Rotary electric machine

Abstract

To prevent a rotary electric machine from being damaged by stopping rotation of a stator when abnormality occurs.SOLUTION: A power generator 1 includes: a stator 10 that is constituted by a stator core 10a and a stator winding 10b and being rotatable within a predetermined rotation angle range; a rotor 12 that is provided on an inner peripheral side of the stator 10 and rotates; a b-contact type limit switch 26 that detects a rotation position of the stator 10 to electrically transmit detection results; a drive motor 30 that rotates the stator 10; and a generator control unit 2 that stops the drive motor 30 when an open-circuit is detected from the limit switch 26 side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rotating electric machine, and is suitably applied to, for example, a generator having a rotor and a stator, which adjusts the phase of an output waveform by rotating the stator. [Background technology]

[0002] Conventionally, rotating electric machines having a stator and a rotor are widely known. In some of these rotating electric machines, the stator is composed of a stator core and a stator winding housed in slots on the inner circumference side of the stator core, and the rotor is provided on the inner circumference side of the stator and composed of a rotor core and a rotor winding wound around the rotor core (see, for example, Patent Document 1). As such rotating electric machines, there is one in which the phase of the output waveform is adjusted by rotating the stator within a preset range of a predetermined rotation angle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-77262 A Summary of the Invention [Problem to be solved by the invention]

[0004] In such a rotating electric machine, it is desirable to stop the rotation of the stator when an abnormality occurs, thereby preventing damage to the rotating electric machine.

[0005] The present invention has been made in consideration of the above points, and aims to propose a rotating electric machine that can stop the rotation of the stator when an abnormality occurs, thereby preventing damage to the rotating electric machine. [Means for solving the problem]

[0006] In order to solve these problems, the rotating electric machine of the present invention is provided with a stator composed of a stator core and a stator winding that is rotatable within a predetermined rotation angle range, a rotor that is located on the inner side of the stator and rotates, a limit switch that is of the b-contact type and detects the rotational position of the stator and electrically sends the detection result, a drive source that rotates the stator, and a control unit that stops the drive source if an open circuit is detected from the limit switch side.

[0007] According to the present invention, when an abnormality occurs and the control unit detects an open circuit from the limit switch side, the drive source is stopped, thereby making it possible to stop the rotation of the stator. Effect of the Invention

[0008] According to the present invention, if the control unit detects an open circuit from the limit switch side when an abnormality occurs, the rotation of the stator can be stopped by stopping the drive source, thereby realizing a rotating electric machine that can stop the rotation of the stator and prevent damage to the rotating electric machine when an abnormality occurs. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a cross-sectional view in the radial direction showing the configuration of the generator in a stator clockwise reference state. [Diagram 2] FIG. 2 is a cross-sectional view in the radial direction showing the configuration of the generator when the stator is in a maximum counterclockwise rotation state. [Diagram 3] FIG. 13 is a cross-sectional view in the radial direction showing the configuration of the generator in a state where the stator is collided in a counterclockwise direction. [Figure 4] FIG. 4 is an enlarged view of FIG. 3, illustrating the state of the stator teeth and the driving gear when the stator is in a counterclockwise collision state. [Diagram 5] FIG. 2 is a radial cross-sectional view showing the configuration of a generator of a comparative example in a stator rotation reference state. [Figure 6] FIG. 2 is a cross-sectional view in the radial direction showing the configuration of the generator when the stator is in a maximum counterclockwise rotation state. [Figure 7]FIG. 13 is a cross-sectional view in the radial direction showing the configuration of a generator of a comparative example in a state where the stator has been hit in a counterclockwise direction. [Figure 8] FIG. 8 is an enlarged view of FIG. 7, illustrating a state of the stator teeth portion and the driving gear of the comparative example in a state of collision in the counterclockwise direction of the stator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

[0011] [1. Generator configuration] As shown in Fig. 1, the generator 1 is mainly composed of a generator control unit 2, a stator receiver 4, a stator 10, a rotor 12, and a rotating shaft 14. A prime mover (not shown) is an engine, a turbine, a water wheel, etc., which applies a rotational force to the generator 1 to rotate each mechanism within the generator 1, thereby generating electricity. The generator control unit 2 is mainly composed of a CPU (Central Processing Unit) (not shown), and performs overall control of the generator 1 by reading and executing a predetermined program from a ROM, flash memory, etc. (not shown).

