaft, a rotor, a winding and a stator core, wherein the shaft, the rotor, the winding and the stator core are all arranged inside the switched reluctance motor body, the outer surface of the shaft is fixedly sleeved with a rotor, the stator core is fixedly arranged on the inner wall of the switched reluctance motor body, the stator core is wound with a winding, the central part of the rotor is movably sleeved with a rotor, the outer surface of the switched reluctance motor body is symmetrically provided with a coolant outlet and a coolant inlet, and a cooling cavity used in conjunction with the stator core is opened inside the switched reluctance motor body.

[0009] Furthermore, the switched reluctance motor body is divided into two parts: a casing and a cover, and the coolant outlet and the coolant inlet are arranged on the casing and communicated with the interior of the casing.

[0010] Furthermore, a radial groove for use with the stator core is provided in the middle of the inner wall of the casing, and the radial groove is an annular structure, and the radial groove is connected to the coolant inlet and the coolant outlet.

[0011] Furthermore, the stator core includes two conventional punching sheets and one special-shaped punching sheet, a special-shaped punching sheet is fixedly arranged between the two conventional punching sheets, stator slots are opened inside the two conventional punching sheets and the special-shaped punching sheet, and a part of the winding is arranged in the stator slot inside the conventional punching sheet, the stator slots of the two conventional punching sheets and the special-shaped punching sheet are connected to each other, the stator slots on the special-shaped punching sheet are connected to the outside of the stator core, and the stator slots of the conventional punching sheet pass through the inner wall of the conventional punching sheet and are connected to its inner surface.

[0012] Furthermore, the inner wall of the conventional punching sheet is provided with slot wedges for separating the winding and the rotor, and the slot wedges match the stator slots.

[0013] Furthermore, a part of a group of windings is symmetrically arranged in the stator slot inside the conventional punching sheet, and a gap is left between the group of windings, and the gap is a guide flow hole.

[0014] Furthermore, the inner wall of the housing is symmetrically provided with an upper and a lower axial groove, and the upper axial groove is connected to the coolant inlet, and the lower axial groove is connected to the coolant outlet.

[0015] Furthermore, two machine covers are symmetrically arranged, and a cavity is left between each machine cover and the rotor and stator core, and the cavity is a cooling cavity.

[0016] Furthermore, the stator slots are provided in a total of eighteen groups and are circumferentially and equidistantly arranged in the stator core, and each stator slot located on the special-shaped punching sheet is connected to the radial slot at that position.

[0017] Furthermore, the length of the guide flow hole is greater than the length of the stator slot inside the stator core, and both sides of the portion exceeding the length of the stator slot inside the stator core are used for outflow of coolant.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides radial slots, stator slots, axial slots and cooling cavities. The heat generated by the winding is transferred through the radial slots via the medium and taken away. The heat is taken away after direct contact with the winding. The two cooling methods cooperate with each other to form comprehensive cooling. Compared with the prior art, the cooling efficiency is higher and the winding temperature can be reduced by more than 20°C under the same working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall schematic diagram of the switched reluctance motor of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal cross-section of the switched reluctance motor of the present invention;

[0022] Figure 3 It is a schematic diagram of the internal cross section of the switched reluctance motor of the present invention;

[0023] Figure 4 is a schematic cross-sectional view of a casing of the present invention;

[0024] Figure 5 Schematic diagram of the stator core of the present invention.

[0025] Description of the numbers in the figure:

[0026] 1. Switched reluctance motor body; 2. Shaft; 3. Rotor; 4. Winding; 5. Stator core; 6. Coolant inlet; 7. Coolant outlet; 11. Casing; 12. Cover; 13. Cooling cavity; 14. Radial slot; 15. Axial slot; 41. Guide flow hole; 51. Conventional punching sheet; 52. Special-shaped punching sheet; 53. Stator slot; 54. Slot wedge. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0028] See also Figures 1 to 5A stator winding directly cooled switched reluctance motor comprises a switched reluctance motor body 1, a shaft 2, a rotor 3, a winding 4 and a stator core 5. The shaft 2, the rotor 3, the winding 4 and the stator core 5 are all arranged inside the switched reluctance motor body 1. The rotor 3 is fixedly sleeved on the outer surface of the shaft 2. The stator core 5 is fixedly arranged on the inner wall of the switched reluctance motor body 1. The winding 4 is wound around the stator core 5. The rotor 3 is movably sleeved on the central part of the rotor 3. The outer surface of the switched reluctance motor body 1 is symmetrically provided with a coolant outlet 7 and a coolant inlet 6. A cooling chamber 13 used in conjunction with the stator core 5 is opened inside the switched reluctance motor body 1.

