GB2139011A - Asynchronous motor with two rotors - Google Patents
Asynchronous motor with two rotors Download PDFInfo
- Publication number
- GB2139011A GB2139011A GB08310424A GB8310424A GB2139011A GB 2139011 A GB2139011 A GB 2139011A GB 08310424 A GB08310424 A GB 08310424A GB 8310424 A GB8310424 A GB 8310424A GB 2139011 A GB2139011 A GB 2139011A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotor
- housing
- order
- electric motor
- end plate
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
- H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
An asynchronous electric motor comprises a housing 12, a stator 1 arranged in the housing 12, first and second end plates 4,8 arranged in the housing to mount the rotor, a two-part rotor 2,3 arranged in the housing to co-operate with the stator 1 and a ventilating fan 10 arranged to be driven by the rotor 2,3 in order to cause cooling air to pass through the housing 12. The first part 2 of the rotor comprises a short-circuited laminated rotor part which is coupled with an output shaft 14 in order to form the driving part of the rotor, the output shaft being mounted in the first end plate 4. The second part 3 of the rotor comprises a body of ferromagnetic material which is coupled with a fan shaft 13 in order to drive the ventilating fan 10, the fan shaft being mounted in the second end plate 8. The first and second rotor parts 2,3 are coupled together so that (a) they support each other in order to complete the rotatable mounting in the housing 12 of each of the rotor parts 2,3 and (b) they permit independent rotation of each rotor part. <IMAGE>
Description
SPECIFICATION
An asynchronous electric motor having a controllable speed of rotation
This invention relates to an asynchronous electric motor having a controllable speed of rotation.
It is known to provide an asynchronous electric motor with a controllable speed of rotation over a wide range. The electric motor has three rotors arranged within the stator, namely a main laminated short-circuited rotor, a hollow non-magnetic rotor rigidly fixed to a shaft of the main rotor, and a laminated short-circuited rotor having an independent bearing support and intended to drive a ventilating fan mounted on an output shaft of the ventilating rotor. The ventilating rotor is arranged inside the hollow rotor. The shaft of the ventilating rotor is hollow, and the shaft of the main rotor easily passes through it. Fixing of the main rotor is carried out by means of a bearing in a front bearing plate and an outer bearing situated in a cover of the ventilating fan.The fixing of the ventilating rotor is provided by a bearing arranged in a back bearing plate and by an inner bearing placed in the cover of the ventilating fan, the cover being fixed to the body of the stator. The ventilating fan of the electric motor is mounted behind the back bearing plate and is covered by the cover attached to the body of the stator.
The disadvantage of the known electric motor construction described above lies in its complicated structure, and the increased air space required between the ventilating rotor and the stator, causing an increased consumption of active materials and energy.
The present invention has been developed primarily, though not exclusively, with a view to provide an asynchronous electric motor with a controllable speed of rotation, having a simplified construction and a lower consumption of active materials and energy.
According to the invention there is provided an asynchronous electric motor having a controllable speed of rotation and comprising:
a housing;
a stator arranged in the housing;
first and second end plates arranged in the housing to mount a rotor;
a two-part rotor arranged in the housing to co-operate with the stator and comprising first and second parts mounted rotatably in the first and second end plates respectively;
and a ventilating fan arranged to be driven by the rotor in order to cause cooling air to pass through the housing; in which:
the first part of the rotor comprises a shortcircuited laminated rotor part which is coupled with an output shaft in order to form the driving part of the rotor, the output shaft being mounted in the first end plate in order to provide support for an end of the first rotor part which faces the first end plate;
the second part of the rotor comprises a body of ferromagnetic material which is coupled with a fan shaft in order to drive the ventilating fan, the fan shaft being mounted in the second end plate in order to provide support for an end of the second part of the rotor which faces the second end plate;;
and the facing ends of the first and second rotor parts are relatively rotatively coupled together in such a way that (a) they provide mutual support for each other in order to complete the rotatable mounting in the housing of each of the rotor parts and (b) they permit independent rotation of each rotor part.
