JPH0317587Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention can be used, for example, to open and close a damper installed at the outlet of a cold air duct of a refrigerator as a load in a reciprocating motion, or to apply a reciprocating motion to an article transfer table of an automatic assembly device. Related to motor actuators used for etc.

[Prior art]

Conventional actuators include those using a solenoid as shown in FIG. 6, and those using a motor as shown in FIG. 7. For example, if the load side of the actuator is a damper installed at the outlet of a cold air duct of a refrigerator, the opening and closing of this damper is controlled by a damper (not shown) connected to the solenoid 28 by a reciprocating member 5 in FIG. When the damper is closed, it is closed by a spring provided in the solenoid 28 or by a spring (not shown), and when the damper is opened, the solenoid 28 is energized.

Therefore, when the damper is open, current is constantly flowing, which generates heat from the windings of the solenoid 28 and consumes a lot of power.In order to suppress heat generation, increasing the amount of windings using thick wires increases the size and cost. Also, since the opening and closing operations are fast, there are drawbacks such as loud impact noise.

On the other hand, in FIG. 7, an actuator using a motor is shown, and the output shaft 3 of the motor 29 is
A rotary disk 31 is fixed to the rotating disk 31, and the reciprocating member 5 is loosely fitted onto the connecting shaft 32 and connected to the rotating shaft 31. Furthermore, the rotating disk 31 has a protrusion 33 on the outer peripheral surface of the connecting shaft 32. The damper is opened and closed by pressing contact pieces 36 of switches 34 and 35 with this protrusion 33. However, when the damper is in the open or closed position, the motor is in a non-energized state, and the position of the rotary disk 31 and the damper is maintained only by the attraction force between the rotor and stator of the motor. If this is applied, the rotary disk will be rotated due to vibrations on the load side of the damper, etc., and the open/closed state of the damper will be different.

[Purpose of invention]

In view of the above drawbacks, the present invention has a simple structure in which a reciprocating member is connected between the rotating member and the load, and the rotating member is controlled so that the reciprocating member stops in front of the dead center position. It is an object of the present invention to propose a motor-type actuator that reduces operating speed, operates with low power, reduces impact noise, and prevents reciprocating members from changing due to accelerations such as vibrations.

[Structure of the idea]

The present invention includes a motor that rotates in one direction with a reverse rotation prevention mechanism, a rotating member rotated by this motor, a reciprocating member that is driven by this rotating member to move a load, and a reciprocating member that rotates in one direction before the dead center position. The present invention further includes a control member that controls the rotating member to stop at the side.

〔Example〕

FIG. 1 shows an embodiment of a motor-type actuator, and FIG. 2 is a control circuit diagram thereof. In FIG. 1, the motor-type actuator according to this embodiment has a rotary disk 3 as a rotating member fixed to the output shaft 2 of a motor 1 provided with a reverse rotation prevention mechanism, and a connecting shaft 4 mounted on this rotary disk 3. At the same time, a reciprocating member 5 is loosely fitted to the connecting shaft 4, and as the rotary disk 3 rotates, the reciprocating member 5 converts the rotational motion into reciprocating motion to reciprocate the load. I'm letting you do it. In addition, a notch 3 is provided on the outer periphery of the turntable 3.
a is provided, and a control member 6 and a control member 7 are provided on the outer peripheral side of the rotary disk 3. The control member 6 and the control member 7 operate when facing the notch 3a, respectively. For example, if the load side is a damper provided at the outlet of a cold air duct of a refrigerator, the control member 6 blows out cold air. The control member 7 includes an active detection switch that detects when the damper is in the open state (active state) to stop the cold air from blowing out. It consists of a non-active detection switch that detects when the switch becomes non-active (non-active state).

The above-mentioned reverse rotation prevention mechanism is based on the rotor shaft 8 of the motor 1.
A reduction gear train of gears 10, 11, and 12 is provided between the output shaft 2 and the output shaft 2, and an operating lever 9 is rotatably supported on the shaft 13 of the gear 10 and is in sliding contact with the gear 10. This operating lever 9 has a protrusion 9
a is formed. On the other hand, the rotor shaft 8 is provided with a stopper 8a and a pinion, and the pinion is meshed with the gear 10. Then, when the rotor shaft 8 is reversed, that is, the stopper 8a is about to rotate clockwise, the stopper 8a and the protrusion 9
The rotor is configured so that the rotation of the rotor is stopped when the two are engaged.

