KR900009634Y1 - Motor actuator - Google Patents

Abstract

No content.

Description

Motor actuator

1 is a perspective view showing the mechanical structure of the apparatus to which the present invention is applied and some elements of the present invention.

2 is a side view of the apparatus of FIG.

3 is a first embodiment of a temperature sensing circuit.

4 is a first embodiment of a control circuit which is a motor actuator of the present invention.

5 and 6 show second and third embodiments of control circuits.

7 and 8 show yet another arrangement for the delay circuit used in the embodiment of FIG.

9 shows a second embodiment of a temperature sensing circuit and a fourth embodiment of a control circuit.

10 is an enlarged view of the cam / limit switch combination employed in the present invention.

11 and 12 show fifth and sixth embodiments of the control circuit.

13 is another arrangement for the delay circuit used in the embodiment of FIG.

14 shows the cam / limit switch device and its control relative to a damper constituting an application of the present invention.

15 and 16 show another cam / limit switch device.

17 and 18 show another arrangement of the temperature detection / control circuit combination to be used with the cam / limit switch combinations of FIGS. 14-16.

19 and 20 show different elements of another damper device to which the present invention is applied.

21A and 21B show an optional contour of the cam end shown in FIG. 20.

22 is an overall schematic diagram showing that the motor is controlled according to the output of the temperature sensor and the position of the limit switch.

23 is a more detailed view of the cam device of FIG. 20. FIG.

* Explanation of symbols for main parts of the drawings

1,101,201: motor actuator 2,102: damper

3, 203: motor 4: support shaft

5: frame 6: outlet

7,107,108,212: cam 8: eccentric pin

9,214: Switch 10: Home

11: temperature sensing circuit 12,112,116: AC power

13: power source circuit 14, 120: thermistor

17,121: variable resistor 20,123: comparator

27,114,217: control circuit 28,60,124: EX-OR circuit

30,31,40,55,57: NAND circuit 41,58: flip-flop

50,125: switch transistor 52,115: triac

65, 79: delay means 103: arm

105: cold air passage 107a, 107b, 108a: protrusion

110,111: limit switch 202: opening and closing

205: substrate 207: opening

208: packing 209: leaf spring

211: gearbox 212: cam

213: switch cam 214: switch

215: driven pin

The present invention relates to a motor actuator for controlling this of the motor drive member depending on conditions such as temperature.

For example, in a refrigerator apparatus having a freezer compartment and a refrigerator compartment separated from each other, cold air in the freezer compartment is supplied to the inside of the refrigerator compartment. Cold air supply is controlled by opening and closing the damper located in the passageway connecting the freezer compartment and the cold compartment. That is, the motor actuator is used to open and close the damper.

When the motor actuator is turned on and off depending on the temperature of the refrigerator compartment, the motor actuator may malfunction if the temperature set in the refrigerator compartment changes during operation. Thus, limited control functions are required to adapt to changes in external conditions during operation.

Moreover, in order to embody this function, it is necessary for the damper open and closed states to be used as input information.

Accordingly, an object of the present invention is to provide a motor actuator capable of preventing a malfunction by adopting the position of a drive member such as a damper to be controlled together with other data such as temperature as an input condition.

Another object of the present invention is to obtain a stable characteristic for the motor actuator by using an AC motor having an anti-back mechanism to prevent likely reverse rotation with the start of operation.

Another object of the present invention is to make it possible to open and close a plate such as a damper regardless of the driving position of the motor.

Another object of the present invention is to eliminate the drawbacks in the drive means such as low response speed, large size of the mechanism and noisy operation caused by using the motor as the drive source.

In view of the above and other objects, according to the present invention, a damper or its associated with the signal level and the signal level related to the opening and closing positions of the damper or such a drive member are used as input conditions for the control means. The same drive member can be opened or closed in response to changes in temperature conditions or the like. Positional control will continue even if the set temperature changes abruptly during such control.

