WO2006090989A1

WO2006090989A1 - Electric motor with a plurality of rotation shafts and power transmission device therefor

Info

Publication number: WO2006090989A1
Application number: PCT/KR2006/000484
Authority: WO
Inventors: Hyun Ho Kim
Original assignee: Hyun Ho Kim
Priority date: 2005-02-24
Filing date: 2006-02-10
Publication date: 2006-08-31

Abstract

The present invention provides an electric motor with a plurality of rotation shafts which can output basically different rotational speeds at one time and easily increase or decrease the rotational speeds of the rotation shafts, and a power transmission device which can equalize the rotational speeds of the rotation shafts of the motor, the power transmission device comprising unit output shafts hydraulically joined to one or two adjoining unit output shafts so as to be applicable to apparatus or machines requiring a same rotational speed.

Description

ELECTRIC MOTOR WITH A PLURALITY OF ROTATION SHAFTS AND POWER TRANSMISSION DEVICE THEREFOR

Technical Field

[1] The present invention relates to an electric motor with a plurality of rotation shafts having basically different rotational rates respectively, and more particularly to a motor with a plurality of rotation shafts constructed so as to more briefly generate high rotational speeds by combining at least two rotation shafts in internal and external relation to each other, and a power transmission device which is installed to the rotation shafts of the motor with a plurality of rotation shafts and which can equalize differently outputted rotational powers of each of rotation shafts. Background Art

[2] A conventional motor comprises a stator in which a polarity of magnetic force is kept constant, a rotor which is rotatable and has a polarity of magnetic force capable of being varied, and a rotation shaft.

[3] The conventional motor comprises only one rotation shaft which provides rotational power outwardly, and can not obtain rotational power of different speeds from each other concurrently. And, in order to change a rotation speed of the rotation shaft, a speed for alternating poles of the rotor must be changed, and in order to alternate the poles of the rotor above a certain speed, circuit construction becomes complicated and control becomes difficult, and thus there is one problem in that it is difficult to manufacture.

Disclosure of Invention Technical Problem

[4] The present invention is made in order to solve the above problems, and one object of the present invention is to provide an electric motor with a plurality of rotation shafts which are constructed so as to enable the outputting of different rotational speeds and so as to more simply generate high rotational speeds without any complicated circuit construction and without any separate device.

[5] Further, another object of the present invention is to provide a power transmission device which is installed to the motor with a plurality of rotation shafts to output different rotational speeds and can equalize differently outputted rotational powers of each of the rotation shafts, thereby being capable of use in apparatus or machines each shaft of which requires a same rotational speed. Technical Solution

[6] A motor for solving the above problems is provided in accordance with one embodiment of the present invention, which comprises a body having a first stator joined to an inner surface of the body, at least one rotation shaft of a cylindrical shape installed in constantly spaced and inserted relation to each other, and an inmost rotation shaft installed at most inward position of said rotation shaft of a cylindrical shape and having a rotor joined to an outer surface thereof, said rotation shaft of a cylindrical shape having a rotor joined to an outer surface thereof and a stator joined to an inner surface thereof.

[7] Said rotation shaft of a cylindrical shape may comprise a first rotation shaft having a first rotor joined to an outer surface thereof with leaving a constant gap in relation to the first stator, and a second stator joined to an inner surface thereof, a portion of said first rotation shaft being inserted into an inner portion of the body, and a second rotation shaft of a hollow shape having a second rotor joined to an outer surface thereof with leaving a constant gap in relation to the second stator, and a third stator joined to an inner surface thereof, said second rotation shaft being inserted into an inner portion of the first rotation shaft.

[8] It is preferred that insulators be arranged between the body and the first stator, between each rotation shaft and the rotor, and between each rotation shaft and the stator, respectively.

[9] Furthermore, a motor in accordance with another embodiment of the present invention can comprise generator shafts joined to the rotation shafts. In this case, it is preferred that each rotation shaft and each generator shaft be relatively slided in the longitudinal direction of the rotation shafts and be connected in a detachable gear engagement structure.

