CN214480163U

CN214480163U - Motor structure for reducing shaft current

Info

Publication number: CN214480163U
Application number: CN202120629461.0U
Authority: CN
Inventors: 王志军
Original assignee: Suzhou Lego Motors Co ltd
Current assignee: Suzhou Lego Motors Co ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-10-22
Anticipated expiration: 2031-03-29

Abstract

The utility model provides a reduce motor structure of axle electric current, including motor casing, be equipped with motor shaft in the motor casing, its characterized in that: the conducting ring comprises a metal outer ring, the metal outer ring is sleeved on the motor rotating shaft and forms clearance fit with the motor rotating shaft, and the inner edge of the metal outer ring is provided with conducting fibers electrically contacting the motor rotating shaft; the motor shell is provided with a conductive part electrically connected with the conductive ring, and the conductive ring is grounded through the conductive part. The motor structure can obviously reduce the shaft current in the motor, thereby reducing the harm caused by the shaft current and prolonging the service life of the motor.

Description

Motor structure for reducing shaft current

Technical Field

The utility model relates to the technical field of electric machines, in particular to a reduce motor structure of axle electric current.

Background

When the motor works, because of the reasons that the magnetic field intensity is not completely symmetrical, harmonic waves exist in the power supply current, the manufacturing and mounting precision cannot meet the requirement, the rotor is eccentric, the air gap is not uniform, a gap exists between two semicircles of the detachable stator core, the number of the pieces of the stator core formed by stacking the fan-shaped pieces is not suitable, and the like, an incompletely symmetrical magnetic field can be inevitably formed in the motor, and when a rotating shaft of the motor rotates in the magnetic field, an alternating voltage can be generated at two ends of the rotating shaft, which is called as a shaft voltage.

The shaft voltage may damage a bearing system contacting the rotating shaft, and when the shaft voltage is accumulated to a certain level along with the continuous operation of the motor, a lubricating oil film (or grease film) in the bearing may be broken down by the shaft voltage, thereby forming a closed loop inside the motor to generate a shaft current.

The shaft current can generate heat, so that the bearing lubricating oil (or grease) is degraded and failed at high temperature, the bearing is in an intermittent dry grinding state, and finally the bearing is burnt and even sintered adhesion is generated between the bearing and the rotating shaft; damage to the bearings not only increases the vibration and noise of the motor, but also shortens the service life of the motor system.

Disclosure of Invention

To the above problem, the utility model provides a reduce motor structure of axle electric current, this motor structure can show the axle electric current that reduces in the motor to reduce the harm that the axle electric current brought, prolong the life of motor.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a reduce motor structure of axle electric current, includes motor casing, be equipped with motor shaft in the motor casing, its innovation lies in: the conducting ring comprises a metal outer ring which is an annular member, the metal outer ring is sleeved on the motor rotating shaft and forms clearance fit with the motor rotating shaft, and the inner ring of the metal outer ring is provided with conducting fibers which are electrically contacted with the motor rotating shaft; the motor shell is provided with a conductive part electrically connected with the conductive ring, and the conductive ring is grounded through the conductive part.

In the above scheme, the shaft extension end direction of the motor rotating shaft is the front side direction, the motor shell is provided with a front end cover and a rear end cover, the front end cover is provided with a front bearing for supporting the motor rotating shaft, and the rear end cover is provided with a rear bearing for supporting the motor rotating shaft.

Preferably, the conductive ring is provided at a front side position of the front bearing or a rear side position of the rear bearing.

Preferably, the conductive part is the front end cover, the front end cover is made of a metal material, and the conductive ring is fixed on the front end cover. Furthermore, the front end cover is provided with a cavity, and the outer diameter of the conducting ring is in interference fit with the inner diameter of the cavity, so that the conducting ring is embedded and fixed in the cavity; or, the conducting ring and the front end cover are fixed through bolts.

Preferably, the conductive part is the rear end cap, the rear end cap is made of a metal material, and the conductive ring is fixed on the rear end cap. Furthermore, the rear end cover is provided with a cavity, and the outer diameter of the conducting ring is in interference fit with the inner diameter of the cavity, so that the conducting ring is embedded and fixed in the cavity; or, the conducting ring and the rear end cover are fixed through bolts.

Preferably, the conductive fibers are carbon fibers.

