JP2007100774A - Power generation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To extend the service life of each component of a transmission by suppressing a repeating phenomenon of shift operation in the transmission of a power generation device. <P>SOLUTION: ON/OFF operation of an electromagnetic clutch 34 is not performed until a delay time t (15 seconds, for example) has passed even when an engine 1 is in a decelerating trend and is less than the threshold value of the transmission 3 (the rotating speed is 900 rpm, for example). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power generation device, and more particularly to a power generation device used mainly for ships, in which a generator is driven by using rotation of an engine.

  In ships such as fishing boats, electric power is usually supplied to electric equipment such as a fish finder, radar, and sonar by driving a generator using the rotation of the engine. However, in the case of a 1 KW generator, for example, the rotation range in which the generator can generate electric power is in the range of about 1,000 to 4,000 rpm, whereas in the case of a small vessel, the rotation of the engine is about 500 to 2, Since it was in the range of 500 rpm, when the engine was rotating at a low speed of 1,000 rpm or less, the generator could not generate power.

In view of this, the present applicant has provided a transmission between the engine output shaft and the generator input shaft so that power can be generated not only when the engine is rotating at a high speed but also when the engine is rotating at a low speed. It has been proposed to control the transmission so that the rotational speed of the shaft is within a predetermined range (Patent Document 1). As a result, it has become possible to reduce the number of loaded batteries, which has been a major factor in reducing the fuel consumption of ships and reducing the comfort and workability.
Utility model registration No. 3097549

  However, in the case of a fishing boat, for example, the increase and decrease may be repeated when the engine speed is around 1,000 rpm depending on the fishing method and the operator. In such a case, if the shift threshold value in the transmission is within the range of increase / decrease, a phenomenon in which the shift of the transmission is repeated (shift repeat phenomenon) occurs, and the components of the clutch and the like used in the transmission Problems such as shortening the service life occur.

  FIG. 4 is an explanatory diagram of the shift repetition phenomenon of such a transmission. FIG. 4A shows the change over time of the engine speed, and FIG. 4B shows the change over time of ON / OFF of the electromagnetic clutch in the transmission. The transmission ratio of the transmission is four times when the electromagnetic clutch is on and doubles when the electromagnetic clutch is off. In this transmission, when the engine is started and the rotational speed is 1,200 rpm or less, the electromagnetic clutch is turned on and the gear ratio is quadrupled. When the engine speed exceeds 1,200 rpm, the electromagnetic clutch is turned off, and the gear ratio is increased from 4 times to 2 times. On the other hand, when the engine is decelerated and the rotational speed is 900 rpm or less, the electromagnetic clutch is turned on and the gear ratio is doubled to quadrupled.

  When the fishing boat leaves the port, it goes to the fishing ground at full speed ((a) → (b) → (c) in the figure (a)). Upon arrival at the fishing ground, the speed is reduced ((c) → (d)), and fishing is performed according to a predetermined fishing method ((d) → (e)). At this time, the engine speed increases or decreases within a range including 900 rpm and 1,200 rpm. For this reason, as shown in FIG. 4B, the electromagnetic clutch is frequently turned on and off repeatedly, and the electromagnetic clutch is consumed heavily.

  The present invention has been made in view of such a conventional problem, and an object of the present invention is to suppress a shift repetition phenomenon in the transmission of the power generation apparatus and extend the life of each component of the transmission.

  In order to achieve the above object, the power generator of the present invention is interposed between a generator, an output shaft of the engine, and an input shaft of the generator, and the rotational speed from the output shaft is changed in multiple stages to change the speed. A transmission for transmitting to the input shaft, a control means for controlling the transmission, and a measuring means for measuring the rotational speed of the output shaft or the input shaft are provided, and the rotational speed of the output shaft becomes a predetermined value or less. When increasing the gear ratio of the apparatus, the operation of changing the gear ratio is delayed for a predetermined time.

  In the case of a power generation device for ships, when the engine speed is increasing, the output shaft speed becomes more than a predetermined value because there is little increase / decrease in the low speed range and the phenomenon of repeated gear shifting is unlikely to occur. Sometimes it is desirable to immediately reduce the gear ratio of the transmission.

