JP2019050692A - Power generation mechanism - Google Patents

Abstract

A self-generating power generation mechanism that does not require a power source is provided by using an external rotor as a component and making it possible to generate power by rotating the external rotor. The power generation mechanism includes at least a motor and an external rotor that houses the motor. The motor has a rotor and a stator, and the rotor or the stator is provided with a coil or a magnet, respectively. The external rotor rotates about the central axis, and only the stator of the motor rotates with the rotation, while the shaft and rotor of the motor do not rotate. Therefore, electric power is generated by the motor by the relative rotation between the motor coil and the magnet. [Selection] Figure 3

Description

  The present invention relates to a power generation mechanism.

  In applications that have some kind of rotating body (hereinafter referred to as an external rotor) such as a vehicle wheel or a carrier roller of a belt conveyor (for example, refer to Patent Document 1), the rotational movement of the external rotor is performed to control the rotational speed of the external rotor. It is required to detect the presence or absence of rotation and the number of revolutions.

JP, 2015-040097, A

  However, if it is intended to detect the presence or absence of the rotational movement of the external rotor and the number of rotations by wired communication, the wiring must be drawn from the external rotor, and twisting occurs in the wiring as the external rotor rotates. Therefore, although it is necessary to perform detection by wireless communication, a power supply for operating the wireless device is necessary for wireless detection.

  However, when a power supply is provided in the external rotor, replacement of the power supply and charging work are essential, and it is necessary to interrupt the rotation operation of the external rotor each time these work.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a self-power generation type power generation mechanism that does not require a power supply by using an external rotor as a component and enabling power generation by rotation of the external rotor.

  The problems are solved by the present invention described below. That is, the power generation mechanism of the present invention comprises at least a motor and an external rotor housing the motor, the motor has a rotor and a stator, and the rotor or stator is provided with a coil or a magnet, respectively. The external rotor rotates around the central axis, and along with the rotation, only the motor's stator rotates, while the motor's shaft and rotor do not rotate, and the motor generates electricity by relative rotation between the motor's coil and magnet Is performed.

  The motor's stator and the external rotor are fixed.

  According to the power generation mechanism of the present invention, only the stator of the motor rotates with the rotation of the external rotor, and a relative rotational movement occurs between the coil of the motor and the magnet. It is possible to generate an induced electromotive force by the electromagnetic induction generated by the rotation operation and to generate electric power by the motor. Therefore, since a power generation mechanism of a self-power generation type can be realized, a power supply for operating the wireless device is not necessary, and it is possible to eliminate the work such as replacement of the power supply and charging. Therefore, the presence or absence of the rotational movement of the external rotor and the detection of the number of rotations can be performed at any time according to the rotation of the external rotor, and it is possible to avoid the situation where the rotational movement of the external rotor is interrupted.

  Furthermore, since the shaft of the motor is not rotated, it is possible to completely eliminate the moment force generated by the relatively thin shaft during the rotation operation. Therefore, deformation and destruction of the shaft can be prevented, and the reliability of the power generation mechanism can be improved and the continuous operation time of the power generation mechanism can be extended.

  Furthermore, the power generation mechanism according to the present invention has the external rotor as a component, and rotates the external rotor and does not rotate the shaft of the motor. Therefore, the power generation mechanism according to the present invention can be used for applications where it is not necessary to rotate the shaft.

It is sectional drawing which shows typically the motor used for the electric power generation mechanism which concerns on Example 1 of this invention. It is sectional drawing which shows typically the motor used for the electric power generation mechanism which concerns on Example 2 of this invention. It is a fragmentary sectional view showing typically the composition of the power generation mechanism concerning the example of the present invention. It is a fragmentary sectional view which shows typically the structure which mounts a radio | wireless machine and a sensor in the electric power generation mechanism of FIG.

  The first feature of the present embodiment is that the power generation mechanism comprises at least a motor and an external rotor housing the motor, the motor has a rotor and a stator, and the rotor or stator has a coil or magnet. The outer rotor is rotated about the central axis, and only the motor stator rotates with the rotation, while the motor shaft and rotor are not rotated, and the relative position between the motor coil and the magnet is maintained. It is a power generation mechanism in which power generation is performed by a motor by rotational operation.

