JPS6334215A - Drive control device for actuator - Google Patents

Abstract

PURPOSE:To simplify the structure by applying the voltage to a DC motor in response to the position of the movable electric contact interlocked with the DC motor and decreasing the applied voltage near the operating limit point of a actuator output lever in the said device of an air conditioner damper for vehicle. CONSTITUTION:When a movable contact 31 is located at a solid line position, nearly the power supply voltage is applied to a DC motor 23 via the DC motor 23, a diode 24, a fixed contact 25, and a movable contact 30. Then, the movable contact 31 interlocked with the motor 23 is moved from (d) toward (a). When the movable contact 31 is moved to a dotted line position near (a), the contact with the fixed contact 25 is released, a resistor 28 is inserted, and the voltage is applied, to the motor 23 is lowered. When the negative voltage is applied, the movable contact 31 moved toward (d), and the applied voltage is likewise changed. According to this constitution, an external mechanism can be correctly moved without using a complex mechanical adjusting mechanism.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an actuator when a servo motor is used as an actuator used to control the opening and closing of a damper provided in an automobile air conditioner, for example. This invention relates to a drive control device.

[Prior Art] For example, dampers used to control the air distribution to the outlet of an automobile air conditioner include a damper for distributing air to the feet, a damper for distributing air to the head, and a damper for the differential. Yes, these dampers can be used for example in five air distribution states, namely vent (V), pie level (, B/L), and heat (H).
, heat differential (H/D), and differential (D), their opening degrees are controlled respectively. Among these dampers, the damper for distributing air to the feet is a vent (V
) and differential (D) must be completely closed in the two air distribution states.

FIG. 4 shows the damper drive mechanism that needs to be completely closed in the two air distribution states (■ and D), in which the output lever 11 of the actuator is moved by the servo motor main body 12. , is adapted to be rotated about the shaft 11a as a fulcrum.

Then, when the output lever 11 is rotated from the D position to the H position by the servo motor body 12, the L-shaped link 13 is rotated about the shaft 13b as a fulcrum, and the L-shaped link 13 is rotated about the shaft 13b. The pin 13c is moved along the groove 14a of the grooved lever 14 to the center position of this groove 14a. When the grooved lever 14 is rotated about the shaft 14b as the pin 13c moves, the shaft 15a
The rod 15 is attached to the grooved lever 14 by
becomes depressed.

As a result, the tamper arm 16 is rotated about the axis lea, and the damper 17 is integrated with the arm 16.
is driven from the closed state to the open state using the shaft 16a as a fulcrum.

Further, when the output lever 11 is rotated from the H position to the V position, the pin 13c of the L-shaped lever 13 is further moved from the center position of the groove 14a, and the grooved lever 14 is
It comes to be rotated in the opposite direction to the above-described rotation direction.

Therefore, the rod 15 is pulled up, and the damper 17 is returned from the open state to the closed state.

However, in such a mechanical drive mechanism,
Link 13, lever 14, rod 15, and arm 1
6 etc., the damper 17 may not be completely closed, and the damper 17 may be completely opened before the output lever 11 reaches the H position. Therefore, in the past, it was necessary to make adjustments such as making the connecting portion 13a between the output lever 11 and the L-shaped link 13 into a shape having an idle groove, and providing an adjustment mechanism 18 for adjusting the length of the rod 15. However, even with such adjustment, it is difficult to completely close the tamper 17 at both the positions ■ and D. For example, as shown in FIG. If the damper 17 is adjusted to be completely closed, the damper 17 will not be completely closed at the position (■), or the damper 17 will close before reaching the position (■).
7 becomes closed, causing motor rotation.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned points. The purpose is to provide an actuator drive control device that can reliably move the actuator to a desired movement position. For example, when used in an automobile air conditioner as described above, the differential (D) and vent This allows the damper to be completely closed in both air distribution conditions.

(Means for solving the problem) That is, in the actuator drive control device according to the present invention, it is possible to apply a voltage value to the DC motor that corresponds to the position of the movable electric contact that is moved in conjunction with the DC motor. In this way, the voltage value applied to the DC motor is reduced near the limit position of the operating range of the output lever of the actuator.

(Function) In other words, in an actuator drive control device equipped with the above means, the torque of the DC motor decreases near the limit position of the operating range of the output lever of the actuator, and motor lock occurs. Since the DC motor will not burn out even if the actuator is operated, the range of motion of the output lever of the actuator can be set beyond the desired range of motion, and there is no need for mechanical adjustment, especially at the limit position of the operating range. .

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a mechanism for controlling the opening and closing of a damper in an automobile air conditioner. In this control mechanism, a servo motor 21 is used as an actuator of a servo control device, and an output lever (not shown) is used. 11) or rotationally controlled. The servo motor 21 includes a DC motor 28 in its main body.
One electrode of 3 is connected to a power supply terminal 201, and the other electrode is connected to a first fixed electrical contact 25 via a diode 24. - said electrode is further connected to a second fixed electrical contact 27 via a diode 26 of opposite polarity to that of said diode 24 and to a third fixed electrical contact 29 via a resistor 28; These fixed electrical contacts 25, 27, 29 are connected to the movable electrical contacts 3
A fourth fixed electrical contact 30 is provided so as to be in sliding contact with the movable electrical contact 31. This fixed 'nausea contact 30 is adapted to be connected to a power supply terminal 202. The movable electrical contacts 31 are in contact with the fixed electrical contacts 25, 27, 29, 30, respectively.
A DC motor 23 is used to reciprocate over these fixed electrical contacts 25, 27, 29, and 30.

Here, the first and second fixed electrical contacts 25 and 27 are brought into contact with the movable electrical contact 31 at one end of the movable electrical contact 31, respectively.

