JPH09308293A - Multiphase motor control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiphase motor control apparatus to realize the stable rotating drive of a pulse motor through control of cariation of a motor torque by optimumly controlling an exciting current supplied to each phase at the single phase excitation and the double phase excitation on the occasion of driving a double phase structure pulse motor by the single phase and the double phase excitation methods. SOLUTION: In compactors COM1, COM2, a double phase excitation detection voltage and single phase excitation detection voltage inputted from excitation current detection resistors R4, R5 are compared with the double excitation reference voltage Vref2 and single phase excitation reference voltage Vref1 inputted by reference voltage setting transistor Tr1. On the basis of this comparison result, excitation transistors Tr2, Tr3 are driven and controlled to control the double phase excitation current and the single phase excitation current to the constant level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-phase motor control device, and more particularly to a multi-phase motor controller in which an exciting current is alternately applied to each of the plurality of exciting coils constituting the multi-phase motor. The present invention relates to a polyphase motor control device for driving and controlling a polyphase motor.

[0002]

2. Description of the Related Art Conventionally, as a multi-phase motor control device for driving and controlling a multi-phase motor composed of a plurality of exciting coils, for example, a table mounted on a cycle sewing machine and sandwiching a sewn product according to a sewing pattern is used. There is a pulse motor drive control circuit or the like for driving and controlling a pulse motor that moves the −Y coordinate plane. An example of this pulse motor drive control circuit is shown in FIG. This pulse motor drive control circuit 2
A two-phase stepping motor SM is connected to the 0 connection terminals X1 to X6.

The pulse motor drive control circuit 20 shown in FIG. 4 is an excitation drive for performing one-phase excitation and two-phase excitation based on a motor drive pulse signal CK and a motor rotation direction designating signal Dir input from a control unit (not shown). A pulse motor drive IC 21 that generates signals φA to φD, and an excitation drive signal φA that is generated by this pulse motor drive IC 21.
Drive driver Tr3 to Tr6 for driving the exciting coils A to D of the stepping motor SM having a two-phase structure by one-phase excitation and two-phase excitation, and the reference voltage Vref by dividing the power supply voltage V +. Dividing resistor R
1, R2, and a detection resistor R that detects an exciting current flowing through the drive transistors Tr3 to Tr6 and outputs a detection voltage corresponding to the exciting current to the comparators COM1 and COM2.
3 and R4, the transistors Tr1 and Tr based on the comparison result between the reference voltage Vref set by the voltage dividing resistors R1 and R2 and the detection voltage input by the detection resistors R3 and R4.
2 and the comparators COM1 and COM2 for controlling the excitation current to be constant, and this comparator COM.
1. An exciting transistor T which is driven and controlled by COM2 and supplies constant exciting currents IφA to IφD based on the power supply voltage VM to the exciting coils A to D of the stepping motor SM.
r1 and TR2.

FIG. 5 is a timing chart of the exciting currents IφA to IφD supplied to the exciting coils A to D of the stepping motor SM by the pulse motor drive control circuit 20.
Shown in As shown in FIGS. 5A to 5D, the excitation current Iφ generated by the pulse motor drive control circuit 20.
Excitation coils A to D of the stepping motor SM are driven by A to IφD by repeating one-phase excitation and two-phase excitation.

In this case, the comparators COM1 and COM
In FIG. 2, since the respective excitation currents at the time of one-phase excitation and at the time of two-phase excitation are set based on the reference voltage Vref set by the voltage dividing resistors R1 and R2, it is shown in FIGS. As described above, the current values of the exciting currents IφA to IφD are constant.

However, in this case, if the current values of the respective excitation currents IφA to IφD during the one-phase excitation and the two-phase excitation are set to be constant, the amount of the excitation current during the one-phase excitation becomes the excitation during the two-phase excitation. It is about ½ of the amount of current, and the motor torque during one-phase excitation is about 70 times the motor torque during two-phase excitation.
%, The driving torque is not constant, which causes vibration and noise, and the table movement cannot be performed stably, which causes a problem that the sewing operation becomes unstable.

