CN203261212U - Insulation end cap structure of superspeed permanent-magnet synchronous motor - Google Patents
Insulation end cap structure of superspeed permanent-magnet synchronous motor Download PDFInfo
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- CN203261212U CN203261212U CN 201320246618 CN201320246618U CN203261212U CN 203261212 U CN203261212 U CN 203261212U CN 201320246618 CN201320246618 CN 201320246618 CN 201320246618 U CN201320246618 U CN 201320246618U CN 203261212 U CN203261212 U CN 203261212U
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- end cap
- inner end
- sidewall
- bearing
- insulating
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Abstract
The utility model relates to an insulation end cap structure of a superspeed permanent-magnet synchronous motor; the insulation end cap structure comprises end caps including an outer end cap and a ring-shaped inner end cap; an outer rim in the inner end cap is provided with an enclosed ring-shaped step having an end wall and a side wall as boundaries; the end wall, the side wall, an inner end cap outer periphery connected with the end wall, and an inner end cap inner surface connected with the side wall are all provided with an insulation layer made of glass fabric; the end wall is uniformly provided with a plurality of screw holes; the outer end cap is sleeved on the step and is in bolting connection with the inner end cap through bolts; a bearing is fixedly arranged in a bearing room; insulation pads are arranged between the outer end cap and the inner end cap, and between the outer end cap and bolt heads; and insulation sleeve pipes are arranged between through holes and the bolts. The advantages are that the end cap is designed into a split type comprising the outer end cap and the inner end cap, and the outer end cap and the inner end cap are insulated, thereby realizing the purpose of preventing shaft current corrosion of the motor bearing.
Description
Technical field
The utility model relates to motor cooling technology field, relates in particular to a kind of insulating end cover structure of ultrahigh speed permanent magnet synchronous motor.
Background technology
In rotation process, as long as unbalanced magnetic flux interlinkage is arranged in rotating shaft, then will produce induced potential at the two ends of alternator shaft at generator.This induced potential is called shaft voltage.Shaft voltage mainly can be divided into 2 parts: 1. rotating shaft is cut uneven magnetic flux and the shaft voltage that produces at the axle two ends when rotated; 2. the shaft voltage that produces at the rotating shaft two ends owing to there is axial leakage flux.Cause generator field uneven, and then the reason that produces shaft voltage has 3 aspects: 1. unbalanced owing to the magnetic circuit of making and the reason such as mounting process causes and air gap is asymmetric, this is unavoidable factor.Produce shaft voltage when 2. unsymmetrical short-circuit occurs for generator or outside.This is because the short circuit of stator winding partly has induced current, and it stops resultant flux by the stator region at this part winding place; And this moment, the not short circuit part of stator winding does not but have this phenomenon, and the asymmetric equivalence of this effect and stator magnetic circuit produces axially take fundamental frequency as main alternating flux.If the stator winding lead-out wire is positioned at the both sides of generator length direction, then asymmetric external short circuit also may produce shaft voltage.3. energized circuit ground connection or rotor interturn short-circuit also can produce very strong axial uneven magnetic flux mouth.When shaft voltage reaches certain value, form the closed-loop path generation current by bearing and base thereof etc., this electric current is called shaft current.When the current density by bearing roller surpasses 0.2A/cm
2, just may produce galvano-cautery to bearing roller, bearing is destroyed, and jeopardizes unit safety operation.
For the permanent magnet synchronous motor (rotating speed is at 6500r/min and above) of ultrahigh rotating speed; the higher shaft voltage of easier generation under ultrahigh speed is rotated; therefore reasonable disposition and install reliable shaft current protective device is for seeming particularly important in the protection of ultrahigh speed permanent magnet synchronous motor.
The utility model content
The purpose of the utility model embodiment is for the structural shortcoming of prior art, a kind of insulating end cover structure of ultrahigh speed permanent magnet synchronous motor is proposed, by end cap being arranged to outer end cap and the inner end cap of split, and make between outer end cap and the inner end cap and insulate, avoided the shaft current corrosion of bearing of motor.
