JP2019110613A - Rotary electric machine and vibration suppression method thereof - Google Patents

Abstract

To provide a rotary electric machine capable of suppressing vibration due to resonance corresponding to amplitude of the characteristic frequency of the rotary electric machine against the excitation frequency of the rotary electric machine.SOLUTION: A rotary electric machine comprises: an enclosure 130 which houses a rotor 110 and a stator 120; a heat exchanger 141 which cools a gas having cooled the rotor 110 and the stator 120; and a heat exchanger cover 140 which houses the heat exchanger 141 while being mounted to the enclosure 130. A reinforcement member 135 or a balance weight 160 is fixed to the enclosure 130 so that the characteristic frequency deviates from the excitation frequency corresponding to amplitude of the characteristic frequency of the rotary electric machine 100 against the excitation frequency of the rotary electric machine 100. When the characteristic frequency is higher than the excitation frequency, the reinforcement member 135 is fixed to the enclosure 130, and when the characteristic frequency is lower than the excitation frequency, the balance weight 160 is fixed to the enclosure 130.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotating electrical machine and a method of suppressing vibration of the rotating electrical machine.

  A rotating electrical machine used for a motor for driving a pump, a generator and the like is composed of a rotor, a stator, and a frame for housing these. The frame is provided with a cooler cover for housing a cooler for heat exchange of the refrigerant for cooling the rotor and the stator. Communication openings are formed in the upper, lower, and central portions of the frame, and are opposed to the cooler cover. An inner fan is attached to the rotation shaft of the rotating electric machine, and the inner fan rotates as the rotor rotates, and a cooling gas circulates in the enclosed space formed by the frame and the cooler cover. The gas that has cooled the rotor and the stator is cooled by the cooler in the cooler cover to cool the rotor and the stator again.

  Since the rigidity of the portion of the frame in which the communication opening is formed is lowered, there is a problem that when the rotary electric machine is driven, the natural frequency approaches the rotation frequency and vibration due to resonance occurs. In order to solve this subject, the technique which provided the reinforcement member between the flame | frame and a cooler cover is proposed (patent document 1).

JP, 2016-52169, A

  In the technique described in Patent Document 1, by providing a reinforcing member between the frame and the cooler cover, the rigidity of the rotating electrical machine is secured, and the natural frequency of the rotating electrical machine is shifted to the higher side. Then, by separating the natural frequency of the rotating electrical machine from the rotational frequency of the rotating electrical machine, the occurrence of vibration due to resonance is prevented.

  However, in Patent Document 1, since the rigidity of the rotating electrical machine is secured and the natural frequency of the rotating electrical machine is shifted only to the higher one, the natural frequency and rotation of the rotating electrical machine after securing the rigidity of the rotating electrical machine When the difference in rotational frequency of the electric machine is small, there is a problem that generation of vibration due to resonance can not be suppressed.

  In particular, when the installation state of the rotating electrical machine at the site or when an accessory storage box for storing the control device etc. is attached to the frame of the rotating electrical machine, the natural frequency of the rotating electrical machine changes, so the rigidity of the rotating electrical machine is secured. Even after that, the difference between the natural frequency of the rotating electrical machine and the rotational frequency of the rotating electrical machine may be small, and the generation of vibration due to resonance can not be suppressed.

  Further, a frequency (resonance frequency) twice as high as the rotational frequency acts on the rotor of the rotating electrical machine when it is rotated by the electromagnetic force from the stator. For this reason, it was necessary to take measures against the occurrence of vibration due to the resonance of the natural frequency and the excitation frequency of the rotating electrical machine.

  An object of the present invention is to solve the above-mentioned problems and to provide a rotating electrical machine capable of suppressing vibration due to resonance in accordance with the magnitude of the natural frequency of the rotating electrical machine with respect to the excitation frequency of the rotating electrical machine.

