JP2008157663A - Abnormality determining apparatus for rotation speed sensor, and abnormality determining apparatus for bearing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abnormality determining apparatus for a rotation speed sensor that detects abnormalities in the rotation speed sensor or a sensor cable, and improving the reliability for detecting an abnormality, such as, flaws and peeling in a bearing. <P>SOLUTION: The abnormality determining apparatus of a bearing apparatus 14 determines abnormalities in the bearing apparatus 14, based on detection results from the electromagnetic coil rotation speed sensor for detecting rotation speed signal that varies in response to a rotation of a shaft supported by the bearing apparatus 14 as a voltage induced in a coil 32; a vibration sensor for detecting the vibration in the bearing apparatus 14 and a temperature sensor for detecting the temperature in the bearing apparatus 14, and comprises a power supply Vs for applying a DC voltage to the coil 32; a low-pass filter 40 connected to the output terminal of the coil 32; and two comparators 42, 44 that compare the output voltage Vb from the low-pass filter 40 to a predetermined voltage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for determining an abnormality related to an electromagnetic coil type rotational speed sensor, and in particular, can detect an abnormality of a rotational speed sensor or a sensor cable, and can also detect reliability of abnormality such as a scratch or peeling of a bearing. The present invention relates to an abnormality determination device for a rotational speed sensor and an abnormality determination device for a bearing device that are suitable for improvement.

Conventionally, as a technology for monitoring the operation state of a bearing, a bearing sensor such as a vibration sensor is attached in the vicinity of the bearing device, and the detection signal of the bearing sensor is taken into the operation state monitoring device, and the operation of the bearing is performed in the operation state monitoring device. The status is monitored. For example, the techniques described in Patent Documents 1 and 2 are widely known.
FIG. 6 is a view showing a mounting structure of the bearing sensor described in Patent Document 1. As shown in FIG.

As shown in FIG. 6, the bearing D is fitted into the housing 140, and a cover 144 that covers the end cap 28 is fitted to the end of the housing 140. The cover 144 is provided with a module hole 152, and the module hole 152 is disposed to face outward from the target wheel 118 on the end cap 28 and receives the bearing sensor B.
In the bearing sensor B, a rotation speed sensor, a vibration sensor, a temperature sensor, and the like are provided. Since the rotation speed sensor outputs a sine wave or pulse signal having a frequency proportional to the rotation speed of the rotation shaft, the rotation speed can be recognized by measuring the period of the output waveform. And the state of the bearing D is monitored based on the detection signal of these sensors.

The technology described in Patent Document 2 holds a rotation speed sensor, a temperature sensor, and a vibration sensor in a sensor holder, determines whether there is an abnormality in the double-row tapered roller bearing based on detection signals from the temperature sensor and the vibration sensor, and rotates the rotation sensor. The threshold for abnormality determination is changed based on the detection signal of the speed sensor.
Special table 2001-500707 gazette JP 2002-295464 A

However, in the technique described in Patent Document 1, when a detection signal is not output from the rotation speed sensor due to a cause such as an abnormality in the rotation speed sensor or a disconnection or a short circuit in the sensor cable, Since it cannot be distinguished from the case where the rotating shaft is stopped, there has been a problem that an abnormality of the rotational speed sensor or the sensor cable cannot be detected.
In the technique described in Patent Document 1, since the operating state of the bearing is determined from the magnitude of the detection signal of the vibration sensor, it is difficult to detect an abnormality such as a scratch or peeling of the bearing at an early stage. On the other hand, in the technique described in Patent Document 2, it is possible to detect an abnormality such as a scratch or peeling of the bearing based on detection signals of the vibration sensor and the rotation speed sensor. In this case, it is possible to detect an abnormality at an early stage in order to determine an abnormality by analyzing a specific frequency component of vibration such as a scratch or peeling of the bearing.

  However, in the technique described in Patent Document 2, if a detection signal is not output from the rotation speed sensor due to an abnormality in the rotation speed sensor or the sensor cable during operation, it is not possible to detect a damage or separation of the bearing. . Further, when there is no output from the rotation speed sensor, it is the same as when the rotation axis is stopped, so that it is impossible to recognize an abnormality in the rotation speed sensor or the sensor cable. Therefore, it may be erroneously determined that there is no damage or peeling of the bearing and that it is a normal operating condition.