That is, with a positive voltage applied to the power supply terminal 201 and a negative voltage applied to the power supply terminal 202, the movable electrical contact 3
1 is in the position shown by the solid line, the current flows through the DC motor 23, the diode 24, the fixed electrical contact 25, the movable electrical contact 31 and the fixed electrical contact 30 to the power supply terminal 2.
01 to the power supply terminal 202.

In this case, since the value of the voltage applied to the DC motor 23 is approximately equal to the value E of the power supply voltage, the torque of the motor 23 becomes the normal torque Ta as shown in FIG.

As described above, the movable electrical contact 31 is linked to the DC motor 23, so when a positive voltage is applied to the power supply terminal 201, the movable electrical contact 31 is moved in the direction from d to a. When the movable electrical contact 31 is moved to the position shown by the dotted line (a position between a and b), the contact state between the movable electrical contact 31 and the fixed electrical contact 25 is broken, so that the current are a DC motor 23, a resistor 28, a fixed electrical contact 29, a movable electrical contact 31, and a fixed electrical contact 30.
The current flows from the power supply terminal 201 to the power supply terminal 202 via the power supply terminal 201 . In this current path, the DC motor 23
Since the resistor 28 and the resistor 28 are connected in series, the voltage Er applied to the DC motor 23 is as follows: Er=E tr/ (r+R)1. Here, E is the power supply voltage supplied from the power supply terminal 201, r is the internal resistance value of the DC motor 23, and R is the resistance 2
The resistance value is 8. Therefore, the DC motor 23 rotates with a torque Tb lower than the torque Ta mentioned above.

Also, a negative voltage is supplied to the power terminal 201, and the power terminal 201 is supplied with a negative voltage.
When a positive voltage is supplied to DC motor 23, the direction of rotation of DC motor 23 is reversed, so that movable electrical contact 31 is moved from direction a to direction d. When the movable electrical contact 23 is moved to the position indicated by the solid line (position between b and C),
Current flows from power terminal 202 to power terminal 201 via fixed electrical contact 30, movable electrical contact 31, fixed electrical contact 27, diode 26 and DC motor 23.

At this time, since the voltage applied to the DC motor 23 is approximately equal to the value E of the power supply voltage, the torque of the DC motor 23 becomes the normal torque Ta.

Furthermore, the movable electrical contact 31 is located at the position indicated by the dotted line (C
and d), the current flows through the fixed electrical contact 30, the movable electrical contact 31, the fixed electrical contact 29, and the resistor 28.
The current flows from the power terminal 202 to the power terminal 201 via the DC motor 23 and the DC motor 23 . Therefore, the torque of the DC motor 23 in this case is Tb.

FIG. 2 shows the torque characteristics of the servo motor 21, and the current flowing through the DC motor 23 when the movable electric contact 31 is in a position between C and d is shown as Ia. 31 or position between a and b or C and d
The current flowing through the DC motor 23 when it is in a position between I
It is shown as b.

Further, curve A shows the relationship between current ■ and torque T at the rotation speed of motor 23 when power supply voltage E is applied to DC motor 23, and curve B shows the relationship between voltage Er
2 shows the relationship between current I and torque T at the rotational speed of the DC motor 23 when is applied.

When the servo motor 21 operated as described above is employed as an actuator of a damper drive mechanism as shown in FIG. 4, the opening and closing (reciprocating motion) of the damper can be controlled as shown in FIG. 3. That is, in this case, the rotation range of the output lever 22 operated by the normal torque Ta is set to a value smaller than the minimum value (between f and g) of component variations of the damper drive mechanism, and the rotation range of the output lever 22 as a whole is The rotation range is set to a value larger than the maximum value of component variation (between e and h). With this setting, the damper can be adjusted within the range of component variations (between e and f, and between g and h
Since the voltage applied to the DC motor 23 is low at that time, even if the motor locks, it will not affect the life of the DC motor.

Therefore, if such a servo motor 21 is used, it is possible to adjust the height of the vent and the differential without having to provide a mechanical adjustment mechanism such as the rond length adjustment mechanism 18 (see Fig. 4), which was conventionally required. It becomes possible to completely close the damper in both of the air distribution states of D).

In this embodiment, the servo motor 21 was used to open and close the damper of an automobile air conditioner, but it can also be used as a motor for driving a retractable light, a motor for a power window, or a motor for a motor-driven antenna. It is also possible to use

[Effects of the Invention] As described above, according to the present invention, the external mechanism can be reliably moved to a desired movement position without having to include a complicated mechanical adjustment mechanism in the drive mechanism for driving the external mechanism. You will be able to do things.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating a drive control device for an actuator according to an embodiment of the present invention, FIG. 2 is a diagram showing torque characteristics of the drive control device for the actuator, and FIG. 3 is a diagram showing the drive control device for the actuator. FIG. 4 is a diagram showing the conventional drive mechanism of the damper, and FIG. 5 is a diagram showing the damper in the open and closed state when the conventional drive mechanism is used. 2 Servo motor, 22 Output lever, 23... DC motor, 24.26 Diode, 28... Resistor,
25.27゜29, '30...Fixed electrical contact, 31
Movable electrical contacts. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Tb Ta
), Shi7T Figure 2

Claims (1)

[Scope of Claims] A DC motor that drives an output lever of an actuator, a movable electric contact that is moved in response to rotation of the DC motor and forms a drive power circuit for the motor, and at least one of the output levers. a voltage drop control element to which the movable electric contact is connected at a limit position of the operating range of the DC motor; A drive control device for an actuator, characterized in that drive power is supplied through the actuator.