An integrated end cover assembly applied to a permanent magnet integrated machine

Abstract

The application relates to the field of electric machines, in particular to an integrated end cover assembly applied to a permanent magnet integrated machine, which comprises an end cover body 100, a concave cavity part 120 is formed in the middle part of the end cover body 100, the inner side of the concave cavity part 120 is integrally connected with an inner circular part 130, and the outer side of the concave cavity part 120 is integrally connected with an outer peripheral part 110; a bearing chamber 101 is arranged in the side circular surface of the inner circular part 130, a bearing 102 is arranged in the bearing chamber 101, an inner bearing cover 103 for fixing the bearing 102 is arranged on the inner side of the inner circular part 130, an inner oil baffle 104 for sealing the bearing 102 is arranged in the inner bearing cover 103, an outer bearing cover 105 for fixing the bearing 102 is arranged on the outer side of the inner circular part 130, and an outer oil baffle 106 for sealing the bearing 102 is arranged in the outer bearing cover 105. The integrated end cover assembly applied to the permanent magnet integrated machine can reduce the radial size of the electric machine, is suitable for occasions where the radial installation space is insufficient, and expands the use range of the permanent magnet integrated machine.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to an integrated end cap assembly for a permanent magnet integrated machine. Background Technology

[0002] Permanent magnet integrated motors combine a motor and a frequency converter into one unit. Due to their high efficiency, small size, and high power density, they are mainly used in locations with limited installation space. To reduce the risk of failure caused by the reducer, permanent magnet integrated motors also adopt a direct drive method. Therefore, compared to conventional motors, permanent magnet integrated motors have a larger diameter and shorter length.

[0003] To facilitate the design of three-phase cable outlets and cooling system water circuits, the inverters of existing permanent magnet integrated machines are usually installed on the top or sides of the motor, resulting in a larger radial space occupation compared to conventional motors. The end caps of non-drive ends are not involved in the inverter design of permanent magnet integrated machines.

[0004] For mine and outdoor motors, the non-drive end cover of the motor needs to be designed with a sensor cover that has a sealing function for dust and moisture protection.

[0005] Existing permanent magnet integrated motors have large radial dimensions, making them difficult to install in some confined spaces. For motors with short axial dimensions, there is also the problem of insufficient space for inverter installation. For permanent magnet integrated motors used in mines and outdoors, the design of wiring and protection for sensors such as temperature sensors, rotary transformers, and speed sensors is challenging.

[0006] Therefore, the integrated end cover assembly design method for installing frequency converters on the non-drive side of the motor is the main problem that this invention aims to solve. Summary of the Invention

[0007] This invention aims to solve the problems of excessive radial dimensions in some narrow spaces of permanent magnet integrated machines and the difficulty in designing dust protection for components such as rotary transformers and temperature sensors, and provides an integrated end cap assembly for use in permanent magnet integrated machines.

[0008] This invention is achieved using the following technical solution: An integrated end cover assembly for a permanent magnet integrated machine includes an end cover body. The end cover body has a concave center forming a cavity. An inner circular portion is integrally connected to the inner side of the cavity, and an outer peripheral portion is integrally connected to its outer side. A bearing chamber is fitted inside the side annular surface of the inner circular portion, and a bearing is fitted inside the bearing chamber. An inner bearing cover for fixing the bearing is fitted inside the inner circular portion, and an inner oil baffle for sealing the bearing is fitted inside the inner bearing cover. An outer bearing cover for fixing the bearing is fitted outside the inner circular portion, and an outer oil baffle for sealing the bearing is fitted inside the outer bearing cover. An end cover protrusion ring for assembly and positioning is provided on the inner side of the outer peripheral portion. The end cover body is fitted to the outer side of the rear end cover body at the machine base port via the end cover protrusion ring stop, forming a stop with the outer edge of the machine base port for installing the inverter housing. A pressure cap is fitted on the outer bearing cap. The pressure cap is embedded in the cavity of the end cover body and, together with the outer peripheral surface, serves as the inverter base.

[0009] The above-mentioned non-drive end cover design has an end cover body size smaller than the base size, forming a stop for mounting the frequency converter; a platform is machined on the outer side of the cavity of the end cover body for mating with the pressure cover; the pressure cover is embedded in the end cover and together they form an installation platform for mounting the internal components of the frequency converter, constituting the frequency converter base.

[0010] Further preferably, the end cap body has a reinforcing rib inside the recessed cavity. A reinforcing rib is also provided between the end cap protrusion and the outer side of the recessed cavity; this reinforcing rib design increases overall strength and stability.

