JPS60255072A - 2-position controller of dc motor - Google Patents

Abstract

PURPOSE:To decide two positions for stopping a DC motor with a simplified construction by moving a brush on a conductive pattern synchronized with the rotary drive of the motor. CONSTITUTION:The output shaft 2 of a DC motor 1 is coupled with an actuator 3, and the operating state of a driven unit 4 is decided on the basis of the operation of the actuator 3. The shaft 2 operates the actuator 3 and simultaneously moves a brush 5 on a conductive pattern. The pattern has the first - third conductive patterns 6-8, thereby deciding the stopping position of the motor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device that can be placed directly above the actuator to drive various actuators.

(Prior Art) Conventionally, a system is known in which an actuator is attached to the output shaft of a DC motor, and the drive control is performed so that the actuator performs a desired operation by controlling the rotational state of the DC motor. Examples of the above devices include an actuator that opens or closes an on-off valve installed in a fluid flow path, or a pressure fluid flow control device for a variable damping force hydraulic shock absorber used in a vehicle. There are actuators, etc., and in both cases, the actuator is actuated by the rotation of a DC motor, and the stop position of the DC motor is controlled externally to determine the opening/closing status of the valve driven by the actuator. There is.

In the case of the above-mentioned conventional device, a position detector that detects the operating state of the actuator driven by the rotation of a DC motor is generally attached to the actuator, and the detection signal obtained by this position detector is transmitted to the DC motor. The controller is equipped with a controller that feeds back a control signal for the motor, and this controller generates a control signal that determines the stop position of the DC motor, thereby controlling the driving state of the DC motor.

However, such conventional devices must be equipped with a position detector to detect the operating state of the actuator and a controller for driving the DC motor, making the entire control system complicated and inevitably This method has the disadvantage that the number of devices and parts increases, leading to an increase in cost.

(Object of the Invention) The present invention eliminates the drawbacks of conventional DC motor control devices as described above, and provides a control device that can determine two positions at which a DC motor stops using a simplified device configuration. Specifically, it is an object of the present invention to provide a device that can eliminate the position detector and the controller that feeds back the motor drive signal used in conventional devices.

(Structure 1 of the Invention) In order to achieve the above object, the present invention provides an M11 brush that moves in synchronization with the rotation of the DC motor, a first conductive pattern that comes into sliding contact with the brush when the brush moves, and the first conductive pattern. a second conductive pattern and a third conductive pattern arranged on both end sides of the conductive pattern, a diode connected in the forward direction from the first conductive pattern to the second conductive pattern, and a diode connected in the forward direction from the eighth conductive pattern to the first conductive pattern. a diode connected in the forward direction, and further provided with a first changeover switch and a second changeover switch connected to the positive and negative sides of a DC power supply for rotating the DC motor and each having two connection terminals. A first terminal of the first changeover switch and a second terminal of the second changeover switch are connected to the first conductive pattern, and the second terminal of the first changeover switch and the first terminal of the second changeover switch are connected to each other. are connected to the DC motor drive input end, and the DC motor is set at a stop position where the brush comes into contact with only one of the second conductive pattern or the eighth conductive pattern; The main object of the present invention is to provide a two-position control device for a DC motor, which is characterized in that it controls the motor in two positions: a position where the motor moves across the first conductive pattern, and a position where the motor stops when it contacts only the other. . With the above configuration, the riko starts moving on the conductive pattern in synchronization with the rotational drive of the DC motor.
After passing over the first conductive pattern, when the @11 child reaches the second conductive pattern or the third conductive pattern, the rotation of the DC motor stops, and the DC By rotating the motor in the opposite direction and continuing to rotate until it reaches the stop position on the other side, then stop it.
This provides an operational mode in which the stop position of the DC motor can be controlled to two positions.

(Example) An example of a two-position control device for a DC motor according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing the basic configuration of the present invention. In the figure, / indicates a DC motor, the output shaft of which is connected to an actuator 3. The operating state of the driver is determined. For example, when the variable damping force type hydraulic shock absorber described above is used as the driven body, a means for switching the liquid flowing into the cylinder constituting the device is provided, and the switching control is performed in accordance with the running state of the vehicle. In addition, if a pipe body that connects and disconnects fluid flow is used as the driven body, it may be used to control the opening and closing of an on-off valve installed in the pipe body. .