[0012] In the following, the direction along which the rotating shaft 14 runs is referred to as the axial direction Da, and the direction along which the rotor 12 rotates is referred to as the circumferential direction Dc. The direction approaching the rotational axis center Ra of the rotating shaft 14 when viewed from the axial direction Da is referred to as the inner circumferential direction, and the direction away from the rotational axis center Ra of the rotating shaft 14 when viewed from the axial direction Da is referred to as the outer circumferential direction. Furthermore, the direction perpendicular to the axial direction Da and along the inner circumferential direction and the outer circumferential direction is referred to as the radial direction Dd. Furthermore, with regard to the radial direction Dd, the side approaching the rotational axis center Ra of the rotating shaft 14 is referred to as the inner side or inner circumferential side, and the side away from the rotational axis center Ra of the rotating shaft 14 is referred to as the outer side or outer circumferential side.

[0013] The stator 10 has a cylindrical shape as a whole, is rotatably supported by the stator holder 4 on the upper side thereof, and is composed of a stator core 10a and a stator winding 10b. The stator core 10a is cylindrical, and annular electromagnetic steel sheets are laminated in the axial direction Da. The stator winding 10b is formed by aligning coil wires having a rectangular cross section, bundling them, and insulating them in rectangular slots punched out at equal intervals in the circumferential direction Dc on the inner periphery of the stator core 10a.

[0014] The generator 1 is a synchronous generator for frequency conversion using a synchronous motor as a drive motor, and in order to enable parallel operation, the stator 10 is configured to be rotatable in a stator clockwise direction Dcw, which is the clockwise direction in Fig. 1, and in a stator counterclockwise direction Dccw, which is the counterclockwise direction in Fig. 1, about a rotation shaft center Ra so that the phase of the output waveform of the generator 1 can be adjusted. Fig. 1 shows a stator rotation reference state in which the stator 10 is not rotating in either the stator clockwise direction Dcw or the stator counterclockwise direction Dccw with respect to the reference state.

[0015] In addition, the stator 10 has a stator tooth portion 20 having multiple protruding teeth continuously formed thereon, extending from the stator clockwise Dcw side of the height of the rotation shaft center Ra on the outer peripheral surface to the stator clockwise Dcw side of directly below the rotation shaft center Ra in the stator rotation reference state.

[0016] At positions on the outer circumferential surface of the stator 10 in the stator rotation reference state that are advanced by the same rotation angle in the stator clockwise direction Dcw and the stator counterclockwise direction Dccw from the center position of a pair of limit switches 26 (described later) on the outer circumferential surface of the stator 10 in the stator rotation reference state, for example, dogs 24 (dogs 24cw and 24ccw) having a truncated cone shape are fixed so as to protrude in the radial direction Dd. Hereinafter, the dog 24 arranged on the stator clockwise direction Dcw side with respect to the center position of the pair of limit switches 26 (described later) on the outer circumferential surface of the stator 10 in the stator rotation reference state is referred to as dog 24cw, and the dog 24 arranged on the stator counterclockwise direction Dccw side is referred to as dog 24ccw. Hereinafter, the dogs 24cw and 24ccw are collectively referred to as dog 24. For this reason, the dog 24 moves in the stator clockwise direction Dcw or the stator counterclockwise direction Dccw with the rotation of the stator 10.

[0017] When the stator 10 rotates in the stator counterclockwise direction Dccw from the stator rotation reference state and reaches a stator maximum counterclockwise rotation state as a rotation limit state in which a preset limit rotation position on the stator counterclockwise direction Dccw side is reached as shown in Fig. 2, the dog 24cw presses the limit switch 26cw (described later). On the other hand, when the stator 10 rotates in the stator clockwise direction Dcw from the stator rotation reference state and reaches a stator maximum clockwise rotation state as a rotation limit state in which a preset limit rotation position (not shown) on the stator clockwise direction Dcw side is reached, the dog 24ccw presses the limit switch 26ccw (described later).

[0018] In addition, at positions located just above the rotation axis center Ra on the outer peripheral surface of the stator 10 in the stator rotation reference state, the stoppers 22 (stoppers 22cw and 22ccw) as rotation stopping parts are fixed so as to protrude in the radial direction Dd in the stator clockwise direction Dcw and the stator counterclockwise direction Dccw, respectively, by the same rotation angle. In the following, the stopper 22 arranged on the stator clockwise direction Dcw side with respect to just above the rotation axis center Ra on the outer peripheral surface of the stator 10 in the stator rotation reference state is referred to as the stopper 22cw, and the stopper 22 arranged on the stator counterclockwise direction Dccw side is referred to as the stopper 22ccw. In the following, the stoppers 22cw and 22ccw are also collectively referred to as the stoppers 22. For this reason, the stoppers 22 move in the stator clockwise direction Dcw or the stator counterclockwise direction Dccw as the stator 10 rotates.

