MXPA99000458A - Inversor girato - Google Patents

Abstract

A rotary inverter is described, the rotary inverter comprising a rotary inverter means for inverting a DC power source into an AC power source by means of a rotary force, and a transformer receiving the inverted AC power source by the inverter. rotating half-inverter and emitting a higher voltage, the rotary inverting means comprises a motor that generates the rotating force, a commutator driven by the motor and a plurality of brushes that are respectively brought into contact with the outer surface of the commutator; a cylindrical body made of an insulating material, and conductive parts that are divided into an even number by non-conductive parts, respectively, having a desired width, furthermore, it is preferable that the cooling fan be coupled to the motor together with the switch; therefore, the manufacturing cost is reduced, the friction speed of the current is decreased, the energy lost Because of the heat is diminished, the size of the microwave oven can be smaller, and the output frequency that comes from the rotary inverter can be controlled to stay constant and the microwaves are also irradiated in a more stable way.

Description

ROTARY INVERTER BACKGROUND OF THE INVENTION 1. FIELD OF THE INVENTION The present invention relates to a microwave ionium, and more particularly to a rotary inverter for inverting a DC power source into an AC power source. 2. Description of the Prior Art Generally, an inverter is an apparatus for inverting a DC power source into an AC power source. A normal relay or semiconductor device has been provided in the inverter. Recently, the semiconductor device - such as a thyristor is very commonly used. Figure 1 is a circuit diagram of a conventional inverter employing the semiconductor device. As shown in Figure 1, the conventional inverter circuit employing the semiconductor device comprises a power source _ie CD, an activator circuit 10, a plurality of thl and th2 thyristors, a capacitor Cl and a transformer 20. The plurality of thl and th.2 thyristors are switched on / off by a switching operation of the activating circuit 10, and a current in the primary coil 21 of the transformer 20 it is in turn emitted in this way, then generating that the AC power source has an induced voltage in a secondary coil 22. The inverter employing the semiconductor device "" is connected to home appliances such as a microwave oven to supply a source of AC power to home appliances. Therefore, these household appliances can be used even outdoors or on a ship, on an airplane or in any other vehicle where an AC power source is not available. Here, the microwave oven is an appliance for cooking food using microwaves. The microwave oven is equipped with a high-voltage transformer and a magnetron. The high-voltage transformer serves to raise the source of AC power supplied from the inverter to a high voltage of approximately 2,000V. The magnetron is driven by high voltage and radiates microwaves of a desired frequency. Microwaves vibrate the moisture molecules contained in the food. Therefore, the food is heated by the ¼ cc ± onal heat generated by the vibration of the moisture molecules. However, there is a problem in this type of AC / DC microwave oven provided with the inverter that employs the semiconductor device. That is, since it is necessary to provide a plurality of expensive semiconductor devices for the inverter to be able to emit a desired high voltage for the magnetron, the manufacturing cost is increased.

In the above conventional AC / DC microwave oven there is another problem, since the useful life of a battery that supplies the source "" "of CD power is short, since the friction speed of the current through the device semiconductor is very high. In the above conventional AC / DC microwave oven there is another problem: since the semiconductor device generates excessive heat, the energy loss due to heat is increased. In the above conventional AC / DC microwave oven there is an actional problem: since the size of the cooling fins is increased to cool the semiconductor device, the size of the microwave oven also has to be increased.

