JP2014180137A - Motor control apparatus, motor control system, and image formation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor control apparatus capable of facilitating replacement of a stepping motor with a DC motor and achieving application to various types of hardware.SOLUTION: The motor control apparatus, controlling driving of a DC motor according to a driving condition set by stepping motor control means, includes: storage means for allowing writing of hardware setting information compatible with hardware to be connected and the driving condition, and DC motor control means for reading the hardware setting information and the driving condition from the storage means, performing setting corresponding to the hardware on the basis of the hardware setting information and controlling driving of the DC motor on the basis of the driving condition.

Description

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

  Stepping motors capable of accurately controlling the rotational position are widely used in various devices. However, in the stepping motor, there is a case where a phenomenon of step-out occurs where the control signal and the rotation of the motor are not synchronized due to an overload or a rapid speed change. For this reason, the stepping motor is set so that the electric power larger than the originally required electric power is supplied so that the generated torque is larger than the expected load torque. Therefore, the stepping motor has a problem that efficiency is poor and power consumption is increased.

  Therefore, in order to reduce power consumption, replacement of stepping motors with DC motors such as brushless DC motors, for example, is in progress. Since the generated torque of the DC motor is proportional to the drive current, the amount of power consumption can be reduced by controlling the generated torque according to the load torque as compared with the stepping motor.

  Therefore, a motor control device has been proposed in which a stepping motor control signal is converted into a DC motor control signal so that the change can be minimized and the stepping motor can be replaced with a DC motor (for example, Patent Documents). 1).

  However, in the motor control device according to Patent Document 1, it is necessary to adjust the pulse rate signal peculiar to the stepping motor according to the excitation method, resolution, gear ratio with the rotated body, etc. so as to correspond to the control of the DC motor. There is. Therefore, complicated processing may be required to replace the stepping motor with the DC motor. Moreover, since the counterpart hardware in which the motor control device is replaced with a stepping motor has various configurations, it may not operate depending on the setting of the motor control device.

  The present invention has been made in view of the above, and it is possible to easily replace a stepping motor with a DC motor, and to provide a motor control device capable of supporting various hardware. With the goal.

  According to one aspect of the present invention, there is provided a motor control device that controls driving of a DC motor in accordance with a driving condition set by a stepping motor control unit, the hardware setting information corresponding to connected hardware, and the driving A storage unit in which a condition is written; and the hardware setting information and the driving condition are read from the storage unit, the setting corresponding to the hardware is performed based on the hardware setting information, and the DC is performed based on the driving condition. DC motor control means for controlling the drive of the motor.

  According to the embodiment of the present invention, it is possible to easily replace a stepping motor with a DC motor, and to provide a motor control device that can support various hardware.

1 is a diagram illustrating a schematic configuration of an image forming apparatus according to a first embodiment. 1 is a diagram illustrating a functional configuration of an image forming apparatus according to a first embodiment. It is a figure which illustrates the drive control structure of STM by an STM control part. It is a figure which illustrates the motor control system concerning a 1st embodiment. It is a figure which illustrates the register structure defined in RAM in 1st Embodiment. It is a figure which illustrates the flowchart of the motor drive process of the STM control part in 1st Embodiment. It is a figure which illustrates the flowchart of the motor drive process of the motor control apparatus in 1st Embodiment. It is a figure which illustrates the motor control system which concerns on 2nd Embodiment. It is a figure which illustrates the register structure defined in RAM in 2nd Embodiment. It is a figure which illustrates the flowchart of the motor control process in 2nd Embodiment.

  A mode 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.

  Hereinafter, a motor control device and a motor control system capable of replacing a stepping motor with a DC motor such as a brushless DC motor will be described. In the following embodiments, an example in which a stepping motor provided in an image forming apparatus is replaced with a DC motor will be described. However, the present invention can be applied to various devices having a stepping motor even if it is not an image forming apparatus.