[0019] The stopper 22 is disposed on the far side of the stator tooth portion 20 in the axial direction Da on the paper surface in Fig. 1. On the movement path of the stopper 22ccw rotating in the stator counterclockwise direction Dccw from the stator rotation reference state, a stator abutment portion 4ccw is formed, which is a part of the stator receiver 4, is located to the left of the stator 10 in Fig. 3 and below the rotation shaft center Ra, and is very close to the outer circumferential surface of the stator 10. On the other hand, on the movement path of the stopper 22cw rotating in the stator clockwise direction Dcw from the stator rotation reference state, a stator abutment portion 4cw is formed, which is a part of the stator receiver 4, is located to the right of the stator 10 in Fig. 3 and below the rotation shaft center Ra, and is very close to the outer circumferential surface of the stator 10.

[0020] When the stator 10 further rotates in the stator counterclockwise direction Dccw from the stator maximum rotation state in the stator counterclockwise direction (FIG. 2), the stopper 22ccw collides with the stator abutment portion 4ccw, resulting in a stator counterclockwise collision state, as shown in FIG. 3 and FIG. 4. On the other hand, when the stator 10 further rotates in the stator clockwise direction Dcw from the stator maximum rotation state in the stator clockwise direction (not shown), the stopper 22cw collides with the stator abutment portion 4cw, resulting in a stator clockwise collision state.

[0021] The rotor 12 is fixed to the rotating shaft 14 by fitting or the like, and has a salient pole provided on the inner periphery of the annular stator 10 with an air gap 11 between the stator 10 and the rotor 12, and is composed of a rotor core 12a and a rotor winding 12b. The rotor core 12a is made of electromagnetic steel sheets laminated in the axial direction Da, similar to the stator core 10a. The rotor winding 12b is wound around the rotor core 12a.

[0022] The rotating shaft 14 has a cylindrical shape and extends along an axial direction Da, and rotates in a circumferential direction Dc about a rotating shaft center Ra that is the center of the rotating shaft 14. An end of the rotating shaft 14 is directly connected to a prime mover (not shown).

[0023] A driving motor 30 is fixed to the stator receiver 4 on the outer periphery side of the stator 10 and below the center Ra of the rotation shaft. A driving gear 32 is attached to the output shaft of the driving motor 30 so as to mesh with the stator teeth 20 of the stator 10 in the stator rotation reference state, and the driving gear 32 rotates as the output shaft of the driving motor 30 rotates. The driving gear 32 has teeth formed all around. The generator 1 rotates the output shaft of the driving motor 30 to transmit a rotational driving force to the stator 10 via the driving gear 32 and the stator teeth 20, and adjusts the phase of the output waveform of the generator 1 by rotating the output shaft of the driving motor 30 within a preset rotation angle range based on the control of the generator control unit 2.

[0024] Limit switches 26 (limit switches 26cw and 26ccw) and a generator control unit 2 are provided on the opposite side of the drive motor 30 and the drive gear 32, below the rotation shaft center Ra on the outer circumferential side of the stator 10. In the following, the limit switch 26 arranged on the stator clockwise direction Dcw side with respect to the center position between adjacent limit switches 26 will be referred to as limit switch 26cw, and the limit switch 26 arranged on the stator counterclockwise direction Dccw side will be referred to as limit switch 26ccw. In the following, the limit switches 26cw and 26ccw will also be collectively referred to as limit switches 26.

[0025] The two limit switches 26 (limit switches 26cw and 26ccw) are arranged at intervals along the rotation direction of the stator 10 with their tips in close proximity to the outer circumferential surface of the stator 10, detect ON / OFF, and electrically transmit the detection result to the generator control unit 2 via the wiring cables 28 connected to each limit switch 26. Specifically, the limit switch 26 has a contact configuration of a b-contact type. A b-contact is a contact configuration in which a closed circuit opens when the switch is pressed, resulting in an open circuit. Therefore, when the limit switch 26 is not pressed by the dog 24 of the stator 10 as in the stator rotation reference state (FIG. 1), the limit switch 26 becomes a closed circuit and notifies the generator control unit 2 of the detection result of ON. On the other hand, when the limit switch 26 is pressed by the dog 24 of the stator 10 as in the stator counterclockwise maximum rotation state shown in FIG. 2, the limit switch 26 becomes an open circuit and notifies the generator control unit 2 of the detection result of OFF.

