JP5978794B2 - Motor control apparatus, image forming apparatus, failure prediction method, and program - Google Patents

Description

  The present invention relates to a motor control device, an image forming apparatus, a failure prediction method, and a program.

  A method is known in which the life of a DC motor or a load connected to the DC motor is determined from the relationship between the actual rotational speed when the DC motor is rotated at a reference PWM value and the reference rotational speed (for example, Patent Documents). 1).

  In the method according to Patent Document 1, the actual rotational speed is measured after the motor starts rotating based on the reference PWM value and then reaches the constant speed rotational state through the acceleration state, and the actual rotational speed and the reference rotational speed are calculated. The life of the motor is judged from the relationship. Therefore, there has been a problem that it takes a certain time from the start of rotation of the motor until it reaches the constant speed rotation state until the life of the motor and the load connected to the motor is determined by this method.

  The present invention has been made in view of the above, and an object thereof is to provide a motor control device capable of predicting a failure of a motor or a load connected to the motor in a short time.

According to an aspect of the present invention, there is provided a motor control device that controls driving of a motor that drives a load, wherein the motor is generated by a generation condition of a driving signal for driving the motor and the driving signal generated by the generation condition Storage means for storing a reference rise time set in advance as a time from the start of driving until reaching the reference rotational speed, and the reference rotation after the motor starts driving based on the drive signal Measurement means for measuring a rise time until the speed is reached, and failure prediction means for performing failure prediction of the motor or the load based on a comparison between the rise time and the reference rise time, and the storage means Each time the motor starts driving based on the driving signal, the rise time measured by the measuring means is stored, and the failure prediction is performed. The means includes: the rise time measured by the measurement means when the motor starts driving based on the drive signal; and the rise time at the previous drive time of the motor stored in the storage means. Based on the comparison, failure prediction of the load is performed .

  According to the embodiment of the present invention, it is possible to provide a motor control device capable of predicting a failure of a motor or a load connected to the motor in a short time.

1 is a diagram illustrating a schematic configuration of an image forming apparatus according to a first embodiment. It is a block diagram which illustrates functional composition of a motor control device concerning a 1st embodiment. It is a figure which illustrates the hardware constitutions of the motor control apparatus which concerns on 1st Embodiment. It is a figure explaining the failure prediction method in the motor control device concerning a 1st embodiment. It is a figure which illustrates the flowchart of the failure prediction process in the motor control apparatus which concerns on 1st Embodiment. It is a block diagram which illustrates functional composition of a motor control device concerning a 2nd embodiment. It is a figure which illustrates the flowchart of the failure prediction process in the motor control apparatus which concerns on 2nd Embodiment. It is a block diagram which illustrates functional composition of a motor control device concerning a 3rd embodiment. It is a figure (1) explaining the remaining life calculation method of the load in the motor control apparatus which concerns on 3rd Embodiment. It is a figure (2) explaining the remaining life calculation method of the load in the motor control apparatus which concerns on 3rd Embodiment. It is a figure which illustrates the flowchart of the failure prediction process in the motor control apparatus which concerns on 3rd Embodiment.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

[First embodiment]
<Configuration of image forming apparatus>
First, a schematic configuration of an image forming apparatus 200 according to the embodiment will be described with reference to FIG.

  The image forming apparatus 200 includes a photosensitive member 10, a charging device 11, an exposure device 12, a developing device 13, an intermediate transfer belt 20, a secondary transfer roller 30, a fixing device 40, an automatic document feeder (ADF) 50, a reading device 51, and the like. Is provided. The image forming apparatus 200 includes a plurality of developing units including a photoconductor 10 that forms toner images of different colors, a charging device 11, an exposure device 12, a developing device 13, and the like, and is a recording medium stored in a paper tray 60. Is a multi-function machine that prints and outputs a color image on paper P.

  In the image forming apparatus 200, when printing an image on the paper P, first, the surface of the photoreceptor 10 on which the charging device 11 rotates is uniformly charged, and the reading device 51 reads a document set on the ADF 50, for example. Based on the image data and the like, the exposure device 12 exposes the surface of the photoreceptor 10 to form an electrostatic latent image. Next, the developing device 13 containing a developer containing toner therein develops the electrostatic latent image on the surface of the photoreceptor 10 to form a toner image. The image forming apparatus 200 includes a plurality of photoreceptors 10, a developing device 13, and the like. After forming toner images of different colors, the toner images are transferred onto the rotating intermediate transfer belt 20 in a superimposed manner.

