JP4305204B2 - Geared motor and its control device - Google Patents

Description

  The present invention relates to a geared motor mounted on a device such as a fully automatic washing machine and a control device therefor.

  Conventionally, in a fully automatic washing machine, there is a method of improving washing performance by allowing the washing / dehydrating tub to freely rotate when washing is too easy, and preventing fabric damage and washing unevenness (see Patent Document 1, for example). .

For this purpose, it is common to use a geared motor that pulls in two stages in switching between a clutch device including a dewatering shaft connected to a washing and dewatering tub and a washing shaft connected to a pulsator. This geared motor is rotated by a built-in motor and has two output cams that are coaxially connected with different circumferential radii, a double contact that turns the relay contact on and off by rotation of this cam, and this double contact (For example, refer to Patent Document 2).
JP-A-8-57187 Japanese Patent Laid-Open No. 9-253387

  However, in such a conventional geared motor configuration, the geared motor requires a large number of external connection terminals, and there is a problem that the drive circuit is complicated and expensive, such as using two track tracks.

  Another problem is that the expected operation of the device may not be obtained because the microcomputer side cannot confirm whether the pulling stroke (rotation angle) has reached a predetermined position.

  Furthermore, if the number of contacts is increased in order to detect a large number of rotation angles of the output lever, there is a problem that the number of external connection terminals and corresponding input circuits also increases.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a geared motor that is inexpensive and has good controllability, and a control device therefor.

  In order to solve the above-described conventional problems, the geared motor of the present invention includes a motor, a speed reduction mechanism that reduces the rotational force of the motor and transmits it to the output shaft, and reverse rotation prevention that restricts the output shaft to one-way rotation. A mechanism, a cam coupled to the output shaft, a plurality of contacts opened and closed by the cam, a common external connected in common to all one side of the terminal of the contact and one terminal of the motor Even if the number of contacts increases to detect a large number of rotation angles, it can be configured without increasing the number of external terminals and connecting wires by bringing together one side terminal of each contact.

  In the geared motor control device of the present invention, the common external terminal of the geared motor of the first invention is connected to the power source, and is connected to the other terminal of each contact and detects the open / closed state of the contact. Provided is a geared motor control device having good controllability according to the rotation angle of the output shaft, which controls energization to the geared motor according to the output of the detection circuit. Can do.

  The geared motor of the present invention is connected to the motor, a speed reduction mechanism that reduces the rotational force of the motor and transmits it to the output shaft, a reverse rotation prevention mechanism that restricts the output shaft to rotate in one direction, and the output shaft. And the first external terminal connected in common to one terminal of the first contact and one terminal of the motor A second external terminal commonly connected to the other terminal of the first contact and one terminal of the second contact, and a third connected to the other terminal of the second contact. Even if the number of contacts increases to detect a large number of rotation angles, the external terminals can be shared without increasing the number of external terminals and connecting wires.

  In the geared motor control device according to the present invention, a resistor is electrically connected between the second external terminal and the third external terminal of the geared motor according to the third invention. A detection circuit for detecting the open / closed state of the contact and controlling the geared motor according to the output of the detection circuit, and detecting the rotation angle of the output shaft from the open / closed state of the first and second contacts The circuit is simplified, and a space-saving and inexpensive geared motor control device can be provided.

  The geared motor and the control device thereof according to the present invention can be configured to stop and hold the output shaft at a plurality of rotation angles easily and inexpensively.

  The first invention includes a motor, a speed reduction mechanism that reduces the rotational force of the motor and transmits it to the output shaft, a reverse rotation prevention mechanism that restricts the output shaft to one-way rotation, and a rotation connected to the output shaft. And a plurality of contacts that are opened and closed by the cam, a common external terminal that is commonly connected to all of one side of the terminal of the contact and a terminal of the one side of the motor. Even if the number of contacts increases in order to detect this, it can be configured without increasing the number of external terminals and connecting wires by bringing together one side terminal of each contact.