After the state of the switch is changed, the motor is stopped by delaying the signal from the switch means for longer than a predetermined time period. Thus, even if the motor makes a temporary rotation in reverse with the subsequent restart of the motor, the switch does not repeat unnecessary ON-OFF operations and does not have an uncertain state during the reverse rotation. This makes it possible to prevent the malfunction of the control means.

Malfunctions occurring when the motor is stopped can be clearly prevented by ignoring the stop signal from the switch means (such as the cam and the switch) over a predetermined time interval. The ignore of the stop signal is performed by delaying the external motor driving signal in a delay circuit or the like, using the delay signal as one condition and allowing the stop signal to pass through the logic element as another condition. Therefore, even if the motor makes a temporary rotation in reverse with the restart and the switch repeats unnecessary ON-OFF operations during the reverse rotation correction period, the control operation does not have any unstable state, thereby preventing malfunction of the control means. will be.

Moreover, according to another embodiment of the present invention, a switch means using a relatively inexpensive AC motor, for example, an AC motor having a reverse rotation prevention mechanism, comprising two cams and two switches By detecting the rotation amount of the motor and combining it with the motor driving external signal as another condition, the motor can be driven accurately by a predetermined rotation amount.

As an additional feature, the opening and closing plate is elastically biased by the force which is opened or closed by the spring and the opening and closing operation is made by the motor driving the cam mechanism.

When the present invention with reference to the accompanying drawings in more detail.

For example, one embodiment of the present invention is applied to a motor actuator 1 for use in a refrigerator. 1 and 2 show the mechanical structure of the motor actuator 1. The movable object, such as the damper 2 to be controlled, is driven by a motor 3 with a speed reducer. The plate-shaped damper 2 is rotatably supported at one end on the support shaft 4 and is connected to the support shaft 5 by means of which the outlet 6 can be opened and closed.

The motor 3 is fixed to the side of the frame 5 so that the cam 7 and the eccentric piece 8 can be rotated by the power shaft 3a. The cam 7 has a semicircular contour with two different radii. The contour of the cam face controls the on-off operation of the switch 9. It is turned off when the damper 2 of the switch 9 is closed and turned on when the damper 2 is opened. The eccentric pin 8 is fitted to the side of the groove 10 formed on the side of the damper 2 and transfers the joint motion to the damper 2 and converts it into a swing motion for opening and closing.

3 shows the temperature sensing circuit 11 as a first means for sensing the temperature in the refrigerator and for generating the driving precondition signal A according to the temperature condition. An AC power source 12 is connected to the power source circuit 13. The output of the power source circuit 13 is connected to a bridge circuit composed of a demister 14, a resistor 15, a resistor 16, a variable resistor 17 and a resistor 18, 19, and also an input. As a comparator 20, to which a change in the balance voltage of the bridge circuit is applied, resistors 21, 22 and capacitor 23 are provided in succession. One end of the capacitor 23 and one end of the AC power supply 12 form power source terminals 24 and 25, respectively, and the other end of the capacitor 23 connected to the output of the comparator 20 is a preliminary driving condition. The output terminal 26 of the signal A is formed.

4 shows a control circuit 27 for the motor 3. The output terminal 26 described in FIG. 3 becomes one input of the EX-OR circuit 28 and is also connected to one input terminal of the NAND circuit 30 through the inverter 29. Terminal 26 is also connected to one input terminal of NAND circuit 31.

The power source terminal 24 is also connected to ground 35 via resistors 32, 33 and capacitor 34, and also the same ground via switch 9, capacitor 36 and resistor 37. Is connected to. The switch 9 is a second means for generating the stop precondition signal B by its on-off operation. The terminal of the capacitor 34 on the side of the resistor 32 is connected to another input terminal of the NAND circuit 30 via the inverter 38 and of the capacitor 36 on the side of the resistor 37. The terminal is connected to another input terminal of the circuit 31 via two inverters 27 and 39. The output terminals of the NAND circuits 30 and 31 are connected to the inputs of the NAND circuit 40, respectively, and the output terminals of the NAND circuit 40 are connected to the reset input terminals of the flip-flop 41 as storage (latch) means.

