JPH06235757A - Method and device for predicting necessary maintenance/ inspection of electric motor bearing - Google Patents

Abstract

PURPOSE:To perform maintenance inspection at a proper timing by predicting the maintenance/inspection period of the bearing of a main electric motor which is mounted to a vehicle and further creating the maintenance/inspection schedule based on a prediction timing. CONSTITUTION:The device is provided with a means 2 for recording usage status of each vehicle mounting a main electric motor 10, a means 3 for judging the abnormality of a bearing according to the measurement temperature of the bearing of the main electric motor 10, a means 4 for inputting the status of the bearing which is obtained after the abnormality of the bearing is judged, a means 5 for creating a status pattern for inputting input bearing status and the usage status of each vehicle which is recorded by the means 2 for recording status, showing the transition of the usage status of vehicle until the bearing malfunctions, and at the same time judging whether the maintenance/inspection of the bearing are required according to the transition of the usage status, and a means 6 for creating the schedule of maintenance/inspection of the main electric motor 10 by comparing the status pattern with the transition of the usage status of each vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor bearing maintenance / inspection forecasting method and device for forecasting the maintenance / inspection timing of a bearing of an electric motor mounted on each bogie of a train, for example.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing the structure of a traveling device installed on the bottom of a train car (hereinafter referred to as a car). In the figure, 7 is a dolly, and 8 is a wheel for running the dolly 7 on a track (not shown). Reference numeral 9 denotes an axle having wheels 8 fixed to the left and right of the axle, and is rotatably attached to a bearing (not shown) of the carriage 7. Reference numeral 10 denotes a main electric motor mounted on the front and rear of the carriage 7. The main electric motor 10 has a gear 12 coupled to a rotary shaft 10a via a joint 11.
Reference numeral 13 is a gear coupled to the axle 9, and the gear 13 is rotated by a gear 12 coupled to a rotating shaft 10a to transmit the rotation of the main electric motor 10 to the wheels 8.

FIG. 7 is a sectional view showing the structure of the main part of the main motor 10 mounted on the carriage 7 (FIG. 6). In the figure,
Reference numeral 10a denotes a rotary shaft, and a rotor 10b formed of, for example, a rotor winding is provided around the rotary shaft 10a. Reference numeral 10c is a sliding bearing that rotatably receives the rotating shaft 10a, 10d is a ball bearing that also rotatably receives the rotating shaft 10a at the other end, 10e is a bearing bracket that supports the sliding bearing 10c, and 10f is a bearing that supports the ball bearing 10d. It is a bracket and each bearing bracket 10e, 10f
Is a stator work 10 that constitutes the frame of the main motor 10.
It is attached to each end face of h. 10g is a stator around which the stator winding 10i is wound, and this stator 10g is provided on the inner peripheral surface of the stator work 10h.

Next, the main motor 1 constructed as described above.
The maintenance / inspection method for the bearing No. 0 will be described with reference to the flowchart in FIG. Since each bearing 10c, 10d has a role of supporting the rotating portion of the main electric motor 10, its maintenance and inspection are very important for the maintenance of the main electric motor 10. for that reason,
Not only when abnormal noise is generated from the main motor 10 due to bearing abnormality (burning due to lack of lubricating oil), the main motor 10 is removed from the carriage 7 according to the flowchart of FIG. Disassembled each bearing 10
Perform regular inspections of c and 10d.

As the maintenance / inspection procedure, the dolly 7 is removed from the vehicle body (not shown) (P1) and the dolly is in a single state (P2). Next, the main motor 1 mounted on the carriage 7
After removing the gear 12 coupled via the joint 11 attached to the rotary shaft 10a of No. 0 (P3), the main motor 10 is removed from the carriage 7 (P4). Then, the joint 11 is removed from the main electric motor 10 (P5) to bring the main electric motor into a single state (P6).

When the main motor 10 is completely removed from the carriage 7, the bearing brackets 10e and 10f are removed from the stator work 10h, and the rotor 10b and the stator 10 are removed.
(P7), and after removing the bearing brackets 10e and 10f from the divided rotor 10b,
The ball bearing 10d and the slide bearing 10c are removed from the bearing brackets 10e and 10f (P8).

