KR890008913Y1 - Motor actuator - Google Patents

Abstract

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Description

Motor actuator

1 is a front view of the motor actuator of the present invention.

2 is his top view.

3 is a vertical cross-sectional view.

4 is an explanatory diagram showing a relationship between a cam and a switch as a position detecting means and an operation mode;

5 is a developed view of a cam.

6 is a circuit diagram of a control circuit.

* Explanation of symbols for main parts of the drawings

DESCRIPTION OF SYMBOLS 1: Motor actuator 2a, 2b: Opening and closing board as a 1st and 2nd driven member

3: motor 13: switch cam

14 switch 20 control circuit

21a, 21b: temperature detection circuit 29, 30: first and second sensors

The present invention relates to a motor actuator for independently controlling at least two driven members with a common motor.

In a recent refrigerator, a freezer compartment and a refrigerating compartment are provided. In addition, the refrigerating compartment is divided into two, for example, so that the cold air of the freezer compartment is independently sent as needed into the two refrigerating compartments in which the freezer compartment is divided.

Thus, the control of the cold air is performed by opening and closing the damper provided in the passage connecting the freezing compartment and the respective refrigerating compartment.

Background Art Conventionally, gas thermal bellows, solenoids, and the like have been used as opening and closing driving sources of the brakes.

If these driving sources are provided for each of the two refrigerating chambers in the divided state, the mechanical structure becomes large, it is difficult to install in a limited space, and the moving parts increase, so that the failure rate can be expected to be high.

In addition, although the response speed is slow for the former gas thermal bellows, and the device is enlarged, and the opening and closing is fast for the latter solenoid, the operation is completely performed. However, it is not suitable for this kind of driving source.

Accordingly, an object of the present invention is to provide a motor actuator capable of independently controlling at least two driven members such as brakes with one driving source.

Another object is to use a motor as a drive source, and to eliminate the drawbacks of the conventional drive means, that is, the response speed, the size of the apparatus, the generation of operation noise, and the like.

Therefore, the present invention provides a means for transmitting the rotational force of one motor to two driven members by using a cog wheel or a cam mechanism, to control their opening and closing, and furthermore to detect the rotational position of the motor and By means of signals from the two sensors, at least four operating modes can be automatically set for the two driven members using a control circuit.

Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings.

The motor actuator 1 of the present invention, as shown in FIGS. 1 to 3 as a mechanical structural part, is open and closed plates 2a and 2b as first and second driven members and their driving. The common motor 3 is provided.

The opening and closing plates 2a and 2b are freely opened and closed by shafts 4a and 4b provided at both ends of the lower side and three bearing brackets 6 integrally provided on the substrate 5. Supported

Each of the opening and closing plates 2a and 2b has packings 8a and 8b at positions corresponding to the hole inlets 7a and 7b formed in the substrate 5, and the substrate 5 The plate-shaped springs 9a and 9b fixed to each other are in contact with the substrate 5, i.e., each hole 7a and 7b is always closed.

On the other hand, the motor 3 is fixed to the mounting table 10 formed on the back side of the substrate 5 together with the gear box 11.

The gear box 11 transmits to the cams 12a and 12b while decelerating the rotation of the motor 3, and also drives the switch cam 13 assembled therein.

This switch cam 13, as shown in FIG. 4, constitutes a position detecting means together with the switch 14, and forms a high portion 13H and a low portion 13L of a central angle of 180 degrees from its outer circumference. It also corresponds to the operating modes ①, ②, ③ and ④ every 90 degrees of the center angle.

The cams 12a and 12b are cross-sectional cams, respectively, and are formed at a stagger of 90 degrees with a large cam curve as the rotational angle in the developed view as shown in FIG.

The driving pins 15a and 15b of the cams 12a and 12b are the holding holes 160a and 1 of the substrate 5.

With respect to 6b), it is maintained to slide freely in the axial direction and abuts the cam faces of the respective cams 12a and 12b at one end, and at the other end, the back of the opening and closing plates 2a and 2b. It is in contact with the side.

The rotation of one cam 12b is thus transmitted in the same direction as the gear 17 integrated with it, the idle gear 18 and the gear 19 integrated with the cam 12b, and at the same rotational speed. .

6 shows a control circuit 20 for controlling the start stop and the rotation amount of the motor 3.