The beneficial effects of the utility model reside in that: this motor structure is through setting up the conducting ring to motor shaft, the axle voltage that makes motor shaft produce at the during operation can form a grounded current loop through the mode of "motor shaft → conducting ring → motor casing → ground connection", release to the axle voltage, avoid axle voltage to last the accumulation at motor operation in-process, reach the effect that is showing and reduce axle current, thereby realize reducing the harm of axle current to the bearing, reduce motor noise and vibration that axle current destroys the motor that leads to, the life of extension motor.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

fig. 2 is a schematic view of a conducting ring according to a first embodiment of the present invention;

fig. 3 is a working principle diagram of the first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a second embodiment of the present invention.

In the above drawings: 1. a motor shaft; 2. a flange end cover; 3. a front end cover; 4. a rear end cap; 5. a motor base; 6. a front bearing; 7. a rear bearing; 8. a stator; 9. a rotor; 10. conducting rings; 11. a metal outer ring; 12. conductive fibers.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

the first embodiment is as follows:

as shown in fig. 1 to 3, the motor structure for reducing shaft current includes a motor housing, a motor shaft 1 is arranged in the motor housing, the shaft extension end direction of the motor shaft 1 is the front side direction, the motor housing includes a flange end cover 2, a front end cover 3, a rear end cover 4 and a motor base 5, a front bearing 6 for supporting the motor shaft 1 is arranged on the front end cover 3, a rear bearing 7 for supporting the motor shaft 1 is arranged on the rear end cover 4, and a stator 8 and a rotor 9 are further arranged in the motor housing.

The rear end cover 4 is made of metal materials and is grounded, and a conducting ring 10 fixed with the rear end cover 4 is arranged on the rear end cover 4; the conducting ring 10 comprises a metal outer ring 11 and an inner ring composed of conducting fibers 12, the metal outer ring 11 is an annular member, the metal outer ring 11 is concentrically sleeved on the motor rotating shaft 1 and forms clearance fit with the motor rotating shaft 1, one end of each conducting fiber 12 is connected to the inner ring of the metal outer ring 11, the other end of each conducting fiber 12 forms electrical contact with the motor rotating shaft 1, and the motor rotating shaft 1 is grounded through the conducting fibers 12, the metal outer ring 11 and the rear end cover 4 in sequence; the metal material of the rear end cap 4 and the metal outer ring 11 may be copper, aluminum or an alloy thereof, and the conductive fibers 12 may be carbon fibers.

In this embodiment, a cavity is formed on the rear end cover 4, and the outer diameter of the metal outer ring 11 in the conductive ring 10 is in interference fit with the inner diameter of the cavity, so that the conductive ring 10 is embedded and fixed in the cavity; in addition, the conductive ring 10 and the rear end cap 4 may be fixed by bolts or the like.

In this embodiment, because the conductive fiber 12 can generate continuous friction with the motor shaft 1 when the motor works, and the conductive fiber 12 may be worn and broken after a long time, the conductive ring 10 is disposed at the rear side of the rear bearing 7 in this embodiment, so as to prevent the conductive fiber 12 from being worn and broken in the key working area inside the motor, thereby avoiding the potential safety hazard, and facilitating the cleaning by the user.

In this embodiment, the conductive fibers 12 are circumferentially distributed along the inner edge of the metal outer ring 11 to form a complete ring formed by the conductive fibers 12, and in the implementation process, because the cost of the conductive fibers 12 is high, only a part of the conductive fibers 12 can be selected to be reserved according to actual requirements, so that the conductive effect can be reduced, but the cost can be saved.

In summary, in the embodiment, the conducting ring 10 is arranged for the motor rotating shaft 1, so that a grounded current loop can be formed by the shaft voltage generated by the motor rotating shaft 1 during operation in the modes of "motor rotating shaft 1 → conducting ring 10 → motor housing → grounding", the shaft voltage is released, the shaft voltage is prevented from being continuously accumulated in the motor operation process, and the effect of obviously reducing the shaft current is achieved, so that the damage of the shaft current to the bearing is reduced, the motor noise and vibration caused by the damage of the shaft current are reduced, and the service life of the motor is prolonged; according to experimental data, the motor with the original working life of 10-15 years is presumed to have the working life prolonged to 15-25 years after the structure is adopted, and the effect is very obvious.

As shown in fig. 3, the light arrows in fig. 3 are used to indicate the direction of the derived current, and the dark arrows are used to indicate the direction of the magnetic field inside the motor.

It should be noted that the present solution can only reduce the motor shaft current and cannot completely eliminate the presence of the shaft current.