After the bearings 10c and 10d are removed and disassembled, they are washed and visually inspected for friction, secular change, burnout, wear and scratches on the bearing transfer surface due to contamination of lubricating oil (P9, P10). At this time, if any abnormality is detected, the bearing is replaced. If no abnormality is detected, the main motor 10 is replenished after replenishing the lubricating oil.
Is assembled and attached to the carriage 7.

[0008]

As described above, the conventional maintenance and inspection of the main motor bearing is performed by periodically removing the main motor from the trolley and disassembling the main motor in order to detect the abnormality of the bearing at an early stage. However, in actuality, depending on the usage status of the traction motor associated with the operation of the vehicle, it may become unnecessary to perform maintenance and inspection work after the traction motor is disassembled after it is determined that there is no abnormality in the bearing. However, considering the effect of bearing abnormalities on the main motor itself, periodic inspections for early detection of bearing abnormalities are indispensable, and the labor burden on workers becomes constant. It was

The present invention has been made to solve the above problems, and an object thereof is to obtain a maintenance / inspection forecasting method for a motor bearing capable of forecasting the date when maintenance / inspection of the bearing is required. In addition, it is an object of the present invention to provide a maintenance / inspection forecasting device for a motor bearing that implements this method.

[0010]

According to another aspect of the present invention, there is provided a method for predicting maintenance / inspection of a motor bearing, wherein the temperature of the bearing of each motor is recorded together with the transition of the usage status of the motor, and the temperature of the bearing is abnormal. When a value is displayed, it shows the transition of the usage status of the electric motor until the bearing shows an abnormal value, and creates a status pattern that determines whether maintenance or inspection of the bearing is required based on the usage status transition. Then, this status pattern and the transition of the usage status of each electric motor are collated to create a maintenance / inspection schedule for each electric motor.

Maintenance of the motor bearing according to the invention of claim 2
The inspection / prediction device has a temperature measuring unit that measures the temperature of the bearing of each electric motor, a status recording unit that sequentially records the usage status of each electric motor, and an abnormality that determines the abnormality of the bearing based on the temperature measured by the temperature measuring unit. Judgment means, status input means for inputting the status of the bearing obtained after the abnormality of the bearing is judged by the abnormality judgment means, bearing status input by the status input means and recorded by the status recording means The usage status of the motor in which the bearing has been installed is input, and the transition of the usage status of the motor until the occurrence of an abnormality in the bearing is indicated, and maintenance / inspection of the bearing is required from the usage status transition. Pattern creating means for creating a status pattern for determining whether or not the status pattern is created and the transition of the usage status of each electric motor are collated to maintain each electric motor. - are those that includes a calendar creating means for creating the inspection timetable.

[0012]

According to the method for predicting maintenance / inspection of an electric motor bearing according to the present invention, each electric motor is checked by comparing the pattern of the electric motor usage condition and the transition of the electric motor usage condition until the abnormality of the electric motor bearing occurs. By deciding at what time (date) to send for maintenance / inspection, each motor can be maintained / inspected at an appropriate time.

According to another aspect of the present invention, there is provided a motor bearing maintenance / inspection forecasting device, which indicates a transition of the usage state of the motor until the bearing shows an abnormal value, and the maintenance / inspection of the bearing is performed based on the transition of the usage state. A status pattern for determining whether or not it is necessary is created, and the status pattern is compared with the transition of the usage status of each electric motor to create a maintenance / inspection schedule for each electric motor.

[0014]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing the configuration of a motor bearing maintenance / inspection forecasting apparatus according to the present embodiment. In the figure, the same reference numerals as those in FIG. 7 indicate the same or corresponding parts. In the figure, 14
A is a temperature measuring element such as a thermistor embedded in the bearing bracket 10e.
The measurement signal corresponding to the temperature rise of the slide bearing 10c is output. Reference numeral 14B is a temperature measuring element such as a thermistor which is also embedded in the bearing bracket 10f, and this temperature measuring element 14B outputs a measurement signal corresponding to the rising temperature of the ball bearing 10d.

