JPS60190198A - Drive circuit of stepping motor - Google Patents

Abstract

PURPOSE:To decrease the numbers of components such as IC elements, transistors and output terminals of output ports by selectively controlling a current flowed to the exciting phases of stepping motors by a common circuit. CONSTITUTION:When the first stepping motor is driven, a signal for selecting the motor is output from the output terminal Z01 of the output port 11, a motor drive signal which has H and L levels is output from the output terminals XO, YO of the port 11 to sequentially conduct transistors 15a, 15b, 15c, 15d. As a result, exciting currents are supplied from a power source terminal 12 for the motor of a DC power source to the exciting phases A1, B1, C1, D1 of the first stepping motor, and the motor is rotated. When the motor is finished to drive, a control signal is output from the output terminal Z02, and the second stepping motor is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a stepping motor drive circuit that drives a plurality of stepping motors.

[Technical background of Somei]

A drive circuit for driving a plurality of stepping motors having the same configuration is configured as shown in FIG. 1, for example, when the excitation method of the stepping motors is a two-phase excitation calm method.

That is, in the figure, 1 is an output port connected to an external computer, etc., and this output port 1 has four excitation phases kl, Bl, CI of the first stepping motor.

In order to prevent the temperature of output terminals XI, Yl specifying the DI phase and the stepping motor from rising, each excitation phase A1. B
An output terminal Zl is provided for outputting a signal for controlling energization to 1, CI, and DI. In the figure, 2 is a motor power supply terminal of a DC power supply (not shown) that supplies excitation current to each excitation phase of the stepping motor, and the motor power supply terminal 2 is connected between the emitter and collector of a PNP type transistor 3. The excitation phase of the stepping motor A1. B1. C
It is commonly connected to one end of I and DI. Each excitation phase A1'
, BJ, C7, and DJ are each diode 4a.
, 4b, 4c.

4d in the forward direction to NPN type Tran Nosta 5a,
5b, 5c, and 5d, and further transistors 5a, 5b, and 5c.

Each emitter of 5d is grounded. The base of the transistor 3 is connected to a drive circuit 7 composed of a resistor 6 and an IC.
It is connected to the output terminal z1 of the output port 1 via a resistor 6a, and a resistor 6a is inserted between the pace emitter. The output terminal X1 of the output port 1 is connected to the transistor 5 via a drive circuit 8a composed of an IC and a resistor 9a.
It is connected to the base of the trans-zoster 5b via a drive circuit 8b composed of an inverter IC and a resistor 9b. Each transistor 5
A resistor 10a between the pace emitters a and 5b, respectively.
10b is inserted. Similarly, the output terminal Yl is connected to the bases of transistors 5c and 5d via drive circuits Be and 8d and resistors 9c and 9d, respectively, and a resistor 10 is connected between the base and emitter of each transistor 5c and 5d.
c, 10d is inserted.

Also, the output yIe-to1 is the excitation phase A2. of the second stepping motor. B2. Output terminals X 2 and Y 2 L- for specifying C2 and D2, and an output terminal z2 for preventing temperature rise of the second step and ping motor are provided. Then, each of these output terminals X2. Y2. Z2
A circuit having the same configuration as that of the first step and the ping motor described above is connected to.

In the stepping motor drive circuit configured in this way, when driving the first stepping motor, the second stepping motor is
As shown in the figure, the output terminal Z of the output port 1 is set to the L level to make the transistor 3 conductive. In addition, the output terminals X1 and Y are synchronized with the step signal input from the outside.
By changing the combination of the output level with the transistor 5a
15b15c15d are made conductive in sequence.

As a result, each excitation A1 . B
1. An exciting current is sequentially supplied to CI and DI from the motor power terminal 2 of the DC power supply, and the stepping motor rotates. On the other hand, for the second stepping motor, output terminal z2 is similarly set to L level, and output terminal X2. By changing the combination of output levels of Y2, each excitation phase A2゜B2
．． The stepping motor rotates because the excitation current is sequentially supplied to C2. When stopping the stepping motor, the output terminals Zl and Z2 of output port 1
change to H level. As a result, the transistor 3 is cut off, and energization to each excitation phase is cut off.

[Problems with background technology]

However, the stepping motor drive circuit configured as described above has the following problems.