  Further, from the viewpoint of reducing the size and weight of the device, as a transmission, at least 2 connected to the output shaft of the engine, to which the at least one pulley is attached, and to the input shaft of the generator. A pulley having two pulleys attached thereto, the pulley of the first rotary shaft and the pulley of the second rotary shaft being connected directly or indirectly by a belt or a chain, and the pulley attached to the second rotary shaft Among these, it is preferable to select a pulley that transmits rotation to the second rotation shaft, thereby changing the rotation speed from the output shaft of the engine in multiple stages and transmitting it to the generator.

  Here, from the viewpoint of further simplifying the structure of the transmission, two pairs of pulleys are attached to the first rotating shaft and the second rotating shaft, and one pulley pair is attached to the rotating shaft via an electromagnetic clutch. A pulley pair may be attached to the rotating shaft via a one-way clutch, and a pulley that transmits rotation to the second rotating shaft may be selected by turning on and off the electromagnetic clutch.

  Alternatively, from the viewpoint of increasing the margin of attachment of the transmission to the output shaft of the engine, a third rotating shaft to which at least two pulleys are attached is further provided, and one of these pulleys is a pulley of the first rotating shaft. The other one or more pulleys may be connected to the pulley of the second rotating shaft. At this time, two pairs of pulleys are attached to the second rotating shaft and the third rotating shaft, one pulley pair is attached to the rotating shaft through an electromagnetic clutch, and the other pulley pair is rotated through the one-way clutch. A pulley that is attached to the shaft and transmits rotation to the second rotating shaft by turning on and off the electromagnetic clutch may be selected.

  In the power generator of the present invention, when the rotational speed of the output shaft of the engine is less than a predetermined value and the speed ratio of the transmission is increased, the operation for increasing the speed ratio is delayed for a predetermined time. Even if the threshold value is within the range of increase / decrease of the engine speed, it is possible to suppress the shift repetition phenomenon in the transmission and to extend the life of each component of the transmission.

  In addition, when the speed of the output shaft exceeds a predetermined value, the speed ratio of the generator can be quickly reduced to a suitable range by reducing the gear ratio of the transmission immediately. You can do it.

  In addition, the transmission is connected to the output shaft of the engine, the first rotating shaft to which at least one pulley is attached, and the second rotating shaft to which the at least two pulleys are connected, which is connected to the input shaft of the generator. The pulley of the first rotating shaft and the pulley of the second rotating shaft are directly or indirectly connected by a belt or a chain, and rotate from the pulley attached to the second rotating shaft to the second rotating shaft. By selecting the pulley that transmits the power, the number of revolutions from the output shaft of the engine is changed in multiple stages and transmitted to the generator, so that the device can be reduced in size and weight.

  At this time, when two pulley pairs are attached to the two rotating shafts, one pulley pair is attached to the rotating shaft via an electromagnetic clutch, and the other pulley pair is attached to the rotating shaft via a one-way clutch. The structure of the device can be further simplified. Further, a third rotating shaft to which at least two pulleys are attached is further provided, one of these pulleys is connected to the pulley of the first rotating shaft, and the other one or more pulleys are connected to the pulley of the second rotating shaft. If the connection is made, the margin for attaching the transmission to the output shaft of the engine increases. Furthermore, two pairs of pulleys are attached to the second rotating shaft and the third rotating shaft, one pulley pair is attached to the rotating shaft via an electromagnetic clutch, and the other pulley pair is attached to the rotating shaft via a one-way clutch. If the pulley which attaches to and selects the pulley which transmits rotation to the 2nd axis of rotation by turning on and off of an electromagnetic clutch, the structure of an apparatus can be simplified.

  Hereinafter, the power generator of the present invention will be described with reference to the drawings. The present invention is not limited to these embodiments.

A schematic diagram showing an embodiment of a power generator according to the present invention is shown in FIG. The power generation device of FIG. 1 includes a transmission (transmission device) 3 including a first rotation shaft 31 and a second rotation shaft 32 supported by support members 36a and 36b arranged to face each other, a generator 2 Is provided. Three pulleys a ₂ , b ₁ , and c ₁ are attached to the first rotating shaft 31. Specifically, the pulleys a ₂ and b ₁ are fixed to the first rotating shaft 31, and the pulley c ₁ is attached to the first rotating shaft 31 via the electromagnetic clutch 34. Three pulleys d ₁ , b ₂ , and c ₂ are also attached to the second rotating shaft 32. Here, the pulleys d ₁ and c ₂ are fixed to the second rotating shaft 32, and the pulley b ₂ is attached to the second rotating shaft 32 via the one-way clutch 35. The one-way clutch 35, when the rotational speed of the pulley b ₂ is faster than the rotational speed of the second rotating shaft 32, convey the power of the pulley b ₂ to the second rotary shaft 32, the rotational speed of the pulley b ₂ opposite the first 2 when slower than the rotational speed of the rotary shaft 32 operates so as not to convey the power of the pulley b ₂ to the second rotary shaft 32.