The output terminal of the EX-OR circuit 28 is connected to the ground 35 via the differential capacitor 42 and the resistor 43, and is also connected to the set input terminal of the flip-flop 41 via the inverter 44. Connected. The output terminal of the flip-flop 41 is connected to the inverter 45 and one end of the resistor 46 and the other end of the resistor 46 is connected to the ground 35 through the integrating capacitor 47, and also the inverter ( 48 is connected to the base of the switching transistor 50 via a resistor 49. Here, the capacitor 47 and the resistor 46 constitute a main part of the present invention, and have a delay having a time constant sufficient to delay the drive signal C by at least a time period equal to the maximum reverse rotation time of the motor 3. The means 65 are formed.

Transistor 50 has two different terminals connected with resistor 51 between the gate of triac 52 and ground 35. The triac 52 is connected in series with an AC motor 3 between the power terminals 24 and 25. Further, the inverter 44 may be included in the flip flop 41.

The operation of the above described motor actuator 1 will now be described.

The temperature in the refrigerator can be set by adjusting the resistance value of the variable resistor 17. The split voltage derived therefrom is applied to the non-inverting input of the comparator 20.

(a) When the temperature in the refrigerator rises, the resistance value of the demister 14 decreases to increase the voltage at the inverting input terminal of the comparator 20. When the voltage exceeds the input voltage at the non-inverting input terminal, it changes in the drive precondition signal A at the output terminal 26.

In this case, a low level pulse is input to the set input terminal of the flip-flop 41 because the output of the switch 9, i.e., the stop precondition signal B, is at a high level when the movable member, that is, the damper 2 is closed, is at a high level. do. Thus, flip-flop 41 is set and a high level signal appears at its output terminal. The signal is delayed by the appropriate delay time set by the inverters 45 and 48 and the capacitor 47 and applied to the base of the transistor 50 and the transistor 50 is conducted. This causes the triac 52 to conduct, and the motor 3 is driven to open the damper 2. When the damper 2 is open, the output of the switch 9 is inverted from a high level to a low level, thereby outputting a low level pulse so that the flip-flop 41 is reset so that the output terminal of the NAND circuit 40 at the leading edge of the pulse is reset. Is entered. Therefore, since the transistor 50 and the triac 52 are both cut off, the motor 3 immediately stops.

If the damper 2 is opened when the temperature in the refrigerator rises, the output of the switch 9 is at the low level, so no low level pulse is input to the set input terminal of the flip-flop 41 and thus the flip-flop 41 is set. It doesn't work. Thus, the motor 3 does not rotate and the damper 2 remains open.

(b) When the temperature in the refrigerator drops below the set value, the resistance value of the thermistor 14 rises and the input voltage at the inverting input terminal of the comparator 20 decreases. When the input voltage decreases below the voltage at the non-inverting input terminal, the signal level of the drive precondition signal A at the output terminal 26 changes from low level to high level.

In this case, if the damper 2 is open, the low level pulse is input to the set input terminal of the flip-flop 41 because the input from the switch 9, that is, the stop precondition signal B is at the low level. Flip-flop 41 is set. In this way the motor 13 closes the damper 2 as described above. When the damper 2 is closed, the output from the switch 9 is switched from low level to high level.

The flip-flop 41 is reset by detecting the rise of the high level pulse and simultaneously outputting the low level pulse from the output terminal of the NAND circuit 40. This causes the transistor 50 and the triac 52 to shut off and the motor 3 automatically stops.

If the damper 2 is closed when the temperature in the refrigerator is lowered, since the output from the switch 9 is at a low level, no low level pulse is input to the set input terminal of the flip-flop 41 and the flip-flop 41 is It is not set. Thus, the motor 3 does not rotate, and the damper 2 remains closed.

(c) When the temperature in the refrigerator maintains a certain level, the voltage at the non-inverting input of the comparator 20 gradually decreases when the set temperature is lowered by adjusting the variable resistor 17. When this input voltage is lower than the input voltage from the thermistor 14, the output from the comparator 20 changes from high level to low level. If the damper 2 is closed at this time, the damper 2 is opened as when the temperature in the refrigerator in the case of the electrical limit (a) rises. Optionally, if the damper 2 is open at this point, the flip-flop 41 is not set and thus remains open.

(d) Also, when the temperature in the refrigerator is maintained at a constant level and the set temperature is to be increased by adjusting the variable resistor 17, the input voltage at the non-inverting input of the comparator 20 gradually increases.

When the input voltage exceeds the input of the thermistor 14, the output of the comparator 20 changes from low level to high level. If the damper 2 is open at that time, the flip-flop 41 is set and the motor 3 causes the damper 2 to close. When the damper 2 is closed, the flip-flop 41 is not set and the damper 2 remains closed.

In this manner, the increase or decrease of the temperature in the refrigerator relative to the set temperature value is sensed by the rise or fall of the comparator 20 output to control the ON-OFF state of the motor 3. The open or closed position of the damper 2 is converted to the stop precondition signal B by the cam 7 and the switch 9, and the change of the damper 2 from open to closed or from closed to open is changed to the switch 9 Is sensed by the rising or falling of the output pulse from the control panel to control the stop of the motor 3. Whether the stop preliminary condition signal B for the motor 3 occurs on the rising or falling of the output from the switch 9 is determined depending on the present temperature lower or higher than the set value in the refrigerator.

Another embodiment of the control circuit 27 is shown in FIG. The output terminal 26 of the temperature sensing circuit 11 passes through the inverters 53 and 54 and is an input terminal of the NAND circuit 55 or one input terminal of the NAND circuit 57 through the inverter 56. Connected. The output terminals of the NAND circuits 55 and 57 are connected to the set input terminal and the reset input terminal of the flip-flop 58, respectively. In addition, the output terminal of the inverter 54 is connected to the input terminal of the inverter 53 through the resistor 59. The switch 9 and the resistor 33 are connected in series between the power supply terminal 24 and the ground 35.

The output terminal of the flip-flop 58 and the connection point between the switch 9 and the resistor 33 are respectively connected to the input terminal of the EX-OR gate 60. The output terminal of the EX-OR gate 6 is connected to one end of the resistor 61.

The other end of resistor 61 is connected to ground 35 via an integrating capacitor 62 and also via a resistor 49 in the same manner as in the previous embodiment via inverters 63 and 64. 50) is connected to the base. The output terminal of the inverter 63 is also connected to the other input terminals of the NAND circuits 55 and 57.

Since the signal level from the switch 9 is configured to be supplied to only one input terminal of the EX-OR gate 60, the output of the inverter 63 is in the state of the switch 9 and the set of flip-flops 58 or Under the reset condition and addition, the flip-flop 58 is input in accordance with the output signal from the temperature sensing circuit 11 in this embodiment. The same operation as the above example can be obtained in this embodiment.

Moreover, even if all necessary conditions are set by the logic circuits in each embodiment, this operation may be formed by one one-chip microprocessor 66 having the same function as shown in FIG.

Although the switch 9 is opened and closed by the connection of the cap 7 with it in this embodiment, the switch 9 can be replaced by a photo switch or other similar proximity switch. Furthermore, in the above embodiment there are two driving positions corresponding to the opening and closing operations, but there may be any number of positions that can be selected, for example three possible positions (fully open, half open and fully closed) or more. have.

Moreover, the object to be controlled by the present invention is not limited to the refrigerator at all, but may be used as, for example, a damper control device for an automobile air conditioner. In addition, the signal used as the drive reserve condition signal A may need to be related not only to the sensed temperature, but to the amount of frost attached, for example.

Further, although the delay means 65 is an RC time constant circuit in the above embodiment, the delay means 65 may be configured as shown in FIGS. 7 and 8, wherein the reference oscillation signal D ₁ (seventh) Or the frequency of the AC signal D ₂ (Fig. 8) is calculated for each output from the flip-flop 41 or the EX-OR circuit 60 by a counter (counter), and the drive signal C has any delay. It can be configured to occur when a calculated value that matches time is reached.

