CA2379150A1 - Method and device for determining the width of the air gap between rotor and stator of a rotating electric machine, in particular an annular mo tor - Google Patents
Method and device for determining the width of the air gap between rotor and stator of a rotating electric machine, in particular an annular mo tor Download PDFInfo
- Publication number
- CA2379150A1 CA2379150A1 CA002379150A CA2379150A CA2379150A1 CA 2379150 A1 CA2379150 A1 CA 2379150A1 CA 002379150 A CA002379150 A CA 002379150A CA 2379150 A CA2379150 A CA 2379150A CA 2379150 A1 CA2379150 A1 CA 2379150A1
- Authority
- CA
- Canada
- Prior art keywords
- air gap
- width
- camera
- rotor
- stator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Manufacture Of Motors, Generators (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
A method and device for determining the width of a gap (3) between a rotor (2) and a stator (1) in a rotating electric machine, especially an annular motor, whereby the device for determining the width of the gap (3) is provided with a camera (4) which records an image of said gap (3).
Description
' CA 02379150 2002-O1-11 Description Method and device for determining the width of the air gap between rotor and stator of a rotating electric machine, in particular an annular motor The invention relates to a method and ~i device for determining the width of the air gap betwE~en rotor and stator of a rotating electric machine, in particular an annular motor.
In annular motors, in particular, the width of the air gap between the rotor and the stator i~~ a critical variable. It is known to determine the width of the air gap by means of magnetic, capacitive or ultrasonic distance measurements. It is further known to determine the width of the air gap by measuring the magnetic field in the air gap by means of Hall sensors.
Furthermore, an optical measuring device, which is arranged in the tangential direction, is disclosed by the document US-A-390,84,44.
It is an object of the invention to specify a device and a method by means of which the width of. the air gap between rotor and stator of a rotating electric machine, in particular an annular motor, can be determined more precisely.
According to the invention, the object is achieved by a device as claimed in claim 1 and a method as claimed in claim 7. In this case, to determine the width of the air gap between rotor and stator of a rotating electric machine (a generator or an electric motor), in particular an annular motor, the width of the air gap is recorded by means of a camera. A device according to the invention for determining the width of the air gap between rotor and stator of a rotating electric AMENDED SHEET
- la -machine, in particular an annular motor, comprises a camera to record an image of the air gap . By means of the invention, it is possible to determine the width of the air gap between stator and rotor of AMENDED SHEET
In annular motors, in particular, the width of the air gap between the rotor and the stator i~~ a critical variable. It is known to determine the width of the air gap by means of magnetic, capacitive or ultrasonic distance measurements. It is further known to determine the width of the air gap by measuring the magnetic field in the air gap by means of Hall sensors.
Furthermore, an optical measuring device, which is arranged in the tangential direction, is disclosed by the document US-A-390,84,44.
It is an object of the invention to specify a device and a method by means of which the width of. the air gap between rotor and stator of a rotating electric machine, in particular an annular motor, can be determined more precisely.
According to the invention, the object is achieved by a device as claimed in claim 1 and a method as claimed in claim 7. In this case, to determine the width of the air gap between rotor and stator of a rotating electric machine (a generator or an electric motor), in particular an annular motor, the width of the air gap is recorded by means of a camera. A device according to the invention for determining the width of the air gap between rotor and stator of a rotating electric AMENDED SHEET
- la -machine, in particular an annular motor, comprises a camera to record an image of the air gap . By means of the invention, it is possible to determine the width of the air gap between stator and rotor of AMENDED SHEET
a rotating electric machine, in particular an annular motor, more precisely than is possible by the known methods. Furthermore, the invention permits more rapid determination of the width of the air gap than by the known methods. This applies in particular with respect to measuring systems which are based on the=_ measurement of the magnetic field in the air gap, since in the case of such measurements, in order to avoid erroneous measurements, an average has to be formed over the pole of the electric motor on which the measurement is made.
The invention, on the other hand, permits a number of measurements per pole, so that even the shape of the pole can be depicted.
In advantageous refinement of the invention, the device for determining the width of the air gap between rotor and stator comprises an evaluation device to evaluate the image of the air gap recorded by means of the camera.
