JP2013190248A - Diagnostic method and device for rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device capable of diagnosing whether or not a commutator and a brush holder comprising a rotary machine are good in quality while the rotary machine is driving.SOLUTION: A diagnostic device 100 is provided with: a displacement measuring part 5 which is provided at a part facing a sliding contact surface 31 with a commutator 2 of a brush 3 and equipped with a first surface 51 almost parallel to the sliding contact surface and a second surface 52 tilted against the sliding contact surface; a first displacement measurement device 61 for measuring displacement in the direction almost orthogonal to the sliding contact surface of the first surface 51; a second displacement measurement device 62 for measuring displacement in the direction almost orthogonal to the sliding contact surface of the second surface 52; and a signal processor 1 which diagnoses whether or not the commutator 2 is good in quality on the basis of the quantity of displacement of the first surface measured by the first displacement measurement device and diagnoses whether or not a brush holder 4 is good in quality on the basis of a difference between the displacement of the second surface measured by the second displacement measurement device and the displacement of the first surface measured by the first displacement measurement device.

Description

  The present invention relates to a method and apparatus for diagnosing a rotating machine such as a DC motor. In particular, the present invention relates to the quality of the commutator and the brush holder constituting the rotating machine (the quality of the sliding contact surface (commutator surface) with the brush of the commutator and the quality of the inner surface of the brush holder). The present invention relates to a method and an apparatus that can be diagnosed during operation.

  Conventionally, a DC motor is often used as a driving power source for various production facilities such as a steel production line. As is well known, a DC motor includes a field means made of an electromagnet or a permanent magnet, an armature having a wound coil and rotating by the action of a magnetic field formed by the field means, and a commutator to be described later A brush that slides in contact with the armature, and a commutator that rotates together with the armature and supplies a current supplied from the brush to a coil of the armature in a certain direction.

  Here, the commutator is configured by arranging a plurality of commutator pieces in an annular shape. Specifically, as shown in FIG. 1, the shape and arrangement of each commutator piece 21 are designed so that the outer shape of the commutator 2 follows a perfect circle C. More specifically, when the outer shape of the slidable contact surface (commutator surface) 21S of each commutator piece 21 constituting the commutator 2 with the brush 3 is viewed from the rotation axis direction of the commutator 2, the rotation center The shape and arrangement of each commutator piece 21 are designed along a perfect circle C centered on C0.

  The brush is inserted and held in a brush holder. Specifically, as shown in FIG. 1, the brush 3 is vertically moved to an opening provided in the brush holder 4 with a biasing force applied downward by a biasing means (not shown) such as a spring. It is movably fitted.

When the outer shape of the commutator surface deviates from a perfect circle (so-called high bar or low bar occurs) or the inner surface of the brush holder is worn, the brush causes chattering while the commutator is rotating. As shown in FIG. 2, the abrasion of the inner surface 41 of the brush holder 4 is considered to be caused by the side surface 32 of the brush 3 being rubbed against the inner surface 41 of the brush holder 4 as the commutator rotates. When the inner surface 41 of the brush holder 4 changes from an initial state (state indicated by reference numeral 41a in FIG. 2) to a worn state (state indicated by reference numeral 41b in FIG. 2), the brush 3 rectifies the brush 3 accordingly. It swings in a direction substantially parallel to the sliding contact surface 31 with the child.
As described above, when the brush chatters, the commutator surface may be damaged, the life of the brush may be shortened, and a flashover may be caused by a commutation failure. Therefore, of course, when manufacturing a DC motor, it is necessary to arrange the commutator so that the outer shape of the commutator surface follows a perfect circle. It is necessary to regularly manage whether it is along a perfect circle. In addition, it is necessary to periodically manage whether the inner surface of the brush holder is worn.