[10] A power transmission device for accomplishing another object of this invention, is provided in accordance with further another embodiment of the present invention, wh ich includes an input shaft means comprising multiple unit input shafts each of which is rotatably and insertedly installed with leaving a constant gap to one another, a joint shaft means comprising multiple unit joint shafts each of which is rotatably and insertedly installed with leaving a constant gap to one another and is joined to each of the unit input shafts at one end thereof; and an output shaft means comprising multiple unit output shafts each of which is insertedly installed at the other end of each of the unit joint shafts with leaving a constant gap to one another and is hydraulically joined to one or more adjoining unit output shafts.

[11] Still furthermore, a motor for solving the above problems is provided in accordance with still further another embodiment of the present invention, which comprises at least two rotation shafts of a cylindrical shape installed in constantly spaced and inserted relation to each other, and a fixed shaft fixedly installed inside an inmost rotation shaft among the rotation shafts of a cylindrical shape and having a stator joined to an outer surface thereof, said rotation shafts of a cylindrical shape having a rotor joined to an inner surface of each of the rotation shafts and a stator joined to an outer surface of each of the rotation shafts except an outmost rotation shaft facing the inner surface of each of the rotation shafts.

[12] The rotation shafts of a cylindrical shape may comprise a first rotation shaft of a hollow shape having a first rotor joined to an inner surface thereof, and a second rotation shaft of a hollow shape having a first stator joined to an outer surface thereof with leaving a constant gap in relation to the first rotor, and a second rotor joined to an inner surface thereof, said second rotation shaft being inserted into an inner portion of the first rotation shaft.

[13] It is preferred that magnetic insulators be arranged between each of the rotation shafts and each of the rotors, and between each of the rotation shafts and each of the stators, respectively.

[14] Also, the motor can further comprise generator shafts joined to the rotation shafts, each of the rotation shafts and each of the generator shafts being relatively slided in the longitudinal direction of the rotation shafts and being connected in a detachable gear engagement structure. Advantageous Effects

[15] Using a motor according to the present invention has advantages in that it is possible to output rotational powers of mutually different speeds at a time, to easily increase or decrease rotational speeds of the rotation shafts, and to more simply generate high rotational speeds without any complicated circuit construction and without any separate device.

[16] In addition, a power transmission device according to another embodiment of the present invention can be installed to the rotation shafts of the motor with a plurality of rotation shafts and can equalize differently outputted rotational powers of the rotation shafts, hereby outputting an even high speed at the rotation shafts. Also, the power transmission device can prevent the motor from being burned or damaged due to a start load etc., of apparatus or machines connected to the power transmission device. Brief Description of the Drawings

[17] Fig. 1 illustrates a cross-sectional view along a cross direction of rotation shafts of a motor according to one embodiment of the present invention.

[18] Fig. 2 illustrates an exploded perspective view for explaining the structure for joining the rotation shafts of the motor according to one embodiment of the present invention.

[19] Fig. 3 illustrates an exploded perspective view for explaining the structure for joining generator shafts to the rotation shafts of the motor according to another embodiment of the present invention. [20] Fig. 4 illustrates a longitudinal section view of Fig. 3 for explaining a state in which each of the rotation shafts and each of the generator shafts are connected to each other. [21] Fig. 5 illustrates a longitudinal section view of Fig. 3 for explaining a state in which each of the rotation shafts and each of the generator shafts are separated. [22] Fig. 6 illustrates an exploded perspective view of a power transmission device joined to a motor in accordance with further another embodiment of the present invention. [23] Fig. 7 illustrates an exploded perspective view showing an internal structure of the power transmission device of Fig. 6.

[24] Fig. 8 illustrates in partial longitudinal section view, a joined state of Fig. 6.

[25] Fig. 9 illustrates a cross-sectional view of the rotation shafts in the motor according to still further another embodiment of the present invention. [26] Fig. 10 illustrates an exploded perspective view showing a joined structure of the rotation shafts of the motor in Fig. 9. [27] Fig. 11 illustrates an exploded perspective view for explaining a sate in which each of the generator shafts is joined to each of the rotation shafts of the motor in Figs. 9 and 10. [28] Fig. 12 illustrates a longitudinal section view of a state in which each of the rotation shafts and each of the generator shafts are joined to each other. [29] Fig. 13 illustrates a longitudinal section view of a state in which each of the rotation shafts and each of the generator shafts are separated.

