WO2017114556A1 - Electric motor with improved heat dissipation and assemblage - Google Patents
Electric motor with improved heat dissipation and assemblage Download PDFInfo
- Publication number
- WO2017114556A1 WO2017114556A1 PCT/EP2015/081322 EP2015081322W WO2017114556A1 WO 2017114556 A1 WO2017114556 A1 WO 2017114556A1 EP 2015081322 W EP2015081322 W EP 2015081322W WO 2017114556 A1 WO2017114556 A1 WO 2017114556A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electric motor
- outer stator
- cylindrical casing
- cylindrical
- cylindrical core
- 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.)
- Ceased
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
Definitions
- the present invention relates to the casing of the electric motor.
- Electric motors are commonly known in the art. Electric motors can be used both in industrial applications and in domestic applications.
- Figures 1 to 5 show an electric motor (1’) which is known from the prior art.
- the electric motor (1’) comprises: an outer stator (2’) which includes a cylindrical core (3’) and a winding (4’) which is disposed onto the cylindrical core (3’); a shaft (not shown); an inner rotor (not shown) which is fixed to the shaft; a cylindrical casing (5’) which encloses the circumferential surface of the outer stator (2’); a front cap (not shown) and a rear cap (not shown) which cover the front aperture and the rear aperture of the cylindrical casing (5’) respectively.
- FIGS 4 to 5 show a production process of the electric motor (1’).
- the cylindrical casing (5’) is separately formed through die casting or injection moulding.
- the cylindrical casing (5’) is press-fitted onto the outer stator (2’).
- the cylindrical casing (5’) is fitted onto the outer stator (2’) through heat shrinking.
- the cylindrical casing (5’) is directly formed onto the outer stator (2’) through Aluminum injection molding.
- a common problem with the prior art electric motor (1’) is that the aforementioned production processes are complicated and cost intensive. Moreover the production processes are vulnerable to faults which cause a reduction in the heat dissipation and an increase in the vibration of the electric motor (1’) during the operation. For instance, in the heat shrinking process of the cylindrical casing (5’) and in the press-fitting process of the cylindrical casing (5’), the contact established between the casing (5’) and the outer stator (2’) may be poor, and thus the heat dissipation may become insufficient and also vibrations may occur during the operation.
- the outer stator (2’) may receive deformations during due to the high temperatures about 600 to 700 degrees Celsius, and thus the gap between the outer stator (2’) and the inner rotor may not be accurately adjusted and the performance of the electric motor (1’) may decrease.
- An objective of the present invention is to provide an electric motor which overcomes the problems of the prior art in a cost effective way and which enables an improved production and assemblage and an improved cooling performance.
- the electric motor of the present invention comprises a screw connection which is adapted for screwing the cylindrical core of the outer stator along the axial direction into the cylindrical casing without heat treatment.
- a major advantageous effect of the present invention is that the outer stator can be easily assembled with the cylindrical casing. Another major advantageous effect of the present invention is that the outer stator can be easily disassembled from the cylindrical casing. Another major advantageous effect of the present invention is that the contact between the cylindrical core and the cylindrical casing has been improved. Thereby, the heat can be more effectively dissipated into the environment and the motor performance can be increased. Thereby also the outer stator can be prevented from vibrating inside the cylindrical casing. Another major advantageous effect of the present invention is that the need for the heat shrinking process has been obviated. Another major advantageous effect of the present invention is that the need for the press fitting process has also been obviated. Another major advantageous effect of the present invention is that the need for reworking the gap between the outer stator and the inner rotor has been eliminated or reduced as much as possible. Thereby, the production costs can be reduced both in labor and material.
- the screw connection comprises a helical external thread and a helical internal thread which are respectively formed into the outer surface of the cylindrical core and the inner surface of the cylindrical casing.
- This embodiment is particularly advantageous as the outer stator and the cylindrical casing can be easily assembled with or dissembled from each other.
- This embodiment is also particularly advantageous as the contact between the cylindrical core and the cylindrical casing can be accurately adjusted through the strength of the screw connection. Thereby, the vibrations can be effectively eliminated. Thereby also the heat can be more effectively dissipated into the environment, and the performance of the electric motor can be increased.
- the helical external thread and the helical internal thread have matching rectangular shapes.
- a trapezoidal thread form, a triangular thread form or a round thread form may be alternatively used.