Moreover, the delay means is located at the rear end of the flip-flops 41 and 89 in the above-described embodiment but may also be located at the input side of the flip-flops 41 and 58, i. Or at least in the proper position in the transmission path for the stop signal B.

The description will be made as to prevent a malfunction in the start of the motor operation. FIG. 9 shows a temperature sensing circuit 11 for sensing the temperature in the refrigerator and a control circuit 27 for controlling the AC motor 3 to make an external signal A for driving the motor according to the temperature condition. have.

The demister 14 and the variable resistor 17 of the temperature sensing circuit 11 together with the other resistors 15, 16, 18, and 19 constitute a bridge circuit between the power supply terminal 24 and the ground 35. Comparator 20 is connected to other resistors 21, 22, 73 as shown in the figure. The output of the comparator 20 forms an output terminal 26 for the external signal A.

The output terminal 26 is connected to one input terminal of the EX-OR circuit 28, and is also connected to one input terminal of the NAND circuit 30 through the inverter 29, and one of the NAND circuit 31. It is directly connected to the input terminal.

The power supply terminal 24 of the switch means is connected in series with the switch 9 and the resistor 33 to ground 35, and one end of the switch 9 connected to one end of the resistor 33 has a capacitor 36 And the resistor 37 are connected to the same ground 35, and also to the power supply terminal 24 via the capacitor 34 and the resistor (32). The switch 9 generates a stop signal B in accordance with the state.

Capacitors 34 and 36 connected to one side of the resistors 32 and 37 are connected to the other input terminal of the NAND circuit 30 through the inverter 38 and through two inverters 27 and 39. It is connected to the other input terminal of the NAND circuit 31, respectively. The other end of the capacitors 34 and 36 is connected to the other input terminal of the EX-OR circuit.

The output terminals of the NAND circuits 30 and 31 are connected to the individual input terminals of the 2-input NAND circuit 40, and the output terminals of the NAND circuit 40 are stored via the AND circuit 84 and the inverter 25. It is connected to the reset input terminal of the RS flip-flop 41 as a means.

The output terminal of the EX-OR circuit 28 is connected to one end of the differential capacitor 42, and the other end thereof is connected to the ground 35 through the resistor 43, and also via the inverter 44. It is connected to the set input terminal of the flip-flop 41. The output terminal of the flip-flop 41 is connected to the base of the switching transistor 50 via the inverters 45 and 48.

The output of the inverter gear 45 is connected to the other input terminal of the AND circuit 84 described above via the delay circuit 79 and the inverter 83.

The AND circuit 84 and the delay circuit 79 constitute the main part of the present invention, i.e., the delay circuit integrates with the resistor 46 to delay the stop signal B for a predetermined time interval T1 after the start of the AC motor. The capacitor 47 is included. The time T1 must be longer than the maximum time required for the motor to rotate in the forward direction after the motor rotates in the reverse direction and must be longer than the time interval T2 required to change the state of the switch 9. This relationship is represented by the angle of rotation of the cam 7 as shown in FIG.

Transistor 50 is coupled with resistor 51 between the gate of triac 52 and ground 35. The triac 52 is connected in series with the AC motor 44 between the pair of power supply terminals 24 and 24.

In addition, the inverters 44 and 25 may be included in the flip-flop 41.

Another embodiment of the control circuit 27 is shown in FIG. The output terminal 26 of the temperature sensing circuit 11 is connected in series with the inverters 53 and 54, which are directly connected to one input terminal of the NAND circuit 55 and also via the inverter 56 to the other NAND. It is connected to one input terminal of the circuit 57. The output terminals of the NAND circuits 55 and 57 are connected to the set input terminal and the reset input terminal of the flip-flop 41, respectively. The output terminal of the inverter 54 is connected to the input terminal of the inverter 53 through the resistor 80. The output terminal of the flip-flop 41 is connected to the delay circuit 79 via the inverter 82 and to the EX-OR gate 60. The connection point between the switch 9 and the resistor 33 is connected to the other input terminal of the EX-OR gate 60 via the AND circuit 84. The output terminal of the other EX-OR gate 60 is connected to the base of the transistor 50 in the same form as the above-described circuit via the inverters 63 and 64. The output terminal of the inverter 63 is connected to the other input terminal of the NAND circuits 55 and 57, respectively.