  The motor's stator and the external rotor are fixed. Further, the rotor and the stator in the motor have a component side that rotates when the motor is operated alone as a rotor, and a component side to be fixed as a stator.

  According to this configuration, only the stator of the motor rotates with the rotation of the external rotor, and a relative rotation occurs between the coil of the motor and the magnet. It is possible to generate an induced electromotive force by the electromagnetic induction generated by the rotation operation and to generate electric power by the motor. Therefore, since a power generation mechanism of a self-power generation type can be realized, a power supply for operating the wireless device is not necessary, and it is possible to eliminate the work such as replacement of the power supply and charging. Therefore, it is possible to detect the presence or absence of the rotational movement of the external rotor and to detect the number of rotations at any time according to the rotation of the external rotor, and to avoid the situation where the rotational movement of the external rotor is interrupted.

  Furthermore, since the shaft of the motor is not rotated, it is possible to completely eliminate the moment force generated by the relatively thin shaft during the rotation operation. Therefore, deformation and destruction of the shaft can be prevented, and the reliability of the power generation mechanism can be improved and the continuous operation time of the power generation mechanism can be extended.

  If it was attempted to increase the amount of power generation per unit time, the rotor and the stator became large, the momental force at the time of the rotation operation concerning the slender shaft also increased, and it was easy to cause breakage of the shaft. On the other hand, in order to prevent the breakage of the shaft, the shaft must also be thick, which causes the size of the power generation mechanism to be increased and the weight to be increased, resulting in a decrease in power generation efficiency per unit time.

  However, by not rotating the shaft, it is possible to eliminate the moment force generated by the relatively thin shaft during rotational operation. Therefore, deformation and destruction of the shaft can be prevented, and the reliability of the power generation mechanism can be improved and the continuous operation time of the power generation mechanism can be extended.

  Furthermore, the power generation mechanism according to the present invention has the external rotor as a component, and rotates the external rotor and does not rotate the shaft of the motor. Therefore, the power generation mechanism according to the present invention can be used for applications where it is not necessary to rotate the shaft.

  The second feature is that the shaft is fixed, or a weight is attached to the shaft, so that the power generation mechanism does not rotate the shaft.

  According to this configuration, it is possible to make the motor shaft and the rotor non-rotating in a more reliable and simple manner.

  The third feature is that the weight is attached to the shaft, and the shaft and the weight are accommodated in the outer rotor, and the weight center of the weight is not disposed on the central axis of the outer rotor.

According to this configuration, a separate part and a fixed end for fixing the motor shaft are not required, and the shaft and the weight are accommodated in the external rotor, so the structure of the power generation mechanism is simplified and miniaturized. It becomes possible.

  A fourth feature is that the motor is a power generation mechanism that is a cored motor or a coreless motor.

  According to this configuration, since the structure of the motor can be made into a versatile type, it is easy to manufacture the power generation mechanism and also to ensure the reliability of the power generation mechanism.

  The fifth feature is that the motor has a coggingless power generation mechanism.

  According to this configuration, it is possible to prevent cogging in the motor at the time of power generation (prevent the generation of cogging torque).

  A sixth feature is that the power generation mechanism is such that the central axis of the shaft and the central axis of the outer rotor are disposed on the same axis.

According to this configuration, eccentricity of the motor can be prevented when the motor is disposed in the external rotor, thereby preventing generation of rattling and vibration of the motor accompanying the rotation of the external rotor, and a power generation mechanism accompanying the rotation of the external rotor It is possible to prevent the reliability of

  A seventh feature is that the power generation mechanism rotates the stator at the same rotational speed as the external rotor.

  According to this configuration, the control of the number of revolutions generated by the motor (in particular, the number of revolutions generated by the stator) can be facilitated, and the control of the amount of power generation can be easily performed.

  An eighth feature is that the power generation mechanism includes a wireless device and a sensor.

