JP2020048283A - Motor control device and image forming apparatus - Google Patents

Abstract

To provide a motor control device and an image forming apparatus, capable of controlling operation according to characteristics of a motor even if different types of motors are connected.SOLUTION: The motor control device includes: a reception unit 41 for receiving a conversion monitoring signal obtained by converting by a different method for each type of motor a relationship between operating characteristics of a motor 37 and a monitoring signal for monitoring the operating characteristics, output from a monitoring signal output terminal OUT of the motor 37; and a control unit 44 for performing control corresponding to the type of motor identified from the output characteristics of the conversion monitoring signal received by the reception unit 41.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a motor control device and an image forming device.

  Patent Document 1 discloses a drive device for an AC motor including an inverter for converting a DC voltage to AC or DC and supplying the AC voltage to an AC motor, and a control device for controlling the magnitude and frequency of the output voltage of the inverter. Discloses a control device for an AC motor, characterized in that the control device includes a motor type determining means for determining the type of the AC motor connected to the inverter.

  Patent Document 2 discloses an AC motor control device including an inverter for converting a DC voltage Vdc into AC or DC and supplying the AC voltage to an AC motor, and a control device for controlling the magnitude and frequency of the output voltage of the inverter. In the above, two or more types of operation modes including a normal operation mode and an auto-tuning mode are provided, and an operation mode selection unit for selecting one of them, and an inverter operation start unit, and in a state where the auto-tuning mode is selected, By starting operation, the inverter supplies power at an arbitrary frequency to the AC motor, and calculates and calculates the electric constant of the motor and the moment of inertia of the load from the motor current at this time, displays the measured values and stores them in the memory. A control device for an AC motor is disclosed.

  Patent Literature 3 discloses a method of controlling a brushless motor, which includes a step of storing a lookup table including control values of a plurality of speeds, a step of periodically obtaining speed adjustment control values, and a method of controlling a brushless motor. Exciting the phase winding, wherein the speed adjustment control value is used to determine one of the phase and the length of the excitation, and obtaining the speed adjustment control value measures the speed of the brushless motor. Using the measured speed to increase or decrease the speed adjustment variable by a predetermined constant when the measured speed is greater than or less than a threshold value; and A method is disclosed that includes selecting and adjusting a selected control value using a speed adjustment variable to obtain a speed adjustment control value.

JP-A-2002-335699 JP 06-265607 A JP 2013-110961 A

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor control device and an image forming apparatus capable of performing operation control in accordance with the characteristics of a different type of motor even when the motor is connected.

  In order to achieve the above object, a motor control device according to a first aspect is directed to a motor control device that outputs a relationship between an operation characteristic of the motor and a monitor signal that monitors the operation characteristic, which is output from a monitor signal output terminal of the motor. A receiving unit that receives a conversion monitoring signal converted by a different method for each type, and a control unit that performs control corresponding to the type of the motor identified from the output characteristics of the conversion monitoring signal received by the receiving unit. .

  The motor control device according to a second aspect is the motor control device according to the first aspect, wherein the operation characteristic is represented by a rotation speed or a torque of the motor, the monitor signal is represented by a current consumption, and the output characteristic is represented by the output characteristic. This is indicated by the current consumption corresponding to the rotation speed or the torque.

  The motor control device according to a third aspect is the motor control device according to the second aspect, wherein the control unit acquires the current consumption at a predetermined rotation speed or torque of the motor to identify a type of the motor. Is what you do.

  A motor control device according to a fourth aspect is the motor control device according to the third aspect, wherein the output characteristic is approximated by a straight line, and the sign of the slope of the straight line differs between at least two types of the motor.

  The motor control device according to a fifth aspect is the motor control device according to the second aspect, wherein the output characteristic is approximated by a straight line, and the slope of the straight line differs for each type of the motor. And the type of the motor is identified.

  A motor control device according to a sixth aspect is the motor control device according to the fifth aspect, wherein the sign of the inclination of the straight line is the same regardless of the type of the motor.

  In order to achieve the above object, an image forming apparatus according to a seventh aspect includes a motor control device described above, a motor controlled by the motor control device, a rotating body rotated by the motor, and the rotating body. And an image forming unit for forming an image on a recording medium.