Generally, such a reversal prevention mechanism is used in synchronous motors, etc., where the rotor rotation direction is undefined when the motor is started, and the motor has almost no rotational torque when the motor is started. It stipulates that That is, when the rotor starts rotating in the opposite direction to the specified direction when the motor starts, the stopper 8a and the protrusion 9a engage with each other as described above to stop the rotor from rotating, and when the motor starts, the rotor starts rotating in the opposite direction to the specified direction. Since it has almost no torque, this rotor immediately changes its direction of rotation and starts rotating in the specified direction. Then, the stopper 8a and the protrusion 9a are disengaged, and the operating lever 9 is released.
Since the rotor is held outside the rotation range of the stopper 8a, the rotor can continue to rotate. Further, when the rotor starts rotating in the prescribed direction when the motor is started, the stopper 8a and the protrusion 9a do not engage with each other, and the rotor continues to rotate. From the above, the rotation direction of the motor is defined in one direction by the reverse rotation stop mechanism.

On the other hand, the control member 6 consisting of the active detection switch is disposed facing the rotary disk 3 at the top dead center position A, and stops the rotation of the rotary disk 3 when facing the notch 3a of the rotary disk 3. Further, regarding the positional relationship between the notch 3a of the rotary disk 3 and the connecting shaft 4, the connecting shaft 4 is provided on the rotary disk 3 at a position having a delay angle α from the notch 3a with respect to the rotation direction. Therefore, the reciprocating member 5 loosely fitted to the connecting shaft 4
stops at a position that is an angle α in front of the top dead center. Further, the control member 7 consisting of the non-active detection switch is disposed facing the rotary disk 3 at a position advanced by an angle α from the bottom dead center B position, so that the rotary disk 3 is located at the bottom dead center. It will stop at position B.

The control circuit in FIG.
A control member 6 and a triax 15 are connected in series, a series circuit of a resistor 16 and another triax 17 is connected in parallel to this series circuit, and another triax 18 and a control circuit are connected to the series circuit of the control member 6 and triax 15 in parallel. The series circuits of the members 7 are connected in parallel, and resistors 19 and 20 are connected to the gates of the triaxes 15 and 17, respectively, and the terminal 2 is connected to the other end of the resistor.
1 is connected, and the gate of triac 18 is connected to the connection point between resistor 16 and triac 17 via resistor 22.

The operation of the motor-type actuator starts when a high signal is input to the terminal 21 of the control circuit shown in FIG. 2 when the reciprocating member 5 is at the position indicated by the two-dot chain line, that is, the stop position at the bottom dead center B. 1
5 and 17 are turned on, and the triax 18 is turned off. In this position, the control member 6 is turned on and the control member 7 is turned off, so that the motor 1 starts rotating. Then, current is supplied to the motor 1 until the control member 6 is turned off.

When the rotor shaft 8 of the motor 1 is rotated counterclockwise in FIG.
is rotated clockwise, and when the rotary disk 3 is rotated clockwise, the reciprocating member 5 is moved upward,
In addition, the rotary disk 3 rotates to connect the notch 3a and the control member 6.
When the two are opposed to each other, the control member 6 is turned off and the rotation of the motor 1 is stopped. At this time, the reciprocating member 5 will stop before the top dead center.

When the reciprocating member 5 is stopped at this position, when a force is applied to the reciprocating member 5 from the load side in the downward direction in FIG. , the rotational torque of the rotary disk 3 is generated in the reverse direction, and the rotary disk 3 tries to rotate counterclockwise.
By increasing the speed by the speed increasing mechanism 1 and 10 and transmitting it to the stopper 8a and the operating lever 9, the reverse rotation prevention mechanism of the motor 1 works, that is,
The actuating lever 9 is rotated counterclockwise and the protrusion 9a
comes into contact with the stopper 8a, the rotary disk 3 stops rotating, and the damper, which is a load, is maintained in the open state.

Furthermore, when a force is applied to the reciprocating member 5 from the load side in the upward direction in FIG.
The rotational force of the rotary disk 3 becomes 0, and the rotary disk 3 does not rotate either clockwise or counterclockwise. Therefore, the position of the load is also maintained, that is, the open state of the damper is also maintained.

