CN211429144U

CN211429144U - Rotor current eliminating device of external rotor motor

Info

Publication number: CN211429144U
Application number: CN202020268142.7U
Authority: CN
Inventors: 张春晖; 左成
Original assignee: Jiangsu Jiaxuan Intelligent Industrial Technology Co ltd
Current assignee: Jiangsu Jiaxuan Intelligent Industrial Technology Co ltd
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2020-09-04
Anticipated expiration: 2030-03-06

Abstract

The utility model discloses an external rotor electric machine's rotor current remove device, include: rotor assembly, end cover subassembly, stator assembly, center pin, electrically conductive device, supporting seat and ground point, rotor assembly both ends are connected with the end cover subassembly respectively, the end cover subassembly is connected with the stator assembly, stator assembly and center pin are connected, and the center pin both ends are connected with two supporting seats respectively, be equipped with the ground point on the supporting seat, the ground point is connected with electrically conductive device's one end, simultaneously electrically conductive device's the other end and end cover or the oil cap sliding contact of end cover subassembly the utility model discloses in, through electrically conductive device with the leading-in ground point of rotor current from the end cover of end cover subassembly or oil cap, then introduce the underground, make the rotor current not pass through the bearing, its is with low costs, and application scope is wide.

Description

Rotor current eliminating device of external rotor motor

Technical Field

The utility model relates to an external rotor electric machine field, more specifically say, relate to an external rotor electric machine's rotor current remove device.

Background

The rotor voltage of the outer rotor motor refers to the potential difference between two ends of the rotor or between the rotor and the bearing. The rotor voltage is formed into a loop by a rotor steel cylinder, an end cover, a bearing, an oil film and a stator, when the oil film is damaged, current is generated in the loop, namely rotor current, and under the normal condition, a lubricating oil film exists between the rotor and the bearing to play an insulating role. For lower rotor voltage, the lubricating oil film can still protect the insulating property of the rotor, and shaft current cannot be generated. However, when the rotor voltage increases to a certain value, particularly when the motor is started, the lubricating oil film in the bearing is not formed stably, and the shaft voltage breaks through the oil film to discharge, so that a loop is formed, and a shaft current is formed. The rotor current will pass through the metal contact points of the bearing and the rotor, and because the metal contact points are very small, the current density of the points is high, high temperature is generated instantaneously, the bearing is locally fused, the fused bearing alloy splashes under the action of rolling force, small pits are burnt on the inner surface of the bearing, and the condition that the inner surface of the bearing is pressed to form a strip-shaped arc flaw is usually shown.

In the prior art, ceramic bearings are usually adopted or insulating liners are added on the outer rings of the bearings, and when the insulating ceramic bearings are adopted, the cost is higher; when the insulating liner is added on the outer ring of the bearing, the strength of the insulating material is usually lower, and the insulating material is usually applied to occasions with low power and low torque and is not suitable for occasions with high power and high torque.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the aforesaid provided, provide a low in production cost, be suitable for the rotor current remove device of high-power big moment of torsion's external rotor electric machine.

The technical scheme provided comprises the following steps:

rotor current eliminating device of external rotor electric machine, include: the rotor assembly is connected with the end cover assembly, the end cover assembly is in sliding contact with the conductive device, and the conductive device is connected with the grounding point.

Outer rotor electric machine's rotor current remove device, the end cover subassembly includes oil cap, end cover and bearing, the oil cap with the end cover is connected, the end cover inner circle with bearing inner race interference fit.

The rotor current eliminating device of the external rotor motor of the present invention, the conductive device is in contact with the end cap or the oil cap.

The rotor current eliminating device of the external rotor motor, the conducting device and the rotor assembly contact.

Rotor current remove device of external rotor electric machine, electric installation includes brush, wire and overspeed device tensioner, the brush is connected with the one end of wire and overspeed device tensioner's one end respectively, the other end of wire and overspeed device tensioner's the other end is connected with the ground point respectively.

The rotor current eliminating device of the external rotor motor, the tensioning device is non-conductive.

Rotor current remove device of external rotor electric machine, electric installation includes brush, electrically conductive overspeed device tensioner, the brush is connected with electrically conductive overspeed device tensioner's one end, electrically conductive overspeed device tensioner's the other end and ground point are connected.

The rotor current eliminating device of the external rotor motor of the present invention, one, the number of the brushes provided on the end cover assembly is 1-8.

Rotor current eliminating device of external rotor electric machine, the brush adopts the electrographite brush.

The utility model has the advantages that:

the current on the rotor is led into the ground through the conducting device, so that the current does not pass through the bearing, the rotor current is eliminated, and meanwhile, the current-eliminating device is low in cost, wide in application range and more suitable for occasions with high power and large torque.

Drawings

Fig. 1 is a schematic structural diagram of the rotor current eliminating device of the external rotor electric machine of the present invention: rotor assembly 1, end cover subassembly 2, brush 3, wire 4, overspeed device tensioner 5, center pin 6, supporting seat 7, earthing point 8, stator assembly 9, terminal box 10

Detailed Description

Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it will be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The following description is of the preferred embodiment of the invention, and is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the invention. The protection scope of the present invention is subject to the limitations defined by the appended claims.

In the preferred embodiment of the rotor current eliminating device of the external rotor electric machine of the present invention, as shown in fig. 1, the device includes: the stator assembly is arranged at the two ends of the rotor assembly, the two end cover assemblies are respectively positioned at the two ends of the stator assembly and are connected with the stator assembly, the interior of the stator assembly is connected with the central shaft, the electric brushes are respectively distributed on the two end cover assemblies and are in sliding contact with the electric brushes, the two electric brushes are respectively connected with the two conducting wires and the two tensioning devices, the two supporting seats are respectively connected with the central shaft and are positioned at the outer parts of the two ends of the rotor assembly, grounding points are distributed on the supporting seats and are respectively connected with the conducting wires and the tensioning devices, and rotor current can be generated between the rotor assembly and the stator assembly in working engineering.

