High efficiency linear motor and oil well lift device

• US 20080036305A1
• Filed: 08/14/2007
• Published: 02/14/2008
• Est. Priority Date: 08/14/2006
• Status: Abandoned Application

• Current Assignee: Davor Jack Raos
• Original Assignee: Davor Jack Raos
• Inventors: Raos, Davor Jack
• Application Number:
  US11/891,971
• Publication Number:
  US 20080036305A1
• Time in Patent Office: Days
• US Class Current: 310/14
• CPC Class Codes: H02K 41/03 Synchronous motors; Motors moving step by step; Reluctance motors H02K41/035 takes precedence

Abstract

A high-efficiency permanent magnet linear motor optimized for low speed, high thrust applications, and a direct-drive oil well lift device powered by the motor. The motor comprises a high ratio of conductor volume to core cross-section area (14) and a plurality of individual, rectangular core-winding units (22) with a straight flux path through the cores (10) of the winding units.

Claims

1. A permanent magnet linear motor, the motor comprising:

a plurality of individual, rectangular core/winding units with non-overlapping windings.

2. The motor of claim 1 wherein said core/winding units have a length of 4 cm or longer.

3. A permanent magnet linear motor, the motor comprising:

a multi-toothed core; and

non-overlapping windings, wherein the length of the winding-covered part of each tooth is 4 cm or longer.

4. A permanent magnet linear motor, the motor comprising:

a plurality of individual core/winding units; and

non-overlapping windings, wherein each said core/winding unit has a ratio of conductor volume to core cross-section area in the range of 2;

1 to 3;

1.

5. The motor of claim 4 wherein said ratio is in the range of 3:

1 to 5;

1.

6. The motor of claim 4 wherein said ratio is in the range of 5:

1 to 12;

1.

7. The motor of claim 4 wherein said ratio is in the range of 12:

1 to 20;

1.

8. The motor of claim 4 wherein said ratio is in the range of 20:

1 or more.

9. A permanent magnet linear motor, the motor comprising:

a multi-toothed core; and

non-overlapping windings, wherein the ratio of the conductor volume of each winding to a corresponding tooth cross-section area is in the range of 2;

1 to 3;

1.

10. The motor of claim 9 wherein said ratio is in the range of 3:

1 to 5;

1.

11. The motor of claim 9 wherein said ratio is in the range of 5:

1 to 12;

1.

12. The motor of claim 9 wherein said ratio is in the range of 12:

1 to 20;

1.

13. The motor of claim 9 wherein said ratio is in the range of 20:

1 or more.

14. A device for directly actuating a rod of an oil well sucker rod pump assembly, the device comprising:

a permanent magnet linear motor, the motor including a plurality of individual, rectangular core/winding units; and

non-overlapping windings; and

a counterbalance.

15. The device of claim 14 wherein each said core/winding unit has a ratio of conductor volume to core cross-section area in the range of 2:

1 to 3;

1.

16. The device of claim 14 wherein each said core/winding unit has a ratio of conductor volume to core cross-section area in the range of 3:

1 to 5;

1.

17. The device of claim 14 wherein each said core/winding unit has a ratio of conductor volume to core cross-section area in the range of 5:

1 to 12;

1.

18. The device of claim 14 wherein each said core/winding unit has a ratio of conductor volume to core cross-section area in the range of 12:

1 to 20;

1.

19. The device of claim 14 wherein each said core/winding unit has a ratio of conductor volume to core cross-section area is 20:

1 or more.

20. The device of claim 14 wherein said linear motor comprises two columns of said core/winding units, and wherein said rod reciprocates in a space between said two columns.

21. A device for directly a rod of an oil well sucker rod pump assembly, the device comprising:

a multi-toothed core; and

non-overlapping windings, wherein the ratio of the conductor volume of each winding to a corresponding tooth cross-section area is in the range of 5;

1 or more; and

a counterbalance.