JP2000078889A - Device and method for controlling drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily control the drive of a motor by reducing the load of a CPU by generating a phase signal based on switching timing information contained in read out motor control data. SOLUTION: Control processing that can reduce the load of a CPU 2 by automatically generating a phase signal based on switching timing information is provided. In other words, motor control data 30 contain the switching timing information of the phase signal and normal complicated control is dissolved by automatically generating the phase signal by means of a gate array 4 based on the switching timing information. In the data section of the motor control data 30, the fifteenth and eighth bits usually mean the phase signal. The fifteenth bit is used as the bits of the switching timing information instead of the phase signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device and a drive control method for driving and controlling a motor, and more particularly to a drive control device and a drive control device for performing recording on a recording medium by operating a recording head by the motor. It relates to a drive control method.

[0002]

2. Description of the Related Art Conventionally, a recording apparatus having functions such as a printer, a copying machine, and a facsimile, or a recording apparatus used as an output device of a multifunction machine or a workstation including a computer or a word processor, etc., is based on paper based on image information. Generally, it is configured to record an image (including characters and symbols) on a recording material such as a sheet or a plastic thin plate (OHP sheet).

[0003] In a serial type recording apparatus that employs a method of recording in the main scanning direction along a direction intersecting with the recording material conveyance direction (sub-scanning direction), a carriage that moves along the recording material (main scanning direction). An image (including characters and symbols) is recorded by a recording means (recording head) mounted thereon, and after a recording of one line is completed, a predetermined amount of paper feed (sub-scan) is performed, and then a next line is recorded. Record an image (sub-scan)
By repeating this operation, an image is recorded in a desired range of the recording material.

As a motor used in such a recording apparatus, a line field motor, a carriage motor, a paper feeding motor, and a recovery motor for a recording head are currently generally a DC motor or a stepping motor controlled by a pulse. .

Here, a stepping motor will be described.

[0006] Due to the nature of the stepping motor, positioning control can be performed in an open loop without a feedback system. The fact that positioning control can be performed in an open loop in this way leads to simplification of the system and is extremely advantageous in terms of cost. For this reason, stepping motors are widely used in OA equipment-related control systems.

As a motor driving method, there are a constant current driving method, a constant voltage PWM driving method, a micro step driving method and the like.

[0008] The constant current drive system is a drive system for controlling the current flowing through the stepping motor to be always constant. Among them, the chopper drive system has a lighter load on the power transistor and is more efficient than the analog drive system. Since it is a driving method, it is used relatively frequently.

Conventionally, the PWM driving method changes the time width of a voltage applied to a transistor of a motor driver to create an arbitrary current waveform. Actually, a desired current waveform is obtained by dividing one phase into a plurality of parts and setting whether or not to apply a voltage for each division. In general, when the current waveform is closer to the Sin curve, smooth driving can be obtained with less vibration.

In the micro-step driving method, the basic step angle is further refined by circuit technology, and it is possible to realize the step driving of a minute angle. Therefore, there is also an effect of reducing the vibration of the rotor. In principle, the stationary point of the rotor is determined by supplying an arbitrary drive current to each of the two excitation coils. If the exciting current is increased as a property of the magnetic circuit, the generated magnetic field becomes correspondingly strong, and the stationary point of the rotor can be set arbitrarily.

A conventional drive control method using the above-described drive system will be described.

FIG. 4 shows a conventional configuration example. 2 is CPU
And 3 is R in which the motor control table is stored.
OM. Reference numeral 14 denotes a motor driver for motor control. The motor driver 14 is a stepping motor driver of a constant current chopping method, has a micro-step driving function, and is capable of switching a current value to be chopped in 16 steps. The input interface of the motor driver 14 is set for serial transfer, and is configured to input control data by three signals STB, DATA, and CLK.

FIG. 5 shows a motor driver 14 of control data.
1 shows the contents of data transfer for one range. FIG. 6 shows a serial transfer data system for controlling the motor, in which one word (WORD) is treated as one command. In this one word, the motor drive current direction (PH
ASE signal), current value setting, PO for current value MAX
Control bits such as WER DOWN are included. Here, the function of data forming one word will be described.