  The second invention includes a plurality of detection circuits for connecting the common external terminal of the geared motor of the first invention to a power source, and connected to the other terminal of each contact and detecting the open / closed state of the contact. And controlling the energization to the geared motor according to the output of the detection circuit, and can provide a control device for a geared motor with good controllability according to the rotation angle of the output shaft.

  According to a third aspect of the present invention, there is provided a motor, a speed reduction mechanism that reduces the rotational force of the motor and transmits it to the output shaft, a reverse rotation prevention mechanism that restricts the output shaft to one-way rotation, and a rotation connected to the output shaft A first cam and a first external terminal connected in common to one terminal of the first contact and the one terminal of the motor; A second external terminal connected in common to the other terminal of the first contact and one terminal of the second contact; and a third external terminal connected to the other terminal of the second contact Even if the number of contacts increases to detect a large number of rotation angles, the external terminal can be shared without increasing the number of external terminals and connecting wires.

  In a fourth aspect of the invention, a resistor is electrically connected between the second external terminal and the third external terminal of the geared motor of the third aspect of the invention to detect the open / closed state of the first and second contacts. A detection circuit that controls the geared motor according to the output of the detection circuit, the detection circuit for detecting the rotation angle of the output shaft from the open / closed state of the first and second contacts is simplified, A space-saving and inexpensive geared motor control device can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a plan view of a geared motor according to Embodiment 1 of the present invention, and FIG. 2 is an exploded perspective view of the geared motor.

  In FIG. 1, reference numeral 1 denotes a geared motor, and an output lever 2 connected to the output shaft 9 rotates in one direction by energizing the motor 7. Reference numeral 6 denotes an external terminal electrically connected to a control device 15 described later. The output lever 2 is connected through a connecting rod 3 so as to operate a clutch lever 4 built in the washing machine around a fulcrum 5. At this time, by moving the output lever 2 to a plurality of rotation angles θ1 and θ2, the clutch lever 4 can be operated with a two-stage stroke to switch the washing machine to different operation modes.

  In FIG. 2, the rotating shaft 7a of the motor 7 rotates by energizing the terminal 7b. The rotating shaft 7a of the motor 7 decelerates the motive power of the motor 7 to the output shaft 9 and amplifies and transmits the torque to the output shaft 9 via a speed reduction mechanism comprising speed reduction gears 8a and 8b and a gear portion 9a provided on the output shaft 9. An output lever 2 for operating the connecting rod 3 is connected to the output shaft 9. The output shaft 9 has a shaft 9b having a slit 9c on which an end of a coil spring (not shown) can be mounted. The end of the coil spring of the reverse rotation preventing mechanism 13 for preventing reverse rotation is associated with the slit 9c. Are arranged to match.

  Further, a cam 10 is integrally connected to the output shaft 9, and unevenness is provided in accordance with the stop angle of the output lever 2. The contact 11 is opened and closed by the rotation of the cam 10 (the time chart will be described later). The terminal 11c of the contact 11 is connected to the external terminal 6 together with the motor terminal 7b.

  As described above, the present embodiment does not include a complicated clutch element such as a relay or a meshing method, and when holding the pulling force of the output shaft 9, The motor 7 is turned off, and an external terminal 6 connected to a terminal of a contact 11 that is opened and closed by a rotating cam 10 connected to the output shaft 9 is provided, and the external terminal 6 is set according to the rotation angle of the output shaft 9. Are configured to output an ON / OFF signal. Therefore, it is possible to provide a geared motor that can be stopped and held in a plurality of stages in a simple and inexpensive manner.

  In the present embodiment, two reduction gears 8a and 8b are used as the reduction gears. However, the combination can be appropriately changed in order to obtain a required rotational speed and torque. Moreover, although the example of 2 circuits is shown about the contact 11, you may increase together with the cam 10 according to the number of the angles which stop the output shaft 9. FIG.

