Wound rotor motor

Abstract

The utility model relates to a wound rotor motor, which comprises a front bearing outer cover, an end cover, a base, a junction box, a rotor dust board, a bearing inner cover, a high end cover and a rear bearing outer cover, wherein the junction box is arranged at the upper end of the motor shell; the junction box is provided with three cable inlet holes and one temperature measuring element inlet hole; the bottom of the junction box is of a square structure; and the rotor dust board is arranged on the inner side of the matching surface of the high end cover and the base. According to the utility model, motor material cost is saved; the base weight is reduced; the heat dissipation area of the motor is increased; different requirements of users for wiring on the left and right sides are met; detection and protection of the motor are facilitated; dust generated by friction between the rotor collector ring and the carbon brush is effectively prevented from entering the rotor; and user wiring is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a wound rotor motor. Background Art

[0002] With the development of frequency conversion technology, variable frequency speed regulation motors have developed rapidly. Small YZR series wound rotor motors are showing a trend of being replaced by variable frequency speed regulation motors, but the price of large-size inverters is very expensive. Therefore, the market prospect of YZR series medium-sized wound rotor motors for lifting and metallurgy is very good.

[0003] Medium-sized wound rotor motors generally refer to motors with a center height of 450-560 frame size.

[0004] The medium-sized wound rotor motors of the prior art have the following defects:

[0005] 1. Since the base and end cover of the medium-sized wound rotor motor in the prior art adopt the sand casting process, the motor base is not only bulky and unsightly, but also has too large machining allowance for the base blank, which not only increases the finishing time but also wastes materials;

[0006] 2. Since the wound rotor motor in the prior art is generally cooled by an external fan, but there is no ventilation duct designed inside the base, the heat dissipation effect is poor, and the overall volume is large, which easily causes the local temperature of the motor to rise, reducing the service life of the motor;

[0007] 3. Since the high-end cover observation window cover of the medium-sized winding rotor in the prior art has a small opening and is designed with heat dissipation ribs, but the actual heat dissipation part of the motor is the iron core and the winding, which requires the base to dissipate heat, the heat dissipation ribs of the high-end cover are far away from the winding part and do not work, and the outer diameter of the high-end cover is limited;

[0008] 4. The winding rotor motor terminal box in the prior art is generally square or welded steel terminal box with a monotonous shape, which is not conducive to user wiring and has a very low material utilization rate;

[0009] 5. Since the bearing outer cover of the medium-sized wound rotor motor, the bearing outer cover of the overspeed switch, and the rotor dust shield in the prior art are mostly welded steel structures, which are turned from shaft materials or steel plates, the material cost is greatly wasted. Utility Model Content

[0010] In view of the above problems, the utility model provides a wound rotor motor, which aims to save the material cost of the motor; reduce the weight of the motor base; increase the heat dissipation area of ​​the motor; meet the different needs of users for wiring on both sides; facilitate the detection and protection of the motor; effectively prevent dust generated by the friction between the rotor collector ring and the carbon brush from entering the rotor; and facilitate user wiring.

[0011] In order to solve the above problems, the technical solution provided by the utility model is:

[0012] A wound rotor motor, comprising a front bearing outer cover, an end cover, a base, a junction box, a rotor dust shield, a bearing inner cover, a high end cover, and a rear bearing outer cover; wherein:

[0013] The junction box is arranged at the upper end of the motor housing; the junction box is provided with three cable entry holes and one temperature measuring element entry hole; the bottom of the junction box is a square structure;

[0014] The rotor dust shield is arranged on the inner side of the matching surface between the high end cover and the machine base.

[0015] Preferably, the machine base is provided with an end cover mounting bracket; there are 4 end cover mounting brackets in total, which are located at 45°, 135°, 225° and 315° respectively when looking directly at the machine base; the cross section of the end cover mounting bracket is a trapezoid;

[0016] The machine base is provided with a heat dissipation ventilation duct; the heat dissipation ventilation duct is a channel steel structure, and the end cover is installed with a bracket and a shell is drawn; the wall thickness of the heat dissipation ventilation duct is 20mm.

[0017] Preferably, three ventilation holes are opened inside the core of the base; the interval between two adjacent ventilation holes is 160 mm;

[0018] The opening sizes of the two ends of the vent are 250mm*200mm, and the size of the middle opening is 200mm*200mm; the vent divides the heat dissipation ventilation duct into three sections; the vent and the heat dissipation ventilation duct are distributed around the circumference.

