Outer rotor structure of motor

Abstract

The outer rotor structure of the motor comprises a rotating shaft sleeved with a rotor end plate, a rotor iron core is arranged around the rotating shaft, and one end of the rotor iron core is fixedly connected with the side surface of the rotor end plate; a reinforcing steel coil is annularly arranged on the outer ring surface of the rotor iron core, and one end of the reinforcing steel coil extends and is annularly connected with the outer ring surface of the rotor end plate; a plurality of magnetic steels are annularly arranged on the inner ring surface of the rotor core; the shaft end of one side, facing the rotor iron core, of the rotating shaft is provided with a counterbore for embedding a magnetic sheet. A cavity formed by the rotor core and the rotating shaft is used for arranging the bearing and the stator core. The outer rotor frame for fixing the magnetic steel is formed by the rotor core, the rotor end plate and the reinforcing steel coil, the effect of reducing eddy current of the rotor core is utilized, the heating value of the outer rotor in the operation process of the motor is reduced, and the temperature rise state of the motor achieves the optimal effect. The structure is simple and compact, the occupied space of the structure is small, the magnetic sheet can be installed at the shaft end, feedback closed-loop control is achieved, and high practicability and wide applicability are achieved.

Description

Technical Field

[0001] The utility model relates to a rotor structure, in particular to an outer rotor assembly of an outer rotor servo motor, belonging to the technical field of motor equipment manufacturing. Background Art

[0002] At present, the outer rotor structure of the outer rotor servo motor occupies more axial space, and during the operation of the motor, the outer rotor generates relatively serious heat.

[0003] Therefore, it is necessary to provide a new outer rotor structure with small space occupation, high integration degree, and significantly reduced heat generation. Summary of the Invention

[0004] To solve the deficiencies of the prior art, the purpose of the utility model is to provide an outer rotor structure of a motor.

[0005] To achieve the above objectives, the utility model adopts the following technical solutions:

[0006] An outer rotor structure of a motor includes a rotating shaft sleeved with a rotor end plate, and a rotor core is arranged around the rotating shaft and is fixedly connected to the side surface of the rotor end plate at one end;

[0007] A reinforcing steel coil is annularly arranged on the outer ring surface of the rotor core, and one end of the reinforcing steel coil extends and annularly connects to the outer ring surface of the rotor end plate;

[0008] A plurality of magnetic steel is annularly arranged on the inner ring surface of the rotor core;

[0009] A counterbore is arranged at the shaft end on the side of the rotating shaft facing the rotor core, and a magnetic sheet is embedded in the counterbore;

[0010] The cavity formed by the rotor core and the rotating shaft is used to arrange bearings and a stator core.

[0011] The above rotor end plate and the rotating shaft are integrally provided.

[0012] The above rotating shaft is fixedly connected to the rotor end plate through a flange, and the flange is placed in the cavity of the rotor core.

[0013] An annular groove is arranged on the other side surface of the above rotor end plate, and the annular groove is used to place balance mud.

[0014] A plurality of protrusions are arranged on the inner ring surface of the above rotor core, and magnetic steel grooves are formed between adjacent protrusions for arranging magnetic steel.

[0015] There is a spacing between the end of the above magnetic steel and the end of the rotor core, and the spacing is used to place balance mud.

[0016] The other end of the above reinforcing steel coil extends and is flanged, and fits with the axial end surface of the rotor core.

[0017] A space is formed between the rotating shaft and the rotor core, which can accommodate double-row bearings, and the shaft section is located inside the rotor core.

[0018] The above-mentioned rotor core is formed by laminating silicon steel sheets.

[0019] The above-mentioned rotor end plate and the rotor core are fitted through a spigot.

[0020] The beneficial effects of the present utility model are as follows:

[0021] An outer rotor structure of a motor according to the present utility model utilizes a rotor core, a rotor end plate, and a reinforcing steel coil to form an outer rotor frame for fixing permanent magnets. By using the rotor core, eddy current losses are reduced, the heat generated by the outer rotor during the operation of the motor is decreased, and the temperature rise state of the motor reaches the best effect. Its structure is simple and compact, occupying less space, having a large output torque, good dynamic balance processability, making full use of space, improving the magnetic performance of the motor, and capable of providing a magnetic sheet installed at the shaft end to achieve feedback closed-loop control, with high reliability, strong practicability, and wide applicability. Description of the Drawings

[0022] Figure 1 Fig. is a structural schematic diagram of the outer rotor structure.

[0023] Figure 2 Fig. is a sectional view of the structural schematic diagram of the outer rotor structure.

[0024] Figure 3 Fig. is an exploded view of the structural schematic diagram of the outer rotor structure.

[0025] The meanings of the marks in the drawings are as follows: 1, rotating shaft; 2, rotor end plate; 3, connecting screw; 4, rotor core; 5, permanent magnet; 6, reinforcing steel coil; 7, magnetic sheet. Detailed Embodiments

[0026] The following specifically introduces the present utility model in conjunction with the drawings and specific embodiments.

[0027] An outer rotor structure of a motor is composed of a rotating shaft 1, a rotor end plate 2, a rotor core 4, a permanent magnet 5, a reinforcing steel coil 6, and a magnetic sheet 7.