Here, as a method for managing (diagnosis) whether or not the outer shape of the commutator surface is along a perfect circle, the commutator surface is visually observed with the DC motor stopped (rotation of the commutator stopped). The method has been implemented. More specifically, when the commutator surface rotates while sliding on the brush, the carbon of the brush adheres to the commutator surface, but when the outer shape of the commutator surface deviates from a perfect circle. Since the adhesion state of carbon does not become uniform, whether or not the outer shape of the commutator surface is along a perfect circle is managed (diagnostic) by visually observing this.
Similarly, with respect to the brush holder, a method of visually observing the inner surface of the brush holder in a state where the DC motor is stopped (rotation of the commutator) has been implemented.
However, the above method has a problem that it is a kind of sensory test and lacks quantitativeness and objectivity. In addition, there is also a problem that even when abnormal noise due to brush chattering is detected in the operation check while the DC motor is in operation, diagnosis cannot be made unless the timing of the DC motor is stopped (rotation of the commutator is stopped). In addition, since the wear on the inner surface of the brush holder usually progresses over an extremely long span, the inspection item does not include the wear on the inner surface of the brush holder, or the inspector checks the wear on the inner surface of the brush holder as a cause of abnormal noise. There is also a problem that the response is delayed because it cannot be estimated.

  In view of the above problems, Patent Document 1 discloses a method in which a displacement amount in a direction substantially orthogonal to the sliding contact surface of the brush with the commutator is measured in a state where the commutator is rotating, and the magnitude of the displacement amount is determined. A method for diagnosing the quality of the commutator surface based on the above has been proposed. However, with the method described in Patent Document 1, the quality of the commutator surface can be diagnosed, but the quality of the inner surface of the brush holder cannot be diagnosed.

  Patent Document 2 proposes a method for directly measuring and diagnosing the shape of the commutator surface in the commutator axis direction. However, the method described in Patent Document 2 cannot make a diagnosis in a state where the commutator is rotating. In addition, the quality of the inner surface of the brush holder cannot be diagnosed.

  The above-mentioned problems are not limited to DC motors, but are applicable to rotating machines equipped with a commutator, a brush slidably contacting the commutator, and a brush holder for inserting and holding the brush, such as a wound motor and a generator. It is a common problem.

JP 2006-71533 A JP 2008-249364 A

  The present invention has been made to solve the above-described problems of the prior art, and a method capable of diagnosing the quality of the commutator and the brush holder constituting the rotating machine during operation of the rotating machine, and It is an object to provide an apparatus.

In order to solve the above problems, the present inventors have
(1) When the outer shape of the commutator surface deviates from a perfect circle, the brush that comes into sliding contact with the commutator rotates in a direction substantially perpendicular to the sliding contact surface of the brush with the commutator. Moving,
(2) When the inner surface of the brush holder is worn, the brush swings in a direction substantially parallel to the sliding contact surface as the commutator rotates (see FIG. 2).
Focused on.

The inventors of the present invention include a first surface that is substantially parallel to the sliding contact surface and a second surface that is inclined with respect to the sliding contact surface at a portion facing the sliding contact surface with the commutator of the brush. If the displacement amount measuring unit is provided, the displacement amount of the first surface in the direction substantially orthogonal to the sliding contact surface corresponds to the displacement amount in the direction approximately orthogonal to the sliding contact surface of the brush as it is. The difference between the displacement amount of the second surface and the displacement amount of the first surface in the direction substantially perpendicular to the contact surface has a positive or negative correlation with the displacement amount in a direction substantially parallel to the sliding contact surface of the brush (for example, If the second surface is inclined by 45 ° with respect to the sliding contact surface, the difference between the displacement amount of the second surface and the displacement amount of the first surface is substantially parallel to the sliding contact surface of the brush. Corresponds to the amount of displacement in the direction).
Therefore, it has been conceived that if the displacement amount of the first surface and the second surface is quantitatively measured, it is possible not only to diagnose the quality of the commutator surface but also to diagnose the quality of the inner surface of the brush holder. .

