CN218387065U - Electric machine - Google Patents

Abstract

The utility model discloses a motor, which comprises a shell, a rotating shaft and a bearing, wherein the shell comprises a circumferential shell and an end shell, the end shell is provided with a containing groove for installing the bearing, and a bearing outer sleeve is assembled on the rotating shaft; the end part shell is provided with a holding groove, the end part shell is provided with a rotating shaft, the rotating shaft is arranged in the holding groove, the end part shell is provided with a conducting part, the conducting part is arranged in the holding groove and used for electrically connecting the end part shell and the rotating shaft, and the resistance of the conducting part is smaller than that of the bearing. The motor has the advantages of compact structure and high integration level, and can reduce the corrosion of shaft current to the bearing.

Description

Electric machine

Technical Field

The utility model relates to the technical field of electric motors, concretely relates to motor.

Background

During operation of the motor, a potential difference exists between two ends of the rotating shaft or between the rotating shaft and the ground, the potential difference is called a shaft voltage, and the shaft voltage generates a current through some conduction paths, and the current is a shaft current.

One common conduction path is a rotating shaft-bearing-casing-bearing-rotating shaft, and in the conduction path, electrical contact is formed between the steel ball and the inner and outer rings of the bearing in the bearing, so that partial discharge can be formed, and the problem of electrical corrosion is easily caused when the bearing runs for a long time, and the service performance and the service life of the bearing and the motor are further influenced.

Therefore, how to provide a solution to reduce the electric corrosion of the bearing caused by the shaft current remains a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a motor, the compact structure of this motor, the integrated level is high, and can reduce the corruption of axle electric current to the bearing.

In order to solve the technical problem, the utility model provides a motor, which comprises a casing, a rotating shaft and a bearing, wherein the casing comprises a circumferential casing and an end casing, the end casing is provided with a containing groove for installing the bearing, and a bearing outer sleeve is assembled on the rotating shaft; the end part shell is provided with a holding groove, the end part shell is provided with a rotating shaft, the rotating shaft is arranged in the holding groove, the end part shell is provided with a conducting part, the conducting part is arranged in the holding groove and used for electrically connecting the end part shell and the rotating shaft, and the resistance of the conducting part is smaller than that of the bearing.

So set up, electrically conductive part can carry out the short circuit to the bearing for the axle current can flow to the pivot from electrically conductive part more, rather than flowing to the pivot through the bearing, like this, the axle current can reduce by a wide margin to the influence of bearing, and the possibility that the bearing is corroded is lower relatively, and the performance and the life of bearing and motor all can obtain guaranteeing.

Moreover, the conductive part is arranged in the accommodating groove which is originally and immediately arranged on the end part shell, extra installation space is not needed, the structure of the motor is more compact after the conductive part is installed, the integration level can be higher, and the normal installation and transportation of the motor cannot be influenced.

Optionally, the conductive member includes a conductive brush that is in sliding contact with an outer wall surface of the rotating shaft.

Optionally, the conductive member further includes a wave washer, the receiving groove has a groove bottom wall, two axial ends of the wave washer are respectively abutted against the groove bottom wall and the bearing, and the conductive brush is fixedly mounted on the wave washer.

Optionally, the wave washer includes wave crest portions and wave trough portions alternately arranged in the circumferential direction, the wave crest portions are abutted against the groove bottom wall, the wave trough portions are abutted against the bearing, and the conductive brush is fixedly mounted in the wave trough portions.

Optionally, the number of the conductive brushes is multiple, and each conductive brush is arranged around the central axis of the rotating shaft.

Optionally, the electric rotating shaft further comprises a conductive bushing, the accommodating groove has a groove peripheral wall, the conductive bushing is mounted in the accommodating groove and attached to the groove peripheral wall, one end of the conductive component is electrically connected to the conductive bushing, and the other end of the conductive component is electrically connected to the rotating shaft.

Optionally, the conductive bushing is made of steel.

Optionally, the rotating shaft and the casing enclose a device space therebetween, the motor further comprises a stator core and a rotor core, and the stator core and the rotor core are both installed in the device space.

Drawings

Fig. 1 is a partial view of one embodiment of an electric machine provided by the present invention;

FIG. 2 is a schematic view of the structure of a conductive member;

fig. 3 is a partial structural view of a wave washer.

The reference numerals are explained below:

1 cabinet, 1a equipment space, 11 circumferential shell, 12 end shell, 121 accommodating groove;

2, rotating a shaft;

3, a bearing;

4 conductive members, 41 conductive brushes, 42 wave washers, 421 crest portions, 422 trough portions;

5, a conductive lining;

6 a stator core;

7 rotor core.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

In the description of the embodiments of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless expressly specified or limited otherwise, and for example, "connected" may or may not be detachably connected; may be directly connected or indirectly connected through an intermediate.

