Rotor winding structure

Abstract

The utility model discloses a rotor winding structure. Belongs to the technical field of micromotor rotors. The technical key points are that the motor comprises a commutator and a rotor iron core which are fixed on a rotating shaft, a plurality of rotor iron core grooves are uniformly distributed on the rotor iron core along the circumferential direction at intervals, a plurality of copper coil groups are wound between the rotor iron core grooves and a commutator hook part, and each copper coil group is composed of a first coil group and a second coil group. The number of turns of the first coil assembly is different from that of the second coil assembly; the utility model aims to provide a rotor winding structure which is compact in structure, capable of reducing manufacturing cost and good in effect. The utility model is used for micromotor rotors.

Description

Technical Field

[0001] The utility model relates to a micro-motor rotor winding structure, and more specifically, particularly to a rotor winding structure. Background Art

[0002] The existing methods for suppressing electromagnetic interference of single-phase series-excited and permanent magnet DC motors are all achieved by adding capacitors, inductors, magnetic rings to external circuits, or adjusting the rotor commutation angle, or adjusting the stator-rotor turns ratio (series-excited), or changing the carbon brush material. These methods can basically solve the electromagnetic interference (EMC) problem, but the suppression cost is relatively high. At the same time, some motors cannot pass the EMC test or are unable to be accepted by the market due to the high suppression cost, so they are forced to terminate the research and development stage and cannot be put on the market for sale. Utility Model Content

[0003] The purpose of the utility model is to provide a rotor winding structure with a compact structure, reduced manufacturing cost and good effect in view of the above-mentioned deficiencies in the prior art.

[0004] The technical solution of the utility model is implemented as follows: a rotor winding structure, including a commutator and a rotor core fixed on a rotating shaft, a plurality of rotor core slots are evenly distributed along the circumferential direction on the rotor core, a plurality of copper coil groups are wound between the rotor core slots and the commutator hooks, the copper coil groups are composed of a first coil group and a second coil group, and the number of turns of the first coil group and the second coil group are different.

[0005] In the above-mentioned rotor winding structure, the ratio of the number of turns of the first coil group and the second coil group is 1:1.2-5.

[0006] In the above-mentioned rotor winding structure, the ratio of the number of turns of the first coil group to the number of turns of the second coil group is 1:1.2-3.5.

[0007] In the above-mentioned rotor winding structure, the number of the commutator hooks is at least twice the number of the rotor core slots.

[0008] After the utility model adopts the above scheme, two sub-windings with different turn ratios are wound on the same main winding of the rotor, which reduces the generation of electromagnetic interference sources (higher harmonics) of the motor and suppresses electromagnetic interference from the source. It has the advantages of simple process, good effect, and no material cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be further described in detail below in conjunction with the embodiments in the accompanying drawings, but this does not constitute any limitation to the present invention.

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] Figure 2 This is a simplified expansion diagram of the lap-wound rotor winding of the utility model;

[0012] Figure 3 A schematic diagram of a circuit for conducting an electromagnetic interference (EMC) test on a motor having a rotor produced in a conventional manner;

[0013] Figure 4 A schematic diagram of a circuit for performing electromagnetic interference (EMC) testing on a motor of the same type whose rotor is produced in the manner of the utility model;

[0014] Figure 5 This is a graph of the continuous interference voltage waveform of the motor on the L power line and a numerical graph of the test at some frequency points with large interference when the test frequency is 0.15-30MHz in Experiment 1 of the utility model;

[0015] Figure 6 This is a graph of the continuous interference voltage waveform of the N power line motor and a numerical graph of the test at some frequency points with large interference when the test frequency is 0.15-30MHz in Experiment 1 of the utility model;

[0016] Figure 7 This is the waveform diagram of the motor interference power and the numerical diagram of the test at some frequency points with large interference when the test frequency is 30-300MHz in Experiment 1 of the utility model;

