A rotor structure for an electric machine

Abstract

The application discloses a rotor structure of a motor and relates to the technical field of motors, which comprises a sun gear capable of being penetrated by a motor shaft in a motor shell and a fixing seat for fixing the rotor shell; the sun gear is connected with the fixing seat. In view of the technical problem of sun gear noise caused by poor rotation stability of the rotor shell, the transitional fixing seat for fixing the sun gear on the rotor shell is cancelled, the assembly precision is improved, and the sun gear operation noise is reduced; the rotor shell is designed in a split type, so that the cost is reduced and the efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a rotor structure of an electric machine. BACKGROUND

[0002] In the structure of the electric machine, the stator core is fixed on the stator core seat, the stator core seat is fixed on the electric machine shaft, and the rotor shell is fixed on the fixed seat. The rotor shell is matched on the electric machine shaft through the deep groove ball bearing. The fixed seat is provided with a sun gear. The fixed seat is fixed on the rotor shell through the fastening screw. The rotor shell is an integral structure, which has high cost and poor processability. The stator core is fixed on the stator core seat, and then the stator core seat is fixed on the electric machine shaft. The stator core seat occupies the matching length of the rotor shell on the electric machine shaft. When the rotor shell rotates, the swing and vibration are large, and the sun gear fixed on the rotor shell will produce running noise. The sun gear is fixed on the rotor shell through the fixed seat. The sun gear is fixed on the rotor shell through the transition, the assembly precision is reduced, and the noise is increased. SUMMARY

[0003] 1. TECHNICAL PROBLEM

[0004] In view of the technical problem of the sun gear noise caused by the poor stability of the rotor shell in rotation, the present application provides a rotor structure of an electric machine, which cancels the transition fixed seat of the sun gear fixed on the rotor shell, improves the assembly precision, and reduces the running noise of the sun gear. The rotor shell is designed in a split body, which reduces the cost and increases the efficiency.

[0005] 2. TECHNICAL SCHEME

[0006] To solve the above problems, the technical scheme provided by the present application is as follows:

[0007] A rotor structure of an electric machine, comprising a sun gear located in a shell and capable of being penetrated by an electric machine shaft, and a fixed seat for fixing the rotor shell; the sun gear is connected with the fixed seat.

[0008] The sun gear is directly mounted on the fixed seat, the bearing chamber of the fixed seat is matched with the sun gear, and the parts are processed once clamped, so that the precision is high. The transition fixed seat of the sun gear to the rotor shell is removed, and the cost of the electric machine is reduced. The sun gear is directly mounted on the fixed seat, the precision of the parts is high, and the noise is low during operation. The rotor shell is processed by stamping, which has low cost.

[0009] Optionally, the hub cover one, the first end cover, the rotor shell, the fixed seat, the sun gear, the inner ring gear, the second end cover and the hub cover two are sequentially arranged in the shell from one end of the shell.

[0010] Optionally, the first end cover is connected with the hub cover on one side, the first end cover is fixedly connected with one end of the motor shaft, an extension on the other side of the first end cover is kept away from the motor shaft, a stator core is arranged outside the extension, and the rotor shell is connected with the fixed seat.

[0011] Optionally, the fixed seat is provided with deep groove ball bearing one and deep groove ball bearing two at the joint with the motor shaft, a spacer sleeve is arranged between the deep groove ball bearing one and the deep groove ball bearing two, and the spacer sleeve is arranged on the outside of one end of the motor shaft close to the first end cover.

[0012] Optionally, the inner gear ring is in interference fit with the shell.

[0013] Optionally, the fixed seat comprises a first fixed part and a second fixed part connected together, the first fixed part is connected with the rotor shell, and the second fixed part is located between the extension and the motor shaft.

[0014] Optionally, a spacer sleeve is arranged between the second fixed part and the motor shaft.

[0015] Optionally, the spacer sleeve is provided with deep groove ball bearing one and deep groove ball bearing two at two ends respectively.

[0016] Optionally, deep groove ball bearing three is arranged between the first end cover and the shell.

[0017] Optionally, the second end cover and the hub cover two are fixedly connected, and deep groove ball bearing four is arranged between the second end cover and the shell.

[0018] Optionally, the second end cover and the hub cover two are fixedly connected, and deep groove ball bearing four is arranged between the second end cover and the shell.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the technical scheme provided by the application has the following beneficial effects:

[0021] The rotor structure of the motor provided by the application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The rotor structure of the motor provided by the application has the following beneficial effects: DETAILED DESCRIPTION

[0023] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0024] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. The terms "first," "second," etc., used in this invention are for the convenience of describing the technical solutions of the invention and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solutions of the invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Example 1

[0026] Combined with appendix Figure 1 As shown, a rotor structure for an electric motor includes a sun gear 8 located within a housing 101 through which a motor shaft 1 passes, and a mounting base 7 for fixing the rotor housing 6; the sun gear 8 is connected to the mounting base 7. The sun gear 8 is directly mounted on the mounting base 7, and the bearing housing of the mounting base 7 mates with the sun gear 8, allowing for one-time clamping and machining, resulting in high part precision. Eliminating the need for a mounting base where the sun gear is transitionally mounted to the rotor housing reduces motor costs. Direct mounting of the sun gear 8 on the mounting base 7 ensures high part precision and low operating noise. The rotor housing 6 is manufactured using stamping, resulting in low cost.

