JP6266406B2 - Turning device and operation method of turning device - Google Patents

Description

  The present invention relates to a turning device that is used when a turbine such as a steam turbine is stopped or started, and a method for operating the turning device.

  2. Description of the Related Art Conventionally, in a turbine such as a steam turbine, a turning device for rotating a turbine rotor at a low speed (for example, about 3 rpm) by a gear driving motor of a turning device, particularly in a large-scale commercial steam turbine used for power generation or the like. I have. This turning device is used to prevent bending deformation due to the weight of the turbine rotor by rotating at a low speed until the temperature of the turbine rotor, which is at a high temperature, is sufficiently lowered after the turbine is stopped. Further, this turning device is also used to correct and return straight if there is a bending deformation of the turbine rotor that occurs during the stoppage when the turbine is started. The turbine rotor includes a turbine rotor shaft, an impeller (disk), a moving blade (blade), and the like.

The above-described turning device generally has a structure in which an AC electric motor is used as a gear driving motor of a driving source, and a turbine rotor shaft is rotated at a low speed by combining a speed reduction mechanism.
Patent Document 1 below discloses a turbine turning device that includes an AC motor as a main device and a DC motor as an auxiliary device. In this case, an AC motor and a DC motor are connected in series in the horizontal direction, and a structure that outputs from a motor gear attached to the AC motor side via a chain, an AC motor and a DC motor are arranged in parallel, and the transmission gear group A turning device having a structure in which one of the electric motors can be selected by providing a switching device therebetween is shown.

JP 59-180009 A

  By the way, since the conventional turning device described above uses an AC motor as a drive source, for example, if the AC power supply system of a power plant fails for some reason and causes a power failure, the AC motor cannot be operated due to power loss. In such a situation, a turning device using an AC electric motor as a drive source cannot be used. Therefore, for example, when the operation of the steam turbine is stopped, it is impossible to prevent the hot turbine rotor from being bent due to its own weight.

  In order to solve such a problem of the conventional device, a configuration of Patent Document 1 including an AC motor as a main device and a DC motor as an auxiliary device is conceivable. However, in a structure in which an AC motor and a DC motor are arranged in series in the horizontal direction and the motor gear is attached to the AC motor side, the installation space (floor installation area) of the motor in the horizontal direction (when viewed in plan) becomes large Furthermore, when a problem occurs in the AC motor of the main device, there is a problem that the response becomes complicated, for example, switching of the drive system from the AC motor becomes necessary.

From such a background, in a turning device that uses both an AC motor and a DC motor, the installation space of the motor in the horizontal direction is minimized, and it is easy to cope with a problem in a normal AC motor. It is desirable.
The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to minimize the horizontal motor installation space in a turning device that uses both an AC motor and a DC motor, It is an object of the present invention to provide a turning device and a method for operating the turning device that can easily cope with a problem occurring in an AC motor.

In order to solve the above problems, the present invention employs the following means.
A turning device according to the present invention includes an AC motor and a DC motor as a drive source for turning by rotating a turbine rotor, the AC motor is arranged on the upper side in the vertical direction, and the DC motor is placed on the lower side. It arrange | positions and the output shaft of the said AC motor and the said DC motor is connected in series by the up-down direction by the coupling.

According to such a turning device, it is provided with an AC motor arranged on the upper side in the vertical direction and a DC motor arranged on the lower side, and the output shafts of the AC motor and the DC motor are connected in series in the vertical direction. Therefore, as a countermeasure against power supply troubles, a normal motor and an emergency motor are installed, and turning can be reliably performed using either one of the two installed motors. In addition, since the upper AC motor is installed by effectively using the dead space above the DC motor arranged on the lower stage, it is possible to install two motors without increasing the horizontal installation space. become.
In addition, since the output shaft of the AC motor and the DC motor is normally connected via a coupling, if a problem occurs in the upper AC motor, the lower shaft can be removed by simply removing the coupling. The DC motor installed in can be operated independently.

Said coupling WHEREIN: It is preferable that the said coupling equips at least one part with the auxiliary tool connection part for attaching the hand turning auxiliary tool which turns manually.
In this case, a hand turning assist mechanism is provided that supports the hand turning assist tool attached to the assist tool connecting portion and assists the rotational movement of the output shaft in the circumferential direction, and the hand turning assist mechanism includes the hand turning assist mechanism. By providing an auxiliary tool attaching / detaching auxiliary mechanism that supports the tool and is movable in the radial direction of the output shaft, the heavy hand turning auxiliary tool can be easily attached / detached and rotated.