In order to reach above-mentioned utility model purpose, the insulating end cover structure of a kind of ultrahigh speed permanent magnet synchronous motor that the utility model embodiment proposes is achieved through the following technical solutions:
A kind of insulating end cover structure of ultrahigh speed permanent magnet synchronous motor comprises end cap and bearing, it is characterized in that: described end cap comprises the outer end cap that is connected for motor casing, and the inner end cap with bearing chamber; The outer rim of described inner end cap inboard is provided with a step that is the closed circular ring-type take end wall and sidewall as the boundary, and described end wall, sidewall, the inner end cap outer circumference surface that joins with described end wall and be provided with the insulating barrier of being made by glass wool cloth with inner end cap inner surface that described sidewall joins, in addition, be evenly equipped with some screws on the described end wall; The corresponding described screw of inner circumference portion that is circular described outer end cap offers through hole, and described outer end cap is set in this step and by bolt and described inner end cap bolt; Described bearing is fixedly installed in the described bearing chamber; Between described outer end cap and the end wall, between described outer end cap and the sidewall, be provided with insulation spacer between described bolt head and the described outer end cap, be provided with insulating sleeve between described through hole and the bolt.
Be equipped with the swallow-tail form annular groove on described end wall, sidewall, inner end cap outer circumference surface and the inner end cap inner surface, the surface that joins of described insulating barrier and described end wall, sidewall, inner end cap outer circumference surface and inner end cap inner surface is provided with the dovetail flanges ring that embeds described swallow-tail form annular groove.
Described inner end cap inner surface only arranges circular described insulating barrier at the peripheral edge portion that joins with described sidewall.
Described screw is blind hole.
Compared with prior art, the beneficial effects of the utility model are: by end cap being arranged to outer end cap and the inner end cap of split, and making between outer end cap and the inner end cap and insulate, realized having avoided the purpose of the shaft current corrosion of bearing of motor.Adopt the end cover mechanism in the present embodiment, even being installed, plain bearing can prevent effectively that also the shaft current of motor generation is to the galvano-cautery of motor bearings, and do not affect the heat transfer performance of bearing, thereby effectively prolong the life-span of bearing life and motor, this end cover structure is simple, have low cost, easy accessibility, advantage that intensity is high.
Description of drawings
By the description of its exemplary embodiment being carried out below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the utility model will become apparent and understand easily.
Fig. 1 is the overall structure schematic diagram of motor among the utility model embodiment;
Fig. 2 is the end view of motor among the utility model embodiment;
Fig. 3 is the overall structure schematic diagram of end cap among the utility model embodiment;
Fig. 4 is the whole generalized section of end cap among the utility model embodiment;
Fig. 5 is the structural representation of inner end cap among the utility model embodiment;
Fig. 6 is the generalized section of inner end cap among the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail, so that technical staff's of the same trade understanding:
As Figure 1-3, label represents respectively:
Earthing screw 1; shell 2; armature spindle 3; brush holder 4; bearing 5; inner end cap 6; outer end cap 7; fan shroud 8; ground connection lug 9; cooler 10; delivery port 11; water inlet 12; stator body 13; stator winding 14; permanent magnet 15; rotor yoke 16; protective device 17 tests the speed; outlet box 18; heater 19; cover plate 20; through hole 21; bearing chamber 22; bolt 23; through hole 24; insulating barrier 25; the first insulation spacer 26; insulating sleeve 27; the second insulation spacer 28; the 3rd insulation spacer 29; flanged ring 30.
Shown in Fig. 1-6, a kind of insulating end cover structure of ultrahigh speed permanent magnet synchronous motor is provided in the present embodiment, mainly comprise end cap and bearing 5.Wherein:
End cap comprises the outer end cap 7 that connects for being connected with motor casing, and the inner end cap 6 with bearing chamber 22.
