KR20030017956A - Low pressure ac motor generator - Google Patents

Abstract

PURPOSE: A low voltage AC motor generator is provided to achieve improved energy efficiency by utilizing the induced electrical energy generated during the operation of the motor, while allowing for stabilized rotation of the rotor. CONSTITUTION: A low voltage AC motor generator(100) comprises a rotor(10); a stator(20) having a rotor hole penetrating through the center of the stator such that the rotor is mounted in the rotor hole, a core having a plurality of slots formed along the circumference of the rotor hole, a motor coil(27) arranged in the slot of the core so as to receive power and rotate the rotor, and a generator coil(25) arranged in the slot of the core so as to lead out the electrical energy induced during the rotation of the rotor; and an insulator for insulation between the motor coil and the generator coil. The motor coil arranged in the slot of the core is thick, and has reduced turns.

Description

Low pressure alternator

The present invention relates to a low pressure AC motor generator that can extract and use induction electricity generated in the process of driving a low pressure AC motor.

Common generators include coils and magnets. First of all, the mechanical energy, for example, thermal power or hydraulic power, is used to rotate the magnet along the axis of rotation, so that the strength of the magnetic field received by the coil around the magnet is continuously changed so that the current is induced in the coil. A generator is a device that converts mechanical energy into electrical energy.

Electric motors, on the other hand, include coils and magnets just like generators. As the current flows through the coil, a magnetic field is generated by the current, which creates a force in the interaction with the original magnetic field, which rotates the shaft. In other words, the electric motor is a device that converts electrical energy into mechanical energy.

Electric motors are used in all devices and machines powered by electricity, from small to extra large, such as household fans, dryers, blenders, refrigerators, air conditioners, and all factory machines. The small one has a coil between the permanent magnets and this coil constitutes a rotating shaft. The medium-large type has a permanent magnet on the rotating shaft and is arranged to receive a continuous force by placing several coils around the magnet to rotate.

Therefore, the object of the present invention is that the electric energy supplied to the low-pressure motor is consumed as mechanical energy to rotate the rotor, while the electric motor is driven while paying attention to the fact that the induced electromotive force by magnetic induction is generated separately as the rotor rotates like a generator The present invention provides a low-voltage alternating-current motor generator in which a motor and a generator capable of extracting the generated induction electricity are integrated.

1 is a block diagram showing a low-pressure AC motor generator according to the present invention.

Figure 2 is a schematic circuit diagram showing an induction low voltage AC motor generator according to a first embodiment of the present invention.

3 is an exploded perspective view showing the inductive low-voltage AC motor generator of FIG.

FIG. 4 is a plan view illustrating a state in which a power winding and a power generation winding are in the slot of the stator of FIG. 3.

5 is a schematic circuit diagram showing a synchronous low voltage AC motor generator according to a second embodiment of the present invention.

FIG. 6 is an exploded perspective view showing the synchronous low pressure AC motor generator of FIG. 5. FIG.

FIG. 7 is a plan view illustrating a state in which a motor winding and a power generation winding are installed in the stator slot of FIG. 6.

8 to 10 are plan views showing a state in which a power winding and a power winding are installed in a slot of a stator according to another embodiment of the present invention.

Description of the main parts of the drawing

10, 110: rotor 13, 113: rotation axis

15, 115: stratified core 19, 119: cage winding

20, 120: stator 21, 121: rotor ball

23, 123: slot 24, 124: core

25, 65, 75, 85: Electric winding 26, 126: Insulated paper

27, 67, 77, 87: windings for power generation 30, 130: power supply

40, 140: power take-out 100, 200: low pressure AC motor generator

117: field stimulation 150: female period

In order to achieve the above object, by inserting the power generation winding together with the electric winding with a small number of turns in the slot of the stator with a small number of windings to obtain the power by rotating the rotor by the power supplied to the low voltage power winding, Provided is a low voltage alternating current motor generator capable of drawing electricity induced in a power generation winding by rotating around the power generation winding.