[0011] More preferably, a rotary transformer is mounted on the outer bearing cover.

[0012] More preferably, the inner side of the pressure cap is provided with a pressure cap protrusion ring for assembly and positioning. The pressure cap is assembled to the outer bearing cap through the pressure cap protrusion ring stop and then fixed to the outer bearing cap with screws.

[0013] More preferably, the inner oil baffle is installed on the rotating shaft by a heat-shrink fitting, and is clearance-fitted with the inner bearing cover. The outer oil baffle is installed on the rotating shaft by a heat-shrink fitting, and is clearance-fitted with the outer bearing cover.

[0014] This invention is reasonably designed. The integrated end cap assembly applied to permanent magnet integrated machines can reduce the radial dimension of the motor, making it suitable for occasions with insufficient radial installation space, expanding the application range of permanent magnet integrated machines, and has great practical application value. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a half-sectional view of the integrated end cap assembly described in this invention.

[0018] Figure 2 This is a front view of the integrated end cap assembly (hidden pressure cap) of the present invention.

[0019] In the diagram: 100-End cover body, 101-Bearing chamber, 102-Bearing, 103-Inner bearing cover, 104-Inner oil baffle, 105-Outer bearing cover, 106-Outer oil baffle, 107-Pressure cover, 108-Pressure cover protrusion ring, 109-End cover protrusion ring, 110-Outer circle, 120-Cavity, 130-Inner circle, 111-Reinforcing rib, 112-Screw, 113-Rotary transformer, 200-Frame, 300-Inverter housing, 400-Shaft. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0021] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0023] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] An integrated end cap assembly for use in a permanent magnet integrated machine includes: an end cap body 100, a bearing chamber 101, a bearing 102, an inner bearing cover 103, an inner oil baffle 104, an outer bearing cover 105, an outer oil baffle 106, a pressure cover 107, etc.

[0025] The end cover body 100 is installed on the port of the base 200. The base is round on the inside and square on the outside, and the outer perimeter of the end cover body 100 is square.

[0026] like Figure 1 As shown, the end cap body 100 is recessed in the middle to form a cavity 120, which saves internal space in the motor. The inner side of the cavity 120 is integrally connected to the inner circle portion 130, and the outer side is integrally connected to the outer peripheral portion 110.

[0027] like Figure 1 As shown, the inner side of the outer periphery 110 is provided with an end cover protrusion 109 for assembly and positioning. The end cover body 100 is assembled to the outer side of the rear end cover body 100 of the base 200 through the stop of the end cover protrusion 109. The end cover body 100 and the outer edge of the base 200 form a stop for mounting the inverter housing 300. That is, the end cover size is smaller than the base size to form a stop for mounting the inverter. The end cover body 100 is fixed to the base 200 by screws 112.

[0028] like Figure 1 As shown, a bearing chamber 101 is assembled within the side annular surface of the inner circular portion 130, and a bearing 102 is assembled within the bearing chamber 101. An inner bearing cover 103 for fixing the bearing 102 is assembled inside the inner circular portion 130. An inner oil baffle 104 for sealing the bearing 102 is assembled inside the inner bearing cover 103. The inner oil baffle 104 is fitted to the inner bearing cover 103 via an insert method (i.e., the inner oil baffle 104 is installed on the rotating shaft 400 via a heat-shrink fitting, with a clearance fit to the inner bearing cover 103). An outer bearing cover 105 for fixing the bearing 102 is assembled on the outer circular portion 130. An outer oil baffle 106 for sealing the bearing 102 is assembled inside the outer bearing cover 105. The outer oil baffle 106 is fitted to the outer bearing cover 105 via an insert method (i.e., the outer oil baffle 106 is installed on the rotating shaft 400 via a heat-shrink fitting, with a clearance fit to the outer bearing cover 105). The bearing 102 is fixed and sealed by the inner oil baffle 104, the inner bearing cover 103, the outer oil baffle 106 and the outer bearing cover 105.

[0029] like Figure 1 As shown, a rotary transformer 113 is installed on the outer bearing cover 105. The rotary transformer 113 is used to acquire rotor position and speed signals. No additional dustproof or moisture-proof protection is required; it is protected by the inverter housing along with the inverter itself.