[First embodiment]
<Configuration of image forming apparatus>
FIG. 1 is a diagram illustrating a schematic configuration of an image forming apparatus 200 according to the first embodiment.

  As shown in FIG. 1, the image forming apparatus 200 includes an automatic document feeder (ADF) 140, an image reading unit 130, an image forming unit 110, a writing unit 120, and a paper feeding unit 150.

  The ADF 140 conveys the originals stacked on the original feeding table one by one onto the contact glass 11 of the image reading unit 130 and discharges them onto the paper discharge tray after the image data is read.

  The image reading unit 130 includes a contact glass 11 on which an original is placed, an exposure lamp 41, a first mirror 42, a second mirror 43, a third mirror 44, a lens 45, and a CCD 46. The exposure lamp 41, the first mirror 42, the second mirror 43, and the third mirror 44 scan the document while moving at a constant speed, and the reflected light from the document is imaged on the light receiving surface of the CCD 46 via the lens 45. And photoelectrically converted.

  The image data photoelectrically converted by the CCD 46 is A / D converted by an image processing circuit (not shown) and then subjected to various image processing (γ correction, color conversion, image separation, gradation correction, etc.) by the image processing circuit. The

  The writing unit 120 includes exposure devices 47y, 47m, 47c, and 47k that form electrostatic latent images of yellow (y), magenta (m), cyan (c), and black (k), respectively. When the user gives an instruction to copy an original image or prints an image as a printer, the writing unit 120 forms an electrostatic latent image corresponding to the image on the photosensitive drum for each color.

  In the image forming apparatus 200, four photoreceptor units 13y, 13m, 13c, and 13k on which toner images of respective colors are formed are arranged in parallel along the conveyance direction of the intermediate transfer belt 14. The photosensitive units 13y, 13m, 13c, and 13k include photosensitive drums 27y, 27m, 27c, and 27k, charging devices 48y, 48m, 48c, and 48k, developing devices 16y, 16m, 16c, and 16k, a cleaning device 49y, 49m, 49c, and 49k are provided, respectively. In the following description, the symbols y, m, c, and k representing colors are omitted.

  The exposure device 47 of the writing unit 120 performs exposure by, for example, an LED writing method including a light emitting diode (LED) array and a lens array. The exposure device 47 emits an LED according to the image data photoelectrically converted into each color, and forms an electrostatic latent image on the photosensitive drum 27.

  In the developing device 16, a developing roller that carries a developer and rotates supplies toner to the electrostatic latent image formed on the photosensitive drum 27, thereby forming a toner image of each color.

  Each color toner image formed on the photosensitive drum 27 is transferred onto the intermediate transfer belt 14 in a primary transfer position where the photosensitive drum 27 and the intermediate transfer belt 14 are in contact with each other.

  An intermediate transfer roller 26 is provided at a position facing the photosensitive drum 27 via the intermediate transfer belt 14. The intermediate transfer roller 26 is brought into contact with the inner peripheral surface of the intermediate transfer belt 14 to bring the intermediate transfer belt 14 into contact with the surface of each photoconductor. When the voltage is applied to the intermediate transfer roller 26, an intermediate transfer electric field for transferring the toner image on the photosensitive drum 27 to the intermediate transfer belt 14 is formed. The toner image is transferred onto the intermediate transfer belt 14 by the intermediate transfer electric field. The toner images of the respective colors are superimposed and transferred, and a full color toner image is formed on the intermediate transfer belt 14.

  At the timing when the toner image formed on the intermediate transfer belt 14 reaches the position of the secondary transfer roller 18, the recording paper 53 reaches the secondary transfer position 50 between the secondary transfer roller 18 and the repulsive roller 17. The toner image is secondarily transferred to the recording paper 53.

The recording paper 53 is fed from any of the first tray 22a, the second tray 22b, the third tray 22c, and the fourth tray 22d. Each of the paper feed trays 22a to 22d feeds the recording paper 53 accommodated therein sequentially from the top, a paper feed roller 28, and separates the fed recording paper 53 and sends them out to the transport path 23. A separation roller 31 and a plurality of conveying roller pairs 29 are provided.