  According to the motor control apparatus of the first aspect and the image forming apparatus of the seventh aspect, even when a different type of motor is connected, the motor control apparatus and the image forming apparatus capable of controlling the operation according to the characteristics of the motor It has the effect that a device is provided.

  According to the motor control device of the second aspect, there is an effect that a dedicated monitoring signal is not required as compared with a case where the relationship between the rotation speed or the torque and the current consumption is not used as the output characteristic.

  According to the motor control device of the third aspect, the control unit obtains the inclination of a straight line indicating the relationship between the rotation speed or torque of the motor and the current consumption to identify the type of the motor, Is more easily identified.

  According to the motor control device of the fourth aspect, more motors are identified as compared with the case where the sign of the inclination of the straight line indicating the relationship between the rotation speed or torque of the motor and the current consumption is the same for all motors. Has the effect that

  According to the motor control device of the fifth aspect, the control unit obtains a straight line sign indicating the relationship between the number of rotations or torque of the motor and the current consumption to identify the type of the motor. This has the effect that many motors are identified.

  According to the motor control device of the sixth aspect, the sign of the inclination of the straight line indicating the relationship between the rotation speed or the torque of the motor and the current consumption includes a case where the sign differs depending on the type of the motor. Is more easily performed.

FIG. 1 is a side view illustrating an example of a configuration of an image forming apparatus according to an embodiment. FIG. 2 is a block diagram illustrating an example of a configuration of a motor control device according to the embodiment. 5 is a graph illustrating an example of a torque-current consumption characteristic according to the first embodiment. 5 is a flowchart illustrating a flow of a motor control process according to the first embodiment. 9 is a graph illustrating an example of a torque-current consumption characteristic according to the second embodiment. 9 is a flowchart illustrating a flow of a motor control process according to the second embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

[First Embodiment]
A motor control device and an image forming apparatus according to the present embodiment will be described with reference to FIGS. First, a configuration of an image forming apparatus 10 according to the present embodiment will be described with reference to FIG. In the following, Y represents yellow, M represents magenta, C represents cyan, and K represents black. When it is necessary to distinguish each component and toner image (image) for each color, A description will be given with the symbols (Y, M, C, K) of the colors corresponding to the respective colors added to the end. Further, in the following, in the case where the components and the toner image are collectively referred to without being distinguished for each color, the description will be made with the color symbol at the end of the symbol omitted.

  As shown in FIG. 1, an image processing unit that performs image processing for converting input image data into gradation data of four colors of Y, M, C, and K is provided inside an apparatus main body 10 </ b> A of the image forming apparatus 10. 12 are provided.

  In addition, an image forming unit 16 that forms a toner image of each color is arranged at a center side of the apparatus main body 10A at intervals in a direction inclined with respect to the horizontal direction. A primary transfer unit 18 to which the toner images formed by the image forming units 16 of each color are transferred in a multiplex manner is provided above the image forming units 16 of each color in the vertical direction.

  Further, on the side of the primary transfer unit 18 (on the left side in FIG. 1), a sheet P, which is an example of a recording medium conveyed along a conveyance path 60 by a supply conveyance unit 30 described later, is multiplexed with the primary transfer unit 18. Is provided with a secondary transfer roll 22 for transferring the toner image transferred to the image forming apparatus.

  A fixing device 24 is provided on the downstream side in the transport direction of the paper P with respect to the secondary transfer roll 22 (hereinafter, referred to as “paper transport direction”). Further, the fixing device 24 fixes the toner image transferred on the sheet P to the sheet P by heat and pressure.

  Further, on the downstream side of the fixing device 24 in the sheet conveyance direction, a discharge roll 28 that discharges the paper P on which the toner image is fixed to a discharge portion 26 provided at an upper portion of the apparatus main body 10A of the image forming apparatus 10 is provided. Is provided.

  On the other hand, below and beside the image forming unit 16 in the vertical direction, a supply transport unit 30 that supplies and transports the paper P is provided. Above the primary transfer unit 18 in the vertical direction, a toner cartridge 14 which is detachable from the apparatus main body 10A from the front of the apparatus main body 10A and is filled with the toner to be supplied to the developing device 38 is provided for each color. (14K to 14Y) are arranged side by side in the device width direction. The toner cartridges 14 of the respective colors are formed in a cylindrical shape extending in the depth direction of the apparatus, and are connected to the developing devices 38 of the respective colors via supply tubes (not shown).