An embodiment of electric motor according to the invention may be constructed having the advantages of (a) simplified construction, (b) easier mounting in position of the two parts of the rotor in the end plates of the housing, and (c) smaller consumption of active materials and energy.
One embodiment of the invention will now be described in more detail, by way of example only, with reference to the accompanying diagrammatic cross-sectional illustration.
Referring to the drawing, there is dislosed an asynchronous electric motor having a controllable speed of rotation and comprising a housing 12, a stator 1 arranged in the housing 12, a first end plate 4 and a second end plate 8 arranged at opposite ends ofthe housing 12 in orderto mount a rotor of the motor.
The rotor is in two part form and is arrange in the housing 12 to co-operate with the stator 1, the rotor comprising a first rotor part 2 and a second rotor part 3 mounted rotatively in the first end plate 4 and the second end plate 8 respectively. The first rotor part 2 comprises a short circuited laminated rotor part which is coupled with an output shaft 14 in order to form the driving part of the rotor having increased rotor resistance. The output shaft 14 is mounted in the first end plate 4 by means of a bearing 5 in order to provide support for an end of the first rotor part 2 which faces the first end plate 4.The second rotor part 3 comprises a body of solid ferromagnetic material which is coupled with a fan shaft 13 in order to drive a ventilating fan 10, the fan shaft 13 being mounted in the second end plate 8 by means of a bearing 9 in order to provide supportfor an end of the second part 3 of the rotor which faces the second end plate 8.
The facing ends of the first and second rotor parts 2,3 are relatively rotatively coupled together in such a way that (a) they provide mutual support for each other in order to complete the rotatable mounting in the housing 12 of each of the rotor parts (in addition to the mounting provided by the arrangement of output shaft 14 in end plate 4 and fan shaft 13 in end plate 8) and (b) they permit independent rotation of each rotor part.
Thus, the facing end of the first rotor part 2 includes a projecting stub shaft 14a which is mounted in a pair of axially spaced bearings 6 and 7 provided in the second rotor part 3. The bearings 6 and 7 are provided by means of two protective discs.
A cover for the fan 10 comprises a shell 11 which is fixed to the body or housing 12 of the stator 1.
During operation of the asynchronous electric motor disclosed herein, magnetic flux created by the stator 1 passesthroughthefirstdriving rotor part 2 and the second ventilating rotor part 3. In view of the manner by which the facing ends of the first and second rotor parts 2, 3 are relatively rotatively coupled together, it is possible for the two rotor parts to rotate at different speeds. This may occur when the value of the electrical power supplied to the motor is altered in such a way as to maintain the load applied to, or required from the driving rotor part 2. The speed of rotation of the driving rotor part 2, at constant loading, will change within the whole range of control, determined by a change in the power supply, whereas the speed of rotation of the ventilating rotor part 3 will only change within a comparatively small range of speed. Accordingly, the ventilating rotor part 3 is able to drive the ventilating fan 10 at a speed which does not vary by very much, despite fluctuating operating conditions for the driving rotor part, whereby a satisfactory flow of cooling air can be delivered through the housing 12 in order to cool the parts of the electric motor.
The speed of rotation of the driving rotor part 2 may be changed also by change in the loading applied to the electric motor. The function of the ventilating rotor part 3 will still remain the same in such a case. Further, the satisfactory functioning of the ventilating rotor part 3 (and the fan 10 driven thereby) will take place throughout the entire range of control of the speed of rotation of the electric motor, the lowest limit of which range may be close to zero.