  The transport roller pair 29 sends the recording paper 53 transported from the paper feed tray 22 toward the transport roller pair 29 at the subsequent stage and the paper feed path 32 of the image forming unit 110. After the leading edge of the recording paper 53 fed into the paper feed path 32 is detected by the registration sensor 51, it is abutted against the registration roller 33 and stops once. The registration roller 33 feeds the sandwiched recording paper 53 to the secondary transfer position 50 at a predetermined timing. The predetermined timing is a timing at which the full color toner image formed on the intermediate transfer belt 14 is conveyed to the secondary transfer position 50.

  The full color toner image on the intermediate transfer belt 14 is transferred to the recording paper 53 at the secondary transfer position 50 between the secondary transfer roller 18 and the repulsive roller 17, and is conveyed to the fixing device 19 by the conveyance belt 24.

  The fixing device 19 includes a heating roller 25 and a pressure roller 12, and heats and presses the recording paper 53 to fix the full color toner image on the recording paper 53. The recording paper 53 on which the full color toner image is fixed by the fixing device 19 is discharged onto the paper discharge tray 21.

  In the image forming apparatus 200, for example, a stepping motor (hereinafter referred to as “STM”) is used to drive the paper feed roller 28, the conveyance roller pair 29, the photosensitive drum 27, and the like. Hereinafter, it will be replaced with “DCM”. Examples of the DCM that replaces the STM include a brushed DC motor and a brushless DC motor.

  The image forming apparatus 200 is exemplified by an image forming apparatus that forms an image on the recording paper 53 by an electrophotographic method, but the image is formed by another image forming method such as an ink jet method that forms an image by ejecting ink droplets. An image forming apparatus to be formed may be used.

<Hardware configuration of image forming apparatus>
FIG. 2 is a diagram illustrating a hardware configuration of the image forming apparatus 200 according to the first embodiment.

  As shown in FIG. 2, the image forming apparatus 200 includes a controller 210, a scanner 220, a printer 230, a modem 240, an operation panel 250, a network I / F unit 260, a recording medium I / F unit 270, and an STM control unit 300. .

  The controller 210 includes a CPU 211, RAM 212, ROM 213, HDD 214, NVRAM 215, and the like. The ROM 213 stores various programs and data used by the programs. The RAM 212 is used as a storage area for loading a program, a work area for the loaded program, and the like. The CPU 211 realizes various functions by processing a program loaded in the RAM 212. The HDD 214 stores a program and various data used by the program. The NVRAM 215 stores various setting information and the like.

  The scanner 220 is hardware (image reading unit) for reading image data from a document. The printer 230 is hardware (image forming unit) for printing an image on a recording medium. The modem 240 is hardware for connecting to a telephone line, and is used to execute transmission / reception of image data by FAX communication. The operation panel 250 is hardware including an input unit such as a button for accepting input from a user, an operation screen such as a liquid crystal panel having a touch panel function, and the like.

  The network I / F unit 260 is hardware for connecting to a network such as a LAN (whether wired or wireless). The recording medium I / F unit 270 is an interface with the recording medium 271. The image forming apparatus 200 can read and / or write the recording medium 271 via the recording medium I / F unit 270. The recording medium 271 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.

  The STM control unit 300 controls the driving of an STM provided to drive the paper feed roller 28, the transport roller pair 29, the photosensitive drum 27, and the like in the image forming apparatus 200, for example.

  FIG. 3 is a diagram illustrating a configuration when the STM control unit 300 controls driving of the STM 320. As shown in FIG. 3, the STM control unit 300 can control the driving of the STM 320 via the STM driving unit 310.

  The STM control unit 300 includes a CPU 301, a ROM 302, and a RAM 303.