- Figure 1 - is a perspective view of an electric motor according to the prior art
- Figure 2 - is a perspective view of the cylindrical casing of the electric motor in Fig. 1;
- Figure 3 - is a perspective view of the outer stator of the electric motor in Fig. 1;
- Figure 4 - is a perspective view of the production process of the electric motor in Fig. 1, prior to press-fitting the cylindrical casing onto the outer stator;
- Figure 5 - is a perspective view of the production process of the electric motor in Fig. 1, after the cylindrical casing has been press-fitted onto the outer stator;
- Figure 6 - is a perspective view of an electric motor according to an embodiment of the present invention.
- Figures 7 to 8 - are perspective views of the production process of the electric motor in Fig. 6.
- the electric motor (1) comprises an outer stator (2) which includes a cylindrical core (3) and a winding (4) which is disposed onto the cylindrical core (3), a shaft (not shown), an inner rotor (not shown) which is fixed to the shaft, and a cylindrical casing (5) for enclosing the circumferential surface of the outer stator (2) (Fig. 6)
- the electric motor (1) of the present invention further comprises a screw connection (6) which is adapted for screwing the cylindrical core (3) of the outer stator (2) along the axial direction into the cylindrical casing (5) without heat treatment (Fig. 7 and Fig. 8)
- the screw connection (6) comprises a helical external thread (7) and a helical internal thread (8) for rotatably receiving the helical external thread (7).
- the helical external thread (7) is formed into the outer surface of the cylindrical core (3) and the helical internal thread (8) is formed into the inner surface of the cylindrical casing (3) (Fig. 7 and Fig. 8).
- a major advantageous effect of the present invention is that the outer stator (2) can be easily assembled with or disassembled from the cylindrical casing (5).
- Another major advantageous effect of the present invention is that the contact between the cylindrical core (3) and the cylindrical casing (5) has been improved. Thereby, the heat can be more effectively dissipated into the environment and the performance of the electric motor can be increased. Thereby also the outer stator (2) can be prevented from vibrating inside the cylindrical casing (5) during the operation.
- Other advantageous effects of the present invention can be taken from the above described embodiments.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The present invention relates to an electric motor (1) comprising an outer stator (2) which includes a cylindrical core (3) and a winding (4) which is disposed onto the cylindrical core (3), a shaft, an inner rotor which is fixed to the shaft and a cylindrical casing (5) for enclosing the circumferential surface of the outer stator (2). The electric motor (1) of the present invention further comprises a screw connection (6) which is adapted for screwing the cylindrical core (3) of the outer stator (2) along the axial direction into the cylindrical casing (5) without heat treatment.
Description
The present invention relates to the casing of the electric motor.
Electric motors are commonly known in the art. Electric motors can be used both in industrial applications and in domestic applications. Figures 1 to 5 show an electric motor (1’) which is known from the prior art. The electric motor (1’) comprises: an outer stator (2’) which includes a cylindrical core (3’) and a winding (4’) which is disposed onto the cylindrical core (3’); a shaft (not shown); an inner rotor (not shown) which is fixed to the shaft; a cylindrical casing (5’) which encloses the circumferential surface of the outer stator (2’); a front cap (not shown) and a rear cap (not shown) which cover the front aperture and the rear aperture of the cylindrical casing (5’) respectively. The front cap, the rear cap and the cylindrical casing (5’) protect the electric motor (1’) from the intrusion moisture and dirt, and further dissipate the heat into the environment. During the operation of the electric motor (1’) a large amount of heat is generated. Therefore, the electric motor (1’) must be sufficiently cooled through the cylindrical casing (5’). The heat dissipation is of utmost importance in view of the thermal protection of the electric motor (1’) and its performance. Figures 4 to 5 show a production process of the electric motor (1’). In this production process, the cylindrical casing (5’) is separately formed through die casting or injection moulding. Next, the cylindrical casing (5’) is press-fitted onto the outer stator (2’). In an alternative production process (not shown), the cylindrical casing (5’) is fitted onto the outer stator (2’) through heat shrinking. In another alternative production process (not shown), the cylindrical casing (5’) is directly formed onto the outer stator (2’) through Aluminum injection molding.
US 2014/0117797A1 discloses an electric motor.