In addition, in the embodiment, the conducting ring 10 is designed to be an annular structure concentric with the motor shaft 1, in consideration of that continuous friction is generated between the motor shaft 1 and the conducting fiber 12 when the motor shaft 1 rotates, and a small acting force is generated on the conducting ring 10, if the conducting ring is a non-annular structure, the position is easily deformed under the long-time action of the acting force, so that the use effect is affected, and even the potential safety hazard is formed, for the annular structure in the embodiment, the acting forces of the same magnitude are sequentially applied in the circumferential direction along with the rotation of the motor shaft 1, and after the motor shaft 1 rotates for one circle, the acting forces on the conducting ring 10 are equivalent to be cancelled each other; therefore, the conducting ring 10 is designed to be concentric with the motor shaft 1 in the embodiment, so that the conducting ring 10 can work stably for a long time.

In the embodiment, the conductive ring 10 is grounded through the rear end cover 4 made of a metal material, and in an actual implementation process, the conductive ring may also be electrically connected to other parts of the motor housing with conductive performance (for example, the motor base 5 made of a metal material) to achieve grounding; the whole of the motor shell, including the flange end cover 2, the front end cover 3, the rear end cover 4 and the motor base 5, can also be made of metal materials, so that the conductive effect is enhanced; the grounding method can be grounding through a grounding wire, or directly grounding the motor shell.

Example two:

as shown in fig. 4, the difference between the second embodiment and the first embodiment is that the front end cover 3 is made of a metal material and is grounded, and the conductive ring 10 is fixed on the front end cover 3 to form the motor shaft 1 which is grounded through the conductive fiber 12, the metal outer ring 11 and the front end cover 3 in sequence; similar to the first embodiment, in the present embodiment, the conductive ring 10 is disposed at the front side of the front bearing 6.

In this embodiment, a cavity is formed on the front end cover 3, and the outer diameter of the metal outer ring 11 in the conductive ring 10 is in interference fit with the inner diameter of the cavity, so that the conductive ring 10 is embedded and fixed in the cavity; in addition, the conductive ring 10 and the rear end cap 4 may be fixed by bolts or the like.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a reduce motor structure of axle electric current, includes motor casing, be equipped with motor shaft (1) in the motor casing, its characterized in that: the motor is characterized by further comprising a conducting ring (10) fixed on the motor shell, wherein the conducting ring (10) comprises a metal outer ring (11), the metal outer ring (11) is an annular member, the metal outer ring (11) is sleeved on the motor rotating shaft (1) and forms clearance fit with the motor rotating shaft (1), and conducting fibers (12) electrically contacting the motor rotating shaft (1) are arranged on the inner ring of the metal outer ring (11); the motor housing has a conductive portion electrically connected to the conductive ring (10), and the conductive ring (10) is grounded through the conductive portion.

2. A reduced shaft current motor construction as defined in claim 1, wherein: with the axle of motor shaft (1) stretches end direction and is the front side direction, motor casing has a front end housing (3) and a rear end cap (4), be equipped with the support on front end housing (3) front bearing (6) of motor shaft (1), be equipped with the support on rear end cap (4) rear bearing (7) of motor shaft (1).

3. A reduced shaft current motor construction as defined in claim 2, wherein: the conducting ring (10) is arranged at the front side position of the front bearing (6) or the rear side position of the rear bearing (7).

4. A reduced shaft current motor construction as defined in claim 2, wherein: the conductive part is the front end cover (3), the front end cover (3) is made of metal materials, and the conductive ring (10) is fixed on the front end cover (3).

5. The motor structure for reducing shaft current of claim 4, wherein: the front end cover (3) is provided with a cavity, and the outer diameter of the conducting ring (10) is in interference fit with the inner diameter of the cavity, so that the conducting ring (10) is embedded and fixed in the cavity.

6. The motor structure for reducing shaft current of claim 4, wherein: the conducting ring (10) and the front end cover (3) are fixed through bolts.

7. A reduced shaft current motor construction as defined in claim 2, wherein: the conductive part is the rear end cover (4), the rear end cover (4) is made of metal materials, and the conductive ring (10) is fixed on the rear end cover (4).

8. A reduced shaft current motor construction as defined in claim 7, wherein: the rear end cover (4) is provided with a cavity, and the outer diameter of the conducting ring (10) is in interference fit with the inner diameter of the cavity, so that the conducting ring (10) is embedded and fixed in the cavity.

9. A reduced shaft current motor construction as defined in claim 7, wherein: the conducting ring (10) and the rear end cover (4) are fixed through bolts.

10. A reduced shaft current motor construction as defined in claim 1, wherein: the conductive fibers (12) are carbon fibers.