  The CPU 301 performs control calculations based on data stored in the ROM 302 and RAM 303. The ROM 302 stores data necessary for driving the motor, such as a control program of the STM 320 and a target speed of the STM. The RAM 303 stores data temporarily used for motor control.

  The STM drive unit 310 includes an STM control IC 311 and a driver 312, and drives the STM 320 in response to a request from the STM control unit 300.

  In the register of the STM control IC 311, for example, the STM control unit 300 writes drive conditions such as the target rotation speed, rotation direction, and slow table of the STM 320. The STM control IC 311 generates a drive signal based on the drive condition written in the register and outputs it to the driver 312. The driver 312 supplies a drive current to the STM 320 based on the drive signal, and the STM 320 is driven under the set drive condition by the drive current supplied from the driver 312.

<Configuration of motor control system>
FIG. 4 is a diagram illustrating the configuration of the motor control system 400 according to the first embodiment.

  The motor control system 400 can drive the DCM 460 based on a request from the STM control unit 300. By replacing the STM drive unit 310 and the STM 320 shown in FIG. 3, the replacement from the STM 320 to the DCM 460 is realized. it can.

  The motor control system 400 includes a motor control device 410 and a DCM 460, and the motor control device 410 is mounted on the control board 500 in place of the STM driving unit 310.

  The control board 500 is provided with an STM control unit 300, a motor control device 410, a crystal oscillator 510 as an example of a clock supply means, an ASIC 520 and an FPGA 530 for realizing various functions.

  The motor control device 410 includes an interface unit 420, a DCM control unit 430, a DCM drive unit 440, and a speed detection unit 450.

  The interface unit 420 includes a RAM 421 as an example of a storage unit. The RAM 421 is a dual port RAM accessible from both the STM control unit 300 and the DCM control unit 430. In the RAM 421, motor driving conditions, hardware setting information, and the like are written by the STM control unit 300.

  The DCM control unit 430 reads hardware setting information from the RAM 421 and performs various settings in the DCM driving unit 440 and the speed detection unit 450. Further, the driving condition is read from the RAM 421, and the DCM 460 is driven via the DCM driving unit 440 and the speed detecting unit 450 based on the driving condition.

  The DCM control unit 430 includes a CPU 431, a ROM 432, and a RAM 433, and transmits a drive signal to the DCM drive unit 440 based on the drive condition written in the RAM 421 of the interface unit 420. The CPU 431 performs a control calculation of the DCM 460 based on data stored in the ROM 432 and the RAM 433. The ROM 432 stores a control program for the DCM 460 and the like. The RAM 433 stores data temporarily used for motor control.

  The DCM drive unit 440 includes an ASIC 442 having a PWM generation circuit 441, a pre-driver 443, and a driver 444. The PWM generation circuit 441 generates a PWM signal based on the drive signal transmitted from the DCM control unit 430. The pre-driver 443 generates a signal necessary for driving the DCM 460 based on the PWM signal, and the driver 444 amplifies the signal generated by the pre-driver 443 and outputs the amplified signal to the DCM 460.

  The speed detection unit 450 includes an ASIC 452 having an input capture 451, an encoder sensor 453, and a code wheel 454 as an example of a detection unit that detects rotation of the DCM 460, and detects the rotation speed of the DCM 460. The input capture 451 receives a pulse signal output by the encoder sensor 453 reading a code wheel 454 provided on the rotating shaft or the like of the DCM 460, and measures the period of the pulse signal. The speed detection unit 450 detects the rotational speed of the DCM 460 using the encoder sensor 453 and the code wheel 454, but other speed detection means such as a magnetic encoder may be used.

  Based on the set target speed and the actual speed of DCM 460 calculated based on the period of the pulse signal output from speed detection section 450, DCM control section 430 performs DCM 460's feedback control such as PID control, for example. Control the drive.

(RAM register configuration)
The RAM 421 of the interface unit 420 is arranged on the same address as the STM control IC 311 of the STM drive unit 310, and at least partially has a register configuration defined in the same configuration and arrangement as the registers of the STM control IC 311.