  The method for operating a turning device according to the present invention is a method for operating a turning device according to any one of the above, and uses an AC motor as a regular and a DC motor as an emergency as a driving source for turning, A start-up assist operation mode in which the AC motor and the DC motor are used simultaneously from the start of turning on until the rotation is stabilized is provided.

  According to such a driving method of the turning device, since it is provided with the assist operation mode at the time of starting using the AC motor and the DC motor simultaneously as a driving source of the turning from the start of turning to the stabilization of rotation, At the time of starting to start turning of a turning device that requires a large torque compared to after the start of rotation, an emergency DC motor performs an operation to assist a normal AC motor, and two motors are required for starting. Torque can be secured. Therefore, compared to the case of using a single motor whose capacity is set based on the required torque at the time of turning on, it is possible to suppress the capacity of a regular AC motor to be small.

  According to the present invention described above, since the output shafts of the AC motor and the DC motor are connected in series in the vertical direction as the driving source of the turning device, it is minimized without increasing the horizontal motor installation space. Two motors can be used together. Furthermore, in the event of a problem with the AC motor arranged on the upper side, it can be separated by simply disconnecting the coupling connected to the output shaft of the DC motor arranged on the lower side. A single operation can be easily handled.

  In addition, the above-described present invention can ensure a necessary starting torque by using two motors in combination by an operation method having an activation assist operation mode in which an emergency DC motor assists a normal AC motor. For this reason, the capacity | capacitance of the alternating current motor used regularly can be restrained to a capacity | capacitance required for normal turning operation smaller than the torque at the time of starting.

It is a figure which shows one Embodiment of the turning apparatus which concerns on this invention, and the operating method of a turning apparatus, and is the side surface (AA arrow of FIG. 2) which expanded the principal part of the turning apparatus. It is a front view which shows the structural example of the steam turbine power generator provided with the turning apparatus shown in FIG. FIG. 3 is a plan view of the steam turbine power generator shown in FIG. 2. It is a principal part perspective view which shows the structural example of the hand turning mechanism which used the hand turning lever for the hand turning auxiliary tool. It is a principal part perspective view which shows the structural example of the hand turning mechanism which used the hand turning spanner for the hand turning auxiliary tool.

Hereinafter, an embodiment of a turning device and a method for operating the turning device according to the present invention will be described with reference to the drawings.
The steam turbine power generator 1 shown in FIGS. 2 and 3 uses a steam turbine 3 as a drive source for the generator 2. In the illustrated configuration example, the steam turbine 3 including the low-pressure steam turbine 3L and the high / medium-pressure steam turbine 3H arranged in series is employed. However, the embodiment described below includes, for example, a plurality of low-pressure turbines 3L. The present invention can be applied to the provided configuration and the like, and is not particularly limited.

The steam turbine 3 is a device that obtains a shaft output by rotating a turbine rotor (not shown) by the energy of the introduced steam. The turbine rotor includes an impeller, a moving blade, and the like that rotate integrally with the turbine rotor shaft 3a. Further, the turbine rotor shaft 3 a of the steam turbine 3 is connected to the rotor shaft 2 a of the generator 2 via the coupling 4.
On the outer peripheral surface of the coupling 4, a coupling spacer gear 4 a that meshes with a final-stage output gear 15 e that constitutes a speed reduction mechanism 15 (see FIG. 1) of the turning device 10 described later is formed over the entire circumference.

As shown in FIG. 1, for example, the turning device 10 of the present embodiment includes an AC motor 11 and a DC motor 12 as a turning drive motor as a drive source. The AC motor 11 is supplied with power from an AC power source such as a power system or a private power generator. The DC motor 12 is supplied with power from a DC power source obtained by AC / DC conversion of power from an AC power source such as a power system or a private power generator, and also receives power from an emergency DC power source such as a secondary battery such as a lithium battery. It comes to be supplied.
In the following description, “up and down” refers to the vertical direction in the vertical direction. The AC motor 11 and the DC motor 12 are arranged in the vertical direction with the AC motor 11 as the upper side. That is, if the motors have the same capacity (KW), the outer diameter of the DC motor 12 is generally larger than that of the AC motor 11. Therefore, the DC motor 12 having a large outer shape is arranged on the lower stage side and the outer shape is small. It is better to place the AC motor 11 on the upper side more stably.