  In order to achieve the above object, the present invention is characterized by a housing for housing a rotor and a stator, a heat exchanger for cooling a gas that has cooled the rotor and the stator, and the housing And a heat exchanger cover for accommodating the heat exchanger, the excitation frequency from the excitation frequency according to the magnitude of the natural frequency of the rotation machine with respect to the excitation frequency of the rotation machine. The reinforcing member or the balance weight is fixed to the housing so that the natural frequency is separated.

  ADVANTAGE OF THE INVENTION According to this invention, according to the magnitude | size of the intrinsic frequency of the rotary electric machine with respect to the excitation frequency of a rotary electric machine, the rotary electric machine which can suppress the vibration by resonance can be provided.

FIG. 1 is an external perspective view of a rotating electrical machine according to a first embodiment of the present invention. It is sectional drawing which cut | disconnected FIG. 1 in the rotating shaft direction. 1 is an exploded perspective view of a rotary electric machine according to a first embodiment of the present invention. It is a top view of the rotary electric machine which removed the heat exchanger cover which concerns on 1st Example of this invention. It is a figure explaining the effect of the rotary electric machine which concerns on 1st Example of this invention. It is a figure which shows an example of the vibration mode of a rotary electric machine. It is a figure which shows the other example of the vibration mode of a rotary electric machine. It is a figure showing the state where the natural frequency of rotation electrical machinery is lower than excitation frequency. It is a top view of the rotary electric machine which removed the heat exchanger cover which concerns on 1st Example of this invention. It is an external appearance perspective view of the extrapolation reinforcement member of the rotary electric machine which concerns on 2nd Example of this invention. It is the elements on larger scale which arranged the extrapolation reinforcement member in the case of the rotary electric machine concerning the 2nd example of the present invention. It is a flowchart which shows the vibration suppression method of the rotary electric machine which concerns on 3rd Example of this invention.

  Hereinafter, an embodiment of a rotating electrical machine according to the present invention will be described based on the drawings. The present invention is not limited to the following embodiments, and includes various modifications and applications within the technical concept of the present invention.

  A first embodiment of the present invention will be described using FIG. 1 to FIG. FIG. 1 is an external perspective view of a rotary electric machine according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of FIG. 1 cut in the rotation axis direction. In the present embodiment, an induction motor will be described as an example of a rotating electrical machine.

  1 and 2, the rotating electrical machine 100 includes a rotor 110, a stator 120, a housing 130 for housing the rotor 110 and the stator 120, and a heat exchanger cover 140 attached to the housing 130. , An accessory storage cover 150 attached to the housing 130. The rotating shaft 111 is attached to the rotor 110. For example, an impeller of a pump is connected to the rotation shaft 111. Bearings 112 and 113 are attached to the housing 130 and pivotally support the rotating shaft 111. The inner fan 114, 115 is attached to the rotating shaft 111 and rotates with the rotor 110.

  In the stator 120, a slot is formed in a stator core formed by laminating a plurality of electromagnetic steel plates, and a stator coil is inserted in the slot. In the rotor 110, a slot is formed in a rotor core formed by laminating a plurality of electromagnetic steel sheets, and a conductor bar is inserted in the slot.

  The heat exchanger 141 is housed in the heat exchanger cover 140. A first communication port 131, a second communication port 132, and a third communication port 133 are formed between the housing 130 and the heat exchanger cover 140. Thereby, the heat exchanger 141 communicates with the internal space of the housing 130 in which the rotor 110 and the stator 120 are stored. A heat transfer pipe (not shown) is connected to the heat exchanger 141, and is connected to a heat exchanger provided outside the rotating electrical machine 100. With this configuration, the heat absorbed by the heat exchanger 141 is dissipated to the outside of the rotary electric machine 100.

  When the rotor 110 rotates, the inner fan fans 114 and 115 rotate, and the gas circulates in the inner space formed by the housing 130 and the heat exchanger cover 140. As indicated by the arrows in FIG. 2, when the inner fan fans 114 and 115 rotate, heat-laden gas flows from the inside of the housing 130 into the heat exchanger cover 140 through the first communication port 131. The gas flowing into the heat exchanger cover 140 passes through the heat exchanger 141, is deprived of heat and cooled, and flows into the housing 130 again through the second communication port 132 and the third communication port 133. The gas flowing into the housing 130 cools the rotor 110 and the stator 120.