Mode for the Invention [30] Fig. 1 illustrates a cross-sectional view along a cross direction of rotation shafts of a motor according to one embodiment of the present invention, and Fig. 2 illustrates an exploded perspective view for explaining the structure for joining the rotation shafts of the motor to one another according to one embodiment of the present invention. [31] As shown in Figs. 1 and 2, a motor according to one embodiment of the present invention comprises a body, a first rotation shaft (100) joined such that a portion of said first rotation shaft is inserted into an inner portion of the body in a rotatable structure, a second rotation shaft (200) inserted into an inner portion of the first rotation shaft (100), and a third rotation shaft (300) inserted into an inner portion of the second rotation shaft (200). [32] [33] *The first rotation shaft (100) is formed of a hollow shape and has a first rotor (110) joined to an outer surface thereof, and a second stator (220) joined to an inner surface thereof. Also, the second rotation shaft (200) is formed of a hollow shape and has a second rotor (210) joined to an outer surface thereof, and a third stator (320) joined to an inner surface thereof. And, the third rotation shaft (300) has a third rotor (310) joined to the outer surface thereof.

[34] Further, the body has a first stator (120) joined thereto with leaving a constant gap in relation to the first stator (110). When electricity is applied to the first rotor (110) and a pole of the first rotor (110) is formed alternatively in a positive pole or in a negative pole, the first rotation shaft (100) begins rotational movement according to the direction of a magnetic field between the first rotor (110) and the first stator (120) and the direction of an electric current applied to the first rotor (110). As explained above, a structure to rotate the first rotation shaft (100) is similar to a structure of the conventional motor, and therefore, further detailed explanation is omitted.

[35] If a pole of the second rotor (210) is fixed while the first rotation shaft (100) rotates, the second rotor (210) rotates with the second stator (220), and therefore, the second rotation shaft (200) rotates with the first rotation shaft (100). Then, if an electrical current is applied so that the pole of the second rotor (210) is changed alternatively, the second rotation shaft (200) rotates so as to generate a speed relative to the first rotation shaft (100) according to a variation in a magnetic power between the second stator (220) and the second rotor (210). For example, when rotation is given to each of the rotation shafts (100, 200, 300) with each rotational speed of (1, 1, or 1), the first rotation shaft (100) rotates at a speed of 1 RPM, and a relative speed between the second rotation shaft (200) and the first rotation shaft (100) is 1 RPM, an absolute speed of the second rotation shaft (200) becomes 2 RPM.

[36] By virtue of such a principle, if the pole of the third rotor (310) is fixed while the first rotation shaft (100) and the second rotation shaft (200) rotate, the third rotation shaft (300) rotates with the second rotation shaft (200). If an electrical current is applied to the third rotor (310) so that the pole of the third rotor (310) is changed alternatively, the third rotation shaft (300) rotates faster than the second rotation shaft (200).

[37] That is, if an electrical current is applied to each of the rotation shafts (100, 200,

300), in case that each relative speed of each of the rotation shafts (100, 200, 300) is 1 RPM, an absolute speed of the second rotation shaft (200) becomes 2 RPM, and an absolute speed of the third rotation shaft (300) becomes 3 RPM.

[38] For example, each absolute rotational frequency of the second rotation shaft (200) and the third rotation shaft (300) can be obtained from each equation of (k2 x il + ml) and {(k2 x il + ml) x k3 + m2}, where all shafts rotate, each rotational frequency of the first rotation shaft (100), the second rotation shaft (200) and the third rotation shaft (300) between each stator and each rotor is kl, k2 and k3, each relative rotational frequency between two rotation shafts is il and i2, and each rotational frequency of each of the rotation shafts (200, 300) is ml and m2 when each stator does not rotate. Also, il and i2 are identical to kl and k2 or (k2 x il + ml) in numeral, and ml and m2 are identical to k2 and k3 in numeral, thereby easily obtaining the rotational frequency from the equations.

[39] As an example, where kl, k2 and k3 are 20, 30 and 40 RPM respectively, each absolute rotational speed is as follows. That is, the absolute rotational speeds of the first, second and third rotation shafts (100, 200, 300) are 20, (30 x 20 + 30) and {(30 x 20 + 30) x 40 + 40}, respectively.

[40] In this case, a user can also control each rotational speed of the rotation shafts (100,

200, 300) by controlling electricity applied to each of the rotors (110, 210, 310).