As a pulse motor drive control circuit for solving such a problem, for example, there is a pulse motor drive control circuit 30 having a circuit configuration shown in FIG. At the connection terminals X1 to X6 of the pulse motor drive control circuit 30,
A stepping motor SM having a two-phase structure is connected.

The pulse motor drive control circuit 30 shown in FIG. 6 is an excitation drive for performing one-phase excitation and two-phase excitation based on a motor drive pulse signal CK and a motor rotation direction designation signal Dir which are input from a control unit (not shown). A pulse motor drive IC 31 that generates signals φA to φD, and an excitation drive signal φA that is generated by this pulse motor drive IC 31
.About..phi.D to detect the one-phase excitation time to drive the transistor Tr1 on / off, and a one-phase time detection circuit 32, and an excitation drive signal .phi.A to .phi.D generated by the pulse motor drive IC 31 to drive the two-phase structure. Drive transistors Tr3 to Tr6 for driving the excitation coils A to D of the stepping motor SM of one-phase excitation drive and two-phase excitation drive, and on / off drive by the one-phase detection circuit 32 to divide the voltage dividing resistor R2. Transistor Tr1 for setting reference voltage Vref in two ways by enabling / disabling R1 and R3
A detection resistor R4 for detecting an exciting current flowing through the drive transistors Tr3 to Tr6 and outputting a detection voltage corresponding to the exciting current to the comparator COM;
1. A comparator COM that controls the drive of the transistor Tr2 based on the comparison result between the reference voltage Vref set by 1 and the detection voltage input by the detection resistor R4 to control the exciting current amount to a constant value, and the drive control by the comparator COM. Excited current IφA based on the power supply voltage VM
To IφD are excitation coils A to D of the stepping motor SM
The exciting transistor TR2 is supplied to the.

FIG. 7 is a timing chart of the exciting currents IφA to IφD supplied to the exciting coils A to D of the stepping motor SM by the pulse motor drive control circuit 30.
Shown in As shown in FIGS. 7A to 7D, the excitation current Iφ generated by the pulse motor drive control circuit 30.
Excitation coils A to D of the stepping motor SM are driven by A to IφD by repeating one-phase excitation and two-phase excitation.

In this case, in the comparator COM, the exciting currents for the one-phase excitation and the two-phase excitation are set based on the reference voltage Vref set in two ways by the transistor Tr1 and the voltage dividing resistors R1 to R3. , FIG. 7 (a)
As shown by solid lines in (d) to (d), one-phase excitation currents IφA to I
Since the current value of φD is set higher than the current values of the two-phase excitation currents IφA to IφD, the fluctuation of the motor torque during the one-phase excitation and the two-phase excitation is reduced.

[0011]

However, in the conventional pulse motor drive control circuit 30 mounted on the cycle sewing machine shown in FIG. 6, the stepping motor SM is operated during one-phase excitation and two-phase excitation. Of the exciting currents IφA to IφD supplied to the respective phases of the comparator COM.
Then, since the control is performed collectively by comparison with the detection voltage detected by the detection resistor R4, FIG.
As indicated by the broken line in (d) to (d), the excitation currents flowing in the respective phases during the two-phase excitation become unbalanced, the motor torque fluctuates during the two-phase excitation, and the drive torque is not constant. However, this also causes vibration and noise, and a problem that the stable table movement cannot be performed and the sewing operation becomes unstable.

An object of the present invention is to optimally control the exciting current supplied to each phase during one-phase excitation and two-phase excitation when the two-phase pulse motor is driven by one-phase excitation and two-phase excitation. By doing so, it is possible to provide a multi-phase motor control device that suppresses fluctuations in motor torque and realizes stable rotational driving of a pulse motor.