BRIEF DESCRIPTION OF THE INVENTION The present invention has been designed to overcome the above problems, and accordingly, an object of the present invention is to provide a rotary inverter in which the manufacturing cost is decreased. Another object of the present invention is to provide a rotary inverter in which the friction speed of the current is decreased by the semiconductor device and the battery life is much longer. Still another object of the present invention is to provide a rotary inverter in which the heat loss of energy is reduced, fc An additional object of the present invention is to provide a rotary inverter whose size is smaller, thus facilitating the operation of the inverter rotary. The above object is achieved by means of the rotary inverter according to the present invention, comprising a rotary inverter means for inverting a DC power source into an AC power source by means of a force rotating, and a transformer that receives the power source "AC inverted by the rotary inverter means and emits a higher voltage." The rotary inverter means comprises a motor that generates the rotating force, a commutator driven by the motor and a plurality of brushes that are placed on the motor. contact respectively with the outer surface of the commutator. The commutator comprises a cylindrical body made of an insulating material, and conductive parts which are divided into an even number by non-conductive parts, respectively, having a desired width, whereby two brushes, the which are adjacent to each other, are brought into contact simultaneously with one side of the conductive parts. Each of the non-conductive parts has a width that is wider than one end of the brush, or which is the same as the end of the brush. The rotary inverter means comprises also a power switch that connects or disconnects the CD power source with the motor and the brushes. A pair of the brushes that are opposite each other are connected through the power switch to the DC power source, and another pair of the brushes, which are opposite each other, is connected to the DC side. 5 transformer. The motor is connected in parallel with the pair of brushes that are connected through the power switch to the CD power source. The power switch is connected in parallel with a capacitor. Between the respective brushes, which are adjacent one to the other, diodes are connected respectively to avoid a , return voltage flow. The transformer comprises a primary coil to which the inverted AC power source is fed by the rotary inverter means, and a secondary coil that emits the induced AC power source from the inverter. the primary coil, the primary coil is made of a plate-type coil that has a larger cross-sectional area than a normal coil. Another object of the present invention is achieved by means of the rotary inverter according to the present invention, comprising a motor that is driven by a DC power source and that generates a rotating force, a switch having a cylindrical body made of an insulating material, and conductive parts that are divided into two parts by non-conducting parts , respectively, that have A desired width, a plurality of brushes which are respectively brought into contact with an outer surface of the commutator, a pair of brushes, which are opposite each other, receive the DC power source, and another pair of the brushes , which are opposite each other, emit the AC power source, and a transformer that receives the AC power source that comes from the brushes and emits a higher voltage. Each of the non-conductive parts has a non-conductive groove that is formed on at least one end of the non-conductive part that is opposite the conductive, the non-conductive groove has a predetermined width. Each of the non-conductive parts has a width that is wider than one end of the brush, or which is the same as the end of the brush. Yet another object of the present invention is achieved by means of the rotary inverter according to the present invention, comprising a motor that is driven by a DC power source and that generates a rotating force, a switch having a cylindrical body made of an insulating material, and conductive parts that are divided into an even number of parts by non-conductive parts, respectively, having a desired width, and plates that are respectively fixed to the lateral ends of the cylindrical body, each of which conductive parts has an extended portion that extends to the lateral ends of the cylindrical body, and the extended portion has a predetermined length, a plurality of brushes that are respectively brought into contact with the outer surface of the commutator, a pair of brushes, which are opposite one another, receive the DC power source, and another pair of the brush brushes, which are opposite each other, emit the AC power source, and a conveyor that receives the AC power source that comes from the brushes and emits a higher voltage. Each plate is formed with a plurality of contact pieces extending outwardly from the outer circumference of the plates and which are alternately brought into contact with each extended portion. Each 10 of the plates is made of a conductive material. Each of The non-conductive parts have a non-conductive groove that is formed on at least one end of the non-conductive part that is opposite the conductive, the non-conductive groove has a predetermined width. Each of the 15 non-conductive parts has a width that is wider than one end of the brushes, or which is the same as the end of the brush. Another object of the present invention is achieved by means of the rotary inverter according to the present invention. invention, which comprises a motor that is driven by a DC power source and that generates a rotating force, a cooling fan rotated by the motor, a commutator rotated by the motor, a plurality of brushes that are put in contact respectively with the outer surface of the commutator, a pair of brushes, which are opposite one another, receive the DC power source, and another, pair of brushes, which are opposite one another, emit the AC power source , and a transformer that receives the AC power source that comes from the brushes and emits a higher voltage. The commutator comprises a cylindrical body made of an insulating material, and conductive parts which are divided into an even number by non-conductive parts, respectively, having a desired width, whereby two brushes, which are adjacent to each other, they are brought into contact simultaneously with one side of the conductive parts. The cooling fan is coupled to the motor along with the switch. Therefore, according to the present invention, the manufacturing cost is reduced, the friction speed of the current is decreased, the energy loss is reduced by heat, and the size of the rotary inverter may be smaller.