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout, and wherein like reference numerals refer to like elements throughout. In addition, the term "plurality" as used herein means two or more unless otherwise specified in the present application.

In the description of the embodiments of the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one of 8230, and" comprising 8230does not exclude the presence of additional like elements in a process, method, article, or apparatus comprising the element.

Referring to fig. 1 to 3, fig. 1 is a partial view of an embodiment of an electric machine according to the present invention, fig. 2 is a schematic structural diagram of a conductive component, and fig. 3 is a partial structural diagram of a wave washer.

As shown in fig. 1, the present invention provides a motor, which comprises a casing 1, a rotating shaft 2 and a bearing 3. The casing 1 includes a circumferential casing 11 and end casings 12, the number of the end casings 12 is two, the two end casings 12 can be respectively arranged at two axial ends of the circumferential casing 11, the end casings 12 and the circumferential casing 11 are split structures, the two can be respectively manufactured, and then, the connection can be performed through connecting pieces in the form of screws and the like. The end housing 12 is provided with a receiving groove 121 for mounting the bearing 3, the bearing 3 can be sleeved on the rotating shaft 2 for supporting the rotating shaft 2, and the relative rotation between the rotating shaft 2 and the casing 1 can be realized.

An equipment space 1a can be formed between the rotating shaft 2 and the casing 1, and other components included in the motor, such as a stator core 6, a rotor core 7 and the like, can be installed in the equipment space 1a. The specific structural form of the stator core 6, the rotor core 7 and other components is not limited herein, and in practical application, those skilled in the art can design according to actual needs, as long as the requirements can satisfy the utility model provides a motor operation requirement can.

The reasons for the shaft current generation during the operation of the motor are manifold: 1) Because the magnetic circuit is asymmetric (a tooth groove structure, a rotor is eccentric and the like), annular magnetic flux is easily formed inside the motor, and further shaft current is formed; 2) The influence of the common mode voltage of the frequency converter brings extra shaft current sources, which are specifically represented by high-frequency circulating current, capacitive common mode current and discharge current, pulse capacitive current generated by the potential difference between the shaft and the base, and the like. When the shaft current flows through the bearing, the bearing is easily subjected to electric corrosion, and the service performance and the service life of the bearing and the motor are further influenced.

To this end, the embodiment of the utility model provides a motor, this motor can be connected casing and pivot electricity to the equipotential structure of casing and pivot is found as far as possible, like this, can carry out the short circuit to the bearing, makes axle current flow direction bearing less relatively, and then can reduce the electrocorrosion problem of bearing.

In detail, as also shown in fig. 1, the motor provided by the present invention may further include a conductive member 4, the conductive member 4 may be disposed in the accommodating groove 121, the conductive member 4 is used for electrically connecting the end housing 12 and the rotating shaft 2, and the resistance of the conductive member 4 is smaller than that of the bearing 3.

So set up, electrically conductive part 4 can carry out the short circuit to bearing 3 for the axle current can flow to pivot 2 from electrically conductive part 4 more, rather than flowing to pivot 2 through bearing 3, and like this, the influence of axle current to bearing 3 can reduce by a wide margin, and bearing 3 is corroded the possibility relatively lower, and the performance and the life of bearing and motor all can be guaranteed.

Moreover, the conductive part 4 is arranged in the accommodating groove 121 which is originally existed in the end part shell 12, no extra installation space is needed, after the conductive part 4 is installed, the structure of the motor is more compact, the integration level can be higher, and the normal installation and transportation of the motor can not be influenced.

Here, the embodiment of the present invention does not limit the specific structure of the conductive component 4, and in practical applications, those skilled in the art can set the configuration according to specific needs as long as the technical effects described above can be satisfied.

In some alternative embodiments, the conductive member 4 may include a conductive brush 41, and the conductive brush 41 may be a carbon brush made of graphite, a carbon brush containing copper, or the like.

One end of the conductive brush 41 away from the rotating shaft 2 can be fixedly arranged and can be electrically connected with the housing 1 directly or indirectly (through other components), and one end of the conductive brush 41 facing the rotating shaft 2 can be in sliding contact with the outer wall surface of the rotating shaft 2, so that the electrical connection between the stationary housing 1 and the rotating shaft 2 is realized.

In some alternative embodiments, the conductive member 4 may further include a wave washer 42, the receiving groove 121 may have a groove bottom wall, and both axial ends of the wave washer 42 may abut against the groove bottom wall and the bearing 3, respectively. One end of the conductive brush 41, which is far away from the rotating shaft 2, may be fixedly mounted on the wave washer 42, the specific fixing manner may be welding, clamping, screw connection, or the like, and the specific fixing position may be an inner wall surface of the wave washer 42, or an axial end surface of the wave washer 42.