  As shown in FIG. 1, the image forming units 16 of the respective colors have the same configuration. The image forming unit 16 includes a rotating cylindrical image holder 34 and a charger 36 for charging the surface of the image holder 34.

  Further, the image forming unit 16 includes an LED (Light Emitting Diode) head 32 for irradiating the charged surface of the image carrier 34 with exposure light. Further, the image forming unit 16 includes a developing device 38 that develops the electrostatic latent image formed by the irradiation of the exposure light from the LED head 32 with a developer and visualizes the electrostatic latent image as a toner image. Further, the image forming unit 16 includes a cleaning blade 56 for cleaning the surface of the image holding member 34.

  A developing roller 39 is arranged in the developing device 38 so as to face the image holding member 34. The developing device 38 uses the developing roller 39 to convert the electrostatic latent image formed on the image holding member 34 with a developer. Develop and visualize as a toner image.

  Then, the charger 36, the LED head 32, the developing roll 39, and the cleaning blade 56 face the surface of the image carrier 34 in this order from the upstream side to the downstream side in the rotation direction of the image carrier 34. Are located.

  The primary transfer unit 18 includes an endless intermediate transfer belt 42, and a drive roll 46 around which the intermediate transfer belt 42 is wound and driven to rotate by a motor (not shown) to rotate the intermediate transfer belt 42 in the direction of arrow A. ing. Further, the primary transfer unit 18 is wound around the intermediate transfer belt 42, and is provided with a tension applying roll 48 for applying tension to the intermediate transfer belt 42, and is disposed vertically above the tension applying roll 48 to be driven by the intermediate transfer belt 42. And an auxiliary roll 50 that rotates. Further, the primary transfer unit 18 includes primary transfer rolls 52 arranged on the opposite sides of the image holders 34 of the respective colors with the intermediate transfer belt 42 interposed therebetween.

  With the above configuration, the toner images of each color of Y, M, C, and K sequentially formed on the image holding member 34 of the image forming unit 16 of each color are transferred onto the intermediate transfer belt 42 by the primary transfer rolls 52 of each color. Transcribed multiple.

  Further, a cleaning blade 56 that contacts the surface of the intermediate transfer belt 42 and cleans the surface of the intermediate transfer belt 42 is arranged on the opposite side of the drive roll 46 with the intermediate transfer belt 42 interposed therebetween.

  Further, on the opposite side of the auxiliary roll 50 with the intermediate transfer belt 42 interposed therebetween, a secondary transfer roll 22 that transfers the toner image transferred on the intermediate transfer belt 42 to the paper P to be conveyed is provided. The secondary transfer roll 22 is grounded, the auxiliary roll 50 forms an opposite electrode of the secondary transfer roll 22, and the secondary transfer voltage is applied to the auxiliary roll 50, so that the paper P Is transferred to the toner image.

  The supply / conveyance unit 30 is provided below the image forming unit 16 in the apparatus main body 10A in the vertical direction, and includes a paper supply member 62 on which a plurality of papers P are stacked.

  Further, the supply / conveyance unit 30 includes a paper feed roll 64 that feeds the paper P stacked on the paper feed member 62 to the transport path 60, and a separation roll 66 that separates the paper P sent by the paper feed roll 64 one by one. And a positioning roll 68 for adjusting the transport timing of the paper P. Each roll is arranged in this order from the upstream side to the downstream side in the sheet transport direction.

  With the above configuration, the paper P supplied from the paper supply member 62 is moved to the contact portion (secondary transfer position) between the intermediate transfer belt 42 and the secondary transfer roll 22 by the rotating positioning roll 68 at a timing determined. Will be sent out.

  First, gradation data of each color is sequentially output from the image processing unit 12 to the LED head 32 of each color. Then, the exposure light emitted from the LED head 32 in accordance with the gradation data is applied to the surface of the image carrier 34 charged by the charger 36. Thus, an electrostatic latent image is formed on the surface of the image holding member 34. The electrostatic latent image formed on the image carrier 34 is developed by a developing device 38 of each color, and is visualized as a toner image of each color of Y, M, C, and K.