Reference numeral 15 is a bearing for each of the bearings 10c and 10d by taking in the measurement signals output from the temperature measuring elements 14A and 14B.
A temperature measuring circuit for measuring the temperature of the temperature, converting the measured temperature into a digital signal after linearizing, and the like, 16 is a temperature measuring circuit 1
5 is a computer which inspects the measured temperature input from 5 and causes the display device 17 to display a maintenance inspection notice together with temperature data indicating an abnormal value when the measured temperature indicates an abnormal value.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. First, the bearing brackets 10e, 10 of the main motor 10 mounted on each vehicle in the same train set.
The vehicle is operated with the temperature measuring elements 14A and 14B embedded in f (step S300). Computer 16
Measures the bearing temperature of all the main electric motors 10 by inputting the measurement signals output from the temperature measuring elements 14A and 14B momentarily through the temperature measuring circuit 15, and stores the measured bearing temperature in a storage unit (not shown) as temperature data. Then, the data file (A) F1 is created (step S301).

Further, the computer 16 reads the temperature data stored from the data file (A) F1 while the vehicle is in operation, and the temperature data and the preset limit value (allowable temperature value) of the bearing temperature are read. In comparison, if the temperature data is less than or equal to the limit value (step S302), the temperature change per unit time of the highest temperature data among the temperature data read from the data file (A) F1 at every predetermined time. The rate is calculated, and it is determined whether the rate of temperature change is equal to or lower than the reference value (step S303).

If it is determined that the rate of temperature change is less than or equal to the reference value, the difference between the highest temperature data and the average value of all the temperature data read from the data file (A) F1 at that time is calculated. It is calculated and it is determined whether or not the temperature difference is less than or equal to a preset margin temperature (step S304). Here, if it is determined that the temperature is equal to or lower than the margin temperature, it is determined whether or not the operation of the vehicle is completed (step S305), and if the vehicle is in operation, the process returns to step S301 again and the temperature of each bearing 10c, 10d. While performing the measurement, step S
The processes of 302 to S304 are repeated, and each bearing 10c, 10
The abnormal temperature rise of d is monitored.

Further, if the computer 16 determines that the operation of the vehicle has ended, the operation state data continuously recorded during operation of the vehicle, for example, date of operation, operation NO, operation pattern, weather condition during operation, boarding The temperature data stored in the data file (A) F1 is stored in the storage unit for each main electric motor 10 together with the rate, the vehicle formation, and the temperature measurement portion to create the data file (B) F2 (step S306).
The temperature monitoring of each bearing 10c, 10d ends.

However, in the process of monitoring the abnormal temperature in steps S302 to S304, if it is determined that the temperature of the ball bearing 10d is equal to or higher than the limit value, the computer 16 displays the temperature data of the ball bearing 10d on the display device 17. In addition to displaying the message, a message for notifying maintenance / inspection of the ball bearing 10d is displayed on the display device 17 (step S3).
07, S308). At this time, the computer 16 can check the operation schedule of other trains and pull the vehicle to the nearest platform for inspection, or the measured temperature data can be used for maintenance and inspection of the main motor 10. It is determined whether or not the temperature is about to be turned (step S3).
09).

If it is determined that the temperature data can stop the operation of the vehicle or require maintenance / inspection, the operation of the vehicle is stopped and sent to the inspection work, and the procedure shown in the flowchart of FIG. 8 is executed. Then, the ball bearing 10d is maintained and inspected (steps S310 and S311). At this time, the situation data when the ball bearing 10d is disassembled, for example, the deterioration state of grease as a lubricant and the situation of the bearing are stored in the storage unit to create a data file (C) F3. If it is determined that the maintenance / inspection is not performed in step S309, based on the operation state of the vehicle, for example, if the vehicle is in operation, the process returns to step S301, and the bearings 10c and 10c are returned again.
The temperature monitoring of d is continued.

Alternatively, if it is determined that the operation of the vehicle has ended, the operation state data of the vehicle recorded during the operation of the vehicle, such as the date of operation, the operation NO, the operation pattern, the weather condition during operation, the boarding rate The temperature data stored in the data file (A) F1 is stored in the storage unit for each main electric motor 10 together with the vehicle formation and the temperature measurement part to create the data file (B) F2 (step S306), and the temperature is monitored. finish.