In further advantageous refinement of tr.e invention, the evaluation device is designed to determine the width of the air gap by counting pixels in the image of the air gap recorded by means of the camera..
In further advantageous refinement of tr.e invention, the camera is designed as a line-scan camera.
In further advantageous refinement of t~.e invention, the device for determining the width of the air gap between rotor and stator comprises a light source to irradiate the air gap.
In further advantageous refinement of tr.e invention, the light source is a laser.
Further advantages and inventive details emerge from the following description of exemplary embodiments. In detail:
The invention, on the other hand, permits a number of measurements per pole, so that even the shape of the pole can be depicted.
In advantageous refinement of the invention, the device for determining the width of the air gap between rotor and stator comprises an evaluation device to evaluate the image of the air gap recorded by means of the camera.
In further advantageous refinement of tr.e invention, the evaluation device is designed to determine the width of the air gap by counting pixels in the image of the air gap recorded by means of the camera..
In further advantageous refinement of tr.e invention, the camera is designed as a line-scan camera.
In further advantageous refinement of t~.e invention, the device for determining the width of the air gap between rotor and stator comprises a light source to irradiate the air gap.
In further advantageous refinement of tr.e invention, the light source is a laser.
Further advantages and inventive details emerge from the following description of exemplary embodiments. In detail:
FIG 1 shows an exemplary embodiment of a device according to the invention for determining the width of the air gap between stator and rotor, FIG 2 shows an exemplary embodiment of the arrangement of a camera on an annular motor.
FIG 1 shows an exemplary embodiment c>f a device according to the invention for determining the width of the air gap 3 between the stator 1 and th.e rotor 2 of an electric motor, in particular an annular motor. For this purpose, a camera 4 is provided. In an exemplary refinement, the camera 4 has lasers, with which the air gap 3 is irradiated. Reference symbol 5 in this case designates the beams emitted by the lasers. The optical axis 6 of the chamber 4 is aimed at the air gap 3 or approximately at the air gap 3. Using the camera 4, which is advantageously designed as a counting camera, an image of the air gap 3 is recorded. The camera 4 is connected to an evaluation device (not shown) which, by counting the pixels of the image of the air gap 3, determines the width of the air gap. Provision is advantageously made for it to be possible to calibrate the evaluation device.
The illumination of the air gap with lasers or a light source is optional. In addition to th~= embodiment illustrated, in which the air gap is irradiated from the side on which the camera is also arranged, a transmitted light method is also pos~;ible as an alternative. In this case, the air gap is irradiated by a light source from the other side. In this way, the image of the air gap is brighter than the image of the stator 1 and the rotor 2.
If an additional light source is dispensed with, then it is particularly advantageous to record and to evaluate an infrared image of the air ga~~ 3 with the camera 4. As a result of the heating of stator 1 and - 3a -rotor 2 during the operation of the electric motor, particularly good contrast relating to the air gap 3 is produced in this way.
In an advantageous way, as FIG 1 illustrates, two lines are produced with laser light, which then coincide with one another when the camera 4 is at a specific distance from the air gap 3. In this way, the distance of the camera 4 from the air gap 3 can be set particularly precisely.
FIG 2 shows a cross section through an annular motor, in this case reference symbol 1 designates the stator and reference symbol 2 designates the rotor of the annular motor. Reference symbol 3 designates the air gap between stator 1 and rotor 2. A winding shield 7 is provided for protection against the rotating rotor 2.
In this case, the camera 4 is particularly advantageously arranged on the side of the winding shield 7 facing the rotor 2.
FIG 1 shows an exemplary embodiment c>f a device according to the invention for determining the width of the air gap 3 between the stator 1 and th.e rotor 2 of an electric motor, in particular an annular motor. For this purpose, a camera 4 is provided. In an exemplary refinement, the camera 4 has lasers, with which the air gap 3 is irradiated. Reference symbol 5 in this case designates the beams emitted by the lasers. The optical axis 6 of the chamber 4 is aimed at the air gap 3 or approximately at the air gap 3. Using the camera 4, which is advantageously designed as a counting camera, an image of the air gap 3 is recorded. The camera 4 is connected to an evaluation device (not shown) which, by counting the pixels of the image of the air gap 3, determines the width of the air gap. Provision is advantageously made for it to be possible to calibrate the evaluation device.