In a preferred embodiment of the present invention, it is preferable that the electric winding is first installed in the slot of the stator, and then the power winding is installed together in the slot in which the electric winding is installed. Insulation paper is interposed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a low pressure AC motor generator 100 according to the present invention. Referring to FIG. 1, the low pressure AC motor generator 100 according to the present invention includes a rotor 10, a stator 20, a power supply 30, and a power drawer 40. In the stator 20, the electric winding 25 and the power generation winding 27 are installed together, the electric winding 25 is connected to the power supply unit 30, and the power generation winding 27 is a power drawing unit ( 40). The power supply unit 30 supplies three-phase AC power, for example, and the power supply unit 40 draws three-phase AC power.

Therefore, the rotational magnetic field generated by the three-phase alternating current flowing through the stator's electric winding 25 and the rotational force generated by the interaction between the induced current generated in the rotor 10 by the rotating magnetic field are rotated. The electron 10 is rotated. In addition, as the rotor 10 rotates, the induced voltage is induced in the power generation winding 27 to draw a three-phase AC power to the power drawing unit 40.

That is, the low pressure AC motor generator 100 according to the present invention serves as an AC motor in that the low voltage power supplied from the power supply unit 30 is supplied to turn the rotor 10 to obtain power. 10 also serves as an alternator in that it generates electricity while rotating around the stator 20.

Referring to Figures 2 to 4 of the induction-type low-voltage AC motor generator 100 according to a specific embodiment of the present invention, the low-voltage AC motor generator 100 according to the first embodiment of the present invention is an induction motor In this case, in the low pressure AC motor generator 100 according to the first embodiment, power is connected only to the stator 20, and the rotor 10 operates by induction. do.

The rotor 10 has a cage winding 19 formed therein by inserting an uncoated rod or a casting of aluminum into the slot, which is not coated on the stratified iron core 15 compressed to the rotary shaft 13.

The stator 20 includes a plurality of steel plates in which a rotor hole 21 is formed through a center thereof and a plurality of slots 23 are formed around the rotor hole 21 so that the rotor 10 is installed at a predetermined interval therein. And a core 24 formed by insulating lamination along the axial direction of the rotor 10, and a winding 26 internally formed in the slot 23 of the core. The winding 26 includes an electric winding 25 and a power generating winding 27. The first insulating paper 28 is first installed in the slot 23 before the winding 26 is installed in the slot 23. Next, the electric winding 25 and the power generation winding 27 are internally installed. Of course, a second insulating paper 29 is interposed between the electric winding 25 and the electric power winding 27.

In the exemplary embodiment of the present invention, the electric winding 25 and the electric power generating winding 27 are installed together in the slot 23 of the core, and the electric winding 25 is first embedded in the core, and then the second insulating paper 29 is interposed therebetween. In one state, the power generation winding 27 is implied. That is, the power generation winding 27 is arranged near the rotor 10 as a center, and the electric winding 25 is arranged at the far side. The reason why the power generation winding 27 is arranged in front of the electric winding 25 in this way is that the closer the rotor 10 is, the stronger the induction electricity can be drawn from the rotor 10.

On the other hand, when the electric winding 25 and the power generation winding 27 are embedded in the slot 23 of the core, each phase of the three phases is not an example of one winding, and since at least some windings are used, the slot of the core is used. (23) Numbers are 24, 36, 48, 64, etc., many of which reach hundreds. The windings of each phase are arranged in 120 ° shifts in space. As the winding, a round copper wire having a diameter of 0.025 mm to 3.2 mm is generally used.

And, according to the method of connecting the winding 26 to the slot 23 of the core, it is possible to create a rotating magnetic field of 2 poles, 4 poles, 6 poles, 8 poles, 10 poles, 12 poles, the more poles of the rotating magnetic field The speed is slowed down, so the rotor rotates at low speed. As a method of connecting the windings 26, a star-connection (Y-connection) method and a delta-connection method are used.