Between the pulley a ₂ pulleys a ₁ and the first rotation shaft 31 attached to the output shaft 11 of the engine 1 the belt B ₁ is being hung, the rotation of the output shaft 11 of the engine 1 via the belt B ₁ Is transmitted to the first rotation shaft 31. Similarly, belts B ₂ and B ₃ are also suspended between the pulleys b ₁ and c ₁ of the first rotating shaft 31 and the pulleys b ₂ and c ₂ of the second rotating shaft 32, respectively. Is transmitted to the second rotation shaft 32. The rotation of the second rotary shaft 32 by a belt B ₄ which is hung between the pulleys d ₁ and a pulley d ₂ which is mounted on the input shaft 21 of the generator 2 of the second rotary shaft 32 of the generator 2 The power is transmitted to the input shaft 21 and is generated in the generator 2.

In the power generation device having such a configuration, when the output shaft 11 rotates by the operation of the engine 1, the pulley a ₁ rotates, and this rotation is transmitted to the pulley a ₂ via the belt B ₁ and the first rotating shaft 31 rotates. . When the first rotating shaft 31 rotates, the pulley b ₁ fixed to the first rotating shaft 31 rotates, the pulley b ₂ also rotates by the belt B ₂ , and the second rotating shaft 32 is rotated via the one-way clutch 35. Rotate. On the other hand, when the electromagnetic clutch 34 is turned on, the pulley c ₁ also rotates together with the first rotating shaft 31. Then, the rotation of the pulley c ₁ is transmitted to the pulley c ₂ via the belt B ₃ and the second rotating shaft 32 rotates.

In this transmission, the diameter ratio between the pulley b ₁ and the pulley b ₂ is 1: 1, and the diameter ratio between the pulley c ₁ and the pulley c ₂ is 2: 1. That is, the number of rotations of the second rotating shaft 32 is doubled in the drive transmission by the pulleys b ₁ and b ₂ and doubled in the drive transmission by the pulleys c ₁ and c ₂ . As described above, since the pulley b ₂ is attached to the second rotary shaft 32 through the one-way clutch, the rotation of the second rotary shaft 32 is faster than the rotation of the pulley b _2, the pulley b ₂ is idled To do. Therefore, when the electromagnetic clutch 34 is turned on, the drive is transmitted to the second rotating shaft 32 by the pulley c ₁ and the pulley c _2, and the number of rotations thereof is doubled. Instead of using a one-way clutch 35, the pulley b ₁ is provided an electromagnetic clutch may be switched to a pulley for drive transmission by ON · OFF of the electromagnetic clutch. However, it is recommended to use a one-way clutch from the viewpoint of ease of assembly and control.

When the second rotating shaft 32 rotates, the pulley d ₁ rotates thereby, and the pulley d ₂ rotates by the belt B ₄ hung on the pulley d ₁ and the input shaft 21 of the generator 2 rotates. Here, in this power generator, the diameter ratio between the pulley d ₁ and the pulley d ₂ is set to 2: 1. As a result, the rotational speed of the input shaft 21 is twice that of the second rotational shaft 32. Therefore, the rotational speed of the input shaft 21 is twice that of the output shaft 11 of the engine 1 when the electromagnetic clutch 34 is not operated and four times when the electromagnetic clutch 34 is operated.

  As described above, in this power generation device, the rotational speed of the input shaft 21 of the generator 2 with respect to the output shaft 11 of the engine 1 can be switched between two times and four times. The diameter ratio may be appropriately selected to obtain a suitable magnification. In addition, which pulley pair is used to increase the rotation magnification may be appropriately determined from the installation location of the apparatus and the magnification. The number of pulley pairs attached to the first rotating shaft and the second rotating shaft is not limited, and as the number of attached pulley pairs increases, the selectable magnification increases and finer rotation control of the input shaft can be performed.

