JP2000224894A - Driving of multi-phase stepping motor and driving circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the transient vibration of a rotor by keeping both ends of an non-excited winding in a multi-phase stepping motor in a short-circuit condition. SOLUTION: SW11 to SW15 opened from feeding point A to E are included in a circuit 10 which connects the feeding points with a common connecting point S. For windings A to D in a exciting step 1 condition, a conventional way is taken as follows: the feeding point E is connected to the common connecting point S through the SW12 to form a short-circuit phase out of a winding (e). The feeding point A is connected to the common connecting point S through the SW15 to form a short-circuit phase out of a winding (a). In the same way, a stage rises up to a step 10, and a step 1 is then taken. The excited winding is left as it is, the non-excited winding is kept in a short-circuit condition, and in any exciting step, a set of short-circuit phase is always formed, therefore the vibration of a rotor can be restrained. On the motor side, only one wire of the common connecting point S may be added.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method and a driving circuit for suppressing transient vibration of a rotor of a multi-phase stepping motor such as a five-phase stepping motor. In the following description, a five-phase stepping motor will be described as an example.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional circuit of a four-phase excitation drive circuit for a five-phase stepping motor. 5 sets of excitation windings a to
One end of e is a feeding point A to E, and the mechanical arrangement, that is, the arrangement of the stator is annular in the order of a → b → c → d → e → a or vice versa. Line up. Each winding is connected in a star configuration as follows.

[0003] Each winding is connected as follows. Winding a
Is the feeding point A, and the winding end is connected to the common connection point S. The end of the winding b is a feeding point B, and the beginning of the winding is connected to a common connection point S. The beginning of the winding c is a feeding point C, and the end of the winding c is connected to a common connection point S. The end of the winding d is a feeding point D, and the beginning of the winding is connected to a common connection point S. The beginning of the winding e is a feeding point E, and the end of the winding e is connected to a common connection point S.

The feeding points A to E each have a high potential +
For example, a transistor or F
A switch element SW1-SW5 composed of ET and a switch element SW6- for conducting / opening to the negative side at a low potential.
The switch SW10 is controlled to one of three states of equivalently connected to the positive side, equivalently connected to the negative side, or not connected to either side.

The five-phase stepping motor is rotated by switching the potentials applied to the five feeding points by these switching elements and exciting the five windings in a predetermined order. Hereinafter, two conventional examples will be described based on the number of excitation phases.

(Conventional Example 1) FIG. 5 shows a conventional example of a four-phase excitation drive. FIG. 6 shows the generated torque vector at that time. Since the vector generated by each of the windings a to e changes by 180 degrees depending on the direction of the current, the electrical angle divides one rotation into ten.

In the excitation step (1), the feeding points A and C are connected to the + side, the feeding points B and D are connected to the − side, and the feeding point E is not connected to the + side or the − side. Thereby, depending on the direction of the current flowing through each of the windings A, B, C, and D, the torque vectors TA, TB, T
C and TD are generated, resulting in a combined torque vector T1.

When the excitation step proceeds to (2), the feeding point A
Is not connected to the + or-side. Feed points C and E are connected to the + side, and feed points B and D are connected to the-side. Thereby, depending on the direction of the current flowing through each of the windings B, C, D, and E, as shown in FIG.
C, TD, and TE are generated, resulting in a combined torque vector T2.

Similarly, the excitation step (1) shown in FIG.
0), and then returns to step (1) again. Along with this, as shown in FIG.
4 and the stepping motor is rotationally driven.

(Conventional Example 2) FIG. 7 shows a conventional example of three-phase excitation drive. The generated torque vector at that time is as shown in FIG.

In the excitation step (1), the feeding points A and C are connected to the + side, the feeding point B is connected to the-side, and the feeding points D and E are not connected to the + side or the-side. As a result, a current flows through the windings A, B, and C, but a total of the current from the winding a and the current from the winding c flows through the winding b through the winding b. Therefore, as shown in FIG. 6, the magnitude of the torque vector of the winding a and the winding c is two times the torque vector of the winding b.
The resultant torque is reduced by a factor of 1 to produce a resultant torque vector T1.

When the excitation step proceeds to (2), the feeding point B
And D are connected to the-side, the feeding point C is connected to the + side, and the feeding points E and A are not connected to the + side or the-side. As a result, current flows through the windings B, C, and D.
As shown in (2), the magnitude of the torque vectors of the windings b and d becomes half the magnitude of the torque vector of the winding c, and becomes the combined torque vector T2.

Similarly, the excitation step (1) shown in FIG.
0), and then returns to step (1) again. Along with this, as shown in FIG.
4 and the stepping motor is rotationally driven.

[0014]

In the conventional four-phase excitation, one of the five feeding points is not supplied with power, and in the three-phase excitation, two of the five feeding points are not supplied with power. In each case, the corresponding winding does not contribute to the rotational drive. On the other hand, it is necessary to suppress the rotor vibration of the stepping motor as much as possible.