[0030] like Figure 1As shown, a pressure cap 107 is mounted on the outer bearing cover 105. A pressure cap protrusion 108 for mounting and positioning is provided on the inner side of the pressure cap 104. The pressure cap 107 is mounted on the outer bearing cover 105 through the stop of the pressure cap protrusion 108 and then fixed to the outer bearing cover 105 with screws 112. The pressure cap 107 is embedded in the cavity of the end cover body 100, that is, the side of the cavity of the end cover body 100 is machined into a ring plane that fits with the outer periphery of the pressure cap 107. The pressure cap 107 and the end cover body 100 together form an installation platform. The pressure cap 107 and the outer peripheral surface 110 together serve as the inverter base for mounting internal inverter components.

[0031] like Figure 1 As shown, a reinforcing rib 111 is provided in the recessed portion 120 of the end cap body 100. A reinforcing rib 111 is provided between the end cap protruding ring 109 and the outer side of the recessed portion 120. Reinforcing ribs are welded to both sides of the end cap body 100 to increase strength and stability.

[0032] In practical applications, the three-phase output of the motor and the output of the sensor pass through the gap between the square frame and the stator core, and are introduced into the frequency converter through the through hole on the non-drive end cover.

[0033] In this invention, the end cover design of the permanent magnet integrated inverter when installed on the non-drive side of the motor can reduce the radial dimension of the motor and eliminate the need for traditional designs for sensor dustproof and moistureproof protection.

[0034] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. An integrated end cap assembly for use in a permanent magnet integrated machine, characterized in that: The device includes an end cap body (100), which has a recessed center forming a cavity (120). The inner side of the cavity (120) is integrally connected to an inner circular portion (130), and its outer side is integrally connected to an outer peripheral portion (110). A bearing chamber (101) is fitted inside the side annular surface of the inner circular portion (130), and a bearing (102) is fitted inside the bearing chamber (101). An inner bearing cover (103) for fixing the bearing (102) is fitted inside the inner circular portion (130), and an inner oil baffle (104) for sealing the bearing (102) is fitted inside the inner bearing cover (103). An outer oil baffle for fixing the bearing (102) is fitted outside the inner circular portion (130). An outer bearing cover (105) is provided, and an outer oil baffle (106) for sealing the bearing (102) is installed inside the outer bearing cover (105); an end cover protrusion ring (109) for assembly and positioning is provided on the inner side of the outer peripheral part (110); the end cover body (100) is assembled with the end cover protrusion ring (109) through the stop of the stop and is assembled on the outer side of the rear end cover body (100) of the base (200) and the outer edge of the base (200) to form a stop for installing the inverter housing (300); a pressure cover (107) is installed on the outer bearing cover (105), and the pressure cover (107) is embedded in the cavity of the end cover body (100) and together with the surface of the outer peripheral part (110) serves as the inverter base.

2. The integrated end cap assembly for a permanent magnet integrated machine according to claim 1, characterized in that: The end cap body (100) has a reinforcing rib (111) inside the cavity (120).

3. An integrated end cap assembly for a permanent magnet integrated machine according to claim 1 or 2, characterized in that: A rotary transformer (113) is installed on the outer bearing cover (105).

4. An integrated end cap assembly for a permanent magnet integrated machine according to claim 3, characterized in that: The end cap body (100) is fixed to the base (200) by screws (112).

5. An integrated end cap assembly for a permanent magnet integrated machine according to claim 4, characterized in that: The inner side of the pressure cap (107) is provided with a pressure cap protrusion ring (108) for assembly positioning.

6. An integrated end cap assembly for a permanent magnet integrated machine according to claim 5, characterized in that: The pressure cap (107) is assembled onto the outer bearing cap (105) by means of the pressure cap protrusion ring (108) stop and then fixed onto the outer bearing cap (105) by screws (112).

7. An integrated end cap assembly for a permanent magnet integrated machine according to claim 6, characterized in that: The inner oil baffle (104) is installed on the rotating shaft (400) by means of heat fitting and is clearance-fitted with the inner bearing cover (103).

8. An integrated end cap assembly for a permanent magnet integrated machine according to claim 7, characterized in that: The outer oil baffle (106) is installed on the rotating shaft (400) by a heat fitting and is clearance-fitted with the outer bearing cover (105).

9. An integrated end cap assembly for a permanent magnet integrated machine according to claim 2, characterized in that: A reinforcing rib (111) is provided between the end cap protrusion (109) and the outer side of the cavity (120).

10. An integrated end cap assembly for a permanent magnet integrated machine according to claim 1, characterized in that: The outer periphery of the end cap body (100) is square.

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