It should be appreciated that the wave washer 42 is an existing component of the motor, and functions within the receiving groove 121 to effectively absorb the axial gap, to improve the fixing reliability of the bearing 3, and to effectively absorb vibration to reduce noise. The wave washer 42 is used as the conductive part 4, the existing parts in the motor can be fully utilized, the cost of the motor can be greatly reduced, and the structure compactness of the motor can be further improved.

With reference to fig. 3, the wave washer 42 may include ridges 421 and valleys 422 alternately arranged in the circumferential direction, the ridges 421 may abut against the bottom wall of the groove, the valleys 422 may abut against the bearing 3, that is, the ridges 421 may protrude toward the bottom wall of the groove, and the valleys 422 may protrude toward the bearing 3. The conductive brush 41 may be fixedly installed in the wave trough 422, so that the transmission path of the shaft current may be shortened to a greater extent, the conductive resistance may be reduced, and the flow of the shaft current to the bearing 3 may be reduced to a greater extent.

The number of the conductive brush 41 may be one. Or, the number of the conductive brushes 41 may also be multiple, and at this time, each conductive brush 41 may be arranged around the central axis of the rotating shaft 2, so as to improve the reliability of the electrical connection between the conductive component 4 and the rotating shaft 2; as shown in fig. 2, which shows a scheme including three conductive brushes 41, the three conductive brushes 41 may be mounted to the wave washer 42 at equal intervals in the circumferential direction.

In some optional embodiments, the present invention provides that the motor further includes a conductive bush 5, the accommodating groove 121 has a groove peripheral wall, the conductive bush 5 may be mounted on the accommodating groove 121 and may be attached to the groove peripheral wall, and the bearing 3 may be specifically mounted in the conductive bush 5. The conductive bush 5 may be made of steel, ceramic, or the like, which has high hardness, and on the one hand, the fixing reliability of the bearing 3 can be improved, and on the other hand, the wear of the end housing 12 can be reduced.

Specifically, the wave washer 42 may be attached to the conductive bush 5, and an outer wall surface of the wave washer 42 may be in contact with an inner wall surface of the conductive bush 5.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. The motor is characterized by comprising a machine shell (1), a rotating shaft (2) and a bearing (3), wherein the machine shell (1) comprises a circumferential shell (11) and an end shell (12), the end shell (12) is provided with a containing groove (121) for installing the bearing (3), and the bearing (3) is sleeved on the rotating shaft (2);

the bearing further comprises a conductive part (4), the conductive part (4) is arranged in the accommodating groove (121), the conductive part (4) is used for electrically connecting the end part shell (12) and the rotating shaft (2), and the resistance of the conductive part (4) is smaller than that of the bearing (3).

2. The machine according to claim 1, wherein the conductive member (4) comprises a conductive brush (41), and the conductive brush (41) is in sliding contact with an outer wall surface of the rotating shaft (2).

3. The machine according to claim 2, characterized in that the conductive part (4) further comprises a wave washer (42), the accommodating groove (121) has a groove bottom wall, the wave washer (42) abuts against the groove bottom wall and the bearing (3) at both axial ends, and the conductive brush (41) is fixedly mounted on the wave washer (42).

4. The machine according to claim 3, wherein the wave washer (42) comprises wave crests (421) and wave troughs (422) alternately arranged in the circumferential direction, the wave crests (421) and the groove bottom wall abut, the wave troughs (422) abut the bearing (3), and the conductive brushes (41) are fixedly mounted to the wave troughs (422).

5. The machine according to claim 2, characterized in that the number of the conductive brushes (41) is plural, and each of the conductive brushes (41) is arranged around a central axis of the rotating shaft (2).

6. The machine according to any of claims 1-5, further comprising a conductive bushing (5), wherein the receiving slot (121) has a slot peripheral wall, the conductive bushing (5) is mounted to the receiving slot (121) and conforms to the slot peripheral wall, one end of the conductive member (4) is electrically connected to the conductive bushing (5), and the other end of the conductive member (4) is electrically connected to the rotating shaft (2).

7. The machine according to claim 6, characterised in that the conductive bushing (5) is made of steel.

8. The electric machine according to any of claims 1-5, characterized in that an equipment space (1 a) is enclosed between the rotating shaft (2) and the machine casing (1), the electric machine further comprises a stator core (6) and a rotor core (7), and the stator core (6) and the rotor core (7) are both mounted in the equipment space (1 a).

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