A dd motor drive apparatus

Abstract

A DD motor drive device is characterized by comprising a motor housing, a stator winding, an outer ring seat, an annular permanent magnet, and a rotating shaft. The stator winding is installed inside the motor housing. The outer ring seat is installed on the first end face of the motor housing, and the inner sidewall of the outer ring seat has an outer ring raceway. The annular permanent magnet is installed on the rotating shaft and faces the stator winding. The outer sidewall of the rotating shaft has an annular inner ring continuously arranged along its circumference, and the outer sidewall of the annular inner ring has an inner ring raceway. The inner ring raceway and the outer ring raceway are arranged opposite each other to form a roller channel, and multiple rollers are arranged in the roller channel. The outer end face of the rotating shaft has a first threaded hole. Compared with the prior art, the motor drive device of this utility model directly fixes the bearing outer ring to the motor housing, integrating the traditional bearing inner ring, turntable, and rotating shaft into a single structure, making the overall structure more compact and improving the machining accuracy in processing scenarios.

Description

Technical Field

[0001] This utility model belongs to the field of DD motor technology, and specifically relates to a DD motor drive device. Background Technology

[0002] As disclosed in CN112658783A, the rotary DD motor drive system includes a DD motor, a bearing assembly, and a turntable. These three components are separate structures, which not only results in a large axial length and a bulky structure for the entire drive system, but also leads to an increase in machining errors due to the accumulation of assembly errors between the DD motor and the bearing assembly, between the various parts of the bearing assembly, and between the DD motor and the turntable, ultimately reducing machining accuracy. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a DD motor drive device.

[0004] To achieve the above objectives, this utility model discloses a DD motor drive device, including a motor housing, stator windings, an outer ring base, an annular permanent magnet, and a rotating shaft;

[0005] The stator windings are installed inside the motor housing;

[0006] The outer ring seat is mounted on the first end face of the motor housing, and the inner side wall of the outer ring seat is provided with an outer ring raceway;

[0007] The annular permanent magnet is mounted on the rotating shaft and is opposite to the stator winding. The outer side wall of the rotating shaft is provided with an annular inner ring that is continuously arranged along its circumference. The outer side wall of the annular inner ring is provided with an inner ring raceway. The inner ring raceway and the outer ring raceway are arranged opposite to each other to form a roller channel. Multiple rollers are provided in the roller channel. The outer end face of the rotating shaft is provided with a first threaded hole.

[0008] Furthermore, the first end face of the motor housing is provided with a plurality of second threaded holes, and the outer ring seat is provided with a plurality of through holes, the plurality of through holes being provided in a one-to-one correspondence with the plurality of second threaded holes, and the outer ring seat being connected to the motor housing by screws.

[0009] Furthermore, a first annular groove is formed on the inner side of the first end face of the motor housing, and a second threaded hole is provided at the bottom of the first annular groove;

[0010] The outer ring seat includes an integrally formed outer ring body and an annular connecting ear. The inner sidewall of the outer ring body is provided with the outer ring raceway. The annular connecting ear is engaged in the first annular groove and is provided with the through hole.

[0011] Furthermore, the first end face of the motor housing is flush with the end face of the outer ring seat.

[0012] Furthermore, the outer end face of the rotating shaft protrudes beyond the end face of the outer ring seat.

[0013] Furthermore, it also includes an adapter, which is installed on the inner end face of the rotating shaft. An encoder is installed inside the motor housing, and the rotor of the encoder is connected to the adapter.

[0014] Furthermore, the adapter is annular in shape, and a groove is provided on the top surface of the adapter. The groove is fitted onto the end of the rotating shaft, and the inner sidewall of the groove abuts against the outer sidewall of the rotating shaft.

[0015] Furthermore, the bottom surface of the adapter is provided with a third threaded hole, which is used to install the rotor of the encoder.

[0016] Furthermore, the rotating shaft is a central control shaft, and the inner cavity of the rotating shaft extends through both ends of the rotating shaft.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] The outer ring housing is the outer ring of the bearing, and it is mounted on the end face of the motor housing. The outer wall of the shaft has a continuously arranged annular inner ring, which serves as the inner ring of the bearing. The raceway of the outer ring housing and the raceway of the inner ring form a roller channel. Rollers are installed within this channel to form a bearing that supports the shaft pair. Simultaneously, the rollers limit the axial and radial movement of the shaft. A first threaded hole is provided on the outer end face of the shaft, serving as a mounting reference surface, and the first threaded hole acts as a connection structure for connecting the load.

[0019] The above design directly fixes the outer ring of the bearing to the motor housing, integrating the traditional inner ring, turntable, and shaft into a single structure. This eliminates the need for bearing housings and other components, resulting in a smaller axial dimension for the motor drive unit compared to traditional models. The integrated structure of the bearing inner ring, turntable, and shaft eliminates the assembly errors associated with separate components, thus avoiding the large machining errors and low precision problems caused by separate designs. This improves machining accuracy, enhances shaft rigidity, and increases the shaft's resistance to deformation under external forces.