[0017] Figure 8 This is the continuous interference voltage waveform diagram of the motor on the L power line and the test value diagram of some frequency points with large interference when the test frequency is 0.15-30MHz in Experiment 2 of the utility model;

[0018] Fig. 9 This is the waveform diagram of the continuous interference voltage of the N power line motor and the numerical diagram of the test at some frequency points with large interference when the test frequency is 0.15-30MHz in Experiment 2 of the utility model;

[0019] Fig.10 This is the waveform diagram of the motor interference power and the numerical diagram of the test at some frequency points with large interference when the test frequency is 30-300MHz in Experiment 2 of the utility model;

[0020] Fig.11 This is the continuous interference voltage waveform diagram of the motor on the L power line and the test value diagram of some frequency points with large interference when the test frequency is 0.15-30MHz in Experiment 3 of the utility model;

[0021] Fig.12 This is the waveform diagram of the continuous interference voltage of the N power line motor and the numerical diagram of the test at some frequency points with large interference when the test frequency is 0.15-30MHz in Experiment 3 of the utility model;

[0022] Fig.13 This is a test motor interference power waveform diagram and a test numerical diagram of some frequency points with greater interference when the test frequency is 30-300MHz in Experiment 3 of the present invention.

[0023] In the figure: 1, commutator; 2, rotor core; 3, rotor core slot; 4, copper coil group; 5, first coil group; 6, second coil group. DETAILED DESCRIPTION

[0024] See also Figure 1 As shown, a rotor winding structure of the utility model comprises a commutator 1 and a rotor core 2 fixed on a rotating shaft, a plurality of rotor core slots 3 are evenly distributed along the circumferential direction on the rotor core 2, a plurality of copper coil groups 4 are wound between the rotor core slots 3 and the hook portion of the commutator 1, the copper coil group 4 is composed of a first coil group 5 and a second coil group 6, and the first coil group 5 and the second coil group 6 have different numbers of turns.

[0025] Preferably, the ratio of the number of turns of the first coil group 5 and the second coil group 6 is 1:1.2-5. A further preferred ratio is 1:1.2-3.5. The ratio of the number of turns does not limit the first coil group to be more or less than the second coil group. The ratio of the two can be 1:1.2-5 or 1.2-5:1. As long as the number of turns of the two coil groups is different.

[0026] At the same time, in this embodiment, the number of the commutator 1 hooks is at least twice the number of the rotor core slots 3. Compared with the prior art, each copper coil group needs to occupy one more commutator hook when winding, so the number of commutator hooks must be at least twice the number of rotor core slots. Therefore, based on the concept of the utility model, it is also possible to divide the copper coil group into more than two coil groups with different numbers of turns. This is an equivalent alternative that can be easily thought of by those skilled in the art.

[0027] See also Figure 2 As shown, the utility model provides a method for winding the rotor winding as described above, the method comprising the following steps:

[0028] (1) Each group of copper coils wound in two matching rotor core slots is divided into a first coil group and a second coil group, wherein the first coil group and the second coil group have different numbers of turns;

[0029] (2) Winding the first copper coil group, hanging the winding head of the first coil group of the copper coil group on the first commutator hook, and then winding the first coil group in two matching rotor core slots. After winding the corresponding number of turns, the tail wire is hung on the second commutator hook adjacent to the first commutator hook, and then the second coil group is wound in the two rotor core slots where the first coil group is located. After winding the corresponding number of turns, the winding of the first copper coil group is completed;

[0030] (3) The copper winding wire is sequentially hung on the third commutator hook adjacent to the second commutator hook to form a winding head, which is also the tail wire of the second coil group. Repeat step (2) to complete the winding of each copper coil group in sequence; the copper winding wire is sequentially hung on the commutator hook.

[0031] Preferably, the ratio of the number of turns of the first coil group to the second coil group is 1:1.2-5. A further preferred ratio is 1:1.2-3.5. At the same time, the number of commutator hooks is at least twice the number of rotor core slots.

