Novel motor rotor structure

Abstract

The utility model discloses a novel motor rotor structure, which comprises a rotor body, and an encoder code disc matched with a stator of an inductance type encoder is fixedly arranged at a preset position of the rotor body. In the novel motor rotor structure provided by the utility model, because the encoder code disc and the rotor body are designed into an integrated structure, the size of a motor can be effectively reduced, and the novel motor rotor structure has relatively high mechanical strength and relatively good thermal stability; meanwhile, according to the integrated structure, the coded disc of the encoder and the rotating shaft of the motor can be directly arranged into a whole, so that the system precision is improved, and batch production and system debugging are facilitated; moreover, the integrated structure enables the phase relation between the coded disc of the encoder and the rotor of the motor to be clear and unified during product design, thereby reducing the subsequent debugging workload.

Description

TECHNICAL FIELD

[0001] The utility model relates to a motor structure, especially a rotor structure of a direct current torque motor. BACKGROUND

[0002] In order to realize the accurate control to the motor operation, the corresponding encoder is configured for the motor.

[0003] In the prior art, the inductive encoder is widely applied due to its high precision and other advantages. In actual operation, the rotor PCB board or the encoder disc of the inductive encoder needs to be installed on the rotating shaft through the shaft sleeve, and the air gap between the stator PCB board and the rotor PCB board or the encoder disc of the inductive encoder needs to be adjusted, which causes long adjustment time and affects the precision. Moreover, the axial movement of the rotating shaft will cause the air gap to change, and then the position harmonic will affect the absolute value position precision. In addition, the rotor PCB board or the encoder disc is installed on the rotating shaft in the form of an assembly, and the PCB material cannot withstand the huge centrifugal force generated by high speed, and cannot be applied to high speed scenes. SUMMARY

[0004] The utility model provides a novel motor rotor structure aiming at the defects of the prior art.

[0005] The novel motor rotor structure, comprising a rotor body, a predetermined position of the rotor body is fixedly provided with an encoder disc matched with a stator of an inductive encoder.

[0006] In the novel motor rotor structure, the encoder disc is arranged on the inner edge of the middle part of the rotor body and is integrally formed with the rotor body.

[0007] In the novel motor rotor structure, the encoder disc is arranged on the end part of the rotor body and is integrally formed with the rotor body.

[0008] In the novel motor rotor structure, the encoder disc is arranged on the end part of the rotor body and is fixedly integrated with the rotor body.

[0009] In the novel motor rotor structure, the encoder disc comprises a rotor plate in the form of a circular ring, a plurality of outer ring sensing sectors and a plurality of inner ring sensing sectors arranged on the rotor plate in the circumferential direction.

[0010] The novel motor rotor structure, since the encoder code disc and the rotor body are designed as an integrated structure, can effectively reduce the motor volume, and has higher mechanical strength and better thermal stability; meanwhile, the integrated structure can also be regarded as directly setting the encoder code disc and the rotating shaft of the motor as a whole, improves the system precision, is convenient for batch production and system debugging; and the integrated structure can also clearly unify the phase relation between the encoder code disc and the motor rotor in product design, reduces the subsequent debugging workload. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic view of the novel motor rotor structure of the utility model;

[0012] Figure 2 is Figure 1 a sectional view of the novel motor rotor structure shown in the figure;

[0013] Figure 3 is another schematic view of the novel motor rotor structure of the utility model;

[0014] Figure 4 is Figure 3 a sectional view of the novel motor rotor structure shown in the figure;

[0015] Figure 5 is still another schematic view of the novel motor rotor structure of the utility model;

[0016] Figure 6 is Figure 5 a sectional view of the novel motor rotor structure shown in the figure;

[0017] Figure 7 is still another schematic view of the novel motor rotor structure of the utility model;

[0018] Figure 8 is Figure 7 a sectional view of the novel motor rotor structure shown in the figure. DETAILED DESCRIPTION

[0019] The utility model will be further explained in detail in combination with the drawings, so that the person skilled in the art can implement according to the description.

[0020] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, the novel motor rotor structure, including rotor body 1, the rotor body 1 can be permanent magnet motor rotor, can also be induction motor rotor or DC motor winding rotor, the embodiment is taken permanent magnet motor rotor as example and is explained. Further, the utility model discloses still in the predetermined position fixed setting of rotor body 1 with the stator (not shown in drawing) of inductance type encoder matching encoder code disc 2. In actual operation, the encoder code disc 2 can adopt the magnetic conductive metal (same material with rotor body 1) or non-magnetic metal (such as stainless steel, aluminum alloy, copper alloy, titanium alloy etc.) that is effectively inducted with the stator of inductance type encoder, and the specific material can be determined according to application scene and technical requirement.

[0021] In the utility model, since the encoder code disc 2 and rotor body 1 are designed as integrated structure, can effectively reduce motor volume, and have higher mechanical strength and better thermal stability, simultaneously, this integrated structure can also be considered as directly setting encoder code disc with motor's rotating shaft as a whole, improves system accuracy, is convenient for batch production and system debugging, and moreover, integrated structure can also make the phase relation of encoder code disc 2 and motor rotor clear and unified in product design, reduces subsequent debugging workload.

[0022] The novel motor rotor structure of the utility model, the encoder code disc 2 is fixedly arranged at the predetermined position of rotor body 1, for example Figure 1 、 Figure 2 As shown, the encoder code disc 2 is arranged at the inner edge of the middle part of the rotor body 1 and is integrally processed with the rotor body 1. That is, the rotor plate 20 of the encoder code disc 2 is made of the same magnetic conductive material as the rotor body 1 of the motor, and the plurality of outer ring induction sector rings 21 and the plurality of inner ring induction sector rings 22 distributed along the circumferential direction of the rotor plate 20 are made of non-magnetic conductive material.

[0023] Or, as shown in Figure 3 、 Figure 4 The encoder code disc 2 is arranged at the end of the rotor body 1 and is integrally formed with the rotor body 1. That is, the rotor plate 20 of the encoder code disc 2 is made of the same magnetic conductive material as the rotor body 1 of the motor, and the plurality of outer ring induction sector rings 21 and the plurality of inner ring induction sector rings 22 distributed along the circumferential direction of the rotor plate 20 are made of non-magnetic conductive material.

[0024] Or, as shown in Figure 5 、 Figure 6 , and Figure 7 、 Figure 8As shown, the encoder disc 2 is arranged at the end of the rotor body 1 and fixed integrally with the rotor body 1. At this time, the encoder disc 2 specifically comprises a rotor plate 20 in the shape of a circular ring and a plurality of outer ring induction sector rings 21 and a plurality of inner ring induction sector rings 22 arranged on the rotor plate 20 in the circumferential direction. In this structure, the rotor plate 20 of the encoder disc 2 can be made of a metal material different from the rotor body 1.

[0025] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and can be applied to various fields suitable for the present application, and other modifications can be easily implemented by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein.

Claims

1. A novel electric machine rotor structure comprising a rotor body, characterized by, The inner edge of the middle part of the rotor body or the end part of the rotor body is provided with an encoder disc matched with a stator of an inductive encoder; The encoder disc comprises a rotor plate in the shape of a circular ring and a plurality of outer ring sensing sectors and a plurality of inner ring sensing sectors distributed on the rotor plate in the circumferential direction, and the rotor plate is integrally formed with the rotor body.

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