A common problem with the prior art electric motor (1’) is that the aforementioned production processes are complicated and cost intensive. Moreover the production processes are vulnerable to faults which cause a reduction in the heat dissipation and an increase in the vibration of the electric motor (1’) during the operation. For instance, in the heat shrinking process of the cylindrical casing (5’) and in the press-fitting process of the cylindrical casing (5’), the contact established between the casing (5’) and the outer stator (2’) may be poor, and thus the heat dissipation may become insufficient and also vibrations may occur during the operation. In contrast thereto, in the Aluminum injection molding of the cylindrical cylindrical casing (5’), the outer stator (2’) may receive deformations during due to the high temperatures about 600 to 700 degrees Celsius, and thus the gap between the outer stator (2’) and the inner rotor may not be accurately adjusted and the performance of the electric motor (1’) may decrease.
An objective of the present invention is to provide an electric motor which overcomes the problems of the prior art in a cost effective way and which enables an improved production and assemblage and an improved cooling performance.
This objective has been achieved by the electric motor as defined in claim 1. Further achievements have been attained by the subject-matters respectively defined in the dependent claims.
The electric motor of the present invention comprises a screw connection which is adapted for screwing the cylindrical core of the outer stator along the axial direction into the cylindrical casing without heat treatment.
A major advantageous effect of the present invention is that the outer stator can be easily assembled with the cylindrical casing. Another major advantageous effect of the present invention is that the outer stator can be easily disassembled from the cylindrical casing. Another major advantageous effect of the present invention is that the contact between the cylindrical core and the cylindrical casing has been improved. Thereby, the heat can be more effectively dissipated into the environment and the motor performance can be increased. Thereby also the outer stator can be prevented from vibrating inside the cylindrical casing. Another major advantageous effect of the present invention is that the need for the heat shrinking process has been obviated. Another major advantageous effect of the present invention is that the need for the press fitting process has also been obviated. Another major advantageous effect of the present invention is that the need for reworking the gap between the outer stator and the inner rotor has been eliminated or reduced as much as possible. Thereby, the production costs can be reduced both in labor and material.
In an embodiment, the screw connection comprises a helical external thread and a helical internal thread which are respectively formed into the outer surface of the cylindrical core and the inner surface of the cylindrical casing. This embodiment is particularly advantageous as the outer stator and the cylindrical casing can be easily assembled with or dissembled from each other. This embodiment is also particularly advantageous as the contact between the cylindrical core and the cylindrical casing can be accurately adjusted through the strength of the screw connection. Thereby, the vibrations can be effectively eliminated. Thereby also the heat can be more effectively dissipated into the environment, and the performance of the electric motor can be increased.
In another embodiment, the helical external thread and the helical internal thread have matching rectangular shapes. A trapezoidal thread form, a triangular thread form or a round thread form may be alternatively used. These embodiments are particularly advantageous as the contact surface between the cylindrical core and the cylindrical casing can be increased, and thus the heat transfer can be improved.
Additional features and additional advantageous effects of the electric motor of the present invention will become more apparent with the detailed description of the embodiments with reference to the accompanying drawings in which:
Figure 1 - is a perspective view of an electric motor according to the prior art;
Figure 2 - is a perspective view of the cylindrical casing of the electric motor in Fig. 1;
Figure 3 - is a perspective view of the outer stator of the electric motor in Fig. 1;
Figure 4 - is a perspective view of the production process of the electric motor in Fig. 1, prior to press-fitting the cylindrical casing onto the outer stator;
Figure 5 - is a perspective view of the production process of the electric motor in Fig. 1, after the cylindrical casing has been press-fitted onto the outer stator;
Figure 6 - is a perspective view of an electric motor according to an embodiment of the present invention;
Figures 7 to 8 - are perspective views of the production process of the electric motor in Fig. 6.
The reference signs appearing on the drawings relate to the following technical features.
- Electric motor
- Outer stator
- Cylindrical core
- Winding
- Cylindrical casing
- Screw connection
- Helical external thread
- Helical internal thread
The electric motor (1) comprises an outer stator (2) which includes a cylindrical core (3) and a winding (4) which is disposed onto the cylindrical core (3), a shaft (not shown), an inner rotor (not shown) which is fixed to the shaft, and a cylindrical casing (5) for enclosing the circumferential surface of the outer stator (2) (Fig. 6)
The electric motor (1) of the present invention further comprises a screw connection (6) which is adapted for screwing the cylindrical core (3) of the outer stator (2) along the axial direction into the cylindrical casing (5) without heat treatment (Fig. 7 and Fig. 8)
In an embodiment, the screw connection (6) comprises a helical external thread (7) and a helical internal thread (8) for rotatably receiving the helical external thread (7). In this embodiment, the helical external thread (7) is formed into the outer surface of the cylindrical core (3) and the helical internal thread (8) is formed into the inner surface of the cylindrical casing (3) (Fig. 7 and Fig. 8).
