JP5426877B2 - Torque transmission device - Google Patents

Description

  The present invention mainly relates to a torque transmission device that receives torque that is continuous and substantially constant on an output shaft of a prime mover and transmits torque discontinuously and periodically.

  Generally, the output shaft of a motor, such as an electric motor, outputs a torque that is continuous and almost constant, but when a discontinuous and periodic torque is required, such as when a watch is stepped or an impact driver rotates. A torque transmission device that receives torque from the output shaft of the prime mover and transmits torque discontinuously and periodically is required. Many techniques for configuring this type of torque transmission device by combining mechanical elements have been proposed. However, the torque transmission device using a combination of machine elements has a problem that noise is generated.

  On the other hand, a torque transmission device that performs torque transmission by electromagnetic force is disclosed (see, for example, Patent Document 1). In the torque transmission device described in Patent Document 1, a driving rotating body on the driving side and a driven rotating body on the driven side are arranged coaxially, and a magnet is provided on one of the driving rotating body and the driven rotating body, and the other. It has a configuration in which a plate-like conductor is provided.

In this configuration, the magnetic flux generated by the magnet is linked to the conductor as the prime mover rotates, and the magnetic flux changes over time, so an induced current (eddy current) flows through the conductor, and this induction The torque of the driving rotator is transmitted to the driven rotator by electromagnetic force generated by the action of current and magnetic flux. Therefore, by appropriately arranging the magnet and the conductor, it is possible to intermittently transmit the torque of the driving rotor to the driven rotor.
JP 2007-228735 A

  By the way, in the torque transmission device described in Patent Document 1, it is possible to intermittently transmit a substantially constant torque output from the prime mover that drives the prime mover to the follower rotator, but to the follower rotator. Torque is determined by the arrangement of the magnet and conductor and the rotational speed of the prime mover, so if the rotational speed of the prime mover is constant, the average load of the prime mover will be constant. Cannot be adjusted.

  The present invention has been made in view of the above-mentioned reasons, and its purpose is to adjust the average load necessary for the prime mover while maintaining the maximum torque, and also to adjust the cycle for transmitting torque. It is to provide a torque transmission device that is possible.

The invention according to claim 1 has a driving rotator on the driving side and a driven rotator arranged coaxially with the driving rotator on the driven side, and one of the driving rotator and the driven rotator is in the plane of rotation. A magnet that generates a magnetic flux in a direction crossing the rotation direction and imparts a distribution to the magnetic flux in the rotation direction, and the other of the driving rotating body and the driven rotating body is linked to a magnetic field generated by the magnet during the one rotation. And a plurality of induction conductors formed in an annular shape, and an induced current is passed through the induction conductor at a timing detected by a position sensor that detects one rotational position of the driving rotor and the driven rotor. The position sensor includes a control unit that switches between a closed state and an open state that cuts off an induced current, and the position sensor uses a part of a plurality of induction conductors.

According to a second aspect of the invention, in the first aspect of the invention, the guiding conductor is wound a plurality of times.

According to a third aspect of the present invention, in the first aspect of the present invention, the guiding conductor is formed by laminating an annular divided conductor in a plurality of layers in the mouth axis direction.

According to a fourth aspect of the present invention, in the first aspect of the invention, the inductive conductor is formed such that a thickness dimension in the mouth axis direction is larger than a width dimension in a plane perpendicular to the mouth axis direction in the cross section of the current path. It is characterized by that.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a core made of a magnetic material is added to the inside of the guiding conductor.

The invention of claim 6 is characterized in that, in the invention of claim 5 , the core is formed of a laminated body of magnetic thin plates divided in a direction intersecting with the magnetic flux interlinking with the guiding conductor.

In the invention of claim 7, in the invention of any one of claims 1 to 6, one of said driven rotary member and the driving rotating body, the magnetic path on the opposite side of the magnet in the induction conductor A first yoke to be formed is added.

In the invention of claim 8 , in any one of the inventions of claims 1-4 , a core made of a magnetic material is added to the inside of the guiding conductor to one of the driving rotor and the driven rotor. A first yoke that forms a magnetic path is added to the other of the driving rotor and the driven rotor on the opposite side of the guiding conductor from the magnet, and the core and the first yoke are integrated. It is characterized by that.