The outer rim of inner end cap 6 inboards is provided with a step that is the closed circular ring-type, and this step is take end wall and sidewall as the boundary, and wherein end wall refers to the step surface that is circular, and sidewall refers to the step facade that is disc.The part of described end wall, sidewall, inner end cap 6 outer circumference surfaces that join with described end wall and inner end cap 6 inner surfaces that join with described sidewall is provided with the insulating barrier 25 of being made by glass wool cloth.Be exactly that inner end cap 6 inner surfaces only arrange circular insulating barrier 25 at the peripheral edge portion that joins with described sidewall specifically.These insulating barriers 25 that are arranged on diverse location are structure as a whole.For insulating barrier 25 firmly is fixed on the inner end cap 6, be equipped with the swallow-tail form annular groove on described end wall, sidewall, inner end cap 6 outer circumference surfaces and inner end cap 6 inner surfaces, described insulating barrier 25 is provided with the dovetail flanges ring 30 that embeds described swallow-tail form annular groove with the surface that joins of described end wall, sidewall, inner end cap outer circumference surface and inner end cap inner surface.In addition, be evenly equipped with some screws on the described end wall, described screw is blind hole.
Bearing 5 is fixedly installed in the bearing chamber 22 of inner end cap 6.
By such structure, realize insulation by insulating barrier 25, a plurality of insulation spacer and insulating sleeve 27 between outer end cap 7 and the inner end cap 6, even the damaged insulation property that affect appear in arbitrary portion, other insulation system still can insulate the two, has avoided like this shaft current corrosion of bearing of motor.Adopt the end cover mechanism in the present embodiment, even being installed, plain bearing can prevent effectively that also the shaft current of motor generation is to the galvano-cautery of motor bearings, and do not affect the heat transfer performance of bearing, thereby effectively prolong the life-span of bearing life and motor, this end cover structure is simple, have low cost, easy accessibility, advantage that intensity is high.
Referring to Fig. 1-2, it is for adopting the electric motor structure of this end cap.Comprise motor casing, rotor, stator and cooler 10.Wherein:
This motor casing comprises shell 2 and the end cap that is fixed on shell 2 both ends of the surface, and shell 2 and end cap define the cavity of a hollow jointly thus.The outer rim of outer end cap 7 namely is fixed on the end of shell 2.Also be provided with the cover plate 20 around end cap at the two ends of shell 2.
Stator is made of stator body 13 and stator winding 14, and stator body 13 is fixedly mounted on the inner surface of this shell 2.Rotor is located in the stator, comprises armature spindle 3 and the rotor yoke 16 that radially extends from armature spindle 3, and permanent magnet 14 is set on the rotor yoke 16, and permanent magnet 14 and stator are configured to form end play between them.Armature spindle 7 is supported by bearing 5 and is stretched out outside the shell 2.Also be fixedly installed fan shroud 8 in the two ends of rotor yoke 16 in the shell 2, be used for the air-flow that stops that rotor produces.
For further playing the purpose of avoiding shaft current, on the outer ring of bearing 5, also be fixedly installed brush holder 4, the carbon brush that contacts with armature spindle 3 is set on the brush holder 4.
In addition, inside at shell 2 is provided with cooling water channel, corresponding, the top of described shell 2 namely arranges cooler 10, cooler 10 is interconnected with cooling water channel, the delivery port 11 that the side opening of cooler 10 is provided with the water inlet 12 that enters for cooling water and is used for cooling water flow out of.
Also be fixedly installed having heaters 19, earthing screw 1, ground connection lug 9 on the shell 2, protective device 17 and outlet box 18 test the speed.Earthing screw 1 and ground connection lug 9 all are electrically connected with shell 2, are used for shell 2 ground connection.Heater 19 is used for adding thermoelectric perpetual motion machine, and its supply power voltage adopts civil power.Outlet box 18 is used for the electric power system of this motor with the outside is electrically connected.17 of the protective devices that test the speed are used for measuring in real time the rotating speed of rotor.