In a preferred embodiment of the rotor current removing apparatus for an external rotor electric machine, the end cap assembly includes an oil cap, an end cap, and a bearing, the oil cap is connected to the end cap, an inner ring of the end cap is in interference fit with an outer ring of the bearing, and the oil cap, the end cap, and the bearing are integrally mounted.

In the preferred embodiment of the rotor current eliminating device for an external rotor motor of the present invention, the rotor assembly is welded to the end cap of the end cap assembly.

In the preferred embodiment of the rotor current eliminating device of the external rotor motor, the stator assembly includes a bearing seat, and the integrated end cover assembly is installed on the bearing seat, so that the end cover assembly is convenient to install and detach.

In the preferred embodiment of the rotor current eliminating device of the outer rotor motor of the present invention, the brush may also be in sliding contact with the rotor assembly.

In the preferred embodiment of the rotor current eliminating device of the outer rotor motor of the present invention, the brush is an electrochemical graphite brush, which reduces the cost.

In the preferred embodiment of the rotor current eliminating apparatus for an external rotor electric machine, the total number of the adopted brushes is 2, the oil cover of the end cover assembly at the left end of the spindle is sequentially connected with one brush, one wire and one tensioning device, and the oil cover of the end cover assembly at the right end of the spindle is sequentially connected with another brush, one wire and one tensioning device, so that the apparatus is suitable for the external rotor electric machine with high power and large torque.

In a preferred embodiment of the rotor current removing apparatus for an external rotor motor, one end of the wire is connected to the brush, and the other end thereof is connected to the ground point, and the wire is introduced with the rotor current through the brush, and then is introduced into the ground via the ground point, thereby preventing the rotor current from flowing to the bearing and damaging the bearing.

In the preferred embodiment of the rotor current eliminating apparatus for an external rotor motor according to the present invention, the tension device and the wire may be further combined to form a conductive tension device, the brush is connected to one end of the conductive tension device, the other end of the conductive tension device is connected to the ground point, the rotor current is introduced into the conductive tension device through the brush, and then the rotor current is introduced into the ground via the ground point.

In the preferred embodiment of the rotor current eliminating apparatus for an external rotor electric machine, the ground point may be located at any position of the external rotor electric machine, and the ground point is preferably disposed on the central shaft or the supporting base.

In the preferred embodiment of the rotor current eliminating device of the external rotor motor of the present invention, a junction box is disposed at the leftmost position of the main shaft for connecting a lead or a cable.

To further explain the present invention, in one embodiment, a rotor current removing apparatus of an outer rotor motor includes: the rotor assembly, the end covers, the oil cover, the bearing, the stator assembly, the central shaft, the electric brush, the conducting wire, the tensioning device, the supporting seat, the grounding point and the junction box, wherein two ends of the rotor assembly are respectively connected with the two end covers, the oil cover and the bearing are sequentially connected, the electric brush is distributed on the oil cover, the electric brush is respectively connected with one ends of the conducting wire and the tensioning device, the other ends of the conducting wire and the tensioning device are simultaneously connected with the grounding point which is positioned on the supporting seat, the two supporting seats are respectively connected with the central shaft and positioned at two ends of the central shaft, the bearing is connected with the central shaft, the stator assembly is positioned inside the rotor assembly, the central shaft is connected with the stator assembly and is positioned inside the stator assembly, the central line of the central shaft is coincided with the, then the current flows to the oil cover on the end cover, and is led into the ground from the conducting wire through the electric brush on the oil cover, so that the current does not pass through the bearing, the cost is low, and the application range is wide.

The above-mentioned embodiments are further described in detail for the purpose of the present invention, and it should be understood that although the present invention is described in terms of implementation, the above-mentioned embodiments are exemplary and not intended to limit the scope of the present invention, and any changes, modifications, substitutions and variations of the above-mentioned embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention should be included in the scope of the present invention.

Claims

1. A rotor current removing device of an outer rotor motor, comprising: the rotor assembly is connected with the end cover assembly, the end cover assembly is in sliding contact with the conductive device, and the conductive device is connected with the grounding point.

2. The rotor current eliminating device of an external rotor motor according to claim 1, wherein the end cover assembly comprises an oil cover, an end cover and a bearing, the oil cover is connected with the end cover, and the inner ring of the end cover is in interference fit with the outer ring of the bearing.

3. The rotor current eliminating device of an external rotor motor according to claim 2, wherein the conductive means is in sliding contact with the end cap or the oil cap.

4. The rotor current eliminating device of an external rotor motor according to claim 1, wherein the conductive means is in contact with the rotor assembly.

5. The rotor current eliminating device of an external rotor motor according to claim 1, wherein the conducting means includes a brush, a wire, and a tension means, the brush is connected to one end of the wire and one end of the tension means, respectively, and the other end of the wire and the other end of the tension means are connected to a ground point, respectively.

6. The rotor current eliminating device of an external rotor motor according to claim 5, wherein the tension means is electrically non-conductive.

7. The rotor current eliminating device of an external rotor motor according to claim 1, wherein the conducting means includes a brush, a conducting tensioner, the brush being connected to one end of the conducting tensioner, and the other end of the conducting tensioner being connected to a ground point.

8. The rotor current eliminating device of an external rotor motor according to claim 1, wherein the number of brushes provided on one of said end cap assemblies is 1 to 8.

9. The rotor current eliminating device of an external rotor motor according to claim 5, 7 or 8, wherein the brush is an electrochemical graphite brush.