  According to this configuration, it is possible to detect the presence or absence of the rotational operation of the external rotor, the detection of the number of rotations (rotational speed), and the detection of the generated voltage amount by wireless communication.

  The ninth feature is that the radio set and sensor are a power generation mechanism fixed to either the external rotor or the stator.

  According to this configuration, since the wireless device and the sensor rotate at the same number of revolutions as the external rotor rotates, twisting of the wiring is prevented.

  Although each Example which concerns on this invention below is described, this invention is not limited only to a following example.

Example 1
Hereinafter, the power generation mechanism 1 of the first embodiment according to the present invention and the self power generation operation by the power generation mechanism 1 will be described with reference to FIGS. 1, 3 and 4. In addition, Fig.1 (a) is AA sectional drawing of FIG.1 (b) (In FIG.1 (a), illustration of the coil 6 is abbreviate | omitted.). As shown in FIG. 3 or 4, the power generation mechanism 1 according to the first embodiment includes at least a motor 2 and an external rotor 3 housing the motor 2. In FIGS. 3 and 4, a partial cut view in which only the outer rotor 3 is cut is shown.

  The outer rotor 3 is formed in a cylindrical shape, and itself has no shaft parts. However, as described later, since the outer rotor 3 is rotated by an external force, the central axis 3a at the time of rotation is present.

  The motor 2 has a rotor 4 and a stator 5, and the rotor 4 or the stator 5 is provided with a coil 6 or a magnet 7, respectively. The motor 2 in the present embodiment is a cored DC motor with a brush 8 as shown in FIG. 1, and is provided with a coil 6 and a shaft 10 on the rotor 4 side and a magnet 7 on the stator 5 side. The rotor 4 and the stator 5 in the motor 2 are the parts that rotate when the motor 2 is operated alone are the rotor 4 and the parts that are fixed are the stator 5.

  The magnet 7 is a neodymium based magnet (Nd-Fe-B based magnet) or a samarium cobalt based magnet (SmCo based magnet), and has a magnet piece of arc-shaped cross section magnetized with N pole or S pole in the outer peripheral direction of the motor 2 The axial direction of the shaft 10 of the four shafts 10 is point-symmetrical to be provided along the side wall of the cylindrical housing case 9 in an annular shape. Therefore, the magnet 7 has a circumferential surface on the inside and a shape in which the outside is in close contact with the housing case 9. The shaft 10 is provided with a core 11, a coil 6 wound around the core 11, and a commutator 12. On one stator 5 side, a brush 8 in contact with the commutator 12, a terminal portion 13 of the motor 2 and a housing case 9 are provided.

  By making the motor 2 a cored motor, the structure of the motor 2 can be made into a versatile type. Therefore, the power generation mechanism 1 can be easily manufactured, and the reliability of the power generation mechanism 1 can be easily ensured.

  Furthermore, by making the cored motor into a coggingless structure, cogging in the motor 2 can be prevented (generation of cogging torque can be prevented) at the time of power generation. Specifically, the longitudinal direction (axial direction of the shaft 10) of the core 11 shown in FIG. 1 is formed to be inclined with respect to the axial direction of the shaft 10, or the circumferential shape in the cross section of the core 11 though not shown. In this case, the coggingless structure may be obtained by forming the unequally to the inner peripheral surface of the magnet 7. The cored motor in this embodiment is an inner rotor type as shown in FIG.

  Furthermore, the central axis of the shaft 10 and the central axis 3a of the outer rotor 3 are arranged on the same axis. By arranging the central axis of the shaft 10 and the central axis 3a on the same axis, when arranging the motor 2 in the external rotor 3, eccentricity of the motor 2 can be prevented. Therefore, generation of rattling and vibration of the motor 2 accompanying the rotation of the external rotor 3 is prevented, and a decrease in reliability of the power generation mechanism 1 accompanying the rotation of the external rotor 3 can be prevented.