  In the rotary electric machine 100 of the present embodiment, the first communication port 131, the second communication port 132, and the third communication port 133 are formed on the side facing the heat exchanger cover 140 among the surfaces constituting the housing 130. The rigidity of the face side is low. In addition, in the present embodiment, the accessory storage cover 150 is attached to the side surface of the housing 130. A control device for controlling the rotary electric machine 100 and the like are housed in the accessory housing cover 150.

  The operation of the rotating electrical machine will be described. A rotating electrical machine is a device that converts rotation of a rotor and power. The rotor has an imbalance around its axis, and a centrifugal force generated by the rotation of the rotor generates an excitation force of rotational frequency in a direction perpendicular to the rotational axis. In addition, the rotor is rotated by the electromagnetic force from the stator, and receives an excitation frequency that is twice the rotational frequency. Therefore, the excitation frequency also acts on the housing and the like.

  On the other hand, in the rotary electric machine, the natural frequency changes due to the balance of the combination of the installation state at the site and the presence or absence of the heat exchanger cover, the accessory storage cover, etc. attached to the housing. If the natural frequency of this vibration mode matches the vibration frequency of the rotating electric machine, the rotating electric machine will resonate, so it is necessary to adjust the mass and stiffness of the housing to separate the natural frequency of the vibration mode from the vibration frequency .

  First, consider the case where the natural frequency of the vibration mode of the rotary electric machine 100 approaches at a frequency higher than the excitation frequency. In this case, in order to move the natural frequency of the vibration mode of the rotary electric machine 100 away from the excitation frequency, the natural frequency of the vibration mode may be shifted to the high frequency side.

  Hereinafter, means for preventing the vibration due to resonance by shifting the natural frequency of the vibration mode to the high frequency side will be described with reference to FIGS. 3 and 4. FIG. 3 is an exploded perspective view of the rotary electric machine according to the first embodiment of the present invention. FIG. 4 is a top view of the rotating electrical machine from which the heat exchanger cover according to the first embodiment of the present invention has been removed.

  The heat exchanger cover 140 is detachably attached to the housing 130 using a bolt (not shown). The housing 130 of the present embodiment has an opening at the side where the heat exchanger cover 140 is attached (opposite side), and is formed in a substantially rectangular parallelepiped as a whole. Through holes 134 are formed in the four surfaces of the housing 130. The through hole 134 is formed in the vicinity of the opening of the housing 130. Reinforcing members 135 are attached to adjacent surfaces of the housing 130. The rigidity of the opening side of the housing 130 is reduced by the formation of the opening. Therefore, the reinforcing member 135 is attached and fixed in the vicinity of the opening of the housing 130 to secure rigidity. A plurality of reinforcing members 135 are provided.

  A reinforcing member 135a is disposed between the through hole 134a and the through hole 134h, and the through hole 134a and the bolt fastening hole 136a are opposed to each other, and the through hole 134h and the bolt fastening hole 136h are opposed to each other. A bolt is inserted from the hole 134 h and tightened to attach the reinforcing member 135 a to the housing 130.

  A reinforcing member 135b is disposed between the through hole 134b and the through hole 134c, and the through hole 134b and the bolt fastening hole 136b are opposed to each other, and the through hole 134c and the bolt fastening hole 136c are opposed to each other. A bolt is inserted from the hole 134 c and tightened to attach the reinforcing member 135 b to the housing 130.

  A reinforcing member 135c is disposed between the through hole 134d and the through hole 134e, and the through hole 134d and the bolt fastening hole 136e are opposed, and the through hole 134e and the bolt fastening hole 136e are opposed to each other. A bolt is inserted from the hole 134 e and tightened to attach the reinforcing member 135 c to the housing 130.