  Therefore, the present invention has been made paying attention to such an unsolved problem of the conventional technology, and can detect an abnormality in the rotational speed sensor or the sensor cable, and can also damage or peel off the bearing. It is an object of the present invention to provide an abnormality determination device for a rotational speed sensor and an abnormality determination device for a bearing device that are suitable for improving the reliability of abnormality detection.

  [Invention 1] In order to achieve the above object, an abnormality determination device for a rotation speed sensor according to Invention 1 determines an abnormality related to an electromagnetic coil rotation speed sensor that outputs a rotation speed signal having a frequency proportional to the rotation speed of a rotating body. An abnormality determination device that applies a DC voltage to the electromagnetic coil and detects a change in current of a DC component that flows through the coil, thereby detecting an abnormality in wiring to the electromagnetic coil rotational speed sensor or the coil. An abnormality determining means for determining presence or absence is provided.

The rotational speed sensor outputs a signal having a frequency proportional to the rotational speed.
With such a configuration, since a DC voltage is applied to the coil by the power source, when an abnormality occurs in the electromagnetic coil type rotational speed sensor or the wiring to the coil, the current flowing through the coil changes. Then, the abnormality determination means determines whether there is an abnormality in the electromagnetic coil type rotational speed sensor or the wiring to the coil in accordance with the change in the current flowing through the coil.
During normal operation, a rotational speed signal can be obtained by extracting an AC component from the output signal of the rotational speed sensor.

  [Invention 2] On the other hand, in order to achieve the above object, the abnormality determination device for a bearing device according to Invention 2 is an electromagnetic coil rotation speed that outputs a rotation speed signal having a frequency proportional to the rotation speed of the shaft supported by the bearing device. An abnormality determination device for a bearing device that determines an abnormality of the bearing device based on a detection result of a sensor and a vibration sensor that detects vibration of the bearing device, wherein a DC voltage is applied to the electromagnetic coil, By detecting a change in the current of the flowing direct current component, the electromagnetic coil type rotational speed sensor or an abnormality determining means for determining whether there is an abnormality in the wiring to the coil is provided.

With such a configuration, since a DC voltage is applied to the coil by the power source, when an abnormality occurs in the electromagnetic coil type rotational speed sensor or the wiring to the coil, the current flowing through the coil changes. Then, the abnormality determination means determines whether there is an abnormality in the electromagnetic coil type rotational speed sensor or the wiring to the coil in accordance with the change in the current flowing through the coil.
During normal operation, a rotational speed signal can be obtained by extracting an AC component from the current flowing through the coil.

  [Invention 3] Further, the abnormality determination device for a bearing device according to Invention 3 is the abnormality determination device for a bearing device according to Invention 2, wherein the bearing device is a bearing device for a railway vehicle or an automobile.

  As described above, according to the abnormality determination device for the rotational speed sensor of the first aspect of the invention or the abnormality determination device for the bearing device of the second aspect, it is possible to detect an abnormality of the electromagnetic coil type rotational speed sensor or the wiring to the coil. The effect is obtained. In addition, since it is possible to determine the abnormality of the bearing device in consideration of the presence or absence of abnormality of the electromagnetic coil type rotational speed sensor or the wiring to the coil, it is possible to improve the reliability of abnormality detection such as scratches and peeling of the bearing. The effect that it is possible is also acquired.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 to 4 are diagrams showing a first embodiment of an abnormality determination device for a rotational speed sensor and an abnormality determination device for a bearing device according to the present invention.
In the present embodiment, the abnormality determination device for a rotational speed sensor and the abnormality determination device for a bearing device according to the present invention are applied to the case where the operation state of a bearing in a railway vehicle 100 is monitored as shown in FIG. is there.

First, the structure of the driving | running state monitoring system to which this invention is applied is demonstrated.
FIG. 1 is a block diagram showing the configuration of the operating state monitoring system.
FIG. 2 shows the configuration of one vehicle.
As shown in FIG. 1, an operation state monitoring device 20 is installed in the railway vehicle 100. The rail vehicle 100 is supported by two carriages.

  As shown in FIG. 2, the single carriage includes two axles, four wheels 10 attached to end portions of the axles, and four bearing devices 14 provided in the vicinity of the wheels. ing. Each bearing device 14 is provided with a bearing sensor 12 for monitoring the operating state of the bearing. The bearing sensor 12 includes a vibration sensor, a temperature sensor, and an electromagnetic coil type rotational speed sensor.