  The toner image transferred to the intermediate transfer belt 20 is secondarily transferred to the paper P transported from the paper tray 60 by the transport means at the secondary transfer portion between the intermediate transfer belt 20 and the secondary transfer roller 30. The The sheet P onto which the toner image has been transferred is further conveyed, heated and pressed by the fixing device 40 to fix the toner image, and is discharged to the paper discharge tray 70.

  After the toner image is transferred to the intermediate transfer belt 20, the toner remaining on the surface is removed by the cleaning device 14 to prepare for the next image formation.

  The image forming apparatus 200 includes a motor control device 100 described below, and for example, rotationally drives a rotating body such as a paper feed roller and a transport roller for feeding and transporting paper P, or a fixing roller of the photoconductor 10 and the fixing device 40. The motor to be controlled is controlled by the motor control device 100.

<Configuration of motor control device>
Next, the configuration of the motor control device 100 will be described. The motor control device 100 controls driving of the motor and predicts failure of the motor or the conveyance roller of the image forming apparatus 200 connected to the motor, for example.

  FIG. 2 is a block diagram illustrating a functional configuration of the motor control device 100 according to the first embodiment.

  As shown in FIG. 2, the motor control device 100 includes a storage unit 101, a PWM signal generation unit 102, a motor driver 103, a DC motor 104, a load 105, an encoder 106, a rise time measurement unit 107, a failure prediction unit 108, and a display unit. 109.

  The storage unit 101 is a non-volatile memory such as a ROM (Read Only Memory), for example, and stores various data for predicting a failure of the DC motor 104 or the load 105 by a method described later. The storage unit 101 stores “duty ratio”, “reference rotation speed”, “reference rise time”, and the like.

  The “duty ratio” is a generation condition for the PWM signal generation unit 102 to generate a drive signal for the DC motor 104. The PWM signal generation unit 102 generates a PWM signal as a drive signal based on the “duty ratio” stored in the storage unit 101.

  The “reference rotation speed” is a rotation speed of the DC motor 104 that is set in advance. For example, the minimum rotation speed in the specification of the DC motor 104 is set. The rise time measuring unit 107 measures the time from when the DC motor 104 starts rotating until it reaches the “reference rotation speed”, and the failure predicting unit 108 is based on the time measured by the rise time measuring unit 107. Failure prediction of the DC motor 104 or the load 105 is performed.

  The “reference rise time” is a value set in advance as the time from when the DC motor 104 starts rotating until it reaches the reference rotation speed. The “reference rise time” is set to, for example, a rise time at which a failure is approaching the DC motor 104 or the load 105. The failure prediction unit 108 performs failure prediction of the DC motor 104 or the load 105 by comparing the rise time actually measured by the rise time measurement unit 107 with the reference rise time.

  The PWM signal generation unit 102 generates a PWM signal as a drive signal based on the duty ratio stored in the storage unit 101 as a drive signal generation condition.

  The motor driver 103 rotates the DC motor 104 based on the PWM signal generated by the PWM signal generator 102.

  The DC motor 104 is connected to a load 105 such as, for example, a paper feed roller, a conveyance roller, or the photoconductor 10 and rotates the load 105. In the present embodiment, the DC motor 104 is used as an example of a motor, but another motor such as an AC induction motor may be used.

  The encoder 106 is a rotation speed detection means for detecting the rotation speed of the DC motor 104, and for example, a rotary encoder or the like can be used.

  The rise time measuring unit 107 measures the rise time of the DC motor 104. The rise time is the reference rotation in which the rotation speed of the DC motor 104 is stored in the storage unit 101 after the DC motor 104 starts rotating with the PWM signal generated by the duty ratio stored in the storage unit 101. Time to reach speed. The rise time measurement is preferably started simultaneously with the start of input of the PWM signal to the DC motor 104. However, immediately after the start of the rotation of the DC motor 104, if the influence on the measurement of the rise time is very small, for example, the measurement may be started after a lapse of several milliseconds after the PWM signal is input.

  The failure prediction unit 108 performs failure prediction of the DC motor 104 or the load 105 based on the comparison between the rise time measured by the rise time measurement unit 107 and the reference rise time stored in the storage unit 101.

  The display unit 109 is a liquid crystal display, for example, and displays a failure prediction result performed by the failure prediction unit 108.

  FIG. 3 is a diagram illustrating a hardware configuration of the motor control device 100 according to the first embodiment.