[41] It is also preferred that insulators (400) for isolating each magnetic power be arranged between each of the rotation shafts (100, 200, 300) and each of the rotors (110, 210, 310), between the body and the first stator (120), between the first rotation shaft (100) and the second stator (220), and between the second rotation shaft (200) and the third stator (320). Since, if the insulators (400) for isolating each magnetic power are arranged at joining portions of the rotors (110, 210, 310) and joining portions of the stators (120, 220, 320), unnecessary magnetic power for a mutual action of each of the rotors (110, 210, 310) and each of the stators (120, 220, 320) is blockaded, and thus each of the rotation shafts (100, 200, 300) can be normally rotated in the motor according to the present invention.

[42] In the present embodiment, the tree rotation shafts (100, 200, 300) are constructed so as to be overlapped in order, but without limitation to the embodiment, the number of the rotation shafts can be freely selected by a user.

[43] The more the number of the rotation shafts increases, the higher rotational speed can be obtained. However, the increased number of the rotation shafts complicates their structure, thereby entailing a difficult manufacturing procedure and making the motor large in size. Thus, it is preferred that the number of the rotation shafts increases or decreases properly according to the use of the motor.

[44] Fig. 3 is an exploded perspective view for explaining the structure for joining each of generator shafts to each of the rotation shafts of the above-mentioned motor according to another embodiment of the present invention, and Fig. 4 is a longitudinal section view of Fig. 3, for explaining a state in which each of the rotation shafts and each of the generator shafts are connected to each other.

[45] As shown in Fig. 3 and Fig. 4, in order to obtain electric powers by rotational powers of the rotation shafts (100, 200, 300), the above-described motor of the present invention can be provided with a first generator shaft (130) joined to the first rotation shaft (100), a second generator shaft (230) joined to the second rotation shaft (200), and a third generator shaft (330) joined to the third rotation shaft (300) according to another embodiment of the present invention. Said generator shafts are constructed so that the rotational power of each of the rotation shafts (100, 200, 300) is transmitted to each of the generator shafts (130, 230, 330).

[46] That is, the first rotation shaft (100) comprises a first male gear (102) having teeth formed in the longitudinal direction of the first rotation shaft (100) on an outer surface of the first rotation shaft (100) to be joined to the first generator shaft (130), and the first generator shaft (130) comprises a first female gear (132) of a structure capable of being joined to the first male gear (102). In such a similar structure, the second rotation shaft (200) and the second generator shaft (230) comprise a second male gear (202) and a second female gear (232), respectively, and the third rotation shaft (300) and the third generator shaft (330) comprise a third male gear (302) and a third female gear (332), respectively.

[47] Fig. 5 is a longitudinal section view of Fig. 3 for explaining a state in which the rotation shafts and the generator shafts are separated.

[48] Each of the generator shafts (130, 230, 330) is constructed in a structure to be relatively slided in the longitudinal direction of each of the rotation shafts (100, 200, 300). If the generator shafts (130, 230, 330) are slided away from the rotation shafts (100, 200, 300) as shown in Fig. 5, joining between each male gear (102, 202, or 302) and each female gear (132, 232, or 332) is released. In this case, although the rotation shafts (100, 200, 300) rotate, the generator shafts (130, 230, 330) do not rotate, the rotation shaft (100, 200, 300) running idle.

[49] A user can utilize a rotational power of the first rotation shaft (100) by connecting the first male gear (102) and the first female gear (132), utilize a rotational power of the second rotation shaft (200) by connecting the second male gear (202) and the second female gear (232), or utilize a rotational power of the third rotation shaft (300) by connecting the third male gear (302) and the third female gear (332). The rotation shafts (100, 200, 300) rotate with respectively different rotational ratios, one of which can be selected and utilized by a user according to his demand.

[50] Further, a user can control a rotational speed of each of the rotation shafts (100,

200, 300) by connecting a gear box to each of the rotation shafts (100, 200, 300). Since, if the rotational speed is fast, the rotational torque becomes low, and if the rotational speed is slow, the rotational torque becomes high, the user may use the gear box so as to control the rotational speed of each of the rotation shafts (100, 200, 300) to a user's demand speed.

[51] Fig. 6 is an exploded perspective view of a power transmission device joined to a motor in accordance with further another embodiment of the present invention, Fig. 7 an exploded perspective view showing an internal structure of the power transmission device of Fig. 6, and Fig. 8 a partial longitudinal section view showing a joined state of Fig. 6.