  One end of the shaft 10 is fixed to a fixed end (not shown), or a weight 14 is attached to one end of the shaft 10 as shown in FIG. Further, the stator 5 and the external rotor 3 are fixed by press-fitting the motor 2 to the overhanging portion 3 b formed on the external rotor 3 as shown in FIG. 3. By fixing the outer rotor 3 and the stator 5, the outer rotor 3 is rotatably disposed. The overhanging portion 3 b is integrally formed so as to overhang in the inner diameter direction of the outer rotor 3. Furthermore, the inside of the overhanging portion 3 b is formed in accordance with the outer shape of the housing case 9 of the motor 2.

  Furthermore, the power generation mechanism 1 of the present embodiment includes a radio 16 and a sensor 17 as shown in FIG. The radio 16 is electrically connected to the motor 2 by the feed wire 15, and the sensor 17 is electrically connected to the radio 16. Examples of the sensor 17 include a sensor that detects a change in pressure or temperature generated inside the external rotor 3 with rotation. The wireless device 16 and the sensor 17 are fixed to either the external rotor 3 or the stator 5 of the motor 2. In the present embodiment, the wireless device 16 and the sensor 17 are fixed on the inner circumferential surface of the outer rotor 3 as shown in FIG.

  Next, the operation principle of self-power generation in the power generation mechanism 1 will be described. When an external force is applied and the external rotor 3 rotates about the central axis 3a, only the stator 5 of the motor 2 rotates with the rotation. On the other hand, the shaft 10 and the rotor 4 of the motor 2 do not rotate because the shaft 10 is fixed or the weight 14 is attached to the shaft 10.

  Therefore, the magnet 7 provided on the stator 5 side rotates with respect to the coil 6 on the rotor 4 side, and by this rotation operation, an electromagnetic induction acts between the magnetic field of the magnet 7 and the coil 6 to cause an induced electromotive force. Occurs and the motor 2 generates power. Therefore, in the present embodiment, the operation of rotating only the magnet 7 with respect to the non-rotating coil 6 is a relative rotation operation between the coil 6 of the motor 2 and the magnet 7, and this relative rotation causes the motor 2 to generate power. To be done.

  In the example of FIG. 3, the position energy of the extent that the rotor 4 and the shaft 10 of the motor 2 do not rotate with respect to the size of the motor 2 and the induced electromotive force (V) generated by electromagnetic induction when the stator 5 of the motor 2 rotates J) may be formed by the weight 14. The material and dimensions of the weight 14 and the position of the center of gravity 14a are set to such an extent that the potential energy can be formed. The center of gravity position 14a of the weight 14 is not disposed on the center axis 3a of the outer rotor 3. In the example of FIG. 3, the center of gravity position 14a is below the center axis 3a (ie, in the center axis direction of the shaft 10). The size or the like of the weight 14 is set so as to be positioned.

  One end of the shaft 10 is fixed to a fixed end (not shown), or the weight 14 is attached to one end of the shaft 10 as shown in FIG. It is possible to make the rotor 4 non-rotating.

  Further, since the external rotor 3 and the stator 5 of the motor 2 are fixed, the stator 5 is rotated at the same rotational speed as the external rotor 3. Therefore, management of the number of rotations generated by the motor 2 (in particular, the number of rotations generated by the stator 5) is facilitated, and control of the amount of generated power can also be easily performed.

As shown in FIG. 3 or 4, weight 14 is attached to shaft 10, and
More preferably, the shaft 10 and the weight 14 are accommodated in the outer rotor 3 and the center of gravity (the position of the center of gravity 14a) of the weight 14 is not disposed on the central axis 3a of the outer rotor 3. The reason is that there is no need for a separate part or a fixed end for fixing the shaft 10 of the motor 2 and the shaft 10 and the weight 14 are housed in the external rotor 3, so that the structure of the power generation mechanism 1 is simplified. This is because miniaturization is possible.

  The electric power generated by the electric power generation of the motor 2 is supplied to the wireless device 16 through the feed wire 15, and it becomes possible to activate the wireless device 16 such as infrared rays and the sensor 17 which can be optionally installed separately. With the wireless device 16 and the sensor 17, it is possible to detect the presence or absence of the rotational operation of the external rotor 3, the detection of the number of rotations (rotational speed), and the detection of the generated voltage amount by wireless communication.