  Further, the primary transfer rolls 52 of the primary transfer unit 18 transfer the toner images of the respective colors formed on the image carrier 34 onto the rotating intermediate transfer belt 42 in a multiplex manner.

  The toner images of each color multiplexed and transferred onto the intermediate transfer belt 42 are transferred onto a sheet P conveyed along a conveyance path 60 from a sheet feeding member 62 by a sheet feeding roll 64, a separation roll 66, and a positioning roll 68. Secondary transfer is performed at the secondary transfer position by the next transfer roll 22.

  Further, the sheet P to which the toner image has been transferred is transported to the fixing device 24. Then, the toner image is fixed on the sheet P by the fixing device 24. The paper P on which the toner image has been fixed is discharged to a discharge unit 26 by a discharge roll 28.

  On the other hand, when an image is formed on both sides of the sheet P, the sheet P on which the toner image has been fixed on one side (front side) by the fixing device 24 is not discharged to the discharge section 26 by the discharge roll 28 as it is. When the discharge roll 28 is rotated in the reverse direction, the paper transport direction of the paper P is switched. Then, the sheet P is transported along the two-sided transport path 72 by the transport rollers 74 and 76.

  The sheet P conveyed along the two-sided conveyance path 72 is turned upside down and conveyed to the positioning roll 68 again. Then, after the toner image is transferred and fixed to the other surface (back surface) of the sheet P, the sheet P is discharged to the discharge unit 26 by the discharge roll 28.

  Next, the configuration of the motor control device will be described with reference to FIG.

  FIG. 2 shows a configuration of a motor control device 40 that controls a motor 37 that drives the image holding member 34 as an example.

  As shown in FIG. 2, the motor 37 is driven by a drive circuit 35. The drive circuit 35 has an output terminal OUT and a plurality of input terminals IN.

  The output terminal OUT outputs a monitoring signal (monitor signal) for monitoring the state of the motor 37. That is, the output terminal OUT is a terminal that outputs a monitor signal for monitoring the operation state of the motor 37 as an example in the present embodiment. In the present embodiment, the operation state to be monitored is the torque of the motor 37, and the monitoring signal is the current consumption of the motor. It is known that the torque of the motor in the operating state is proportional to the current consumption of the motor. Therefore, by monitoring the torque of the motor 37 via the consumed current, the operating state of the motor 37 can be grasped. The monitoring of the torque is performed, for example, to predict an increase in the load of the image holding member 34. Hereinafter, the relationship between torque and current consumption may be referred to as “monitoring signal characteristics”. The operation target to be monitored is not limited to the torque of the motor 37, but may be a rotation speed or the like.

  The input terminal IN is, for example, a terminal for inputting a signal for instructing start or stop of rotation of the motor 37, a terminal for inputting a clock signal, and a signal for instructing stop of rotation of the motor 37 or release of stop of rotation. A terminal for inputting the signal, a terminal for inputting a signal for instructing the rotation direction (forward rotation or reverse rotation) of the motor 37, and the like are not limited to these.

  The motor control device 40 includes a receiving unit 41 and a control unit 44. The receiving unit 41 is connected to the output terminal OUT of the drive circuit 35 and receives the monitoring signal output from the output terminal OUT of the drive circuit 35. The control unit 44 controls the drive circuit 35 based on the monitoring signal received by the receiving unit 41. The hardware configuration of the control unit 44 includes a computer (not shown) including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a nonvolatile memory, an input / output interface, and the like.

  Here, in a device using a motor, it may be necessary to monitor the torque or the rotation speed of the motor as in the present embodiment. On the other hand, since the torque or the rotation speed of the motor is substantially proportional to the current consumption as described above, the torque or the rotation speed can be monitored using the current consumption. In this case, the relationship between the torque or the number of revolutions of the motor and the current consumption (monitoring signal characteristic) is stored in the device in advance, and the motor is controlled with reference to the monitoring signal characteristic. With this method, operation control is performed in accordance with the characteristics of the motor.