[0026] When the generator control unit 2 obtains a detection result of OFF (open circuit) from the limit switch 26cw, it determines that the stator has reached the maximum counterclockwise rotation state as shown in FIG. 2. At this time, the generator control unit 2 cuts off the power supplied to the drive motor 30, thereby stopping the rotation of the drive motor 30 and also stopping the rotation of the stator 10. This prevents the stator 10 from rotating further in the stator counterclockwise direction Dccw than the maximum stator counterclockwise rotation state, which would cause the cable connected to the stator 10 to be torn off. In this embodiment, the rotation angle from the stator rotation reference state to the maximum stator counterclockwise rotation state is set to, for example, about 45°.

[0027] On the other hand, if the limit switch 26 itself fails in an open circuit state or if the wiring cable 28 is broken, the limit switch 26 side relative to the generator control unit 2 becomes an open circuit in the same way as when the limit switch 26 is pressed, so the generator control unit 2 detects the open circuit from the limit switch 26 side. In this case as well, the generator control unit 2 cuts off the power supplied to the drive motor 30, thereby stopping the rotation of the drive motor 30 and also stopping the rotation of the stator 10.

[0028] Furthermore, if the generator control unit 2 is unable to stop the drive motor 30 due to various factors and the stator 10 rotates further in the stator counterclockwise direction Dccw from the maximum stator counterclockwise rotation state (Fig. 2), the stopper 22ccw of the stator 10 collides with the stator abutment portion 4ccw of the stator receiver 4, resulting in a stator counterclockwise collision state, as shown in Fig. 3 and Fig. 4. As a result, the generator 1 physically stops the rotation of the stator 10 that has rotated in the stator counterclockwise direction Dccw beyond the maximum stator counterclockwise rotation state.

[0029] At this time, as shown in Fig. 4, the end of the stator tooth portion 20 of the stator 10 in the stator clockwise direction Dcw is located in the stator counterclockwise direction Dccw from the position where it meshes with the drive-side gear 32, so that the stator tooth portion 20 and the drive-side gear 32 are not meshed with each other. In other words, the stator tooth portion 20 is arranged so that when the stator 10 rotates in the stator counterclockwise direction Dccw beyond the maximum stator counterclockwise rotation state, the meshing between the stator tooth portion 20 and the drive-side gear 32 is released just before the stopper 22ccw collides with the stator abutment portion 4ccw of the stator receiver 4. Therefore, in the stator counterclockwise collision state, the rotational driving force of the drive motor 30 is not transmitted from the drive-side gear 32 to the stator tooth portion 20.

[0030] The above describes a case where the stator 10 rotates in the stator counterclockwise direction Dccw from the stator rotation reference state (FIG. 1), the dog 24cw is detected by the limit switch 26cw (FIG. 2), the stopper 22ccw collides with the stator abutment portion 4ccw (FIG. 3), and at that time, the end of the stator tooth portion 20 of the stator 10 in the stator clockwise direction Dccw is located in the stator counterclockwise direction Dccw from the position meshing with the drive-side gear 32. In contrast, the same is true when the stator 10 rotates in the stator clockwise direction Dcw from the stator rotation reference state (FIG. 1), and the dog 24ccw is detected by the limit switch 26ccw, the stopper 22cw collides with the stator abutment portion 4cw, and at that time, the end of the stator tooth portion 20 of the stator 10 in the stator counterclockwise direction Dccw is located in the stator clockwise direction Dcw from the position meshing with the drive-side gear 32.

[0031] [2. Comparative Example] Here, a generator 101 of a comparative example shown in Figures 5, 6, 7, and 8, in which the same reference numerals are used for the members corresponding to those in Figures 1, 2, 3, and 4, respectively, will be described. The generator 101 is different from the generator 1 in that it has a limit switch 126 (limit switches 126cw and 126ccw) instead of the limit switch 26 (limit switches 26cw and 26ccw) and a stator 110 instead of the stator 10, but is otherwise configured similarly. Hereinafter, the limit switches 126cw and 126ccw are also collectively referred to as limit switches 126.