  As shown in FIG. 3, the motor control device 100 includes a DC motor 104, a load 105, an encoder 106, a display device 109, a CPU 111, an HDD 112, a ROM 113, a RAM 114, a network I / F unit 115, and a storage medium I / F unit 116. And are connected to each other by a bus B.

  The CPU 111 is an arithmetic device that implements each function of the motor control device 100 by reading a program or data from a storage device such as the HDD 112 or the ROM 113 onto the RAM 114 and executing processing.

  The HDD 112 is a non-volatile storage device that stores programs and data. The stored programs and data include an OS (Operating System) that is basic software for controlling the entire motor control device 100, and application software that provides various functions on the OS.

  The ROM 113 is a nonvolatile semiconductor memory (storage device) that can retain programs and data even when the power is turned off. The RAM 114 is a volatile semiconductor memory (storage device) that temporarily stores programs and data.

  The network I / F unit 115 is connected to other devices connected via a network such as a LAN (Local Area Network) and a WAN (Wide Area Network) constructed by a data transmission path such as a wired and / or wireless line. Interface.

  The recording medium I / F unit 116 is an interface with the recording medium. The motor control device 100 can read and / or write the recording medium 117 via the recording medium I / F unit 116. The recording medium 117 includes a flexible disk, a CD, a DVD (Digital Versatile Disk), an SD memory card, a USB memory (Universal Serial Bus memory), and the like.

<Failure prediction method>
Next, a failure prediction method for the DC motor 104 or the load 105 in the motor control apparatus 100 will be described.

  FIG. 4 shows a PWM signal generated based on a predetermined duty ratio stored in the storage unit 101 by the PWM signal generation unit 102 of the motor control device 100, and a DC motor 104 that rotates when the PWM signal is input. It is an example of the result of having measured the rotational speed with the encoder 106. FIG.

As shown in FIG. 4, the PWM signal generating unit 102 generates a constant PWM signal with a duty ratio stored in the storage unit 101, DC motor 104 to the time inputted PWM signal generated is _{t 0} Start rotating. The DC motor 104 is continuously rotated and accelerated by the PWM signal generated by the PWM signal generation unit 102, and rotates at a constant speed after reaching a certain speed.

  At this time, even when the same PWM signal is input to the DC motor 104, the DC motor 104 starts rotating after the DC motor 104 starts rotating in accordance with a change in the load torque T due to deterioration of the DC motor 104 or the load 105 or the like. The transition of the rotational speed until the speed state is reached and the rotational speed in the constant speed state fluctuate.

  Therefore, for example, the minimum speed in the specification of the DC motor 104 is set as the reference rotation speed, the measurement result of the rise time from when the DC motor 104 starts to rotate with a constant PWM signal until the reference rotation speed is reached, and preset. The failure prediction of the DC motor 104 or the load 105 can be performed by comparing the obtained reference rise time.

  For example, when the measured rise time of the DC motor 104 is longer than the reference rise time, it is considered that the load torque T is increased due to deterioration of the DC motor 104 or the load 105. It can be determined that the failure or failure of the load 104 or the load 105 is close. Further, for example, when a predetermined range is set as the reference rise time and the measured rise time is outside the range of the reference rise time, the load torque T varies similarly due to deterioration of the DC motor 104 or the load 105 or the like. Therefore, it can be determined that the failure or failure of the DC motor 104 or the load 105 is near. The reference rise time can be appropriately set based on the measurement result of the rise time according to the deterioration state of the DC motor 104 or the load 105 or the like.

The example shown in FIG. 4 will be described based on specific numerical values. For example, when the duty ratio stored in the storage unit 101 is set to 50% and the reference rotational speed of the DC motor 104 is set to 1000 rpm, the rising time (t ₁ −t when the load torque T ₁ = 0.05 Nm is set. ₀₎ is 4 ms, the load rise time _(t 2 -t ₀ when the torque _T 2 = 0.1 Nm) is 5 ms, the load torque _T 3 = rise time when the 0.12 nm _(t 3 -t ₀₎ is 12ms Met. As described above, the rise time changes due to the change in the load torque T according to the state of the DC motor 104 or the load 105.

Here, if the reference rise time of the DC motor 104 is set to 10 ms, for example, the rise time at the load torque T ₃ exceeds the reference rise time in the example shown in FIG. It can be determined that the failure or the failure is near. In addition, when a range from 5 ms to 10 ms is set as the reference rise time, for example, the rise time at the load torques T ₁ and T ₃ is outside the range of the reference rise time, so that the failure or failure of the load 105 is near. It can be judged.

