METHOD FOR MANUFACTURING THE FRAME OF AN ELECTRIC MACHINE, AN ELECTRIC MACHINE AND A FRAME OF AN ELECTRIC MACHINE

• US 20110037353A1
• Filed: 04/07/2009
• Published: 02/17/2011
• Est. Priority Date: 04/18/2008
• Status: Abandoned Application

• Current Assignee: Randax Oy
• Original Assignee: Randax Oy
• Inventors: Rantapaa, Matti
• Application Number:
  US12/988,476
• Publication Number:
  US 20110037353A1
• Time in Patent Office: Days
• US Class Current: 310/60.A
• CPC Class Codes: H02K 5/163 radially supporting the rotary shaft at only one end of the rotor H02K5/165, H02K5/167, H02K5/173 take precedence
• CPC Class Codes: H02K 5/18 with ribs or fins for improving heat transfer
• CPC Class Codes: H02K 5/207 with openings in the casing specially adapted for ambient air
• CPC Class Codes: H02K 9/14 wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

A method for manufacturing the frame of an electric machine in which stator is formed, a first sheath of sheet metal is formed around and attached to a stator by laser welding and a cooling element is attached to the first sheath by laser welding. The electric machine includes at least a frame, a stator attached to the frame, an axis, a rotor attached to the axis and the front flange to which a bearing casing has been fitted in order to fit the bearing used to support the axis. The bearing casing has been fitted into the front flange in such a manner that the bearing can be placed into the bearing casing from inside the frame. In addition, the disclosure relates to the frame of an electric machine.

Claims

1. A method for manufacturing the frame (1) of an electric machine (9) in which method

a stator (8) is formed,

the first sheath (91) is formed around the stator (8),

a cooling element (93) is formed of sheet metal which element is attached to the first sheath (91)

characterized in that, in addition,

the first sheath (91) is formed of sheet metal and it is attached to the stator (8),

the second sheath (94) formed of sheet metal is attached to the cooling element (93).

2. The method according to claim 1, characterized in that the cooling element (93) is formed of sheet metal by corrugating.

3. The method according to claim 1 or 2, characterized in that the first sheath (91) and the second flange (94) is attached to the cooling element (93) by laser welding.

4. The method according to any of the preceding claims, characterized in that a front flange (3) is also formed to the frame (9) and a bearing casing (11) is formed in connection with the front flange, in which casing can be provided a bearing (10) from inside the frame.

5. The electric machine comprises at least a frame (9), a stator (8) attached to the frame, an axis (6), a rotor (7) attached to the axis and in addition, the electric machine comprises the first sheath (91) surrounding the stator (8) and a cooling element (93) attached to the first sheath (91),

characterized in that the electric machine comprises a second sheath (94) attached to the cooling element (93), and in addition, the first sheath (91), the second sheath (94) as well as the cooling element (93) are formed of sheet metal.

6. The electric machine according to claim 5, characterized in that the first flange (91) and the second flange (94) is attached to the cooling element (93) by laser welding.

7. The electric machine according to claim 5 or 6, characterized in that the electric machine comprises a front flange (3) of a frame (9), to which flange a bearing casing (11) has been arranged in order to fit bearings (10) supporting axis (6), and the bearing casing (11) has been arranged to the front flange (3) in such a way that the bearings (10) can be placed into the bearing casing from inside the frame (9).

8. The electric machine according to any of the preceding claims 5 to 7, characterized in that the rotor (7) is permanently magnetized.

9. An apparatus that comprises an electric machine (1) according to any of the preceding claims 5 to 8.

10. The apparatus according to claim 9, characterized in that the apparatus comprises a pump (2) which is attached to the front flange (3) of the electric machine (1) and to the axis (6).

11. The frame (9) of the electric machine, which frame comprises at least a stator (8), the first sheath (91) surrounding the stator, and the cooling element (93) attached to the first sheath (91), characterized in that the frame comprises the second sheath (94) attached to the cooling element (93), and in addition, the first sheath (91), the second sheath (94) as well as the cooling element (93) have been formed of sheet metal.

12. The frame of an electric machine according to claim 11, characterized in that the first sheath (91) and the second sheath (94) is attached to the cooling element (93) by laser welding.