BRIEF DESCRIPTION OF THE DRAWINGS The above objects and advantages will become more apparent by describing the present invention with reference to the accompanying reference drawings, in which: Figure 1 is a circuit diagram of a conventional rotary inverter employing a semiconductor device; Figure 2 is a circuit diagram of a rotary inverter according to the first preferred embodiment of the present invention; Figures 3 and 4 are views showing the > operations of how the DC current is inverted in 5 AC current according to the present invention; Figure 5 is a view showing waveforms of a current and a voltage emitted by the inverting operations of Figures 3 and 4; Figure 6 is a schematic view showing the connected state of the component elements of the present > invention; Figure 7 is a perspective view showing a transformer according to the present invention; Fig. 8 is a perspective view showing the connection state of a microwave oven and the rotary inverter of the present invention; Figure 9A is a side view of a switch divided into two parts according to the second preferred embodiment of the present invention; Figure 9B is an enlarged detail of part "A" of Figure 9A; Figure 10 is an exploded perspective view of a switch divided into a plurality of parts according to the third preferred embodiment of the present invention; Figure 11 is a view showing the operation of the switch of Figure 10; and Figure 12 is a schematic view showing the connected state of the "component" elements according to the fourth preferred embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED MODALITY Figure 2 is a circuit diagram of a rotary inverter according to the first preferred embodiment of the present invention. In Figure 2, the reference numeral 100 denotes a rotary inverter means, 110 is a motor, 121 to 124 are brushes, 130 is a switch and 200 is a transformer. The rotary inverter means 100 comprises the switch 130, the brushes 121, 122, 123, 124 and the motor 110. Each of the brushes 121,122,123,124 is brought into contact with the outer surface of the switch 200. The switch 200 is rotated by the motor 110. The rotary inverting means 100 reverses a DC power source in an AC power source by rotating the switch 130. Here, a pair of brushes 121 and 123, which are opposite one another, are connected to the DC power source, and the other pair of the brushes 122 and 124 which are opposite one another are connected to the primary coil 201 of the transformer 200. Each of the diodes to prevent a return voltage flow DI, D2, D3, D4 are respectively connected between the respective brushes 121, 122, 123, 124, which are adjacent to each other. The motor 110 is connected to the DC power source in parallel with the "brush pair 121 and 123. Therefore, the DC power source is supplied to the brushes 121 and 123 and the motor 110 through the switch of power SW10 A CIO capacitor is connected to the power switch SW10 in parallel The switch 130 comprises a cylindrical body 131 and conductive parts 132 which are formed on the outer surface of the cylindrical body 131. The conductive parts 132 are respectively divided into two parts by non-conductive parts 133 having a predetermined width The transformer 200 receives the inverted AC power source by the rotary inverter means 100, and raises or lowers the AC power source to an AC power source having a desired voltage, this AC power source can be provided directly to a household appliance such as a microwave oven. isto with a secondary coil 202 together with the primary coil 201. Here, the primary coil 201 is wound on the input portion of the transformer 200, and receives the inverted AC power source by the rotary inverter means 100. The secondary coil 202 it is wound on the output portion of the transformer 200. Figures 3 and 4 are views showing the operations of how the DC current is inverted in AC current according to the present invention, and Figure 5 is a view showing waveforms of a current and a voltage emitted by the reversing operations of Figures 3 and 4. As shown in Figure 3, a current is fed from a positive terminal of the DC power source to the upper brush 121, and flows through the conductive portion 132 of the switch 132 and the left brush 122 from a lower portion of the primary coil 201 of the transformer 200 to an upper portion of the same In addition, the current is fed to the right brush 124 and circulated through the conductive part 132 and the lower brush 123 to a negative terminal of the DC power source. As shown in Figure 4, the current coming from the positive terminal of the CD power source