[0019] Preferably, the wall thickness of the end cover is 15 mm; 8 first ribs 12 are evenly distributed on the inner side of the end cover; the width of the first rib 12 is 15 mm; 52 second ribs are distributed on the outer side of the end cover; the width of the second rib is 6 mm.

[0020] Preferably, a first observation window is provided on the top of the high-end cover; the size of the first observation window is 450mm*310mm; a second observation window is provided on each of the left and right sides of the high-end cover; the size of the second observation window is 360mm*270mm.

[0021] Preferably, an overspeed switch mounting boss is provided at the tail of the rear bearing outer cover; the outer diameter of the overspeed switch mounting boss is 135 mm.

[0022] Preferably, the junction box cover and the junction box seat of the junction box are inclined at 17° in the horizontal direction, and are sealed by the box cover buckle cap and the box seat boss; the lower edge of the box cover buckle cap extends out 15mm; and a grounding mounting boss is provided in the junction box seat.

[0023] Preferably, the size of the square structure of the bottom of the junction box is 320 mm*320 mm; the bottom of the junction box has the ability to rotate 180 degrees.

[0024] Compared with the prior art, the utility model has the following advantages:

[0025] 1. Since the parts of the utility model are re-molded, the appearance is novel and the structure is beautiful, so that the overall weight of the new motor is reduced by about 400kg, saving the cost of motor materials;

[0026] 2. Since the ventilation duct is added inside the base of the utility model, it not only reduces the weight of the base, but also effectively increases the heat dissipation area of ​​the motor;

[0027] 3. Since the left and right openings of the high-end cover of the utility model are both provided with rotor line outlets, the wiring can be connected by 180-degree rotation of the wiring box, thereby meeting the different needs of users for wiring on both sides;

[0028] 4. Since the rear bearing outer cover of the utility model is provided with an overspeed switch mounting boss, it is convenient for detecting and protecting the motor;

[0029] 5. Since the rotor dust shield of the utility model is made of molded plastic, it effectively prevents the dust generated by the friction between the rotor collector ring and the carbon brush from entering the rotor;

[0030] 6. Since the junction box seat and the junction box cover of the utility model adopt an inclined surface with an angle of 17 degrees to the horizontal, it is convenient for users to connect wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a semi-sectional schematic diagram of the internal structure of the utility model;

[0032] Figure 2 It is a schematic diagram of the vent of the utility model;

[0033] Figure 3 This is a schematic diagram of the heat dissipation structure of the base of the utility model;

[0034] Figure 4 It is a schematic diagram of the inner side of the end cover of the utility model;

[0035] Figure 5 It is a cross-sectional schematic diagram of the end cover of the utility model;

[0036] Figure 6 It is a schematic diagram of the outer side of the end cover of the utility model;

[0037] Figure 7 This is a schematic diagram of the appearance of the high-end cover of the utility model;

[0038] Figure 8 This is a schematic diagram of the appearance of the rear bearing outer cover of the utility model;

[0039] Fig. 9 This is a schematic diagram of the overall appearance of the junction box of the utility model;

[0040] Fig.10 It is a schematic diagram of a junction box cover of the junction box of the utility model;

[0041] Fig.11 It is a schematic diagram of the internal structure of the junction box of the utility model.

[0042] Among them: 1. Front bearing outer cover, 2. End cover, 3. Machine base, 4. Junction box, 5. Rotor dust shield, 6. Bearing inner cover, 7. High end cover, 8. Rear bearing outer cover, 9. End cover mounting bracket, 10. Heat dissipation ventilation duct, 11. Ventilation port, 12. First rib, 13. Second rib, 14. First observation window, 15. Second observation window, 16. Overspeed switch mounting boss, 17. Junction box cover, 18. Junction box seat, 19. Box cover buckle cap, 20. Box seat boss, 21. Grounding mounting boss. DETAILED DESCRIPTION

[0043] The present invention is further illustrated below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0044] like Figure 1 As shown, a wound rotor motor comprises a front bearing outer cover 1, an end cover 2, a base 3, a terminal box 4, a rotor dust shield 5, a bearing inner cover 6, a high end cover 7, and a rear bearing outer cover 8; wherein:

[0045] The junction box is arranged at the upper end of the motor housing; the junction box is provided with three cable entry holes and one temperature measuring element entry hole; the bottom of the junction box 4 is a square structure;

[0046] In this specific embodiment, the size of the square structure of the bottom of the junction box is 320 mm*320 mm; the bottom of the junction box has the ability to rotate 180 degrees.

