CN212367077U

CN212367077U - Electric machine with reduced galvanic corrosion

Info

Publication number: CN212367077U
Application number: CN202020848298.2U
Authority: CN
Inventors: 陈生; 李章玉; 吴超; 金国华; 肖义杰
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2021-01-15
Anticipated expiration: 2030-05-19

Abstract

The utility model provides a motor with reduce the galvanic corrosion effect. The motor comprises a shell, a bearing and a rotating shaft, wherein the rotating shaft is arranged on the shell through the bearing. The utility model provides a motor with reduce galvanic corrosion effect, all directly be connected with the ground structure electricity with the inner circle and the outer lane of bearing, thereby the inner circle that makes the bearing and the potential difference of outer lane are zero, finally avoid the motor to produce galvanic corrosion and puncture the oil film, the problem of the bearing jamming that the raceway caused, guarantee motor normal work, set up the second pivot simultaneously, shaft coupling and contact, can guarantee the reliable connection between bearing inner circle and the ground structure when avoiding the counter shaft to produce the damage, judge the wearing and tearing condition who acquires the motor to motor winding electric current, thereby judge whether need change the maintenance to the spare part of motor, and carry out the early warning through the state of alarm indicator lamp.

Description

Electric machine with reduced galvanic corrosion

Technical Field

The utility model relates to a drive arrangement technical field, especially a motor with reduce galvanic corrosion effect.

Background

A direct current motor of the air conditioner adopts a PWM (pulse width modulation) scheme for speed regulation, shaft voltage is generated between an inner ring and an outer ring of a motor bearing due to the action of parasitic capacitance of a use environment, the shaft voltage is accumulated to a certain degree, a discharge phenomenon is generated between the inner ring and the outer ring of the motor bearing, the problem of oil film and raceway breakdown is caused, the bearing is blocked due to long-time operation, and the motor cannot work normally.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that the motor cannot normally work due to the fact that voltage is generated between the inner ring and the outer ring of the motor bearing in the prior art, the motor with the electric corrosion reducing effect is provided, wherein the inner ring and the outer ring of the bearing are both indirectly grounded, so that the potential difference of the inner ring and the outer ring of the motor bearing is zero.

The utility model provides a motor, includes casing, bearing and pivot, the pivot passes through the bearing set up in on the casing, the pivot with the inner circle of bearing is fixed to be set up, the casing with the outer lane of bearing is fixed to be set up, the casing is direct or indirect and ground structure electricity is connected, the pivot pass through electric connector direct or indirect with ground structure electricity is connected.

The shell comprises an end cover, the bearing is arranged on the end cover, the outer ring is fixedly connected with the end cover, and the end cover is electrically connected with the grounding structure.

The electric connector comprises a metal coupler, a second rotating shaft and a contact element, the second rotating shaft is arranged on the rotating shaft through the metal coupler, the contact element is directly or indirectly arranged on the grounding structure, and the contact element is in friction contact with the second rotating shaft.

The contact piece is circular in cross section, the second rotating shaft is arranged inside the contact piece, and the circumferential side surface of the second rotating shaft is in friction contact with the inner surface of the contact piece.

The motor is applied to an air conditioner, the air conditioner comprises an electric cabinet, and the electric cabinet forms the grounding structure.

The air conditioner still includes the sheet metal component, the contact set up in on the sheet metal component, the sheet metal component with the electric cabinet electricity is connected, just the sheet metal component constitutes ground structure.

A corrosion detection method of the motor comprises the following steps:

step S1, determining the maximum winding current I0 and a safety factor K1 of the motor, acquiring the real-time winding current It of the motor, and comparing K1I 0 with It;

and step S2, if K1I 0 < It, determining that the motor has corrosion abnormality.

The electric connector includes a metal coupler, a second rotating shaft and a contact element, the second rotating shaft passes through the metal coupler set on the rotating shaft, the contact element directly or indirectly set on the grounding structure, and the contact element and the second rotating shaft are in friction contact, in step S2, the electric connector further includes:

step A1, determining a runnable coefficient K2, and comparing K2 × I0 with It;

step A2, determining that one or more of the second shaft, the bearing or the contact needs to be replaced when k 1I 0 < It ≦ k 2I 0, and the wear dimension of the second shaft is > 0.1mm and/or the wear dimension of the contact is > 0.1 mm.

After the step a1, the method further includes:

when It > k2 × I0, It is determined that the bearing needs to be replaced.