[0029] The switched reluctance motor body 1 is divided into two parts: a casing 11 and a cover 12 . The coolant outlet 7 and the coolant inlet 6 are arranged on the casing 11 and communicated with the interior of the casing 11 .

[0030] A radial groove 14 for use with the stator core 5 is provided in the middle of the inner wall of the casing 11 , and the radial groove 14 is an annular structure. The radial groove 14 is connected to the coolant inlet 6 and the coolant outlet 7 .

[0031] The stator core 5 includes two conventional punching sheets 51 and one special-shaped punching sheet 52. A special-shaped punching sheet 52 is fixedly arranged between the two conventional punching sheets 51. Stator slots 53 are opened inside the two conventional punching sheets 51 and the special-shaped punching sheet 52, and a part of the winding 4 is arranged in the stator slot 53 inside the conventional punching sheet 51. The stator slots 53 of the two conventional punching sheets 51 and the special-shaped punching sheet 52 are connected to each other, the stator slots 53 on the special-shaped punching sheet 52 are connected to the outside of the stator core 5, and the stator slots 53 of the conventional punching sheet 51 pass through the inner wall of the conventional punching sheet 51 and are connected to its inner surface.

[0032] The inner wall of the conventional punching sheet 51 is provided with slot wedges 54 for separating the winding 4 and the rotor 3 , and the slot wedges 54 match the stator slots 53 .

[0033] Parts of a group of windings 4 are symmetrically arranged in the stator slots 53 inside the conventional punching sheet 51 , and gaps are left between the group of windings 4 , and the gaps are guide flow holes 41 .

[0034] The inner wall of the housing 11 is symmetrically provided with an upper and a lower axial groove 15 , and the upper axial groove 15 is connected to the coolant inlet 6 , and the lower axial groove 15 is connected to the coolant outlet 7 .

[0035] Two machine covers 12 are symmetrically arranged, and a cavity is left between each machine cover 12 and the rotor 3 and the stator core 5 , and the cavity is a cooling cavity 13 .

[0036] There are eighteen groups of stator slots 53 in total and they are circumferentially equidistantly arranged in the stator core 5 . Each stator slot 53 on the special-shaped punching sheet 52 is connected to the radial slot 14 at that position.

[0037] The length of the guide flow hole 41 is greater than the length of the stator slot 53 inside the stator core 5 , and both sides of the portion exceeding the length of the stator slot 53 inside the stator core 5 are used for outflow of coolant.

[0038] By adopting the above technical solution, when the rotor 3 inside the switched reluctance motor body 1 is working, the switched reluctance motor body 1 is placed with the coolant inlet 6 facing upward and the coolant outlet 7 facing downward. The coolant inlet 6 enters the coolant, and the coolant enters the radial slot 14. At this time, the coolant inside the radial slot 14 will take away part of the heat generated by the winding 4 when flowing. The coolant flowing through the radial slot 14 enters the stator slot 53 in the stator core 5, flows radially toward both ends along the direction of the machine cover 12 through the stator slot 53 on the special-shaped punching sheet 52, and then enters the stator slot 53 of the two conventional punching sheets 51, and then flows toward both ends through the flow holes in the stator slot 53. At this time, the coolant is in direct contact with the winding 4 to cool it and take away the surface heat until the coolant flows to the part where the length of the flow hole exceeds the length of the stator slot 53. The coolant can enter the cooling cavity 13 due to gravity and negative pressure and accumulate at the bottom of the cooling cavity 13, and be discharged through the axial groove 15 connected to the bottom coolant outlet 7. The heat generated by the winding 4 is transferred through the radial groove 14 through the medium and taken away by the cooling method, and the heat is taken away after direct contact with the winding 4. The two cooling methods cooperate with each other to form comprehensive cooling. Compared with the prior art, the cooling efficiency is higher. Under the same working conditions, the temperature of the winding 4 is reduced by more than 20°C.