The illumination of the air gap with lasers or a light source is optional. In addition to th~= embodiment illustrated, in which the air gap is irradiated from the side on which the camera is also arranged, a transmitted light method is also pos~;ible as an alternative. In this case, the air gap is irradiated by a light source from the other side. In this way, the image of the air gap is brighter than the image of the stator 1 and the rotor 2.
If an additional light source is dispensed with, then it is particularly advantageous to record and to evaluate an infrared image of the air ga~~ 3 with the camera 4. As a result of the heating of stator 1 and - 3a -rotor 2 during the operation of the electric motor, particularly good contrast relating to the air gap 3 is produced in this way.
In an advantageous way, as FIG 1 illustrates, two lines are produced with laser light, which then coincide with one another when the camera 4 is at a specific distance from the air gap 3. In this way, the distance of the camera 4 from the air gap 3 can be set particularly precisely.
FIG 2 shows a cross section through an annular motor, in this case reference symbol 1 designates the stator and reference symbol 2 designates the rotor of the annular motor. Reference symbol 3 designates the air gap between stator 1 and rotor 2. A winding shield 7 is provided for protection against the rotating rotor 2.
In this case, the camera 4 is particularly advantageously arranged on the side of the winding shield 7 facing the rotor 2.
Claims (6)
1. A device for determining the width of the air gap (3) between rotor (2) and stator (1) of a rotating electric machine, in particular an annular motor, characterized in that the device for determining the width of the air gap (3) comprises a camera (4) to record an image and a light source to irradiate the air gap (3) of the air gap (3), the camera (4) and the light source being constructed on a common axis, the common axis being arranged parallel to the axis of the rotating electric machine.
2. The device as claimed in claim 1, characterized in that it comprises an evaluation device to evaluate the image of the air gap (3) recorded by means of the camera (4).
3. The device as claimed in claim 2, characterized in that the evaluation device is designed to determine the width of the air gap (3) by counting pixels in the image of the air gap (3) recorded by means of the camera (4).
4. The device as claimed in claim 1, 2 or 3, characterized in that the camera (4) is designed as a line-scan camera.
5. The device as claimed in claim 1, 2, 3 or 4, characterized in that the light source is a laser.
6. A method of determining the width of the air gap (3) between rotor (2) and stator (1) of a rotating electric machine, in particular an annular motor, in particular by means of a device as claimed in one of the preceding claims, characterized in that the width of the air gap (3) is recorded by means of a camera (4), and the air gap (3) is irradiated by means of a light source, which is aligned on a common axis with the camera (4), and the common axis is arranged parallel to the axis of the rotating electric machine.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1999132911 DE19932911A1 (en) | 1999-07-14 | 1999-07-14 | Method and device for determining the width of the air gap between the rotor and stator of a rotating electrical machine, in particular a ring motor |
| DE19932911.7 | 1999-07-14 | ||
| PCT/DE2000/002261 WO2001006622A1 (en) | 1999-07-14 | 2000-07-12 | Method and device for determining the width of a gap between a rotor and a stator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2379150A1 true CA2379150A1 (en) | 2001-01-25 |
Family
ID=7914752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002379150A Abandoned CA2379150A1 (en) | 1999-07-14 | 2000-07-12 | Method and device for determining the width of the air gap between rotor and stator of a rotating electric machine, in particular an annular mo tor |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1194996A1 (en) |