  Here, when there are a plurality of types of motors constituting a certain device due to different manufacturers, etc., the relationship between the torque or the number of rotations and the current consumption differs depending on the type of the motor, so that the monitoring signal characteristics also correspond to the plurality of motors. It is necessary to store more than one. Then, when controlling the motor in the apparatus, the monitoring signal characteristic is selected according to the motor being used, and the motor is controlled using the selected monitoring signal characteristic. Therefore, for example, when it is desired to control the motor immediately after the power of the apparatus is turned on, it is necessary to select the monitoring signal characteristic when the power is turned on. However, although there are differences in the monitoring signal characteristics for each type of motor, it is difficult to determine the motor based on, for example, two or three point characteristics.

  On the other hand, as described above, only the output terminal OUT outputs a signal from the drive circuit 35 to the motor control device 40, and is assigned as a terminal that outputs a monitoring signal. That is, a dedicated terminal for outputting an identification signal for identifying the type of the motor 37 is not provided. For this reason, it is difficult to identify the type of the motor 37 by normal control.

  Thus, in the present embodiment, a conversion monitoring signal obtained by converting the relationship between the operating characteristics (torque or rotation speed) of the motor and a monitoring signal (current consumption) for monitoring the operating characteristics by a different method for each type of motor is used. The type of motor was identified. As a result, the difference in the conversion monitoring signal for each motor can be remarkable, so that the type of the motor can be easily identified, and as a result, even if a different type of motor is connected, the characteristics of the motor can be matched. A motor control device and an image forming apparatus capable of operation control are provided.

  In addition, the relationship between the monitoring signal characteristic and the conversion monitoring signal is stored in a storage means such as a ROM (not shown) as a look-up table, for example, and is converted as needed. According to the present embodiment, the original function of monitoring the current consumption is not impaired. Furthermore, since there is only one type of signal output from the output terminal OUT, there is no interference with other output signals, and the level of the signal at the output terminal OUT can be freely set, so that the number of inputs to the connection destination, etc. There is no restriction.

  More specifically, when the power of the image forming apparatus 10 is turned on and the motor control device 40 starts up, one or more operation instructions including, for example, torque and the like are sent to the motor 37, and a conversion monitoring signal corresponding to the operation instruction is transmitted. (Current consumption) is received by the receiving unit 41. The conversion monitoring signal at this time is obtained by converting the monitoring signal characteristic by a different conversion method for each type of the motor 37, and has a value unique to the motor 37. Therefore, the control unit 44 identifies the type of the motor 37 from the correspondence between the designated operation instruction (torque) and the conversion monitoring signal received by the receiving unit.

  Next, an example of the relationship between the operation characteristic (torque) and the conversion monitoring signal, that is, the current consumption (hereinafter, “output characteristic”) will be described with reference to FIG. FIG. 3 shows an example in which two motors 37 are identified, and shows output characteristics of the motors A and B. As shown in FIG. 3, in this example, the output characteristics of the motor A and the motor B are each approximated by a straight line, and the sign of the slope of the straight line is changed. That is, in this example, the inclination of the motor A is negative, and the inclination of the motor B is positive.

  In this case, for example, when a relatively low torque operation instruction of 0.5 N · m is given to the motor 37, the current consumption of the motor A is about 4.5A and the current consumption of the motor B is about 0.4A. The slope of the output characteristic is determined from the measured current value, and it is easy to determine whether the connected motor is the motor A or the motor B. However, since these current values are different from the actual values, the correspondence between the actual monitoring signal characteristics of each of the motors A and B is stored in, for example, a ROM (not shown) in the form of a table. Get the value. In this example, a mode in which a low-torque operation instruction is given to the motor 37 to identify the motors A and B is exemplified. However, the present invention is not limited to this, and a high-torque operation instruction, for example, an operation instruction of 2.5 N · m is provided. May be given.

  Next, with reference to FIG. 4, the motor control process executed in image forming apparatus 10 according to the present embodiment will be described more specifically. FIG. 4 is a flowchart showing the flow of processing of the motor control processing program according to the present embodiment. In the image forming apparatus 10 according to the present embodiment, the processing shown in FIG. The CPU reads the motor control processing program stored in the RAM, expands the program in a RAM or the like, and executes the program.