  As described above, in the motor control device 100 according to the first embodiment, the failure prediction unit 108 is compared with the reference rise time stored in the storage unit 101 and the rise time measured by the rise time measurement unit 107. Performs failure prediction of the DC motor 104 or the load 105.

  Next, failure prediction processing in the motor control device 100 according to the first embodiment will be described based on the flowchart illustrated in FIG.

  For failure prediction in the motor control device 100, first, in step S1, the PWM signal generation unit 102 generates a PWM signal based on the duty ratio stored in the storage unit 101, and the motor driver 103 is generated in the DC motor 104. Input PWM signal.

  Next, in step S2, the rise time measuring unit 107 starts counting by a timer. In step S3, when the rotational speed of the DC motor 104 detected by the encoder 106 exceeds the predetermined rotational speed stored in the storage unit 101, the rise time measuring unit 107 stops counting by the timer and rises time End the measurement.

  When the rise time is measured by the rise time measuring unit 107, in step S4, the failure prediction unit 108 compares the measured rise time with the reference rise time stored in the storage unit 101.

  If the measured rise time is less than the reference rise time in step S4, the process is terminated. If the measured rise time is greater than or equal to the reference rise time, the display unit 109 loads the load 105 in step S5. It is displayed that the failure is near and the process is terminated.

  Note that a predetermined range is set as the reference rise time to be stored in the storage unit 101, and the failure prediction unit 108 causes the DC motor 104 or the load 105 to fail when the measured rise time is outside the range of the reference rise time. You may judge that it is close.

  As described above, in the motor control device 100 according to the first embodiment, the failure prediction is performed based on the rise time from when the DC motor 104 starts to rotate by the predetermined PWM signal until it reaches the reference rotation speed. The unit 108 performs failure prediction of the DC motor 104 or the load 105. Since the failure prediction is performed based on the rise time until the DC motor 104 reaches a reference rotation speed set lower than the rotation speed in the constant speed rotation state in which the DC motor 104 rotates at a constant speed, a short time is required after the DC motor 104 starts rotating. Thus, it is possible to predict a failure of the DC motor 104 or the load 104.

  Further, according to the image forming apparatus 200 including the motor control device 100, a failure or failure of a rotating body such as a conveyance roller, a paper feed roller, a photoconductor, and a fixing roller as a load whose rotation is controlled by the motor control device 100. It is possible to detect closeness.

[Second Embodiment]
A second embodiment will be described with reference to the drawings. Note that a description of the same components as those of the above-described embodiment will be omitted.

  In the motor control device 100 according to the second embodiment, the storage unit 101 stores the rise time measured by the rise time measurement unit 107. Further, the failure prediction unit 108 predicts a failure of the DC motor 104 or the load 105 based on a comparison between the rise time measured by the rise time measurement unit 107 and the rise time measured last time stored in the storage unit 101. Do.

  FIG. 6 is a block diagram illustrating a functional configuration of the motor control device 100 according to the second embodiment.

  As shown in FIG. 6, in the motor control device 100 according to the second embodiment, the storage unit 101 stores the rise time measurement result measured by the rise time measurement unit 107.

  Next, failure prediction processing in the motor control device 100 according to the second embodiment will be described based on the flowchart illustrated in FIG.

  In the failure prediction in the motor control device 100, first, in step S11, the PWM signal generation unit 102 generates a PWM signal based on the duty ratio stored in the storage unit 101, and the motor driver 103 is generated in the DC motor 104. Input PWM signal.

  Next, in step S12, the rise time measuring unit 107 starts counting by a timer. In step S13, when the rotational speed of the DC motor 104 detected by the encoder 106 exceeds the reference rotational speed stored in the storage unit 101, the rise time measuring unit 107 stops counting by the timer and determines the rise time. End measurement.

  When the rise time is measured by the rise time measuring unit 107, in step S14, the failure prediction unit 108 compares the measured rise time with the reference rise time stored in the storage unit 101.

  If the rise time measured by the rise time measuring unit 107 is less than the reference rise time, the difference between the measured rise time and the previously measured rise time stored in the storage unit 101 is predetermined in step S15. It is determined whether or not it is less than the value of.

  If the rise time measured by the rise time measurement unit 107 is equal to or greater than the reference rise time (S14: No), or if the difference from the rise time measured last time is equal to or greater than a predetermined value (S15: No), step In S16, the display unit 109 displays that the failure of the load 105 is near.

