JPH0928095A - Stepping motor drive controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of the construction of a stepping motor drive controller which has a circuit structure corresponding to an employed power supply by a method wherein switching devices are controlled in accordance with rotation instruction signals and a plurality of coils are connected to the power supply in series in a required direction to generate a required magnetic field. SOLUTION: A controller 22 controls transistors 10-21 time-sequentially in accordance with inputted rotation instruction signals and coils 1-3 are connected to a power supply 6 in series in a required direction and controls a stator in accordance with the magnetic poles produced in the coils 1-3 and turns a rotor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step motor drive control device.

[0002]

2. Description of the Related Art Conventionally, as a step motor drive control device for driving a pointer used in, for example, a reference timepiece for a broadcasting station, a structure as shown in FIG. 11 has been adopted.

To explain FIG. 11 concretely, a plurality of coils 111 for controlling the rotation of the step motor are connected to a power source 112.
In parallel, the coil 111 is supplied with an electric current in a desired direction to generate a predetermined magnetic field, and the rotor 113 of the step motor is rotated based on the magnetic field.

[0004]

Generally, a power supply has an allowable voltage and an allowable current, and a circuit driven by the power supply is designed in accordance with the allowable voltage and the allowable current of the power supply. When the coils 111 are connected in parallel as described above,
In order to actually suppress the current flowing in the entire circuit to the allowable current of the power source or less, the resistance of the coil must be increased. That is, in order to reduce the current actually flowing through the entire circuit having the coil, it was necessary to increase the number of turns of the coil. Therefore, there is a problem in that the outer shape of the coil becomes large and the structure cannot be downsized.

An object of the present invention is to reduce the size of a step motor drive control device having a circuit structure corresponding to a power source used.

[0006]

The present invention relates to a step motor having a plurality of coils each of which can be connected in series in a desired direction by a plurality of switch elements, and a rotor having a plurality of magnetic poles, and the rotation of the step motor. In response to a rotation instruction signal for instructing an operation, the switch element is controlled to connect the plurality of coils in series in a desired direction with respect to a power source to generate a desired magnetic field in each of the plurality of coils, The above object is achieved by providing a control means for controlling the rotating operation of the rotor.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below based on an embodiment shown in the drawings.

In FIG. 1, 1 to 3 are coils which generate magnetic poles in stators 6 to 8 which are arranged in the step motor 4 so as to surround the rotor 5 as shown in FIG. The coil 1 generates magnetic poles in the stator 6, and the coils 2 and 3 generate magnetic poles in the stators 6 and 7, respectively. The rotor 5 has two magnetic poles and rotates a pointer (not shown) via a train wheel (not shown).

Returning to FIG. 1, reference numeral 9 is a power source, and 10 to 21 are transistors forming switch elements. Reference numeral 22 denotes a control circuit which constitutes a control means, and is composed of a CPU, a ROM, a RAM, etc., designated by a hand movement mode designating device (not shown), and the transistors 10 to 10 are arranged in time series in accordance with a rotation instruction signal output from the device. 21 is turned on and off. In this example, when a current flows in each coil 1 to 3 in the direction of arrow A in FIG. 1, each stator 6 to 8 is set so that an N pole is generated on the surface side facing the rotor 5 in FIG. There is.

Next, the rotating operation of the step motor 4 will be described with reference to FIG.

Since three types of coils 1 to 3 are used in this example, there are six combinations of magnetic poles generated in the stators 6 to 8 by the coils 1 to 3 as shown in FIGS. The orientation of the rotor 5 is as shown in FIG. In this example, the rotation of the step motor 4 is controlled by selecting the six types of states in a predetermined order.

Next, in the circuit shown in FIG.
4 to 9 show examples of current flow paths when magnetic poles are generated in the coils 1 to 3 as shown in FIGS. 4 to 9, arrows B to G indicate the directions of currents, and
4 to 9 correspond to the drawings in FIGS. 3a to 3f, respectively.

FIG. 10 is an explanatory diagram showing the on / off states of the transistors 10 to 21 when a current flows as shown in FIGS. 4 to 9, respectively. That is, by turning on / off the transistors 10 to 21 as shown in FIG.
The orientation of the rotor 5 can be controlled as shown in a to f. In the figure, “1” indicates the ON state,
“0” indicates off state, on time is 150ms
ec.

Now, the second hand (not shown) is driven by one motor having the above construction, and the minute hand (not shown) and the hour hand (not shown) are the other one having the above construction. The hand movement will be described by taking a timepiece that is driven by motors and controls these two motors by the control circuit 22 described above as an example. The second hand is assumed to carry 6 seconds when the rotor of the drive motor makes one revolution, and the minute hand and the hour hand are 1 minute 30 when the rotor of the drive motor makes one revolution.
Second hand movement shall be performed. That is, the second hand moves for 1 second in 1 step, and the minute hand and the hour hand move for 15 seconds in 1 step.