  As shown in FIG. 4, first, in step S100, an instruction to rotate the motor 37 with a low torque (0.5 N · m in the example shown in FIG. 3) is sent to the drive circuit 35 to rotate it. Then, the current consumption (conversion monitoring signal) at that time is obtained via the receiving unit 41.

  In the next step S101, a process of identifying the motor 37 is executed. That is, in the present embodiment, the sign of the output characteristic indicated by a straight line is determined according to the procedure described with reference to FIG. If the determined sign is negative, the connected motor 37 is identified as the motor A, and if it is positive, the connected motor 37 is identified as the motor B. The output characteristics (whether the inclination is positive or negative) of the motor 37 actually connected are stored in a storage means such as a ROM (not shown), and the actual identification processing is executed by collating with the stored contents. . However, the identification of the motors A and B is not limited to this, and the value of the current consumption when the motor is rotated at a low torque may be compared with a threshold to make a determination. That is, the obtained current consumption value is compared with the threshold value shown in FIG. 3, and if the current consumption value is larger than the threshold value, it is identified as the motor A, and if smaller, it is identified as the motor B.

  In step S102, it is determined whether or not the identification result in step S101 is the motor A. When the determination is affirmative, the process proceeds to step S103, and when the determination is negative, the process proceeds to step S105.

  In step S103, control processing for the motor A is executed in response to the identification of the motor A in step S102.

  In step S104, it is determined whether an instruction to end the operation of the image forming apparatus 10 has been issued. If the determination is negative, the process returns to step S103, and the control process for the motor A is continued. On the other hand, when an affirmative determination is made in step S104, the motor control processing program ends.

  In step S105, upon not being identified as the motor A in step S102, it is determined whether or not the motor B has been identified. When the determination is affirmative, the process proceeds to step S106, and when the determination is negative, the process proceeds to step S108 to execute error processing. Since the result of neither the motor A nor the motor B cannot be obtained when the image forming apparatus 10 is normal, there is a possibility that some abnormality occurs in the image forming apparatus 10. The error processing is performed by, for example, notification via a UI (User Interface) unit (not shown) provided in the image forming apparatus 10.

  In step S106, control processing for the motor B is executed in response to the identification of the motor B in step S105.

  In step S107, it is determined whether an instruction to end the operation of the image forming apparatus 10 has been issued. If the determination is negative, the process returns to step S106, and the control process for the motor B is continued. On the other hand, if an affirmative determination is made in step S107, the motor control processing program ends.

[Second embodiment]
Referring to FIGS. 5 and 6, a motor control device and an image forming apparatus according to the present embodiment will be described. Since the configuration itself of the motor control device and the image forming apparatus according to the present embodiment is the same as that of the motor control device 40 and the image forming apparatus 10 according to the above-described embodiment, if necessary, refer to FIG. 1 and FIG. , Illustration is omitted.

  FIG. 5 shows an example of the relationship between the operation characteristic (torque) and the conversion monitoring signal, that is, the current consumption, that is, an output characteristic according to the present embodiment. FIG. 5 shows an example in which two motors 37 are identified, and shows the output characteristics of the motors A and B. As shown in FIG. 5, in this example, the output characteristics of the motor A and the motor B are each approximated by a straight line, and the slope of the straight line is changed. That is, in this example, the inclination of the motor A is a (> 0), and the inclination of the motor B is c (> 0).

  In the present embodiment, two points of torque are sent to the motor 37 as operation instructions, and current consumption when the motor 37 is rotated with each torque is obtained. In the example of FIG. 5, the motor 37 is instructed to rotate at a torque of 0.5 N · m and 2.5 N · m, for example. When the torque is 0.5 N · m, the current consumption of the motor A is about 1 A, and the current consumption of the motor B is about 0 A. On the other hand, when the torque is 2.5 N · m, both the motor A and the motor B are about 5 A. Next, the slope in the case of linear approximation is calculated from the relationship between the torque and the current consumption obtained at the two points. If the inclination value is closer to a, the motor 37 is identified as motor A, and if it is closer to c, it is identified as motor B.