[0013]

According to the first aspect of the present invention,
An excitation current is applied to each of the plurality of exciting coils constituting the multi-phase motor for each phase and every two phases, and the one-phase excitation and the two-phase excitation of the plurality of exciting coils are repeated to control the drive of the multi-phase motor. In the multi-phase motor control device, an excitation timing detection means for detecting switching timing of one-phase excitation and two-phase excitation of the excitation coil, and one-phase excitation timing and two-phase excitation timing detected by the excitation timing detection means Excitation current setting means for setting one-phase excitation current and two-phase excitation current, one-phase current detection means for detecting the excitation current flowing in the excitation coil for one phase at the time of the one-phase excitation, and at the two-phase excitation The two-phase current detecting means for detecting the exciting current flowing through the exciting coil for two phases, the one-phase exciting current value detected by the one-phase current detecting means and the two-phase current detecting means Ri based on two-phase excitation current to be detected, is characterized in that it comprises a, an excitation current adjustment means for adjusting the single-phase excitation current amount and the two-phase excitation current amount said.

According to the multi-phase motor control device of the present invention, an exciting current is applied to each of the plural exciting coils constituting the multi-phase motor for each phase and every two phases, and the plural exciting coils are applied. Repeating one-phase excitation and two-phase excitation, in the multi-phase motor control device for driving and controlling the multi-phase motor, the switching timing of the one-phase excitation and the two-phase excitation of the exciting coil is detected by the excitation timing detection means, The one-phase excitation current and the two-phase excitation current are set by the excitation current setting means in accordance with the one-phase excitation timing and the two-phase excitation timing detected by the excitation timing detection means, and the excitation for one phase is performed during the one-phase excitation. The exciting current flowing through the coil is detected by the one-phase current detecting means, and the exciting current flowing through the exciting coil for two phases during the two-phase excitation is detected by the two-phase current detecting means. That when, by the exciting current adjustment unit, based on the single-phase excitation current value and the two-phase excitation current is detected by the respective detection means, one phase excitation current amount and the two-phase excitation current amount the is adjusted.

Therefore, the one-phase exciting current and the two-phase exciting current can be controlled so as to keep the driving torque of the multi-phase motor constant, and the generation of vibration and noise during driving of the multi-phase motor can be suppressed. . As a result, it is possible to realize stable motor drive in a device equipped with a polyphase motor, stabilize the operation involving the polyphase motor in the device, and improve the reliability of the device.

[0016]

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

1 to 3 are views showing an embodiment to which the present invention is applied.

First, the configuration will be described.

FIG. 1 shows a cycle sewing machine 1 according to this embodiment.
3 is a diagram showing a block configuration of a control system of FIG.

In FIG. 3, the control system of the cycle sewing machine 1 includes a system ROM 2, a data ROM 3, and a RAM.
4, CPU 5, interface (I / F) 6, operation panel 7, pulse motor driver 8, X movement pulse motor 9, Y movement pulse motor 10, upper axis motor driver 11, upper axis servo motor 12, X position detection. Sensor 13,
It is composed of a Y position detection sensor 14 and an upper shaft sensor 15.

System ROM (Read Only Memory) 2
Stores a sewing operation control program for controlling the sewing operation of the cycle sewing machine 1. The data ROM 3 stores a plurality of sewing pattern data as pattern No. The pattern No. is stored in association with the sewing pattern, and the X-direction enlargement / reduction ratio and the Y-direction enlargement / reduction ratio of the sewing pattern and the sewing speed are stored as sewing data. It stores a sewing data table that is stored in association with.

A RAM (Random Access Memory) 4 is
When the CPU 5 executes the sewing operation control processing program, it forms a memory area in which various data required for sewing are temporarily expanded.

CPU (Central Processing Unit) 5
Reads various data (sewing pattern data, enlargement / reduction rate data, etc.) necessary for sewing operation from the data ROM 3 based on various operation information input from the operation panel 7 through the interface 6 and expands it in the RAM 4 Control of the sewing operation is started by a start signal input from the operation panel 7 via 6, and the system RO
According to the sewing operation control program stored in M2, the pulse motor driver 8 and the upper shaft motor driver 11 are controlled via the interface 6 to control the sewing operation of the cycle sewing machine 1.