  Note that the vibration sensor, the temperature sensor, and the electromagnetic coil type rotational speed sensor may be provided separately, or the vibration sensor, the temperature sensor, and the electromagnetic coil type rotational speed sensor may be integrated into one housing. In FIG. 2, only the sensor signal for one vehicle is input to the driving state monitoring device 20, but the sensor signal for two vehicles (for one vehicle) is input as shown in FIG. Also good.

Next, the circuit configuration of the operating state monitoring system will be described.
FIG. 3 is a diagram illustrating a circuit configuration of the operation state monitoring system according to the first embodiment.
As shown in FIG. 3, the operating state monitoring system includes an electromagnetic coil type rotational speed sensor that is a bearing sensor 12 and an operating state monitoring device 20.
The electromagnetic coil type rotational speed sensor is arranged in the vicinity of an annular permanent magnet 30 that is alternately magnetized with S poles and N poles in the circumferential direction and fixed to an axle, and in the vicinity of the permanent magnet 30. And a fixed coil 32. In the example of FIG. 3, the permanent magnet 30 is magnetized so that the circumference is equally divided into six so that N poles and S poles appear alternately in each section. Period changes. The coil 32 detects an induced voltage corresponding to the magnetic flux change as a rotation speed signal. The rotation speed signal is a signal having a frequency proportional to the rotation speed.

The operating state monitoring device 20 includes a power source Vs, three resistors R1, R2, and R3 connected in series to the power source Vs in that order, and a low-pass filter 40 having an input terminal connected between the resistors R1 and R2. The two comparators 42 and 44 compare the output voltage of the low-pass filter 40 with a predetermined voltage.
One end of the resistor R2 is connected to one end of the coil 32 via the sensor cable L1, and the other end of the resistor R2 is connected to the other end of the coil 32 via the sensor cable L2. Therefore, the rotation speed signal can be obtained by obtaining the output voltage Vo of the resistor R2.

Vo is an output signal of the electromagnetic coil type rotational speed sensor, and a sine wave having a frequency proportional to the rotational speed is output. The rotational speed can be obtained by measuring the period of the output voltage Vo or performing F / V conversion.
FIG. 4 is a graph showing changes in the output voltage Vo.
As shown in FIG. 4, the output voltage Vo has an offset voltage Vb. The offset voltage Vb is determined by the resistors R1, R2, R3 and the DC resistance Rc of the coil 32, and changes depending on the current of the DC component flowing in the coil 32. Therefore, by detecting this change in current, the coil 32 or the sensor cable L1 is detected. , It can be detected that a disconnection or a short circuit has occurred in L2.

The offset voltage Vb can be obtained by passing the output voltage Vo through the low-pass filter 40, and the signal after passing through the low-pass filter 40 is excluded from the AC component and becomes only the DC component.
Here, the offset voltage Vb in the case where the coil 32 or the sensor cables L1 and L2 are not disconnected or short-circuited (hereinafter referred to as “normal time”) can be obtained by the following equation (1).

Vb = ((Rc2 + R3) × Vs) / (R1 + Rc2 + R3) (1)
However, Rc2 = (Rc × R2) / (Rc + R2)
Rc2 is a combined resistance of Rc and R2.

Further, the offset voltage Vb when a break occurs in the coil 32 or the sensor cables L1 and L2 (hereinafter referred to as “when disconnected”) can be obtained by the following equation (2).

Vb = ((R2 + R3) × Vs) / (R1 + R2 + R3) (2)

Further, the offset voltage Vb when a short circuit occurs in the coil 32 or the sensor cables L1 and L2 (hereinafter referred to as “at the time of short circuit”) can be obtained by the following expression (3).

Vb = (R3 × Vs) / (R1 + R3) (3)

From the above, the offset voltage Vb has different values depending on whether it is normal, disconnected, or shorted. Therefore, by monitoring the offset voltage Vb, it is possible to detect the occurrence of a disconnection or a short circuit in the coil 32 or the sensor cables L1 and L2.

