WO2012116618A1

WO2012116618A1 - Switched reluctance generator with c-shaped stator iron core

Info

Publication number: WO2012116618A1
Application number: PCT/CN2012/071589
Authority: WO
Inventors: 郑家伟; 薛向党
Original assignee: 香港理工大学
Priority date: 2011-02-28
Filing date: 2012-02-24
Publication date: 2012-09-07
Also published as: CN102651594A; CN102651594B

Abstract

A switched reluctance generator with a C-shaped stator iron core comprises a generator base (10). A plurality of stators (20) and rotors (30) is disposed on the generator base (10). The generator base comprises a rotation portion for fixing the rotors (30) and a fixation portion for fixing the stators (20). The stator (20) comprises a C-shaped stator iron core (21), a coil (23) is disposed on the C-shaped stator iron core (21), and at two ends of an opening of the C-shaped stator iron core (21) are stator poles (22). The rotor (30) comprises a rotor pole (31). The plurality of rotors (30), under the action of an external force, performs linear and rotary motion at the same time relative to the stator poles (22) of each stator (20) in sequence, so that the reluctance of the magnetic circuit is changed and an induced electromotive force is incurred in the coil. The C-shaped stator iron core (21) is adopted and the plurality of stators (20) and rotors (30) is disposed on the generator base (10), the rotor (30) can perform linear and rotary motion at the same time relative to the stator (22), and the rotor (30) is small to be easily driven, which is applicable to cases of electricity generation during low speed running. The whole structure is simple and reliable, the control is flexible, and the manufacturing costs are low.

Description

Switched reluctance generator with C-shaped stator core

Technical field

The present invention relates to a generator, and more particularly to a switched reluctance generator with a C-shaped stator core.

Background technique

Electrical energy is one of the most important energy sources in modern society. A generator is a mechanical device that converts other forms of energy into electrical energy. There are many forms of generators, including: DC generators, permanent magnet generators, asynchronous generators, doubly-fed generators, and so on. But its working principle is based on the law of electromagnetic induction and the law of electromagnetic force. Therefore, the general principle of its construction is to construct magnetic circuits and circuits that mutually electromagnetically sense with appropriate magnetically conductive and conductive materials to generate electromagnetic power for energy conversion purposes.

The generator is usually composed of a stator, a rotor, an end cover and a bearing, and the stator is composed of a stator core, a coil winding, a base, and other structural members that fix these portions. The rotor is composed of a rotor core (or magnetic pole), a winding, a retaining ring, a center ring, a slip ring, a fan, and a rotating shaft. The stator and the rotor of the generator are connected and assembled by the bearing and the end cover, so that the rotor can rotate in the stator to perform the movement of the cutting magnetic line, thereby generating an induced electromotive force, which is led out through the terminal and connected to the circuit, thereby generating an induced current.

However, all of the above-mentioned generators are difficult to output large power in a low-speed environment, and the structure is complicated, which is disadvantageous for operation and control.

Summary of the invention

The technical problem to be solved by the present invention is to provide a switched reluctance generator with a C-shaped stator core for the above-mentioned drawbacks of the prior art.

The technical solution adopted by the present invention to solve the technical problem thereof is:

Constructing a switched reluctance generator with a C-shaped stator core, comprising a base on which a plurality of stators and rotors are disposed, the base comprising a rotating portion for fixing the rotor and for fixing a fixing portion of the stator, wherein the stator includes a C-shaped stator core, a coil is disposed on the C-shaped stator core, a stator pole is formed at both ends of the C-shaped stator core opening, and the rotor includes a rotor pole A plurality of the rotors may simultaneously perform linear and rotational motions with respect to the stator poles of each stator under an external force, such that the magnetic resistance of the magnetic circuit changes and an induced electromotive force is generated in the coil.

The switched reluctance generator according to the present invention, wherein the rotating portion includes a bearing and a plurality of spokes of equal length that are emitted outwardly around the bearing, and the plurality of the rotors are respectively disposed in each of the An end portion of the spoke; the fixing portion includes an annular frame disposed at a periphery of the rotating portion, and the plurality of the stators are disposed on an inner side surface of the annular frame.

The switched reluctance generator according to the present invention, wherein the rotating portion includes a bearing and a ring frame connected to the bearing, and the plurality of the rotors are respectively disposed on an inner side surface of the ring frame; The portion includes a central shaft disposed within the annular frame and a plurality of equal length and fixed motion spokes emitted from the central axial direction, the plurality of the stators being respectively disposed at the ends of each of the spokes unit.

The switched reluctance generator according to the present invention, wherein the stator is disposed outside the housing, the rotor is disposed inside the housing, and each of the stators includes one of the C-shaped stator cores .

The switched reluctance generator according to the present invention, wherein the stator is disposed outside the housing, the rotor is disposed inside the housing, and each of the stators includes two of the C-shaped stators core.

The switched reluctance generator according to the present invention, wherein the stator is disposed inside the housing, the rotor is disposed outside the housing, and each of the stators includes one C-shaped stator core .

The switched reluctance generator according to the present invention, wherein the stator is disposed inside the housing, the rotor is disposed outside the housing, and each of the stators includes two of the C-shaped stators core.

In the switched reluctance generator of the present invention, the base is provided with N stators and K rotors; wherein N and K are integers that are not equal to or greater than 2.

The switched reluctance generator of the present invention, wherein the switched reluctance generator further comprises a phase converter circuit connected to the coil, the phase converter circuit comprising a first device connected in series and connected at both ends of the DC power supply And a second device, and a third device and a fourth device connected in series at both ends of the DC power source, the coil being connected at a connection point of the first device and the second device, and the third device and Between the connection points of the fourth device; wherein

In the motoring phase, the first device and the fourth device are turned on, and the second device and the third device are turned off;

In the holding phase, the second device and the fourth device are turned on, and the first device and the third device are turned off;

In the power generation phase, the second device and the third device are turned on, and the first device and the fourth device are turned off.

The switched reluctance generator of the present invention, wherein the switched reluctance generator further includes a control system, the control system includes a controller connected to the DC power source, and the controller is connected to the coil to be electrically The phase magnetizes the C-shaped stator core; the controller is coupled to the rotating portion to drive the rotating portion to drive the rotor to rotate; the control system further includes a position sensor for detecting the position of the rotor, The position sensor is coupled to the controller to transmit the rotor position signal to the controller.

The invention has the beneficial effects that: by adopting a C-shaped stator core, and a plurality of stators and rotors are arranged on the base, the rotor can be linearly and rotationally moved relative to the stator at the same time, and the rotor is small and relatively easy to be driven, which is suitable for use. In the case of low-speed operation of power generation, such as wind power generation, the overall structure is simple, reliable, and flexible, and the manufacturing cost is low and easy to implement. The plurality of rotors can be linearly moved relative to the stator to cut the magnetic lines of force while being driven by the external force, and can also rotate relative to the stator, and sequentially cut the magnetic lines of the plurality of stators, so that the induced electromotive force can be generated in the plurality of coils, thereby improving the power generation efficiency.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1a is a schematic structural view of a main part of a switched reluctance generator with a C-shaped stator core according to a preferred embodiment of the present invention;

1b is a schematic view showing the position distribution of a stator and a rotor in a switched reluctance generator with a C-shaped stator core in FIG. 1a;

2a is a schematic structural view 1 of a stator of a switched reluctance generator according to a preferred embodiment of the present invention;

2b is a second schematic structural view of a stator of a switched reluctance generator according to a preferred embodiment of the present invention;

2c is a third schematic structural view of a stator of a switched reluctance generator according to a preferred embodiment of the present invention;

3 is a schematic structural view 1 of a stator and a rotor of a switched reluctance generator according to a preferred embodiment of the present invention;

4 is a second schematic structural view of a stator and a rotor of a switched reluctance generator according to a preferred embodiment of the present invention;

5 is a schematic structural view 3 of a stator and a rotor of a switched reluctance generator according to a preferred embodiment of the present invention;

6 is a schematic structural view of a stator and a rotor of a switched reluctance generator according to a preferred embodiment of the present invention;

7 is a schematic diagram showing an ideal phase inductance curve of a switched reluctance generator in accordance with a preferred embodiment of the present invention;

8 is a first schematic diagram showing the relationship between the stator and rotor positions (maximum phase inductance) of the switched reluctance generator according to the preferred embodiment of the present invention;

9 is a second schematic diagram showing the relationship between the stator and the rotor position (minimum phase inductance) of the switched reluctance generator according to the preferred embodiment of the present invention;

10 is a schematic diagram of a phase converter circuit of a switched reluctance generator in accordance with a preferred embodiment of the present invention;

Figure 11a is a schematic view showing the electric state of a phase converter circuit of a switched reluctance generator according to a preferred embodiment of the present invention;

Figure 11b is a schematic view showing the state of the phase converter circuit of the switched reluctance generator of the preferred embodiment of the present invention;

Figure 11c is a schematic view showing the power generation state of the phase converter circuit of the switched reluctance generator according to the preferred embodiment of the present invention;