  Next, with reference to FIG. 6, the motor control processing executed in image forming apparatus 10 according to the present embodiment will be described more specifically. FIG. 6 is a flowchart showing a processing flow of the motor control processing program according to the present embodiment. In the image forming apparatus 10 according to the present embodiment, for example, when the power of the image forming apparatus 10 is turned on, the CPU (not shown) provided in the control unit 44 stores the processing shown in FIG. The CPU reads the motor control processing program stored in the RAM, expands the program in a RAM or the like, and executes the program.

  In step S200, the motor 37 is rotated at a low torque (0.5 N · m in the present embodiment), and current consumption at that time is acquired via the receiving unit 41.

  In step S201, the motor 37 is rotated with a high torque (2.5 N · m in the present embodiment), and current consumption at that time is acquired via the receiving unit 41.

  In the next step S202, the motor 37 is identified. In other words, the inclination when linear approximation is calculated from the relationship between the torque and the current consumption at the two points acquired in steps S200 and S201. If the inclination is closer to a, the motor 37 is identified as the motor A, and if the inclination is closer to c, the motor 37 is identified as the motor B. The output characteristics (slope value) of the motor 37 that is actually connected are stored in storage means such as a ROM (not shown), and the actual identification processing is executed by collating with the stored contents. Alternatively, a threshold value between the inclinations a and b may be stored in a ROM or the like, and the motor A or the motor B may be identified based on the magnitude relation between the calculated inclination and the threshold value.

  The processing contents of steps S203 to S209 are the same as the processing contents of steps S102 to S108 in FIG.

  As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the scope described in the embodiment. Various changes or improvements can be made to the embodiments without departing from the gist of the present invention, and embodiments with the changes or improvements are also included in the technical scope of the present invention.

  For example, in the above-described embodiment, the case where the rotating body driven by the motor 37 is the image holding body 34 has been described. For example, the present invention is applicable to a rotating body driven by a motor such as a driving roll 46.

  In the present embodiment, the case where two types of motors are identified has been described. However, the present invention is also applied to the case where three or more types of motors are identified according to the above description.

10 Image Forming Apparatus 10A Apparatus Main Body 12 Image Processing Units 14, 14Y, 14M, 14C, 14K Toner Cartridges 16, 16Y, 16M, 16C, 16K Image Forming Unit 18 Primary Transfer Unit 22 Secondary Transfer Roll 24 Fixing Device 26 Discharge Unit 28 Discharge Roll 30 Supply / Convey Unit 32 LED Head 34 Image Holder 35 Drive Circuit 36 Charger 37 Motor 38 Developing Device 39 Developing Roll 40 Motor Controller 41 Receiver 42 Intermediate Transfer Belt 46 Driving Roll 48 Tensioning Roll 50 Auxiliary Roll 52 Primary Transfer roll 56 Cleaning blade 60 Transport path 62 Paper supply member 64 Paper supply roll 66 Separation roll 68 Alignment roll 72 Both-side transport paths 74, 76 Transport roll IN Input terminal OUT Output terminal P Paper

Claims (7)

A receiving unit that receives a conversion monitoring signal output from a monitoring signal output terminal of the motor and that converts a relationship between the operating characteristics of the motor and the monitoring signal that monitors the operating characteristics in a different manner for each type of the motor.
A control unit that performs control corresponding to the type of the motor identified from the output characteristics of the conversion monitoring signal received by the receiving unit,
Motor control device including: The operating characteristics are indicated by the number of revolutions or torque of the motor,
The monitoring signal is indicated by a current consumption;
The motor control device according to claim 1, wherein the output characteristic is represented by a current consumption corresponding to the rotation speed or the torque. The motor control device according to claim 2, wherein the control unit acquires the current consumption at a predetermined rotation speed or torque of the motor to identify a type of the motor. The output characteristic is approximated by a straight line,
The motor control device according to claim 3, wherein a sign of the inclination of the straight line differs for at least two types of the motor. The output characteristic is approximated by a straight line,
The inclination of the straight line differs for each type of the motor,
The motor control device according to claim 2, wherein the control unit obtains an inclination of the straight line to identify a type of the motor. The motor control device according to claim 5, wherein the sign of the inclination of the straight line is the same regardless of the type of the motor. A motor control device according to any one of claims 1 to 6,
A motor controlled by the motor control device;
A rotating body rotated by the motor,
An image forming apparatus comprising: the rotating body; and an image forming unit that forms an image on a recording medium.