The above explanation applies to each bearing 10 during operation of the vehicle.
When the abnormal temperature of c, 10d is detected, the bearings 10c, 10
Noticed the maintenance and inspection of d. However, even if an abnormal temperature of each bearing 10c, 10d is detected during operation of the vehicle, it is difficult to stop the operation of the vehicle and send the vehicle to the maintenance / inspection work of each bearing 10c, 10d. Therefore, if the date and time when maintenance / inspection of each bearing 10c, 10d is required will be predicted in advance from the operating condition of the vehicle and the train will be sent to maintenance / inspection work according to the date / time, the train operation schedule will be disturbed. Even if an abnormality is about to occur in the bearings 10c and 10d, it will not proceed any further.

Next, How to create a situation pattern that determines when a vehicle needs to be sent for maintenance and inspection, and how to create a bearing maintenance / inspection schedule that is a factor in determining the train operation schedule Will be explained by the operation of the computer 16. The functional configuration of the computer 16 that implements such operations is as shown in the block diagram of FIG.

In the figure, 1 is each bearing 10 of the electric motor 10.
c, 10d are temperature measuring means for measuring the temperature, 2 is a status recording means for sequentially recording the operating status of a vehicle (not shown) equipped with the electric motor 10, and 3 is a bearing 10c based on the measured temperature measured by the temperature measuring means 1. The abnormality determining means 4 for determining the abnormality of 10d is used for the bearing 10 by the abnormality determining means 3.
Bearing 10 obtained after the abnormality of c and 10d is determined
The status input means 5 for inputting the statuses of c and 10d inputs the bearing status input from the status input means 4 and the operation status of the vehicle recorded by the status recording means 2, and the bearing 10
c, 10d shows the transition of the operation status of the vehicle until the abnormality occurs, and the bearing 10c,
10d is a pattern creating means for creating a situation pattern for determining whether maintenance or inspection is required, 6 is a maintenance / inspection of an electric motor mounted on the vehicle by collating the created situation pattern with the transition of the operation status of the vehicle It is a means for creating a schedule for creating a schedule.

First, a method of creating a situation pattern for judging in what kind of operation situation the vehicle needs to be sent for maintenance and inspection from each operation situation of the vehicle will be described with reference to the flowchart of FIG. First, the temperature measuring elements 14A, 1 are attached to the bearing brackets 10e, 10f of the main motor 10, respectively.
4B is embedded (step S400). Then, the temperature of each of the bearings 10c and 10d is measured by the temperature measuring elements 14A and 14B and stored in the data file (A) F1 (see the flowchart of FIG. 3), and the main motor 10 having the bearing to be monitored is stored. The operating status of vehicles equipped with
The bearing temperature etc. is read from the data file (B) F2 (see the flowchart of FIG. 3) and the data file (D) F is read.
4 (step S401).

Further, the bearing 10c to be monitored is
The state data of the bearings 10c and 10d when the 10d is disassembled is read from the data file (C) F3 (see the flowchart of FIG. 3), stored in the storage unit, and stored in the data file (D) F4 (step S403). Next, the operation status of the vehicle stored in the data file (D) F4,
The correlation between the bearing temperature and the situation when the bearing is disassembled is obtained (step S404).

Once the correlation has been obtained, the bearings 10c, 10 can be used to determine the operating conditions based on this correlation.
In the pattern file (P), a status pattern indicating whether or not an abnormality occurs in d, and whether or not the bearings 10c and 10d need to be sent to maintenance / inspection in the transition of the operation status up to now is stored in the storage unit. ) Create F5 (step S4)
04).

Next, a method for creating a maintenance / inspection schedule of the main motor 10 will be described with reference to the flowchart of FIG. When creating the maintenance / inspection schedule, the operation status and the bearing temperature, which are the data during the operation of the vehicle, are input from the data file (B) F2 (step S500). And the data and the pattern file (P) F while the vehicle is in operation
The maintenance / inspection timing of the bearing is predicted for each main motor 10 mounted on each vehicle by collating with the situation pattern input from step 5 (step S501).