In this embodiment, since the level of the stop signal B from the switch 9 forms only one input of the EX-OR gate 60, the input condition for the flip-flop 41 is ON- of the switch 9. An output from the inverter 63 determined by the OFF state and the set or reset state of the flip-flop 41, and an output signal from the temperature sensing circuit 11. The very same function as in the above-described embodiment can be obtained in this embodiment.

Further, although all the required conditions are set by the logic circuit in the electric embodiment, this function can also be achieved by the one-chip microcomputer 66 as shown in FIG. In this case, the constant time period T1 is set by a program in the one-chip microprocessor 66.

Moreover, in the above embodiment, even if the delay circuit 79 is a time constant circuit, the delay circuit 79 can be configured as shown in FIG. 13, where the frequency of the reference oscillation signal D1 is set to when the stop signal is input. The stop signal B appears when the calculated value coincides with the constant time interval T1.

An embodiment for preventing malfunction by using two switches and two cams will now be described. 14 shows an object such as a damper 102 controlled by the motor actuator 101.

The damper 102 is supported on the upper end of the arm 103 so as to be rotatable about the fixed shaft 104 and is opposed to the opening of the cold air passage 105 so that the opening can be opened and closed. The elongated hole 106 is formed in the center part of the arm 103. As shown in FIG. The pin 109 formed on either of the cams 107 and 108 is loosely fitted into the hole.

The cams 107 and 108 together with the corresponding limit switches 110 and 111 constitute first and second switch means, respectively. The cams 107 and 108 are fixed to the power shaft 113 of the AC motor 112 of the form which rotates in one direction.

The cam 107 has two opposite projections 107a and 107b as shown in FIG. The switch 110 is closed when any one of the protrusions contacts the corresponding limit switch 110.

Another cam 108 has a semicircular projection 108a as shown in FIG. The limit switch 111 is turned on when the protrusion 108a is in contact with the limit switch 111.

The control circuit 114 is shown in FIG. The AC motor 112 is connected to the AC power source 116 in series with the triac 115. The limit switch 110 is connected in parallel with the triac 115. The control circuit 114 commonly uses one of the power lines, where the limit switch 111 and the series connection of the resistor 118, the series connection of the resistor 119 and the thermistor 120, and the variable resistor 121. ) And a series connection of the resistor 122 are connected in parallel with the DC power supply 117, respectively.

Resistor 119 and 122, thermistor 120 and variable resistor 121 constitute a bridge circuit, the output point of which is connected to the individual input terminals of comparator 123. The connection point between the output terminal of the comparator 123, the limit switch 11, and the resistor 118 is connected to the input terminal of the EX-OR gate 124 as signal generation means, respectively. The output terminal of the EX-OR gate 124 is connected to the base of the switching transistor 125 and is connected in series through a resistor 126 between the gate of the triac 115 and the cathode of the DC power source 117.

The operation of the motor actuator 101 will now be described. As already described above, the limit switch 110 is otherwise opened when contacted with the protrusions 107a and 107b. Thus, when the projections 107a and 107b are not in contact with the limit switch 110, the AC motor 112 rotates in its own holding state irrespective of the output signal from the control circuit 114 from the control circuit 114. do. The limit switch 111 also supplies a high level signal to one of the inputs of the EX-OR gate 124 when in contact with the protrusion 108a.

The comparator 123 senses a change in the temperature level, that is, the voltage divided by the variable resistor 121 and the resistor 122, that is, the resistance value of the demister 120 with respect to the reference value. Occurs. Signal A becomes a low level signal when the temperature is high and becomes high level when the temperature is low.

The pin 109 must be located on the left side of FIG. 14 to open the damper 102 when the temperature is high and the motor drive external signal A is at a low level. In this case, since the limit switch 111 is closed, the output signal B of this switch 111 is at a high level.

