A rotor hook-slot structure for a DC motor

Abstract

This utility model provides a rotor hook-slot structure for a DC motor, including rotor hooks and rotor slots, both located on the outer circumference of the rotor and evenly arranged in a ring on the outer circumference. The rotor hooks are provided in numbers of 12, and the rotor slots are provided in numbers of 18. A wire group extends outward from the rotor hooks and winds around the rotor slots. This rotor hook-slot structure for a DC motor, by increasing the number of rotor slots to 18 (no longer corresponding to a single slot), reduces the current density in a single slot, thereby reducing the impact of armature current on the main magnetic field, helping to reduce magnetic field inhomogeneity, thus reducing sparks during electrolysis and improving commutation performance.

Description

Technical Field

[0001] This utility model relates to a rotor hook-slot structure for a DC motor. Background Technology

[0002] Currently, brushless DC motors are widely used in the market due to their stability and ability to operate with high power at low torque. However, since the winding combination between the rotor and stator directly affects the efficiency of the motor, the conventional hook-slot ratio is fixed, usually a 1:1 design. Although this design facilitates the processing and assembly of the rotor and stator, the armature reaction generated by the rotor causes the rotor magnetic field to superimpose with the stator's main pole magnetic field, resulting in magnetic field distortion. This also causes the geometric center line of the stator magnetic field to deviate from the physical center line, making the stator lag and the motor commutate ahead. This can easily generate sparks, seriously affecting the use and safety of the motor. Utility Model Content

[0003] This utility model aims to provide a rotor hook-slot structure for a DC motor. By redesigning the rotor hook-slots, the 1:1 ratio of the rotor and stator hook-slots is no longer pursued, but instead a 18:12 design is adopted, which effectively reduces the distortion of the main magnetic field and reduces motor pulsation.

[0004] To solve the above problems, the present invention provides a rotor hook-slot structure for a DC motor, which adopts the following technical solution:

[0005] A rotor hook-slot structure for a DC motor includes rotor hooks and rotor slots, both located on the outer circumference of the rotor and evenly arranged in a ring on the outer circumference of the rotor; wherein there are 12 rotor hooks and 18 rotor slots, and a wire group extends outward from the rotor hooks and winds around the rotor slots; the rotor slots are arranged in order from 1 to 18, with slot 1 and slot 18 being adjacent and distributed in a ring shape, and the wire group extends outward from slot 1 and winds around the rotor hooks.

[0006] Furthermore, the winding wires are arranged in multiple groups, which are led out in the order of slots 1, 18, and 17.

[0007] Furthermore, there are four groups of wires, starting from slots 1, 18, 17 and 16. The wires from slot 1 eventually return to slot 18, and so on. The wires from slot 18 eventually return to slot 17, and the wires from slot 17 eventually return to slot 16.

[0008] Furthermore, there are 12 rotor hooks arranged in a ring. The rotor hooks are arranged in order from 1 to 12, where hook number 1 corresponds to slot number 1 of the rotor slot, and its center is determined as the physical center line of the rotor. Hook number 1 and hook number 12 are adjacent to each other.

[0009] Furthermore, starting with slot 1, the line is first wound between hooks 7 and 8, then between hooks 1 and 2, and so on for other line groups.

[0010] Furthermore, the wire group is provided in four groups, with two adjacent wire groups wound between the same two rotor hooks.

[0011] Furthermore, the exit points of the four line groups are numbered S, A, C, and E, with exit point F adjacent to exit point E. Line groups S and A first wind around between hooks 7 and 8, then wind around between hooks 1 and 2. Line group S winds around to the exit point of line group A, and line group A continues to follow line group C, first winds around between hooks 5 and 6, then winds around between hooks 1 and 12. Line group A winds around to the exit point of line group C, and line group C continues to follow line group E, first winds around between hooks 4 and 5, then winds around between hooks 12 and 11. At this point, line group C winds around to the exit point of line group E, while line group E winds around to exit point F.

[0012] Furthermore, the side of the first slot of the rotor is 15 degrees away from the physical center line of the rotor.

[0013] The beneficial effects of this utility model are as follows: The rotor slot structure of the DC motor provided by this utility model, by changing the number of rotor slots to 18, no longer corresponding to the rotor slots, increases the number of rotor slots, which can reduce the current density in a single slot, thereby reducing the influence of armature projection on the main magnetic field, helping to reduce magnetic field non-uniformity, thereby reducing sparks during electrolysis, and improving commutation performance; secondly, it can improve the efficiency and power factor of the motor. The increased rotor slots lead to an increase in rotor resistance, which helps to increase starting torque during startup, and can reduce rotor losses during stable operation, thereby improving motor efficiency; finally, due to the increased number of rotor slots, the current in the rotor can be distributed more effectively, reducing torque pulsation during startup and improving the smoothness of motor operation. Attached Figure Description

[0014] Appendix Figure 1 This is a structural development diagram of the present invention.