The interface 6 includes an operation panel 7 and the like.
Each input signal input from the start switch, presser switch, pause switch, etc., X position detection sensor 13,
Each detection signal input from the Y position detection sensor 14 and the upper shaft sensor 15 is converted into a predetermined voltage level and output to the CPU 5, and various control signals input from the CPU 5 are converted into a predetermined signal form and pulsed. Motor driver 8
And to the upper shaft motor driver 11.

The pulse motor driver 8 is composed of the circuit shown in FIG. 2. This FIG. 2 shows an X side motor drive control circuit for driving and controlling the pulse motor 9 for X movement. The circuit configuration of the Y-side motor drive control circuit that drives and controls 10 is also the same, and its illustration is omitted.

The pulse motor driver 8 of FIG. 2 constitutes the multi-phase motor control device of the present invention, and includes a pulse motor drive IC 81, a one-phase detection circuit 82, driving transistors Tr4 to Tr7, and a reference voltage setting transistor Tr.
1 and comparators COM1 and COM2, exciting transistors Tr2 and Tr3, voltage dividing resistors R1 to R3 and exciting current detecting resistors R4 and R5, and an X movement pulse motor 9 is connected to the connection terminals X1 to X6. It is connected.

The pulse motor drive IC 81 has a motor drive pulse signal CK and a motor rotation direction designation signal Di which are input from the CPU 5 of FIG.
Excitation drive signal φ for one-phase excitation and two-phase excitation based on r
A to φD are generated to drive transistors Tr4 to Tr7
Is turned on / off.

The drive transistors Tr4 to Tr7 are turned on / off at the timings of the excitation drive signals φA to φD generated by the pulse motor drive IC 81, and each excitation coil A of the X movement pulse motor 9 of the two-phase structure. One-phase excitation drive and two-phase excitation drive of D are performed.

The one-phase detection circuit 82, which constitutes the excitation timing detection means of the present invention, is a pulse motor drive I.
The reference voltage setting transistor Tr1 is detected by detecting the one-phase excitation from the excitation drive signals φA to φD generated by C81.
Is turned on / off.

Next, the exciting current setting means of the present invention comprises a reference voltage setting transistor Tr1 and voltage dividing resistors R1, R2.
Reference voltage setting transistor Tr1 which is composed of R3
Is ON / OFF driven by the one-phase detection circuit 32,
The reference voltage Vref is set in two ways by enabling / disabling the voltage dividing resistor R2 with respect to the voltage dividing resistors R1 and R3. That is,
The reference voltage setting transistor Tr1 is turned off during the two-phase excitation to set the reference voltage Vref1 obtained by dividing the power supply voltage V + by the voltage dividing resistors R1 to R3, and is turned on during the one-phase excitation to divide the power supply voltage V +. Reference voltage Vr divided by piezoresistors R1 and R3
Set ef2.

The reference voltage setting transistor T
The reference voltage setting ratio when r1 is off / on is the reference voltage V
ref1: reference voltage Vref2 = 1: 1.4 (√2),
The resistance values of the voltage dividing resistors R1 to R3 are set so that

The detection resistors R4 and R5 separately detect the one-phase exciting current and the two-phase exciting current flowing in the driving transistors Tr4 to Tr7 by the voltage generated at both ends, and use them as the one-phase exciting current and the two-phase exciting current. The corresponding detected voltage is output to the comparators COM1 and COM2.

Then, at the time of one-phase excitation, the detection resistor R4
The one-phase excitation detecting means of the present invention is configured by detecting the current flowing in one of R5, and the two-phase of the present invention is detected by detecting the current flowing in both the detection resistors R4 and R5 during the two-phase excitation. Excitation detecting means is configured.