This predicted maintenance / inspection time is displayed for each main motor 10 as a table and displayed on the display device 17 (step S
502) Further, a specific maintenance / inspection schedule is created for each main motor 10 (step S503). If the maintenance / inspection timing is corrected, the maintenance / inspection schedule is created after the correction and the corrected maintenance / inspection timing is displayed (steps S504, S503, S502). Since the series of processes described above are continuously performed while the vehicle is in operation, the process is completed when the operation of the vehicle is completed.

Example 2. In the first embodiment, the temperature measuring elements 14A and 14B are embedded in the bearings 10c and 10d of the main electric motor 10. However, the gears are installed on the carriage 7 to connect the rotary shaft 10a of the main electric motor 10 and transmit the rotation to the axle. By embedding a temperature measurement element in a box (not shown) and having the computer 16 monitor the measurement signal, proper vehicle maintenance and
It becomes possible to forecast the inspection time.

Example 3. Further, by embedding a temperature measuring element in the axle (not shown) of the bogie 7 that rotatably receives the axle 9, and by making the computer 16 monitor the measurement signal, it is possible to predict an appropriate vehicle maintenance / inspection time. Becomes

[0033]

According to the invention of claim 1, the temperature of the bearing of each electric motor is recorded together with the transition of the use condition of each electric motor, and when the temperature of the bearing shows an abnormal value, the bearing has an abnormal value. In addition to showing the transition of the usage status of the electric motor up to, the status pattern is created to judge whether maintenance or inspection of the bearing is required based on the usage status transition. The maintenance / inspection schedule for each of the above-mentioned electric motors is created by collating with the transition of the above, so that it becomes possible to carry out the maintenance / inspection of each motor bearing at an appropriate time. It is effective in providing a highly reliable maintenance / inspection forecasting method for motor bearings that is not overlooked.

According to the second aspect of the present invention, temperature measuring means for measuring the temperature of the bearing of each electric motor, status recording means for sequentially recording the use status of each electric motor, and measurement made by the temperature measuring means. An abnormality determining means for determining an abnormality of the bearing based on a temperature, a status input means for inputting the status of the bearing obtained after the abnormality determination means determines the abnormality of the bearing, and an input by the status input means. The bearing status and the usage status of the electric motor mounted with the bearing recorded by the status recording means are input to indicate the transition of the usage status of the electric motor until the occurrence of an abnormality in the bearing and the usage status. Pattern creation means for creating a status pattern that determines whether maintenance or inspection of the bearing is required based on the transition of the status, and the created status pattern and usage status of each electric motor. It is equipped with a schedule creation means for collating transitions and creating a maintenance / inspection schedule for each of the above-mentioned motors.By referring to the maintenance / inspection schedule, maintenance / inspection of each motor bearing can be performed at an appropriate time. In addition to being able to carry out, there is an effect that the operating schedule of each electric motor can be set up very efficiently.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing the configuration of an embodiment of a maintenance / inspection forecasting device for a motor bearing according to the present invention.

FIG. 2 is a block diagram showing a functional configuration of a computer according to the present embodiment.

FIG. 3 is a flowchart illustrating a maintenance / inspection forecast processing operation of the motor bearing according to the present embodiment.

FIG. 4 is a flow chart for explaining a processing operation of creating a situation pattern indicating the necessity of maintenance / inspection of the bearing according to the present embodiment.

FIG. 5 is a flow chart for explaining a bearing maintenance / inspection schedule data creation processing operation according to the present embodiment.

FIG. 6 is a configuration diagram showing a configuration of a bogie of a vehicle.

FIG. 7 is a cross-sectional view showing a configuration of a main part of a conventional main motor.

FIG. 8 is a flow chart showing a conventional maintenance / inspection procedure for a bearing of a main motor.