Since the motor drive external signal A is at a low level and the signal from the limit switch 111 is at a high level, the EX-OR gate 124 generates a high level signal as the drive instruction signal C. Thus, the transistor 125 and the triac 115 become conductive, whereby the AC motor 112 starts to rotate and the damper 102 is opened.

When the limit switch 110 is opened, current is supplied to the AC motor 112. When the limit switch 111 is pushed in the middle and the contact is opened, the signal B from the limit switch 111 becomes low level.

Here, since the output from the comparator 123 is at the low level and the signal from the limit switch 111 is also at the low level, the limit switch 111 remains open even though the triac 115 is turned off. In the holding state, the AC motor 112 rotates.

When the protrusion 107b is in contact with the limit switch 110, the limit switch 110 is closed, so the AC motor 112 stops for the first time at this point. This state is the same as when the output from the comparator 23 is at a high level.

In the above operation, when the output signal from the comparator 123 changes from the low level to the high level during the rotation of the AC motor 112, the cams 107 and 108 rotate 360 ° by 14 degrees without stopping at the intermediate point. Stop in the state shown.

18 is another illustration of the alternating current motor motor 112 controlled only by the on-off state of the triac 115. In this embodiment, the limit switch 110 is connected in series with the resistor 127, and their connection point is connected to one input terminal of the EX-OR gate 124. One input terminal of the OR gate 128 is connected to the output terminal of the EX-OR gate 124, and the other input terminal thereof is connected to the connection point between the limit switch 111 and the resistor 118. The output terminal of the OR gate 128 is connected to the base of the transistor 125 via the resistor 129.

When the limit switch 110 is opened, a high level output is always obtained by the function of the OR gate 128 to provide a self-holding state.

The other operation is the same as in FIG.

An embodiment with another improved structure of the motor actuator is described. As shown in FIG. 19 and FIG. 20, the motor actuator 201 of this embodiment is the closing and opening plate 202 as a member which can be moved by a joint, below the shaft bearing receiver 206 of the board | substrate 205. As shown in FIG. It is rotatably supported by 204 located at both ends at. The opening and closing plate 202 is placed in a position corresponding to the opening 207 and has a member 208 slightly larger than that. The opening and closing plate 202 is elastically biased by the leaf spring 209 fixed to the substrate 205 in the direction in which the opening and closing plate 202 is in contact with the substrate 205, that is, the direction in which the opening 207 is kept closed. .

The motor 203 is fixed to the fixing block 210 formed on the rear surface of the substrate 205 together with the gear box 211. The gearbox 211 which transmits the decelerated rotation of the motor 203 to the cam 212 includes a switch cam 213 and a switch 214 as shown in FIG. 22.

The cam 212 has a cam end face 212a if it is an end face cam. As shown in FIG. 21A, the cam end surface 212a has a convex shape. In particular, as shown in FIG. 21B, the cam cross section 212a has a flexible curved shape.

The driven pin 215 of the cam 212 is in contact with the rear face of the plate 202 whose one end is in contact with the cam end face 212a and the other end is opening and closing, while in the retaining hole 216 in the substrate 205. It is slidably in the direction from.

As shown in FIG. 22, the motor 203 is designed to be controlled by the control circuit 217. The control circuit 217 uses the position of the opening and closing plate 202, that is, the position of the switch 24 and the change of the signal level from the temperature sensor 217 as an input condition, while the on-yop state of the motor 203 is used. Control automatically.

The operation of the motor actuator 202 will now be described. When the temperature in the refrigerator rises and the open / close plate 202 closes the opening 207, the control circuit 217 receives the signal from the temperature sensor 218 to start the motor 203 and rotate the cam 21 to 180 degrees. Rotate). In this case, the driven pin 215 is moved to the left in FIG. 20 along the inclination of the cam section 212a to push the opening and closing plate 202 against the elasticity of the spring 209 to open the opening 207. Expose On the other hand, since the switch cam 213 is rotated to turn on the switch 214, the control device 217 opens and closes the closing plate 202 to automatically stop there. Here, cold air from the cooler is supplied into the refrigerator through the opening 207.