12 is a graph showing changes in phase inductance, phase current, and phase voltage of a phase converter circuit of a switched reluctance generator at various stages in accordance with a preferred embodiment of the present invention;

Figure 13 is a block diagram of a control system of a switched reluctance generator in accordance with a preferred embodiment of the present invention.

detailed description

The main part of the switched reluctance generator with a C-shaped stator core of the preferred embodiment of the present invention is shown in FIG. 1a and FIG. 1b, and includes a base 10 on which a plurality of stators 20 and rotors 30 are disposed. The base 10 includes a rotating portion for fixing the rotor 30 and a fixing portion for fixing the stator 20, and the number of the stators 20 is different from the number of the rotors 30, so that the rotor 30 is rotated relative to the stator 20 by a magnetic force. Wherein, as shown in FIGS. 2a, 2b and 2c, each of the stators 20 includes a C-shaped stator core 21, on which the energized coil 23 is disposed, and the coil 23 is wound around the C-shaped stator core 21. The position may be any position as shown in FIG. 2a, FIG. 2b or FIG. 2c, and the C-shaped stator core 21 is a non-permanent magnet material (such as a silicon steel sheet), and the C-shaped stator core 21 is magnetized after the coil 23 is energized. The magnetic field line 24 is shown by a broken line in Fig. 2a, Fig. 2b or Fig. 2c. At both ends of the opening of the C-shaped stator core 21 is a stator pole 22, and the rotor 30 includes a rotor pole 31, and the plurality of rotors 30 can simultaneously perform linear and rotational motions with respect to the stator poles 22 of each stator 20 under the action of an external force, so that the magnetic body The reluctance of the path changes and an induced electromotive force is generated in the coil 23.

In the switched reluctance generator of the present embodiment, the rotor 30 has a small structure and is relatively easy to be driven, and is suitable for use in low-speed operation of power generation, such as wind power generation. The plurality of rotors 30 can be linearly moved relative to the stator 20 to cut the magnetic lines of force 24 under the external force, and can also rotate relative to the stator 20 to sequentially cut the magnetic lines 24 of the plurality of stators 20, so that the induced electromotive force can be generated in the plurality of coils 23, Improve power generation efficiency. Moreover, the switched reluctance generator has a simple and reliable overall control structure, low manufacturing cost, and is easy to implement.

In a further embodiment, as shown in FIG. 1a, the rotating portion includes a bearing 12 that is rotatable under an external force, and a plurality of equal length spokes 13 that are emitted outwardly from the bearing 12, adjacent spokes 13 The arc angles between them are preferably set equal, and a plurality of rotors 30 are respectively disposed at the ends of each of the spokes 13. The fixing portion includes an annular frame 11 disposed at a periphery of the rotating portion, and the plurality of stators 20 are disposed on an inner side surface of the annular frame 11. That is, the rotor 30 is located inside and the stator 20 is located outside. Thus, the plurality of rotors 30 can be rotated in accordance with the rotation of the spokes 13, sequentially cutting the magnetic lines 24 of the stator 20, and generating induced electromotive forces in the coils 23 of the respective stators 20.

Accordingly, the structure of the stator 20 and the rotor 30 which are suitable for the structure of the base 10 in the above embodiment is as shown in Figs. 3 and 4. In Fig. 3, the stator 20 is disposed outside the frame 10, the rotor 30 is disposed inside the frame 10, and each of the stators 20 includes a C-shaped stator core 21. In FIG. 4, the stator 20 is disposed outside the frame 10, and the rotor 30 is disposed inside the frame 10. Each of the stators 20 includes two C-shaped stator cores 21, which can further add a stator in the switched reluctance generator. 20 and the number of rotors 30 further improve power generation efficiency.

Alternatively, in the above embodiment, the rotating portion of the base 10 includes a bearing and a ring frame connected to the bearing, and the plurality of rotors are respectively disposed on the inner side surface (not shown) of the ring frame. The fixing portion includes a central shaft disposed in the annular frame and a plurality of spokes of equal length and fixed motion emitted from the central axial direction, and the arc angles between adjacent spokes are preferably set to be equal, and the plurality of stators are respectively set At the end of each spoke. That is, the rotor is located outside and the stator is located inside. Thus, the plurality of rotors 30 can be rotated in accordance with the rotation of the ring frame, sequentially cutting the magnetic lines of force of the stator 20, and generating an induced electromotive force in the coils 23 of the respective stators 20.