[0039] Instructions for use: When the rotor 3 inside the switched reluctance motor body 1 is working, the switched reluctance motor body 1 is placed with the coolant inlet 6 facing upward and the coolant outlet 7 facing downward. The coolant enters the coolant inlet 6, and the coolant enters the radial slot 14. At this time, the coolant inside the radial slot 14 will take away part of the heat generated by the winding 4 when flowing. The coolant flowing through the radial slot 14 enters the stator slot 53 in the stator core 5, and flows to both ends through the flow holes in the stator slot 53. At this time, the coolant is in direct contact with the winding 4 to cool it and take away the surface heat until the coolant flows to the part where the length of the flow hole exceeds the length of the stator slot 53. The coolant will enter the cooling cavity 13 due to gravity and accumulate at the bottom of the cooling cavity 13.

[0040] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A stator winding directly cooled switched reluctance motor, comprising a switched reluctance motor body (1), a shaft (2), a rotor (3), a winding (4) and a stator core (5), wherein the shaft (2), the rotor (3), the winding (4) and the stator core (5) are all arranged inside the switched reluctance motor body (1), and characterized in that: The outer surface of the shaft (2) is fixedly sleeved with a rotor (3), the stator core (5) is fixedly arranged on the inner wall of the switched reluctance motor body (1), a winding (4) is wound around the stator core (5), the central part of the rotor (3) is movably sleeved with the rotor (3), the outer surface of the switched reluctance motor body (1) is symmetrically provided with a coolant outlet (7) and a coolant inlet (6), and the inside of the switched reluctance motor body (1) is provided with a cooling cavity (13) used in conjunction with the stator core (5).

2. A stator winding (4) directly cooled switched reluctance motor according to claim 1, characterized in that: The switched reluctance motor body (1) is divided into two parts: a casing (11) and a cover (12); a coolant outlet (7) and a coolant inlet (6) are arranged on the casing (11) and are in communication with the interior of the casing (11).

3. A stator winding (4) directly cooled switched reluctance motor according to claim 2, characterized in that: A radial groove (14) for use with the stator core (5) is provided in the middle of the inner wall of the casing (11), and the radial groove (14) is an annular structure. The radial groove (14) is connected to the coolant inlet (6) and the coolant outlet (7).

4. A stator winding (4) directly cooled switched reluctance motor according to claim 3, characterized in that: The stator core (5) comprises two conventional punching sheets (51) and one special-shaped punching sheet (52), one special-shaped punching sheet (52) is fixedly arranged between the two conventional punching sheets (51), stator slots (53) are provided inside the two conventional punching sheets (51) and the one special-shaped punching sheet (52), and a part of the winding (4) is arranged in the stator slots (53) inside the conventional punching sheet (51), the stator slots (53) of the two conventional punching sheets (51) and the one special-shaped punching sheet (52) are connected to each other, the stator slots (53) on the special-shaped punching sheet (52) are connected to the outside of the stator core (5), and the stator slots (53) of the conventional punching sheet (51) pass through the inner wall of the conventional punching sheet (51) and are connected to its inner surface.

5. A stator winding (4) directly cooled switched reluctance motor according to claim 4, characterized in that: The inner wall of the conventional punching sheet (51) is provided with a slot wedge (54) for separating the winding (4) and the rotor (3), and the slot wedge (54) matches the stator slot (53).

6. A stator winding (4) directly cooled switched reluctance motor according to claim 5, characterized in that: A portion of a group of windings (4) is symmetrically arranged in the stator slot (53) inside the conventional punching sheet (51), and a gap is left between the group of windings (4), and the gap is a guide flow hole (41).

7. A stator winding (4) directly cooled switched reluctance motor according to claim 6, characterized in that: The inner wall of the housing (11) is symmetrically provided with an upper and a lower axial groove (15), and the upper axial groove (15) is connected to the coolant inlet (6), and the lower axial groove (15) is connected to the coolant outlet (7).

8. A stator winding (4) directly cooled switched reluctance motor according to claim 7, characterized in that: Two machine covers (12) are symmetrically arranged, and a cavity is left between each machine cover (12) and the rotor (3) and the stator core (5), and the cavity is a cooling cavity (13).

9. A stator winding (4) directly cooled switched reluctance motor according to claim 7, characterized in that: The stator slots (53) are provided in eighteen groups in total and are circumferentially equidistantly arranged in the stator core (5), and each stator slot (53) located on the special-shaped punching sheet (52) is connected to a corresponding radial slot (14).

10. A stator winding (4) directly cooled switched reluctance motor according to claim 9, characterized in that: The length of the guide flow hole (41) is greater than the length of the stator slot (53) inside the stator core (5), and the two sides of the portion exceeding the length of the stator slot (53) inside the stator core (5) are used for outflow of cooling liquid.

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