The present invention has been completed based on the above findings of the present inventors.
That is, in order to solve the above-mentioned problem, the present invention provides a diagnostic method for a rotating machine comprising a commutator, a brush that is in sliding contact with the commutator, and a brush holder that is inserted and held by the brush. Displacement measuring unit comprising a first surface substantially parallel to the slidable contact surface and a second surface inclined with respect to the slidable contact surface at a portion facing the slidable contact surface with the commutator, In a state where the commutator is rotating, the first surface and the second surface of the displacement amount measuring unit are each measured for the displacement amount in a direction substantially perpendicular to the sliding contact surface, and the measured first surface. The commutator is diagnosed as good or bad based on the amount of displacement of the brush holder, and based on the difference between the measured displacement amount of the second surface and the displacement amount of the first surface, the quality of the brush holder is judged as good or bad. A diagnostic method for a rotating machine is provided.

According to the present invention, in the state where the commutator is rotating, the displacement amount of the first surface of the displacement amount measuring unit, that is, the displacement amount in the direction substantially orthogonal to the sliding contact surface with the commutator of the brush is measured. Therefore, the outer shape of the commutator surface (the distance between the rotation center of the commutator and the commutator surface) is indirectly measured. Therefore, since the magnitude of the displacement amount of the first surface is an index indicating how far the outer shape of the commutator surface is out of a perfect circle, the quality of the commutator surface is determined based on the magnitude of the displacement amount of the first surface. Can be diagnosed.
In addition, according to the present invention, the difference between the displacement amount of the second surface and the displacement amount of the first surface of the displacement amount measurement unit measured in a state where the commutator is rotating, that is, the sliding of the brush with the commutator of the brush. Since the displacement amount has a positive or negative correlation with the displacement amount in a direction substantially parallel to the contact surface, the wear amount on the inner surface of the brush holder is indirectly calculated. Therefore, it is possible to diagnose the quality of the inner surface of the brush holder based on the difference between the displacement amount of the second surface and the displacement amount of the first surface.

  The “displacement measuring unit” in the present invention is formed on the brush itself (that is, processed so that the portion facing the sliding contact surface with the commutator of the brush has the first surface and the second surface. ), Or provided separately from the brush (for example, attached to a portion facing the sliding contact surface with the brush commutator).

  In order to solve the above-mentioned problem, the present invention provides a diagnostic apparatus for a rotating machine comprising a commutator, a brush slidably contacting the commutator, and a brush holder for inserting and holding the brush. A displacement measuring unit provided at a portion facing the slidable contact surface with the commutator, and comprising a first surface substantially parallel to the slidable contact surface and a second surface inclined with respect to the slidable contact surface; A first displacement measuring device for measuring a displacement in a direction substantially perpendicular to the sliding contact surface of the first surface of the displacement measuring unit; and a sliding contact surface of the second surface of the displacement measuring unit. Based on the magnitude of the displacement amount of the first surface measured by the second displacement amount measuring device that measures the displacement amount in a substantially orthogonal direction and the first displacement amount measuring device, the quality of the commutator is diagnosed, Before measuring with the displacement amount of the second surface measured with the second displacement measuring device and with the first displacement measuring device Based on the magnitude of the difference between the displacement amount of the first surface, is provided as a diagnostic device for a rotary machine, characterized in that it comprises a signal processing unit for diagnosing the quality of the brush holder.

  As the first displacement amount measuring device and the second displacement amount measuring device, displacement amounts of the first surface and the second surface of the displacement amount measuring unit (displacement in a direction substantially perpendicular to the sliding contact surface with the commutator of the brush) As long as it can measure (quantity), various devices can be applied regardless of contact type or non-contact type, but a non-contact type displacement measuring device represented by a laser displacement meter is preferable.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to diagnose the quality of the commutator and brush holder which comprise a rotary machine, while a rotary machine is working.