  A reinforcing member 135c is disposed between the through hole 134d and the through hole 134e, and the through hole 134d and the bolt fastening hole 136e are opposed, and the through hole 134e and the bolt fastening hole 136e are opposed to each other. A bolt is inserted from the hole 134 e and tightened to attach the reinforcing member 135 c to the housing 130.

  A reinforcing member 135d is disposed between the through hole 134f and the through hole 134g, and the through hole 134f and the bolt fastening hole 136g are opposed to each other while the through hole 134f and the bolt fastening hole 136f are opposed to each other. A bolt is inserted and tightened from the hole 134g, and the reinforcing member 135d is attached to the housing 130.

  In the present embodiment, the reinforcing member 135 is attached to the housing 130 via the through hole 134. Therefore, even when the side wall of the housing 130 is elastically deformed, the rigidity of the housing 130 can be increased by using the reinforcing member 135, and the natural frequency of the rotary electric machine 100 can be increased. The reinforcing member 135 is disposed to connect the wall surfaces forming the corners of the housing 130. In addition, the reinforcing member 135 can adjust the rigidity of the housing 130 depending on whether or not the bolt is tightened. The reinforcing member 135 of this embodiment is a reinforcing member capable of adjusting the rigidity of the housing 130.

  In the above description, the heat exchanger cover 140 is provided at the upper portion of the housing 130. However, the space attached to the housing and communicating with the space of the housing is also available in addition to the cover for housing the heat exchanger. The present embodiment is applicable as long as the cover forms a cover. The cover may be, for example, a terminal box or the like.

  The effect of the present embodiment will be described with reference to FIG. FIG. 5 is a view for explaining the effect of the rotary electric machine according to the first embodiment of the present invention. The balance weights described in the figure will be described later.

  In FIG. 5, the horizontal axis represents frequency, and the vertical axis represents amplitude. The excitation frequency (frequency twice as high as the rotation frequency) of the rotary electric machine 100 is 2fn indicated by a broken line. The natural frequency of the rotary electric machine 100 before the reinforcing member 135 is attached has a peak value of the natural frequency in a frequency range higher than the excitation frequency 2fn, and the entire natural frequency is spread around the excitation frequency 2fn. For this reason, resonance may occur. In order to avoid the resonance region, it is necessary to shift the natural frequency of the rotary electric machine 100 outside the resonance region.

  According to the present embodiment, since the reinforcing member 135 is attached to the housing 130, the rigidity of the housing 130 is secured, and the natural frequency of the vibration mode of the rotary electric machine 100 is separated from the vibration frequency 2fn to a high frequency range. It is possible to suppress vibration due to resonance.

  In this embodiment, the reinforcing member 135 is provided with two bolt fastening holes 136 and two through holes 134, but one or three or more bolt fastening holes 136 and through holes 134 may be provided. .

  When a plurality of bolt fastening holes 136 of the reinforcing member 135 are provided, bolt fastening may be selectively performed without fastening all the bolts. In that case, the rigidity between the reinforcing member 135 and the housing 130 can be adjusted by the number of bolt fastening.

  Next, the case where two or more vibration modes are present will be described using FIGS. 6 and 7. FIG. 6 is a view showing an example of a vibration mode of the rotating electrical machine. FIG. 7 is a view showing another example of the vibration mode of the rotating electrical machine.

  FIG. 6 shows a state in which the natural frequency of the vibration mode of the rotating electrical machine is lower than the excitation frequency. FIG. 7 shows a state in which the natural frequency of the vibration mode of the rotating electrical machine is higher than the excitation frequency. As shown in FIGS. 6 and 7, an accessory storage cover 150 is attached to the housing 130. When the rotary electric machine 100 is operated, the housing 130 is elastically deformed. In FIG. 6, a wall is provided between the housing 130 and the accessory storage cover 150, and the wall in the rotation axis direction of the housing 130 elastically deforms as shown by the dotted line with the operation of the rotary electric machine 100. . Further, in FIG. 7, no wall is provided between the housing 130 and the accessory storage cover 150, and along with the operation of the rotary electric machine 100, the horizontal wall of the housing 130 is elastic as shown by a dotted line. Deform.