  It is preferable that the radio 16 and the sensor 17 be fixed to either the external rotor 3 or the stator 5. The reason is that since the wireless device 16 and the sensor 17 rotate at the same number of revolutions as the external rotor 3 rotates, twisting of the wiring is prevented.

  The number of revolutions (rotational speed) of the external rotor 3 changes according to the application for which the power generation mechanism 1 is used, and even if the number of revolutions of the external rotor 3 is the same, the back electromotive force constant Ke (mV / rpm) of the motor 2 The design of this also changes the voltage generated. Ke or the like may be set so that the voltage value to be generated can be maintained at or above the operation voltage value (for example, 3 V) of the wireless device 16 and the sensor 17.

  According to the power generation mechanism 1 of the present embodiment described above, only the stator 5 of the motor 2 rotates with the rotation of the external rotor 3, and a relative rotational movement occurs between the coil 6 of the motor 2 and the magnet 7. It is possible to generate an induced electromotive force by the electromagnetic induction generated by the rotation operation and to generate electric power by the motor 2. Therefore, since the power generation mechanism 1 of the self-power generation type can be realized, the power supply for operating the wireless device 16 becomes unnecessary, and the work of replacing the power supply, charging and the like can be completely eliminated. Therefore, it is possible to detect the presence or absence of the rotational movement of the external rotor 3 and to detect the number of rotations at any time along with the rotation of the external rotor 3 and to avoid the situation where the rotational movement of the external rotor 3 is interrupted. .

  Furthermore, since the shaft 10 of the motor 2 is not rotated, it is possible to completely eliminate the moment force generated by the relatively thin shaft 10 during the rotation operation. Therefore, deformation and breakage of the shaft 10 can be prevented, and the reliability of the power generation mechanism 1 can be improved and the continuous operation time of the power generation mechanism 1 can be extended.

  When it is attempted to increase the amount of power generation per unit time, the rotor 4 and the stator 5 become large, and the momental force at the time of the rotation operation relative to the slender shaft 10 also increases, and the shaft 10 is easily damaged. On the other hand, in order to prevent the breakage of the shaft 10, the shaft 10 must also be thick, resulting in an increase in size and weight of the power generation mechanism 1 and a decrease in power generation efficiency per unit time.

  However, by not rotating the shaft 10, it is possible to eliminate the moment force generated by the relatively thin shaft 10 at the time of rotational operation. Therefore, deformation and breakage of the shaft 10 can be prevented, and the reliability of the power generation mechanism 1 can be improved and the continuous operation time of the power generation mechanism 1 can be extended.

  Furthermore, the power generation mechanism 1 has the external rotor 3 as a component, and rotates the external rotor 3 and does not rotate the shaft 10 of the motor 2. Therefore, the power generation mechanism 1 can be used for applications where it is not necessary to rotate the shaft 10.

  The power generation mechanism 1 is applicable to fields such as vehicles in which the outer rotor 3 is a wheel, and belt conveyors in which the outer rotor 3 is a carrier roller.

  The power generation mechanism 1 according to the present embodiment can be variously changed according to the technical idea thereof. For example, the motor 2 can be replaced by a brushless motor. When the brushless motor is provided in the power generation mechanism 1, magnets are provided on the rotor side and coils are provided on the stator side. Therefore, in such a modification, the operation of rotating only the coil with respect to the non-rotating magnet is the relative rotation of the motor coil and the magnet. The motor 2 may be an AC motor or an outer rotor type motor. Alternatively, the wireless device 16 and the sensor 17 may be attached to the stator 5 of the motor 2.

(Example 2)
Next, a power generation mechanism 18 according to a second embodiment of the present invention will be described with reference to FIGS. The same reference numerals as in the first embodiment denote the same parts, and a redundant description will be omitted or simplified.