As an example, when calculating by applying specific numerical values, the offset voltage Vb is as follows.
For example, if Vs = 6 [V], R1 = 4 [kΩ], R2 = 8 [kΩ], R3 = 4 [kΩ], and Rc = 8 [kΩ], 4 [V] is normal and the disconnection is 4.5 [V], 3 [V] at short circuit.
When the coil 32 is short-circuited and Rc does not become 0 [Ω], the offset voltage Vb is less than 4 [V] and 3 [V] or more depending on the resistance value of the coil 32 at that time. Become. Therefore, for example, it is considered that an abnormality has occurred even when the voltage reaches 3.5 [V].

From the above, the offset voltage Vb is monitored by the comparators 42 and 44. For example, if the offset voltage Vb is 3.5 [V] or less, a short detection signal for notifying the occurrence of a short is output, and the offset voltage If Vb is 4.3 [V] or higher, a disconnection detection signal for notifying the occurrence of disconnection may be output. Specifically, the configuration is as follows.
The negative input of the comparator 42 is connected to the output terminal of the low-pass filter 40, and the positive input of the comparator 42 is connected to the power supply line of the reference voltage Vr1 (4.3 [V]). The comparator 42 outputs a high level signal when the offset voltage Vb is lower than the reference voltage Vr1, and outputs a low level signal when the offset voltage Vb is higher than the reference voltage Vr1. Therefore, a high level signal is output in the normal state, but the offset voltage Vb is 4.5 [V] at the time of disconnection, so a low level signal is output as a disconnection detection signal.

  The positive input of the comparator 44 is connected to the output terminal of the low-pass filter 40, and the negative input of the comparator 44 is connected to the power supply line of the reference voltage Vr 2 (3.5 [V]). The comparator 44 outputs a low level signal when the offset voltage Vb is lower than the reference voltage Vr2, and outputs a high level signal when the offset voltage Vb is higher than the reference voltage Vr2. Accordingly, a high level signal is output when normal, but since the offset voltage Vb is 3 [V] during a short circuit, a low level signal is output as a short detection signal.

Even if the resistor R2 is not used, the disconnection or the short circuit can be similarly detected.
Next, the operation of the present embodiment will be described.
In the operation state monitoring device 20, the rotational speed signal is input from the electromagnetic coil type rotational speed sensor via the sensor cables L1 and L2, and the detection signals are input from the vibration sensor and the temperature sensor. The operating condition of the bearing is monitored based on the signal. Specifically, when an abnormality such as a scratch or peeling of the bearing occurs during operation, this is detected.

Further, when a break occurs in the coil 32 or the sensor cables L1 and L2 during operation, the offset voltage Vb becomes 4.5 [V], so a low level signal is output from the comparator 42 as a break detection signal. Is done. Thereby, the driving | running state monitoring apparatus 20 can recognize generation | occurrence | production of a disconnection.
Further, when a short circuit occurs in the coil 32 or the sensor cables L1 and L2 during operation, the offset voltage Vb becomes 3 [V], so that a low level signal is output from the comparator 44 as a short detection signal. . Thereby, the driving | running state monitoring apparatus 20 can recognize generation | occurrence | production of a short circuit.

Thus, in the present embodiment, the power source Vs that applies a DC voltage to the coil 32, the low-pass filter 40 connected to the output terminal of the coil 32, and the output voltage Vb of the low-pass filter 40 are compared with a predetermined voltage. Two comparators 42 and 44 are provided.
Thereby, abnormality of the coil 32 or the sensor cables L1 and L2 can be detected. Further, since the abnormality of the bearing device 14 can be determined in consideration of the presence or absence of abnormality of the coil 32 or the sensor cables L1 and L2, the reliability of abnormality detection such as damage or peeling of the bearing can be improved. That is, it is possible to detect abnormality such as a scratch or peeling of the bearing after distinguishing whether the rotation of the wheel 10 is stopped or whether the coil 32 or the sensor cables L1 and L2 is disconnected or short-circuited. it can.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a diagram showing a second embodiment of the abnormality determination device for the rotational speed sensor and the abnormality determination device for the bearing device according to the present invention.
The present embodiment is different from the first embodiment in the configuration of the electromagnetic coil type rotational speed sensor and the configuration of the circuit for detecting the short detection signal and the disconnection detection signal. Hereinafter, only the parts different from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

Next, the circuit configuration of the operating state monitoring system will be described.
FIG. 5 is a diagram illustrating a circuit configuration of the operating state monitoring system according to the second embodiment.
As shown in FIG. 5, the electromagnetic coil type rotational speed sensor has an annular steel gear 34 that is alternately formed with a concave portion and a convex portion in the circumferential direction, and is fixed to the axle, and in the vicinity of the steel gear 34. The coil 32 is arranged and fixed to the bearing device 14. An iron core 36 is inserted into the coil 32, and a magnet 38 is coupled to one end of the iron core 36.