  The generator has a three-phase star-shaped stator coil. When the input shaft 21 of the generator is rotated by the operation of the engine 1, a rotor magnet (not shown) attached to the input shaft 21 is rotated. A three-phase AC voltage having a phase shift of 2π / 3 is generated in the phase stator coil. The generated AC voltage is applied to a rectifier (not shown) where it is converted to a DC voltage. A direct current is output from the rectifier to the battery, and charging is performed.

  Next, rotation control of this power generator will be described. FIG. 2 shows an example of a block diagram of the power generator of FIG. The rotational speed of the output shaft 11 of the engine 1 is measured by a sensor (measuring means) S and sent to the control means 4. When the rotational speed of the output shaft 11 is 1,200 rpm or less, an ON signal is output from the control means 4 to the electromagnetic clutch 34, and the rotational speed of the output shaft is quadrupled and transmitted to the input shaft 21. When the rotational speed of the output shaft 11 exceeds 1,200 rpm, an OFF signal is output from the control means 4 to the electromagnetic clutch 34, and the rotational speed of the output shaft 11 is doubled and transmitted to the input shaft 21. On the other hand, when the rotational speed of the output shaft 11 decreases to 900 rpm or less, an ON signal is sent from the control means 4 to the electromagnetic clutch 34. However, the ON signal is sent to the electromagnetic clutch 34 after a predetermined time elapses, for example, 15 seconds later by the action of the delay circuit 5, and the electromagnetic clutch 34 is turned ON. Thereby, the repetition of the ON / OFF operation of the electromagnetic clutch 34 is suppressed.

  Note that the delay time is preferably set to be equal to or longer than the time during which the increase / decrease in the rotation speed is settled by grasping the state where the increase / decrease in the rotation speed of the output shaft 11 is repeated. Further, the threshold value of the rotational speed of the output shaft 11 for shifting the transmission 3 may be appropriately determined from a suitable rotational range of the input shaft 21 of the generator 2, the gear ratio of the transmission 3, and the like.

  FIG. 3 is a flowchart showing an example of control of the power generation device of FIG. When the engine 1 is driven, it is determined whether the rotational speed of the engine 1 is 300 rpm or less (step S101). If the rotational speed of the engine 1 exceeds 300 rpm, it is next determined whether or not the engine 1 is stopped (step S102). If the engine 1 is not stopped, the electromagnetic clutch 34 is turned on and the output shaft 11 is turned on. Is rotated four times by the transmission 3 and transmitted to the input shaft 21 of the generator 2 (step S103). Next, it is determined whether the rotational speed of the engine 1 exceeds 1,200 rpm (step S104). If the rotation speed of the engine 1 is 1,200 rpm or less, steps S102 and S103 are performed and the electromagnetic clutch 34 remains ON. On the other hand, when the rotational speed of the engine 1 exceeds 1,200 rpm (step S104), the electromagnetic clutch 34 is turned off and the rotational speed of the engine 1 is doubled by the transmission 3 and transmitted to the input shaft 21 of the generator 2. (Step S105).

  Next, it is determined whether the rotational speed of the engine 1 is 900 rpm or less (step S106). When the rotational speed of the engine 1 exceeds 900 rpm, the electromagnetic clutch 34 remains in the OFF state. On the other hand, when the rotational speed of the engine 1 becomes 900 rpm or less, the timer t is started (step S107), and the OFF state of the electromagnetic clutch 34 is maintained until the timer t reaches 15 seconds (step S108). When the timer t has elapsed for 15 seconds, it is determined whether the engine has stopped (step S102), and then the electromagnetic clutch 34 is turned on (step S103). As a result, the rotational speed of the output shaft 11 is quadrupled by the transmission 3 and transmitted to the input shaft 21 of the generator 2. Further, it is determined whether or not the rotational speed of the engine 1 exceeds 1,200 rpm (step S104). When the rotational speed of the engine 1 exceeds 1,200 rpm, the above steps are repeated. On the other hand, if the engine 1 is stopped during this time (step S102), the electromagnetic clutch is turned off (step S109), and the control ends.

  FIG. 4 is a diagram showing the relationship between the engine speed and the ON / OFF control of the electromagnetic clutch. FIG. 4A is a diagram showing the change over time of the engine speed. FIG. 4B is an operation diagram of a conventional transmission, and FIG. 4C is an operation diagram of a transmission used in the present invention. As described above, in the conventional transmission, when the engine speed is increased or decreased within a range including 900 rpm, a shift repetition phenomenon in which the ON / OFF of the electromagnetic clutch is frequently repeated occurs, and the consumption of the electromagnetic clutch becomes severe. On the other hand, as shown in FIG. 5C, in the transmission used in the present invention, even if the engine speed increases or decreases within the range including 900 rpm, the electromagnetic clutch ON / OFF delay time t elapses. Since this is not done until it is done, the repeated shift phenomenon is effectively suppressed.

Next, another embodiment of the power generator according to the present invention is shown in FIG. In the transmission of this embodiment, the number of rotating shafts is three in order to increase the mounting tolerance of the power generator. If only the simplification of the structure of the transmission is considered, it is preferable to use two rotating shafts as in the above embodiment. However, the present situation is that there is not enough space in the vicinity of the engine of the ship to attach the power generation device, and it is necessary to devise the installation location of the power generation device for each ship. Therefore, in the transmission according to this embodiment, the number of rotation shafts is increased to one, and the number of rotation shafts is increased to three. The rotation shaft of the transmission connected to the output shaft of the engine is not attached with an electromagnetic clutch or one-way clutch that is difficult to attach and detach. Thus, the pulley can be easily attached to and detached from the rotating shaft. Specifically, as shown in FIG. 5, the pulley a ₂ connected to the pulley a ₁ attached to the output shaft 11 of the engine 1 is easily attached to and detached from the first rotating shaft 31, thereby The mounting position can be easily shifted in the output shaft direction of the engine 1.

Hereinafter, the structure of the power generation device of FIG. 5 will be described. The transmission 3 ′ of the power generation device includes three rotating shafts 31, 32, and 33. The three rotary shafts 31, 32, and 33 are rotatably supported by support members 36a and 36b that are arranged to face each other. Two pulleys a ₂ and b ₁ are fixed to the first rotating shaft 31. Pulleys c ₂ and d ₁ are fixed to the second rotating shaft 32, and the pulley b ₃ is attached via a one-way clutch 35. A pulley b ₂ is fixed to the third rotating shaft 33, and the pulley c ₁ is attached via an electromagnetic clutch 34. Similar to the above embodiment, the one-way clutch 35, when the rotational speed of the pulley b ₃ is faster than the rotational speed of the second rotating shaft 32, convey rotational power of the pulley b ₃ to the second rotating shaft 32, the opposite rotational speed of the pulley b ₃ is at slower than the rotational speed of the second rotary shaft 32 operates so as not convey rotational power of the pulley b ₃ to the second rotating shaft 32.

Belt B ₁ between the pulley a ₂ pulleys a ₁ and the first rotation shaft 11 attached to the output shaft 11 of the engine 1 is hung, the rotation of the output shaft 11 of the engine 1 via a belt B ₁ This is transmitted to the first rotating shaft 11. Further, the pulley b ₂ of the pulley b ₁ and the third rotation shaft 33 of the first rotary shaft 11, the belt B ₂ between the pulley b ₃ of the second rotary shaft 32 is hung, the rotation of the first rotary shaft 11 Is simultaneously transmitted to the third rotating shaft 33 and the second rotating shaft 32. On the other hand, the pulley c ₁ and the belt B ₃ also between the pulley c ₂ of the second rotary shaft 32 of the third rotary shaft 33 is hung so that the rotation of the third rotation shaft 33 is transmitted to the second rotating shaft 32 It has become. Then, the belt B ₄ which is hung between the pulleys d ₂ which is mounted on the input shaft 21 of the pulley d ₁ and the generator 2 of the second rotating shaft 32, rotation of the second rotary shaft 32 is the generator 2 To the input shaft 21 and the generator 2 generates power.

The diameter ratio of each pulley is as follows: a ₁ : a ₂ = 1: 1, pulley b ₁ : b ₂ : b ₃ = 1: 1: 1, pulley c ₁ : c ₂ = 2: 1, pulley d ₁ : d ₂ = 2: 1. Therefore, the rotational speed of the input shaft 21 of the generator 2 with respect to the rotational speed of the engine 1 is doubled in the drive transmission by the pulleys b ₁ , b ₂ , b ₃ and is four times in the drive transmission by the pulleys c ₁ , c _2. Become. Switching between the two-fold or four-fold rotation speed transmitted to the input shaft 21 of the generator 22 is performed by turning on and off the electromagnetic clutch 34 as in the above embodiment. That is, when the electromagnetic clutch 34 is turned off, the pulley c ₁ does not rotate, so the second rotating shaft 32 rotates by drive transmission by the pulleys b ₁ , b ₂ , b ₃ , and the generator 2 with respect to the rotational speed of the engine 1 is rotated. The rotational speed of the input shaft 21 is doubled. On the other hand, when the electromagnetic clutch 34 is turned ON, the pulley c ₁ rotates together with the third rotating shaft 33, and the second rotating shaft 32 rotates by drive transmission by the pulleys c ₁ and c ₂ . Thereby, the rotation speed of the input shaft 21 of the generator 2 with respect to the rotation speed of the engine 1 is quadrupled. At this time, the pulley b ₃ is idled by the one-way clutch 35, and the driving by the pulleys b ₁ , b ₂ , b ₃ is not transmitted to the second rotating shaft 32.