  The second embodiment differs from the first embodiment in that the motor 19 in the present embodiment is a coreless DC motor with a brush 20 as shown in FIG. Also in this embodiment, the coil 22 and the shaft 23 are provided on the rotor 21 side, and the magnet 25 is provided on the stator 24 side. The rotor 21 and the stator 24 in the motor 19 have a component side that rotates when the motor 19 is operated alone as the rotor 21 and a component side to be fixed as the stator 24.

  In the example of FIG. 2, the motor 19 is a hollow cylindrical coreless motor. Furthermore, the motor 19 is a rotor comprising a cylindrical coil 22, a support 26 of the coil 22, a commutator 27 formed on the support 26, and a shaft 23 fixed to the support 26 through the center of the support 26. It has 21. Further, the coreless motor in this embodiment is an inner rotor type as shown in FIG.

  Furthermore, the shaft 23 is supported by a bearing 29 a which is inserted into the hollow cylindrical magnet 25 and is disposed at one end of the cylindrical housing case 28 and a bearing 29 b disposed at the other end of the housing case 28. It is done.

  The magnet 25, the brush 20 in contact with the commutator 27, the terminal portion 30 of the motor 19, and the housing case 28 are provided on one stator 24 side. The magnet 25 is an Nd-Fe-B based magnet or a SmCo based magnet, and the outer periphery or the inner periphery is multipolar-magnetized with the number of poles p (p is an even number of 4 or more).

  By making the motor 19 a coreless motor, the structure of the motor 19 can be made a versatile type. Therefore, the power generation mechanism 18 can be easily manufactured, and the reliability of the power generation mechanism 18 can be easily ensured.

  Furthermore, the motor 19 can be made into a coggingless structure, and cogging with the motor 19 can be prevented at the time of power generation. When a cored motor is used for the power generation mechanism 18 as in the first embodiment, the motor type and structure must be changed to a coggingless structure. Therefore, the coreless motor is more preferable in that the coggingless structure can be achieved despite the versatile type.

  The central axis of the shaft 23 and the central axis 3a of the outer rotor 3 are disposed on the same axis. Therefore, when arranging the motor 19 in the external rotor 3, eccentricity of the motor 19 is prevented, and generation of rattling and vibration of the motor 19 accompanying rotation of the external rotor 3 is also prevented, and a power generation mechanism accompanying rotation of the external rotor 3 It becomes possible to prevent the reliability deterioration of 1.

  The shaft 23 is fixed to a fixed end (not shown) at one end as in the first embodiment, or a weight 14 is attached to one end of the shaft 23 as shown in FIG. Further, the housing case 28 forming the stator 24 is press-fit into the projecting portion 3 b, and the motor 19 is fixed to the outer rotor 3.

  Next, the operation principle of self-power generation in the power generation mechanism 18 will be described. When the external rotor 3 rotates, only the stator 24 of the motor 19 rotates with the rotation. On the other hand, the shaft 23 and the rotor 21 do not rotate because the shaft 23 is fixed or the weight 14 is attached to the shaft 23.

  Therefore, the magnet 25 rotates with respect to the coil 22, and by this rotation operation, electromagnetic induction acts between the magnetic field of the magnet 25 and the coil 22, an induced electromotive force is generated, and power generation occurs in the motor 19. Therefore, in the present embodiment, the operation of rotating only the magnet 25 with respect to the non-rotating coil 22 is a relative rotation operation between the coil 22 of the motor 19 and the magnet 25, and this relative rotation causes the motor 19 to generate power. To be done.

  In the example of FIG. 3, the weight 14 is the position energy (J) that does not rotate the rotor 21 and the shaft 23 with respect to the size of the motor 19 and the induced electromotive force (V) generated by electromagnetic induction when the stator 24 rotates. It is good if it can be formed. The material and dimensions of the weight 14 and the position of the center of gravity 14a are set to such an extent that the potential energy can be formed.

  The number of rotations (rotational speed) of the external rotor 3 changes according to the application for which the power generation mechanism 18 is used, and even if the number of rotations of the external rotor 3 is the same, the back electromotive force constant Ke (mV / rpm) of the motor 19 The design of this also changes the voltage generated. It is sufficient to set Ke or the like so that the voltage value to be generated is ensured to be equal to or higher than the operation voltage value of the wireless device 16 and the sensor 17.