[0015] Among them: 1. Rotor slots, 2. Rotor hooks, and wire assembly outlets: S, A, C, E, F

[0016] Connection points for the winding of the yarn group: B, D. Detailed Implementation

[0017] To better understand the technical solution provided by this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] As shown in the attached figure, the present invention provides a rotor hook and slot structure for a DC motor, including rotor hooks and rotor slots, both located on the outer circumference of the rotor and evenly arranged in a ring on the outer circumference of the rotor; wherein there are 12 rotor hooks and 18 rotor slots, and the wire group extends outward from the rotor hooks and winds around the rotor slots; the rotor slots are arranged in order from 1 to 18, wherein slot 1 and slot 18 are adjacent and are distributed in a ring shape, and the wire group extends outward from slot 1 and winds around the rotor hooks.

[0019] Furthermore, the winding wires are arranged in multiple groups, which are led out in the order of slots 1, 18, and 17.

[0020] Furthermore, there are four groups of wires, starting from slots 1, 18, 17 and 16. The wires from slot 1 eventually return to slot 18, and so on. The wires from slot 18 eventually return to slot 17, and the wires from slot 17 eventually return to slot 16.

[0021] Furthermore, there are 12 rotor hooks arranged in a ring. The rotor hooks are arranged in order from 1 to 12, where hook number 1 corresponds to slot number 1 of the rotor slot, and its center is determined as the physical center line of the rotor. Hook number 1 and hook number 12 are adjacent to each other.

[0022] Furthermore, starting with slot 1, the line is first wound between hooks 7 and 8, then between hooks 1 and 2, and so on for other line groups.

[0023] Furthermore, the wire group is provided in four groups, with two adjacent wire groups wound between the same two rotor hooks.

[0024] Furthermore, the exit points of the four line groups are numbered S, A, C, and E, with exit point F adjacent to exit point E. Line groups S and A first wind around between hooks 7 and 8, then wind around between hooks 1 and 2. Line group S winds around to the exit point of line group A, and line group A continues to follow line group C, first winds around between hooks 5 and 6, then winds around between hooks 1 and 12. Line group A winds around to the exit point of line group C, and line group C continues to follow line group E, first winds around between hooks 4 and 5, then winds around between hooks 12 and 11. At this point, line group C winds around to the exit point of line group E, while line group E winds around to exit point F.

[0025] Furthermore, the side of the first slot of the rotor is 15 degrees away from the physical center line of the rotor.

Claims

1. A rotor hook-slot structure for a DC motor, characterized in that, It includes rotor hooks and rotor slots, both located on the outer circumference of the rotor and evenly arranged in a ring on the outer circumference of the rotor; wherein there are 12 rotor hooks and 18 rotor slots, and the wire group extends outward from the rotor hooks and winds around the rotor slots; the rotor slots are arranged in order from 1 to 18, where slot 1 and slot 18 are adjacent and are distributed in a ring shape, and the wire group extends outward from slot 1 and winds around the rotor hooks.

2. The rotor hook-slot structure of a DC motor according to claim 1, characterized in that, The winding wires are arranged in multiple groups, and are drawn out in the order of slots 1, 18, and 17.

3. The rotor hook-slot structure of a DC motor according to claim 2, characterized in that, There are four groups of wires, starting from slots 1, 18, 17 and 16. The wires from slot 1 eventually return to slot 18, and so on. The wires from slot 18 eventually return to slot 17, and the wires from slot 17 eventually return to slot 16.

4. The rotor hook-slot structure of a DC motor according to claim 1, characterized in that, The rotor hooks are arranged in a ring with 12 hooks arranged in order from 1 to 12. Hook No. 1 corresponds to slot No. 1 of the rotor slot, and its center is determined as the physical center line of the rotor. Hook No. 1 and hook No. 12 are adjacent to each other.

5. The rotor hook-slot structure of a DC motor according to claim 4, characterized in that, The line group starts from slot 1, first winding it between hooks 7 and 8, then winding it between hooks 1 and 2, and so on for other line groups.

6. The rotor hook-slot structure of a DC motor according to claim 5, characterized in that, The wire group is configured with four groups, and two adjacent wire groups are wound between the same two rotor hooks.

7. The rotor hook-slot structure of a DC motor according to claim 6, characterized in that, The four line groups have exit points numbered S, A, C, and E, with exit point F adjacent to exit point E. Line groups S and A first wind around between hooks 7 and 8, then between hooks 1 and 2. Line group S winds around to the exit point of line group A, and line group A continues to follow line group C, first winding between hooks 5 and 6, then between hooks 1 and 12. Line group A winds around to the exit point of line group C, and line group C continues to follow line group E, first winding between hooks 4 and 5, then between hooks 12 and 11. At this point, line group C winds around to the exit point of line group E, while line group E winds around to exit point F.

8. The rotor hook-slot structure of a DC motor according to claim 1, characterized in that, The side of the first slot of the rotor is 15 degrees away from the physical center line of the rotor.

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