The operation state monitoring device 20 includes a power source Vs, three resistors R1, R2, and R3 connected in series with the power source Vs in that order, and two comparators 42 that compare the output voltage Ve of the resistor R3 with a predetermined voltage. , 44.
One end of the resistor R2 is connected to one end of the coil 32 via the sensor cable L1, and the other end of the resistor R2 is connected to the other end of the coil 32 via the sensor cable L2. Therefore, the rotation speed signal can be obtained by obtaining the output voltage Vo of the resistor R2.

  The voltage Ve is determined by the resistors R1, R2, R3, and Rc, and changes depending on the current of the DC component flowing through the coil 32. Therefore, by detecting this change in current, the coil 32 or the sensor cables L1 and L2 are disconnected or short-circuited. Can be detected. Note that the voltage Ve is different from the Vo signal in the first embodiment (FIG. 3) and the Vo signal in the second embodiment, and a speed signal component having a frequency proportional to the rotational speed induced from the coil is superimposed. Not. That is, the voltage Ve is basically a signal having only a direct current component having no alternating current component.

Here, the normal voltage Ve can be obtained by the following equation (4).

Ve = (R3 × Vs) / (R1 + Rc2 + R3) (4)
However, Rc2 = (Rc × R2) / (Rc + R2)
Rc2 is a combined resistance of Rc and R2.
It is.

Moreover, the voltage Ve at the time of a disconnection can be calculated | required by the following Formula (5).

Ve = (R3 × Vs) / (R1 + R2 + R3) (5)

Moreover, the voltage Ve at the time of a short circuit can be calculated | required by the following Formula (6).

Ve = (R3 × Vs) / (R1 + R3) (6)

From the above, the voltage Ve has different values depending on whether it is normal, disconnected, or shorted. Therefore, by monitoring the voltage Ve, it is possible to detect that a disconnection or a short circuit has occurred in the coil 32 or the sensor cables L1 and L2.

As an example, when calculating by applying specific numerical values, the voltage Ve is as follows.
For example, if Vs = 6 [V], R1 = 4 [kΩ], R2 = 8 [kΩ], R3 = 4 [kΩ], Rc = 8 [kΩ], 2 [V] at normal condition and at disconnection 1.5 [V], 3 [V] at short circuit.
When the coil 32 is short-circuited and Rc does not become 0 [Ω], the voltage Ve exceeds 2 [V] and is 3 [V] or less depending on the resistance value of the coil 32 at that time. . Therefore, for example, it is considered that an abnormality has occurred even when the voltage reaches 2.7 [V].

From the above, the voltage Ve is monitored by the comparators 42 and 44. For example, if the voltage Ve is 2.5 [V] or more, a short detection signal for notifying the occurrence of a short is output, and the voltage Ve is 1. If it is less than 7 [V], a disconnection detection signal for notifying the occurrence of disconnection may be output. Specifically, the configuration is as follows.
One end of the resistor R3 is connected to the minus input of the comparator 42, and the power supply line of the reference voltage Vr1 (2.5 [V]) is connected to the plus input of the comparator 42. The comparator 42 outputs a high level signal when the voltage Ve is lower than the reference voltage Vr1, and outputs a low level signal when the voltage Ve is higher than the reference voltage Vr1. Accordingly, a high level signal is output in the normal state, but since the voltage Ve is 3 [V] in the short state, a low level signal is output as the short detection signal.

  One end of the resistor R3 is connected to the plus input of the comparator 44, and the power source line of the reference voltage Vr2 (1.7 [V]) is connected to the minus input of the comparator 44. The comparator 44 outputs a low level signal when the voltage Ve is lower than the reference voltage Vr2, and outputs a high level signal when the voltage Ve is higher than the reference voltage Vr2. Accordingly, a high level signal is output in the normal state, but since the voltage Ve is 1.5 [V] at the time of disconnection, a low level signal is output as a disconnection detection signal.