In the AC motor 11 and the DC motor 12 described above, the motor shaft (output shaft) 11 a of the AC motor 11 and the motor shaft (output shaft) 12 a of the DC motor 12 are connected in the vertical direction via the motor coupling 13. Therefore, the motor shaft direction in this case is the vertical direction.
A screw gear (worm) 14 that rotates integrally with the motor shaft 12 a is provided on the outer periphery of the motor shaft 12 a extending downward from the DC motor 12. The screw gear 14 constitutes a so-called worm gear mechanism by meshing with a helical gear (worm wheel) 15 a which is a first stage gear of a gear group constituting the speed reduction mechanism 15.

  The illustrated speed reduction mechanism 15 includes a second gear 15b provided coaxially with the helical gear 15a, a third gear 15c meshing with the second gear 15b, and coaxial with the third gear 15c. A provided fourth stage gear 15d and a final stage (fifth stage) output gear 15e meshing with the fourth stage gear 15d are provided, and the output gear 15e meshes with the coupling spacer gear 4a described above. Such a speed reduction mechanism 15 may be any mechanism as long as it reduces the rotational speed of the motor shaft 12a and rotationally drives the turbine rotor shaft 3a at a desired low rotational speed, and is not particularly limited with respect to the gear configuration and the like.

By interposing such a speed reduction mechanism 15, the rotation speed (for example, 1000 rpm or 1200 rpm) of the motor shaft 12 a is reduced, and therefore the turning device 10 finally rotates integrally with the coupling 4. Can be slowly rotated at a preset low speed (for example, about 2 to 9 rpm).
1 to 3, reference numeral F in the drawings denotes a floor of the turbine building, S denotes a bearing stand, and Sm denotes an electric motor base.

As described above, the turning device 10 of the present embodiment includes the AC motor 11 disposed on the upper stage side and the lower stage side as a drive source for performing the turning by rotating the turbine rotor at a low speed after the operation of the steam turbine 3 is stopped or before starting. The AC motor 11 and the output shafts 11a and 12a of the DC motor 12 are connected in series in the vertical direction via the motor coupling 13.
For this reason, as a countermeasure against power supply troubles, a configuration in which a regular AC motor 11 and an emergency DC motor 12 are installed is used so that turning can be reliably performed using either one of the two installed motors. Become.

In other words, during normal turning, only normal AC motor 11 is energized to perform turning. However, in the event of an emergency where there is no AC power supply due to a power station trouble or the like, the DC power supply can be used in an emergency state. Only the electric motor 12 can be energized to perform turning. During normal turning by the AC motor 11, the DC motor 12 that is not excited is rotated, but a braking force that prevents the rotation of the AC motor 11 is not generated. After the rotation is started, there is also an advantage that the turning rotation is stabilized by the inertial force of the magnetic rotor inside the DC motor.
Moreover, even when any one of the AC motor 11 and the DC motor 12 fails, the other motor that does not fail can be turned.

Next, the AC motor 11 and the DC motor 12 described above have the advantages described below by being arranged in series and coaxial in the vertical direction.
As a first advantage, since the AC motor 11 and the DC motor 12 are connected in series / coaxial in the vertical direction, if the normal AC motor 11 becomes inoperable due to problems such as seizure, the emergency DC motor In order to switch to 12, that is, in order to rotate the turbine rotor shaft 3a, a special operation such as switching the connection of the gears, the chain, and the like of the speed reduction mechanism 15 is not required.

Specifically, since the normal AC motor 11 is arranged on the upper stage side, when the AC motor 11 malfunctions, the upper AC motor 11 is separated and arranged on the lower stage side. It is necessary to perform independent turning by the DC motor 12 for use.
In such a case, the turning device 10 of the present embodiment is configured so that the output shaft 11a of the AC motor 11 and the output shaft 12a of the DC motor 12 are used in order to perform the turning by independently operating the DC motor 12 installed on the lower side. It is only necessary to perform a simple operation of disconnecting the motor coupling 13 connecting the AC motor 11 and separating the AC motor 11 from the DC motor 12.

  As a second advantage, since the AC motor 11 is installed on the upper stage by effectively using the dead space existing above the DC motor 12 arranged on the lower stage side, the steam turbine power generator 1 is installed in the horizontal direction. Two electric motors can be installed in the turning device 10 without increasing space. That is, in terms of space, in the conventional configuration in which only one motor is used, an additional motor is installed in the dead space that exists above (in the sky) of the bearing base S. Therefore, the conventional configuration of one motor is used. Compared to the above, the installation space in the horizontal direction does not increase with the addition of the electric motor, and the installation can be performed in a smaller space than the configuration in which two units are arranged in series in the horizontal direction.

