Motor rotor voltage equalizing structure

Abstract

The utility model relates to a motor rotor voltage-sharing structure, which comprises a rotating shaft, the outer surface of the rotating shaft is sleeved with a commutator and a rotor core, the peripheral side, facing the rotor core, of the commutator is uniformly provided with a plurality of hooks and tail hooks at equal intervals, the hooks and the tail hooks are arranged in one-to-one correspondence, and the hooks and the corresponding tail hooks are arranged oppositely. Each group of the starting hooks and the tail hooks are connected through the voltage equalizing wires, and the starting hooks and the tail hooks which are oppositely arranged are connected and conducted through the voltage equalizing wires in a winding manner, so that the relative positions of the commutator are equipotential, the current is more uniformly distributed in each branch, and the voltage stability during the operation of the motor is kept. The method has the effect of improving the operation stability of the motor.

Description

Technical Field

[0001] The present application relates to the technical field of motor rotors, and in particular to a motor rotor pressure balancing structure. Background Art

[0002] Motors are widely used in industrial production and daily life, especially in electric vehicles, household appliances and other fields. The stability and reliability of motors directly affect the normal operation and service life of related equipment. Brushed motors are a common type of motor. They usually use brushes fixed on the end cover to make sliding contact with the commutator assembled on the rotor to realize power supply to the rotor winding.

[0003] However, in a multi-tooth brushed motor, the angle between the motor poles becomes smaller, and one brush needs to correspond to more magnetic poles. Due to the increase in the number of magnetic poles, each brush has to share the current collection and conduction tasks under more poles. However, due to the unevenness of factors such as the internal magnetic field distribution and winding resistance of the motor, the branch currents contacted by each brush are difficult to distribute evenly. Therefore, when the brush corresponds to multiple poles, the current will tend to flow through the branch with smaller resistance, resulting in current imbalance between different brushes, and then causing voltage imbalance; at the same time, the current density passing through the branch with smaller resistance is higher. According to Joule's law, more heat will be generated at the branch with smaller resistance, causing the local temperature to rise, which in turn easily causes carbon brush sparks.

[0004] Therefore, in multi-tooth motors, the increase in the number of motor poles can easily lead to voltage imbalance, and at the same time, carbon brush sparks can easily be caused when the motor is running, seriously interfering with the stability of the motor operation, which is an obvious shortcoming. Utility Model Content

[0005] In order to improve the stability of motor operation, the present application provides a motor rotor pressure equalizing structure.

[0006] The present application provides a motor rotor pressure balancing structure that adopts the following technical solution:

[0007] A motor rotor pressure balancing structure includes a rotating shaft, a commutator and a rotor core are sleeved on the outer surface of the rotating shaft, and a plurality of starting hooks and tail hooks are evenly and equidistantly arranged on the outer peripheral side of the commutator facing the rotor core. The starting hooks and the tail hooks are arranged in a one-to-one correspondence, and the starting hooks are arranged opposite to the corresponding tail hooks. Each group of the starting hooks and the tail hooks are connected by a pressure balancing line.

[0008] By adopting the above technical solution, the relatively set starting hook and tail hook are connected by winding the equalizing wire to achieve phase conduction, so that the relative position of the commutator can achieve equal potential, so that the current is more evenly distributed in each branch, thereby maintaining the voltage stability during motor operation. At the same time, the setting of the equalizing wire prevents the current from tending to flow through the branch with smaller resistance, thereby reducing the risk of local temperature increase causing carbon brush sparks, and improving the stability of the motor during operation.

[0009] Optionally, a plurality of grooves are evenly and equidistantly provided on the outer peripheral side of the commutator.

[0010] By adopting the above technical solution, the setting of the grooves increases the heat dissipation area of the commutator, which is beneficial to the dissipation of heat generated by the contact surface between the brush and the commutator during the operation of the motor, thereby further reducing the possibility of carbon brush sparks. At the same time, the evenly distributed grooves can make the contact between the brush and the commutator more stable and uniform, reducing voltage fluctuations and current unevenness caused by poor contact, thereby improving the stability of the motor operation.

[0011] Optionally, a plurality of through slots are uniformly and equidistantly provided on the outer circumference of the rotor core.

[0012] By adopting the above technical solution, the through slots can facilitate the winding and wiring of the windings. The winding workers use the through slots to better arrange the position and direction of the windings, so that the windings can be more neatly and tightly wound on the rotor core, thereby improving the quality and efficiency of the winding. At the same time, the setting of the through slots increases the contact area between the rotor core and the air, thereby improving the heat dissipation efficiency of the motor rotor and improving the stability of the motor operation.

[0013] Optionally, a plurality of wire blocking plates are evenly and equidistantly arranged on the outer peripheral side of the rotor core, the through slot is arranged between two adjacent wire blocking plates, and the wire blocking plates are in a "T"-shaped structure.

[0014] By adopting the above technical solution, the "T"-shaped wire stopper can block and limit the winding on both sides, ensuring that the winding always remains in the correct position, preventing the winding from affecting the performance and reliability of the motor due to the action of rotation and electromagnetic force or loosening.

[0015] Optionally, the rotor core is provided with mounting grooves corresponding one-to-one to the plurality of wire blocking plates, the wire blocking plates are slidably connected in the corresponding mounting grooves, and connecting components corresponding one-to-one to the wire blocking plates are provided at opposite ends of the rotor core, and the wire blocking plates are detachably connected to the rotor core through the connecting components.

[0016] By adopting the above technical solution, the setting of the connecting component realizes a detachable connection between the wire block plate and the rotor core. When the winding in the rotor core fails, the worker removes the damaged part of the wire block plate through the connecting component, and then directly contacts the winding for inspection or replacement. This setting omits the complicated disassembly operation of removing the entire rotor, greatly reduces the worker's maintenance time, and improves the worker's maintenance efficiency.

[0017] Optionally, through holes are provided at both opposite ends of the rotor core, and the connecting assembly includes a latch rod slidably connected to the through hole, and a latch hole is provided on the wire baffle plate to engage with the latch rod, and a spring is sleeved on the outer surface of the latch rod, one end of the spring is connected to the inner wall of the through hole and the other end is connected to the latch rod. When the spring is in a natural state, the latch rod is engaged in the latch hole, and a guide slope is provided on the latch rod to slide with the wire baffle plate.

[0018] By adopting the above technical solution, when it is necessary to remove the wire baffle, the worker pulls the latch rod to disengage the latch rod from the latch hole, and the spring is compressed. Then the worker pulls the wire baffle upward to disengage the wire baffle from the installation slot, and the removal of the wire baffle is completed; after the inspection or replacement is completed, the worker places the wire baffle into the installation slot. During the process of placing the wire baffle, the wire baffle pushes the latch rod toward the direction away from the latch hole through the guide slope, and the spring is compressed. When the latch hole moves to face the latch rod, the pressure on the spring disappears, and the spring pushes the latch rod into the latch hole, and the fixing work of the wire baffle is completed.

[0019] Optionally, a heat dissipation component is provided on the rotating shaft, and the heat dissipation component includes a heat dissipation plate mounted on the outer surface of the rotating shaft, and a plurality of heat dissipation blades are provided on the surface of the heat dissipation plate, and the plurality of heat dissipation blades are evenly distributed circumferentially on the outer surface of the rotating shaft, and the heat dissipation plate is provided with heat dissipation grooves corresponding to the plurality of through grooves one by one, and the heat dissipation grooves are connected to the corresponding through grooves.

[0020] By adopting the above technical solution, when the shaft rotates, it drives the heat sink to rotate, and the heat sink drives the heat sink blades to rotate and generate airflow. The airflow flows from the heat dissipation holes to the through slots. When the airflow passes through quickly, it takes away the heat absorbed by the rotor core, thereby achieving air cooling of the rotor core, further improving the heat dissipation effect of the motor rotor, reducing the adverse effects of heat accumulation on the winding resistance and magnetic field, and further improving the stability of the motor during operation.

[0021] Optionally, the voltage-equalizing wire is made of copper alloy, and an outer surface of the voltage-equalizing wire is coated with an insulating layer.

[0022] By adopting the above technical solution, copper alloy can conduct current more efficiently, ensuring that the potential difference between each branch can be quickly balanced through the equalizing wire during the operation of the motor, thereby improving the stability of the motor. The insulation layer can protect the equalizing wire from the influence of external environmental factors, extend the service life of the equalizing wire, and thus improve the overall reliability and durability of the motor.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. This application provides a starting hook, a tail hook, and a voltage-equalizing wire. The starting hook and tail hook, which are arranged opposite to each other, are connected by winding the voltage-equalizing wire to conduct electricity. This allows the relative positions of the commutators to achieve equal potential, thereby more evenly distributing the current in each branch, thereby maintaining voltage stability during motor operation. At the same time, the provision of the voltage-equalizing wire prevents the current from tending to flow through the branch with lower resistance, thereby reducing the risk of carbon brush sparks caused by local temperature rise, and improving the stability of the motor during operation.

[0025] 2. This application provides a connection assembly that realizes a detachable connection between the wire retaining plate and the rotor core. When a winding in the rotor core fails, workers can remove the damaged wire retaining plate through the connection assembly and then directly access the winding for repair or replacement. This configuration omits the complex disassembly operation of removing the entire rotor, greatly reducing workers' maintenance time and improving their maintenance efficiency.

[0026] 3. The present application sets up a heat dissipation component. When the rotating shaft rotates, the heat dissipation plate is driven to rotate. The heat dissipation plate drives the heat dissipation blades to rotate and generate airflow. The airflow flows from the heat dissipation holes to the through slots. When the airflow passes through quickly, it takes away the heat absorbed by the rotor core, thereby achieving air cooling of the rotor core, further improving the heat dissipation effect of the motor rotor, reducing the adverse effects of heat accumulation on the winding resistance and magnetic field, and further improving the stability of the motor during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of Example 1 of the present application.

[0028] Figure 2 It is a side view of the commutator in Example 1 of the present application.

[0029] Figure 3 This is a side view of the rotor core in Example 1 of the present application.

[0030] Figure 4 This is a cross-sectional view of the rotor core in Example 2 of the present application.

[0031] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0032] Figure 6 It is a structural schematic diagram of the heat dissipation component in Example 3 of the present application.

[0033] Explanation of the accompanying reference numerals: 1. rotating shaft; 2. commutator; 3. rotor core; 21. hook; 22. tail hook; 23. equalizing wire; 24. groove; 31. through groove; 4. wire blocking plate; 5. mounting groove; 6. connecting assembly; 7. through hole; 61. latch rod; 41. latch hole; 62. spring; 611. guide slope; 8. heat dissipation assembly; 81. heat dissipation plate; 82. heat dissipation blade; 811. heat dissipation slot. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-6 This application is described in further detail.

[0035] The embodiments of the present application disclose a motor rotor pressure balancing structure.

[0036] Example 1

[0037] Reference Figure 1 and Figure 2 A motor rotor balancing structure includes a rotating shaft 1, a commutator 2 and a rotor core 3 are fixedly sleeved on the outer surface of the rotating shaft 1, and the rotor core 3 is formed by a combination of multiple block cores. The commutator 2 is evenly and evenly provided with multiple hooks 21 and tail hooks 22 on the outer peripheral side of the rotor core 3. The hooks 21 and the tail hooks 22 are arranged in a one-to-one correspondence, and the hooks 21 and the corresponding tail hooks 22 are arranged opposite to each other. In this embodiment, the number of the hooks 21 and the tail hooks 22 are both 11. The motor in this embodiment is a four-carbon brush twenty-two-tooth motor. A group of hooks 21 and tail hooks 22 are welded together by a balancing wire 23. Each balancing wire 23 is made of copper alloy, and the outer surface of the balancing wire 23 is coated with an insulating layer.

[0038] The relatively arranged starting hook 21 and tail hook 22 are connected by winding the equalizing wire 23 to achieve phase conduction, so that the relative position of the commutator 2 can achieve equal potential, so that the current is more evenly distributed in each branch, thereby maintaining the voltage stability when the motor is running. At the same time, the setting of the equalizing wire 23 prevents the current from tending to flow through the branch with smaller resistance, thereby reducing the risk of local temperature increase causing carbon brush sparks, and improving the stability of the motor during operation.

[0039] Reference Figure 1 and Figure 2A plurality of grooves 24 are evenly and equidistantly provided on the outer periphery of the commutator 2. The length directions of the plurality of grooves 24 are parallel to the axial direction of the rotating shaft 1. In this embodiment, the number of the grooves 24 is 11. The arrangement of the grooves 24 increases the heat dissipation area of the commutator 2, which is beneficial to the dissipation of heat generated by the contact surface between the brush and the commutator 2 during the operation of the motor, thereby further reducing the possibility of carbon brush sparks. At the same time, the evenly distributed grooves 24 can make the contact between the brush and the commutator 2 more stable and uniform, reduce the voltage fluctuation and current unevenness caused by poor contact, and thus improve the stability of the motor operation.

[0040] Reference Figure 1 and Figure 3 A plurality of through slots 31 are evenly and equidistantly provided on the outer circumference of the rotor core 3. The length directions of the plurality of through slots 31 are parallel to the axial direction of the rotating shaft 1. A plurality of wire blocking plates 4 are fixedly connected to the rotor core 3. The plurality of wire blocking plates 4 are evenly and equidistantly distributed on the outer circumference of the rotor core 3 in a circular shape. Each through slot 31 is arranged between two adjacent wire blocking plates 4. Each wire blocking plate 4 has a T-shaped structure. In this embodiment, the number of wire blocking plates 4 is 22 and the number of through slots 31 is 11.

[0041] The through slot 31 can facilitate the winding and wiring of the winding. The winding workers use the through slot 31 to better arrange the position and direction of the winding, so that the winding can be more neatly and tightly wound on the rotor core 3, thereby improving the quality and efficiency of the winding. The "T"-shaped wire baffle 4 can block and limit the winding on both sides, ensuring that the winding always remains in the correct position, and preventing the winding from affecting the performance and reliability of the motor due to the action of rotation and electromagnetic force or loosening.

[0042] The implementation principle of a motor rotor voltage equalizing structure in an embodiment of the present application is: the relatively arranged starting hook 21 and tail hook 22 are connected and conducted through the voltage equalizing wire 23, so that the relative position of the commutator 2 is equal to the potential, so that the current is more evenly distributed in each branch, thereby maintaining the voltage stability during the operation of the motor. At the same time, the setting of the voltage equalizing wire 23 prevents the current from tending to flow through the branch with smaller resistance, thereby reducing the risk of local temperature increase causing carbon brush sparks, and improving the stability of the motor during operation.

[0043] Example 2

[0044] Reference Figure 4 and Figure 5 The difference between this embodiment and embodiment 1 is that the rotor core 3 is provided with mounting grooves 5 corresponding to multiple wire blocking plates 4, and the wire blocking plates 4 are slidably connected in the corresponding mounting grooves 5. The rotor core 3 is parallel to the length direction of the rotating shaft 1 on both sides opposite to each other and is provided with connecting components 6 corresponding to the wire blocking plates 4. The wire blocking plates 4 are detachably connected to the rotor core 3 through the connecting components 6.

[0045] Reference Figure 4 and Figure 5 , through holes 7 corresponding to multiple wire blocks 4 are provided at both opposite ends of the rotor core 3, and the connecting assembly 6 includes a latch rod 61 slidably connected to the through hole 7, and the length direction of the latch rod 61 is parallel to the axial direction of the rotating shaft 1. The wire block 4 is provided with a latch hole 41 that is snap-fitted with the latch rod 61, and the outer surface of each latch rod 61 is sleeved with a spring 62, one end of the spring 62 is fixedly connected to the inner wall of the through hole 7, and the other end is fixedly connected to the outer surface of the latch rod 61. In the natural state of the spring 62, the latch rod 61 is snapped into the latch hole 41, and the end of the latch rod 61 facing the latch hole 41 is provided with a guide inclined surface 611 that slides with the wire block 4.

[0046] The implementation principle of Example 2 of the present application is: when the wire baffle 4 needs to be removed, the worker pulls the latch rod 61 to disengage the latch rod 61 from the latch hole 41, and the spring 62 is compressed. Then the worker pulls the wire baffle 4 upward to disengage the wire baffle 4 from the installation groove 5, and the disassembly work of the wire baffle 4 is completed; after the inspection or replacement is completed, the worker places the wire baffle 4 into the installation groove 5. During the process of placing the wire baffle 4, the wire baffle 4 pushes the latch rod 61 toward the direction away from the latch hole 41 through the guide slope 611, and the spring 62 is compressed. When the latch hole 41 moves to face the latch rod 61, the pressure on the spring 62 disappears, and the spring 62 pushes the latch rod 61 to insert into the latch hole 41, and the fixing work of the wire baffle 4 is completed.

[0047] Example 3

[0048] Reference Figure 6 The difference between this embodiment and embodiment 1 is that a heat dissipation component 8 is provided on the rotating shaft 1, and the heat dissipation component 8 is arranged at the end of the rotor core 3 away from the commutator 2. The heat dissipation component 8 includes a heat dissipation plate 81 fixedly sleeved on the outer surface of the rotating shaft 1, and a plurality of heat dissipation blades 82 are fixedly connected to the surface of the heat dissipation plate 81. The plurality of heat dissipation blades 82 are evenly distributed circumferentially on the outer surface of the rotating shaft 1. The heat dissipation plate 81 is provided with heat dissipation grooves 811 corresponding to the plurality of through-grooves 31 one by one, and the heat dissipation grooves 811 are connected to the corresponding through-grooves 31.

[0049] The implementation principle of Example 3 of the present application is: when the rotating shaft 1 rotates, it drives the heat dissipation plate 81 to rotate, and the heat dissipation plate 81 drives the heat dissipation blades 82 to rotate and generate airflow. The airflow flows from the heat dissipation hole to the through groove 31. When the airflow passes through quickly, it takes away the heat absorbed by the rotor core 3, thereby realizing air cooling of the rotor core 3, further improving the heat dissipation effect of the motor rotor, reducing the adverse effects of heat accumulation on the winding resistance and magnetic field, and further improving the stability of the motor during operation.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A motor rotor pressure balancing structure, comprising a rotating shaft (1), wherein the outer surface of the rotating shaft (1) is sleeved with a commutator (2) and a rotor core (3), characterized in that: The commutator (2) is provided with a plurality of starting hooks (21) and tail hooks (22) at equal intervals and evenly arranged on the outer peripheral side of the rotor core (3); the starting hooks (21) and the tail hooks (22) are arranged in a one-to-one correspondence; the starting hooks (21) and the corresponding tail hooks (22) are arranged relative to each other; and each group of the starting hooks (21) and the tail hooks (22) are connected by a voltage-equalizing line (23).

2. The motor rotor pressure balancing structure according to claim 1, characterized in that: A plurality of grooves (24) are evenly and equidistantly formed on the outer peripheral side of the commutator (2).

3. The motor rotor pressure balancing structure according to claim 1, characterized in that: A plurality of through slots (31) are evenly and equidistantly formed on the outer peripheral side of the rotor core (3).

4. The motor rotor pressure balancing structure according to claim 3, characterized in that: A plurality of wire blocking plates (4) are evenly and equidistantly arranged on the outer peripheral side of the rotor core (3); the through slot (31) is arranged between two adjacent wire blocking plates (4); and the wire blocking plates (4) are in a "T"-shaped structure.

5. The motor rotor pressure balancing structure according to claim 4, characterized in that: The rotor core (3) is provided with mounting grooves (5) corresponding one-to-one to a plurality of the wire blocking plates (4); the wire blocking plates (4) are slidably connected in the corresponding mounting grooves (5); and connecting assemblies (6) corresponding one-to-one to the wire blocking plates (4) are provided at opposite ends of the rotor core (3); the wire blocking plates (4) are detachably connected to the rotor core (3) via the connecting assemblies (6).

6. The motor rotor pressure balancing structure according to claim 5, characterized in that: The rotor core (3) is provided with through holes (7) at both opposite ends. The connecting assembly (6) includes a latch rod (61) slidably connected to the through hole (7). The blocking plate (4) is provided with a latch hole (41) that is engaged with the latch rod (61). A spring (62) is sleeved on the outer surface of the latch rod (61). One end of the spring (62) is connected to the inner wall of the through hole (7) and the other end is connected to the latch rod (61). When the spring (62) is in a natural state, the latch rod (61) is engaged in the latch hole (41). The latch rod (61) is provided with a guide inclined surface (611) that is slidably engaged with the blocking plate (4).

7. The motor rotor pressure balancing structure according to claim 3, characterized in that: A heat dissipation assembly (8) is provided on the rotating shaft (1), and the heat dissipation assembly (8) comprises a heat dissipation plate (81) sleeved on the outer surface of the rotating shaft (1); a plurality of heat dissipation blades (82) are provided on the surface of the heat dissipation plate (81); the plurality of heat dissipation blades (82) are uniformly distributed circumferentially on the outer surface of the rotating shaft (1); the heat dissipation plate (81) is provided with heat dissipation grooves (811) corresponding to the plurality of through grooves (31) one by one; the heat dissipation grooves (811) are connected to the corresponding through grooves (31).

8. The motor rotor pressure balancing structure according to claim 1, characterized in that: The voltage-equalizing wire (23) is made of copper alloy, and the outer surface of the voltage-equalizing wire (23) is coated with an insulating layer.

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