FIG. 1 is an explanatory diagram for explaining a normal arrangement state of commutators. FIG. 2 is an explanatory diagram for explaining wear on the inner surface of the brush holder. FIG. 3 is a diagram showing a schematic configuration of a diagnostic apparatus for carrying out a DC motor diagnostic method according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a configuration example in the vicinity of the displacement measuring unit in the diagnostic apparatus illustrated in FIG. 3. FIG. 5 is an explanatory diagram for explaining the diagnosis logic of the commutator and the brush holder in the signal processing apparatus shown in FIG.

  Hereinafter, an embodiment of a diagnosis method for a rotating machine according to the present invention will be described by taking as an example a case where the rotating machine is a DC motor with reference to the attached drawings as appropriate.

FIG. 3 is a diagram showing a schematic configuration of a diagnostic apparatus for carrying out a DC motor diagnostic method according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a configuration example in the vicinity of the displacement measuring unit in the diagnostic apparatus illustrated in FIG. 3.
As shown in FIG. 3, the DC motor of this embodiment is given a biasing force downward by an armature 7, a commutator 2 that rotates together with the armature 7, and a biasing means (not shown) such as a spring. A brush (carbon brush) 3 that is in sliding contact with the commutator 2 and a brush holder 4 through which the brush 3 is inserted and held.
As shown in FIGS. 3 and 4, the diagnostic device 100 according to the present embodiment includes a displacement amount measuring unit 5, a first displacement amount measuring device 61, a second displacement amount measuring device 62, and a signal processing device. 1.

The displacement measuring unit 5 is provided at a portion 32 facing the sliding contact surface 31 with the commutator 2 of the brush 3, and is inclined with respect to the first surface 51 substantially parallel to the sliding contact surface 31 and the sliding contact surface 31. And a second surface 52 (inclined with respect to the rotation direction of the commutator 2).
As shown in FIGS. 4A and 4B, the displacement measuring unit 5 may be formed on the brush 3 itself. That is, the displacement measuring unit 5 may be formed by processing the portion 32 of the brush 3 that faces the slidable contact surface 31 with the commutator 2 so as to have the first surface 51 and the second surface 52. If the formation location of the 1st surface 51 and the 2nd surface 52 is a position which does not interfere with urging means (not shown), such as a spring which gives urging | biasing force downward to the brush 3, FIG. (B) It is possible to form not only the form but arbitrary positions.
In addition, as shown in FIG. 4C, the displacement measuring unit 5 can be provided separately from the brush 3. In the example shown in FIG. 4C, the displacement measuring unit 5 is attached (inserted) to a portion 32 facing the sliding contact surface 31 with the commutator 2 of the brush 3. The configuration shown in FIG. 4C is advantageous in that the same displacement measuring unit 5 can be used repeatedly even after the brush 3 is replaced due to its life.

In order to increase the measurement sensitivity (measurement resolution) of the displacement amount in the direction substantially parallel to the sliding contact surface 31 of the brush 3, the second surface 52 shown in FIGS. 4A to 4C with respect to the sliding contact surface 31. It is desirable to make the inclination angle θ as close to 90 ° as possible. On the other hand, if the tilt angle θ is excessively large, when a laser displacement meter is used as the second displacement measuring device 62, the amount of reflected light from the second surface 52 that can receive light may decrease, and the measurement accuracy may deteriorate. is there. For this reason, the inclination angle θ should be set to an appropriate value in consideration of both the measurement sensitivity and the amount of reflected light.
4A to 4C show an example in which the second surface 52 is linearly inclined, the present invention is not limited to this, and the second surface 52 is curved. (The inclination angle θ changes along a direction parallel to the sliding contact surface 31).

