CN203466701U - Double-cage rotor for explosion-proof asynchronous motor - Google Patents
Double-cage rotor for explosion-proof asynchronous motor Download PDFInfo
- Publication number
- CN203466701U CN203466701U CN201320435162.9U CN201320435162U CN203466701U CN 203466701 U CN203466701 U CN 203466701U CN 201320435162 U CN201320435162 U CN 201320435162U CN 203466701 U CN203466701 U CN 203466701U
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- cage
- double
- rotor
- end ring
- cage bar
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- Windings For Motors And Generators (AREA)
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Abstract
A double-cage rotor for an explosion-proof asynchronous motor comprises outer cage strips, outer end rings, inner end rings, inner cage strips and a rotor core. The outer end rings are wound on the outer cage strips, the inner end rings are wound on the inner cage strips, and the rotor core is wound on a rotating shaft of the motor. The double-cage rotor is good in integrality, the mounting of a positioning sleeve is omitted, the structure improves mechanical strength, and generated axial displacement caused by vibration of guide strips in a groove when the motor is started or runs is eliminated. Due to the fact that the thickness of the outer end rings is increased, distortion cannot be caused, the integral manufacturing quality of an explosion-proof three-phase asynchronous motor with the double-cage rotor is effectively improved, and the utilization requirements of users are satisfied.
Description
technical field:
The utility model relates to electric motors, particularly a kind of flame proof asynchronous motor double-cage rotor.
background technology:
The threephase asynchronous of flame-proof type double squirrel cage rotor structure drives large and medium-sized drag conveyor under coal mine, and colliery conditions down-hole is poor, and the severe coal that often occurs of environment is pressed scraper-trough conveyer situation, and equipment can not normally be moved.If operating personnel carry out starting device to pressing coal to slip not process, may occur once cannot normally starting operation, then carry out for the second time or several times.Startup now belongs to heavy load starting, motor is in stall state, starting current is 5～7 times of rated current, larger starting current increases rotor copper loss greatly, because the copper loss producing can make end ring and cage bar reach the high temperature of 600 ℃～700 ℃, cause the outer end ring sliver of rotor to be heated inhomogeneous, make copper bar short transverse and stretch out stack of lamination to present larger temperature gradient, thereby form larger thermal stress.Simultaneously outer cage copper bar is subject to high temperature deformation deliquescing, and mechanical strength declines, and under the effect of thermal stress, electromagnetic force and centrifugal force, first makes stress ratio rupture compared with concentrated notch place and end ring welding place fatigue.Minority welding weakness presents localized hyperthermia's arcing and blows and snap because contact resistance is excessive.
At present, in the flame proof asynchronous motor of the rotor of two cage-shaped structure, outer end ring and rotor core distance is longer, and in order to prevent that sliver axial endplay from laying positioning sleeve between end ring and rotor core outside, every end is symmetrical places 4.Due to sliver and flute profile fit clearance, the heat-conductive characteristic difference that load startup, frequent starting produce can make to produce inhomogeneous temperature rise between each cage bar.Thereby between each cage bar, will produce different axial displacement and make sliver produce axial tension stress, and make cage bar produce electric and magnetic oscillation stress, particularly at motor, just started moment, vibration amplitude reaches maximum, it is while normally moving 50～60 times, frequency is 100Hz, along with the rising of rotating speed and the increase of starting current and increase, because each effect of stress point mostly concentrates near the weld bond of cage bar and end ring, and startup each time just alternation once, the destruction of each stress increases with increase and the temperature rise accumulation of the number of times starting like this.Due to the monolateral thickness 1～1.5 of positioning sleeve, bad mechanical strength, under electric power, centrifugal force superposition, outer end ring, outer cage bar produce axial displacement, positioning sleeve generation gross distortion part raises up, bossing is wiped mutually with stator winding coil, has damaged motor winding insulation, causes damaging motor.
summary of the invention:
In view of this, be necessary to provide a kind of flame proof asynchronous motor double-cage rotor.
A kind of flame proof asynchronous motor double-cage rotor, comprise outer cage bar, outer end ring, interior end ring, interior cage bar, rotor core, the outer end ring of two ends suit of outer cage bar, end ring in the two ends suit of interior cage bar, outer cage bar, interior cage bar and rotor core and motor shaft concentric are installed.
Preferably, press degree of flicking to stay 2.5 to 3 millimeters of gaps rotor core dress.
Preferably, outer end ring sectional area is constant, increases axial width, and outer end ring and outer cage bar contact area are increased.
Double-cage rotor good integrity of the present utility model, and cancelled the installation of positioning sleeve, this structure has improved mechanical strength, the axial displacement having produced while having eliminated motor start-up that chatter the causes operation of sliver in groove.Outer end ring thickness increases and can not cause torsional deformation, effectively improves the complete machine workmanship of three asynchronous motors of flame proof that double-cage rotor of the present utility model is installed, and meets user's instructions for use.
accompanying drawing explanation:
Fig. 1 is the double-cage rotor part-structure schematic diagram before improving.