  FIG. 5 is a diagram illustrating a register configuration defined in the RAM 421. Each register illustrated in FIG. 5 is defined in the RAM 421 together with an address and a (read / write) direction from the STM control unit 300.

  The RAM 421 has a register configuration in which motor driving conditions are written by the STM control unit 300, such as “target speed setting register”, “rotation direction setting register”, “start / stop request register”, and “slow table setting register”. Is defined. These register configurations are the same as the register configurations of the STM control IC 311 in which writing is performed by the STM control unit 300, and the STM control unit 300 is similar to writing the drive conditions in the registers of the STM control IC 311 when driving the STM 320. The driving condition can be written in the RAM 421.

  The DCM control unit 430 can acquire a driving condition from each register of the RAM 421 and drive the DCM 460 based on the acquired driving condition. Therefore, the STM control unit 300 can drive the DCM 460 similarly to the case of driving the STM 320, and the STM drive unit 310 and the STM 320 can be replaced with the motor control system 400, and the replacement from the STM 320 to the DCM 460 is easy. Can be realized.

  Further, in the RAM 421, function extension registers such as “control gain setting register”, “acceleration setting register”, “deceleration setting register”, “table / acceleration / deceleration selection register” are defined as shown in FIG. Also good.

  For example, the STM control unit 300 can set the control gain used for controlling the DCM 460 by the “control gain setting register”, and set the acceleration / deceleration profile at the time of acceleration / deceleration by the “acceleration setting register” and the “deceleration setting register”. It becomes possible. In addition, the “table / acceleration / deceleration selection register” can designate which of the slow table and the acceleration / deceleration profile is used.

  Thus, by defining the function expansion register in the RAM 421, not only the replacement from the STM 320 to the DCM 460 but also the function expansion in which the STM control unit 300 changes the control condition of the DCM 460 can be performed.

  Further, the RAM 421 may define a register for performing clock settings such as a “clock prescaler setting register” and a “cycle setting register” as a hardware setting register.

  As shown in FIG. 4, the motor control device 410 is mounted on the control board 500 together with the ASICs 520 and 530 FPGA 530 in addition to the STM control unit 300. A clock distributed from one crystal oscillator 510 provided on the control board 500 is supplied to each device mounted on the control board 500.

  The DCM control unit 430 controls the driving of the DCM 460 by, for example, PID control based on the target speed set by the STM control unit 300 and the rotational speed of the DCM 460 detected by the speed detection unit 450. The DCM control unit 430 needs to perform the PID control calculation at a constant control cycle, but the crystal oscillator 510 as the clock supply unit may not be optimized for the PID control cycle by the DCM control unit 430.

  Therefore, the STM control unit 300 writes the clock prescaler setting and cycle setting corresponding to the crystal oscillator 510 in the “clock prescaler setting register” and “cycle setting register” of the RAM 421. The DCM control unit 430 reads these settings from the RAM 421 and sets the clock, thereby enabling optimal setting of the control cycle required for PID control.

  Further, as shown in FIG. 5, a hardware setting register for performing input / output logic settings such as an “input signal logic setting register” and an “output signal logic setting register” may be defined in the RAM 421.

  For example, in the motor control system 400 illustrated in FIG. 4, when the pre-driver 443, the driver 444, the encoder sensor 453, etc. are changed, the logic circuit 445 of the DCM drive unit 440 and the logic circuit 455 of the speed detection unit 450 are changed. The logic may be reversed.

  Therefore, the STM control unit 300 sets the input signal logic from the PWM generation circuit 441 in the DCM driving unit 440 to the pre-driver 443 as an example of the driving circuit in the “input signal logic setting register” of the RAM 421. Further, the output signal logic from the encoder sensor 453 of the speed detector 450 to the input capture 451 is set in the “output signal logic setting register” of the RAM 421.