When the temperature in the refrigerator falls below a predetermined temperature, the control circuit 207 receives the signal from the temperature sensor 218 as an input and gathers it again while confirming the open state of the opening and closing plate 202 by the state of the switch 214. The rotor 203 is rotated. At 180 degrees of rotation of the cam 212, the driven pin 115 moves to the right in FIG. 20, and the opening and closing plate 202 pushes the packing 208 against the opening 207, thereby causing the spring ( The opening 207 is closed by the elasticity of 209.

Although the opening and closing plate 202 is conveniently closed by the spring 209 in the above embodiment, the spring 209 may optionally be made to open and close the opening and closing plate 202. In this case, the cam 212 and the driven pin 215 are driven to open and close the plate 202 so that the opening 207 is closed. In addition, the spring 209 may be a torsion spring or a coil spring connected to the 204 instead of requiring only a leaf spring.

Moreover, as shown in FIG. 23, the cam 212 can be a cylindrical cam and a portion of the driven pin 215 is engaged with a groove therein.

Although the motor actuator 201 of the present invention is integrated and used in the refrigerator, a cooling and heating device or a blower may be applied in the form as shown in FIGS. 1 and 2.

Claims (11)

The motor 3, the damper 3 which is arranged to open and close the outlet 6 and is opened and closed by the rotation of the motor 3, and the motor to detect the rotational position of the motor 3 The cam 7 connected to the power shaft of the rotor 3 and the switch 9 which allows the on-off to be controlled by the contour of the cam, and the temperature at which an external condition such as temperature is sensed and a signal is generated according to the temperature condition. Drive control of the motor 3 so that the open / close state of the damper 2 becomes a predetermined state according to the sensing circuit 11 and the signal from the temperature sensing circuit 11 and the input signal from the switch 9. A motor actuator comprising a control circuit means (27). The motor (3) according to claim 1, wherein the motor (3) is composed of an AC motor having a reverse rotation prevention mechanism that corrects the direction of rotation when the motor (3) rotates in reverse, and which delays the stop signal of the motor (3). And a delay means (65), wherein the delay time is set to be equal to or greater than the maximum reverse rotation time of the motor. 2. The motor (3) according to claim 1, wherein the motor (3) is composed of an AC motor having a reverse rotation prevention mechanism that corrects the direction of rotation immediately after the rotation (3), and the motor (3) after starting the motor (3). A second delay means (79) for ignoring the stop signal (B) for a predetermined time interval (T1), the fixed time being greater than or equal to the maximum reverse rotation time of the motor (3) and the state of the switch (9). Motor actuator, characterized in that set to be less than the time (T2) required to change. 2. The motor of claim 1, wherein the motor is attached to the frame so as to be positioned opposite to the damper with the frame interposed therebetween, the cam being rotationally driven by the motor, and the cam surface of the cam contacting the damper and transmitting the movement in the open / close direction to the damper. A motor actuator comprising a driven pin to be fixed to the frame and a leaf spring for elastically biasing the damper. 2. The motor actuator according to claim 1, wherein the control circuit means (27) consists of a one-chip microprocessor. 4. The motor actuator according to claim 3, wherein the first delay means (65) is constituted by an RC circuit. 4. The motor actuator according to claim 3, wherein the first delay means (65) includes counter means for calculating a pulse according to a reference oscillation signal having a predetermined frequency. 5. The motor actuator according to claim 4, wherein the second delay means is constituted by an RC circuit. 5. The motor actuator according to claim 4, wherein the second delay means (79) comprises counter means for calculating a pulse according to a reference oscillation signal having a predetermined frequency. 6. The motor actuator according to claim 5, wherein the leaf spring (208) biases the damper (202) in a direction in which the frame opening (207) is kept closed. 6. The motor actuator according to claim 5, wherein the leaf spring (209) biases the damper (202) in a direction in which the frame opening (207) is kept open.