The control circuit 20 includes temperature detection circuits 21a, 21b, switch circuits 22, clock output circuits 23, logic circuits 24, 25, delay circuits 26, and memory circuits. 27) and a drive circuit 28.

The temperature detection circuits 21a and 21b are for detecting the temperature of the refrigerating chamber controlled by the respective opening and closing plates 2a and 2b. The first sensor 29 and the second sensor 30 And a resistance bridge circuit including a thermistor, a comparator 31, 32, capacitors 33, 34, OR gates 35, 36 for integration.

The logic circuit 24 is also a part for determining the starting condition of the motor, subject to the output signals of the temperature detection circuits 21a and 21b, and the logic elements i.e., the NAND gates 37, 38. 50, NOT circuits 51, 52, 53, 54, capacitors 55, 58, OR gate 59, and the like.

The switch circuit 22 is a part for generating a signal of the switch 14 as a position detecting means, and for the differential connected to the integrating element 60, the waveform shaping NOT circuits 61 and 62, and a power supply or an earth source. The capacitor | condenser 63 and 64 are comprised.

The clock output circuit 23 is a portion for outputting a clock signal for setting a delay time, and is constituted by a switching transistor 65 or the like.

And the logic circuit 25,. Setting the conditions for stopping the motor 3 by using the outputs of the logic circuit 24 and the switch circuit 22 as inputs, and the NOT circuits 66, 67, 68, and 69. And NAND gates 70, 71 ... 75 and NOT circuits 76, 77, 78, and 79.

In addition, the delay circuit 26 is for setting the delay time corresponding to the rotation angle of the switch cam 13 after the start of the motor 3, the NAND gate 81, 82, AND gate ( 83, 84, 85, 86, the counter 87, the differentiating capacitor 88, and the NOT circuit 89 are configured in combination.

The logic circuit 25 and the output of the delay circuit 26 are connected to the reset input terminal of the memory circuit 27 via the OR gate 90 and the NOT circuit 91.

On the other hand, the output of the logic circuit 24 is connected to the set input terminal of the memory circuit 27 via the diode 92 and the NOT circuit 94.

This memory circuit 27 is constituted by two NAND gates 95 and 96, which are flip-flops, and NOT circuits 97 and 98, and a part of the output thereof is the NAND of the logic circuit 24. It is also possible to input one of the gates 37, 38, 39, and 40.

Furthermore, a passive set circuit 101 is provided at the set input end of the recording circuit 27 and is connected via a resistor 93.

The output of the recording circuit 27 sets the power supply circuit of the motor 3 to the on or off state by the switching transistor 99 and the triac 100 of the driving circuit 28. do.

Next, the operation of the motor actuator 1 will be described.

The operating modes ①, ②, ③ and ④ respectively correspond to the rotation angles of the switch cam 13 at 90 degrees, 180 degrees, 270 degrees and 360 degrees.

The opening and closing states of the opening and closing plates 2a and 2b at these rotation angles are as shown in the following table.

Thus, when the open / close boards 2a and 2b are in the open state, they are sent from the refrigerating chamber to the refrigerating chamber or ice-cold room, which are required for cold air.

Each internal temperature is detected by the temperature detection circuits 21a and 21b.

Now, for example, when the switch cam 13 of the position detecting means is in the rotational position at a rotation angle of 0 (360) degrees, and no cooling is required in any of the rooms, together with the temperature detection circuits 21a and 21b. "H" level output is shown.

For this reason, the outputs of the "H" level appear at the NAND gates 45, 49, and 50 DP "L" level of the logic circuit 24, and the NAND gates 46, 47, and 48. Therefore, the output of the memory circuit 27 is at the "L" level.

Therefore, the drive circuit 28 turns off the power supply circuit of the motor 3, turns off the power supply circuit of the motor 3, and stops the motor 3.

This state is the operating mode ①, and at this time, the opening and closing plates 2a and 2b are closed together.

Next, in this state, for example, when the temperature detection circuit 21a detects a temperature higher than the target temperature, the motor 3 starts automatically and opens the open / close board 2a to send cool air into the chamber.

That is, when the output of the "L" level appears on the output side of the temperature detection circuit 21a, the output circuit of the "H" level appears in the NAND gate 50 of the logic circuit 24, so that the recording circuit 27 is in a set state. The output of the "H" level is sent to the drive circuit 28 to turn on the wire circuit of the motor (3).