is fed to the upper brush 121 and flows through the conductive part 132 of the switch 130 and the right brush 124 from the portion of the primary coil 201 of the transformer 200 to the lower portion thereof, while the switch 130 is rotated to a desired angle, for example, to 90 degrees. In addition, the current is fed to the left brush 122 and circulated through the conductive part 132 and the lower brush 123 to a negative terminal of the CD power source. As described above, the current direction in the primary coil 201 of the transformer 200 is changed up and down in turns, thus generating the AC power source of a desired frequency. The waveforms of the current (I) and voltage (V) of this AC power source, which are displayed on an oscilloscope, are described in Figure 5. > Figure 6 is a schematic view showing the connected state of the component elements of the present invention. In figure 6, the reference number 110 is a motor, 111 is a rotary arrow of the motor 110, and 121 to 124 are brushes, 130 is a switch, 200 is a transformer, SW10 is a power switch, CIO is a condenser and BATT is a battery. The switch 130 is coupled to the arrow rotary 111 of the motor 110 to be rotated by a rotational force of the motor 110. The switch 130 comprises a cylindrical body 131 and conductive portions 132 which are formed on the outer surface of the cylindrical body 131. Each one of the conductive parts 133 is divided into two parts by non-conductive parts 133 having a predetermined width. Here, it is preferred that the non-conductive part 133 have a width that is greater than that of each brush 121, 122, 123, 124, or which is the same as this. It employs a 12V or 24V battery as a means to supply a CD power source. Figure 7 is a perspective view showing a transformer according to the present invention. In figure 7, the reference number 210 denotes a core, 201 is a primary coil and 202 is a secondary coil. The AC power source inverted by the rotary inverter means 100 is fed to the primary coil 201. It is preferable that the primary coil 201 be made of a plate-type coil having a larger cross-sectional area than that of a normal coil to be operated to the degree of approximately 50 to 1,000Hz. Figure 8 is a perspective view showing the connection state of a microwave oven and the rotary inverter of the present invention. In Figure 8, the reference number 310 is a top case, 320 is a bottom case, 330 is a front panel and 340 is a connector. On the lower case 320 there are arranged the rotary inverter means 100 and the transformer 200. The rotating inverting means 100 comprises the motor 110, the brushes 121, 122, 123, 124, and the switch 130. The motor 110 is fixedly mounted on the lower case 320 by a clamp 322, and the brushes 121, 122, 123, 124 and the switch 130 are fixedly mounted to the lower case 320 by a housing 324. A vent hole 311 is formed on a portion of the upper case 310. On the front panel 330 there is provided an AC output terminal 332, a display part 334 and an energy interlock SW10. A plug 410 of the microwave oven 400 is connected to the AC output terminal 332 for the power source to be supplied to the microwave oven 400. The rotary inverter means 100 receives the DC power source through the connector 340 from a battery for a vehicle (not shown). The rotary inverter according to the present invention uses an external battery. However, it is also possible to use the battery within the rotary inverter. The operation of the rotary inverter as constructed above, according to the first embodiment of the present invention, will be explained in detail by the attached figures 2 to 8. First of all, a household appliance to be used is connected to the rotary inverter of the present invention. For example, as shown in Figure 8, the > 410 plug of the microwave oven 400 is connected to the AC output terminal 332. In this situation, when the SW10 Power Switch is turned on by a user, the 12V 24V DC power source is supplied from the battery BATT through the power switch SW10 to the motor 110 and the upper brush 121 of the rotary inverter means 100. Therefore, the switch 130_ is rotated by the rotary arrow 111 of the motor 110. The conductive parts 132 are put in contact in this way with the respective brushes 121, 122, 123, 124 in turn, thereby inverting the DC power source in an AC power source. That is, the current that comes from the DC power source supplied from the positive terminal of the The BATT battery is fed through the upper brush 121 of FIG. 3 to the switch 130. The current then flows through the conductive part 132 to the left