That is, in order to drive and control the above-mentioned two-phase excitation type stepping motor, two output terminals for sending motor rotation drive signals are required for one stepping motor, as shown in FIG. There are a total of three output terminals, Xi, Yl, and an output terminal z1 for preventing temperature rise.

In addition, transistors 5a to 5 for specifying each excitation phase are also provided.
Four d are required, transistor 3 for temperature rise prevention.
] pieces are required. Furthermore, each transistor 3, 5a~
Five IC elements are required as a drive circuit for driving 5d. Therefore, the number of the above-mentioned structural members is required to be equal to the number of stepping motors to be installed. As a result, in an apparatus in which a plurality of stepping motors having substantially the same configuration are installed, there is a problem that the number of component parts increases7, which not only increases the size of the apparatus but also increases the manufacturing cost.

[Purpose of the invention]

The present invention was made based on the above circumstances, and an object of the present invention is to selectively control the current flowing through each excitation phase of each stepping motor using a common circuit. It is an object of the present invention to provide a stepping motor drive circuit that can reduce the number of component parts such as transistors and the number of output terminals of an output boat, simplify the circuit configuration, and reduce manufacturing costs.

[Summary of the invention]

The present invention includes a plurality of first switching circuits inserted in each energizing path of the DC power source to each stepping motor, and a plurality of first switching circuits inserted in the energizing path of the DC power source to the stepping motor,
A plurality of second switching circuits are provided, one end of which is commonly connected to one end of each excitation phase for each excitation phase across all the stepping motors. Then, the control section sends a closing signal to the switching circuit of the driving box 1 for each stepping motor, and sequentially sends a motor rotation drive signal to the second switching circuit.

[Embodiments of the invention]

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

FIG. 3 is a circuit diagram showing a driving circuit for a stepping motor according to an embodiment. In the figure, 11 is an output port as a control unit connected to an external computer, etc., and this output yJ
The e-t 11 contains excitation phases ALBl, CI, DI and A, ? of the first and second stepping motors. , B
2. Output terminal XO that commonly specifies the phases of C2, D, and ';
To selectively drive YO and each stepping motor,
Each excitation phase A7-DJ, A, ? - Output terminal ZOI that outputs a closing signal that controls energization to D2.

Z02 is provided. 12 in the figure is a DC motor power supply terminal (not shown), and the motor power supply terminal 12 is connected to the first step via the emitter-collector of a transistor 13 as a first switching circuit. , are commonly connected to one end of the excitation phases AJ, Bl, CI, and DI of the ping motor. Each excitation phase A 1 , B 1
+' CI.

The other end of DI is a diode I 4 a, 14b, 14
c.

14d to the collectors of transistors 15a, 15b, 15c, and 15d as a second switching circuit;
Each emitter of 15c is grounded. The motor power supply terminal 12 is connected to the excitation phase of the second stepping motor via the emitter-collector of a transistor 16 as a first switching circuit. B2° is commonly connected to one end of C2 and D2. And each excitation phase A2. B2
．． The other ends of C2 and D2 are commonly connected to the respective excitation phases to the respective collectors of the transistors 15a, 15b, 15c, and 15d via diodes 17a, 17b, 17c, and 17d, similarly to the first stepping motor. Each pace of transistor 13.16 is connected to resistor 18.19 and I
It is connected to the output terminals ZOI and ZO2 of the output boat IJ through a drive circuit 20.21 composed of C, and a resistor 22.23 is connected between the pace and emitter of the output boat IJ.
is inserted. Also, output terminal X of output port 11
O is a drive circuit 24a made up of an IC, and D is a resistor 2.
The drive circuit 24b is connected to the pace of the transistor 15m via the s a and is configured with an inverter IC.
and is connected to the pace of transistor 15b via resistor 25b. Resistors 26a and 26 are connected between the pace emitters of each transistor 15m and 15b, respectively.
b is connected. Similarly, the output terminal YO is the drive circuit 2.
4c, 24d and resistors 25'c, 25d, respectively, to the paces of transistors 15c, 15d, and resistors 26c, 26d are interposed between the emitter and base of each transistor 15c, 15d.

In the stepping motor drive circuit having such a configuration, each output terminal ZOI of the output boat 1 is used to drive each stepping motor.