The motor is applied to an air conditioner, the air conditioner is provided with an alarm indicating lamp, and the motor further comprises the following steps after the step A1:

setting a first flashing scheme and a second flashing scheme of an alarm indicator lamp;

when k 1I 0 < It ≦ k 2I 0, the warning indicator light switches to the first blinking scheme;

when It > k2 × I0, the warning indicator light switches to the second flashing scheme.

In the first blinking scheme includes: in each period, the alarm indicator lamp is turned on for n1 seconds and then turned off for n2 seconds;

in the second blinking scheme comprising: in each cycle, the alarm indicator light is turned on for n1 seconds and then turned off for 10 × n1 seconds.

The utility model provides a motor with reduce galvanic corrosion effect, all directly be connected with the ground structure electricity with the inner circle and the outer lane of bearing, thereby the inner circle that makes the bearing and the potential difference of outer lane are zero, finally avoid the motor to produce galvanic corrosion and puncture the oil film, the problem of the bearing jamming that the raceway caused, guarantee motor normal work, set up the second pivot simultaneously, shaft coupling and contact, can guarantee the reliable connection between bearing inner circle and the ground structure when avoiding the counter shaft to produce the damage, judge the wearing and tearing condition who acquires the motor to motor winding electric current, thereby judge whether need change the maintenance to the spare part of motor, and carry out the early warning through the state of alarm indicator lamp.

Drawings

Fig. 1 is a schematic structural diagram of an electric machine according to an embodiment of the present invention, wherein the electric machine has a reduced galvanic corrosion effect;

in the figure:

1. a housing; 2. a bearing; 3. a rotating shaft; 4. an electrical connection; 41. a metal coupling; 42. a second rotating shaft; 43. a contact member; 5. an electric cabinet.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The motor shown in fig. 1 comprises a housing 1, a bearing 2 and a rotating shaft 3, wherein the rotating shaft 3 is arranged on the housing 1 through the bearing 2, the rotating shaft 3 is fixedly arranged with an inner ring of the bearing 2, the housing 1 is fixedly arranged with an outer ring of the bearing 2, and the motor is characterized in that: the shell 1 is directly or indirectly electrically connected with a grounding structure, the rotating shaft 3 is directly or indirectly electrically connected with the grounding structure through the electric connecting piece 4, the outer ring is electrically connected with the grounding structure through the shell 1, so that the outer ring is in a connection state, meanwhile, the inner ring of the bearing 2 is electrically connected with the grounding structure through the bearing 2 and the electric connecting piece 4, so that the inner ring is in the connection state, the outer ring and the inner ring at the moment are in the connection state without potential difference, further, the discharge phenomenon generated between the inner ring and the outer ring of the bearing 2 is avoided, the problem that the motor breaks through an oil film and the bearing 2 is clamped due to a raceway due to the discharge phenomenon is solved.

The shell 1 comprises an end cover, the bearing 2 is arranged on the end cover, the outer ring is fixedly connected with the end cover, the end cover is electrically connected with the grounding structure, the rotating shaft 3 protrudes out of the shell 1 through the end cover, and therefore the rotating shaft 3 can be directly contacted with the electric connecting piece 4 outside the shell 1.

Electric connector 4 includes metal shaft coupling 41, second pivot 42 and contact 43, second pivot 42 passes through metal shaft coupling 41 set up in on the pivot 3, contact 43 directly or indirectly set up in on the ground structure, just contact 43 with second pivot 42 frictional contact utilizes metal shaft coupling 41 to link pivot 3 and second pivot 42 a whole, contact 43 and second pivot 42 frictional contact, guarantees to form reliable current conductor between pivot 3 and the second pivot 42 promptly, avoids contact 43 to produce the friction loss to pivot 3 simultaneously and causes pivot 3 to damage, only need to change second pivot 42 or contact 43 when needs are changed can, the effectual maintenance cost who reduces the motor.

The contact piece 43 has a circular cross section, the second rotating shaft 42 is arranged inside the contact piece 43, and the circumferential side surface of the second rotating shaft 42 is in friction contact with the inner surface of the contact piece 43, that is, the second rotating shaft 42 extends into the contact piece 43, so that the contact area between the contact piece 43 and the second rotating shaft 42 is increased, and the current between the second rotating shaft 42 and the contact piece 43 is ensured to reliably flow.

The motor is applied to an air conditioner, the air conditioner comprises an electric cabinet 5, the electric cabinet 5 forms the grounding structure, and a reliable grounding structure is formed by a grounding wire on the electric cabinet 5.