Accordingly, an object of the present invention is to provide a driving method and a driving circuit capable of suppressing rotor vibration of a stepping motor.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a stable drive by making both ends of a winding in a non-excited state short-circuited to suppress rotor transient vibration. Is what you do.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a driving method and a driving circuit of a stepping motor according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 shows a conventional example 1 shown in FIG.
Is an embodiment of a four-phase excitation drive circuit corresponding to FIG. The connection configuration of the five sets of windings is the same as that of the conventional example, but a circuit 10 for connecting the common connection point S to the feeding points A to E is added. The circuit 10 connects the common connection point S to the feeding points AE, and opens the common connection point S from the feeding points AE.
W11-SW15.

FIG. 2 shows an embodiment of a four-phase excitation drive. The winding in the excited state is the same as that in FIG. 5 of the conventional example, but the winding in the non-excited state is different from the conventional example.

The windings A, B, C and D in the excitation state in the excitation step (1) are the same as those in the conventional example (FIG. 5). On the other hand, the feeding point E, which is not connected to either + or-in the conventional example, is connected to the common connection point S by SW12, and the winding e forms a short-circuit phase.

The windings B, C, D and E in the excitation state of the excitation step (2) are the same as those of the conventional example (FIG. 5). On the other hand, the feeding point A, which is not connected to either + or-in the conventional example, is connected to the common connection point S by the SW 15, and the winding a forms a short-circuit phase.

Similarly, proceed to step (10),
Then, step (1) is performed again. The combined torque vector of the present embodiment is the same as that of the conventional example shown in FIG.

(Embodiment 2) FIG. 3 shows a conventional example 2 shown in FIG.
Is an embodiment of three-phase excitation drive corresponding to FIG. The winding in the excited state is the same as that in FIG. 5 of the conventional example, but the winding in the non-excited state is different from the conventional example. Note that the drive circuit of this embodiment is the same as that of the first embodiment.

The windings A, B, and C in the excitation state in the excitation step (1) are the same as those in the conventional example (FIG. 5). On the other hand, the feeding points D and E, which are not connected to either + or-in the conventional example, are connected to the common connection point S, and the windings d and e form a short-circuit phase.

The windings B, C and D in the excitation state in the excitation step (2) are the same as those in the conventional example (FIG. 5). On the other hand, the feeding points E and A, which are not connected to either + or-in the conventional example, are connected to the common connection point S, and the windings e and a form a short-circuit phase.

Similarly, proceed to step (10),
Then, step (1) is performed again. The resultant torque vector is the same as that of the conventional example shown in FIG. In this embodiment, since two short-circuit phases are always formed, the effect of suppressing the vibration of the rotor is further increased as compared with the first embodiment.

[0027]

According to the present invention, the windings in the non-excited state in the conventional example are kept in the short-circuit state while the windings in the excited state remain as they are. In the second embodiment, two sets of short-circuit phases can always be formed, so that the effect of suppressing the vibration of the rotor is large.

Further, when implementing the present invention, it is only necessary to add one wiring of the common connection point S on the motor side as compared with the conventional example, and even if the motor and the drive circuit are separated, the implementation is extremely large. Easy.

The control signal to the switch element can also be easily synthesized based on the control signal to the existing switch group that generates a connection state to + or-. In practice, the control signal generation circuit is integrated with an IC such as a gate array. Inexpensive and easy to implement, the IC size hardly increases even if the signal generation circuit is slightly added.

[Brief description of the drawings]

FIG. 1 is an excitation circuit diagram according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a four-phase excitation drive according to the embodiment of the present invention.

FIG. 3 is a diagram for explaining three-phase excitation driving according to the embodiment of the present invention.

FIG. 4 is an excitation circuit diagram of a conventional example.

FIG. 5 is a diagram illustrating a conventional four-phase excitation drive.

FIG. 6 is a diagram illustrating a conventional four-phase excitation drive.

FIG. 8 is a diagram for explaining a conventional three-phase excitation drive.

FIG. 8 is a diagram for explaining a conventional three-phase excitation drive.

[Explanation of symbols]

 a to e 5 sets of windings of a 5-phase stepping motor A to E Feed points of each of 5 sets of windings a to e SW1-SW15 Switch element 1 Motor winding 10 Additional circuit

Claims (2)

[Claims] 1. A plurality of sets of windings of a multi-phase stepping motor, one ends of which are connected in common, and the other end of each winding is in an excitation state in which a high potential is applied or in an excitation state in which a low potential is applied. In a method of driving a multi-phase stepping motor, in which a non-excited state that is not applied is repeatedly rotated by a predetermined procedure to perform rotation driving, a winding in a non-excited state among winding ends of the plurality of sets of windings that is not a common connection end. A method of driving a multi-phase stepping motor, wherein a wire end is connected to a common connection end of the plurality of sets of windings. 2. One end of each of a plurality of sets of windings of a multi-phase stepping motor is connected in common, and the other end of each winding is in an excited state in which a high potential is applied or in an excited state in which a low potential is applied. In a drive circuit of a multi-phase stepping motor that performs rotational driving repeatedly in a predetermined procedure with and without excitation, a plurality of first switch elements for selectively connecting the other end of each winding to a high potential or a low potential. ,
A drive circuit for a multi-phase stepping motor, comprising: a plurality of second switch elements for selectively connecting the other end of each winding to a common one end.