[52] As shown in the drawings, the power transmission device (600) includes an input shaft means (610) to be joined to, and rotate together with, the rotation shafts (510) of a motor (500) similar to the above-described motor, a joint shaft means (620) to be hy- draulically joined to the input shaft means (610), and an output shaft means (630) formed integrally with the joint shaft means (620), which further comprises a housing means (640) having said shafts (610, 620, 630) built-in.

[53] Here, hydraulic joining is a structure for transmitting power, in which vanes of a shape corresponding to each other are formed on the input shaft means and the output shaft means, respectively, and working fluid or oil is filled up in a gap left between the input shaft means and the output shaft means. If the input shaft means is rotated, the fluid flows by means of the vanes formed on the input shaft means, thereby rotating the output shaft means by rotating the vanes of the output shaft means.

[54] Said input shaft means (610) comprises three unit input shafts (610a, 610b,

610c)each of which is rotatably and insertedly installed with leaving a constant gap to one another.

[55] The unit input shafts (610a, 610b, 610c) comprises a first input shaft (610a) installed at a inmost position, a second input shaft (610b) installed outside the first input shaft (610a), and a third input shaft (610c) installed outside the second input shaft (610a), i.e., at a outmost position. A gear (612) is provided at one end of each of the unit input shafts (610a, 610b, 610c) so as to be joined to each rotation shaft (510) of the motor (500). Further, a plurality of first inward vanes (614), which are separated at equal distances, are provided at an inner circumference of another end of each of the unit input shafts (610a, 610b, 610c).

[56] Said joint shaft means (620) is constructed such that three unit joint shafts (620a,

620b, 620c) are installed in constantly spaced and inserted relation to each other, which are designated as a first joint shaft (620a), a second joint shaft (620b), and a third joint shaft (620c) in order from a unit joint shaft installed at an innermost position. A plurality of first outward vanes (624), which are formed of a shape corresponding to the first inward vanes (614), respectively, are provided at an outer circumference of one end of each of the unit joint shafts (620a, 620b, 620c).

[57] Here, each of said first inward vanes (614) and each of the first outward vanes (624) are formed so as to be arranged in constantly spaced relation to each other and in engagement with each other, and working fluid is filled up in an inner space when the input shaft means (610) and the joint shaft means (620) are joined to each other.

[58] The output shaft means (630) is configured similarly to the input shaft means (610) and the joint shaft means (620), which comprises three unit output shafts (630a, 630b, 630c) installed in constantly spaced and inserted relation to one another. In the output shaft means (630), the unit output shaft installed at an innermost position is called as a first unit output shaft (630a), the unit input shaft installed outside the first unit output shaft (630a) is called as a second unit output shafts (613b), and the unit input shaft installed at an outermost position is called as a third unit output shaft (630c). The first unit output shaft (630a) is provided with a plurality of second outward vanes (632) on an outer circumference thereof. The third unit output shaft (630c) is provided with a plurality of second inward vanes (634) on an inner circumference thereof. The second unit output shaft (630b) is provided with a plurality of second inward vanes (634) and a plurality of second outward vanes (632) on an inner and outer circumference thereof, respectively. In this case, the second inward vanes (634) and the second outward vanes (632) have the same wing angles with, and opposite directions to, each other. Working fluid is filled up in separated spaces (636) between the unit output shafts (630a, 630b, 630c). Meanwhile, the joint shaft means (620) and the output shaft means (630) are configured integrally as described above with washers (638) of a desired thickness provided therebetween.

[59] The housing means (640) comprises three unit housings, and cover means (642a,

642b) to be joined to opposite ends of each of the unit housings in the longitudinal direction. The housing means (640) comprises a first housing (640a), a second housing (640b) and a third housing (640c) in order from the unit housing installed at an innermost position, and the cover means (642a, 642b) comprises three pairs of unit covers, which have concentric shapes, respectively, and which seal up opposite ends of each housing.

[60] The equalizing process of powers to be transmitted using the power transmission device (600) structured as above is as follows.

[61] First, in the transmission process of rotational forces generated by the electric motor

(500) with a plurality of rotation shafts, the rotational forces are transmitted through the input shaft means (610) joined to the rotation shafts (510) of the motor (500), which are then rotated and makes the working fluid in the input shaft means (610) flow, thereby rotating the joint shaft means (620) hydraulically interlocked therewith. Then, the output shaft means (630) formed integrally with the joint shaft means (620) rotates at predetermined speeds by the rotational forces transmitted through the input shaft means (610).