  The first displacement measuring device 61 measures a displacement of the first surface 51 of the displacement measuring unit 5 (a displacement in a direction substantially perpendicular to the sliding contact surface 31. In this embodiment, a displacement in the vertical direction). It is. The first displacement measuring device 61 of the present embodiment is a laser displacement meter, which projects laser light L1 toward the first surface 51 substantially vertically downward, and detects the reflected light to provide a laser. The displacement amount of the distance from the emission surface to the laser irradiation surface (that is, the distance to the first surface 51) is measured. When the outer shape of the slidable contact surface (commutator surface) 21S of each commutator piece 21 constituting the commutator 2 with the brush 3 deviates from a perfect circle, the commutator 2 slidably contacts with the rotation of the commutator 2. Since the brush 3 swings in the direction substantially orthogonal to the slidable contact surface 31 with respect to the brush holder 4 (in this embodiment, it moves up and down), the first displacement measuring device 61 displaces the distance to the first surface 51. By measuring the amount, it is possible to indirectly measure the deviation of the commutator surface 21S from the perfect circle.

  The second displacement measuring device 62 measures the displacement of the second surface 52 of the displacement measuring unit 5 (displacement in a direction substantially perpendicular to the sliding contact surface 31. In this embodiment, the displacement in the vertical direction). It is. The second displacement amount measuring device 61 of the present embodiment is also a laser displacement meter, which projects laser light L2 toward the second surface 52 substantially vertically downward, and detects the reflected light to provide a laser. The displacement amount of the distance from the emission surface to the laser irradiation surface (that is, the distance to the second surface 52) is measured. When the inner surface of the brush holder 4 is worn, the brush 3 that comes into sliding contact with the rotation of the commutator 2 swings in a direction substantially parallel to the sliding contact surface 31 with respect to the brush holder 4 ( In this embodiment, it moves left and right). At this time, since the second surface 52 is inclined with respect to the sliding contact surface 31 as described above, the displacement amount of the distance to the second surface 52 measured by the second displacement amount measuring device 62 is the brush 3. It will change depending on the left and right movements. However, the displacement amount of the distance to the second surface 52 measured by the second displacement amount measuring device 62 is the same as that of the first surface 51, and the upper and lower surfaces of the brush 3 due to the deviation of the commutator surface 21S from the perfect circle. It also changes by movement. That is, the displacement amount of the distance to the second surface 52 measured by the second displacement amount measuring device 62 changes under the influence of both the left and right movements and the vertical movements of the brush 3. Therefore, in order to consider only the influence of the lateral movement of the brush 3 due to the wear of the inner surface of the brush holder 4, the displacement amount of the distance to the second surface 52 measured by the second displacement amount measuring device 62, If the difference from the displacement amount of the distance to the first surface 51 measured by the one displacement amount measuring device 61 is evaluated, the wear amount of the inner surface of the brush holder 4 can be indirectly evaluated.

  The signal processing apparatus 1 according to the present embodiment includes an input / output interface with the first displacement amount measuring device 61 and the second displacement amount measuring device 62, and the first displacement amount measuring device 61 and the second displacement amount measuring device 62. The output (displacement amount) is taken in and displayed, and the commutator 2 and the brush holder 4 are diagnosed as good or bad, and a program for outputting an alarm is installed.

FIG. 5 is an explanatory diagram for explaining the diagnostic logic of the quality of the commutator and the brush holder in the signal processing device.
As shown in FIG. 5A, the signal processing device 1 takes in the output of the first displacement measuring device 61 (the displacement of the first surface 51). Further, as shown in FIG. 5B, the signal processing device 1 takes in the output of the second displacement measuring device 62 (the displacement of the second surface 52).

  The signal processing device 1 diagnoses the quality of the commutator 2 based on the magnitude of the displacement of the first surface 51 that has been taken in. More specifically, in the present embodiment, as shown in FIG. 5A, the upper limit threshold value L11 and the lower limit threshold value L21 of the displacement amount of the first surface 51 are set in advance and the signal processing device. 1 is stored. In the signal processing device 1, the maximum value and the minimum value (maximum value and minimum value within a predetermined evaluation time) of the displacement amount of the first surface 51 captured as described above exceed the threshold values L11 and L21, respectively. Determine whether or not. In the example shown in FIG. 5 (a), the maximum value within the time period (corresponding to the time for which the commutator 2 makes one rotation) and “normal (ideal)”, “allowable range”, and “abnormal” It is determined whether or not the minimum value exceeds the threshold values L11 and L21. If at least one of the maximum value and the minimum value exceeds the threshold value (the maximum value is larger than the threshold value L11 and / or the minimum value is smaller than the threshold value L21). The commutator 2 is defective (the outer shape of the commutator surface 21S is not along a perfect circle), and an alarm is output.

