High phase order cycloconverting generator and drive means

• US 6,198,238 B1
• Filed: 12/07/1995
• Issued: 03/06/2001
• Est. Priority Date: 12/07/1995
• Status: Expired due to Term

• Current Assignee: Borealis Technical Limited (Borealis Exploration Ltd.)
• Original Assignee: Borealis Technical Limited (Borealis Exploration Ltd.)
• Inventors: Edelson, Jonathan S.
• Primary Examiner(s): Martin, David
• Application Number:
  US08/568,541
• Time in Patent Office: 1,916 Days
• Field of Search: 318/140-158, 318/798-811, 363/123-139, 363/157-178
• US Class Current: 318/148
• CPC Class Codes: H02K 19/26 characterised by the arrangement of exciting windings
• CPC Class Codes: H02K 19/34 Generators with two or more outputs
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: H02M 5/27 for conversion of frequency
• CPC Class Codes: H02P 2101/10 for water-driven turbines
• CPC Class Codes: H02P 2101/15 for wind-driven turbines
• CPC Class Codes: H02P 9/04 Control effected upon non-electric prime mover and dependent upon electric output value of the generator

Abstract

An electrical generator, consisting of a high phase order generator and a high phase order cycloconverter. Output from said cycloconverter may be high phase order, three phase, single phase, or direct current. Output from said cycloconverter may be of arbitrary frequency, voltage, and phase.

Power electronic components are smaller and more efficiently used. Slower and therefor less expensive devices may be beneficially used. Variable speed resources may be used without the use of a DC to DC converter, enhancing power production efficiency.

In a beneficial embodiment of the present invention, said cycloconverter is used to provide power directly to a high phase order motor, whereby diesel electric drive means may be constructed to higher specific power and higher efficiency.

Claims

1. An apparatus for the production of electrical power from mechanical power comprising:

(a) generator means for conversion of said mechanical power into a polyphase alternating current,

(b) cycloconverter means for conversion of said polyphase alternating current into desired output current, and

(c) suitable wiring means for electrical connection of said components,

said apparatus connected to an electrical load, the improvement wherein being said polyphase alternating current having four or more phases.

2. Apparatus described in claim 1 wherein said polyphase alternating current having four or more phases is a polyphase alternating current having twelve or more phases.

3. Apparatus described in claim 1 wherein said generator means is a synchronous generator, a stator winding of said synchronous generator being wound to provide four or more phases of said alternating current.

4. Apparatus described in claim 3 wherein said stator wound to provide four or more phases of said intermediate alternating current is a stator comprising full span concentrated windings arranged to provide twelve or more phases of alternating current.

5. Apparatus described in claim 1 wherein said generator means is an induction generator, a stator winding of said induction generator being wound to provide four or more phases of alternating current.

6. Apparatus described in claim 5 wherein said stator wound to provide four or more phases of intermediate alternating current is a stator comprising full span concentrated windings arranged to provide twelve or more phases of alternating current.

7. Apparatus described in claim 1 wherein said polyphase alternating current has a sinusoidal waveform.

8. Apparatus described in claim 1 wherein said polyphase alternating current has a non-sinusoidal waveform.

9. Apparatus described in claim 1 wherein said polyphase alternating current is described by equal phase angle between phases.

10. Apparatus described in claim 1 wherein said polyphase alternating current is described by equal phase angle between phases.

11. Apparatus described in claim 1 wherein said output current produced by said cycloconverter means is a single phase alternating current.

12. Apparatus described in claim 1 wherein said output current produced by said cycloconverter means is a direct current.

13. Apparatus described in claim 1 wherein said output current produced by said cycloconverter means is of a plurality of phases.

14. Apparatus described in claim 13 wherein said output current is of four or more phases.

15. Apparatus described in claim 14 wherein said output current having four or more phases is a current having twelve or more phases.

16. Apparatus described in claim 1 wherein said cycloconverter means contains slow power switching devices.

17. Apparatus described in claim 1 wherein said cycloconverter means contain said power switching devices operated so as to switch at zero crossing of input waveform, whereby entire cycles or half cycles of input current are switched to the output, and no current flows through the switch element during the switching operation.

18. Apparatus described in claim 1 wherein said mechanical power is of an irregular frequency.

19. Apparatus described in claim 18 wherein said load is a constant frequency load.

20. Apparatus described in claim 1 wherein rotor and stator of said generator means are composed of materials which are not ferromagnetic.

21. Apparatus described in claim 1 wherein said polyphase alternating current is of twelve or more phases.

22. An electric drive comprising:

(a) generator means for conversion of mechanical power into polyphase alternating current,

(b) cycloconverter means for conversion of said polyphase alternating current into desired motor drive current,

(c) electric motor means for conversion of said motor drive current into desired mechanical power, and

(d) suitable wiring means for electrical connection of said components,

said apparatus driven by said mechanical power,

said apparatus providing mechanical power to a mechanical load, the improvement wherein being said polyphase alternating current and said motor drive current having four or more phases.

23. Apparatus described in claim 22 wherein said polyphase alternating current having four or more phases is a polyphase alternating current having twelve or more phases.

24. Apparatus described in claim 22 wherein said motor drive current having four or more phases is a polyphase alternating current having twelve or more phases.

25. A method for producing an electrical output of controlled variable frequency and voltage, comprising:

a) driving a high phase number generator with suitable mechanical power, to generate a polyphase alternating current of four or more phases,

b) transferring said polyphase alternating current from said generator to a cycloconverter by suitable wiring means for carriage of electrical current,

c) converting said polyphase alternating current via said cycloconverter to produce said electrical output of arbitrary frequency and voltage, and

d) employing said electrical output for driving a load.

26. A method as in claim 25 wherein said load is a motor operating on four or more phases, said cycloconverter being suitable wired for the production of a suitable number of phases.