Therefore, even if a force is applied from the load side to the reciprocating member 5 at the stop position, the reciprocating member 5 is stopped near the top dead center, so in FIG.
For clockwise rotation, it only rotates slightly between the above-mentioned stop position and top dead center, and for counterclockwise rotation, it only rotates slightly until the above-mentioned reversal prevention mechanism is activated. Therefore, the reciprocating member 5 is restricted in its rotation, and the damper is kept open. Note that since the rotation of the rotary disk 3 is accelerated by the gear train and transmitted to the operating lever 9 and the stopper 8a, the reversal prevention mechanism operates almost simultaneously when the rotary disk 3 rotates counterclockwise. In addition, the stopping position of the reciprocating member 5 is located at an angle α in the direction of rotation from the top dead center, and this angle α is the same as when the reciprocating member 5 receives a force downward in FIG. When,
It is only necessary that the rotational torque of the rotary disk 3 is set so as to act in the reverse direction of the motor,
The angle α only needs to be small. From the above, even if the reciprocating member 5 receives vibration from the load side, the stop position of the rotary disk 3 is maintained, and therefore the position of the load is also maintained.

Next, when the terminal 21 becomes low, the tri-attack 1
5 and 17 are off and the triax 18 is on, while the control member 7 is on, causing the motor 1 to rotate and the reciprocating member 5 to be stopped at the bottom dead center position of the two-dot chain line in FIG. It will not be moved even if force is applied from the side.

In the above control circuit, when the power is turned off and the terminal 21 becomes open, the triax 18 is turned on via the resistors 16 and 22, so that the control member 7 is always stopped at the OFF position, thereby achieving initial recovery. .

When the motor-type actuator is configured as described above, it does not generate impact noise like a solenoid, and the reciprocating member 5 stops just before the dead center position, so even if vibrations etc. are applied, the load can be reliably handled. The stop position can be maintained. In addition, current only needs to flow during operation, and no current is required to hold the load in its stopped position, resulting in low power consumption and eliminating the need for measures to deal with heat generation in the drive circuit, which also reduces costs. It has a big effect.

In the above embodiment, only the top dead center position has been described as the dead center position, but the same can be applied to the bottom dead center position.

FIG. 3 shows the second embodiment, in which the output shaft 2 of the motor 1
A worm 23 is fixed to and a worm gear 24 is fixed integrally with the rotary disk 3 as a rotating member.
Even if a force is applied to the reciprocating member 5 from the load side, the rotary disk 3 will not rotate due to the combination of a worm and a worm gear.Furthermore, if a permanent magnet type AC motor such as a synchronous motor is used, the magnet will not rotate. Since the worm's position tends to be stopped by the suction force of the yoke, it can be held more reliably against fluctuations due to load even when vibrations are applied. Furthermore,
This second embodiment is also best configured so that the rotational torque of the rotating member in response to the force from the load side acts in the reverse direction, and when the control member 6 faces the notch 3a of the rotary disk 3, , the reciprocating member 5 stops before the top dead center position.

4 and 5 show modified examples of the control circuit. In FIG. 4, a relay 26 is operated by a transistor 25,
A relay switch 27 is connected in series to the motor 1, a control member 6 consisting of an active detection switch, and a control member 7 consisting of a non-active detection switch. In FIG. 5, a changeover switch is used as the control member 6 to form a circuit. The operation of the control circuits in FIGS. 4 and 5 is substantially the same as that in FIG. 2.

In addition, although the motor was described as an AC motor in the above description, it may be configured as a DC motor.

Moreover, although the rotation of the output shaft of the motor has been described as clockwise so that the rotating member rotates clockwise, it may be configured to rotate counterclockwise.

The control members 6, 7 may be constructed by any means such as magnetic sensors or optical switches.

[Effect of idea]

Since the present invention is constructed as described above, it operates slowly and does not generate impact noise, and even if external vibrations are applied, the load position will not change unless the mechanism is destroyed, making it highly reliable. It is possible to provide a motor-type actuator that exhibits excellent practical effects.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main parts of the motor actuator according to the first embodiment of the present invention, Fig. 2 is a control circuit diagram,
Figure 3 is a plan view of the main parts of the second embodiment, Figures 4 and 5.
6 is a plan view of a conventional solenoid actuator, and FIG. 7 is a plan view A and a sectional side view B of a conventional motor actuator. 1... Motor, 3... Rotating member, 5... Reciprocating member, 6, 7... Control member, A... Top dead center.

Claims (1)

[Scope of utility model registration request] A motor provided with a reverse rotation prevention mechanism to rotate in one direction, a rotating member rotated by the motor, a reciprocating member driven by the rotating member to move a load, and stopping the reciprocating member near the dead center position. and a control member that controls rotation of the rotating member so as to rotate the rotating member.