  In the vibration mode of the rotating electrical machine, the natural frequency changes due to changes in the rigidity and mass of the case (presence or absence of the accessory storage cover), and the natural frequency of the rotating electric machine is in a frequency range higher than the excitation frequency 2fn It is distributed or distributed in a low frequency range. In order to secure the rigidity of the housing, it is effective to attach the reinforcing member 135 to the housing 130 as described with reference to FIGS. 3 and 4. However, depending on the relationship between the natural frequency of the rotating electrical machine and the excitation frequency 2fn, securing the rigidity of the case may not result in suppression of resonance. The reason will be described below with reference to FIG.

  FIG. 8 is a diagram showing a state in which the natural frequency of the rotating electrical machine is lower than the excitation frequency. In FIG. 8, the natural frequency of the rotary electric machine 100 before mounting the reinforcing member 135 is in the frequency range where the peak value of the natural frequency is lower than the excitation frequency 2fn, and the entire natural frequency is around the excitation frequency 2fn. It has spread. The natural frequency of the rotary electric machine 100 before the reinforcing member 135 is attached is distributed in the resonance region. In this state, the reinforcing member 135 is attached to the housing 130, and the natural frequency of the rotary electric machine 100 is shifted to a high frequency. However, the natural frequency of the rotary electric machine 100 after the reinforcing member 135 is attached can not leave the resonance region. Therefore, securing the rigidity of the case can not be a means to suppress resonance.

  As a method of coping with the case where the natural frequency of the rotary electric machine 100 is in a frequency range where the peak value of the natural frequency is lower than the excitation frequency 2fn, if the natural frequency of the rotary electric machine 100 is shifted to a low frequency good.

  A means for shifting the natural frequency of the rotary electric machine 100 to a low frequency will be described with reference to FIG. FIG. 9 is a top view of the rotating electrical machine from which the heat exchanger cover according to the first embodiment of the present invention has been removed.

  In FIG. 9, in the present embodiment, the balance weight 160 is attached to a portion of the casing 130 where the amplitude increases when the rotary electric machine 100 is operated. The balance weight 160 is composed of a metal block. When attaching the balance weight 160 to the housing 130, a bolt is inserted and fixed from the through hole 134 (FIG. 3) formed in the housing 130 or is fixed by welding to the housing 130.

  The balance weight 160 attached to the housing 130 has an inertia function to keep the stationary state before the occurrence of the vibration, thereby shifting the natural frequency of the rotary electric machine 100 to a low frequency region it can.

  The effect of this embodiment will be described with reference to FIG. As described above, the natural frequency of the rotary electric machine 100 before mounting the balance weight 160 and the reinforcing member 135 is in a frequency range where the peak value of the natural frequency is lower than the excitation frequency 2fn, and the entire natural frequency is added. It spreads around the vibration frequency 2fn. When the reinforcing member 135 is attached to the housing 130, the natural frequency of the rotary electric machine 100 shifts to a high frequency range, but the natural frequency of the rotary electric machine 100 after shift does not leave the resonance range. On the other hand, after the balance weight 160 is attached to the housing 130, the natural frequency of the rotary electric machine 100 shifts to a low frequency range, and the natural frequency of the rotary electric machine 100 after shift shifts out of the resonance range.

  According to the present embodiment, since the balance weight 160 is attached to the housing 130, even if the peak value of the natural frequency of the rotary electric machine 100 is in a frequency range lower than the excitation frequency 2fn, By the function of inertia, the natural frequency of the vibration mode of the rotary electric machine 100 can be separated from the excitation frequency 2fn to a low frequency range, and vibration due to resonance can be suppressed.