  Finally, in step S17, the rise time measured by the rise time measuring unit 107 is stored in the storage unit 101, and the process is terminated.

  As described above, the motor control device 100 according to the second embodiment performs DC based on the comparison between the rise time measured by the rise time measurement unit 107 and the rise time measured last time stored in the storage unit 101. Failure prediction of the motor 104 or the load 105 is performed. If the rise time has changed significantly from the previous measurement, some abnormality has occurred in the DC motor 104 or the load 105 even if the rise time satisfies the condition in comparison with the reference rise time. It is possible. Therefore, the motor control device 100 can perform the failure prediction of the DC motor 104 or the load 105 in a short time, and compare the rise time measured by the failure prediction unit 108 with the rise time at the previous measurement. Thus, it is possible to detect an abnormality occurring in the DC motor 104 or the load 105 with higher sensitivity.

[Third embodiment]
A third embodiment will be described with reference to the drawings. Note that a description of the same components as those of the above-described embodiment will be omitted.

  In the motor control device 100 according to the third embodiment, the failure prediction unit 108 obtains an approximate curve of the rise time with respect to the operation time of the DC motor 104 or the load 105 from the measurement result of the rise time stored in the storage unit 101. . The failure prediction unit 108 calculates the remaining life of the DC motor 104 or the load 105 by obtaining the time until the rise time reaches the reference rise time stored in the storage unit 101 based on the obtained approximate curve.

  FIG. 8 is a block diagram illustrating a functional configuration of the motor control device 100 according to the third embodiment.

  As illustrated in FIG. 8, the storage unit 101 stores the rise time measurement result by the rise time measurement unit 107 and the reference operating time of the DC motor 104 or the load 105.

  The failure prediction unit 108 calculates the remaining life of the DC motor 104 or the load 105 based on the measurement result of the rise time stored in the storage unit 101 by a method described later. Further, the failure prediction unit 108 performs failure prediction of the DC motor 104 or the load 105 based on the comparison between the rise time measured by the rise time measurement unit 107 and the reference rise time stored in the storage unit 101. Furthermore, the failure prediction of the DC motor 104 or the load 105 may be performed based on a comparison between the rise time measured by the rise time measurement unit 107 and the rise time at the previous measurement stored in the storage unit 101.

<Remaining life calculation method>
Next, a method for calculating the remaining life of the load 105 in the motor control device 100 according to the third embodiment will be described based on the graph shown in FIG. Note that the remaining life of the DC motor 104 can be calculated by a similar method.

  FIG. 9 is a graph showing the measurement result of the rise time measured by the rise time measurement unit 107 stored in the storage unit 101.

  As shown in FIG. 9, the failure prediction unit 108 obtains an approximate curve from the measurement result of the rise time with respect to the operating time of the load 105, and the time when the approximate curve reaches the reference rise time stored in the storage unit 101 and the current time The remaining life of the load 105 is calculated from the operating time. The reference rise time in the third embodiment is a time for determining that the load 105 (or the DC motor 104) has failed, and the reference in the first and second embodiments for determining that the failure is approaching. A value larger than the rise time is set.

Failure prediction unit 108 is measured by the current operating time t _a rise time measurement unit 107 to the load 105, from the rise time measurement result stored in the storage unit 101, for example, obtaining an approximate curve of the primary polynomial. Next, the failure prediction unit 108 obtains a time t _b that reaches the reference rise time stored in the storage unit 101 in the obtained approximate curve, and obtains the remaining life of the load 105 by estimation as _a time (t _b −t _a ). .

  Further, as shown in FIG. 10, the failure prediction unit 108 can obtain an approximate curve as a quadratic polynomial, and similarly can estimate the remaining life of the load 105 by estimation. Further, for example, a plurality of approximate curves such as a first order polynomial and a second order polynomial may be obtained, and the remaining life of the load 105 may be obtained based on an approximate curve having a large determination coefficient.

  The failure prediction process in the motor control device 100 according to the third embodiment will be described based on the flowchart illustrated in FIG.

  In the failure prediction process, first, in step S21, the PWM signal generation unit 102 generates a PWM signal based on the duty ratio stored in the storage unit 101, and the motor driver 103 generates the PWM signal generated in the DC motor 104. input.

  Next, in step S22, the rise time measuring unit 107 starts counting by a timer. In step S23, when the rotational speed of the DC motor 104 detected by the encoder 106 exceeds the reference rotational speed stored in the storage unit 101, the rise time measuring unit 107 stops counting by the timer and determines the rise time. End measurement.