2θ2. The output signal levels of XO, , YO are shown in FIG. When driving the first stepping motor, first,
The output levels of the output terminals XO and YO are set so as to excite the excitation phase in the final state when the first step motor was last driven. Thereafter, the motor selection signal output from the output terminal ZOI is changed to L level, and the rotor position of the first stepping motor is set by the combination of the output levels of the output terminals XO and YO. Pull into the excitation phase position.

Thereafter, a motor drive signal consisting of a combination signal of H level and L level is outputted from the output terminals XO and Yθ of the output port 11 in synchronization with the step signal inputted from the outside, and the transistor 15a.

15b and 15c are made conductive in sequence. As a result, each excitation phase A 1 , BJ of the first stepping motor.

Excitation current is supplied to CI and DJ from the motor power terminal 12 of the DC power supply, and the first stepping motor starts rotating.

Therefore, in order to stop the first stepping motor, the output level of the output terminal ZOI may be changed to H level. In FIG. 4, the rotor stops after rotating for six excitation phases.

When the driving of the first stepping motor is completed, as shown in FIG. Drive the stepping motor.

In this way, the first. Since the second two stepping motors are selectively driven by the motor drive signal output from the output terminal X02YO of the output port 11, an output terminal is provided for each stepping motor as in the conventional device shown in FIG. unnecessary. As a result, not only the number of output terminals mentioned above but also the number of transistors that control energization to each excitation phase.
The number of IC elements installed as the drive circuits 248-24d of 5a-15d and the number of transistors 1, 5a-15d installed as the second switching circuits can also be reduced. In the example, compared with the conventional example shown in FIG.
The number of output terminals of one output boat can be reduced by 2, the number of transistors used can be reduced by 4, and the number of ICs installed accordingly can be reduced by 4.

Therefore, the number of components of the entire circuit can be reduced, the circuit can be simplified, and manufacturing costs can be significantly reduced.

Note that the present invention is not limited to the nine embodiments described above. In the embodiment, two stepping motors are used, but the number of stepping motors used is not limited, and if the total number of installed stepping motors is increased, the effect of the invention will further increase as shown in FIG. In other words, FIG. 5(a) shows Ste.
It shows the relationship between the number of installed stepping motors and the number of output terminals of the output port, and Figure 5 (b) also shows the relationship between the number of installed stepping motors and the number of transistors and IC elements installed. It is.

As is clear from these figures, the number of installations in the embodiment shown by the solid line is significantly reduced compared to the number of installations in the conventional example shown by the broken line.

〔Effect of the invention〕

As described above, according to the present invention, the rotation drive excitation current flowing through each excitation phase of each stepping motor is selectively controlled using a common circuit.

Therefore, it is possible to reduce the number of components such as IC elements and transistors, and the number of output terminals of the output board as a control section, simplifying the circuit configuration and reducing manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a drive circuit for a conventional steering wheel and ping motor, FIG. 2 is a time chart showing the operation of the drive circuit in FIG. 1, and FIG. Figure 5 is a circuit diagram showing the drive circuit of the ping motor, Figure 4 is a time chart showing the operation of the drive circuit in Figure 3, and Figure 5 is a diagram to explain the effect of the drive circuit. J, ll ・Output port (control unit), 2, 12...Motor power supply terminal 1. ? , l,? , 16...transistor (first switching circuit), 5a. 5 b + , 5 c + 5 d r 15 a +
15 b + 15 c + 15 d...transistor (second switching circuit), 20, 21.24n,
24b, 24c. 24d...Drive circuit (IC element), Al, A2゜Bl
, B2. CI, C2, DI, , D2...excitation phase, XI,
XI, X2. YO, Yl, Y2-...output terminal, Z
7, Z2, Z'OJ, ZO2- output terminal. (a) Motor 2 and 5 diagrams (b) Thousand-tabe support

Claims (1)

[Claims] a DC power supply that supplies excitation current to a plurality of stepping motors each having a plurality of excitation phases; a plurality of first switching circuits inserted in each energizing path of the DC power supply to each of the stepping motors; a plurality of second switching circuits that are inserted in a current-carrying path of a power source to the stepping motor, and one end of which is commonly connected to one end of each excitation phase for each excitation phase across all the stepping motors; A step and a pin comprising: a control section that sends a closing signal to each of the first switching circuits while driving the motor, and sequentially sends a motor rotation drive signal to the second switching circuit. Motor drive circuit.