  The DCM control unit 430 reads the hardware setting register of the RAM 421 and sets the input signal logic in the DCM drive unit 440 and the output signal logic in the speed detection unit 450. When the DCM control unit 430 performs logic setting, the DCM 460 can be normally controlled even when the pre-driver 443, the driver 444, the encoder sensor 453, and the like are changed.

  In addition, as shown in FIG. 5, a hardware setting register for setting the code wheel of the speed detection unit 450, such as a “code wheel resolution setting register” and a “code wheel pulse number setting register”, may be defined in the RAM 421. good.

  For example, the size of the code wheel 454 is changed according to the restrictions on the arrangement position mechanism, and the number of pulses per rotation of the code wheel 454 that the encoder sensor 453 detects and outputs the slit, or per pulse The amount of rotation of the DCM 460 may change. Since the number of pulses output from the encoder sensor 453 changes due to the change of the code wheel 454 and the rotational speed of the DCM 460 may be erroneously detected, the setting needs to be changed according to the code wheel 454.

  Therefore, when the code wheel 454 is changed, the STM control unit 300 sets the code wheel 454 in the “code wheel resolution setting register” and the “code wheel pulse number setting register” in the RAM 421.

  The DCM control unit 430 reads the hardware setting register of the RAM 421 and sets the code wheel 454 to detect the rotational speed of the DCM 460 and perform drive control even when the code wheel 454 is changed. be able to.

  As described above, the RAM 421 defines, for example, clock settings, input / output logic settings, code wheel settings, and the like as hardware setting registers. The DCM control unit 430 reads the hardware setting register and performs various settings, so that the DCM 460 can be normally controlled even when the hardware is changed. Therefore, the motor control system 400 can easily replace the STM 320 with the DCM 460, and can change the hardware setting according to the replacement environment. Therefore, the motor control system 400 can be applied to various devices. is there.

  Note that the register configuration of the RAM 421 is appropriately defined according to the driving conditions of the STM 320 set by the STM control unit 300, and is not limited to the example shown in FIG. The hardware setting register provided in the RAM 421 may be any one or more of clock setting, input / output logic setting, and code wheel setting, for example. The interface unit 420 may be an ASIC or FPGA having a register having the configuration illustrated in FIG. 5 as an example of a storage unit.

<Motor drive control processing>
Next, the motor driving process when driving the DCM 460 will be described based on the flowcharts illustrated in FIGS. 6 and 7.

  FIG. 6 is a diagram illustrating a flowchart of the motor driving process of the STM control unit 300.

  When starting the DCM 460 (step S101: Yes), the STM control unit 300 writes the driving conditions in the RAM 421 of the interface unit 420 of the motor control device 410 in step S102. In step S103, the control condition is written in the RAM 421, and in step S104, the hardware setting is written in the RAM 421.

  The STM control unit 300 sets, for example, a target speed, a rotation direction, a slow table, and the like as driving conditions, and sets, for example, a control gain, acceleration, deceleration, and the like as control conditions. For example, clock settings, input / output logic settings, code wheel settings, and the like are set as hardware settings.

  Next, in step S105, the STM control unit 300 sets the “start / stop request register” in the RAM 421 to “ON”. Thereafter, when the DCM 460 is to be stopped (step S106: Yes), the “start / stop request register” of the RAM 421 is set to “OFF” in step S107, and the process is ended.

  FIG. 7 is a diagram illustrating a flowchart of the motor driving process of the motor control device 410.

  The DCM control unit 430 checks the register of the RAM 421 at a constant cycle. If the “start / stop request register” is “ON” (step S201: Yes), the DCM control unit 430 reads each register of the RAM 421 in step S202. Read driving conditions. In step S203, the control condition is read from each register of the RAM 421. In step S204, the hardware setting is read from each register of the RAM 421.

  In step S <b> 205, the DCM control unit 430 drives the DCM 460 based on the driving conditions, control conditions, and hardware settings read from each register of the RAM 421.