  When the rise time measurement is completed, in step S24, the failure prediction unit 108 calculates an approximate curve of the rise time measurement result, and in step S25, obtains the remaining life of the load 105 based on the calculated approximate curve.

  If the remaining life obtained by the failure predicting unit 108 is shorter than the reference remaining life stored in the storage unit 101 in step S26, the display unit 10 is near to fail in the load 105 in step S27. Is displayed.

  Finally, in step S28, the rise time measured by the rise time measuring unit 107 is stored in the storage unit 101, and the process is terminated.

  As described above, in the motor control device 100 according to the third embodiment, the failure prediction unit 108 calculates an approximate curve of the rise time with respect to the operating time of the load 105 from the measurement result of the rise time by the rise time measurement unit 107. The remaining life of the load 105 is obtained based on the calculated approximate curve. Therefore, the motor control device 100 can perform failure prediction of the load 105 in a short time and obtain the time until the load 105 reaches failure.

  Up to this point, the present invention has been described based on each of the above embodiments. However, the function of the motor control device 100 according to the above embodiments is based on each processing procedure described above according to each of the above embodiments. This can be realized by being executed by a computer as a program coded in a programming language suitable for the motor control device 100. Therefore, the program for realizing the motor control device 100 according to each of the above embodiments can be stored in the computer-readable recording medium 117.

  Therefore, the program according to each of the above embodiments is stored in a recording medium 117 such as a floppy (registered trademark) disk, a CD (Compact Disc), a DVD (Digital Versatile Disk), and the like, and the motor control is performed from these recording media 117. It can be installed on the device 100. In addition, since the motor control device 100 includes the network I / F unit 115, the program according to each of the above embodiments can be downloaded and installed via an electric communication line such as the Internet.

  The motor control device, the image forming apparatus, the failure determination method, and the program according to the embodiments have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made within the scope of the present invention. Is possible.

DESCRIPTION OF SYMBOLS 100 Motor control apparatus 101 Memory | storage part (memory | storage means)
104 DC motor (motor)
105 Load 107 Rise Time Measurement Unit (Measuring Means)
108 Failure prediction unit (failure prediction means)
200 Image forming apparatus

JP 2001-298899 A

Claims (6)

A motor control device that controls driving of a motor that drives a load,
A drive signal generation condition for driving the motor and a reference rise time set in advance as a time from when the motor starts driving to the reference rotation speed by the drive signal generated under the generation condition are stored. Storage means for
Measuring means for measuring a rise time from when the motor starts driving based on the driving signal until the motor reaches the reference rotational speed;
Failure prediction means for performing failure prediction of the motor or the load based on the comparison between the rise time and the reference rise time ,
The storage means stores the rise time measured by the measurement means every time the motor starts driving based on the drive signal,
The failure predicting means includes the rising time measured by the measuring means when the motor starts driving based on the driving signal, and the rising time at the previous driving time of the motor stored in the storage means. A motor control device characterized by predicting a failure of the load based on a comparison with time . The failure prediction means obtains an approximate curve of the rise time stored in the storage means with respect to the operating time of the load, and calculates the remaining life of the load from the time when the reference rise time is reached in the approximate curve. The motor control device according to claim 1 . The motor is a DC motor;
The storage means stores a duty ratio as a generation condition of the drive signal,
The drive signal, the motor control device according to claim 1 or 2, wherein the a PWM signal generated based on the duty ratio stored in the storage means. An image forming apparatus including the motor control device according to any one of claims 1 to 3. A generation condition of a drive signal for driving a motor and a reference rise time set in advance as a time from when the motor starts driving until reaching a reference rotation speed by the drive signal generated under the generation condition are stored. A failure prediction method in a motor control device that controls the driving of the motor that includes a storage unit and drives a load,
A measurement step of measuring a rise time from when the motor starts driving based on the driving signal until the motor reaches the reference rotational speed;
A storage step of storing in the storage means the rise time measured by the measurement step each time the motor starts driving based on the drive signal;
A first failure prediction step for performing failure prediction of the motor or the load based on a comparison between the rise time and the reference rise time ;
Based on a comparison between the rise time measured by the measurement step when the motor starts driving based on the drive signal and the rise time at the previous drive time of the motor stored in the storage means. A failure prediction method comprising: a second failure prediction step that performs failure prediction of the load . A program for causing a computer to execute the failure prediction method according to claim 5 .

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