PHASE: Hi: OUTA → OUTA bar, Low: OUTA bar → OUTA Current; 16 bits can be switched by 4 bits for A phase.

The 16 resolution is set to be a pseudo sine wave.

DECAY; Hi: SLOW DECAY, Low: MIX DECAY MODE MIX DECAY; Hi: 60% FAST DECAY TORQUE; Low: 40% FAST DECAY TORQUE; , 1: 10 → 70% TORQUE0, 1: 00 → 50% FIG. 7 shows a current waveform of a phase signal (A phase, B phase) for driving the motor. In this case, in order to drive the motor for one range (one range is defined as 1/16 step obtained by dividing one step into 16), one word (= 16 bits) of control data is required. . Thus, the control data amount for driving one step is 16 words.

[0017]

In the conventional example, the command in the control data includes an information bit indicating a motor drive current direction (PHASE signal) as shown in FIG. For this reason, a control program for controlling the driving of the motor is complicated, and the load on the CPU is increased. Hereinafter, a specific example will be described.

FIG. 3 shows one step as four steps (including 0).
5 shows the A-phase and B-phase motor drive current directions (PHASE signal) and the waveforms of the current values when the current values are changed. In this case, the excitation start phase of the motor is
Due to misalignment at the time of motor installation, a, b,
I do not know where c and d start.

For example, FIG. 8 shows an actual control table when the excitation start phase is at the position a in FIG.

Here, the data of one step consists of four words, and the arrangement of the data follows FIG. Bits 2, 3, 9, and 10 in the data are related to the chopping method of the driver and have no meaning here, so they are denoted by X.

In FIG. 8, bits 4 to 7 are data of a B-phase signal, and bits 11 to 14 are data of an A-phase signal. Bit 15 is the motor drive current direction (PHASE
Signal). In this case, bit 15
Changes to "1" or "0", the motor drive current direction changes.

Similarly, FIG. 9 shows that the excitation start phase is
4 shows an actual control table in the case of a position.

Assuming that the start address is 1000
Address 00, and the table in the case where the excitation start phase is the B phase naturally starts from the data at address 100008 when the excitation start phase is a. That is, since the excitation start phase has four points and is not always constant, it is necessary to change the storage location of the table according to the excitation start phase. Another method is to shift the start address.

In these two methods, the end excitation address becomes insufficient by the amount shifted at the start of excitation.
This involves adding a predetermined table. As a result, the program becomes complicated and the load on the CPU increases. Further, in the case of the reciprocating operation, even if the starting point is the same, the phase goes forward and backward, so that the control method is further complicated. The causes of such complicated control processing are the current value and the motor drive current direction (P
HASE signal) in the control table.

An object of the present invention is to provide a drive control device and a drive control method capable of reducing the load on a CPU and performing simple drive control.

[0026]

SUMMARY OF THE INVENTION The present invention relates to an apparatus for controlling the driving of a motor, which stores motor control data including switching timing information of a phase signal indicating a driving direction of the motor, and the motor control data. Memory means, a read means for reading the stored motor control data, and a generating means for generating the phase signal based on the switching timing information included in the read motor control data. And a drive control device.

Here, the generation means may include a gate array.

The semiconductor device may further include a register for setting the switching timing information of the phase signal, and a selection unit for selecting an operation by the register and an operation by the gate array.

The motor control data is performed by serial command transfer, and the switching timing information includes:
The information related to the phase signal indicating the driving direction of the motor included in one transfer command may be replaced information.

The reading means may be a DMA control circuit.

Further, the present invention constitutes a recording apparatus by including a drive control device and a recording head driven by a motor of the drive control device.

The present invention also relates to a method for controlling the driving of a motor, the method comprising: using motor control data including switching timing information of a phase signal indicating a driving direction of the motor; A drive control method is provided by including a step of generating the phase signal based on switching timing information.

The present invention also relates to a method for controlling the drive of a motor, wherein the motor control data is stored in storage means using motor control data including switching timing information of a phase signal indicating a drive direction of the motor. Driving, reading the stored motor control data, and generating the phase signal based on the switching timing information included in the read motor control data. A control method is provided.