Accordingly, the structure of the stator 20 and the rotor 30 which are suitable for the structure of the base 10 in the above embodiment is as shown in Figs. 5 and 6. In Fig. 5, the stator 20 is disposed inside the frame 10, the rotor 30 is disposed outside the frame 10, and each of the stators 20 includes a C-shaped stator core 21. In Fig. 6, the stator 20 is disposed inside the frame 10, and the rotor 30 is disposed outside the frame 10. Each of the stators 20 includes two C-shaped stator cores 21, which can further add a stator in the switched reluctance generator. 20 and the number of rotors 30 further improve power generation efficiency.

Preferably, in the above embodiments, N stators 20 and K rotors 30 are disposed on the base 10; wherein N and K are integers of unequal or equal to 2, so that the rotor 30 is rotated by the magnetic force. If the number of the stator 20 and the rotor 30 are equal, after the coil 23 is energized, the stator pole 22 sucks the rotor pole 31 and cannot rotate.

For example, as shown in FIG. 1a, 10 spokes 13 are provided on the bearing 12, the arc angles of the adjacent spokes 13 are equal, and a rotor 30 is respectively disposed at the end of each spoke 13 and equally spaced inside the annular ring 11. 8 stators 20, denoted as A, B, C, D, A', B', C', D' The positional distribution of the stator 20 and the rotor 30 is as shown in Fig. 1b. When the stator having two C-shaped stator cores 21 in Figs. 4 and 6 is employed, two rotors 30 are respectively provided at the ends of each of the spokes 13.

The ideal phase inductance in the switched reluctance generator is as shown in Fig. 7, where 0, θrp/2 and θ represent the position where the rotor 30 is located, as shown in Fig. 8, when the rotor 30 is at the θrp/2 degree position, the stator The pole 22 is aligned with the rotor pole 31; as shown in Fig. 9, when the rotor 30 is at the 0 degree position, the stator pole 22 is not aligned with the rotor pole 31. Meanwhile, FIG. 7 also shows a power generation process of one unit (one rotor 30 corresponding to one stator 20) of the switched reluctance generator, including an electric process when the position of the rotor 30 is from 0 degrees to θrp/2 degrees (excitation process) ), and rotor 30 from θrp/2 degrees to θ Power generation process when the position and phase inductance are reduced.

In each of the above embodiments, the switched reluctance generator further includes a phase converter circuit connected to the coil 23. As shown in FIG. 10, the phase converter circuit includes a first device K1 and a second connected in series to the DC power supply VDC. The device K2, and the third device K3 and the fourth device K4 connected in series at the two ends of the DC power source VDC, the coil 23 is connected at a connection point of the first device K1 and the second device K2, and the third device K3 and the fourth device K4 Between the connection points.

Wherein, as shown in FIG. 11a, in the motoring phase, the first device K1 and the fourth device K4 are turned on, and the second device K2 and the third device K3 are turned off; as shown in FIG. 11b, in the holding phase, the second device K2 and The fourth device K4 is turned on, and the first device K1 and the third device K3 are turned off; as shown in FIG. 11c, in the power generation phase, the second device K2 and the third device K3 are turned on, and the first device K1 and the fourth device K4 are turned off. .

The variation of the phase inductance, phase current and phase voltage of the phase converter circuit described above at various stages is shown in FIG. Wherein, the L curve represents the phase inductance, the V curve represents the phase voltage, and the i curve represents the phase current. The positive phase voltage and the positive phase current indicate that the switched reluctance generator draws current from the DC bus for electric power, and the negative voltage and forward current indicate that the switched reluctance generator outputs current to the DC bus.

In still further embodiments, as shown in FIG. 13, the switched reluctance generator further includes a control system 40 that includes a controller 41 coupled to the DC power source 50, the controller 41 being coupled to the coil 23 for operation in the electric phase The C-shaped stator core 21 is magnetized; the controller 41 is coupled to the rotating portion of the base 10 to drive the rotating portion to drive the rotor 30 to rotate; the control system 40 further includes a position sensor 42 for detecting the position of the rotor 30, the position sensor 42 and the control The device 41 is coupled to transmit a position signal of the rotor 30 to the controller 41. In Figure 13, C-core The SRG 43 includes the stator and rotor of the switched reluctance generator, or other components that need to be controlled by the controller 41.