brush 122, and is fed from the lower portion of the primary coil. 201 of the transformer 200 to the upper portion ^ thereof. Subsequently, the current is circulated through the right brush 124, the conductive part 132 and the lower brush 124 towards the negative terminal of the BATT battery. The DC power source supplied from the positive terminal of the BATT battery is fed through the upper brush 121, the conductive part 132 and the right brush 124 from the upper portion of the primary coil 201 to the lower portion thereof as it is shown in figure 4, while the switch 130 is rotated to a desired angle, for example, at 90 degrees. After that, the current is circulated through the left brush 122, the conductive part 132 and the lower brush 123 towards a negative terminal of the battery. Therefore, at each turn (360 degrees) of the motor 110, the current direction in the primary coil 201 of the transformer 200 is shifted up and down in turns, thus generating the AC power of a desired frequency. Here, the frequency of the AC power source in the primary coil 201 of the transformer 200 is determined in accordance with the rotational speed of the motor 110. The transformer 200 induces the AC power supplied to the primary coil 201 within the secondary coils 202 of the Transformer 200. Secondary coil 202 drives the input AC power to a source of AC output power having a desired voltage proportional to the rotational ratio. The high energy is supplied to the household appliance such as a microwave oven, whereby it is possible to use the household appliance even outdoors or on a ship, on an airplane or any other vehicle where the power source is not available. AC. According to the rotary inverter of the present invention, since the number of structural parts thereof can be reduced, the manufacturing cost decreases. And since the semiconductor device is not used in the previous microwave oven, the friction velocity of the current and the energy lost by heat are also reduced. The size of the microwave oven also decreases by removing the cooling fins. Figure 9A is a side view of a switch divided into two parts according to the second preferred embodiment of the present invention, and Figure 9B is an elongated detail of part "A" of Figure 9A. In Figures 9A and 9B, the switch 130 comprises a cylindrical body 131 and conductive portions 132 that are formed on the outer surface of the cylindrical body 131. The conductive portions 132 are respectively divided into two parts by non-conductive portions 133 having a width predetermined. A non-conductive groove 134 having a predetermined width is formed on at least one end of the non-conductive part 133 opposite the conductive part 132. The non-conductive groove 134 has a width of about 0.1 lmm, preferably 0.4-0.7mm. . Moreover, the non-conductive parts 133 have a width "that is wider than one end of the brushes 121, 122, 123, 124, or which is the same as the end of the brushes." Therefore, at each turn (360 degrees) of the motor 110, the current direction in the primary coil 201 of the transformer 200 is changed twice up and down in turns by the conductive parts 132 which are divided into two parts, thus generating the "AC power of a desired frequency. Meanwhile, there is a friction between the conductive and non-conductive parts 132 and 133 of the switch 130 and the brushes 121, 122, 123, 124. Here, since the conductive parts 132 are made of copper having excellent conductivity, the conductive parts 132 can be expanded to the non-conductive parts 133 by frictional heat. If the conductive parts 132 are expanded to the non-conductive parts 133, it is understood that each conductive part 132 is shortened by the brushes 121, 122, 123, 124. However, according to the present invention, since the non-conductive groove 134 having a predetermined width is formed on the end thereof, the conductive parts 132 are prevented from expanding to the non-conductive part 133 by frictional heat and are shortened by the brushes 121, 122, 123, 124. Figure 10 is an exploded perspective view of a switch divided into a plurality of parts according to the third preferred embodiment of the present invention, and FIG. 11 is a view showing the operation of the switch of FIG. 10 and 11, the switch 130 comprises a cylindrical body 131 and 5 conductive parts 132 that are formed on the outer surface of the cylindrical body 131. The conductive parts 132 are divided respec in an even number of parts, e.g., 10 parts, by non-conductive parts 133 having a predetermined width. Each of the conductive parts 132 has an extended portion 