Can find out that by said structure the utility model is by being arranged to end cap outer end cap and the inner end cap of split, and make between outer end cap and the inner end cap and insulate, realize having avoided the purpose of the shaft current corrosion of bearing of motor.Adopt the end cover mechanism in the present embodiment, even being installed, plain bearing can prevent effectively that also the shaft current of motor generation is to the galvano-cautery of motor bearings, and do not affect the heat transfer performance of bearing, thereby effectively prolong the life-span of bearing life and motor, this end cover structure is simple, have low cost, easy accessibility, advantage that intensity is high.
More than be elaborated for invention intention of the present utility model and execution mode by embodiment; but the utility model one of ordinary skill in the art be appreciated that; the above embodiment of the utility model only is one of preferred embodiment of the present utility model; be the length restriction; here can not all execution modes of particularize; any enforcement that can embody the utility model claim technical scheme is all in protection range of the present utility model.
It should be noted that; above content is in conjunction with concrete execution mode further detailed description of the utility model; can not assert that embodiment of the present utility model only limits to this; under the guidance of above-described embodiment; those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improvement or distortion drop in the protection range of the present utility model.
Claims (4)
1. the insulating end cover structure of a ultrahigh speed permanent magnet synchronous motor comprises end cap and bearing, it is characterized in that: described end cap comprises the outer end cap that is connected for motor casing, and the inner end cap with bearing chamber; The outer rim of described inner end cap inboard is provided with a step that is the closed circular ring-type take end wall and sidewall as the boundary, and described end wall, sidewall, the inner end cap outer circumference surface that joins with described end wall and be provided with the insulating barrier of being made by glass wool cloth with inner end cap inner surface that described sidewall joins, in addition, be evenly equipped with some screws on the described end wall; The corresponding described screw of inner circumference portion that is circular described outer end cap offers through hole, and described outer end cap is set in this step and by bolt and described inner end cap bolt; Described bearing is fixedly installed in the described bearing chamber; Between described outer end cap and the end wall, between described outer end cap and the sidewall, be provided with insulation spacer between described bolt head and the described outer end cap, be provided with insulating sleeve between described through hole and the bolt.
2. the insulating end cover structure of a kind of ultrahigh speed permanent magnet synchronous motor according to claim 1, it is characterized in that: be equipped with the swallow-tail form annular groove on described end wall, sidewall, inner end cap outer circumference surface and the inner end cap inner surface, the surface that joins of described insulating barrier and described end wall, sidewall, inner end cap outer circumference surface and inner end cap inner surface is provided with the dovetail flanges ring that embeds described swallow-tail form annular groove.
3. the insulating end cover structure of a kind of ultrahigh speed permanent magnet synchronous motor according to claim 2 is characterized in that: described inner end cap inner surface only arranges circular described insulating barrier at the peripheral edge portion that joins with described sidewall.
4. the insulating end cover structure of a kind of ultrahigh speed permanent magnet synchronous motor according to claim 3, it is characterized in that: described screw is blind hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320246618 CN203261212U (en) | 2013-05-09 | 2013-05-09 | Insulation end cap structure of superspeed permanent-magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320246618 CN203261212U (en) | 2013-05-09 | 2013-05-09 | Insulation end cap structure of superspeed permanent-magnet synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203261212U true CN203261212U (en) | 2013-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320246618 Expired - Lifetime CN203261212U (en) | 2013-05-09 | 2013-05-09 | Insulation end cap structure of superspeed permanent-magnet synchronous motor |
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| CN (1) | CN203261212U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499012A (en) * | 2021-12-30 | 2022-05-13 | 西安中车永电捷力风能有限公司 | Insulating end cover structure suitable for offshore wind driven generator |
-
2013
- 2013-05-09 CN CN 201320246618 patent/CN203261212U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499012A (en) * | 2021-12-30 | 2022-05-13 | 西安中车永电捷力风能有限公司 | Insulating end cover structure suitable for offshore wind driven generator |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131030 |