Here, the phase signal can be generated by a gate array.

The operation by the register for setting the switching timing information of the phase signal and the operation by the gate array can be selectively controlled.

The motor control data is performed by serial command transfer, and the switching timing information includes:
The information related to the phase signal indicating the driving direction of the motor included in one transfer command may be replaced information.

The motor control data can be read by the DMA control circuit.

Further, according to the present invention, a recording operation can be performed on a recording medium by driving a recording head using the drive control method.

According to the present invention, there is provided a medium recording a program for controlling the drive of a motor by a computer using motor control data including switching timing information of a phase signal indicating a drive direction of the motor. The control program provides a recording medium on which a drive control program is recorded by causing a computer to generate the phase signal based on the switching timing information included in the motor control data.

According to the present invention, there is provided a medium recording a program for controlling the drive of a motor by a computer using motor control data including switching timing information of a phase signal indicating a drive direction of the motor. The control program causes a computer to store the motor control data in storage means, read the stored motor control data, and, based on the switching timing information included in the read motor control data, A recording medium on which a drive control program is recorded is provided by generating a signal.

[0041]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, a configuration example of a system according to the present invention will be described.

FIG. 1 shows the configuration of a recording apparatus applicable to the present invention.

Reference numeral 1 denotes a recording device.

Reference numeral 2 denotes a CPU that plays a central role in controlling the recording apparatus 1.

Reference numeral 3 denotes a ROM that stores a control program, CG, and the like according to the present invention.

Reference numeral 4 denotes a gate array (GA).
The features that cannot be fulfilled by the function of U2 are supplemented in the form of custom devices by logic design.

5 is a RAM. The RAM 5 includes a reception buffer for storing data (including print data, control codes, and symbols) transferred from the host device 100, a print buffer for reading data from the reception buffer and storing the data expanded into bit data, Gate array 4
It is used for the control register used in.

A carriage motor (CR motor) 6 moves the recording head 10 in the main scanning direction along the recording material.
It is.

Reference numeral 7 denotes a line feed motor (LF motor) for feeding paper in the recording material conveyance direction (sub-scanning direction).

Reference numeral 8 denotes a motor (ASF motor) used for sucking ink from the discharge nozzles of the recording head 10 and for feeding and discharging the paper in order to maintain print quality.

Reference numeral 9 denotes a motor driver necessary for driving each of the motors 6 to 8 and a motor drive circuit as a peripheral circuit thereof.

A recording head 10 is mounted on a carriage and performs recording by discharging ink along a recording material.

Reference numeral 11 denotes a head control circuit. The head control circuit 11 is configured to appropriately print the print head 10 by detecting a type of the print head 10, a variation in resistance for heating a heater in each ejection nozzle, a temperature, and the like. .

12 is a case where the user sets the power ON and the power O
This is an operation panel for actually operating FF, ONLINE, line feed (LF), and menu (setting of paper feeding method, used I / F, used cartridge, other functions, etc.).

Reference numeral 13 denotes a panel control circuit 12 for controlling the operation panel 12.

20 is the motor control data 3 from the RAM 5
This is a DMA control circuit that DMA-reads 0.

A host device 100 is connected to the recording device 1 via an interface (I / F).

The ROM 3 stores the CPU 2 and motor control data 30 for each of the motors 6 to 8. RA
Motor control data 30 of the motors 6 to 8 is stored in M5.

In this case, the motor control data 30 includes switching timing information in the motor drive current direction (PHASE signal).

(Overview of Processing of the Present Invention) Here, an overview of processing according to the present invention will be described.

When receiving a start trigger from the CPU 2, the gate array 4 reads the motor control data 30 stored in the RAM 5 by DMA, converts the read motor control data 30 into a parallel-serial data, and transfers it to the motor drive circuit 9. Is performed in one range. One step is formed by repeating the sequence 16 times.

Since the DMA handles one word of data at a time, one-step (16 range) driving requires one word.
Six DMAs are required (for the definition of one range and one step, refer to FIG. 7 described above).