According to a ninth aspect of the present invention, in any one of the first to eighth aspects of the present invention, a magnetic path is provided on one side of the driving rotating body and the driven rotating body on the opposite surface side of the magnet to the guiding conductor. A second yoke to be formed is added.

According to a tenth aspect of the present invention, in any one of the first to ninth aspects, the control unit includes a switching element that switches the guiding conductor between a closed state and an open state.

According to an eleventh aspect of the present invention, in any one of the first to tenth aspects of the present invention, the magnetic field generated by the magnet together with the guiding conductor is linked to one of the driving rotating body and the driven rotating body. An annular power generating conductor and a power circuit for storing the induced electromotive force generated in the power generating conductor and using it as a power source for the control unit are added.

According to a twelfth aspect of the present invention, in the eleventh aspect of the present invention, at least a part of the guiding conductor is also used as the power generating conductor.

  According to the configuration of the first aspect of the present invention, when the driving rotating body and the driven rotating body relatively rotate, the magnetic flux interlinking with the guiding conductor changes with time, and the driving rotating body follows the driving rotating body. Torque is transmitted to the rotating body. In addition, since the control unit switches between a closed state in which the induced current flows through the induction conductor and an open state in which the induced current is cut off, the induced current flows and torque is generated in the closed state, and the induced current does not flow in the open state. Torque is not generated. That is, by setting the induction conductor in a closed state at an appropriate timing, the maximum value of the torque due to the induction current is secured, but the induction conductor is opened in other periods so that no induction current flows. The average load for rotating the can be adjusted. In addition, since the control unit adjusts the timing at which the induced current flows through the induction conductor, it is also possible to adjust the period for transmitting torque.

Furthermore, since the position sensor which detects one rotation position of a driving | running | working rotary body and a driven rotary body is switched and it switches between a closed state and an open state at the timing detected by the position sensor, a driving | running | working rotary body and a driven rotary body It is possible to control the timing of transmitting torque periodically and automatically according to any one of the rotational positions.
In addition, since the position sensor can detect the rotational position without diverting other members, the position sensor function can be added at low cost.

According to the configuration of the invention of claim 2 , since the induction conductor is wound a plurality of times, the number of turns of the induction conductor interlinked with the magnetic flux generated by the magnet increases, and a large electromagnetic force is generated accordingly. become. That is, compared to a one-turn induction conductor, the transmission torque is large if the size is the same, and the size can be reduced if the transmission torque is the same.

According to the configuration of the invention of claim 3 , since the annular divided conductors are laminated, it is possible to increase the number of turns, and in a plane orthogonal to the magnetic flux interlinking with the guiding conductor. Since the size can be reduced, loss due to eddy current flowing on the surface of the induction conductor can be reduced. In addition, the printed wiring board which used the insulating sheet for the base material can be used for a division | segmentation conductor, and it becomes easy to position and laminate | stack a division | segmentation conductor in this structure.

According to the configuration of the invention of claim 4 , since the dimension in the plane orthogonal to the magnetic flux interlinking with the guiding conductor can be reduced in the cross section of the guiding conductor, the copper loss of the guiding conductor is increased. In addition, loss due to eddy current flowing on the surface of the guiding conductor can be reduced.

According to the configuration of the invention of claim 5 , since the core made of a magnetic material is arranged inside the guiding conductor, the magnetic flux interlinking with the guiding conductor can be increased, and the maximum value of the transmission torque accordingly. Can be increased.

According to the configuration of the sixth aspect of the invention, since the laminated body of the magnetic thin plates divided in the direction intersecting with the magnetic flux interlinking with the induction conductor is used for the core, the eddy current is less likely to flow in the core. The iron loss due to can be reduced.

According to the configuration of the seventh aspect of the invention, since the first yoke for forming the magnetic path is provided on the surface of the induction conductor opposite to the magnet, the magnetic path of the magnetic path through which the magnetic flux linked to the induction conductor passes. The resistance is reduced, and the maximum value of the transmission torque can be increased.

According to the configuration of the eighth aspect of the invention, the first yoke that forms a magnetic path through which the magnetic flux interlinking with the guiding conductor passes and the core that increases the magnetic flux interlinking with the guiding conductor are integrally provided. Therefore, the magnetic resistance of the magnetic path through which the magnetic flux linked to the guiding conductor passes is reduced and the magnetic flux linked to the guiding conductor is increased, and the maximum value of the transmission torque can be increased accordingly. Become. In addition, since the first yoke and the core are integrally formed, there is no increase in the magnetic resistance at the connecting portion between the first yoke and the core, and the induction conductor is arranged at the position of the core. There is an advantage that the positioning of the conductor is facilitated.