| AR (1) | AR024738A1 (en) |
| AU (1) | AU6683300A (en) |
| CA (1) | CA2379150A1 (en) |
| DE (1) | DE19932911A1 (en) |
| WO (1) | WO2001006622A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2469264C1 (en) * | 2011-07-08 | 2012-12-10 | Учреждение Российской Академии наук Институт теплофизики им. С.С. Кутателадзе Сибирского отделения РАН (ИТ СО РАН) | Laser device to measure air gap of electric machine |
| US8674566B2 (en) | 2009-04-24 | 2014-03-18 | Alstom Renewable Technologies | Electrical machine with a device for monitoring an air gap between a rotor and a stator |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10228515A1 (en) * | 2002-06-26 | 2004-01-22 | Zett-Mess-Technik Gmbh | Height measurement and probe system for use with workpieces has probe arms mounted on set of swiveling arms held on baseplate fastened to floor |
| DE102009037990A1 (en) * | 2009-08-20 | 2011-02-24 | Alstom Technology Ltd. | Electric machine e.g. asynchronous machine, has monitoring section extending in axial direction through air gap, where section monitors air gap for detecting change of geometry of rotor and/or penetration of foreign bodies into air gap |
| CN104266597A (en) * | 2014-07-03 | 2015-01-07 | 东莞市诺丽电子科技有限公司 | Linear motor air gap on-line monitoring system |
| JP6577833B2 (en) * | 2015-10-29 | 2019-09-18 | 株式会社神戸製鋼所 | Internal inspection device for kneading equipment |
| CN107328368A (en) * | 2017-06-30 | 2017-11-07 | 中机国际工程设计研究院有限责任公司 | Gap measurement device and method, the production line using this device between stator and rotor |
| DE102017212952A1 (en) * | 2017-07-27 | 2019-01-31 | Robert Bosch Gmbh | Method and device for error analysis of speed detection |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60152250A (en) * | 1984-01-19 | 1985-08-10 | Toshiba Corp | Air gap watching device in rotary electric machine |
| DE3435628A1 (en) * | 1984-09-28 | 1986-04-10 | Wolfgang Dr.-Ing. 3000 Hannover Zeggert | Device for the contact-free measurement of the air-gap width between the rotor and stator of electrical machines |
| DE3536374A1 (en) * | 1985-10-11 | 1987-04-16 | Siemens Ag | Transmitted-light method for measuring housings and components |
| DE3619412A1 (en) * | 1986-06-12 | 1987-12-17 | Hoesch Stahl Ag | METHOD AND DEVICE FOR ROLL GAP MEASUREMENT AND CONTROL |
| JPH01299403A (en) * | 1988-05-27 | 1989-12-04 | Toshiba Corp | Monitoring device of air gap of rotary electric machine |
| GB8919399D0 (en) * | 1989-08-25 | 1989-10-11 | Renold Power Transmission Limi | Method of and apparatus for measuring small gaps |
| EP0699889A3 (en) * | 1994-08-24 | 1996-12-04 | Eastman Kodak Co | Gap distance measuring apparatus and method |
| DE19512935A1 (en) * | 1995-04-06 | 1997-01-16 | Franz Koeder Gmbh Ferigungstec | Position recognition of part with bent, non-homogeneous surface e.g. for electric machine rotor |
-
1999
- 1999-07-14 DE DE1999132911 patent/DE19932911A1/en not_active Withdrawn
-
2000
- 2000-07-12 CA CA002379150A patent/CA2379150A1/en not_active Abandoned
- 2000-07-12 AU AU66833/00A patent/AU6683300A/en not_active Abandoned
- 2000-07-12 WO PCT/DE2000/002261 patent/WO2001006622A1/en not_active Application Discontinuation
- 2000-07-12 EP EP00954319A patent/EP1194996A1/en not_active Withdrawn
- 2000-07-14 AR ARP000103616 patent/AR024738A1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8674566B2 (en) | 2009-04-24 | 2014-03-18 | Alstom Renewable Technologies | Electrical machine with a device for monitoring an air gap between a rotor and a stator |
| RU2469264C1 (en) * | 2011-07-08 | 2012-12-10 | Учреждение Российской Академии наук Институт теплофизики им. С.С. Кутателадзе Сибирского отделения РАН (ИТ СО РАН) | Laser device to measure air gap of electric machine |
Also Published As
| Publication number | Publication date |
|---|---|
| AR024738A1 (en) | 2002-10-23 |
| WO2001006622A1 (en) | 2001-01-25 |
| DE19932911A1 (en) | 2001-01-25 |
| EP1194996A1 (en) | 2002-04-10 |
| AU6683300A (en) | 2001-02-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |