JP-7856453-B2 - Motor control device and image forming apparatus

JP7856453B2JP 7856453 B2JP7856453 B2JP 7856453B2JP-7856453-B2

Inventors

坂本龍芳
伊藤雅俊

Assignees

キヤノン株式会社

Dates

Publication Date: 20260511
Application Date: 20220314

Claims (13)

A voltage application means that applies a first voltage to a motor having multiple coils to cause coil current to flow through the multiple coils, A current detection means for detecting the coil current, The voltage application means causes the coil current to flow through the plurality of coils in a plurality of patterns, and the current detection means causes the coil current corresponding to each pattern to be detected. A first power supply that outputs the first voltage to the plurality of coils, A second power supply that outputs a second voltage to the control means, A motor control device having voltage detection means for detecting the first voltage and the second voltage, The motor control device is characterized in that the control means corrects the coil current detected by the current detection means based on the detection result of the voltage detection means, and determines the type of motor based on the corrected coil current.
The system includes a holding means for holding the reference voltages of the first voltage and the second voltage, The motor control device according to claim 1, characterized in that the control means corrects the coil current detected by the current detection means based on the detection result of the voltage detection means and the reference voltage.
The motor control device according to claim 2, characterized in that the control means determines a correction coefficient as the ratio of the reference measurement to the measured value based on the measured value obtained as a result of detection by the voltage detection means and a reference measured value corresponding to the reference voltage, and determines a correction value for correcting the coil current based on the correction coefficient.
The holding means holds reference information indicating a reference value corresponding to the type of motor, The motor control device according to claim 3, characterized in that the control means determines the type of motor based on the corrected coil current and the reference information.
The motor control device according to claim 4 , characterized in that the control means determines the difference between a plurality of corrected coil currents and the corresponding reference value, and determines the type of motor based on the difference.
The motor control device according to claim 5, characterized in that the control means determines the magnitude order for each of the plurality of corrected coil currents, determines the magnitude order for each of the plurality of reference values, and determines that the reference value having the same magnitude order as the coil current is the reference value corresponding to the coil current .
The motor control device according to claim 6 , characterized in that the control means uses the sum of the squares of the differences obtained for each of the coil currents as the difference.
The motor control device according to claim 6 , characterized in that the control means takes the sum of the absolute values of the differences obtained for each of the coil currents as the difference.
The motor control device according to claim 5 , characterized in that the control means reacquires the coil current if the minimum difference obtained for each of the coil currents is greater than a threshold.
The motor control device according to claim 1, characterized in that the control means further determines the stopping position of the motor rotor based on the multiple coil currents.
The motor control device according to claim 1, characterized in that the control means determines the control parameters of the motor based on the type of motor.
A rotating member for transporting sheets along a transport path, Image forming means for forming an image on the sheet being transported along the transport path, A motor for driving the rotating member or the image forming means and a motor control device according to any one of claims 1 to 11 , An image forming apparatus characterized by comprising:
Image forming means for forming an image on a sheet, A voltage application means that applies a first voltage to a motor having multiple coils to cause coil current to flow through the multiple coils, A current detection means for detecting the coil current, The voltage application means causes the coil current to flow through the plurality of coils in a plurality of patterns, and the current detection means causes the coil current corresponding to each pattern to be detected. A first power supply that outputs the first voltage to the plurality of coils, A second power supply that outputs a second voltage to the control means, An image forming apparatus having voltage detection means for detecting the first voltage and the second voltage, The image forming apparatus is characterized in that the control means corrects the coil current detected by the current detection means based on the detection result of the voltage detection means, and determines the control parameters of the image forming means based on the corrected coil current.

Description

This invention relates to motor control technology. Motors are used as the driving source for each component of an image forming apparatus. Such motors are sometimes designed to selectively use multiple motors of different types. Since the characteristics of motors can differ depending on their type, the image forming apparatus needs to change its control parameters according to the type of motor being driven. Therefore, the image forming apparatus needs to determine the type of motor being driven. Patent Document 1 discloses a method for determining the motor type by measuring the time required for acceleration and deceleration of a motor. Japanese Patent Publication No. 2020-44741 Schematic diagram of an image forming apparatusControl configuration diagram of an image forming apparatusMotor control unit configuration diagramMotor configuration diagramThis diagram shows the voltage applied to the coil and the time variation of the coil current during the rotor stop position detection process.This diagram shows the maximum coil current for each coil current pattern, for each different rotor stopping position.This diagram shows the maximum coil current for each coil current pattern, for each different rotor stopping position.A diagram showing the template.Diagram illustrating the method for calculating the difference for a single template.Diagram illustrating the relationship between measured coil current and the drive power supply voltage/control power supply voltage.Diagram illustrating the relationship between the measured value V and the drive power supply voltage/control power supply voltage.Diagram illustrating the relationship between measured coil current and measured value V.A graph showing the variation in measured coil current.A flowchart showing how to determine the motor type.Diagram illustrating the relationship between measured values V1/V2 and the drive power supply voltage/control power supply voltage. The embodiments will be described in detail below with reference to the attached drawings. Note that the following embodiments do not limit the invention as defined in the claims. While multiple features are described in the embodiments, not all of these features are essential to the invention, and the features may be combined in any way. Furthermore, in the attached drawings, identical or similar configurations are given the same reference numerals, and redundant descriptions are omitted. <First Embodiment> Figure 1 is a configuration diagram of the image forming apparatus 10 according to this embodiment. The image forming apparatus 10 is, for example, a printer, copier, multifunction device, or facsimile. Sheets stored in the cassette 25 are fed into the sheet transport path by the feed roller 26. The transport roller 27 transports the fed sheets downstream. The image forming unit 1 forms a toner image on an internal image carrier based on image data and transfers the formed toner image to the sheet. The sheet with the transferred toner image is transported to the fixing unit 24. The fixing unit 24 heats and pressurizes the sheet to fix the toner image to the sheet. After the toner image is fixed, the sheet is discharged to the outside of the image forming apparatus 10. The motor 15F is a drive source that drives the rollers of the fixing unit 24. The image forming apparatus 10 may also have motors other than the motor 15F that drive other components (not shown). Figure 2 shows the control configuration of the image forming apparatus 10. The printer control unit 11 controls the entire image forming apparatus 10, including the image forming unit 1 and the fixing unit 24 described above. The printer control unit 11 has a processor (not shown) and a memory that stores programs and various control data. The processor of the printer control unit 11 performs various processes for controlling the image forming apparatus 10 by executing programs stored in the memory of the printer control unit 11. In doing so, the printer control unit 11 uses the control data stored in the memory. The communication controller 21 communicates with the host computer 22 and receives image data of the image formed by the image forming apparatus 10 from the host computer 22. The motor control unit 14 controls the motor 15F under the control of the printer control unit 11. Figure 3 shows the details of the control configuration of the motor 15F. The motor control unit 14 has a microcomputer (hereinafter referred to as "microcontroller") 51. The microcontroller 51 communicates with the printer control unit 11 via a communication port 52. The reference clock generation unit 56 of the microcontroller 51 is connected to a crystal oscillator 50 and generates a reference clock based on the output of the crystal oscillator 50. The counter 54 performs counting operations based on the reference clock. The microcontroller 51 outputs a pulse width modulation signal (PWM signal) from the PWM port 58. In this embodiment, the microcont