According to the configuration of the ninth aspect of the invention, by providing the second yoke that forms the magnetic path of the magnet, the magnetic resistance of the magnetic path can be reduced, and the maximum value of the transmission torque can be increased. it can. The second yoke can function as a magnetizing yoke when magnetizing the magnet.

According to the configuration of the invention of claim 10, since the guiding conductor is switched between the closed state and the open state by the switching element, it is possible to switch between the closed state and the open state at high speed, and the closed state in a very short time. By switching between the open state and the open state, the timing for transmitting the average load and torque can be changed variously.

According to the configuration of the invention of claim 11 , since the power generation conductor is provided and the induced electromotive force generated in the power generation conductor is used as the power source of the control unit, it is possible to supply power to the control unit without providing a separate power circuit. It becomes possible. As a result, it is not necessary to supply power from the outside, and a contact for power supply and the like are not required. Therefore, a long life and low noise can be achieved.

According to the twelfth aspect of the invention, since at least a part of the inductive conductor is also used as the power generating conductor, the power of the control unit can be secured with a simple configuration without providing a power generating conductor separately. Can do.

  As shown in FIG. 2, the torque transmission device Z described in the present embodiment is interposed between a motor X as a prime mover and a load Y to which torque is transmitted, and is continuously and substantially constant from the output shaft of the motor X. The torque is output discontinuously and periodically in response to the torque output with the magnitude of.

  The torque transmission device Z includes a driving rotor 1 to which a motor X is coupled and a driven rotor 2 to which a load Y is coupled. The torque transmission device Z includes a control unit 3 that switches between a closed state in which an induction current flows through an induction conductor, which will be described later, and an open state in which no induction current flows through the induction conductor. Torque is transmitted between the driving rotor 1 and the driven rotor 2 using electromagnetic force, and the driving rotor 1 and the driven rotor 2 are not mechanically coupled (in this sense, FIG. In FIG. 2, the driving rotor 1 and the driven rotor 2 are connected by a broken line).

  In the present embodiment, as shown in FIG. 1, the driving rotator 1 and the driven rotator 2 are each formed in a cup shape (a bottomed cylindrical shape with one bottom surface open), and the inner side of the driven rotator 2. Shows an example in which the driving rotor 1 is arranged. In the illustrated example, the driving rotor 1 and the driven rotor 2 are open on the opposite bottom surfaces (that is, the driving rotor 1 is the lower bottom surface and the driven rotor 2 is the upper bottom surface). You may employ | adopt the structure which open | released. In addition, although the motor X that rotates the driving rotor 1 is disposed inside the driving rotor 1 for miniaturization, the motor X may be disposed outside the driving rotor 1. The driven rotating body 2 has a rotating shaft 21 projecting from the center of the bottom surface, which is the rotation center, and the output shaft 11 and the rotating shaft 21 of the motor X, which is the rotation center of the driving rotating body 1, are arranged coaxially.

  As described above, when the driving rotor 1 is disposed inside the driven rotor 2, the outer surface of the peripheral wall of the driving rotor 1 faces the inner surface of the peripheral wall of the driven rotor 2. Permanent magnets (magnets) 12 magnetized with a plurality of poles (eight poles in the illustrated example) are provided on the peripheral wall of the driving rotor 1 so as to be different magnetic poles alternately in the rotation direction of the driving rotor 1. . Therefore, the permanent magnet 12 generates a magnetic flux in a direction crossing the rotational direction of the driving rotor 1, and imparts a distribution to the magnetic flux in the rotational direction.

  The peripheral wall of the driving rotor 1 can be formed by holding an independent permanent magnet 12 with a holding member such as a synthetic resin, but is formed by performing multipolar magnetization on a cylindrical magnetic body. Is desirable. The magnetizing direction is a radial direction (radial direction), and the inner side and the outer side of the driving rotor 1 are magnetized so as to have different magnetic poles.