(Specific Example) Hereinafter, the processing of the present invention will be described with reference to specific examples.

In the above-mentioned conventional example, since both the current value and the information on the motor drive current direction (PHASE signal) are to be handled together, complicated control is required.

In this embodiment, a control process for reducing the load on the CPU 2 is provided by automatically generating a phase (PHASE) signal based on the switching timing information.

In other words, the motor control data 30 is P
Means is provided which has switching timing information of the HASE signal, and a means for automatically generating the PHASE signal by the gate array 4 based on the switching timing information, thereby eliminating the conventional complicated control.

FIG. 2 shows an example of setting the motor control data 30.

In the data portion of the motor control data 30, the 15th and 8th bits should be P
HASE signal.

However, the present invention is characterized in that the fifteenth bit is used as an information bit for phase switching timing instead of the PHASE signal. Note that the eighth bit has no meaning at all. In addition, data of 4 bits to 7 bits is data of a B-phase signal,
Data of 11 bits to 14 bits is data of the A-phase signal.

An example of the operation of automatically generating (in this case, incrementing) the PHASE signal based on the switching timing information will be described below.

First, the CPU 2 sets the excitation start phase by register setting or the like. In the example of FIG.
The data at address 0000 is the data at the start of excitation.
Since the 15th bit switching timing information is set to “1”, the set excitation start phase is output to the motor drive circuit 9.

The gate array 4 sequentially increments the phase in accordance with the reciprocating signal from the set excitation start phase.

For example, when the excitation start phase is (A phase → 1, B phase →
0), when the reciprocating signal is forward, every time phase switching timing information is input, (A phase → 1, B phase → 1), (A phase →
The phases are incremented, for example, 0, B phase → 1), (A phase → 0, B phase → 0).

The excitation start phase is (A phase → 1, B phase →
0), when the reciprocating signal is restored, (A phase → 0, B phase → 0), (A phase →
The phases are incremented, for example, 0, B phase → 1), (A phase → 1, B phase → 1).

As described above, the phase switching timing is D
15 of motor control data 30 obtained by reading MA
This is the case where the bit is “1”, and the phases are sequentially switched as described above.

The next phase switching timing is as follows.
This is at the time of data at address 100008. Thus, the gate array 4 automatically increments (A phase → 1, B phase → 1). Similarly, the phase is incremented for each step.

FIG. 3 shows a phase signal that is incremented based on the motor control data of FIG. In FIG. 3, 1
FIG. 9 shows motor drive current directions (PHASE signal) in A-phase and B-phase phase signal waveforms and current value waveforms when the steps are changed in four stages (including 0) of current values.

The 15th bit switching timing information can be set in, for example, a register.

As described above, the motor control data 30 is stored in the RAM 5, the gate array 4 sequentially handles the motor control data 30 by DMA, and the phase signal is determined according to the bit (15th bit) in the actual data table. Is generated, so that the load on the CPU 2 can be further reduced.

The present invention can be applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, and a printer).
The present invention may be applied to an apparatus including two devices (for example, a copying machine and a facsimile machine).

Further, it is needless to say that the present invention can be applied to a case where the present invention is achieved by supplying a program to a system or an apparatus. Then, a storage medium storing a program represented by software for achieving the present invention is supplied to a system or an apparatus, and the computer (or CPU or M) of the system or the apparatus is supplied.
PU) can read and execute the program code stored in the storage medium, so that the effects of the present invention can be enjoyed.

In this case, the program code itself read from the storage medium implements the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.

Examples of the storage medium for supplying the program code include a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, and CD.
-R, magnetic tape, nonvolatile memory card, ROM
(A mask ROM, a flash EEPROM, or the like) can be used.

When the computer executes the readout program code, not only the functions of the above-described embodiment are realized, but also the OS (Operating System) running on the computer based on the instruction of the program code. ) May perform some or all of the actual processing, and the processing may realize the functions of the above-described embodiments.