  As shown in FIG. 5, when balance weight 160 is attached to casing 130 when the natural frequency of rotary electric machine 100 is higher than the excitation frequency, the natural frequency of rotary electric machine 100 is in the low frequency range Although shifting, the natural frequency of the rotating electrical machine 100 after shifting does not leave the resonance region. In this case, in place of the balance weight 160, a reinforcing member 135 may be attached.

  In addition, the reinforcing member 135 is attached to the housing 130 in advance with the bolt loosened (temporarily fixed), and after the rotary electric machine 100 is installed on site, the natural frequency of the rotary electric machine 100 is higher than the excitation frequency. The bolt may be tightened in the high state. By tightening the bolt, the rigidity of the housing 130 is secured by the reinforcing member 135, and the natural frequency of the rotary electric machine 100 can be shifted to a high frequency range. In this case, the rigidity of the case 130 by the reinforcing member 135 can be secured without removing the heat exchanger cover 140 after the rotary electric machine 100 is installed on site, and the workability is improved. Conversely, after installing the rotary electric machine 100 on site, if the natural frequency of the rotary electric machine is lower than the excitation frequency, the reinforcement member 135 is left as it is without tightening the bolt, and the balance weight 160 is You may attach it. By attaching the balance weight 160, the natural frequency of the rotary electric machine 100 can be shifted to a low frequency range.

  In the first embodiment of the present invention, four reinforcing members 135 are disposed so as to connect the wall surfaces forming the corners of the housing 130. For example, the housing 130 and the accessory as shown in FIG. If no wall is provided between the housing cover 150 and the housing cover 150, two walls are disposed to connect the wall surfaces forming the corner where the wall is not provided between the housing 130 and the accessory storage cover 150. You may do so. The number of reinforcing members 135 and the mounting position may be appropriately adjusted according to the natural frequency of the rotary electric machine 100.

  As described above, in the first embodiment of the present invention, depending on the magnitude of the natural frequency of the rotating electrical machine with respect to the vibration frequency, the reinforcing member or the balance is placed on the casing so that the natural frequency is separated from the vibration frequency. I try to fix the weight.

  According to the first embodiment of the present invention, the reinforcing member capable of adjusting the rigidity of the casing according to the natural frequency of the rotary electric machine or the balance weight is selected and attached, and the natural frequency of the rotary electric machine is excited by the excitation frequency Since the motor is separated from the vibration, it is possible to suppress the vibration according to the natural frequency of the rotary electric machine.

  Next, a second embodiment of the present invention will be described using FIG. 10 and FIG. The same reference numerals as in the first embodiment denote the same parts as in the first embodiment. In the second embodiment, means for adjusting the natural frequency is provided without removing the heat exchanger cover after the installation of the housing. FIG. 10 is an external perspective view of the extrapolation reinforcing member of the rotary electric machine according to the second embodiment of the present invention. FIG. 11 is a partially enlarged view in which the extrapolation reinforcing member is disposed in the casing of the rotary electric machine according to the second embodiment of the present invention.

  As for the extrapolation reinforcing member 137 (reinforcing member), a bolt fastening hole 136 is formed on one side, and a flange portion 138 is provided on the other side. A through hole 139 is formed in the flange portion 138.

  An opening 130 a for inserting the extrapolation reinforcing member 137 is formed in the housing 130 of the second embodiment. When attaching the extrapolation reinforcing member 137 to the casing 130, the extrapolation reinforcing member 137 is inserted from the opening 130a, and the bolt fastening hole on the insertion side of the extrapolation reinforcing member 137 in the through hole 134 (FIG. 3) of the casing 130 In the state where 136 is put together, the bolt is inserted into the through hole 134 and the bolt fastening hole 136 and tightened. Thereby, the housing 130 and the extrapolation reinforcing member 137 are fastened. Further, the flange portion 138 is brought into contact with the housing 130, and a bolt is inserted from the through hole 139 in a state where the bolt fastening portion (not shown) provided on the housing 130 and the through hole 139 of the flange portion 138 are aligned. The housing 130 and the flange portion 138 of the extrapolation reinforcing member 137 are fastened.