  The DCM control unit 430 checks the register of the RAM 421 at a constant cycle, and when the “start / stop request register” is “OFF” (step S206: Yes), after stopping the DCM 460 in step S207, The process ends.

  As described above, according to the motor control system 400 according to the first embodiment, the STM control unit 300 can drive the DCM 460 by the same process as when the STM 320 is driven. When driving the DCM 460 replaced with the STM 320, the STM control unit 30 drives the DCM 460 by writing the driving condition in the RAM 421 of the interface unit 420 in the same manner as writing the driving condition in the register of the STM control IC 311. Can be made.

  In addition, since the RAM 421 includes the hardware setting register, the DCM control unit 430 can read the hardware setting and perform the setting according to the environment, and can replace the STM 320 with the DCM 460 in various apparatuses.

  Further, when the RAM 421 has a function expansion register, the STM control unit 300 can change the setting of the DCM 460 by writing various control conditions of the DCM 460 into the function expansion register of the RAM 421.

  As described above, according to the motor control system 400 according to the first embodiment, the replacement from the STM 320 to the DCM 460 can be easily performed, and it is possible to deal with various hardware.

[Second Embodiment]
Next, a second embodiment will be described based on the drawings. Note that a description of the same components as those of the above-described embodiment will be omitted.

  FIG. 8 is a diagram illustrating a configuration of a motor control system 400 according to the second embodiment. The motor control system 400 according to the second embodiment is different from the first embodiment in that an interrupt generation circuit 422 is included in the interface unit 420.

  The interrupt generation circuit 422 generates an interrupt signal when, for example, writing is performed to any register of the RAM 421 or when writing is performed to a specific register of the RAM 421.

  For example, the interrupt generation circuit 422 transmits an interrupt signal to the DCM control unit 430 when the STM control unit 300 writes in the “start / stop request register” of the RAM 421. The DCM control unit 430 starts or stops the DCM 460 according to the interrupt signal.

  As described above, the DCM control unit 430 controls the DCM 460 according to the interrupt signal, so that the control responsiveness of the DCM 460 is improved as compared with the case where the control is performed by checking the register of the RAM 421 at the polling period, for example. . Therefore, for example, the start / stop timing of the DCM 460 can be strictly controlled.

  FIG. 9 is a diagram illustrating a register configuration defined in the RAM 421 in the second embodiment. As shown in FIG. 9, the RAM 421 is provided with, for example, an “interrupt enable / disable setting register”, an “interrupt status register”, an “interrupt factor register”, and the like.

  Note that the register configuration of the RAM 421 is not limited to the configuration illustrated in FIG. 9 and can be set as appropriate. The interface unit 420 may be an ASIC or FPGA having a register and an interrupt generation circuit configured as illustrated in FIG. 9 as an example of a storage unit.

  FIG. 10 is a diagram illustrating a flowchart of a motor control process from the start of the DCM 460 to the completion of acceleration in the second embodiment.

  First, in step S <b> 301, the STM control unit 300 writes drive conditions, drive conditions, and hardware settings in the RAM 421 of the interface unit 420. Next, in step S302, the interrupt permission upon completion of acceleration is set in the “interrupt permission / inhibition setting register” in the RAM 421, and in step S303, the “start / stop request register” is set to “ON”.

  In step S304, in response to the “start / stop request register” of the RAM 421 being set to “ON” by the STM control unit 300, the interrupt generation circuit 422 generates an interrupt signal and transmits it to the DCM control unit 430.

  The DCM control unit 430 waits for the activation request interrupt signal to be transmitted, and when receiving the interrupt signal from the interrupt generation circuit 422 (step S305: Yes), in step S306, sets the “interrupt factor register” in the RAM 421. clear. Subsequently, in step S307, the driving condition and the driving condition are read. In step S308, the DCM control unit 430 drives the DCM 460 based on the driving condition and the driving condition.