  On the other hand, a plurality of (eight in the illustrated example) guiding conductors 22 formed in an annular shape (annular or rectangular annular shape) are provided on the peripheral wall of the driven rotor 2. The central angle at which the guiding conductor 22 expects the rotation center of the driven rotor 2 is set to about 40 degrees. The peripheral wall 23 of the driven rotor 2 is formed in a cylindrical shape from a nonmagnetic material such as a synthetic resin and having an insulating property, and the guiding conductor 22 is fixed to the inner surface of the peripheral wall 22. The induction conductor 22 is disposed at a portion that can face the permanent magnet 12, and the magnetic flux generated from the permanent magnet 12 along with the rotation of the driving rotor 1 is linked to the induction conductor 22. Further, this magnetic flux changes with time due to the rotation of the driving rotor 1.

  Incidentally, as described above, the control unit 3 is connected to the induction conductor 22, and it is possible to select a closed state in which the induction current flows through the induction conductor 22 and an open state in which the induction current is blocked. ing. The induction conductors 22 are connected in series as shown in FIG. 3A, or connected in parallel as shown in FIG. 3B, and a series circuit or a parallel circuit of a plurality of induction conductors 22 is connected. A switching element SW is connected between both ends. In the case of the parallel connection, the inductance can be reduced compared to the series connection. The arrows shown in FIG. 3 indicate the moving direction of the permanent magnet 12.

  The control unit 3 includes a switching element SW and a control circuit (see FIG. 10) that controls on / off of the switching element SW. As the switching element SW, a bipolar transistor, MOSFET, IGBT, a three-terminal bidirectional thyristor, or the like can be used. In addition, if high-speed on / off is unnecessary, the closed state and the open state may be switched by another switch element such as an electromagnetic relay.

  Here, since a current flows in the opposite direction in each pair of guiding conductors 22 adjacent to each other in the rotation direction of the driven rotor 2, the left and right different ends in FIG. 3 are connected to the adjacent guiding conductors 22. In the configuration shown in FIG. 1, the permanent magnet 12 has 8 poles and 8 induction conductors 22 are provided. In FIG. 3, the permanent magnet 12 has 6 poles and 6 induction conductors 22 are provided.

  Although the ON / OFF timing of the switching element SW can be set as appropriate, a position sensor (not shown) is provided in the control unit 3, the rotational position of the driving rotary body 1 or the driven rotary body 2 is detected by the position sensor, and the detected rotation is detected. It is desirable to control on / off of the switching element SW according to the position. As the position sensor, a magnetic sensor such as a Hall IC that detects the rotational position of the permanent magnet 12 can be used, or a rotary encoder coupled to the output shaft 11 or the rotary shaft 21 can be used. If a part of the guiding conductor 22 is used as a position sensor, the rotational position can be detected without adding other members, so that the position sensor function can be added at low cost.

  The operation will be described below. First, a closed state in which the switching element SW is on will be described. When the motor X rotates and the prime mover 1 rotates, the magnetic flux generated from the permanent magnet 12 and interlinked with the guiding conductor 22 changes with time, so that it is guided to the guiding conductor 22 so as to prevent the magnetic flux from changing. Current flows. Therefore, an electromagnetic force is generated between the induced current and the magnetic flux from the permanent magnet 12, and the driven rotor 2 is rotated by this electromagnetic force. That is, the driven rotor 2 can be rotated on the same principle as that of the induction motor. Here, since the driven rotator 2 rotates as the driving rotator 1 rotates, torque is transmitted from the driving rotator 1 to the driven rotator 2 through the electromagnetic force described above.

  Here, a plurality of guiding conductors 22 are arranged apart from each other in the rotation direction of the driven rotor 2, and the permanent magnet 12 having a plurality of poles rotates together with the driving rotor 1, and thus acts on the guiding conductor 22. The electromagnetic force changes periodically, and the torque acting on the driven rotor 2 periodically increases and decreases as shown in FIG. In the configuration shown in FIG. 1, since the eight-pole permanent magnet 12 and the eight guiding conductors 22 are combined, the torque changes in eight cycles during one rotation of the driving rotor 1. In other words, the maximum torque (torque peak value) appears eight times during one rotation of the driving rotor 1. Specifically, at the rotation angle of 45 degrees of the prime mover 1, the torque is the same pattern for each angle range of −22.5 to 22.5 degrees, 22.5 to 67.5 degrees,. Change.