[0020] The inner and outer rings of existing bearings are made of bearing steel. In this invention, the inner ring of the bearing is an integral structure with the shaft, and its material should also be bearing steel. This further improves the strength and rigidity of the shaft and extends its service life. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the DD motor drive device in the embodiment;

[0022] Figure 2for Figure 1 A cross-sectional view of a DD motor drive unit;

[0023] Figure 3 for Figure 1 A three-dimensional structural diagram of the motor housing;

[0024] Figure 4 for Figure 1 Front view of the inner and outer ring bases and the rotating shaft;

[0025] Figure 5 for Figure 4 A sectional view;

[0026] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle;

[0027] Figure 7 This is a three-dimensional structural diagram of the two adapter components;

[0028] Motor housing 100; first end face 110; second threaded hole 111; first annular groove 112; stator winding 120;

[0029] Outer ring seat 200; outer ring body 210; outer ring raceway 211; annular connecting lug 220; through hole 221;

[0030] 300 ring-shaped permanent magnet;

[0031] Shaft 400; inner ring 410; inner ring raceway 411; first threaded hole 420;

[0032] Roller channel 500;

[0033] Adapter 600; Slot 610; Third threaded hole 620;

[0034] Encoder 700. Detailed Implementation

[0035] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] A DD motor drive device, see Figures 1-7 It includes a motor housing 100, a stator winding 120, an outer ring seat 200, a ring permanent magnet 300, and a rotating shaft 400.

[0037] The stator winding 120 is fixed inside the motor housing 100. The outer ring seat 200 is mounted on the first end face 110 of the motor housing 100 (the end face away from the motor housing 100). The inner sidewall of the outer ring seat 200 is provided with an outer ring raceway 211. The annular permanent magnet 300 is mounted on the rotating shaft 400 by adhesive bonding and is opposite to the stator winding 120. The outer sidewall of the rotating shaft 400 is provided with an annular inner ring 410 continuously arranged circumferentially. The outer sidewall of the annular inner ring 410 is provided with an inner ring raceway 411. The inner ring raceway 411 and the outer ring raceway 211 are arranged opposite to each other to form a roller channel 500. Multiple rollers are arranged in the roller channel 500, ultimately forming a crossed roller bearing. The outer end face of the rotating shaft 400 is provided with a first threaded hole 420.

[0038] In the above-described DD motor drive device, the outer raceway 211 of the outer ring seat 200 and the inner raceway 411 of the annular inner ring 410 form a roller channel 500. Rollers are arranged within the roller channel 500 to form a crossed roller bearing. The rollers within the roller channel 500 support the rotating shaft 400, and the axial and radial movement of the rotating shaft 400 is limited by the cooperation between the rollers and the inner raceway 411. A first threaded hole 420 is provided on the outer end face of the rotating shaft 400. The outer end face of the rotating shaft 400 serves as a mounting reference surface, and the first threaded hole 420 serves as a connection structure for connecting a load.

[0039] Because the outer ring of the bearing is directly fixed to the motor housing 100, the traditional inner ring of the bearing, the turntable, and the shaft 400 are integrated into a single structure, eliminating the need for components such as bearing seats. This results in a smaller axial dimension of the motor drive device compared to traditional motor drive devices. The integrated structure of the inner ring, turntable, and shaft 400 eliminates the assembly errors associated with separate components, thus avoiding the problems of large machining errors and low machining accuracy caused by separate structures. This improves machining accuracy and enhances the rigidity of the shaft 400, increasing its resistance to deformation under external forces. While existing bearings use bearing steel for both the inner and outer rings, the inner ring of the bearing in this embodiment, being an integral structure with the shaft 400, should also be made of bearing steel. This further improves the strength and rigidity of the shaft 400, extending its service life.

[0040] In this embodiment, the first end face 110 of the motor housing 100 is provided with a plurality of second threaded holes 111, and the outer ring seat 200 is provided with a plurality of through holes 221. The plurality of through holes 221 are provided in a one-to-one correspondence with the plurality of second threaded holes 111. The outer ring seat 200 is connected to the motor housing 100 by screws.

[0041] Furthermore, a first annular groove 112 is formed by a recess on the inner side of the first end face 110 of the motor housing 100, and the bottom of the first annular groove 112 is provided with the aforementioned second threaded hole 111. The outer ring seat 200 includes an integrally formed outer ring body 210 and an annular connecting ear 220. The inner sidewall of the outer ring body 210 is provided with the aforementioned outer ring raceway 211, and the annular connecting ear 220 is engaged in the first annular groove 112. The annular connecting ear 220 is provided with a through hole 221. The engagement of the first annular groove 112 with the annular connecting ear 220 ensures that the annular connecting ear 220 is stably engaged in the first annular groove 112, thereby improving the assembly stability of the outer ring seat 200.