[0032] The limit switch 126 (limit switches 126cw and 126ccw) is disposed in the same position as the limit switch 26 (limit switches 26cw and 26ccw), and has a contact configuration of the a-contact type. The a-contact is a contact configuration in which, when the switch is pressed, an open circuit is closed to form a closed circuit. Therefore, when the limit switch 126 is not pressed by the dog 24 of the stator 110 as in the stator rotation reference state (FIG. 5), the limit switch 126 becomes an open circuit and notifies the generator control unit 2 of the detection result of OFF. On the other hand, when the limit switch 126 is pressed by the dog 24 of the stator 110 as in the stator maximum counterclockwise rotation state shown in FIG. 6, the limit switch 126 becomes a closed circuit and notifies the generator control unit 2 of the detection result of ON.

[0033] When the generator control unit 2 obtains a detection result of ON (closed circuit) from the limit switch 126cw, it determines that the stator has reached the maximum counterclockwise rotation state as shown in Fig. 6. At this time, the generator control unit 2 cuts off the power supplied to the drive motor 30, thereby stopping the rotation of the drive motor 30 and also stopping the rotation of the stator 110.

[0034] On the other hand, if the limit switch 126 itself fails in an open circuit state, or if the wiring cable 28 is broken, the limit switch 126 side relative to the generator control unit 2 becomes an open circuit, unlike when the limit switch 126 is pressed, and the generator control unit 2 detects the open circuit from the limit switch 126 side.

[0035] In this way, in the case of the generator 101, since the limit switch 126 is of the a-contact type, when the limit switch 126 fails in an open circuit state or when the wiring cable 28 is broken, the generator control unit 2 cannot detect a closed circuit. Therefore, even if the stator 110 reaches the maximum stator counterclockwise rotation state, the generator 101 cannot detect the maximum stator counterclockwise rotation state and does not stop the rotation of the drive motor 30, and continues to rotate the stator 110. In that case, the generator 101 exceeds the maximum stator counterclockwise rotation state and rotates the stator 110 in the stator counterclockwise direction Dccw, which may cause the stopper 22ccw of the stator 110 to collide with the stator abutment portion 4ccw of the stator receiver 4, damaging the generator 101. In this way, in the case of the generator 101, it is impossible to detect in advance an abnormality such as a failure of the limit switch 126 body in an open circuit state or a break in the distribution cable 28, and the abnormality is detected only after the stator 110 becomes uncontrollable.

[0036] On the other hand, the stator 110 is different from the stator 10 in that it has a stator tooth portion 120 instead of the stator tooth portion 20, but is otherwise configured similarly. Compared to the stator tooth portion 20, the stator tooth portion 120 has, for example, two additional teeth in each of the stator clockwise direction Dcw and the stator counterclockwise direction Dccw, and is formed continuously over a wider rotation angle range.

[0037] 7 and 8, the end of the stator teeth 120 of the stator 110 in the stator clockwise direction Dcw is in a position to mesh with the driving gear 32, so that the stator teeth 120 and the driving gear 32 are in a meshed state. That is, the stator teeth 120 are arranged so that when the stator 110 rotates in the stator counterclockwise direction Dccw beyond the maximum stator counterclockwise rotation state, the stopper 22ccw collides with the stator abutment portion 4ccw of the stator receiver 4 while the stator teeth 120 and the driving gear 32 remain in a meshed state. Therefore, in the stator counterclockwise collision state, a rotational driving force is transmitted from the driving motor 30 to the stator 110 via the driving gear 32 and the stator teeth 120.

[0038] Therefore, in the event of a collision in the counterclockwise direction of the stator, excessive loads are applied to the driving motor 30, the driving gear 32, and the periphery of the stator teeth 120 of the generator 101, which may result in damage to these. In such a case, it will take a lot of time and money to restore the generator 101.

[0039] The above describes a case where the stator 110 rotates in the stator counterclockwise direction Dccw from the stator rotation reference state (FIG. 5), the dog 24cw is detected by the limit switch 126cw (FIG. 6), the stopper 22ccw collides with the stator abutment portion 4ccw (FIG. 7), and at that time, the end of the stator tooth portion 120 of the stator 110 in the stator clockwise direction Dccw is in a position to mesh with the drive-side gear 32. On the other hand, the same is true when the stator 110 rotates in the stator clockwise direction Dcw from the stator rotation reference state (FIG. 5), the dog 24ccw is detected by the limit switch 126ccw, the stopper 22cw collides with the stator abutment portion 4cw, and at that time, the end of the stator tooth portion 120 of the stator 110 in the stator counterclockwise direction Dccw is in a position to mesh with the drive-side gear 32.