  By arranging and fixing the extrapolation reinforcing member 137 in the housing 130 in this manner, the rigidity can be adjusted even after the housing is installed, and the natural frequency of the rotary electric machine 100 is added as in the first embodiment. It can be separated from the vibration frequency.

  Next, a method of suppressing vibration of the rotating electrical machine will be described with reference to FIG. FIG. 12 is a flowchart showing a method of suppressing vibration of a rotating electrical machine according to a third embodiment of the present invention.

  In FIG. 12, at the installation site of the rotary electric machine 100, installation work of the rotary electric machine is performed (step S201). In the state where the rotary electric machine 100 is installed, the rotary electric machine 100 is operated, and the operation state check and the vibration test of the rotary electric machine 100 are performed (step S202).

  In the vibration test of the rotary electric machine 100, it is determined whether or not there is vibration (step S203). In step S203, when the vibration exceeds the allowable range (YES), it is determined whether the natural frequency of the rotary electric machine 100 is larger or smaller than the excitation frequency 2fn (step S204).

  In step S204, when the natural frequency of the rotary electric machine 100 is larger than the excitation frequency 2fn, the heat exchanger cover 140 is removed (step S205), and the reinforcing member 135 is attached (step S206).

  In step S204, when the natural frequency of the rotary electric machine 100 is smaller than the excitation frequency 2fn, the heat exchanger cover 140 is removed (step S205), and the balance weight 160 is attached (step S206).

  When the attachment of the reinforcing member 135 or the balance weight 160 is completed, the heat exchanger cover 140 is attached (step S208), and it is confirmed whether the vibration of the rotary electric machine 100 is avoided (step S209). After confirming the vibration avoidance of the rotary electric machine 100, the installation of the rotary electric machine 100 is completed (step S210).

  If the vibration is within the allowable range in step S203 (No), the installation of the rotary electric machine 100 is completed (step S210).

  As described above, according to the third embodiment of the present invention, the reinforcement member capable of adjusting the rigidity of the casing according to the natural frequency of the rotary electric machine or the balance weight is selected and attached, and the natural vibration of the rotary electric machine Since the number is separated from the excitation frequency, it is possible to suppress the vibration according to the natural frequency of the rotating electrical machine.

  In addition, when implementing 2nd Example, the removal process of the heat exchanger cover 140 of step S205, and the attachment process of the heat exchanger cover 140 of S208 are abbreviate | omitted.

  In addition, when the reinforcing member 135 is attached to the housing 130 in a temporarily fixed state with a bolt in advance, the heat exchanger cover 140 removal process of step S205 is omitted, and the reinforcing member 135 is temporarily fixed in step S206. It is a process of tightening the bolt.

  The present invention is not limited to the embodiments described above, and includes various modifications. The above-described embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.

  For example, the present invention may be applied to vibration reduction due to resonance at the rotational frequency and the natural frequency of the rotating electrical machine.

  DESCRIPTION OF SYMBOLS 100 rotary electric machine, 110 rotor, 111 rotating shaft, 112 bearing, 113 bearing, 114 inner fan, 115 inner fan, 120 stator, 130 housing, 130a opening, 131 first communication port, 132 second communication port , 133 third communication port, 134 through hole, 134a through hole, 134b through hole, 134c through hole, 134d through hole, 134e through hole, 134f through hole, 134g through hole, 134h through hole, 135 reinforcing member, 135a reinforcing member , 135b reinforcement member, 135c reinforcement member, 135d reinforcement member, 136 bolt fastening hole, 136a bolt fastening hole, 136b bolt fastening hole, 136c bolt fastening hole, 136d bolt fastening hole, 136e bolt fastening hole, 136f bolt fastening hole, 136g bolt Fastening hole, 136 h bolt tightening Hole, 137 extrapolation strong member, 138 flange portion 139 through hole, 140 a heat exchanger cover, 141 heat exchanger, 150 accessory storage cover, 160 balance weight

Claims (15)

A rotating electrical machine comprising: a housing for housing a rotor and a stator; and a cover attached to the housing and forming a space communicating with a space of the housing.
A reinforcing member or a balance weight is fixed to the casing such that the natural frequency is separated from the vibration frequency according to the size of the natural frequency of the rotary machine with respect to the vibration frequency of the rotary machine. Electric rotating machine. In claim 1,
Fixing the reinforcing member to the housing when the natural frequency is greater than the excitation frequency;
A rotary electric machine characterized in that the balance weight is fixed to the case when the natural frequency is smaller than the excitation frequency. In claim 1 or 2,
The rotary electric machine, wherein the housing has an opening on the side where the cover is attached, and the reinforcing member is fixed in the vicinity of the opening. In claim 1 or 2,
The rotary electric machine characterized in that the reinforcing member is fixed by a bolt. In claim 1 or 2,
A rotary electric machine characterized in that an accessory storage cover for housing a control device for controlling the rotary electric machine is attached to the housing. In claim 1,
The rotary electric machine further includes a heat exchanger for cooling the gas that has cooled the rotor and the stator, and the cover is a heat exchanger cover for housing the heat exchanger. . In claim 6,
A first communication port and a second communication port are formed between the housing and the heat exchanger cover, and the heat exchanger and the internal space of the housing in which the rotor and the stator are housed. And a communicating with each other. In claim 7,
An inner fan is provided on the rotation shaft of the rotor,
When the inner fan rotates, gas flows from the inside of the housing into the heat exchanger cover through the first communication port,
The rotary electric machine, wherein the gas passes through the heat exchanger in the heat exchanger cover and then flows from the heat exchanger cover into the housing through the second communication port. In claim 3,
The rotating electrical machine according to claim 1, wherein the casing is formed in a substantially rectangular parallelepiped, and the reinforcing members are provided on adjacent surfaces of the casing. In claim 9,
A rotating electrical machine characterized in that a plurality of the reinforcing members are provided. In claim 1,
The rotating electric machine characterized in that the balance weight is formed of a metal block. In claim 11,
The rotating electric machine, wherein the balance weight is fixed to the housing by bolts or welding. In claim 1 or 2,
The reinforcing member is provided with a flange portion,
The housing is formed with an opening for inserting the reinforcing member.
Inserting the reinforcing member from the opening;
A rotary electric machine characterized in that a bolt is inserted into the insertion side of the reinforcing member and the flange portion and tightened to fix the reinforcing member to the housing. A housing for housing a rotor and a stator, and a cover attached to the housing and forming a space communicating with a space of the housing;
A vibration suppression method for a rotating electrical machine, comprising: a reinforcing member attached to the casing; and a balance weight attached to the casing,
Determining whether the rotating electric machine has vibrations;
Determining whether the natural frequency of the rotating electrical machine is larger or smaller than the excitation frequency when the vibration of the rotating electrical machine exceeds an allowable range;
Attaching a reinforcing member to the housing if the natural frequency of the rotating electrical machine is greater than the excitation frequency;
And a step of attaching a balance weight to the case when the natural frequency of the rotating electrical machine is smaller than a vibration frequency. A housing for housing a rotor and a stator, a cover attached to the housing and forming a space communicating with a space of the housing, a reinforcing member attached to the housing in a temporarily fixed state by bolts in advance A vibration suppression method for a rotating electrical machine, comprising: a balance weight attached to the casing,
Determining whether the rotating electric machine has vibrations;
Determining whether the natural frequency of the rotating electrical machine is larger or smaller than the excitation frequency when the vibration of the rotating electrical machine exceeds an allowable range;
Tightening the bolt and fixing the reinforcing member to the housing if the natural frequency of the rotating electrical machine is greater than the excitation frequency;
And a step of attaching a balance weight to the case when the natural frequency of the rotating electrical machine is smaller than a vibration frequency.

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