The air conditioner still includes the sheet metal component, the contact member 43 set up in on the sheet metal component, the sheet metal component with 5 electricity of electric cabinet are connected, just the sheet metal component constitutes ground structure utilizes the sheet metal component to carry out the electricity with contact member 43 and electric cabinet 5 and is connected to constitute reliable the connection with contact member 43 and ground structure.

A corrosion detection method of the motor comprises the following steps:

when the air conditioner is started for the first time in debugging, the motor winding current corresponding to the highest wind speed gear is the maximum winding current I0 of the motor, wherein the winding current is obtained after detection according to a current transformer arranged on a motor driving board, and a safety coefficient K1 that the motor can normally work is obtained through calculation or experiments;

and step S2, if K1I 0 is less than It, determining that the motor is abnormal in corrosion, and requiring a user or a worker to overhaul the motor.

If It is not more than k 1I 0, the motor is normally operated, and the bearing 2 has no problem of electric corrosion.

The electrical connector 4 includes a metal coupler 41, a second rotating shaft 42 and a contact 43, the second rotating shaft 42 is disposed on the rotating shaft 3 through the metal coupler 41, the contact 43 is directly or indirectly disposed on the grounding structure, and the contact 43 is in friction contact with the second rotating shaft 42, in step S2, the method further includes:

step A1, calculating or experimentally obtaining a limit winding current which can work under the condition that the motor has electric corrosion, calculating the limit winding current and a normal working winding current to determine an operable coefficient K2, and comparing K2I 0 and It;

step a2, when k 1I 0 < It ≦ k 2I 0, It indicates that the motor is operating abnormally but still in an operable range, the rotating shaft 3 has a certain clamping phenomenon during rotation, but the use is not affected, at this time, the motor may be overhauled, during the overhaul, the wear size of the second rotating shaft 42 and/or the wear size of the contact element 43 is obtained, and when the wear size of the second rotating shaft 42 is > 0.1mm and/or the wear size of the contact element 43 is > 0.1mm, It indicates that the wear degree is too large, It is determined that one or more of the second rotating shaft 42, the bearing 2, or the contact element 43 needs to be replaced, specifically, the selection is performed according to the user's needs or general experience, the replacement may be performed on all of the three, or only the replacement may be performed on the contact element with relatively serious wear; when the wear dimension of the second rotating shaft 42 and/or the wear dimension of the contact piece 43 is less than or equal to 0.1mm, which indicates that the wear degree is small, the selection of whether to replace one or more of the second rotating shaft 42, the bearing 2 or the contact piece 43 can be performed according to the requirements of a user or routine experience.

After the step a1, the method further includes:

when It is more than k 2I 0, severe electric corrosion exists at the motor bearing 2, obvious clamping stagnation exists in the motor operation process, and the bearing 2 must be replaced.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a motor, includes casing (1), bearing (2) and pivot (3), pivot (3) are passed through bearing (2) set up in on casing (1), pivot (3) with the inner circle of bearing (2) is fixed to be set up, casing (1) with the outer lane of bearing (2) is fixed to be set up, its characterized in that: the shell (1) is directly or indirectly electrically connected with a grounding structure, and the rotating shaft (3) is directly or indirectly electrically connected with the grounding structure through an electric connecting piece (4).

2. The electric machine of claim 1, wherein: the shell (1) comprises an end cover, the bearing (2) is arranged on the end cover, the outer ring is fixedly connected with the end cover, and the end cover is electrically connected with the grounding structure.

3. The electric machine of claim 1, wherein: the electric connector (4) comprises a metal coupler (41), a second rotating shaft (42) and a contact element (43), the second rotating shaft (42) is arranged on the rotating shaft (3) through the metal coupler (41), the contact element (43) is directly or indirectly arranged on the grounding structure, and the contact element (43) is in friction contact with the second rotating shaft (42).

4. The electric machine of claim 3, wherein: the contact piece (43) is circular in cross section, the second rotating shaft (42) is arranged inside the contact piece (43), and the peripheral side surface of the second rotating shaft (42) is in friction contact with the inner surface of the contact piece (43).

5. The electric machine of claim 3, wherein: the motor is applied to an air conditioner, the air conditioner comprises an electric cabinet (5), and the electric cabinet (5) forms the grounding structure.

6. The electric machine of claim 5, wherein: the air conditioner further comprises a sheet metal part, the contact element (43) is arranged on the sheet metal part, the sheet metal part is electrically connected with the electric cabinet (5), and the sheet metal part forms the grounding structure.