[0028] The middle part of the rotating shaft is sleeved with a rotor end plate, and the rotor end plate is integrally provided with the rotating shaft or connected to the rotor end plate through a flange, that is, the rotor end plate is fixedly connected to the flange through a screw 3, and there are screw holes for connection on the rotor end plate.

[0029] An annular groove is provided on the outer side surface of the rotor end plate for fixing balance clay.

[0030] The inner side surface of the rotor end plate is fixedly connected to the annular rotor core. The rotor core is formed by laminating silicon steel sheets, arranged around the axis of rotation, and the end is fixedly connected to the inner side surface of the rotor end plate through a rabbet. There is a cavity between the rotor core and the shaft for arranging bearings and the stator core. When the rotor end plate and the shaft are fixedly connected by a flange, the flange is also arranged in the cavity between the rotor core and the shaft.

[0031] Preferably, the opposite surfaces of the rotor end plate and the rotor core are both provided with concave welding grooves, evenly distributed on the surface for laser welding. The position of the laser welding is exactly at the center of the welding groove, and the weld seam fixedly connects the rotor end plate and the rotor core. That is, through laser welding, the connection between the rotor end plate and the rotor core is ensured to be firm.

[0032] Several protrusions are spaced on the inner ring surface of the rotor core, and magnetic steel grooves are formed between adjacent protrusions for arranging magnetic steel. The protrusions play a role in separating the magnetic steel. Preferably, structural adhesive is used to fix between the magnetic steel and the rotor core.

[0033] There is a gap between the end of the magnetic steel and the end of the rotor core, and this gap is also used to place balancing clay.

[0034] The reinforcing steel coil is sleeved on the outer surfaces of the core and the rotor end plate from one side of the rotor core. And the reinforcing steel coil is provided with a flanging, and the flanging fits with the end of the rotor core. Preferably, structural adhesive is applied to the fitting surfaces of the reinforcing steel coil with the rotor core and the rotor end plate for strengthening.

[0035] A counterbore is provided at the end of the shaft, and the magnetic piece is placed in the counterbore and fixed with structural adhesive.

[0036] Working process:

[0037] The U / V / W three-phase electricity controlled by the driver forms an electromagnetic field inside and near the winding and the stator core. The rotor assembly rotates under the action of this magnetic field. At the same time, the magnetic piece and the encoder at the shaft end of the rotor assembly induce signals. The encoder feeds back the signals to the driver, and the driver compares the feedback value with the target value and adjusts the rotation angle of the rotor.

[0038] Eddy currents are generated inside the rotor core in the magnetic field space created by the stator core and the winding. In order to reduce the eddy current loss, the rotor core is laminated by silicon steel sheets, so that the eddy current passes through a smaller cross-section, increasing the resistance on the eddy current path, reducing the eddy current, and at the same time having small hysteresis loss and reducing the heating degree.

[0039] The reinforcing steel coil coats the outer surface of the rotor core through structural adhesive, so that the rigidity of the rotor core is improved within the original space condition limitations, and stable torque can also be provided under the rotor load state.

[0040] The basic principle, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the above embodiments do not limit the present utility model in any form. Any technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present utility model.

Claims

1. An outer rotor structure of a motor, characterized in that, It includes a rotating shaft sleeved with a rotor end plate. The rotor core is arranged around the rotating shaft and is fixedly connected to the side surface of the rotor end plate at one end. A reinforcing steel coil is annularly arranged on the outer ring surface of the rotor core, and one end of the reinforcing steel coil extends and annularly connects to the outer ring surface of the rotor end plate. A number of permanent magnets are annularly arranged on the inner ring surface of the rotor core. A counterbore is provided at the shaft end on the side of the rotating shaft facing the rotor core, and a magnetic sheet is embedded in the counterbore. The cavity formed by the rotor core and the rotating shaft is used to arrange bearings and a stator core.

2. The outer rotor structure according to claim 1, characterized in that, The rotor end plate and the rotating shaft are integrally provided.

3. The outer rotor structure according to claim 1, characterized in that, The rotating shaft is fixedly connected to the rotor end plate through a flange, and the flange is placed in the cavity of the rotor core.

4. The outer rotor structure according to claim 1, characterized in that, Another side surface of the rotor end plate is provided with an annular groove, and the annular groove is used to place balance mud.

5. The outer rotor structure according to claim 1, characterized in that, A number of protrusions are provided on the inner ring surface of the rotor core, and a permanent magnet groove is formed between adjacent protrusions for arranging permanent magnets.

6. The outer rotor structure according to claim 1, characterized in that There is a spacing between the end of the permanent magnet and the end of the rotor core, and the spacing is used to place balance mud.

7. The outer rotor structure according to claim 1, characterized in that, The other end of the reinforcing steel coil extends and is flanged, and fits with the axial end surface of the rotor core.

8. The outer rotor structure according to claim 1, wherein A space is formed between the rotating shaft and the rotor core, which can arrange double-row bearings, and this shaft section is located inside the rotor core.

9. The outer rotor structure according to claim 1, characterized in that, The rotor core is formed by laminating silicon steel sheets.

10. The outer rotor structure according to claim 1, characterized in that, The rotor end plate and the rotor core are fitted through a spigot.

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