[0040] [3. Effects, etc.] In the generator 1 configured as described above, the limit switch 26 (limit switches 26cw and 26ccw) which detects the maximum stator counterclockwise rotation state (Figure 2) and the maximum stator clockwise rotation state of the stator 10 by being pushed by the dogs 24 (dogs 24cw and 24ccw) provided on the stator 10, is of the B-contact type.

[0041] Therefore, in the generator 1, when the limit switch 26 body is in an open circuit state and the wiring cable 28 is broken, the limit switch 26 side is open circuited in the same way as when the limit switch 26 is pressed, so that the generator control unit 2 can detect the open circuit from the limit switch 26 side. In this case, the generator 1 immediately cuts off the power supplied to the drive motor 30, thereby stopping the rotation of the drive motor 30 and also stopping the rotation of the stator 10. Therefore, the generator 1 can grasp in advance the failure when the limit switch 26 body is in an open circuit state and the abnormality such as the breakage of the wiring cable 28. This makes it possible for the generator 1 to prevent the stator 10 from rotating in the stator counterclockwise direction Dccw by exceeding the maximum stator counterclockwise rotation state and the stator 10 from rotating in the stator clockwise direction Dcw by exceeding the maximum stator clockwise rotation state, and to prevent the stopper 22 of the stator 10 from colliding with the stator receiver 4, which would damage the generator 1. Thus, even if an abnormality occurs in the generator 1, the generator 1 can be safely stopped while in operation and the cause can be investigated, thereby reducing the time and cost required for recovery.

[0042] 4, the generator 1 is arranged so that the end of the stator tooth portion 20 of the stator 10 in the stator clockwise direction Dcw is located in the stator counterclockwise direction Dccw from the position where it meshes with the drive-side gear 32 in the stator counterclockwise direction collision state. In other words, the generator 1 is arranged so that the stator tooth portion 20 and the drive-side gear 32 are physically separated from each other in the stator counterclockwise collision state, and are not meshed with each other.

[0043] In this manner, in the generator 1, when the generator control unit 2 is unable to stop the driving motor 30 due to various factors and the stator 10 rotates in the stator counterclockwise direction Dccw beyond the maximum stator counterclockwise rotation state, the stator teeth portion 20 is arranged so that the meshing between the stator teeth portion 20 and the driving gear 32 is released just before the stopper 22ccw collides with the stator abutment portion 4ccw of the stator receiver 4. For this reason, in the stator counterclockwise collision state, the rotational driving force of the driving motor 30 is not transmitted from the driving gear 32 to the stator teeth portion 20.

[0044] Therefore, in the generator 1, when the stator 10 rotates in the stator counterclockwise direction Dccw beyond the maximum stator counterclockwise rotation state, the stopper 22ccw can collide with the stator receiver 4 in a state in which the meshing between the stator teeth portion 20 and the drive-side gear 32 is released. The same applies to the case in which the stator 10 rotates in the stator clockwise direction Dcw beyond the maximum stator clockwise rotation state.

[0045] As a result, even if the stator 10 rotates further in the stator counterclockwise direction Dccw from the maximum stator counterclockwise rotation state (Figure 2), in the stator counterclockwise collision state (Figures 3 and 4), the drive side gear 32 will only spin freely, preventing excessive load from being applied to the drive motor 30, the drive side gear 32 and the areas around the stator teeth 20, and preventing them from being damaged.

[0046] According to the above configuration, the generator 1 comprises a stator 10 composed of a stator core 10a and a stator winding 10b and capable of rotating within a predetermined rotation angle range, a rotor 12 which is provided on the inner side of the stator 10 and rotates, a limit switch 26 which is of the b-contact type and detects the rotational position of the stator 10 and electrically outputs the detection result, a drive motor 30 which rotates the stator 10, and a generator control unit 2 which stops the drive motor 30 when an open circuit is detected from the limit switch 26 side.

[0047] As a result, when the generator control unit 2 detects an open circuit from the limit switch 26 side in the event of an abnormality, the generator 1 can stop the rotation of the stator 10 by stopping the drive motor 30.