Due to this, the motor 3 immediately rotates and rotates the cams 12a and 12b so that only one opening / closing plate 2a is opened.

On the other hand, even if the motor 3 rotates, the switch 14 remains on. Since there is no change in the OFF state, the switch circuit 22 transmits an "L" level signal to both output terminals.

Thus, the NAND gate 72 of the logic circuit 25 outputs an "H" level output due to the "L" level inputs at both input stages, and the NAND gate 73 is attributable to different levels of input at the input stage. Since the output of the "H" level is generated respectively, the signal of the "H" level appears on the output side of the NOT circuit 69.

At this time, a signal of "H" level appears on the output side of the NAND gate 81 and a signal of "H" level is given to one of the AND gates 83, so that the clock signal of the clock output circuit 23 is delayed. Read by the counter 87.

When a predetermined time e.g., 5 seconds has elapsed, since the output of this delay circuit 26 changes from the "L" level to the "H" level, the recording circuit 27 is thus reset.

As a result, since the output of the memory circuit 27 changes to the "H" level, the drive circuit 28 immediately stops the rotation of the motor 3.

In this manner, when the rotation angle of the switch cam 13 is 90 degrees, the mother tour 3 automatically stops.

The state at this time is the operating mode ②.

When the other temperature detecting circuit 21b detects a high temperature again in the state of the operation mode 2, the logic circuit 24 sends an output signal of "H" level as described above, and the driving circuit. (28) is turned on to start the motor 3.

In this way, the open / close boards 2a and 2b are brought into the open state together, and the operating mode ③ is set.

Furthermore, at 180 degrees of rotation angle of the switch cam 13, when the switch 14 is turned off from on, an output signal of "H" level appears on the output side of the capacitor 63 for differentiation, which is a NAND gate 70. ), 71 and 74 generate a signal for setting the recording circuit 27 to the reset state.

When the temperature detection lightning passage 21a transmits the signal of the "H" level to the operation mode ③, this time, the operation mode ④ is obtained.

In this manner, when the switch cam 13 is stopped at the rotational angle of 180 degrees and 0 (360), the logic circuit 25 resets the memory circuit 27 when the switch 14 is turned on or off. It serves to stop and the motor 3 is stopped.

When the switch cam 13 is stopped at the positions of the rotation angles of 90 degrees and 270 degrees, the delay circuit 26 calculates a constant delay time after the switch 14 is turned on or off, so that the memory circuit 27 is closed. The motor is set to the reset state and the motor 3 is stopped at a predetermined rotation angle.

Of course, the switch 14 is turned on. The relative positional relationship between the off state and the switch cam 13 is not limited to the embodiment and is arbitrarily made.

In the above operation description, the operation modes ①, ②, ③, ④ are sequentially changed, but when the operation mode ① is changed from the operation mode ① to the operation mode ③, the operation mode ② is skipped.

Control of such a skipping phenomenon is performed by the logic circuit 25.

In addition, when the motor 3 is forcibly driven, the set signal is sent to the memory circuit 27 by the manual set circuit 101.

The control circuit 20 of the above embodiment, in relation to one switch 14, stops the four operating modes by operating the delay means in a portion other than its on-off position. By using two switch cams 13, the rotation angle can be detected every 90 degrees, so that the delay circuit 26 can be omitted.

In addition, setting of such a condition can be implemented not only by the control circuit 20 like the said embodiment but by other logic.

The object to be controlled is not limited to the opening and closing plates 2a and 2b, but may be two other driven members.

The present invention has the following unique effects.

Since at least four operating modes are obtained by the first and second driven members, more advanced control is possible.

Further, since each driven member is independently controlled by the first and second sensors, it is possible to set environmental conditions such as temperature for each driven member.

Moreover, since such a plurality of operating modules can be realized by one motor, the occupied space of the whole apparatus is reduced, and the product price thereof is cheap compared with the use of two motors.

Claims (1)

One motor, first and second driven members driven by the motor, position detecting means for detecting the rotational position of the motor, and first and second detecting environmental conditions such as temperature The sensor and the first driven member by a signal from the first sensor, and the second driven member by a signal from the second sensor, independently driving the motor, Motor actuator characterized in that it comprises a control circuit for stopping the motor by using the signal of.