135 extending to the ends > laterals of the cylindrical body 131, and the extended portion 135 has a predetermined length. The switch 130 further comprises plates 140 and 150 which are respectively fixed to the lateral ends of the cylindrical body 131. Each plate and 150 is formed with a plurality of contact pieces 141 and 151 extending outwardly from the outer circumference of plates 140 and 150 and which are alternately contacted with each extended portion 135. Plates 140 and 150 They are made of a conductive material. A The non-conductive groove 134 having a predetermined width is formed on each at least one end of the conductive part 133 opposite the non-conductive part 132. Furthermore, the non-conductive parts 133 have a width that is wider than one end of the groove. the brushes 121, 122, 123, 124, or that is the same as the end of the brushes. Therefore, as shown in Fig. 11, the current of the DC power supply supplied from the positive terminal of the battery BATT is fed through the upper brush 121, the conductive parts 132, each of the pieces of contact 151 of the plate 150 which is brought into contact with the extended portions 135, and the right brush 124 which comes from the upper portion of the primary coil 201 of the transformer 200 to the lower portion thereof. Subsequently, the current is made to circulate through the left brush 122, the conductive part 132, each of the contact pieces 141 of the plate 140 which is brought into contact with the extended portions 135 and the lower brush 123 to the negative terminal of the BATT battery. Therefore, at each turn (360 degrees) of the motor 110, the current direction in the primary coil 201 of the transformer 200 is shifted up and down in turns, thus generating the AC power of a desired frequency. Here, the frequency of the AC power source in the primary coil 201 of the transformer 200 is determined in accordance with the rotational speed of the motor 110. Therefore, to increase or decrease the frequency of the AC power source, the rotational speed of the 110 motor has to be controlled. However, according to the present invention, since the current direction in the primary coil 201 of the transformer 200 is changed 10 times up and down in turn during each rotation (360 degrees) of the motor 110, the AC power can be generated. of a higher frequency. Therefore, it is possible to generate the highest frequency AC energy without increasing the rotational speed of the motor 110. Figure 12 is a schematic view showing the connected state of the component elements according to the fourth preferred embodiment of the present invention. . In Figure 12, a motor 110 is provided which is driven by the power source CD and which generates a rotary force, a cooling fan 160 rotated by the motor 110, and a switch 130 rotated by the motor 110. Here, the cooling fan 160 and the switch 130 are coupled to a rotary arrow 111 of the motor 110. Therefore, the switch 130 is driven by the motor 110, thus generating the AC power source. The cooling fan 160 is also driven by the motor 110, whereby the motor 110, the switch 130 and the transformer 200 are cooled. Since the cooling fan 160 is driven by the rotary force of the rotating shaft 11, a separate energy source for the cooling fan 160 is not necessary, thereby decreasing the manufacturing cost and the frictional velocity of the current. According to the rotary inverter of the present invention, since the number of structural parts thereof can be reduced, the manufacturing cost is decreased. In the same way, the useful life of the battery that supplies the power source CD can be much longer, since the semiconductor device described in the prior art is not used and the friction velocity of the current is very low, in addition, the loss of energy by heat is decreased, since the semiconductor device described is not used. in the prior art. Moreover, since the cooling pads used in the prior art can be removed, the size of the microwave oven may be smaller. In addition, according to the present invention, the output frequency that comes from the rotary inverter means * can be selectively controlled by means of the rotating speed of the motor and the number of conductive parts. Moreover, since the cooling fan is directly coupled to the rotating shaft of the motor, the manufacturing cost and the friction velocity of the current are reduced. Although the present invention has been shown and described particularly with reference to the preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the invention. invention, defined by the appended claims.