A major advantageous effect of the present invention is that the outer stator (2) can be easily assembled with or disassembled from the cylindrical casing (5). Another major advantageous effect of the present invention is that the contact between the cylindrical core (3) and the cylindrical casing (5) has been improved. Thereby, the heat can be more effectively dissipated into the environment and the performance of the electric motor can be increased. Thereby also the outer stator (2) can be prevented from vibrating inside the cylindrical casing (5) during the operation. Other advantageous effects of the present invention can be taken from the above described embodiments.
Claims (2)
- An electric motor (1) comprising an outer stator (2) which includes a cylindrical core (3) and a winding (4) which is disposed onto the cylindrical core (3), a shaft, an inner rotor which is fixed to the shaft and a cylindrical casing (5) for enclosing the circumferential surface of the outer stator (2), characterized in that a screw connection (6) which is adapted for screwing the cylindrical core (3) of the outer stator (2) along the axial direction into the cylindrical casing (5) without heat treatment.
- The electric motor (1) according to claim 1, characterized in that the screw connection (6) comprises a helical external thread (7) and a helical internal thread (8) for rotatably receiving the helical external thread (7), wherein the helical external thread (7) is formed into the outer surface of the cylindrical core (3), and wherein the helical internal thread (8) is formed into the inner surface of the cylindrical casing (3).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2015/081322 WO2017114556A1 (en) | 2015-12-29 | 2015-12-29 | Electric motor with improved heat dissipation and assemblage |
| TR2016/16483A TR201616483A2 (en) | 2015-12-29 | 2016-11-15 | HEAT EXTENSION AND MOUNTED ELECTRIC MOTOR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2015/081322 WO2017114556A1 (en) | 2015-12-29 | 2015-12-29 | Electric motor with improved heat dissipation and assemblage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2017114556A1 true WO2017114556A1 (en) | 2017-07-06 |
Family
ID=55066630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2015/081322 Ceased WO2017114556A1 (en) | 2015-12-29 | 2015-12-29 | Electric motor with improved heat dissipation and assemblage |
Country Status (2)
| Country | Link |
|---|---|
| TR (1) | TR201616483A2 (en) |
| WO (1) | WO2017114556A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865385A (en) * | 2021-01-22 | 2021-05-28 | 珠海格力电器股份有限公司 | Heat radiation structure and motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2014802A (en) * | 1978-02-09 | 1979-08-30 | Multimotors System Ital | Case structure for rotary machines |
| DE102006049117A1 (en) * | 2006-10-18 | 2008-04-24 | Siemens Ag | Actuator assembling method for motor vehicle, involves screwing bearing shield provided with external thread in internal thread of crankcase, and inserting O-ring in axial direction into crankcase before screwing bearing shield |
| JP2014109204A (en) * | 2012-11-30 | 2014-06-12 | Daikin Ind Ltd | Compressor |
-
2015
- 2015-12-29 WO PCT/EP2015/081322 patent/WO2017114556A1/en not_active Ceased
-
2016
- 2016-11-15 TR TR2016/16483A patent/TR201616483A2/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2014802A (en) * | 1978-02-09 | 1979-08-30 | Multimotors System Ital | Case structure for rotary machines |
| DE102006049117A1 (en) * | 2006-10-18 | 2008-04-24 | Siemens Ag | Actuator assembling method for motor vehicle, involves screwing bearing shield provided with external thread in internal thread of crankcase, and inserting O-ring in axial direction into crankcase before screwing bearing shield |
| JP2014109204A (en) * | 2012-11-30 | 2014-06-12 | Daikin Ind Ltd | Compressor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865385A (en) * | 2021-01-22 | 2021-05-28 | 珠海格力电器股份有限公司 | Heat radiation structure and motor |
Also Published As
| Publication number | Publication date |
|---|---|
| TR201616483A2 (en) | 2017-07-21 |
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