Further, the AC motor 11 and the DC motor 12 have the advantages described below by operating in a coaxial manner.
More specifically, the turning device 10 requires a larger starting torque than the normal turning operation in which the turbine rotor rotates stably at the time of turning starting to rotate the turbine rotor in a stopped state. For this reason, at the time of turning start-up, an operation method for securing a necessary start-up torque by simultaneously using the emergency DC motor 12 in addition to the normal AC motor 11 becomes possible.

That is, in the turning device 10 having the above-described configuration, the AC motor 11 is commonly used as a turning motor rotation drive source, and the DC motor 12 is used as an emergency. Then, from the start of turning on until the turning rotation is stabilized, an operation method having a start-up assist operation mode in which the AC motor 11 and the DC motor 12 are simultaneously used as drive sources becomes possible.
Note that after the turning rotation of the turbine rotor is stabilized, the start-up assist operation mode is ended and the normal turning operation is shifted, so that the DC motor 12 is in an operation state in which energization is stopped and the motor is rotated freely. .

  In such a start-up assist operation mode of the turning device 10, the emergency DC motor 12 is used for normal AC in order to secure a large start-up torque as compared with the required torque after the turbine rotor starts rotating by turning. An operation of assisting the electric motor 11 is performed. As a result, the required starting torque can be ensured by the two units of the AC motor 11 and the DC motor 12, and therefore, for the normal AC motor 11, one motor whose capacity is set with reference to the required torque at the time of starting. Compared to the case of using the motor, the capacity of the motor can be reduced to, for example, about 50%.

  On the other hand, the emergency DC motor 12 needs to be capable of turning independently from turning on when the AC motor 11 becomes unusable. For this reason, the DC motor 12 cannot keep the capacity of the motor small, and therefore the difference in outer diameter between the DC motor 12 and the AC motor 11 whose outer diameter increases even with the same capacity becomes even larger. It becomes increasingly important that the position of 12 is set to the lower side.

In addition, the AC motor 11 is an electric motor that has a low need for maintenance, but the DC motor 12 is an electric motor that has a high need for maintenance such as a brush. Therefore, it is more convenient to perform the maintenance work if the DC motor 12 having a lot of maintenance opportunities is arranged at a lower position on the lower side.
When the AC motor 11 and the DC motor 12 are operated on the same axis, the rotation of the motor shafts 11a and 12a rotating at about 1000 to 1200 rpm using the inertial force of the excitation rotor of the DC motor 12 is stabilized. There is also an advantage that the load on the bearing portion (not shown) is reduced and the life of the bearing is improved.

By the way, as shown in FIG. 4, for example, any of the above-described turning apparatuses 10 is a hand turning mechanism for manually turning using a hand turning auxiliary tool when turning by the AC motor 11 and the DC motor 12 is not possible. 20 is provided.
The hand turning mechanism 20 shown in FIG. 4 is provided on at least a part of the outer peripheral surface, which is the side surface of the motor coupling 13 that connects the output shaft 11a of the AC motor 11 and the output shaft 12a of the DC motor 12, and is described later. A plurality of attachment holes 13a for inserting and attaching the connecting pins 32 of the turning lever (hand turning aid) 30 are provided. In this case, the plurality of mounting holes 13 a serve as auxiliary tool connecting portions, and the mounting holes 13 a are provided at equal pitches with the connecting pins 32 over at least a part of the outer peripheral surface of the side surface of the motor coupling 13.

The hand turning mechanism 20 includes a hand turning auxiliary mechanism 21 that supports the weight of the hand turning lever 30 attached to the attachment hole 13a and assists the rotational movement of the motor shafts 11a and 12a in the circumferential direction. The illustrated hand turning auxiliary mechanism 21 includes a ring-shaped circumferential guide rail 22 installed on the outer periphery of the motor coupling 13 and a slider 23 that moves on the outer periphery of the motor coupling 13 along the circumferential guide rail 22. I have. In this case, a known device that facilitates movement is provided between the circumferential guide rail 22 and the slider 23, for example, a wheel is provided on the slider 23 side.
The circumferential guide rail 22 described above is a ring-shaped member or a partial ring shape that is concentrically installed so as to surround the entire circumference of the motor coupling 13 or the range in which the rotating operation of pushing the hand turning lever 30 in the circumferential direction is performed. It is a member and is installed on a horizontal plane orthogonal to the motor shafts 11a and 12a.

  Depending on the shape of the motor mount Sm, the push-and-go movement performed in the circumferential direction when performing hand turning is possible only for a part of the area on the circumferential track, or the circumferential guide rail 22 extends over the entire circumference of the motor coupling 13. The circumferential guide rail 22 may not be formed in a surrounding ring shape, and only a part of the ring shape may be formed. Even in that case, since the mounting hole 13a is formed over the outer peripheral surface of the motor coupling 13, it is possible to perform hand turning by repeating the connection of the hand turning lever 30, the manual movement between partial areas, and the removal operation. It is.

On the upper surface of the slider 23, an auxiliary tool attaching / detaching auxiliary mechanism 25 that supports the hand turning lever 30 and is movable in the radial direction of the motor shafts 11a, 12a is provided.
The illustrated auxiliary tool attaching / detaching auxiliary mechanism 25 includes a radial guide rail 26 provided on the upper surface of the slider 23, and a slide table 27 movable in the radial direction along the guide rail 26. In this case, a known device that facilitates movement is also provided between the guide rail 26 and the slide table 27. Further, in the case where the hand-pushing movement during hand turning is possible only for a partial area on the circumferential track, the connection and removal operations of the connection pin 32 and the mounting hole 13a are repeated. The usefulness of the attachment / detachment assisting mechanism 25 will increase. Further, a concave portion 27 a is formed on the upper surface of the slide table 27 so as to engage a distal end portion main body 31 of a hand turning lever 30 described later.

  The hand turning lever 30 is an input-side member used for turning by human power. The hand turning lever 30 is protruded from the tip end body 31 having a substantially rectangular parallelepiped shape and the tip end face 31a of the tip end body 31 and is inserted into the mounting hole 13a. A plurality of connecting pins 32 and a lever 33 coupled to the rear end surface 31 b of the tip end body 31. The lever 33 is a rod-shaped member having sufficient strength and length to enable turning by human power utilizing the lever principle.

In the hand turning mechanism 20 configured as described above, when the hand turning is performed, an operation of first attaching the hand turning lever 30 to the outer peripheral surface of the motor coupling 13 is performed.
In this operation, the tip end main body 31 is first placed in engagement with the concave portion 27 a of the slide table 27. As a result, the weight of the hand turning lever 30 is supported by the circumferential guide rail 22 via the slide table 27 and the slider 23. The circumferential guide rail 22, the slider 23, the slide table 27, and the recess 27a are installed so that the connecting pin 32 and the mounting hole 13a are at the same level in this state.

Therefore, when the hand turning lever 30 is pushed in the radial direction toward the motor coupling 13 using the auxiliary tool attaching / detaching assist mechanism 25 from this state, the hand turning lever 30 moves along the guide rail 26 together with the slide table 27. Therefore, the connecting pin 32 can be inserted and attached to the attachment hole 13a. Therefore, it is easy to attach the heavy hand turning lever 30 and push it in the circumferential direction to perform the rotating operation.
Further, when the circumferential position of the connecting pin 32 is shifted from the mounting hole 13a, if the slider 23 is moved along the circumferential guide rail 22 by using the hand turning auxiliary mechanism 21, the weight of the connecting pin 32 is increased. A certain hand turning lever 30 can be easily aligned.

When the attachment of the hand turning bar 30 is completed in this way, the turning of the lever 33 is pushed in the circumferential direction by using the hand turning auxiliary mechanism 21 to perform manual turning. As a result, since the hand turning bar 30 moves along the circumferential guide rail 22 together with the slider 23 and the slide table 27, turning torque is applied to the motor coupling 13 connected via the connecting pin 32. .
In addition, after manual turning is complete | finished, the heavy hand turning lever 30 can be easily removed using the auxiliary tool attachment / detachment auxiliary mechanism 25.
Further, the position at which the mounting hole 13a of the motor coupling 13 to which the hand turning bar 30 is attached is not limited to the upper part of the motor coupling 13 shown in FIG. 4, but may be provided at the lower part as necessary.