The comparators COM1 and COM2 include a reference voltage setting transistor Tr1 and voltage dividing resistors R1 to R3.
The reference voltages Vref1 and Vref2 set by
The excitation transistor T is based on the result of comparison between the detection voltages of the one-phase excitation and the two-phase excitation input by the detection resistor R4.
Drive control of r2 and Tr3 is performed to control each exciting current amount flowing in each exciting coil A to D of the X movement pulse motor 9 at the time of one-phase excitation and two-phase excitation to be constant, thereby adjusting the exciting current of the present invention. Constitutes a means.

The X movement pulse motor 9 of FIG. 1 has two-phase exciting coils A to D, and one-phase excitation and two-phase excitation are driven by the X-side motor drive control circuit of the pulse motor driver 8 shown in FIG. The sewing machine is rotationally driven by the control to move the sewing table (not shown) in the X direction according to the sewing pattern.

The Y-moving pulse motor 10 has two-phase exciting coils A to D, and is controlled by a Y-side motor drive control circuit having the same configuration as the X-side motor drive control circuit of the pulse motor driver 8 shown in FIG. It is rotationally driven by the phase excitation and two-phase excitation drive control, and moves the sewing table (not shown) in the Y direction according to the sewing pattern.

The upper shaft motor driver 11 drives and controls the upper shaft servo motor 12 according to a control signal input from the CPU 5 via the interface 6, and an upper shaft (not shown) housed in a sewing machine main body (not shown). Is driven to rotate, and a needle bar (not shown) driven via its upper shaft and a predetermined transmission mechanism (not shown) is driven with a predetermined stroke.

The X position detection sensor 13 detects the amount of movement of the sewing table in the X direction, which is moved by the X movement pulse motor 9, and outputs the X position detection signal to the interface 6.
To the CPU 5 via.

The Y position detection sensor 14 detects the amount of movement of the sewing table moved by the Y movement pulse motor 10 in the Y direction, and outputs the Y position detection signal to the CPU 5 via the interface 6.

The upper axis sensor 15 is the upper axis servo motor 12
A rotation angle detection signal corresponding to the rotation angle when the is rotated is output to the CPU 5 via the interface 6.

Next, the operation of this embodiment will be described.

In the cycle sewing machine 1 of FIG. 1, the power is turned on by operating the power switch on the operation panel 7,
When the sewing pattern stored in the data ROM 3 is selected by the sewing pattern selecting operation and the sewing product is set on the sewing table and the presser foot switch is operated, the sewing product set on the sewing table is pressed. The sewing operation is started in accordance with the selected sewing pattern data by operating the start switch with the pinching by.

The circuit operation in the X side motor drive control circuit in FIG. 2 in the pulse motor driver 8 in this sewing operation will be described below.

In the X side motor drive control circuit of FIG. 2, first, the pulse motor drive IC 81 is connected to the CPU 5 of FIG.
Excitation signals φA to φD for one-phase excitation and two-phase excitation based on the motor drive pulse signal CK and the motor rotation direction designation signal Dir input from the interface 6 through the interface 6.
Is generated and the driving transistors Tr4 to Tr7 are driven on / off. In the one-phase detection circuit 82, the excitation drive signal φ generated by the pulse motor drive IC 81
When one-phase excitation is detected from A to φD, the reference voltage setting transistor Tr1 is driven on / off.

In the reference voltage setting transistor Tr1,
It is turned on / off by the one-phase detection circuit 32 to enable / disable the voltage dividing resistor R2 with respect to the voltage dividing resistors R1 and R3, that is, it is turned off during two-phase excitation to enable the voltage dividing resistor R2. Then, the reference voltage Vref1 obtained by dividing the power source voltage V + by the voltage dividing resistors R1 to R3 is set, and it is turned on during the one-phase excitation to invalidate the voltage dividing resistor R2, and the power source voltage V + is divided by the voltage dividing resistor R1.
The reference voltage Vref2 divided by 1 and R3 is set to the non-inverting terminals (+) of the comparators COM1 and COM2.