The output shaft is connected to the brush S so that the actuator 3 can be actuated and the brush 5 can be moved between arrows A and B at the same time. One end (the upper end in the figure) of this riko j is connected to a first conductive pattern 6 located in the center, and a second conductive pattern 7 and a third conductive pattern arranged on both sides of the first conductive pattern 6. The other end of the relator 5 is formed so as to be in sliding contact with the common conductive pattern at all times. Sho 10 *
/(' is a mechanical stopper that regulates the maximum movement range of the brush 3. A diode l/ is connected in the forward direction from the first conductive pattern B to the second conductive pattern 7,
Further, a diode /J is connected in the forward direction from the third conductive pattern g to the first conductive pattern 6.

On the other hand, a DC power source /3 for rotationally driving the DC motor /
A first changeover switch 13 is provided on the positive side of the DC power source 13, and a first terminal lμa and a second terminal 71b are respectively arranged thereon, and a second changeover switch 13 is provided on the negative side of the DC power source 13. A first terminal/3a and a second terminal isb are respectively arranged. The first terminal 1Q-a of the first changeover switch/44 and the second terminal /3b of the second changeover switch 15 are connected to the first conductive pattern A by a lead wire/AK connection, and are connected to the first conductive pattern A. 2nd terminal of Q-/IA”b
and the first terminal /ja of the second changeover switch /3 is the lead wire /
7 and is connected to the drive input terminal of the DC motor. The operation piece 44c of the first changeover switch/Hiro and the operation piece 3 of the second changeover switch/3 are configured to move.

The operation of the apparatus of the present invention having the above configuration will be explained below.

Figure 2 shows the first changeover switch and the second changeover switch.
The operation pieces l←c and /jc of 3 are respectively connected to the first terminals /4La.

/31L@ is shown. That is, as shown by the thick line in the figure, the positive electrode of the DC power supply /3 - the first terminal of the first changeover switch tile A - the first conductive pattern 6 - the diode H →
Second conductive pattern? -1! I child S → common pattern? →
DC motor/→first terminal of second selector switch 15/j
A closed circuit it of the negative electrode of the DC power source /3 is formed, and the DC motor / starts rotating.

Then, the brush j, which moves in synchronization with the DC motor, moves in the direction of the arrow shown in the figure while slidingly contacting each conductive pattern, and reaches the position of the arrowhead B. Then, the conduction state between the first conductive pattern t and the lily pad j is turned off by the action of the diode /, so that the rotation of the DC motor / is stopped. Therefore, brush j
The stop position of one side of the DC motor l can be maintained at position B where the motor stops.

Next, in FIG. 3, the operating pieces /lAa, /3c of the first changeover switch lhiro and the second changeover switch lj are connected to the second terminal /hiro13. /j5b side. That is, as shown by the thick line in the figure, the positive terminal of the DC power supply 13 - the second terminal of the first changeover switch) Q, b - DC motor / → common pattern 9 - brush S - third conductive pattern Z - diode saw - First conductive pattern A - Second terminal of second changeover switch/3/
A closed circuit /q of Jb and the negative electrode of the DC power supply 13 is formed. Since the current flow in this closed circuit /9 is opposite to that of the closed circuit it shown in FIG. 2, the DC motor / starts rotating in the reverse direction, and the brush S moves in synchronization with the DC motor /.
moves in the direction of the arrow shown while sliding on each conductive pattern from position B in Figure WJ8, and stops at position A of the arrowhead. Therefore, at the A position where the brush 5 stops, the other stop position of the DC motor 1 can be maintained. In the end, changeover switch A, /! By the operation in step 3, the DC motor / rotates forward or reverse, and moves in synchronization with the rotation of this DC motor - Forces Riko S to reciprocate between position A and position B shown in Figure 1. Therefore, the operation stop position of the actuator 3 connected to the output shaft of the DC motor 1 can be controlled to two positions.