Moreover, although the hand turning mechanism 20 described above uses the hand turning lever 30 as a hand turning auxiliary tool, for example, a hand turning spanner 40 having a shape as shown in FIG. 5 may be adopted.
This hand turning spanner (hand turning aid) 40 is a member on the input side used for turning by human power. The hand turning spanner 40 includes a spanner portion 42 provided at the tip of the lever 41. The spanner portion 42 is a portion that engages with a nut portion 13 b provided as an auxiliary tool connecting portion on at least a part of the side surface of the motor coupling 13. Although the illustrated nut portion 13b is a hexagon, there is no particular limitation such as an octagon.

The hand turning spanner 40 configured as described above supports the weight by placing the lever 41 on the slider 23A of the hand turning auxiliary mechanism 21A as a preparatory work before the hand turning. After that, by sliding the lever 41 on the slider 23A in the radial direction, the spanner portion 42 that moves toward the motor shafts 11a and 12a can be engaged with the nut portion 13b. At this time, if there is a circumferential misalignment between the spanner part 42 and the nut part 13b, the slider 23A is moved along the circumferential guide rail 22 by using the hand turning auxiliary mechanism 21A. The heavy hand turning spanner 40 can be easily aligned.
Even when the hand turning spanner 40 is used, the auxiliary tool attaching / detaching auxiliary mechanism 25 described above may be provided on the slider 23A.

  As described above, the turning device 10 according to the present embodiment has an arrangement in which the AC motor 11 and the DC motor 12 of the driving source are connected in series in the vertical direction, so that it is minimized without increasing the horizontal motor installation space. Two electric motors can be used in combination. Further, when a problem occurs in the regular AC motor 11 arranged on the upper stage side, it can be separated from the emergency DC motor 12 arranged on the lower stage by a simple operation of simply disconnecting the motor coupling 13. It is also possible to easily cope with single operation of the electric motor 12.

Further, in the operation method in the start-up assist operation mode in which the emergency DC motor 12 assists the regular AC motor 11, it is possible to secure a large start-up torque at the start of turning by the two AC motors 11 and the DC motor 12. When determining the capacity of the AC motor 11, it is not necessary to consider the torque at the time of turning on. For this reason, it becomes possible to suppress the capacity | capacitance of the AC motor 11 to a value required for the normal turning operated with a torque smaller than the starting torque, and thus the AC motor 11 can be miniaturized.
In addition, this invention is not limited to embodiment mentioned above, For example, it can change suitably in the range which does not deviate from the summary, such as being applicable also to the turbine rotor of a gas turbine.

DESCRIPTION OF SYMBOLS 1 Steam turbine generator 2 Generator 3 Steam turbine 4 Coupling 4a Coupling spacer gear 10 Turning apparatus 11 Alternator 11a, 12a Motor shaft (output shaft)
12 DC generator 13 Motor coupling 13a Mounting hole (Auxiliary tool connecting part)
13b Nut (auxiliary connecting part)
14 Screw gear (worm)
15 Reduction mechanism 15a Helical gear (worm wheel)
15e output gear 20 hand turning mechanism 21 hand turning assist mechanism 22 circumferential guide rail 23 slider 25 assist tool attaching / detaching assist mechanism 26 guide rail 27 slide table 27a recess 30 hand turning lever (hand turning assist tool)
40 Hand turning spanner (hand turning aid)

Claims (4)

  As a drive source for turning by rotating the turbine rotor, an AC motor and a DC motor are provided, the AC motor is arranged on the upper side in the vertical direction, the DC motor is arranged on the lower side, the AC motor and the A turning device characterized in that the output shaft of a DC motor is connected in series by coupling in the vertical direction.   The turning device according to claim 1, wherein the coupling includes at least a part of an auxiliary tool connecting portion for attaching a hand turning auxiliary tool for manually turning.   A hand turning auxiliary mechanism that supports the hand turning auxiliary tool attached to the auxiliary tool connecting portion and assists the rotational movement of the output shaft in the circumferential direction is provided, and the hand turning auxiliary mechanism supports the hand turning auxiliary tool. The turning device according to claim 2, further comprising an auxiliary tool attaching / detaching auxiliary mechanism that is movable in a radial direction of the output shaft. It is a driving | running method of the turning apparatus of any one of Claim 1 to 3,
While using an AC motor as a regular use and a DC motor as an emergency use as a driving source for turning,
An operation method of a turning device, comprising a start-up assist operation mode in which the alternating current motor and the direct current motor are used simultaneously from the start of turning on until the rotation is stabilized.

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