[62] Here, if a rotational speed of an inmost rotation shaft among the rotational speeds outputted through the rotation shafts (510) of the motor (500) with a plurality of rotation shafts is a highest speed, and if a rotational speed of an outmost rotation shaft is a lowest speed, the first input shaft (610a), which is rotated at a highest speed by the inmost rotation shaft, rotates the first output shaft (630a) formed integrally with the first joint shaft (620a), and makes the working fluid flow by means of the second outward vanes (632) formed at the first output shaft (630a). Thus, the flowing fluid pushes and rotates the second inward vanes (634) of the second rotation shaft (630b). Therefore, the second output shaft (630b) rotates at a higher speed than a rotational speed transmitted through the second input shaft (610b) because a rotational speed by the working fluid is added to the rotational speed transmitted through the second input shaft (610b). By virtue of such similar principle, the third output shaft (630c) rotates at a higher speed than a rotational speed transmitted through the third input shaft (610c) because a rotational speed by the working fluid is added to the rotational speed transmitted through the third input shaft (610c). Meanwhile, since a rotational power of the first output shaft (630a) is consumed for rotating the second output shaft (630b), the beginning rotational speed is decreased. Also, since a rotational power of the second output shaft (630b) is consumed for rotating the third output shaft (630c), the beginning rotational speed is decreased to a determined speed, thereby the different rotational speeds transmitted through the input shaft means (610) being equalized and outputted through the power transmission device (600).

[63] Meanwhile, the rotational speed of the output shaft means (630) can be controlled by controlling in number the second outward vanes (632) and the second inward vanes (634) formed outside and inside the unit output shafts (630a, 630b, 630c).

[64] Fig. 9 is a cross-sectional view of rotation shafts in a motor according to still further another embodiment of the present invention, and Fig. 10 is an exploded perspective view showing a joined structure of the rotation shafts of the motor in Fig. 9.

[65] As shown in Figs. 9 and 10, the motor according to still further another embodiment of the present invention comprises a body(lθ), a first rotation shaft (100) joined so that the whole or a portion of said first rotation shaft is inserted into an inner portion of the body (10) in a rotatable structure, a second rotation shaft (200) inserted into an inner portion of the first rotation shaft (100), and a fixed shaft (300) inserted into an inner portion of the second rotation shaft (200).

[66] The first rotation shaft (100) is formed of a hollow shape and has a second stator

(220) joined to an inner surface thereof. Also, the second rotation shaft (200) is formed of a hollow shape and has a first stator (120) joined to an outer surface thereof and a second rotor (210) joined to an inner surface thereof. And, the fixed shaft (300) has a second rotor (220) joined to an outer surface thereof.

[67] When an electric current is applied to the second rotor (210) and a pole of the second rotor (210) is formed alternatively in a positive pole or in a negative pole, the second rotation shaft (200) begins rotational movement according to the direction of a magnetic field between the second rotor (210) and the second stator (220) and the direction of an electric current applied to the second rotor (210). As explained above, a structure to rotate the second rotation shaft (200) is similar to a structure of the con- ventional motor in which a rotor is positioned inside and a stator is positioned outside except that positions of the second rotor (210) and the second stator (220) are changed. Therefore, further detailed explanation thereabout is omitted.

[68] If a pole of the first rotor (110) is fixed when the second rotation shaft (200) rotates, the first rotor (110) rotates with the first stator (120), and therefore, the first rotation shaft (100) rotates with the second rotation shaft (200). Then, if an electrical current is applied so that the pole of the first rotor (110) is changed alternatively, the first rotation shaft (100) rotates so as to generate a speed relative to the second rotation shaft (200) according to a variation in a magnetic power between the first stator (120) and the first rotor (110). That is, when rotation is given to each rotation shaft (200, 100) with each rotational speed of (1, 1), the second rotation shaft (200) rotates at a speed of 1 RPM, and a relative speed between the first rotation shaft (100) and the second rotation shaft (200) is 1 RPM, an absolute speed of the first rotation shaft (100) becomes 2 RPM.