The configuration and operation of the present invention have been explained above based on the schematic diagram shown in FIG. 1, and an actual example of the apparatus is shown in FIGS. 4 and 6. That is, FIG. 4 shows a specific example of the brush j, in which the contact ja in sliding contact with the common pattern 9 and the contact ja-b in sliding contact with each conductive pattern are symmetrical about the rotation axis 0 of the DC motor. is formed. FIG. 6 shows an example of the arrangement of each conductive pattern with which the brush S rotates and moves while sliding concentrically. When the brush J reaches the same stopper /θ, 70K as the component shown in FIG. This indicates the area of The mechanical stoppers 10, 10 restrict the maximum rotation range of the DC motor output shaft, and are provided to ensure safety so that the lever 5 does not deviate from the conductive pattern.

The shape of the gap between the first conductive pattern 6, which is a component of the present invention, the second conductive pattern 7 disposed on both ends of the first conductive pattern 6, and the third conductive pattern r is the pattern on the -blade side and the pattern on the other side. are arranged obliquely with respect to the moving direction of the brush S. With the above configuration, the minimum gap between each conductive pattern in the moving direction of the brush j is It is formed to be as small as or even smaller than its own maximum effective width in the direction of movement.

By adopting the above pattern shape, when the brush S is moved, there is no need to disconnect from the power source, and the forward and reverse rotations of the DC motor can proceed smoothly.

(Effects of the Invention) By using the two-position control device for a DC motor according to the present invention described in detail above, the following various advantages (and operational effects) can be brought about. At the same time as connecting to the actuator, the brush is directly slid to determine the stop position, so the actuator position detector, which was previously required, and the detection signal obtained by this position detector can be transferred to the DC motor. It is possible to completely eliminate the need for a controller that provides feedback as a control signal, which simplifies the configuration of the device and reduces costs.
The reliability of the device can be improved. In other words,
Since the DC motor's own rotation is used to generate a feedback signal that determines the motor's stop position, there is no cause for malfunction, and the simple structure ensures reliable operation. This exhibits the advantage of increased performance.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the basic configuration of the present invention, FIGS. 2 and 8 are explanatory diagrams of the operation of the apparatus of the present invention, and FIG. 4. FIG. 5 is a plan view showing a specific configuration example of the present invention. l...DC motor, λ...output shaft, 3...actuator, q...driven body, S...meter, 6...
・First conductive pattern, 7... Second conductive pattern, r・
...1B conductive pattern 7, //, /co...diode,
/J...DC power supply, Slag...1st changeover switch, l
Hiroa...first terminal, /jib...second terminal, l! ;
...Second changeover switch, /3 a...First terminal, /
Jt)...Second terminal. Figure 1 16 Figure 2 8

Claims (2)

[Claims] (1) An actuator driven by the rotation of a DC motor, a driven body whose operating state is determined by the position at which the actuator stops, and a control mechanism for controlling the two positions at which the DC motor stops. In a two-position control device for a DC motor-C1: a brush that moves in synchronization with the rotation of the DC motor, a first conductive pattern that comes into sliding contact when the brush moves, and second conductive patterns disposed on both ends of the first conductive pattern. A conductive pattern and a third conductive pattern, a diode connected in a forward direction from the first conductive pattern to the second conductive pattern, and a diode connected in the forward direction from the third conductive pattern to the first conductive pattern. A first changeover switch and a second changeover switch are provided, each of which is equipped with a diode, and which is connected to the positive and negative sides of a DC power supply for rotating the DC motor, and has two connection terminals,
connecting a first terminal of the first changeover switch and a second terminal of the second changeover switch to the first conductive pattern;
The second terminal of the first changeover switch and the first terminal of the second changeover switch are connected to the input terminal for driving a DC motor, and the stop position of the DC motor is determined by the brush, the second conductive pattern or the first terminal of the second changeover switch. Control is performed in two positions: a position in which the third conductive pattern is stopped in contact with only one of the third conductive patterns, and a position in which the third conductive pattern is moved across the first conductive pattern from this position and stopped in contact with only one of the other conductive patterns. Features: 2-position control device for DC motor. (2) The minimum gap in the moving direction of the brush between the first conductive pattern and the second conductive pattern and the 84th conductive pattern disposed on both ends of the first conductive pattern is 111 mm. The two-position control device for a DC motor according to claim 1, wherein the two-position control device for a DC motor is formed to have a width equal to or smaller than its own maximum effective width in the direction of movement.