[0047] The rotor dust shield 5 is arranged on the inner side of the mating surface between the high end cover 7 and the base 3 .

[0048] It should be noted that the base 3, end cover 2, high end cover 7, inner and outer bearing covers, terminal box 4, and rotor dust shield 5 in the utility model are each made of a dedicated mold; the purpose is to obtain good effects and economic benefits, and to provide a new medium-sized low-voltage winding rotor motor for lifting and metallurgy that has good heat dissipation, light weight, beautiful appearance, and meets the high power density of the motor.

[0049] It should be further explained that the entire base 3 is integrally formed by using a lost foam process.

[0050] In this specific embodiment, an end cover mounting bracket 9 is provided on the machine base 3; there are four end cover mounting brackets 9, which are located at 45°, 135°, 225°, and 315° respectively when looking directly at the machine base 3; the cross-section of the end cover mounting bracket 9 is a trapezoid.

[0051] In this specific embodiment, a heat dissipation ventilation duct 10 is provided on the base 3; the heat dissipation ventilation duct 10 is a channel steel structure, and the end cover mounting bracket 9 is withdrawn from the shell; the wall thickness of the heat dissipation ventilation duct 10 is 20 mm.

[0052] It should be noted that, in addition to the heat dissipation ribs, the base 3 also has a heat dissipation ventilation duct 10 .

[0053] like Figure 2 As shown, in this specific embodiment, three ventilation holes 11 are opened inside the core of the base 3; the interval between two adjacent ventilation holes is 160 mm.

[0054] like Figure 3 As shown, in this specific embodiment, the opening size of the two ends of the vent is 250mm*200mm, and the middle opening size is 200mm*200mm; the vent divides the heat dissipation ventilation duct 10 into three sections; the vent 11 and the heat dissipation ventilation duct 10 are distributed around the circumference.

[0055] In this specific embodiment, the wall thickness of the end cover 2 is 15 mm.

[0056] like Figure 4-5 As shown, in this specific embodiment, eight first ribs 12 are evenly distributed on the inner side of the end cover 2; the width of the first rib 12 is 15 mm.

[0057] like Figure 5-6 As shown, in this specific embodiment, 52 second ribs 13 are distributed on the outer side of the end cover 2; the width of the second rib 13 is 6 mm.

[0058] It should be noted that the end cover 2 is thinned to the maximum extent possible while satisfying the mechanical strength.

[0059] It should be further explained that at the same time, there are reinforcing ribs on the inside and outside of the end cover 2 to ensure strength.

[0060] like Figure 7 As shown, in this specific embodiment, a first observation window 14 is provided on the top of the high end cover 7; the size of the first observation window 14 is 450 mm*310 mm.

[0061] like Figure 7 As shown, in this specific embodiment, the high-end cover 7 is provided with a second observation window 15 on both sides thereof; the size of the second observation window 15 is 360 mm*270 mm.

[0062] It should be noted that the high-end cover 7 of the utility model eliminates the heat dissipation ribs used in the prior art, and then, while enlarging the outer circle size, opens three observation windows in the upper, left and right directions, namely, a first observation window 14 and two second observation windows 15, the purpose of which is to facilitate the user's wiring and maintenance.

[0063] In this specific embodiment, an overspeed switch mounting boss 16 is provided at the tail of the rear bearing outer cover 8 .

[0064] It should be noted that the front bearing outer cover 1, the rear bearing outer cover 8, and the bearing inner cover 6 of the present invention are all designed with a unified mold; specifically:

[0065] The front bearing outer cover 1 and the rear bearing outer cover 8 both have oil injection and discharge holes.

[0066] The bearing inner cover 6 has an oil storage groove.

[0067] like Figure 8 As shown, an overspeed switch mounting boss 16 is provided at the tail of the rear bearing outer cover 8.

[0068] In this specific embodiment, the outer diameter of the overspeed switch mounting boss 16 is 135 mm.

[0069] like Figures 9 to 11 As shown, in this specific embodiment, the junction box cover 17 and the junction box seat 18 of the junction box 4 are inclined at 17° in the horizontal direction, and are sealed by the box cover buckle cap 19 and the box seat boss 20.

[0070] In this specific embodiment, the lower edge of the box cover buckle cap 19 extends out by 15 mm.

[0071] like Figures 9 to 11 As shown, in this specific embodiment, a grounding mounting boss 21 is provided in the junction box seat 18 .

[0072] It should be noted that the junction box 4 is designed with an oblique opening and a mounting boss surface for the junction box seat 18 is provided on the junction box cover 17 , which serves to ensure the sealing of the junction box 4 .

[0073] It should be noted that the rotor dust shield 5 of the present invention is integrally formed of molded plastic, the purpose of which is to allow the finished product to be directly used for assembly without further processing, while also reducing labor time.

[0074] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than those clearly stated in each claim. On the contrary, as reflected in the attached claims, the utility model is in a state with less than all the features of the disclosed individual embodiments. Therefore, the attached claims are hereby expressly incorporated into the detailed description, with each claim acting alone as a separate preferred embodiment of the utility model.

[0075] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in the present application.

[0076] The above description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0077] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A wound rotor motor, characterized in that: It comprises a front bearing outer cover (1), an end cover (2), a machine base (3), a terminal box (4), a rotor dust shield (5), a bearing inner cover (6), a high end cover (7), and a rear bearing outer cover (8); wherein: The junction box (4) is arranged at the upper end of the motor housing; the junction box (4) is provided with three cable entry holes and one temperature measuring element entry hole; the bottom of the junction box (4) is a square structure; The rotor dust shield (5) is arranged on the inner side of the matching surface between the high end cover (7) and the machine base (3).

2. The wound rotor motor according to claim 1, characterized in that: The machine base (3) is provided with an end cover mounting bracket (9); there are four end cover mounting brackets (9) in total, which are located at 45°, 135°, 225° and 315° respectively when looking directly at the machine base (3); the cross section of the end cover mounting bracket (9) is a trapezoid; The machine base (3) is provided with a heat dissipation ventilation duct (10); the heat dissipation ventilation duct (10) is a channel steel structure, and the end cover mounting bracket (9) is withdrawn from the shell; the wall thickness of the heat dissipation ventilation duct (10) is 20 mm.

3. The wound rotor motor according to claim 2, characterized in that: Three ventilation holes (11) are provided inside the core of the machine base (3); the interval between two adjacent ventilation holes (11) is 160 mm; the opening size at both ends of the ventilation hole (11) is 250 mm*200 mm, and the size of the middle opening is 200 mm*200 mm; the ventilation holes (11) divide the heat dissipation ventilation duct (10) into three sections; the ventilation holes (11) and the heat dissipation ventilation duct (10) are distributed at four locations along the circumference.

4. The wound rotor motor according to claim 3, characterized in that: The wall thickness of the end cover (2) is 15 mm; 8 first ribs (12) are evenly distributed on the inner side of the end cover (2); the width of the first rib (12) is 15 mm; 52 second ribs (13) are distributed on the outer side of the end cover (2); the width of the second rib (13) is 6 mm.

5. The wound rotor motor according to claim 4, characterized in that: The top of the high-end cover (7) is provided with a first observation window (14); the size of the first observation window (14) is 450 mm*310 mm; the high-end cover (7) is provided with a second observation window (15) on each of the left and right sides; the size of the second observation window (15) is 360 mm*270 mm.

6. The wound rotor motor according to claim 5, characterized in that: An overspeed switch mounting boss (16) is provided at the tail of the rear bearing outer cover (8); the outer diameter of the overspeed switch mounting boss (16) is 135 mm.

7. The wound rotor motor according to claim 6, characterized in that: The junction box cover (17) and the junction box seat (18) of the junction box (4) are inclined at a 17° angle in the horizontal direction and are sealed by a box cover buckle cap (19) and a box seat boss (20); the lower edge of the box cover buckle cap (19) protrudes 15 mm; and a grounding mounting boss (21) is provided in the junction box seat (18).

8. The wound rotor motor according to claim 7, characterized in that: The size of the square structure of the bottom of the junction box (4) is 320 mm*320 mm; the bottom of the junction box (4) has the ability to rotate 180 degrees.

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