  On the other hand, since the induction current does not flow in the open state in which the switching element SW is turned off, the electromagnetic force described above does not act on the induction conductor 22, and at this time, torque cannot be transmitted to the driven rotor 2. Therefore, if the driving rotor 1 is closed only during a period in which the driving rotor 1 is at an appropriate rotational position and the remaining period is open, torque can be transmitted to the driven rotor 2 only during the period of closing.

  The example shown in FIG. 4B shows a case where the switching element SW is turned on (that is, in the closed state) in the angle range in which the driving rotor 1 is 22.5 to 67.5 degrees. In order to control on / off of the switching element SW at such timing, the above-described position sensor may be used. In the example shown in FIG. 4B, torque is transmitted from the driving rotor 1 to the driven rotor 2 only in a period in which the driving rotor 1 is in an angle range of 22.5 to 67.5 degrees, and the other periods Therefore, no torque is transmitted to the driven rotor 2. As a result, the average load torque is reduced to about one-eighth compared with the operation of FIG. 4A in which the torque is transmitted over the entire period.

  By the way, as the guiding conductor 22, a printed wiring board using a flexible insulating sheet as a base material and having an annular conductor pattern is used. This conductor pattern is partially opened, and a switching element SW is provided in the open part. Therefore, the inductive conductor 22 and the switching element SW can be integrally provided by mounting the surface mounting type switching element SW on the printed wiring board.

  By the way, although the conductor pattern functions as the guiding conductor 22 even with one turn, if the electromagnetic force generated when there is one turn of the guiding conductor 22 is F, if the number of turns becomes N, N · F electromagnetic Force acts. Therefore, as shown in FIG. 5 (a), when the conductor pattern 22a functioning as the guiding conductor 22 is formed in a spiral shape, the electromagnetic force acting on the guiding conductor 22 can be increased by one turn. It is possible to increase the torque transmitted to the driven rotor 2 as a result. That is, by winding the guiding conductor 22 a plurality of times, the transmission torque with the same size can be increased. Further, if the transmission torque is about the same as that in the case of one turn, the permanent magnet 12 of the driving rotor 1 and the guiding conductor 22 of the driven rotor 2 can be reduced in size, thereby reducing the overall size. To contribute.

  In order to increase the number of turns of the induction conductor 22, as shown in FIG. 5B, a plurality of annular divided conductors 22 b formed in one turn are provided, and the divided conductors 22 b are laminated in the direction of the opening axis of the induction conductor 22. In addition, it may be electrically connected so as to form one winding. In this case, it is possible to reduce the dimension in a plane orthogonal to the magnetic flux interlinking with the induction conductor 22 while securing the torque, and as a result, loss due to eddy current flowing on the surface of the induction conductor 22. Can be reduced. Moreover, since the division | segmentation conductor 22b uses the insulating sheet as a base material, the positioning in the case of lamination | stacking is easy.

  In the configuration example shown in FIG. 5, since the guiding conductor 22 is formed of a printed wiring board, the positional relationship of the guiding conductor 22 can be determined in advance by a conductor pattern. The assembly work at the time of attaching to 2 becomes easy.

  By the way, in order to reduce the eddy current generated in the guiding conductor 22, it is effective to reduce the size of the guiding conductor 22 in the plane orthogonal to the magnetic flux interlinking with the guiding conductor 22 as described above. is there. Therefore, if the electric resistance of the current path in the induction conductor 22 is the same, the thickness dimension D1 in the mouth axis direction and the in-plane width dimension perpendicular to the mouth axis direction in the cross section of the current path as shown in FIG. 6B. Compared with the case where W1 is substantially equal (D1≈W1), the eddy current can be reduced by making the thickness dimension D2 larger than the width dimension W2 (D2> W2) as shown in FIG. 6A. That is, by making the cross section of the current path in the induction conductor 22 have such a dimensional relationship, the eddy current can be further reduced, and the loss can be reduced by generating the eddy current.

  In order to increase the torque transmitted to the driven rotor 2, a configuration is adopted in which the magnetic flux interlinked with the guiding conductor 22 is increased or the magnetic resistance of the magnetic path including the permanent magnet 12 and the guiding conductor 22 is reduced. May be. For example, as shown in FIG. 7, if a core 24 made of a magnetic material is provided inside the guiding conductor 22, the magnetic flux linked to the guiding conductor 22 can be increased, and the maximum value of the transmission torque is increased accordingly. It becomes possible to do. Here, the magnetic material can suppress the generation of eddy currents and iron loss by using a ferrite having a large electric resistance.