Claims (21)

NOVELTY OF THE INVENTION CLAIMS

1. - A rotary inverter comprising: a rotary inverter means for inverting a DC power source in an AC power source by means of a rotating force; and a transformer that receives the AC power source inverted by the rotary inverter means and emits a higher voltage.

2. - A rotary inverter according to claim 1, further characterized in that the rotary inverter means comprises a motor that generates the rotating force, a commutator driven by the motor and a plurality of brushes that respectively make contact with an outer surface of the commutator .

3. - A rotary inverter according to claim 2, further characterized in that the switch comprises a cylindrical body made of an insulating material, and conductive parts that are divided into an even number by non-conductive parts, respectively, having a desired width , whereby two brushes, when adjacent to each other, are brought into contact simultaneously with one side of the conductive parts.

4. - A rotary inverter according to claim 3, further characterized in that each of the non-conductive parts has a width that is wider than one end of the brush, or which is the same as the end of the brush.

5. - A rotary inverter according to claim 2, further characterized in that the rotary inverter means further comprises an energy switch that connects or disconnects the DC power source with the motor and brushes.

6. - A rotary inverter according to claim 5, further characterized in that a pair of brushes that are opposite each other are connected through the power switch to the DC power source, and another pair of brushes that are opposite each other is connected to the side of the transformer.

7. - A rotary inverter according to claim 6, further characterized in that the motor is connected in parallel with the pair of brushes that is connected through the power switch to the DC power source.

8. A rotary inverter according to claim 5, further characterized in that the power switch is connected in parallel with a capacitor.

9. - A rotary inverter according to claim 2, further characterized in that between the respective brushes, which are adjacent to each other, diodes are respectively connected to prevent a return voltage flow.

10. A rotary inverter according to claim 1, further characterized in that the transformer comprises a primary coil to which the inverted AC power source is fed by the rotary inverter means, and a secondary coil that emits the power source AC induced from the primary coil, the primary coil is made of a plate-type coil that has a larger cross-sectional area than a normal coil.

11. A rotary inverter comprising: a motor that is driven by a DC power source and that generates a rotating force, - a switch having a cylindrical body made of an insulating material, and conductive parts that are divided in two. non-conductive parts, respectively, having a desired width; a plurality of brushes which are respectively brought into contact with the outer surface of the commutator, a pair of brushes, which are opposed to each other, receive the CD energy source, and the other pair of brushes, which are also opposite each other. one to the other, they emit the AC power source; and a transformer that receives the AC power source that comes from the brushes and that emits a higher voltage.

12. - A rotary inverter according to claim 11, further characterized in that each of the non-conductive parts has a non-conductive groove that is formed on at least one end of the non-conductive parts that are opposite the conductive parts, the non-conductive groove has a predetermined width.

13. A rotary inverter according to claim 12, further characterized in that each of the 5 non-conductive parts has a width that is wider than one end of the brush, or which is the same as the end of the brush. brush.

14. - A rotary inverter comprising: a motor that is driven by a DC power source and that generates 10 a rotating force, - a switch having a cylindrical body made of an insulating material, and conductive parts that are divided into an even number of parts by non-conductive parts, respectively, having a desired width, and plates that are fixed respectively to the extremes 15 of the cylindrical body, each of the conductive plates has an extended portion extending towards the lateral ends of the cylindrical body, and the extended portion has a predetermined length; a plurality of brushes that are respectively brought into contact with the 20 outer surface of the commutator, a pair of brushes, which are opposed to each other, receive the DC power source and the other pair of brushes, which are also opposite one another, emit the power source of AC; and a transformer that receives the AC power source 25 that comes from the brushes and emits a higher voltage.

15. - A rotary inverter according to claim 14, further characterized in that each plate is formed with a plurality of contact pieces extending outwardly from the outer circumference of the plates and which are alternately brought into contact with each portion extended.

16. A rotary inverter according to claim 15, further characterized in that each of the plates is made of a conductive material. -

17. - A rotary inverter according to claim 14, further characterized in that each of the non-conductive parts has a non-conductive groove that is formed on at least one end of the non-conductive parts that are opposite the conductive parts , the non-conductive groove has a predetermined width.

18. - A rotary inverter according to claim 17, further characterized in that each of the non-conductive parts has a width that is wider than one end of the brushes, or which is the same as the end of the brush.

19. A rotary inverter comprising: a motor that is driven by the DC power source and generates a rotating force; a cooling fan spun by the motor; a switch made by the motor; a plurality of brushes which are respectively brought into contact with the outer surface of the commutator, a pair of the brushes, which are opposed to each other, receive the CD energy source, and another pair of brushes, which are opposite one to the other, they emit the AC power source; and a transformer that receives the AC power source that comes from the brushes and emits a higher voltage.

20. A rotary inverter according to claim 19, further characterized in that the switch comprises a cylindrical body made of an insulating material, and conductive parts that are divided into an even number by non-conductive parts, respectively, having a desired width , whereby two brushes, which are adjacent to one another, are brought into contact simultaneously with one side of the conductive parts.

21. A rotary inverter according to claim 19, further characterized in that the cooling fan is coupled to the motor together with the switch.