  Further, the signal processing apparatus 1 calculates a difference (hereinafter referred to as “displacement amount difference”) between the displacement amount of the second surface 52 and the displacement amount of the first surface 51 that has been taken in, and increases or decreases the displacement amount difference. Based on this, the quality of the brush holder 4 is diagnosed. More specifically, in this embodiment, as shown in FIG. 5C, the upper limit threshold value L12 and the lower limit threshold value L22 of the displacement amount difference are preset and stored in the signal processing device 1. ing. The signal processing apparatus 1 determines whether or not the maximum value and the minimum value (maximum value and minimum value within a predetermined evaluation time) of the displacement amount difference calculated as described above exceed the threshold values L12 and L22, respectively. to decide. In the example shown in FIG. 5C, the time is divided into “normal (ideal)”, “abnormal (forward rotation)”, and “abnormal (reverse rotation)” (corresponding to the time when the commutator 2 makes one rotation). It is determined whether or not the maximum value and the minimum value in () exceed the threshold values L12 and L22, respectively. If at least one of the maximum value and the minimum value exceeds the threshold value (the maximum value is larger than the threshold value L12 and / or the minimum value is smaller than the threshold value L22). The brush holder 4 is diagnosed as defective (the inner surface of the brush holder 4 is worn), and an alarm is output.

As described above, the diagnostic device 100 according to the present embodiment has the displacement amount of the first surface 51 of the displacement amount measurement unit 5, that is, the commutator 2 of the brush 3 and the commutator 2 in a state where the commutator 2 is rotating. Since the displacement amount in the direction substantially perpendicular to the sliding contact surface 31 is measured, the outer shape of the commutator surface 21S is indirectly measured. Therefore, the magnitude of the displacement amount of the first surface 51 is an index indicating how far the outer shape of the commutator surface 21S is out of a perfect circle, and therefore the commutator is based on the magnitude of the displacement amount of the first surface 51. It is possible to diagnose the quality of the surface 21S.
Further, the diagnostic device 100 according to the present embodiment is configured such that the difference between the displacement amount of the second surface 52 and the displacement amount of the first surface 51 of the displacement amount measurement unit 5 measured in a state where the commutator 2 is rotating, That is, since the displacement amount having a positive or negative correlation with the displacement amount in a direction substantially parallel to the slidable contact surface 31 of the brush 3 with the commutator 2 is calculated, the wear on the inner surface of the brush holder 4 is indirectly induced. The amount will be calculated. Therefore, it is possible to diagnose the quality of the inner surface of the brush holder 3 based on the difference between the displacement amount of the second surface 52 and the displacement amount of the first surface 51.
Further, by periodically confirming the measurement results of the displacement amounts of the first surface 51 and the second surface 52 displayed by the diagnostic device 100 according to the present embodiment, it is possible to manage the tendency of the progress of defects. Is possible. Moreover, since the diagnostic apparatus 100 according to the present embodiment outputs an alarm that the commutator 2 or the brush holder 4 is defective, it is possible to take an early action against the defect.