Even if the resistor R2 is not used, the disconnection or the short circuit can be similarly detected.
Next, the operation of the present embodiment will be described.
In the operation state monitoring device 20, when the disconnection occurs in the coil 32 or the sensor cables L1 and L2 during the operation, the voltage Ve becomes 1.5 [V], and therefore the low level signal is disconnected from the comparator 44. It is output as a detection signal. Thereby, the driving | running state monitoring apparatus 20 can recognize generation | occurrence | production of a disconnection.

Further, when a short circuit occurs in the coil 32 or the sensor cables L1 and L2 during operation, the voltage Ve becomes 3 [V], so that a low level signal is output from the comparator 42 as a short detection signal. Thereby, the driving | running state monitoring apparatus 20 can recognize generation | occurrence | production of a short circuit.
Thus, in the present embodiment, the power source Vs for applying a DC voltage to the coil 32, the resistor R2 connected in parallel with the coil 32, the resistor R3 connected in series on the low voltage side of the resistor R2, and the resistor Two comparators 42 and 44 for comparing the output voltage Ve of R3 with a predetermined voltage are provided.

As a result, the same effects as those of the first embodiment can be obtained, and the voltage Ve is different from the Ve of the first embodiment as described above as compared to the first embodiment. Since the speed signal component having a frequency proportional to the rotational speed is not superimposed, the low-pass filter 40 is not required, the circuit configuration is simplified, and the cost can be reduced.
In the first embodiment, the rotational speed sensor is configured using the permanent magnet 30. However, the present invention is not limited to this, and the rotation is performed using the steel gear 34 as in the second embodiment. A speed sensor can also be constructed.

Moreover, in the said 2nd Embodiment, although the rotational speed sensor was comprised using the steel gears 34, not only this but rotation using the permanent magnet 30 like the said 1st Embodiment. A speed sensor can also be constructed.
In the first and second embodiments, the vibration sensor and the temperature sensor are provided. However, only one of them is provided to detect an abnormality such as a scratch or peeling of the bearing. You can also.

  In the above-described embodiment, the abnormality determination device for the rotational speed sensor and the abnormality determination device for the bearing device according to the present invention are applied to the case where the operation state of the bearing in the railway vehicle 100 is monitored. The present invention can be applied to other cases without departing from the gist of the present invention.

It is a block diagram which shows the structure of a driving | running state monitoring system. The structure of one vehicle of the vehicle is shown. It is a figure which shows the circuit structure of the driving | running state monitoring system of 1st Embodiment. It is a graph which shows the change of the output voltage Vo. It is a figure which shows the circuit structure of the driving | running state monitoring system of 2nd Embodiment. It is a figure which shows the attachment structure of the sensor for bearings of patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Rail vehicle 10 Wheel 12 Bearing sensor 14 Bearing apparatus 20 Operating condition monitoring apparatus 30 Permanent magnet 32 Coil 34 Steel gear 36 Iron core 38 Magnet 40 Low-pass filter 42, 44 Comparator L1, L2 Sensor cable

Claims (3)

An abnormality determination device for determining an abnormality related to an electromagnetic coil type rotational speed sensor that outputs a rotational speed signal having a frequency proportional to the rotational speed of a rotating body,
An abnormality determination means for applying a DC voltage to the electromagnetic coil and detecting a change in current of a DC component flowing through the coil to determine whether there is an abnormality in the electromagnetic coil rotational speed sensor or the wiring to the coil. An abnormality determination device for a rotation speed sensor, comprising: Based on the detection result of the electromagnetic coil type rotational speed sensor that outputs a rotational speed signal having a frequency proportional to the rotational speed of the shaft supported by the bearing device and the vibration sensor that detects the vibration of the bearing device, the abnormality of the bearing device is detected. An abnormality determination device for a bearing device for determining,
An abnormality determination means for applying a DC voltage to the electromagnetic coil and detecting a change in current of a DC component flowing through the coil to determine whether there is an abnormality in the electromagnetic coil rotational speed sensor or the wiring to the coil. An abnormality determination device for a bearing device, comprising: In claim 2,
The bearing device abnormality determination device, wherein the bearing device is a bearing device of a railway vehicle or an automobile.

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