The present invention adopts a C-shaped stator core 21, and a plurality of stators 20 and rotors 30 are disposed on the base 10, so that the rotor 30 can simultaneously perform linear and rotational motion with respect to the stator 20, and the rotor 30 is small and relatively easy to be driven. It is suitable for the case of low-speed operation of power generation, such as wind power generation, and the overall structure is simple and reliable, the control is flexible, the manufacturing cost is low, and it is easy to implement. The plurality of rotors can be linearly moved relative to the stator to cut the magnetic lines of force while being driven by the external force, and can also rotate relative to the stator, and sequentially cut the magnetic lines of the plurality of stators, so that the induced electromotive force can be generated in the plurality of coils, thereby improving the power generation efficiency.

It is to be understood that those skilled in the art will be able to make modifications and changes in accordance with the above description, and all such modifications and variations are intended to be included within the scope of the appended claims.

Claims

A switched reluctance generator with a C-shaped stator core, comprising a base (10), the base (10) is provided with a plurality of stators (20) and a rotor (30), the base (10) A rotating portion for fixing the rotor (30) and a fixing portion for fixing the stator (20), characterized in that the stator (20) includes a C-shaped stator core (21), the C shape The stator core (21) is provided with a coil (23), at both ends of the opening of the C-shaped stator core (21) is a stator pole (22), the rotor (30) comprising a rotor pole (31), a plurality of The rotor (30) can simultaneously perform linear and rotational motions with respect to the stator poles (22) of each stator (20) under the action of an external force, so that the magnetic resistance of the magnetic circuit (24) changes and is in the coil ( 23) produces an induced electromotive force.
A switched reluctance generator according to claim 1, wherein said rotating portion includes a bearing (12) and a plurality of equal length spokes (13) radiated outwardly around said bearing (12) a plurality of said rotors (30) are respectively disposed at ends of each of said spokes (13);

The fixing portion includes an annular frame (11) disposed at a periphery of the rotating portion, and a plurality of the stators (20) are disposed on an inner side surface of the annular frame (11).
A switched reluctance generator according to claim 1, wherein said rotating portion includes a bearing and an annular frame attached to said bearing, and said plurality of said rotors (30) are respectively disposed at said ring frame An inner side surface; the fixing portion includes a central shaft disposed in the annular frame; and a plurality of length-fixed and fixed spokes emitted from the central axial direction, the plurality of the stators (20) They are respectively disposed at the ends of each of the spokes.
The switched reluctance generator according to claim 2, wherein said stator (20) is disposed outside said housing (10), and said rotor (30) is disposed at said housing (10) The interior of each of said stators (20) includes one of said C-shaped stator cores (21).
The switched reluctance generator according to claim 2, wherein said stator (20) is disposed outside said housing (10), and said rotor (30) is disposed at said housing (10) The interior of each of the stators (20) includes two of the C-shaped stator cores (21).
The switched reluctance generator according to claim 3, wherein said stator (20) is disposed inside said housing (10), and said rotor (30) is disposed at said housing (10) The outer portion of each of the stators (20) includes one of the C-shaped stator cores (21).
The switched reluctance generator according to claim 3, wherein said stator (20) is disposed inside said housing (10), and said rotor (30) is disposed at said housing (10) The outer portion, each of the stators (20) includes two of the C-shaped stator cores (21).
The switched reluctance generator according to claim 1, wherein said base (10) is provided with N said stators (20) and K said rotors (30);

Wherein, N and K are integers that are not equal to or greater than 2.
A switched reluctance generator according to claim 1, wherein said switched reluctance generator further comprises a phase converter circuit connected to said coil (23), said phase converter circuit comprising a series connection and a connection a first device (K1) and a second device (K2) at both ends of the DC power source, and a third device (K3) and a fourth device (K4) connected in series at both ends of the DC power source, the coil (23) being connected Between the connection point of the first device (K1) and the second device (K2), and the connection point of the third device (K3) and the fourth device (K4);

In the motoring phase, the first device (K1) and the fourth device (K4) are turned on, and the second device (K2) and the third device (K3) are turned off;

In the holding phase, the second device (K2) and the fourth device (K4) are turned on, and the first device (K1) and the third device (K3) are turned off;

In the power generation phase, the second device (K2) and the third device (K3) are turned on, and the first device (K1) and the fourth device (K4) are turned off.
The switched reluctance generator of claim 1 wherein said switched reluctance generator further comprises a control system (40), said control system (40) comprising a controller coupled to the DC power source (50) ( 41) the controller (41) is coupled to the coil (23) to magnetize the C-shaped stator core (21) in an electric phase;

The controller (41) is coupled to the rotating portion to drive the rotating portion to drive the rotor (30) to rotate;

The control system further includes a position sensor (42) for detecting the position of the rotor, the position sensor (42) being coupled to the controller (41) to transmit the position signal of the rotor (30) to the Controller (41).