When normal hand movement is carried out by the rotation instruction signal of the hand movement mode designating device, the control circuit 22 executes the steps of FIGS. As described above, the drive motor for the second hand is controlled every 1 second as shown in FIGS. 10A, 10B, 10C, 10D, 10E, and 10F, so that the second hand moves 1 second every 1 second. The drive motors for the minute hand and hour hand are shown in FIGS. 10a, b, c, at 15 second intervals.
Controls d, e, f. Therefore, the minute hand and the hour hand move for 15 seconds every 15 seconds.

When the time is designated by the rotation instruction signal of the hand movement mode designating device and the second hand is fast-forwarded by one second step (clockwise is the positive direction), the second hand drive motor is operated as shown in FIG. 10a, b, c, d, e, f ...
Is continuously controlled. Even when the minute hand and the hour hand are moved in the fast forward direction in 15-second steps, the drive motors for the minute hand and the hour hand are continuously controlled as shown in FIGS. 10a, b, c, d, e, f.

When the second hand is operated in the reverse fast forward movement of 1 second step and the minute hand and the hour hand are operated in the reverse fast forward movement of 15 second step, the control circuit 22 controls the respective drive motors as shown in FIGS. Control of d, c, b, a ... Is continuously performed.

When the second hand is moved forward in the forward direction in steps of 2 seconds, as shown in FIGS.
10a, e, c, a, in the case of performing the reverse fast forward hand movement of the step of 2 seconds by controlling e, a, c, e ...
e, c ... Are controlled.

When the minute hand and hour hand are moved forward in the forward direction in 30 second steps, the drive motors for the minute hand and hour hand are controlled as shown in FIGS.
If you want to carry out reverse fast forward movement in 30 second steps,
0a, e, c, a, e, c ...

As described above, in this example, since the coils 1 to 3 of the step motor are always connected in series and driven, the current flowing through the coils can be suppressed even if a small number of coils is used. , The allowable current of the power supply can be reduced. Therefore, the current flowing through the entire circuit can be reduced and the configuration can be downsized. In this case, although the magnetic force generated in each coil becomes small and the torque of the rotor becomes small, a sufficient torque is not necessary for the movement of the timepiece, so that sufficient practicality can be obtained.

In this example, the step motor is 3
Although the one having one coil and the rotor having two poles is used, the step motor is not limited to this and can be appropriately changed.

In the above example, the present invention is used in a timepiece having a motor for driving the second hand and a motor for driving the minute hand and the hour hand, but the present invention is not limited to this, and the hand movement is controlled by one motor. The same effect as described above can be obtained by using the same in a clock or a clock in which the hour hand and the minute hand are operated by separate motors.

Although the on-time of the transistors 10 to 21 is set to 150 msec, it is not limited to this and can be changed as appropriate.

[0024]

According to the present invention, a rotation instruction for instructing a rotation operation of a step motor is provided to a step motor having a plurality of coils which can be connected in series in arbitrary directions by a plurality of switch elements and a rotor having a plurality of magnetic poles. The switching element is controlled according to the signal to connect a plurality of coils in a desired direction in series with the power supply, and a desired magnetic field is generated in each of the plurality of coils to control the rotation operation of the rotor. Driving can be performed using a small coil with a small number of turns without increasing the allowable current of. Therefore, the entire configuration can be downsized and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing one embodiment of the present invention.

FIG. 2 is a detailed view of a main part of FIG. 1;

FIG. 3 is an explanatory diagram for explaining the operation of FIG. 1;

FIG. 4 is an explanatory diagram for explaining the operation of FIG. 1;

FIG. 5 is an explanatory diagram for explaining the operation of FIG. 1;

FIG. 6 is an explanatory diagram for explaining the operation of FIG. 1;

FIG. 7 is an explanatory diagram for explaining the operation of FIG. 1;

FIG. 8 is an explanatory diagram for explaining the operation of FIG. 1;

FIG. 9 is an explanatory diagram for explaining the operation of FIG. 1.

FIG. 10 is an explanatory diagram for explaining the operation of FIG. 1.

FIG. 11 is a block circuit diagram showing a conventional step motor drive control device.

[Explanation of symbols]

 1 to 3 coil 5 rotor 4 step motor 10 to 21 switch element 22 control means

Claims (1)

[Claims] 1. A step motor having a plurality of coils each of which can be connected in series in arbitrary directions by a plurality of switch elements, and a rotor having a plurality of magnetic poles, and a rotation instruction signal for instructing a rotation operation of the step motor. Accordingly, the switching element is controlled to connect the plurality of coils in a desired direction in series to the power supply, generate a desired magnetic field in each of the plurality of coils, and control the rotation operation of the rotor. A step motor drive control device comprising: a control unit.