Further, after the program code read from the storage medium is written into the memory provided in the function expansion port inserted into the computer or the function expansion unit connected to the computer, the program code is read based on the instructions of the program code. It goes without saying that the CPU included in the function expansion board or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

[0087]

As described above, according to the present invention,
The switching timing information of the motor drive current direction (phase signal) is incorporated in the motor control data in advance, and the phase signal is automatically generated according to the switching timing information. If it is, it is not necessary to consider complicated phase control in consideration of reciprocation as in the related art, whereby the load on the CPU can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a system configuration example of a recording apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing one example of control data including phase signal switching timing information in the present invention.

FIG. 3 is a waveform diagram showing a waveform of a phase signal in a case of an outward operation in which an excitation start phase is an A phase in the present invention.

FIG. 4 is a block diagram showing a conventional system configuration example for transferring control data.

FIG. 5 is a timing chart showing data transfer contents for one range to a motor driver.

FIG. 6 is an explanatory diagram showing a command system for transfer.

FIG. 7 is a waveform diagram showing a waveform of a motor drive current.

FIG. 8 is an explanatory diagram showing the contents of a table of control data when the excitation start phase is A-phase.

FIG. 9 is an explanatory diagram showing table contents of control data when the excitation start phase is a B phase.

[Explanation of symbols]

 Reference Signs List 1 recording device 2 CPU 3 ROM 4 gate array 5 RAM 6 to 8 motor 10 recording head 20 DMA control circuit 30 motor control data

Claims (15)

[Claims] An apparatus for controlling driving of a motor, comprising: motor control data including switching timing information of a phase signal indicating a driving direction of the motor; storage means for storing the motor control data; A drive control device comprising: a read unit that reads out the motor control data; and a generation unit that generates the phase signal based on the switching timing information included in the read motor control data. 2. The drive control device according to claim 1, wherein the generation unit has a gate array. 3. The apparatus according to claim 2, further comprising a register for setting the switching timing information of the phase signal, and a selection unit for selecting an operation by the register and an operation by the gate array. Drive control device. 4. The motor control data is performed by serial command transfer, and the switching timing information is information obtained by replacing information on a phase signal indicating a driving direction of the motor included in one transfer command. 4. The drive control device according to claim 1, wherein: 5. The drive control device according to claim 1, wherein said read means is a DMA control circuit. 6. A printing apparatus, comprising: the drive control device according to claim 1; and a print head driven by a motor of the drive control device. 7. A method for controlling driving of a motor, comprising: using motor control data including switching timing information of a phase signal indicating a driving direction of the motor, wherein the switching timing information included in the motor control data is used. A step of generating the phase signal based on the driving control method. 8. A method of controlling driving of a motor, comprising: using motor control data including switching timing information of a phase signal indicating a driving direction of the motor, and storing the motor control data in a storage unit; Reading the stored motor control data; and generating the phase signal based on the switching timing information included in the read motor control data. . 9. The drive control method according to claim 7, wherein the phase signal is generated by a gate array. 10. The drive control method according to claim 9, wherein an operation by a register that sets the switching timing information of the phase signal and an operation by the generation unit are selectively controlled. 11. The motor control data is performed by serial command transfer, and the switching timing information is information obtained by replacing information related to a phase signal indicating a driving direction of the motor included in one transfer command. The drive control method according to any one of claims 7 to 10, wherein: 12. The motor control data is read by a DMA control circuit.
2. The drive control method according to claim 1, 13. A recording method for performing a recording operation on a recording medium by driving a recording head using the drive control method according to claim 7. 14. A medium recording a program for performing drive control of a motor by a computer using motor control data including switching timing information of a phase signal indicating a drive direction of the motor, wherein the control program is a computer. A recording medium in which a drive control program is recorded, wherein the phase signal is generated based on the switching timing information included in the motor control data. 15. A medium storing a program for performing drive control of a motor by a computer using motor control data including switching timing information of a phase signal indicating a drive direction of the motor, wherein the control program is a computer. Storing the motor control data in a storage unit, reading the stored motor control data, and generating the phase signal based on the switching timing information included in the read motor control data. A recording medium on which a drive control program is recorded.