  As shown in FIG. 8, the core 24 may be formed by laminating magnetic thin plates 24 a in a direction intersecting with the magnetic flux interlinking with the guiding conductor 22. In this case, the core 24 becomes a laminated iron core, and iron loss due to eddy current flowing in the core 24 can be reduced. The stacking direction can be the rotational direction of the driven rotator 2 as shown in FIG. 8A, or the extending direction of the rotating shaft 21 of the driven rotator 2 as shown in FIG. 8B. In addition, the structure which laminate | stacks the magnetic thin plate 24a in the radial direction (radial direction) of the driven rotary body 2 is also considered.

  On the other hand, as a configuration for reducing the magnetic resistance of the magnetic path, as shown in FIG. 9A, between the peripheral wall 23 of the driven rotor 2 and the guiding conductor 22 (that is, the permanent magnet 12 in the guiding conductor 22). It is possible to adopt a configuration in which the first yoke 25 made of a magnetic material is disposed on the side opposite to the above. Further, as shown in FIG. 9B, the core 24 and the first yoke 25 shown in FIG. 8 may be used in combination. In this case, it is desirable to form the core 24 and the first yoke 25 integrally. That is, by providing a convex portion that becomes the core 24 on the inner surface of the first yoke 25, the core 24 and the first yoke 25 can be formed continuously and integrally. By adopting this configuration, it is possible to prevent an increase in the magnetic resistance at the connecting portion between the core 24 and the first yoke 25, and the core 24 can be used for positioning the guiding conductor 22. It becomes easy. In addition, the structure used as the 1st yoke 25 is also possible by forming the surrounding wall 23 of the driven rotary body 2 with a magnetic body.

  In the driving rotor 1, as shown in FIG. 9C, the magnetic resistance of the magnetic path can be reduced by arranging the second yoke 13 made of a magnetic material on the inner peripheral side of the peripheral wall. The second yoke 13 is magnetically coupled to one magnetic pole of each permanent magnet 12, suppresses leakage magnetic flux from one magnetic pole of the permanent magnet 12, and reduces the magnetic resistance of the magnetic path, thereby reducing the induction conductor 22. This contributes to an increase in the magnetic flux linked to

  The configurations shown in FIGS. 9A and 9B and the configuration shown in FIG. 9C can be combined, and by combining them, the magnetic resistance of the magnetic path can be further reduced. It becomes possible to make the maximum value of the transmission torque between 2 larger.

  By the way, since the control unit 3 controls the on / off of the switching element SW, a driving power source is necessary. Of course, power can be supplied to the control unit 3 using a separate contact, but noise may be generated and the contact may shorten the life. Therefore, as shown in FIG. 10A, a power generation conductor 26 formed in an annular shape along with the induction conductor 22 is arranged, and the magnetic flux generated by the permanent magnet 12 is linked to the power generation conductor 26 and induced. The electromotive force may be used as a power source for the control unit 3.

  In this case, the induced electromotive force generated in the power generation conductor 26 is full-wave rectified or half-wave rectified by a rectifier circuit 31 formed of a diode bridge or the like, and stored in a power storage circuit 32 using a secondary battery or a large-capacity capacitor. . The power storage circuit 32 also stabilizes the voltage. As described above, by using the power supply circuit including the rectifier circuit 32 and the storage circuit 33, it is possible to supply power to the control circuit 33 from the power supply circuit, and it is possible to drive the switching element SW without using an external power supply. Become. However, since this power supply circuit is not supplied with power to the control circuit 33 unless after the driving rotor 1 starts rotating, the switching element SW is turned on and off to start rotating the driving rotor 1, and from the power storage circuit 32. This is done after power can be supplied.

  In the configuration of FIG. 10A, the power generating conductor 26 is provided separately from the inductive conductor 22, but since induced electromotive force is also generated in the inductive conductor 22, as shown in FIG. 10B. The control circuit 33 may be fed using the induced electromotive force of the guiding conductor 22 when the switching element SW is off (when it is open). In addition, in FIG. 10, although the induction | guidance | derivation conductor 22 is connected in parallel, the structure connected in series may be sufficient.