Then, the comparators COM1 and COM2
Then, the excitation transistors Tr1 and Tr2 are driven by the reference voltage Vref1 set during the one-phase excitation by the reference voltage setting transistor Tr1 or the reference voltage Vref2 set during the two-phase excitation. In the exciting transistors Tr1 and Tr2, comparators COM1 and CO are provided.
When an ON signal based on the reference voltage Vref2 for two-phase excitation is input from M2, an excitation current for two-phase excitation based on the power supply voltage VM is set, and the pulse motor for X movement is connected via the connection terminals X1 and X2. When an ON signal based on the reference voltage Vref1 for one-phase excitation is input from the comparators COM1 and COM2, the excitation current for one-phase excitation based on the power supply voltage VM is set. And is applied to each exciting coil A to D of the X movement pulse motor 9 via the connection terminals X1 and X2.

Then, the exciting transistor Tr1,
Each exciting coil A of the pulse motor 9 for X movement by Tr2
The excitation currents for two-phase excitation and the excitation currents for one-phase excitation applied to D to D are detected by the excitation current detection resistors R4 and R5 via the connection terminals X3 to X6. That is, at the time of two-phase excitation, the detection voltage based on the exciting current flowing through both the exciting current detecting resistors R4 and R5 becomes the comparators COM1 and CO.
The output voltage is output to each inverting terminal (−) of M2, and at the time of one-phase excitation, the detection voltage based on the excitation current flowing through one of the excitation current detection resistors R4 and R5 is detected by comparators COM1 and COM2.
Is output to each inverting terminal (-).

In the comparators COM1 and COM2, the two-phase excitation detection voltage and the one-phase excitation current detection voltage input from the excitation current detection resistors R4 and R5, and the two-phase excitation reference voltage input from the reference voltage setting transistor Tr1. The voltage Vref2 and the one-phase excitation reference voltage Vref1 are compared, and the excitation transistor Tr is based on the comparison result.
2, Tr3 is drive-controlled, and the two-phase excitation excitation current and the one-phase excitation excitation current are controlled to be constant.

By the above-described one-phase excitation and two-phase excitation drive control in the X-side motor drive control circuit, the two-phase excitation current and the one-phase excitation applied to the respective excitation coils A to D of the pulse motor 9 for X movement. Exciting current and one-phase detection circuit 82
FIG. 3 shows the relationship between the one-phase detection signal output from the device and on / off of the reference voltage setting transistor Tr1.

In FIG. 3, (a) to (d) show changes in the two-phase exciting currents and the one-phase exciting currents IφA to IφD applied to the exciting coils A to D. (E) shows the relationship between the one-phase detection signal output from the one-phase detection circuit 82 and on / off of the reference voltage setting transistor Tr1.

As shown in FIG. 3, the one-phase detection signal and the reference voltage setting transistor Tr1 are applied to the exciting coils A to D of the pulse motor 9 for X movement in synchronization with the on / off timing. The relationship between the two-phase excitation excitation current and the one-phase excitation excitation current is maintained at 1: 1.4 according to the ratio between the two-phase excitation reference voltage Vref2 and the one-phase excitation reference voltage Vref1.

The above-described drive control contents of the X movement pulse motor 9 by the X side motor drive control circuit are similarly applied to the drive control of the Y movement pulse motor 10 by the Y side motor drive control circuit.

Therefore, the pulse motor driver 8 causes the X movement pulse motor 9 and the Y movement pulse motor 1 to operate.
When 0 is driven by one-phase excitation and two-phase excitation, the ratio of the one-phase excitation current and the two-phase excitation current applied to the excitation coils A to D is set to "1: 1.4". Therefore, the ratio of each motor torque when driven by the excitation current of each phase is “1:
The driving torque for moving the sewing table can be kept constant to suppress the generation of vibration and noise, and the stable movement of the sewing table can be realized, so that the sewing operation of the cycle sewing machine 1 can be performed. Can be stabilized.