[0027] Example 2

[0028] Combined with appendix Figure 1 As shown, this embodiment proposes a rotor structure for an electric motor, which can be improved as follows compared with Embodiment 1: it includes a hub cover 201, a first end cover 4, a rotor housing 6, a fixing seat 7, a sun gear 8, an internal gear ring 801, a second end cover 41, and a hub cover 202, which are arranged sequentially inside the housing 101 from one end of the housing 101 and can be passed through by the motor shaft 1.

[0029] An optional implementation is that one side of the first end cover 4 is connected to the hub cover 201, the first end cover 4 is fixedly connected to one end of the motor shaft 1, the extension 401 on the other side of the first end cover 4 is kept at a distance from the motor shaft 1, the stator core 5 is provided on the outside of the extension 401, and the rotor housing 6 is connected to the fixed base 7.

[0030] An optional implementation is that a deep groove ball bearing 9 and a deep groove ball bearing 11 are provided at the mating point between the fixed seat 7 and the motor shaft 1; a spacer 10 is provided between the deep groove ball bearing 9 and the deep groove ball bearing 11, and the spacer 10 is sleeved on the outer side of one end of the motor shaft 1 near the first end cover 4.

[0031] An optional implementation is that the internal gear ring 801 is interference-fitted with the housing 101. A hub 11 is provided on the outer side of the housing 101. A flat key 3 is provided at the mating points between the first end cover 4 and the second end cover 41 and the motor shaft 1.

[0032] Example 3

[0033] Combined with appendix Figure 1 As shown, this embodiment proposes a rotor structure for an electric motor, which can be improved as follows compared with Embodiment 1 or 2: The fixing base 7 includes a first fixing part 701 and a second fixing part 702 connected together. The first fixing part 701 is connected to the rotor housing 6, and the second fixing part 702 is located between the extension part 401 and the motor shaft 101.

[0034] In an optional embodiment, the rotor housing 6 includes a first component 61 and a second component 62 connected together. The first component 61 is connected to a first fixing part 701, and the stator core 5 is disposed between the second component 62 and the extension part 401, with the stator core 5 fixed to the extension part 401. In an optional embodiment, a spacer 10 is provided between the second fixing part 702 and the motor shaft 1. In an optional embodiment, deep groove ball bearing 9 and deep groove ball bearing 11 are respectively disposed at both ends of the spacer 10. In an optional embodiment, a deep groove ball bearing 104 is provided between the first end cover 4 and the housing 101.

[0035] An optional implementation is that the second end cover 41 and the hub cover 202 are fixedly connected, and a deep groove ball bearing 105 is provided between the second end cover 41 and the housing 101.

[0036] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A rotor structure for an electric motor, characterized in that, The sun gear is located in the casing and can be penetrated by the motor shaft, and the fixing seat is used for fixing the rotor casing; The sun gear is connected with the fixing seat; The hub cover one, the first end cover, the rotor casing, the fixing seat, the sun gear, the inner ring gear, the second end cover and the hub cover two are sequentially arranged in the casing from one end of the casing; The first end cover is connected with the hub cover one on one side, and the first end cover is fixedly connected with one end of the motor shaft; an extension part on the other side of the first end cover is kept away from the motor shaft, a stator core is arranged outside the extension part, and the rotor casing is connected with the fixing seat; The fixing seat comprises a first fixing part and a second fixing part which are connected together, the first fixing part is connected with the rotor casing, and the second fixing part is located between the extension part and the motor shaft; Deep groove ball bearings one and two are arranged at the joint of the fixing seat and the motor shaft; a spacer sleeve is arranged between the deep groove ball bearings one and two, and the spacer sleeve is arranged outside one end of the motor shaft close to the first end cover; The inner ring gear is in interference fit with the casing; A spacer sleeve is arranged between the second fixing part and the motor shaft.

2. A rotor structure for an electric machine as claimed in claim 1, characterized in that Deep groove ball bearings one and two are respectively arranged at two ends of the spacer sleeve.

3. A rotor structure for an electric machine as claimed in claim 1, characterized in that A deep groove ball bearing three is arranged between the first end cover and the casing.

4. A rotor structure for an electric machine as claimed in claim 1, characterized in that The second end cover and the hub cover two are fixedly connected, and a deep groove ball bearing four is arranged between the second end cover and the casing.

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