For example, in the case where the electric winding 25 is connected to three-phase four poles, the power generation winding 27 may also be connected to three-phase four poles, but preferably more poles than the poles of the electric winding 25. It is preferable to connect with. Because, when the electric winding 25 and the power generation winding 27 are connected with the same pole, a lot of heat is generated in the process of driving the low-voltage AC motor generator 100, whereas the pole of the electric winding 25 Rather, it is possible to maximize the withdrawal of the three-phase withdrawal power while minimizing heat generated when the power generation windings 27 are connected to many poles.

On the other hand, it is obvious to those skilled in the art to form a variety of rotor magnetic field according to the method of connecting the winding 26 and the method of connecting the winding 26.

Referring to the operating state of the induction-type low-voltage AC motor generator 100 according to an embodiment of the present invention, when the low-voltage three-phase AC power supply to the motor winding 25 of the stator, a rotating magnetic field generated by the three-phase AC power And the rotational magnetic field are rotated by the rotational force generated by the interaction with the induced current generated in the rotor 10. In addition, the induced current induced in the power generation winding 27 by the rotation of the rotor 10 is drawn out to the power generation winding 27.

On the other hand, when single-phase electric power is required in the drawn three-phase AC power supply, only two lead wires out of three lead wires are used, and a neutral connection and only one lead wire is used in a molded connection. If you need two phases, you can switch from three phases to two phase windings.

Next, the synchronous low pressure AC motor generator 200 according to the second specific embodiment of the present invention will be described with reference to FIGS. 5 to 7. The low pressure AC motor generator 200 according to the embodiment of the present invention may be a synchronous motor. It has been improved to perform as a generator. At this time, the synchronous low voltage AC motor generator 200 according to the second embodiment has the same structure as the above-described induction AC motor generator, but the rotor 110 has a magnetic pole that is DC-excited.

Referring to FIG. 5, the low pressure AC motor generator 200 according to the present invention includes a rotor 110, a stator 120, a power supply unit 130, and a power extraction unit 140. The stator 120 has the electric winding 125 and the power generating winding 127 together, and the electric winding 125 is connected to the power supply 130, and the power winding 127 is a power drawing part ( 140). The power supply unit 130 supplies, for example, three-phase AC power, and the power drawing unit 140 draws out three-phase AC power.

Therefore, the rotating magnetic field generated by the three-phase alternating current flowing through the motor winding 125 of the stator and the rotating force generated by the interaction of the induced current generated in the rotor 110 by the rotating magnetic field Done. When the rotation speed reaches a point slightly lower than the synchronous speed, when the rotor 110 is DC-excited with DC power, a definite magnetic pole is generated on the rotor 110. When magnetic attraction is coupled between the magnetic pole generated in the rotor 110 and the rotary magnetic pole generated in the stator 120, the rotor 110 continues to rotate at the same speed as the magnetic field. In addition, since the magnetic field generated by the DC-excited rotor 110 cuts the power generation winding 127, an induced voltage is induced in the power generation winding 127, and the three-phase AC power supply is drawn out to the power drawing unit 140. do.

That is, the synchronous low voltage AC motor generator 200 according to the second embodiment performs the role of an AC motor in that the low voltage power supplied from the power supply unit 130 is supplied to turn the rotor 110 to obtain power. At the same time, the rotor 110 rotates around the stator 120 to generate electricity while also acting as an alternator.

6 and 7, the synchronous low pressure AC motor generator 200 according to the second embodiment will be described in more detail. The rotor 110 is not covered on the stratified core 115 pressed against the rotating shaft 113. As a cage-type rotor in which a cage winding or aluminum casting is put into a slot, a cage winding 119 is formed, and has a projecting field magnetic pole 117 similar to that of a DC motor. The field magnetic pole 117 is supplied with a DC power source and is DC-excited. For example, the field coils wound on the field poles 117 are connected in series so as to alternately have polarities, and lead out to the outside through a slip ring 112 mounted on the rotating shaft 113. The field stimulus 117 is excited by a DC power supplied by a small DC generator or a brushless exciter 150.

In the case of a conventional synchronous motor, a direct current generator is attached to the rotating shaft of the motor to excite the rotating magnetic field. On the other hand, in addition to the above-described squirrel rotor as the rotor 110, it may be implemented as a winding type rotor with a three-phase winding in the stratified core, or a rotor with a permanent magnet.