As a result, the pulse motor driver 8 drives and controls the X movement pulse motor 9 and the Y movement pulse motor 10 to improve the reliability of the cycle sewing machine 1 for controlling the movement of the sewing table. .

Although the one-phase detection circuit 82 detects the one-phase excitation timing in the above embodiment, the excitation drive signals φA to φD output from the pulse motor drive IC 81 are transmitted via the interface 6. CP
Alternatively, the CPU 5 may monitor and output the one-phase detection signal from the CPU 5 to the pulse motor driver 8.

In this case, the circuit configuration of the pulse motor driver 8 can be simplified and the cost of the pulse motor driver 8 can be reduced.

In the above embodiment, the case where the multi-phase motor control device of the present invention is applied to the cycle sewing machine has been described. However, the present invention is not limited to this, and a two-phase motor is mounted to excite one- and two-phase excitation. Of course, the multi-phase motor control device of the present invention can be applied to other driven devices.

[0058]

According to the multi-phase motor control device of the present invention, the one-phase exciting current and the two-phase exciting current can be controlled so that the driving torque of the multi-phase motor is kept constant.
It is possible to suppress the generation of vibration and noise when driving the multi-phase motor. As a result, it is possible to realize stable motor drive in a device equipped with a polyphase motor, stabilize the operation involving the polyphase motor in the device, and improve the reliability of the device.

[Brief description of drawings]

FIG. 1 is a diagram showing a block configuration of a control system of a cycle sewing machine according to an embodiment of the present invention.

FIG. 2 is a diagram showing a circuit configuration in the pulse motor driver of FIG.

FIG. 3 is a diagram showing a timing chart of an exciting current output by the pulse motor drive control circuit of FIG.

FIG. 4 is a diagram showing a circuit configuration of a pulse motor drive control circuit mounted on a conventional cycle sewing machine.

5 is a diagram showing a timing chart of an exciting current output by the pulse motor drive control circuit of FIG.

FIG. 6 is a diagram showing a circuit configuration of another pulse motor drive control circuit mounted on a conventional cycle sewing machine.

7 is a diagram showing a timing chart of the exciting current output by the pulse motor drive control circuit of FIG.

[Explanation of symbols]

 1 cycle sewing machine 2 system ROM 3 data ROM 4 RAM 5 CPU 6 interface 7 operation panel 8 pulse motor driver 9 X movement pulse motor 10 Y movement pulse motor 11 upper axis motor driver 12 upper axis servo motor 13 X position detection sensor 14 Y position detection sensor 15 Upper axis sensor 81 Pulse motor drive IC 82 One-phase detection circuit Tr1 Reference voltage setting transistors Tr2, Tr3 Excitation transistors Tr4 to Tr7 Driving transistors COM1 and COM2 Comparator R1 to R3 Voltage dividing resistors R4 and R5 Exciting current detection resistor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Suzuki 1 at 2-2, Kokuryo-cho, Chofu-shi, Tokyo Inside Juke Co., Ltd.

Claims (1)

[Claims] 1. A multi-phase motor, wherein an exciting current is applied to each phase and two phases of a plurality of exciting coils, and the one-phase excitation and the two-phase excitation of the plurality of exciting coils are repeated to obtain the multi-phase. In a multi-phase motor control device for driving and controlling a motor, excitation timing detection means for detecting switching timing of one-phase excitation and two-phase excitation of the excitation coil, and one-phase excitation timing and two-phase excitation timing detected by the excitation timing detection means. Excitation current setting means for setting one-phase excitation current and two-phase excitation current according to phase excitation timing, and one-phase current detection means for detecting the excitation current flowing in the excitation coil for one phase during the one-phase excitation, Two-phase current detecting means for detecting an exciting current flowing through the exciting coil for two phases during the two-phase excitation, a one-phase exciting current value detected by the one-phase current detecting means, and Multi-phase motor control, comprising: excitation current adjusting means for adjusting the one-phase excitation current amount and the two-phase excitation current amount based on the two-phase excitation current detected by the current detection means. apparatus.