[Explanation of symbols]

 1 Temperature Measuring Means 2 Situation Storage Means 3 Abnormality Judging Means 4 Situation Input Means 5 Pattern Making Means 6 Schedule Making Means 7 Bogies 10 Main Motors 10c Sliding Bearings 10d Ball Bearings

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[Procedure amendment]

[Submission date] October 22, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

FIG. 7 is a sectional view showing the structure of the main part of the main motor 10 mounted on the carriage 7 (FIG. 6). In the figure,
Reference numeral 10a denotes a rotary shaft, and a rotor 10b formed of, for example, a rotor winding is provided around the rotary shaft 10a. 10c is a cylindrical roller bearing that rotatably receives the rotating shaft 10a, 10d is a ball bearing that also rotatably receives the rotating shaft 10a at the other end, 10e is a bearing bracket that supports the cylindrical roller bearing 10c, and 10f is a ball bearing. A bearing bracket that supports the bearing 10d, and each bearing bracket 10e, 1
0f is attached to each end surface of the stator work 10h that constitutes the frame of the main electric motor 10. 10 g
Is a stator around which the stator winding 10i is wound, and this stator 10g is provided on the inner peripheral surface of the stator work 10h.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

[0014]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing the configuration of a motor bearing maintenance / inspection forecasting apparatus according to the present embodiment. In the figure, the same reference numerals as those in FIG. 7 indicate the same or corresponding parts. In the figure, 14
A is a temperature measuring element such as a thermistor embedded in the bearing bracket 10e.
Outputs a measurement signal corresponding to the temperature rise of the cylindrical roller bearing 10c. Reference numeral 14B is a temperature measuring element such as a thermistor which is also embedded in the bearing bracket 10f, and this temperature measuring element 14B outputs a measurement signal according to the rising temperature of the ball bearing 10d.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

Further, the computer 16 reads the temperature data stored from the data file (A) F1 while the vehicle is in operation, and the temperature data and the preset limit value (allowable temperature value) of the bearing temperature are read. If the temperature data is within the limit value by comparison (step S302), the temperature change per unit time of the highest temperature data among the temperature data read from the data file (A) F1 at predetermined time intervals. The rate is calculated, and it is determined whether the rate of temperature change is within the reference value (step S303).

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

If it is determined that the temperature change rate is within the reference value, the difference between the highest temperature data and the average value of all the temperature data read from the data file (A) F1 at that time is calculated. Calculated temperature difference and preset margin temperature
It is determined whether or not it is within (step S304). Here, if it is determined that the temperature is within the margin temperature, it is determined whether or not the operation of the vehicle is completed (step S305), and if the vehicle is in operation, the process returns to step S301 again and the temperature of each bearing 10c, 10d. While performing the measurement, step S
The processes of 302 to S304 are repeated, and each bearing 10c, 10
The abnormal temperature rise of d is monitored.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of Codes] 1 Temperature Measuring Means 2 Situation Storage Means 3 Abnormality Judgment Means 4 Situation Input Means 5 Pattern Making Means 6 Date Making Means 7 Bogie 10 Main Motor 10c Cylindrical Roller Bearings 10d Ball Bearings

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

Claims (2)

[Claims] 1. The temperature of the bearing of each electric motor is recorded together with the transition of the usage status of each electric motor, and when the temperature of the bearing shows an abnormal value, the temperature of the electric motor of the motor is increased until the bearing shows the abnormal value. In addition to showing the transition of the usage status, create a status pattern that determines whether maintenance / inspection of the bearing is required based on this usage status transition, and compare this status pattern with the usage status transition of each motor. A maintenance / inspection forecasting method for a bearing of an electric motor, characterized in that a maintenance / inspection schedule is created for each of the above-mentioned electric motors. 2. A temperature measuring means for measuring a temperature of a bearing of each electric motor, a situation recording means for sequentially recording a use situation of each electric motor, and an abnormality for judging an abnormality of the bearing from a temperature measured by the temperature measuring means. Determination means, status input means for inputting the status of the bearing obtained after the abnormality of the bearing is judged by the abnormality judgment means, bearing status input from the status input means and recorded by the status recording means The usage status of the motor in which the bearing has been installed is input, and the transition of the usage status of the motor until the occurrence of an abnormality in the bearing is indicated, and maintenance / inspection of the bearing is required from the usage status transition. Pattern creating means for creating a situation pattern for determining whether or not the electric motor is checked by comparing the created situation pattern with the transition of the use status of each electric motor. MAINTENANCE prediction means of the motor bearing, characterized in that a schedule table creating means for creating a maintenance and inspection schedule table.