[0048] [4. Other embodiments] In the above embodiment, the generator 1 is described as causing the stopper 22ccw to collide with the stator abutment portion 4ccw in the stator counterclockwise collision state (FIG. 3), and causing the stopper 22cw to collide with the stator abutment portion 4cw in the stator clockwise collision state. The present invention is not limited to this, and the generator 1 may cause the stopper 22 to collide with stator abutment portions formed at various other positions in the stator counterclockwise collision state and the stator clockwise collision state, as long as the rotation of the stator 10 stops.

[0049] In the above embodiment, the generator 1 has been described as transmitting the rotational driving force of the drive motor 30 to the stator 10 via the drive gear 32 and the stator tooth portion 20. The present invention is not limited to this, and the generator 1 may have various other gears added between the drive gear 32 and the stator tooth portion 20. In that case, it is sufficient that the meshing between the drive gear 32 and the gear that finally meshes with the drive gear 32 is disengaged in the stator counterclockwise collision state and the stator clockwise collision state.

[0050] Furthermore, the present invention is not limited to the above-mentioned embodiment and other embodiments. That is, the scope of application of the present invention extends to an embodiment in which the above-mentioned embodiment and the other embodiments are combined in part or in whole in any manner. The scope of application of the present invention also extends to an embodiment in which a part of the configuration described in any of the above-mentioned embodiment and other embodiments is extracted and replaced or diverted with a part of the configuration of any of the above-mentioned embodiment and other embodiments, or an embodiment in which a part of the extracted configuration is added to any of the embodiments.

[0051] Furthermore, in the above-mentioned embodiment, the generator 1 as a rotating electric machine is configured by the stator 10 as a stator, the rotor 12 as a rotor, the limit switch 26 as a limit switch, the drive motor 30 as a drive source, and the generator control unit 2 as a control unit. However, the present invention is not limited to this, and the rotating electric machine may be configured by a stator, a rotor, a limit switch, a drive source, and a control unit having various other configurations. [Industrial Applicability]

[0052] The present invention can be used in a generator in which the phase of an output waveform is adjusted by rotating a stator. [Explanation of symbols]

[0053] 1, 101...generator, 2...generator control unit, 4...stator holder, 4cw, 4ccw...stator abutment portion, 10, 110...stator, 10a...stator core, 10b...stator winding, 11...air gap, 12...rotor, 12a...rotor core, 12b...rotor winding, 14...rotating shaft, 20, 120...stator teeth portion, 22, 22cw, 22ccw...stopper, 24, 24cw, 24ccw...dog, 26, 26cw, 26ccw, 126, 126cw, 126ccw...limit switch, 28...wiring cable, 30...driving motor, 32...driving side gear, Dcw...stator clockwise direction, Dccw...stator counterclockwise direction, Ra...rotating shaft center, Da...axial direction, Dd...radial direction, Dc...circumferential direction.

Claims

1. a stator that is composed of a stator core and a stator winding and is rotatable within a predetermined rotation angle range; A rotor that is provided on the inner periphery of the stator and rotates; a limit switch that is a b-contact type and detects the rotational position of the stator and electrically transmits the detection result; A drive source that rotates the stator; a control unit that stops the drive source when an open circuit is detected from the limit switch side; A rotating electric motor having the above structure.

2. A wiring cable that connects the limit switch and the control unit and transmits an electrical signal of the detection result of the limit switch. The rotating electric machine according to claim 1 , further comprising:

3. a stator tooth portion formed on an outer peripheral surface of the stator over a predetermined rotation angle range; a driving gear that meshes with the stator teeth to transmit the driving force of the driving source to the stator and rotate the stator; a rotation stopping portion that is provided on the stator and stops the rotation of the stator by abutting against a predetermined stator abutment portion when the stator rotates in a predetermined rotation direction and exceeds a rotation limit state; and When the rotation stop portion comes into contact with the stator contact portion, the engagement between the stator teeth portion and the drive gear is released. The rotating electric machine according to claim 1 .

4. The stator teeth include The rotation stop portion is formed on the side in the predetermined rotation direction of the drive gear when the rotation stop portion abuts against the stator abutment portion. The rotating electric machine according to claim 3 .

5. The control unit adjusts a phase of an output waveform by rotating the stator within the predetermined rotation angle range. The rotating electric machine according to claim 1 .

6. The stator abutment portion is provided on a stator receiver that supports the stator. The rotating electric machine according to claim 3 .

Images