  According to the power generation mechanism 18 of the present embodiment as described above, relative rotation operation is generated between the coil 22 of the motor 19 and the magnet 25 with the rotation of the external rotor 3, and the motor is generated by the electromagnetic induction generated by this rotation operation. It becomes possible to generate electricity at 19. Therefore, the power supply for operating the wireless device 16 is not required, the presence or absence of the rotational operation of the external rotor 3 and the detection of the number of rotations can be performed at any time, and the situation where the rotational operation of the external rotor 3 is interrupted can be avoided.

  Furthermore, since the shaft 23 of the motor 19 is not rotated, it is possible to completely eliminate the moment force generated by the relatively thin shaft 23 during the rotation operation, and it is possible to prevent the deformation or destruction of the shaft 10. Therefore, the reliability of the power generation mechanism 18 can be improved and the continuous operation time can be extended. Also, the power generation mechanism 18 can be used for applications where it is not necessary to rotate the shaft 23.

  The power generation mechanism 18 according to the present embodiment can be variously changed according to the technical concept, and for example, the motor 19 can be replaced by a brushless motor. When the brushless motor is provided in the power generation mechanism 18, a magnet is provided on the rotor side and a coil is provided on the stator side. Therefore, in such a modification, the operation of rotating only the coil with respect to the non-rotating magnet is the relative rotation of the motor coil and the magnet. The motor 19 may be an AC motor or an outer rotor type motor. Alternatively, the wireless device 16 and the sensor 17 may be attached to the stator 24 of the motor 19.

  In addition, the fixing method of the external rotor 3 and the motors 2 and 19 is not limited to the press injection of the motors 2 and 19 to the overhang part 3b demonstrated in the present Example. Specifically, the housing case 9 or 28 may be adhered to the inner peripheral surface of the outer rotor 3 instead of the press-fit, or the housing case 9 or 28 may be attached to the outer rotor 3 with a slotted set screw (so-called immo screw). It may be fixed to

1, 18 Power generation mechanism 2, 19 Motor 3 External rotor
3a Center axis of external rotor
3b overhanging portion 4, 21 motor rotor 5, 24 motor stator 6, 22 coil 7, 25 magnet 8, 20 brush 9, 28 housing case
10, 23 shafts
11 cores
12, 27 Commutator
13, 30 Motor terminal part
14 weight
14a Center of gravity position of weight
15 feeding wire
16 radio
17 sensors
26 Support
29a, 29b bearings

Claims (9)

The power generation mechanism comprises at least a motor and an external rotor housing the motor,
The motor has a rotor and a stator, and the rotor or stator is provided with a coil or a magnet, respectively.
The external rotor rotates around the central axis, and along with the rotation, only the motor's stator rotates, while the motor's shaft and rotor do not rotate, and the motor generates electricity by relative rotation between the motor's coil and magnet The power generation mechanism that takes place.   The power generation mechanism according to claim 1, wherein the shaft is not rotated by fixing the shaft or attaching a weight to the shaft.   The power generation mechanism according to claim 2, wherein the weight is attached to the shaft, the shaft and the weight are housed in the external rotor, and the center of gravity of the weight is not disposed on the central axis of the external rotor.   The power generation mechanism according to any one of claims 1 to 3, wherein the motor is a cored motor or a coreless motor.   The power generation mechanism according to claim 4, wherein the motor is a coggingless structure.   The power generation mechanism according to any one of claims 1 to 5, wherein the central axis of the shaft and the central axis of the outer rotor are disposed on the same axis.   The power generation mechanism according to any one of claims 1 to 6, wherein the stator rotates at the same rotation speed as the external rotor.   The power generation mechanism according to any one of claims 1 to 7, comprising a wireless set and a sensor.   The power generation mechanism according to claim 8, wherein the wireless device and the sensor are fixed to either the external rotor or the stator.

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