  In this embodiment, the speed change magnification is doubled and quadrupled, but the present invention is not limited to this. Further, the number of rotating shafts included in the transmission 3 'is not limited to three, and may be four or more.

  In the embodiment described above, the structure using the pulley and the belt as the rotation transmission means in the transmission is exemplified, but the present invention is not limited to this, and a chain may be used instead of the belt. Further, rotation may be transmitted using a conventionally known rotation transmission means such as a gear. However, a rotation transmission structure using a pulley and a belt is desirable from the viewpoint of driving noise, inspection, repair, and the like.

It is a schematic diagram showing one embodiment of a power generator concerning the present invention. It is a block diagram example of the electric power generating apparatus of FIG. 2 is a flowchart of an example of shift control of the transmission of FIG. It is a figure which shows the engine speed and the example of ON / OFF control of an electromagnetic clutch. It is a schematic diagram which shows other embodiment of the electric power generating apparatus which concerns on this invention.

Explanation of symbols

1 Engine 2 Generator 3, 3 'Transmission (Transmission)
4 control means 5 delay circuit S sensor (measuring means)
11 output shaft 21 input shaft 31 first rotation shaft 32 second rotation shaft 33 third rotation shaft 34 electromagnetic clutch 35 one-way clutch a ₁ , a ₂ , b ₁ , b ₂ , b ₃ , c ₁ , c ₂ , d _1, d ₂ pulleys _{B 1, B 2, B 3} , B 4 belt

Claims (6)

A transmission, a transmission that is interposed between an output shaft of the engine and an input shaft of the generator, and that transmits the rotational speed from the output shaft to the input shaft in multiple stages, and controls the transmission A power generator comprising: a control means for measuring; and a measuring means for measuring the rotational speed of the output shaft or the input shaft,
The power generation device characterized in that when the rotation speed of the output shaft becomes a predetermined value or less and the transmission gear ratio of the transmission device is increased, the operation of changing the transmission gear ratio is delayed for a predetermined time.   The power generator according to claim 1, wherein the gear ratio of the transmission is immediately reduced when the rotation speed of the output shaft becomes equal to or greater than a predetermined value.   The transmission includes a first rotating shaft attached with at least one pulley connected to the output shaft of the engine, and a second rotating shaft attached with at least two pulleys connected to the input shaft of the generator. The pulley of the first rotating shaft and the pulley of the second rotating shaft are connected directly or indirectly by a belt or chain, and the rotation is transmitted from the pulley attached to the second rotating shaft to the second rotating shaft. The power generator according to claim 1 or 2, wherein the number of revolutions from the output shaft of the engine is changed in multiple stages and transmitted to the generator by selecting a pulley to be used.   Two pairs of pulleys are attached to the first rotary shaft and the second rotary shaft, one pulley pair is attached to the rotary shaft via an electromagnetic clutch, and the other pulley pair is attached to the rotary shaft via a one-way clutch. The power generator according to claim 3, wherein a pulley that is attached to and transmits the rotation to the second rotating shaft by turning on and off the electromagnetic clutch is selected.   The transmission further includes a third rotating shaft to which at least two pulleys are attached. One of these pulleys is connected to the pulley of the first rotating shaft, and the other one or more pulleys are connected to the second rotating shaft. The power generation device according to claim 3 connected to a pulley.   Two pairs of pulleys are attached to the second rotating shaft and the third rotating shaft, one pulley pair is attached to the rotating shaft via an electromagnetic clutch, and the other pulley pair is attached to the rotating shaft via a one-way clutch. The power generation device according to claim 5, wherein a pulley that is attached to and transmits rotation to the second rotation shaft by turning on and off the electromagnetic clutch is selected.

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