  Next, in step S309, the DCM control unit 430 determines, based on the detection result of the speed detection unit 450, whether the rotational speed of the DCM 460 has reached the target speed and the acceleration control has been completed. If the DCM control unit 430 determines that the acceleration of the DCM 460 has been completed (step S309: Yes), it sets “acceleration complete” in the “interrupt factor register” of the RAM 421 in step S310.

  In step S <b> 311, the interrupt generation circuit 422 generates an interrupt signal and transmits it to the STM control unit 300 in response to the “interrupt state register” being set to “acceleration complete” by the DCM control unit 430.

  The STM control unit 300 waits for an acceleration completion interrupt signal to be transmitted, and when receiving the interrupt signal from the interrupt generation circuit 422 (step S312: Yes), confirms the interrupt factor in step S313. After confirming the interrupt factor, in step S314, the “interrupt factor register” is cleared, and the acceleration control process of the DCM 460 is terminated.

  In this manner, the interrupt generation circuit 422 generates an interrupt signal in accordance with the writing to the register of the RAM 421, so that, for example, the DCM control unit 430 can control the start timing of the DCM 460. Since the DCM 460 can be started when the STM control unit 300 sets the “start / stop request register” to “ON” without waiting for the polling cycle of the DCM control unit 430, the start timing of the DCM 460 is strictly controlled. It becomes possible.

  The interrupt generation circuit 422 generates an interrupt signal when the “start / stop request register” is set to “OFF” by the STM control unit 300, and sets the DCM control unit 430 to stop driving the DCM 460. You can also. In this case as well, it is possible to strictly control the stop timing of the DCM 460 by the DCM control unit 430.

  As described above, according to the motor control system 400 according to the second embodiment, it is possible to replace the STM 320 with the DCM 460 and to strictly control the start or stop of the DCM 460, for example. Become.

  Although the motor control device, the motor control system, and the image forming apparatus according to the embodiments have been described above, the present invention is not limited to the above embodiments, and various modifications and improvements can be made within the scope of the present invention. is there.

200 Image forming apparatus 320 STM (stepping motor)
400 Motor control system 410 Motor control device 421 RAM (storage means)
422 interrupt generation circuit (interrupt signal generation means)
430 DCM controller (DC motor control means)
440 DCM controller (DC motor driving means)
450 Speed detector (speed detector)
460 DCM (DC motor)

JP 2011-114951 A

Claims (9)

A motor control device for controlling the driving of a DC motor according to the driving conditions set by the stepping motor control means,
Storage means in which hardware setting information corresponding to the connected hardware and the driving conditions are written;
A DC motor that reads the hardware setting information and the driving condition from the storage unit, performs settings corresponding to the hardware based on the hardware setting information, and controls the driving of the DC motor based on the driving condition Control means;
A motor control device comprising: The motor control device according to claim 1, wherein the hardware setting information includes setting information of a clock used by the DC motor control unit. DC motor driving means that is controlled by the DC motor control means and drives the DC motor,
3. The motor control device according to claim 1, wherein the hardware setting information includes setting information of output signal logic to a driving circuit provided in the DC motor driving unit and driving the DC motor. . Speed detecting means for detecting the rotational speed of the DC motor based on the output of the detecting means for detecting the rotation of the DC motor;
4. The motor according to claim 1, wherein the hardware setting information includes at least one of setting information of input signal logic from the detection unit and setting information of the detection unit. 5. Control device. 5. The motor control device according to claim 1, wherein the storage unit includes a region in which a control condition of the DC motor is written by the stepping motor control unit. 6.   The motor control device according to claim 1, wherein the storage unit is a RAM.   The motor control apparatus according to any one of claims 1 to 6, wherein the DC motor is a brushless DC motor. The motor control device according to any one of claims 1 to 7, the DC motor,
A motor control system comprising: The motor control device according to any one of claims 1 to 7,
Image forming means for forming an image on a recording medium based on the image data;
An image forming apparatus comprising:

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