  In the above-described configuration example, the permanent magnet 12 is provided in the driving rotor 1, and the guiding conductor 22 is provided in the driven rotating body 2, but conversely, the guiding conductor 22 is provided in the driving rotor 1; Even if it is the structure which provides the driven magnet 2 with the permanent magnet 12, it operate | moves similarly. Further, it is possible to use an electromagnet instead of the permanent magnet 12. Further, the central angle expected by the guiding conductor 22 and the number of the permanent magnets 12 and the guiding conductors 22 are not limited to the above examples.

Embodiment is shown, (a) is a longitudinal cross-sectional view, (b) is a horizontal cross-sectional view. It is a schematic block diagram same as the above. (A) (b) is a figure which shows the example of a connection of the induction | guidance | derivation conductor used for the same as the above. It is operation | movement explanatory drawing same as the above. (A) (b) is a figure which shows the other example of the induction | guidance | derivation conductor used for the same as the above. (A) is a principal part perspective view same as the above, (b) is a principal part perspective view of a comparative example. It is a principal part perspective view which shows the other structural example same as the above. (A) (b) is a perspective view which shows the structural example of the core used for the same as the above. (A) (b) (c) is a horizontal sectional view which shows another structural example same as the above. It is a figure which shows another structural example same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive rotary body 2 Driven rotary body 3 Control part 12 Permanent magnet (magnet)
13 Second yoke 22 Inductive conductor 22a Conductor pattern 22b Split conductor 24 Core 24a Magnetic thin plate 25 First yoke 26 Power generating conductor 31 Rectifier circuit 32 Power storage circuit 33 Control circuit SW Switching element

Claims (12)

A driving rotor that is the driving side and a driven rotating body that is arranged coaxially with the driving rotating body and that is the driven side, and one of the driving rotating body and the driven rotating body intersects the rotation direction in the rotation plane And the other of the driving rotating body and the driven rotating body are formed in an annular shape so that the magnetic fields generated by the magnets are interlinked during the one rotation. and a plurality of provided with induction conductor, further blocking the induced current closed to flow an induced current in the induction conductor at the timing detected by the position sensor for detecting one of the rotational position of the driving rotor and the driven rotor A torque transmission device comprising: a control unit that switches between an open state and a position sensor , wherein part of a plurality of guiding conductors is diverted. The torque transmission device according to claim 1 , wherein the guiding conductor is wound a plurality of times . 2. The torque transmission device according to claim 1 , wherein the guiding conductor is formed by laminating an annular divided conductor in a plurality of layers in the mouth axis direction . The torque transmission device according to claim 1 , wherein the induction conductor has a thickness dimension in a mouth axis direction larger than a width dimension in a plane orthogonal to the mouth axis direction in a cross section of the current path . The torque transmission device according to any one of claims 1 to 4, wherein a core made of a magnetic material is added to the inside of the guiding conductor. 6. The torque transmission device according to claim 5, wherein the core is formed of a laminated body of magnetic thin plates divided in a direction intersecting with the magnetic flux interlinking with the induction conductor . The first yoke that forms a magnetic path is added to one of the driving rotating body and the driven rotating body on the opposite side of the guiding conductor from the magnet . The torque transmission device according to any one of 6 . A core made of a magnetic material is added to the inside of the guiding conductor on one of the driving rotating body and the driven rotating body, and the guiding conductor is connected to the other of the driving rotating body and the driven rotating body. The torque according to any one of claims 1 to 4 , wherein a first yoke that forms a magnetic path is added to the opposite surface of the magnet to the magnet, and the core and the first yoke are integrated. Transmission device. One of said driven rotary member and the driving rotating body, according to claim 1, wherein the second yoke forms a magnetic path on the opposite side of said induction conductor in the magnet is added torque transmission device according to any one of 8. The torque transmission device according to claim 1 , wherein the control unit includes a switching element that switches the guiding conductor between a closed state and an open state . One of the driving rotating body and the driven rotating body includes a power generating conductor formed in an annular shape so that a magnetic field generated by the magnet is linked with the guiding conductor, and an induced electromotive force generated in the power generating conductor. 11. The torque transmission device according to claim 1, further comprising a power supply circuit that stores power and is used as a power supply for the control unit . At least partially, characterized in that it is also used as the power conductor according to claim 11 torque transmission equipment according of the induction conductor.

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