[0042] The first end face 110 of the motor housing 100 is flush with the end face of the outer ring seat 200, and the end face of the motor drive device is also flush, resulting in a better appearance.

[0043] In this embodiment, the outer end face of the rotating shaft 400 protrudes from the end face of the outer ring seat 200. When the load is connected to the outer end face of the rotating shaft 400, there is a certain space between the outer end face of the rotating shaft 400 and the outer ring seat 200, which can greatly avoid interference between the load and the outer ring seat 200.

[0044] In this embodiment, the rotating shaft 400 is a central control shaft, and the inner cavity of the rotating shaft 400 extends through both ends of the rotating shaft 400, which can reduce the weight of the rotating shaft 400 and save materials.

[0045] An encoder 700 is installed inside the motor housing 100. The encoder stator is fixed inside the motor housing 100, and the encoder rotor is mounted on the shaft 400. Because the shaft 400 is made of bearing steel, and the screws used for the encoder rotor are relatively small, machining a fourth screw hole on the shaft 400 is difficult. Furthermore, if the fourth screw hole is close to the inner wall of the shaft 400, it is prone to damage during machining. In this embodiment, the motor drive device also includes an adapter 600. The adapter 600 can be made of aluminum alloy, etc., and the inner end face of the shaft 400 has a fourth threaded hole. The size and position of the fourth screw hole can be set as needed, making it relatively easy to machine. The adapter 600 is fixed to the shaft 400 with screws. The encoder stator is installed inside the motor housing 100, and the encoder rotor is connected to the adapter 600 with screws. Because the adapter 600 is made of aluminum alloy, it is easier to machine than bearing steel.

[0046] The adapter 600 is annular in shape, and the top surface of the adapter 600 is provided with a groove 610. The groove 610 is sleeved on the end of the rotating shaft 400, and the inner side wall of the groove 610 abuts against the outer side wall of the rotating shaft 400. This can improve the assembly accuracy, stability and reliability of the adapter 600 and the rotating shaft 400.

[0047] The bottom surface of the adapter 600 is provided with a third threaded hole 620, which is used to install the rotor of the encoder.

[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A DD motor drive device, characterized in that: Includes the motor housing, stator windings, outer ring mount, toroidal permanent magnet, and shaft; The stator windings are installed inside the motor housing; The outer ring seat is mounted on the first end face of the motor housing, and the inner side wall of the outer ring seat is provided with an outer ring raceway; The annular permanent magnet is mounted on the rotating shaft and is opposite to the stator winding. The outer side wall of the rotating shaft is provided with an annular inner ring that is continuously arranged along its circumference. The outer side wall of the annular inner ring is provided with an inner ring raceway. The inner ring raceway and the outer ring raceway are arranged opposite to each other to form a roller channel. Multiple rollers are provided in the roller channel. The outer end face of the rotating shaft is provided with a first threaded hole.

2. The DD motor drive device according to claim 1, characterized in that: The first end face of the motor housing is provided with a plurality of second threaded holes, and the outer ring seat is provided with a plurality of through holes. The plurality of through holes are provided in a one-to-one correspondence with the plurality of second threaded holes, and the outer ring seat is connected to the motor housing by screws.

3. The DD motor drive device according to claim 2, characterized in that: The inner side of the first end face of the motor housing is recessed to form a first annular groove, and the bottom of the first annular groove is provided with a second threaded hole; The outer ring seat includes an integrally formed outer ring body and an annular connecting ear. The inner sidewall of the outer ring body is provided with the outer ring raceway. The annular connecting ear is engaged in the first annular groove and is provided with the through hole.

4. The DD motor drive device according to claim 3, characterized in that: The first end face of the motor housing is flush with the end face of the outer ring seat.

5. The DD motor drive device according to claim 1, characterized in that: The outer end face of the rotating shaft protrudes from the end face of the outer ring seat.

6. The DD motor drive device according to claim 1, characterized in that: It also includes an adapter, which is installed on the inner end face of the rotating shaft. An encoder is installed inside the motor housing, and the rotor of the encoder is connected to the adapter.

7. The DD motor drive device according to claim 6, characterized in that: The adapter is annular in shape, and a slot is provided on the top surface of the adapter. The slot is fitted onto the end of the rotating shaft, and the inner sidewall of the slot abuts against the outer sidewall of the rotating shaft.

8. The DD motor drive device according to claim 6, characterized in that: The bottom surface of the adapter is provided with a third threaded hole, which is used to install the rotor of the encoder.

9. The DD motor drive device according to claim 1, characterized in that: The rotating shaft is a central control shaft, and the inner cavity of the rotating shaft extends through both ends of the rotating shaft.

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