Fig. 2 is double-cage rotor part-structure schematic diagram for the flame proof asynchronous motor after improving.
In figure: outer cage bar 1, positioning sleeve 2, outer end ring 3, interior end ring 4, interior cage bar 5, rotor core 6, axle 7, outer cage bar 8, outer end ring 9, interior end ring 10, interior cage bar 11, rotor core 12, axle 13.
embodiment:
Refer to Fig. 1, original double-cage rotor comprises outer cage bar 1, positioning sleeve 2, outer end ring 3, interior end ring 4, interior cage bar 5, rotor core 6, the outer end ring 3 of two ends suit of outer cage bar 1, end ring 4 in the two ends suit of interior cage bar 5, outer cage bar 1, interior cage bar 5, rotor core 6 are installed with motor shaft 7 concentrics, outer end ring 3 is longer with the distance of rotor core 6, and positioning sleeve 2 is for preventing sliver axial endplay, and every end is symmetrical places 4.And lay positioning sleeve 2 weak spot of this structure exactly.Due to sliver and flute profile fit clearance, the heat-conductive characteristic difference that load startup, frequent starting produce can make to produce inhomogeneous temperature rise between each cage bar.Thereby between each cage bar, will produce different axial displacement and make sliver produce axial tension stress, and make cage bar produce electric and magnetic oscillation stress, particularly at motor, just started moment, vibration amplitude reaches maximum, it is while normally moving 50～60 times, frequency is 100Hz, along with the rising of rotating speed and the increase of starting current and increase, because each effect of stress point mostly concentrates near the weld bond of cage bar and end ring, and startup each time just alternation once, the destruction of each stress increases with increase and the temperature rise accumulation of the number of times starting like this.Due to the monolateral thickness 1～1.5 of positioning sleeve 2, bad mechanical strength, under electric power, centrifugal force superposition, outer end ring 3, outer cage bar 1 produce axial displacement, there is gross distortion part and raise up in positioning sleeve 2, bossing is wiped mutually with stator winding coil, has damaged motor winding insulation, causes damaging motor.
Refer to Fig. 2, in the utility model, flame proof asynchronous motor comprises outer cage bar 8, outer end ring 9, interior end ring 10, interior cage bar 11, rotor core 12 with double-cage rotor, the outer end ring 9 of two ends suit of outer cage bar 8, end ring 10 in the two ends suit of interior cage bar 11, outer cage bar 8, interior cage bar 11 and rotor core 12 are installed with motor shaft 13 concentrics.Press degree of flicking to stay 2.5 to 3 millimeters of gaps rotor core 12 dresses;
Outer end ring 9 sectional areas are constant, increase axial width, and outer end ring 9 and outer cage bar 8 contacts area are increased.
Double-cage rotor good integrity of the present utility model, and cancelled the installation of positioning sleeve 2, this structure has improved mechanical strength, the axial displacement having produced while having eliminated motor start-up that chatter the causes operation of sliver in groove.Outer end ring 9 thickness increase and can not cause torsional deformation, effectively improve the complete machine workmanship of three asynchronous motors of flame proof that double-cage rotor of the present utility model is installed, and meet user's instructions for use.
Claims (2)
1. a flame proof asynchronous motor double-cage rotor, it is characterized in that: flame proof asynchronous motor comprises outer cage bar, outer end ring, interior end ring, interior cage bar, rotor core with double-cage rotor, the outer end ring of two ends suit of outer cage bar, end ring in the two ends suit of interior cage bar, outer cage bar, interior cage bar and rotor core and motor shaft concentric are installed.
2. flame proof asynchronous motor double-cage rotor as claimed in claim 1, is characterized in that: rotor core dress presses degree of flicking to stay 2.5 to 3 millimeters of gaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320435162.9U CN203466701U (en) | 2013-07-22 | 2013-07-22 | Double-cage rotor for explosion-proof asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320435162.9U CN203466701U (en) | 2013-07-22 | 2013-07-22 | Double-cage rotor for explosion-proof asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203466701U true CN203466701U (en) | 2014-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320435162.9U Expired - Lifetime CN203466701U (en) | 2013-07-22 | 2013-07-22 | Double-cage rotor for explosion-proof asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203466701U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346656A (en) * | 2013-07-22 | 2013-10-09 | 宁夏西北骏马电机制造股份有限公司 | Improved method of double-cage rotor and double-cage rotor for explosion-proof asynchronous motor |
-
2013
- 2013-07-22 CN CN201320435162.9U patent/CN203466701U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346656A (en) * | 2013-07-22 | 2013-10-09 | 宁夏西北骏马电机制造股份有限公司 | Improved method of double-cage rotor and double-cage rotor for explosion-proof asynchronous motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140305 |