Motor stator assembly and full-circumferential flow pump employing such motor stator assembly

• US 5,648,694 A
• Filed: 10/13/1994
• Issued: 07/15/1997
• Est. Priority Date: 10/13/1993
• Status: Expired due to Fees

• Current Assignee: Ebara Corporation
• Original Assignee: Ebara Corporation
• Inventors: Kobayashi, Makoto, Yamamoto, Masakazu, Miyake, Yoshio
• Primary Examiner(s): Dougherty, Thomas M.
• Application Number:
  US08/322,425
• Time in Patent Office: 1,006 Days
• Field of Search: 310/87, 310/88, 310/89, 415/196, 417/423.14, 417/424.1
• US Class Current: 310/87
• CPC Class Codes: F04D 13/064 Details of the magnetic circuit
• CPC Class Codes: F04D 13/0686 Mechanical details of the pump control unit pump control F04D15/00
• CPC Class Codes: F04D 29/4266 made of sheet metal
• CPC Class Codes: H02K 5/12 specially adapted for operating in liquid or gas combined with cooling arrangements H02K9/00
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132

Abstract

A motor stator assembly is incorporated in a full-circumferential flow pump which has an annular space around a motor. The motor stator assembly comprises a stator, an outer frame casing encasing the stator, an outer cylinder made of sheet metal disposed around the outer frame casing with an annular space defined therebetween, and a cable housing hermetically welded to the outer frame casing and the outer cylinder, for housing leads of the stator. The outer cylinder can be elongated axially so as to cover the end portions of the motor frame.

Claims

1. A motor stator assembly for use in a full-circumferential flow pump comprising:

a stator;

an outer frame casing encasing said stator;

an outer cylinder made of sheet metal disposed around said outer frame casing with an annular space defined therebetween, liquid handled by said pump being introduced into said annular space; and

a cable housing for housing leads of said stator, said housing being hermetically welded to said outer frame casing and said outer cylinder;

wherein said cable housing has a receptacle-like body having an open end and a bottom, said open end is welded to said outer frame casing, and said bottom has a hole for taking out leads of said stator, said cable housing having a dimension larger than that of said hole in at least one direction within said annular space.

2. The motor stator assembly according to claim 1, wherein said outer cylinder has a hole into which said cable housing which has been welded to said outer frame casing is inserted from the inside of said outer cylinder, and said cable housing and said outer cylinder are welded together at said hole of said outer cylinder.

3. The motor stator assembly of claim 1 wherein said receptacle-like body comprises a terminal box for the leads of said stator.

4. A motor stator assembly for use in a full-circumferential flow pump comprising:

a stator;

an outer frame casing encasing said stator;

an outer cylinder made of sheet metal disposed around said outer frame casing with an annular space defined therebetween, liquid handled by said pump being introduced into said annular space; and

a cable housing for housing leads of said stator, said housing being hermetically welded to said outer frame casing and said outer cylinder;

wherein said cable housing has a receptacle-like body having an open end and a bottom, and said bottom has a lead hole for taking out leads of said stator and is welded to said outer frame casing through said lead hole, said cable housing having a dimension larger than that of said hole in at least one direction within said annular space.

5. The motor stator assembly according to claim 4, wherein said outer cylinder has a hole into which said cable housing is inserted from the outside of said outer cylinder.

6. The motor stator assembly according to claim 4, wherein said outer cylinder is formed by winding a flat plate and connecting a winding starting end and a winding terminating end together.

7. The motor stator assembly of claim 4 wherein said receptacle-like body comprises a terminal box for the leads of said stator.

8. The motor stator assembly according to claim 4, wherein said cable housing has an oblong cross section which is long in an axial direction of said outer frame casing and short in a circumferential direction of said outer frame casing.

9. The motor stator assembly according to claim 4, further comprising stays for connecting said outer frame casing and said outer cylinder.

10. A motor stator assembly for use in a full-circumferential flow pump comprising:

a stator;

an outer frame casing encasing said stator;

projections provided on said outer frame casing and projecting radially outwardly; and

an outer cylinder made of sheet metal disposed around said outer frame casing with an annular space defined therebetween, said outer cylinder being formed by winding sheet metal so as to surround said projections, and liquid handled by said pump being introduced into said annular space, wherein one of said projections comprises a cable housing for housing leads of said stator, and wherein said cable housing has a receptacle-like body with a lead hole for taking out leads of said stator, said cable housing having a dimension larger than that of said hole in at least one direction within said annular space.

11. The motor stator assembly according to claim 10, further comprising fixing means provided on axial ends of said outer cylinder, for fixing pump components to said axial ends of said outer cylinder.

12. The motor stator assembly according to claim 10, wherein said cable housing is located between a winding starting end and a winding terminating end.

13. A motor stator assembly comprising:

a stator;

an outer frame casing encasing said stator;

projections provided on said outer frame casing and projecting radially outwardly; and

an outer cylinder made of sheet metal disposed around said outer frame casing with an annular space defined therebetween, said outer cylinder being formed by two annular members each having a notch at one end thereof, said one of said projections is fitted in said notches of said annular members.

14. The motor stator assembly according to claim 13, wherein one of said projections comprises a cable housing for housing leads of said stator.

15. The motor stator assembly according to claim 13, wherein one of said projections comprises a stay which is located at a position where said two annular members are connected together.