[0032] Experimental example

[0033] The following uses the HC5520H 220-240V 50Hz motor as an example to illustrate how the new design method can be used to produce motors, which can save costs and reduce EMC electromagnetic interference.

[0034] The stator parameters of the motor are φ0.23×350 turns×2, and the rotor parameters are φ0.15×72 turns×2. Assume that the first coil group 5 is A1 and the second coil group 6 is A2, that is, A1=A2=72 turns A=144 turns.

[0035] Experiment 1: Press Figure 3 The circuit diagram shown in the figure is installed on the upper stirrer HB01 housing for EMC testing. The test results are shown in Tables 1 to 3 and Figures 5 to 7 .

[0036]

[0037]

[0038] Table 1

[0039]

[0040] Table 2

[0041]

[0042] Table 3

[0043] Experiment 2: Press the motor Figure 4 Circuit diagram Install the upper stirrer HB01 housing for EMC test. The test results are shown in Tables 4 to 6 and Figures 8 to 10 .

[0044]

[0045] Table 4

[0046]

[0047] Table 5

[0048]

[0049] Table 6

[0050] Experiment 3: Modify the rotor winding according to the new design scheme to φ0.15×(90 turns + 54 turns), that is, A1=90 turns, A2=54 turns, A=144 turns, and the other parameters remain unchanged. Figure 4 Circuit diagram Install the upper stirrer HB01 housing for EMC test. The test results are shown in Tables 7 to 9 and Figures 11 to 13 .

[0051]

[0052] Table 7

[0053]

[0054]

[0055] Table 8

[0056]

[0057] Table 9

[0058] from Figures 5 to 7 It can be seen that the motor EMC conduction margin is 12.94dB and the radiated power margin is 3.9dB, so it can pass the EMC certification test.

[0059] from Figures 8 to 10 It can be seen that the motor's electromagnetic interference (EMC) conduction margin is 9.32dB and the radiated power exceeds 8.1dB, and it cannot pass the EMC certification test.

[0060] from Figures 11 to 13 It can be seen that the motor electromagnetic interference (EMC) conduction margin is 15.24dB and the radiated power margin is 15.35dB, so it can pass the electromagnetic interference (EMC) certification test.

[0061] In summary, from the attached figures and report, it can be concluded that the cost of the suppression components used and the electromagnetic interference (EMC) margin can show that the rotor motor designed according to the new design scheme can save 90uH toroidal inductor and reduce the capacitance of 0.22uF to 0.1Uf (about 1.3 yuan in total cost is saved); the EMC conduction margin increases by 2.3dB, and the radiation margin increases by 11.45dB.

[0062] The above embodiments are preferred implementation modes of the present invention and are only used to facilitate the explanation of the present invention. They are not intended to limit the present invention in any form. Any person with ordinary knowledge in the relevant technical field, if they do not depart from the scope of the technical features of the present invention, can make equivalent embodiments by partial changes or modifications to the technical contents disclosed in the present invention, and they still fall within the scope of the technical features of the present invention without departing from the technical features of the present invention.

Claims

1. A rotor winding structure, comprising a commutator (1) and a rotor core (2) fixed on a rotating shaft, a plurality of rotor core slots (3) uniformly spaced along the circumferential direction on the rotor core (2), a plurality of copper coil groups (4) wound between the rotor core slots (3) and the hook portion of the commutator (1), characterized in that: The copper coil group (4) consists of a first coil group (5) and a second coil group (6); the first coil group (5) and the second coil group (6) have different numbers of turns.

2. A rotor winding structure according to claim 1, characterized in that: The ratio of the number of turns of the first coil group (5) to the number of turns of the second coil group (6) is 1:1.2-5.

3. A rotor winding structure according to claim 2, characterized in that: The ratio of the number of turns of the first coil group (5) to the number of turns of the second coil group (6) is 1:1.2-3.

5.

4. A rotor winding structure according to claim 1, characterized in that: The number of hooks of the commutator (1) is at least twice the number of rotor core slots (3).

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