Claims (5)
1. An asynchronous electric motor having a controllable speed of rotation and comprising:
a housing;
a stator arranged in the housing;
first and second end plates arranged in the housing to mount a rotor;
a two-part rotor arranged in the housing to co-operate with the stator and comprising first and second parts mounted rotatably in the first and second end plates respectively;
and a ventilating fan arranged to be driven by the rotor in order to cause cooling air to pass through the housing; in which:
the first part of the rotor comprises a shortcircuited laminated rotor part which is coupled with an output shaft in order to form the driving part of the rotor, the output shaft being mounted in the first end plate in order to provide support for an end of the first rotor part which faces the first end plate;
the second part of the rotor comprises a body of ferromagnetic material which is coupled with a fan shaft in order to drive the ventilating fan, the fan shaft being mounted in the second end plate in order to provide support for an end of the second part of the rotor which faces the second end plate;;
and the facing ends of the first and second rotor parts are relatively rotatively coupled together in such a way that (a) they provide mutual support for each other in orderto complete the rotatable mounting in the housing of each of the rotor parts and (b) they permit independent rotation of each rotor part.
2. An electric motor according to claim 1, in which the facing end of the first rotor part is rotatably mounted in the facing end of the second rotor part.
3. An electric motor according to claim 2, in which a stub shaft projects from the facing end of the first rotor part and is mounted in a pair of axially spaced bearings provided in the second rotor part.
4. An electric motor according to any one of the preceding claims, including a cover surrounding the ventilating fan and fixed to the housing.
5. An electric motor according to claim 1 and substantially as hereinbefore described with reference to, and as shown in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08310424A GB2139011B (en) | 1983-04-18 | 1983-04-18 | Ansynchronous motor with two rotors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08310424A GB2139011B (en) | 1983-04-18 | 1983-04-18 | Ansynchronous motor with two rotors |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8310424D0 GB8310424D0 (en) | 1983-05-25 |
| GB2139011A true GB2139011A (en) | 1984-10-31 |
| GB2139011B GB2139011B (en) | 1986-06-11 |
Family
ID=10541253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08310424A Expired GB2139011B (en) | 1983-04-18 | 1983-04-18 | Ansynchronous motor with two rotors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2139011B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1109297A2 (en) * | 1999-12-16 | 2001-06-20 | Siemens Aktiengesellschaft | Fan cooled electric motor drive |
| WO2005078899A1 (en) * | 2004-02-06 | 2005-08-25 | Emerson Electric Co. | Compact dynamoelectric machine |
| WO2008028996A1 (en) * | 2006-09-07 | 2008-03-13 | Abb Oy | Arrangement for cooling an electrical machine |
| CN105490484A (en) * | 2016-01-22 | 2016-04-13 | 沈阳兴华航空电器有限责任公司 | Three-stage intermediate frequency asynchronous motor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110671346A (en) * | 2018-07-03 | 2020-01-10 | 广东威灵电机制造有限公司 | Fan blower |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB948013A (en) * | 1960-05-20 | 1964-01-29 | Siemens Ag | The ventilation of asynchronous electric motors |
-
1983
- 1983-04-18 GB GB08310424A patent/GB2139011B/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB948013A (en) * | 1960-05-20 | 1964-01-29 | Siemens Ag | The ventilation of asynchronous electric motors |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1109297A2 (en) * | 1999-12-16 | 2001-06-20 | Siemens Aktiengesellschaft | Fan cooled electric motor drive |
| EP1109297A3 (en) * | 1999-12-16 | 2001-11-21 | Siemens Aktiengesellschaft | Fan cooled electric motor drive |
| WO2005078899A1 (en) * | 2004-02-06 | 2005-08-25 | Emerson Electric Co. | Compact dynamoelectric machine |
| US7109626B2 (en) | 2004-02-06 | 2006-09-19 | Emerson Electric Co. | Compact dynamoelectric machine |
| WO2008028996A1 (en) * | 2006-09-07 | 2008-03-13 | Abb Oy | Arrangement for cooling an electrical machine |
| CN105490484A (en) * | 2016-01-22 | 2016-04-13 | 沈阳兴华航空电器有限责任公司 | Three-stage intermediate frequency asynchronous motor |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2139011B (en) | 1986-06-11 |
| GB8310424D0 (en) | 1983-05-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |