Mining permanent magnet motor with braking function

Abstract

The invention discloses a mining permanent magnet motor with a braking function, and relates to the technical field of motor equipment, the mining permanent magnet motor comprises a permanent magnet motor shell and a rotating shaft, the tail end of the rotating shaft is connected with a cooling fan, and the mining permanent magnet motor further comprises a braking structure arranged in the permanent magnet motor shell; the braking structure comprises a rotor core, the rotor core is fixed on the outer surface of the rotating shaft, a permanent magnet is embedded in the rotor core, a stator core is installed on the inner wall of the permanent magnet motor shell, a stator winding is installed on the inner wall of the stator core, a first groove is formed in the inner wall of the middle of the permanent magnet motor shell, and a second groove is formed in the inner wall of the middle of the permanent magnet motor shell. A plurality of sets of arc-shaped grooves are formed in the two sides of the first groove, when the friction ring extrudes the second groove, friction force can be generated to reduce the rotating speed of the rotor iron core, meanwhile, when the limiting grooves correspond to the protruding pieces in position, the protruding pieces can be embedded into the inner sides of the limiting grooves to limit rotation of the rotor iron core, and therefore the braking effect is achieved; the occupied space is small, and the load is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of motor equipment, in particular to a mining permanent magnet motor with a braking function. Background Art

[0002] A permanent magnet motor is a motor that uses permanent magnets to provide excitation. The working principles of permanent magnet motors are divided into two modes: one is to control the motor to achieve synchronization through a variable frequency speed regulator, and the other is to achieve synchronization through asynchronous starting. When the rotor's rotating magnetic field is almost synchronized with the stator's rotating magnetic field, the rotor winding does not generate induced current, and only the permanent magnet generates a magnetic field to generate driving torque.

[0003] Permanent magnet motors have the advantages of small size, light weight and high efficiency. They are often used in mines. The permanent magnet motors in the prior art have two braking methods: permanent magnet brakes and electromagnetic brakes. Since the two brakes are independently installed inside the motor and the permanent magnet motor itself is small in size, the permanent magnet brake and electromagnetic brake will cause the internal structure of the motor to be messy and increase the weight of the permanent magnet motor, making it difficult to carry the permanent magnet motor. Summary of the invention

[0004] The purpose of the present invention is to make up for the deficiencies of the prior art and provide a mining permanent magnet motor with a braking function.

[0005] To achieve the above object, the present invention provides the following technical solution: a permanent magnet motor for mining with a braking function, comprising a permanent magnet motor housing and a rotating shaft, wherein a heat dissipation fan is connected to the rear end of the rotating shaft, and further comprising: A brake structure, which is arranged inside the permanent magnet motor housing and is used to control the deceleration and stop of the rotating shaft; Among them, the braking structure includes a rotor core, which is fixed on the outer surface of the rotating shaft, and the interior of the rotor core is inlaid with permanent magnets. The inner wall of the permanent magnet motor housing is installed with a stator core, and the inner wall of the stator core is installed with a stator winding. A first groove is provided on the inner wall of the middle part of the permanent magnet motor housing, and a plurality of groups of arc grooves are provided on both sides of the first groove. An arc shaft is installed inside the arc groove, and an arc block and a first spring are sleeved on the outer surface of the arc shaft. A connecting shaft is connected between the two groups of arc blocks, and a brake disc is slidably connected to the outer surface of the connecting shaft. A fixing ring is installed on the inner wall of the brake disc, and a plurality of groups of protrusions are installed on the inner wall of the fixing ring. A movable part and a second spring are sleeved inside the fixing ring, and a friction ring is installed on the end of the movable part. A second groove is provided on one side of the rotor core and the permanent magnet, and a plurality of groups of limit grooves are provided on the inner wall of the second groove.

[0006] As a preferred solution of the present invention, there is a gap between the rotor core and the stator core, the cross-section of the rotor core and the permanent magnet is stepped, and one end of the rotor core and the permanent magnet is located in the middle of the stator core.

[0007] As a preferred solution of the present invention, the fixing ring is made of iron, and the fixing ring is attracted to the stator core after power is supplied.

[0008] As a preferred solution of the present invention, one side of the fixing ring protrudes toward the second groove, and the fixing ring is sleeved with the second groove.

[0009] As a preferred solution of the present invention, the friction ring is in compression contact with the second groove, and the second spring is elastically supported between the movable part and the fixed ring.

[0010] As a preferred solution of the present invention, the permanent magnet is used as a braking magnet, the surface of the fixing ring rubs against the inner wall of the second groove, the friction ring is in compression contact with the inner side of the second notch, and the rotor core cooperates with the fixing ring to generate braking magnetic force.

[0011] As a preferred solution of the present invention, the protrusion is movably engaged with the limiting groove, the friction ring is made of wear-resistant steel, and the surface of the friction ring is rough.

[0012] As a preferred solution of the present invention, the number of the first springs on each group of the arc-shaped shaft surface is two groups, the two groups of the first springs are respectively located on both sides of the arc block, and the first springs are elastically supported between the arc groove and the arc block.

[0013] As a preferred solution of the present invention, the rotor core drives the arc block to press the first spring through the connecting shaft.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention cooperates between the brake disc and the connecting shaft. When the permanent magnet motor stops running, the stator core will be powered off. At this time, the stator core will lose its magnetic force, and the magnetic force of the permanent magnet will adsorb the fixed ring. At this time, the fixed ring will drive the brake disc to slide along the outer surface of the connecting shaft, so that the friction ring is embedded in the inner wall of the second groove, and the second groove will squeeze the friction ring and drive the movable part to slide along the inner side of the fixed ring. When the friction ring squeezes the second groove, friction will be generated to reduce the rotation speed of the rotor core. At the same time, when the position of the limiting groove corresponds to that of the protruding piece, the protruding piece will be embedded in the inner side of the limiting groove to limit the rotation of the rotor core, thereby playing a braking role, and occupying less space, reducing its load.

[0015] 2. The present invention supports the friction ring through the movable part through the elastic force of the second spring, so the friction force between the friction ring and the second groove will change with the moving distance of the fixed ring, and with the change of the moving distance of the fixed ring, the rotation speed of the rotor core will be initially reduced through the friction ring, and then the protrusion and the limit groove will be clamped together, which can avoid the protrusion and the limit groove from being clamped when the rotor core rotates at high speed, prevent the protrusion from being subjected to large torque, and improve its service life.

[0016] 3. The present invention, through the cooperation between the protrusion and the limit groove, can drive the brake disc to rotate through the fixed ring when the rotor core rotates. At the same time, through the cooperation between the rotor core and the connecting shaft, it can drive the arc block to move along the outer surface of the arc shaft. At this time, the arc block will be supported by the elastic force of the first spring, so as to buffer the rotation force of the rotor core, avoid the arc block from directly colliding with foreign objects, and thus improve its durability.

[0017] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic cross-sectional structural diagram of the side of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 4 It is a cross-sectional structural schematic diagram of the back side of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at B in the middle; Figure 6 It is a schematic diagram of the disassembly structure inside the permanent magnet motor of the present invention; Figure 7 It is a schematic diagram of the disassembly structure of the brake disc of the present invention.

[0019] In the figure: 1, permanent magnet motor housing; 2, rotating shaft; 3, cooling fan; 4, rotor core; 5, permanent magnet; 6, stator core; 7, stator winding; 8, first groove; 9, arc groove; 10, arc shaft; 11, arc block; 12, first spring; 13, connecting shaft; 14, brake disc; 15, protrusion; 16, fixing ring; 17, movable part; 18, second spring; 19, friction ring; 20, second groove; 21, limit groove. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0021] like Figure 1-7 As shown, the present invention provides a mining permanent magnet motor with a braking function, comprising a permanent magnet motor housing 1 and a rotating shaft 2, wherein a heat dissipation fan 3 is connected to the rear end of the rotating shaft 2, and further comprising: A brake structure, which is arranged inside the permanent magnet motor housing 1 and is used to control the deceleration and stop of the rotating shaft 2; The braking structure includes a rotor core 4, which is fixed to the outer surface of the rotating shaft 2, and a permanent magnet 5 is embedded inside the rotor core 4. A stator core 6 is installed on the inner wall of the permanent magnet motor housing 1, and a stator winding 7 is installed on the inner wall of the stator core 6. A first groove 8 is opened on the inner wall of the middle part of the permanent magnet motor housing 1, and a plurality of groups of arc grooves 9 are opened on both sides of the first groove 8. An arc shaft 10 is installed inside the arc groove 9, and an arc block 11 and a first spring are sleeved on the outer surface of the arc shaft 10. 12, a connecting shaft 13 is connected between the two groups of arc blocks 11, a brake disc 14 is slidably connected to the outer surface of the connecting shaft 13, a fixing ring 16 is installed on the inner wall of the brake disc 14, a plurality of groups of protrusions 15 are installed on the inner wall of the fixing ring 16, a movable part 17 and a second spring 18 are sleeved inside the fixing ring 16, a friction ring 19 is installed on the end of the movable part 17, a second groove 20 is opened on one side of the rotor core 4 and the permanent magnet 5, and a plurality of groups of limit grooves 21 are opened on the inner wall of the second groove 20.

[0022] Through the cooperation between the brake disc 14 and the connecting shaft 13, when the permanent magnet motor stops running, the stator core 6 will be powered off, and the stator core 6 will lose its magnetic force, while the magnetic force of the permanent magnet 5 will adsorb the fixing ring 16. At this time, the fixing ring 16 will drive the brake disc 14 to slide along the outer surface of the connecting shaft 13, so that the friction ring 19 is embedded in the inner wall of the second groove 20, and the second groove 20 will squeeze the friction ring 19 and drive the movable part 17 to slide along the inner side of the fixing ring 16. When the friction ring 19 squeezes the second groove 20, friction will be generated to reduce the rotation speed of the rotor core 4. At the same time, when the position of the limiting groove 21 corresponds to that of the protruding piece 15, the protruding piece 15 will be embedded in the inner side of the limiting groove 21 to limit the rotation of the rotor core 4, thereby braking the rotating shaft 2, and occupying less space, reducing its load.

[0023] like Figure 2As shown, there is a gap between the rotor core 4 and the stator core 6, and the first groove 8 is located in the rotor core 4 and the stator core 6. The cross-section of the rotor core 4 and the permanent magnet 5 is stepped, and one end of the rotor core 4 and the permanent magnet 5 is located in the middle of the stator core 6.

[0024] Through the design of the rotor core 4 and the permanent magnet 5, since they are partially located in the middle of the stator core 6, when the stator core 6 is running, the interaction between the magnetic field generated by the permanent magnet 5 and the rotating magnetic field generated by the stator core 6 will not interfere with its normal operation.

[0025] like Figure 2 , 3 As shown, the fixing ring 16 is made of iron, and the fixing ring 16 is attracted to the stator core 6 after being energized.

[0026] Through the design of the fixing ring 16, since the fixing ring 16 is made of iron, it can be attracted by magnetic force. When the stator core 6 is energized, magnetic force will be generated, thereby adsorbing the fixing ring 16 and separating it from the second groove 20. At this time, the rotor core 4 and the shaft 2 can rotate.

[0027] like Figure 3 , 7 As shown, one side of the fixing ring 16 protrudes toward the second groove 20 , and the fixing ring 16 is sleeved with the second groove 20 .

[0028] Through the design of the fixing ring 16, since one side of the fixing ring 16 protrudes toward the second groove 20, when it is adsorbed by the permanent magnet 5, the friction ring 19 will rub against the second groove 20, thereby slowing down the permanent magnet 5 and achieving a braking effect.

[0029] like Figure 2 , 3 As shown, the friction ring 19 is in compression contact with the second groove 20 , and the second spring 18 is elastically supported between the movable member 17 and the fixed ring 16 .

[0030] Through the design of the second spring 18, the movable part 17 has good elastic reset performance. At this time, since the second spring 18 is in a compressed state, it will apply an elastic force to the movable part 17, so that the friction ring 19 can be supported. Therefore, the friction between the friction ring 19 and the second groove 20 will change with the moving distance of the fixed ring 16. After the rotation speed of the rotor core 4 is initially reduced, the protrusion 15 and the limiting groove 21 are clamped again, which can avoid the protrusion 15 being subjected to a large torque due to the excessive rotation speed of the rotor core 4 when the protrusion 15 and the limiting groove 21 are clamped, thereby improving its service life.

[0031] like Figure 2 , 3As shown, the permanent magnet 5 is used as a braking magnet, the surface of the fixing ring 16 rubs against the inner wall of the second groove 20, the friction ring 19 is pressed into contact with the inner side of the second notch 20, and the rotor core 4 cooperates with the fixing ring 16 to generate braking magnetic force.

[0032] Through the cooperation between the friction ring 19 and the fixing ring 16 and the second groove 20, it can be embedded in the second groove 20, so that the rotation speed can be reduced through the cooperation between the friction ring 19 and the second groove 20, and the friction force can be further improved through the cooperation between the limit groove 21 and the fixing ring 16.

[0033] like Figure 3 , 4 As shown, the protrusion 15 is movably engaged with the limiting groove 21, the friction ring 19 is made of wear-resistant steel, and the surface of the friction ring 19 is rough.

[0034] Through the design of the friction ring 19 , since the friction ring 19 is made of wear-resistant steel, its service life can be increased. At the same time, since the surface of the friction ring 19 is rough, the friction between the friction ring 19 and the second groove 20 can be increased.

[0035] like Figure 5 As shown, there are two groups of first springs 12 on the surface of each group of arc shafts 10 , the two groups of first springs 12 are respectively located on both sides of the arc block 11 , and the first springs 12 are elastically supported between the arc groove 9 and the arc block 11 .

[0036] Through the design of the first spring 12, when the protrusion 15 is engaged with the limit groove 21, the rotation of the rotor core 4 will drive the brake disc 14 to rotate. At the same time, through the cooperation between the rotor core 4 and the connecting shaft 13, the arc block 11 can be driven to move along the outer surface of the arc shaft 10. At this time, the arc block 11 will be supported by the elastic force of the first spring 12, so that the rotation force of the rotor core 4 can be buffered, thereby improving its durability.

[0037] like Figure 2 , 5 As shown, when the rotor core 4 rotates, the arc piece 11 is driven to press the first spring 12 through the connecting shaft 13 .

[0038] Through the cooperation between the arc block 11 and the arc shaft 10, when the arc block 11 moves along the outer surface of the arc shaft 10, the first spring 12 will be compressed, so that it can buffer the rotational force of the brake disc 14. Since the first spring 12 is in two groups, it can buffer the rotating shaft 2 when it rotates clockwise or counterclockwise.

[0039] Working principle: When the rotating shaft 2 needs to be braked, the stator core 6 is controlled to be powered off. At this time, the stator core 6 will lose its magnetic force, and the magnetic force of the permanent magnet 5 will attract the fixing ring 16, so that the fixing ring 16 can move toward the rotor core 4 along the outer surface of the connecting shaft 13 through the brake disc 14 through the cooperation between the brake disc 14 and the connecting shaft 13. When the brake disc 14 moves, it will drive the friction ring 19 to embed into the inner wall of the second groove 20, so that the friction force between the friction ring 19 and the second groove 20 is tested, and the rotor core 4 and the rotating shaft 2 are preliminarily decelerated. Under the elastic force of the second spring 18, the second groove 20 will squeeze the friction ring 19 and drive the active The moving member 17 slides along the inner side of the fixing ring 16. At this time, through the cooperation between the protrusion 15 and the limiting groove 21, when the position of the limiting groove 21 corresponds to that of the protrusion 15, the protrusion 15 will be embedded in the inner side of the limiting groove 21. At this time, the rotation of the rotor core 4 will drive the brake disc 14 to rotate through the fixing ring 16. At the same time, through the cooperation between the brake disc 14 and the connecting shaft 13, the arc block 11 will be driven to move along the outer surface of the arc shaft 10, and the arc block 11 will be supported by the elastic force of the first spring 12, so as to buffer the torque of the rotor core 4 and the rotating shaft 2 and stop its rotation, so as to quickly brake the rotating shaft 2.

[0040] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet motor for mining with a braking function, comprising a permanent magnet motor housing (1) and a rotating shaft (2), wherein a heat dissipation fan (3) is connected to the rear end of the rotating shaft (2), characterized in that: Also includes: A braking structure, which is arranged inside the permanent magnet motor housing (1) and is used to control the deceleration and stop of the rotating shaft (2); The braking structure comprises a rotor core (4), the rotor core (4) being fixed to the outer surface of the rotating shaft (2), a permanent magnet (5) being embedded inside the rotor core (4), a stator core (6) being mounted on the inner wall of the permanent magnet motor housing (1), a stator winding (7) being mounted on the inner wall of the stator core (6), a first groove (8) being provided on the inner wall of the middle portion of the permanent magnet motor housing (1), a plurality of groups of arc grooves (9) being provided on both sides of the first groove (8), an arc shaft (10) being mounted inside the arc groove (9), and an arc block (11) and a first spring (11) being sleeved on the outer surface of the arc shaft (10). 12), a connecting shaft (13) is connected between the two groups of arc blocks (11), a brake disc (14) is slidably connected to the outer surface of the connecting shaft (13), a fixing ring (16) is installed on the inner wall of the brake disc (14), a plurality of groups of protrusions (15) are installed on the inner wall of the fixing ring (16), a movable part (17) and a second spring (18) are sleeved inside the fixing ring (16), a friction ring (19) is installed on the end of the movable part (17), a second groove (20) is opened on one side of the rotor core (4) and the permanent magnet (5), and a plurality of groups of limit grooves (21) are opened on the inner wall of the second groove (20).

2. The mining permanent magnet motor with braking function according to claim 1 is characterized in that: There is a gap between the rotor core (4) and the stator core (6); the cross-sections of the rotor core (4) and the permanent magnet (5) are stepped, and one end of the rotor core (4) and the permanent magnet (5) is located in the middle of the stator core (6).

3. The mining permanent magnet motor with braking function according to claim 1 is characterized in that: The fixing ring (16) is made of iron, and the fixing ring (16) is attracted to the stator core (6) after power is supplied.

4. The mining permanent magnet motor with braking function according to claim 1 is characterized in that: One side of the fixing ring (16) protrudes in the direction of the second groove (20), and the fixing ring (16) is sleeved with the second groove (20).

5. The mining permanent magnet motor with braking function according to claim 1 is characterized in that: The friction ring (19) is in compression contact with the second groove (20), and the second spring (18) is elastically supported between the movable part (17) and the fixed ring (16).

6. The mining permanent magnet motor with braking function according to claim 1 is characterized in that: The permanent magnet (5) is used as a braking magnetic steel, the surface of the fixing ring (16) rubs against the inner wall of the second groove (20), the friction ring (19) is in compression contact with the inner side of the second notch (20), and the rotor core (4) cooperates with the fixing ring (16) to generate a braking magnetic force.

7. The mining permanent magnet motor with braking function according to claim 1 is characterized in that: The protruding piece (15) is movably engaged with the limiting groove (21); the friction ring (19) is made of wear-resistant steel, and the surface of the friction ring (19) is rough.

8. The mining permanent magnet motor with braking function according to claim 1 is characterized in that: The number of first springs (12) on the surface of each group of the arc-shaped shaft (10) is two groups, the two groups of first springs (12) are respectively located on both sides of the arc block (11), and the first springs (12) are elastically supported between the arc groove (9) and the arc block (11).

9. The mining permanent magnet motor with braking function according to claim 1, characterized in that: The rotor core (4) drives the arc block (11) to press the first spring (12) via the connecting shaft (13).

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