  In addition, since the diagnostic apparatus 100 according to the present embodiment is applied to a rotating machine in which the brush 3 is in sliding contact with the commutator 2 vertically above, the laser light L1 emitted from the first displacement measuring device 61 and the second The laser light L2 emitted from the displacement measuring device 62 is projected substantially vertically downward toward the first surface 51 and the second surface 52 of the displacement measuring unit 5, respectively. However, the present invention is not limited to this. For example, when the brush 3 is applied to a rotating machine configured to be in sliding contact with the commutator 2 in the horizontal direction (the left-right direction in FIG. 3), the first displacement measuring device. The laser beam L1 emitted from 61 and the laser beam L2 emitted from the second displacement measuring device 62 are projected in a substantially horizontal direction toward the first surface 51 and the second surface 52 of the displacement measuring unit 5, respectively. Just do it. That is, the first displacement measuring device 61 and the second displacement are determined according to the mounting position of the brush 3 so that the displacement in the direction substantially perpendicular to the sliding surface 31 of the first surface 51 and the second surface 52 can be measured. What is necessary is just to determine the laser beam emission direction of the quantity measuring device 62.

  In the present embodiment, a configuration in which the signal processing device 1 configured by a general-purpose personal computer is directly connected to the first displacement amount measuring device 61 and the second displacement amount measuring device 62 via the input / output interface will be described. did. However, the present invention is not limited to this, and a data logger excellent in electromagnetic noise resistance is disposed beside the rotating machine, and the first displacement measuring device 61 and the second displacement measuring device 62 are arranged on the data logger. Once the output is recorded, the data recorded in the data logger is read by the signal processing device 1 composed of a personal computer arranged so as not to cause a problem of electromagnetic noise from the rotating machine, It is also possible to adopt a mode in which the same processing as described above is performed.

  Furthermore, in the present embodiment, the configuration for diagnosing the quality of the brush holder 4 based on whether the maximum value and the minimum value of the displacement amount difference exceed the upper threshold L12 and the lower threshold L22 has been described. The invention is not limited to this, and it may be configured to diagnose whether the brush holder 4 is good or not based on whether or not the difference between the maximum value and the minimum value of the displacement amount difference exceeds a predetermined reference value.

DESCRIPTION OF SYMBOLS 1 ... Signal processing device 2 ... Commutator 3 ... Brush 4 ... Brush holder 5 ... Displacement measuring part 7 ... Armature 21S ... Commutator surface 31 ... Slide Contact surface 51... First surface 52... Second surface 61... First displacement amount measuring device 62... Second displacement amount measuring device 100.

Claims (3)

A diagnostic method for a rotating machine comprising a commutator, a brush slidably contacting the commutator, and a brush holder for inserting and holding the brush,
A displacement measuring unit having a first surface substantially parallel to the slidable contact surface and a second surface inclined with respect to the slidable contact surface at a portion facing the slidable contact surface of the brush with the commutator; Provided,
In the state where the commutator is rotating, the displacement amount in the direction substantially orthogonal to the sliding surface of the first surface and the second surface of the displacement amount measurement unit, respectively,
The commutator is diagnosed based on the measured displacement amount of the first surface, and based on the difference between the measured displacement amount of the second surface and the displacement amount of the first surface. A diagnostic method for a rotating machine, wherein the quality of the brush holder is diagnosed. A diagnostic device for a rotating machine comprising a commutator, a brush that is in sliding contact with the commutator, and a brush holder that is inserted and held through the brush,
Displacement measurement provided on a portion of the brush facing the slidable contact surface with the commutator and comprising a first surface substantially parallel to the slidable contact surface and a second surface inclined with respect to the slidable contact surface. And
A first displacement measuring device that measures a displacement in a direction substantially orthogonal to the sliding surface of the first surface of the displacement measuring unit;
A second displacement measuring device for measuring a displacement in a direction substantially orthogonal to the sliding surface of the second surface of the displacement measuring unit;
Based on the magnitude of the displacement amount of the first surface measured by the first displacement measuring device, the commutator is diagnosed as good or bad, and the displacement amount of the second surface measured by the second displacement measuring device and A signal processing device for diagnosing the quality of the brush holder based on the difference between the displacement amount of the first surface measured by the first displacement amount measuring device;
A diagnostic apparatus for a rotating machine comprising:   The diagnostic apparatus for a rotating machine according to claim 2, wherein the first displacement amount measuring device and the second displacement amount measuring device are laser displacement meters.

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