[69] In this case, a user can also control each rotational speed of the rotation shafts (100,

200) by controlling each electricity applied to each rotor (110, 210).

[70] It is also preferred that insulators (400) for isolating each magnetic power be arranged between each of the rotation shafts (100, 200) and each of the rotors (110, 210) and between the second rotation shaft (200) and the first stator (120). Since, if the insulators (400) for isolating each magnetic power are arranged at each joining portion of the rotors (110, 210) and each joining portion of the stators (120, 220), unnecessary magnetic power for a mutual action of each of the rotors (110, 210) and each of the stators (120, 220) is blockaded, and thus each rotation shaft (100, 200) can be normally rotated in the motor according to the present invention.

[71] In the present embodiment, the motor with the two rotation shafts (100, 200) joined is explained for basically understanding the present embodiment, but the motor can be constructed so that three rotation shafts or more may be joined in inserted relation to one another. The more the number of the rotation shafts increases, the higher a maximum speed at an outmost rotation shaft becomes. There, it is preferred that the number of the rotation shafts is controlled properly according to the use of the motor.

[72] The more the number of the rotation shafts increases, the higher rotational speed can be obtained. However, the increased number of the rotation shafts complicate their structure, thereby entailing a difficult manufacturing procedure and making the motor large in size. Thus, it is preferred that the number of the rotation shafts increase or decrease properly according to use of the motor.

[73] Fig. 11 is an exploded perspective view for explaining a sate in which the generator shafts are joined to the rotation shafts of the motor shown in Figs. 9 and 10 according to still further another embodiment of the present invention, and Fig. 12 is a longitudinal section view of Fig. 11 for showing a state in which the rotation shafts and the generator shafts are joined to each other.

[74] As shown in Fig. 11 and Fig. 12, in order to obtain electric powers by rotational powers of the rotation shafts (100, 200), the above-described motor of the present invention can be provided with a first generator shaft (130) joined to the first rotation shaft (100) and a second generator shaft (230) joined to the second rotation shaft (200).

[75] Said generator shafts (130, 230) are constructed so that the rotational power of each of the rotation shafts (100, 200) is transmitted to each of the generator shafts (130, 230).

[76] The first rotation shaft (100) comprises a first male gear (102) having teeth formed in the longitudinal direction of the first rotation shaft (100) on an outer surface of the first rotation shaft (100) to be joined to the first generator shaft (130), and the first generator shaft (130) comprises a first female gear (132) of a structure capable of being joined to the first male gear (102). In such a similar structure, the second rotation shaft (200) and the second generator shaft (230) comprise a second male gear (202) and a second female gear (232), respectively.

[77] Fig. 13 is a longitudinal section view of Fig. 11, showing a state in which the rotation shafts and the generator shafts are separated.

[78] Each of the generator shafts (130, 230) is constructed in a structure to be relatively slided in the longitudinal direction of each of the rotation shafts (100, 200). If the generator shafts (130, 230) are slided away from the rotation shafts (100, 200) as shown in Fig. 13, joining between each of the male gears (102, 202) and each of the female gears (132, 232) is released. In this case, although the rotation shafts (100, 200) rotate, the generator shafts (130, 230) do not rotate, the rotation shaft (100, 200) running idle.

[79] A user can utilize the rotational power of the first rotation shaft (100) by connecting the first male gear (102) and the first female gear (132), or utilize the rotational power of the second rotation shaft (200) by connecting the second male gear (202) and the second female gear (232). The rotation shafts (100, 200) rotate with respectively different rotational ratio, one of which can be selected and utilized by a user according to his demand.

[80] Further, a user can also control the rotational speed of each of the rotation shafts

(100, 200) by connecting a gear box to each of the rotation shafts (100, 200). Since, if the rotational speed is fast, the rotational torque becomes low, and if the rotational speed is slow, the rotational torque becomes high, the user may use the gear box so as to control the rotational speed of each of the rotation shafts (100, 200) to a user's demand speed.