Since the stator 120 is the same as the stator structure of the induction type low-voltage AC motor generator according to the first embodiment described above, a detailed description thereof will be omitted.

Referring to the operation of the low-voltage AC motor generator 200 according to an embodiment of the present invention, when the low-pressure three-phase AC power supply to the motor winding 125 of the stator, a rotating magnetic field generated by the three-phase AC power, Power is obtained by rotating the rotor 110 with the rotational force generated by the interaction with the rotor 110, which is DC excited by the exciter 150. In addition, the induced current generated by the rotation of the DC-excited rotor 110 is drawn out to the power generation winding 127.

On the other hand, when single-phase electric power is required in the drawn three-phase AC power supply, only two lead wires out of three lead wires are used, and a neutral connection and only one lead wire is used in a molded connection. If two phases are required, the three phases can be converted into two phase windings.

In the first and second embodiments of the present invention, although the electric winding and the power generating winding are installed together in the slot of the stator, as shown in FIGS. 8 to 10, the electric winding and the power generating winding may be alternately installed. It may be. FIG. 8 shows a state in which a bundle of power generating windings 67 is alternately installed in the slot 23 in one bundle of the electric winding 65, and FIG. 9 shows power generation in two bundles of the electric windings 75. The two bundles of the windings 77 are shown in the slot 23 alternately, and FIG. 10 alternates the three sets of power windings 87 in the slot 23 alternately in the slot 23. It shows the state. At this time, a bundle of windings is impounded in one slot.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to aid understanding and are not intended to limit the scope of the present invention. In addition to the embodiments disclosed herein, it is apparent to those skilled in the art that other modifications based on the technical idea of the present invention may be implemented. For example, the embodiment of the present invention is a low-voltage alternating current motor generator of medium and large size, the electric winding and the power generation winding in the stator, the portion corresponding to the magnet constitutes a rotor, but in the case of a small size, the magnet is placed on the stator A low-voltage AC motor generator may be implemented by installing an electric winding and a power winding in the rotor. At this time, electricity may be drawn out through the power generation winding in the rotor.

Therefore, according to the structure of the present invention, by inserting the power generation winding together with the electric winding with a low number of windings in the slot of the stator, the rotor is obtained by rotating the rotor with a low voltage power supplied to the electric winding, and the rotation By rotating around the self-winding winding to draw the electricity that is led to the power-winding winding, it is possible to increase the energy efficiency.

In addition, by drawing the induction electricity generated in the rotor that can act as a vortex through the power generation winding, there is an advantage that can induce a stable rotation of the rotor.

Claims (8)

With a rotor; The rotor ball is formed through the center so that the rotor is installed at a predetermined interval therein, a core having a plurality of slots formed around the rotor ball, and installed in the slot of the core and supplied with power to the rotor A stator including an electric winding for rotating and a power generation winding which is installed in the slot of the core and draws electricity induced while the rotor rotates; And Low voltage AC motor generator comprising a; insulating paper for insulating the electric winding and the power winding. The low-voltage AC motor generator as claimed in claim 1, wherein a low voltage can be used as a method for reducing the number of times of the electric windings into the slots of the stator cores with a thick winding. The low-voltage AC motor generator according to claim 2, wherein the external input voltage can be adjusted according to the thickness and the number of windings. The low-voltage AC motor generator according to claim 1, wherein the electric winding and the power generating winding are installed together in the slot of the core. The low voltage alternating current generator according to claim 4, wherein the winding for the power generation is disposed near the rotor, and the winding for the power is disposed on the far side. The low-voltage AC motor generator according to claim 1, wherein the electric windings and the electric power windings are alternately installed in the core slot. The low voltage alternating current electric motor generator according to claim 1, wherein the rotor is a squirrel, a winding, a magnetic field rotor. The power generation winding according to any one of claims 1 to 5, wherein when the electric winding is connected to a three-phase n-pole (n: natural number) in the slot of the core, the power-winding winding is connected to at least three-phase n-pole or more. Low pressure AC motor generator, characterized in that.