[81] Although the present invention has been explained in detail by the preferred embodiments as described above, the present invention is not limited to the specific em- bodiments, but in the scope shall be determined only by the appended claims. Further, the principle of the present invention can be applied to both of an alternative current and a direct current, and furthermore, to all devices using electricity. The embodiments treat the principle of the present invention as examples, and therefore, applications including the principle of the present invention and considering the embodiments primarily, will still fall within the scope of the present invention. It should be understood to the ordinary skilled person in the art that various changes or modifications thereof are possible without departing from the spirit of the present invention. Industrial Applicability [82] As described above, the present invention relates to an electric motor with a plurality of rotation shafts having basically different rotational rates respectively, and a power transmission device using the motor, thereby being applicable to the conventional industry of electric motors as well as novel industry.

Claims

[ 1 ] A motor comprising a body having a first stator j oined to an inner surface of the body, at least one rotation shaft of a cylindrical shape installed in constantly spaced and inserted relation to each other, and an inmost rotation shaft installed at most inward position of said rotation shaft of a cylindrical shape and having a rotor joined to an outer surface thereof, said rotation shaft of a cylindrical shape having a rotor joined to an outer surface thereof and a stator joined to an inner surface thereof.

[2] The motor according to claim 1, wherein said rotation shaft of a cylindrical shape comprises a first rotation shaft having a first rotor joined to an outer surface thereof with leaving a constant gap in relation to the first stator, and a second stator joined to an inner surface thereof, a portion of said first rotation shaft being inserted into an inner portion of the body, and a second rotation shaft of a hollow shape having a second rotor joined to an outer surface thereof with leaving a constant gap in relation to the second stator, and a third stator joined to an inner surface thereof, said second rotation shaft being inserted into an inner portion of the first rotation shaft.

[3] The motor according to claim 1 or 2, wherein magnetic insulators are arranged between the body and the first stator, between each rotation shaft and the rotor, and between each rotation shaft and the stator, respectively.

[4] The motor according to claim 1 or 2, wherein the motor further comprises generator shafts joined to the rotation shafts.

[5] The motor according to claim 4, wherein each of the rotation shafts and each of the generator shafts are relatively slidable in the longitudinal direction of the rotation shafts and are connected to each other in a detachable gear engagement structure.

[6] A motor which comprises at least two rotation shafts of a cylindrical shape installed in constantly spaced and inserted relation to each other, and a fixed shaft fixedly installed inside an inmost rotation shaft among the rotation shafts of a cylindrical shape and having a stator joined to an outer surface thereof, said rotation shafts of a cylindrical shape having a rotor joined to an inner surface of each of the rotation shafts and a stator joined to an outer surface of each of the rotation shafts except an outmost rotation shaft facing the inner surface of each of the rotation shafts.

[7] The motor according to claim 6, wherein magnetic insulators are arranged between the rotation shafts and the rotors, and between the rotation shafts and the stators, respectively.

[8] The motor according to claim 7 or claim 8, wherein the motor further comprise generator shafts joined to the rotation shafts.

[9] The motor according to claim 8, wherein each of the rotation shafts and each of the generator shafts are relatively slidable in the longitudinal direction of the rotation shafts and are connected to each other in a detachable gear engagement structure.

[10] A power transmission device, which includes an input shaft means comprising multiple unit input shafts each of which is rotatably and insertedly installed with leaving a constant gap to one another, a joint shaft means comprising multiple unit joint shafts each of which is rotatably and insertedly installed with leaving a constant gap to one another and is joined to each of the unit input shafts at one end thereof; and an output shaft means comprising multiple unit output shafts each of which is insertedly installed at the other end of each of the unit joint shafts with leaving a constant gap to one another and is hydraulically joined to one or more adjoining unit output shafts.

[11] The power transmission device according to claim 10, wherein a plurality of first inward vanes are provided at each inner circumference of ones of the unit input shafts and the unit joint shafts, and a plurality of first outward vanes of a shape corresponding to the first inward vanes respectively are provided at each outer circumference of other ones of the unit input shafts and the unit joint shafts, fluid being filled up between the unit input shafts and the unit joint shafts.

[12] The power transmission device according to claim 10 or claim 11, wherein the output shaft means comprises an innermost unit output shaft having a plurality of outward vanes on an outer circumference thereof, an outermost unit output shaft having a plurality of inward vanes on an inner circumference thereof, and one or more unit output shaft having a plurality of second inward vanes and a plurality of second outward vanes on an inner and outer circumference thereof, respectively, fluid being filled up between the unit output shafts.

[13] The power transmission device according to claim 12, wherein the second outward vanes and the second inward vanes have wing angle directions opposite to each other, respectively.