  Next, control of the geared motor 1 will be described with reference to FIGS.

  As shown in FIG. 3, the external terminal 6 is formed of four terminals, that is, a first external terminal 6a, a second external terminal 6b, a third external terminal 6c, and a fourth external terminal 6d. 11 includes a first contact 11a and a second contact 11b.

  One terminal of the motor 7, one terminal of the first contact 11a, and one terminal of the second contact 11b are connected in common to the first external terminal 6a. That is, the first external terminal 6a is a common external terminal.

  The other terminal of the first contact 11a is connected to the second external terminal 6b, and the other terminal of the second contact 11b is connected to the third external terminal 6c. The other terminal of the motor 7 is connected to the fourth external terminal 6d, and the geared motor 1 is connected to the control device 15 via the first to fourth external terminals (6a to 6d).

  Reference numeral 20 denotes a microcomputer which operates by receiving power supply from a power supply circuit 24 connected to a commercial power supply AC. When driving the geared motor 1, a signal is output to the drive circuit 21, the triac 22 is turned on, and the motor 7 is energized.

  The operation of the first and second contacts (11a, 11b) of the geared motor 1 is appropriately signal-processed by the voltage detection circuit 23 (detection circuit) through the second external terminal 6b and the third external terminal 6c. Thereafter, the signals are input to the input terminals of the microcomputer 20 as Via and Vib. Reference numeral 25 denotes notification means for notifying that an input signal from an operation switch (not shown) has been received, or for displaying the operating state of the device.

  FIG. 4 shows an operation diagram (time chart) of the first contact 11a and the second contact 11b of the geared motor 1, and the first contact 11a is in an OFF state centered on an angle of 0 °, and the second contact The contact 11b is turned off at an angle θ1.

  By the operation of the first and second contacts 11a and 11b, as shown in FIG. 3, the voltages of the common first external terminal 6a, second external terminal 6b, and third external terminal 6c are changed to voltage. The detection circuit 23 (detection circuit) converts the voltage into a DC voltage, and inputs, for example, a voltage of 0 V in the ON state and 5 V in the OFF state to the input terminal of the microcomputer 20 as Via and Vib. Therefore, the microcomputer 20 can know the rotation angle of the output shaft 9 from the input voltage. In order to detect the rotation angle of the output shaft 9 more finely, the number of contacts and cams should be increased. Further, the voltage detection circuit 23 is not limited to the output of 0V and 5V, but may be an input / output characteristic that is consistent with the processing of the microcomputer 20, for example, a circuit that outputs a half-wave signal in the contact ON state and 0V in the OFF state. good.

  Next, control of the output shaft 9 of the geared motor 1 by the control device 15 will be described with reference to FIG.

  FIG. 5 shows an operation flowchart of the control device 15. First, the motor 7 is energized in step (hereinafter referred to as "S") 30, and the voltage Vib input to the input terminal of the microcomputer 20 is determined in S31. If the rotation angle of the output shaft 9 is θ1, Vib is 5 V, for example, and the contact OFF can be known. If Vib is not a contact OFF signal, the process returns to S30 and energization is continued. If Vib is a contact OFF signal, the process proceeds to S32 to turn off the motor 7, and the process proceeds to the dehydration process in S33. In order to return the output shaft 9 of the geared motor 1 to the initial state again after the dehydration process in S33, the motor 7 is energized in S34, and the voltage Via input to the input terminal of the microcomputer 20 is determined in 35.

  If the rotation angle of the output shaft 9 is 360 ° (0 °), it is possible to know that the contact point is OFF when Via is 5 V, for example. If Via is not a contact OFF signal, the flow returns to S34 to continue energization, and if Via is a contact OFF signal initial state, the process proceeds to S36 to turn off the motor 7 and proceed to the next process. As a result, the output shaft 9 of the geared motor 1 stops in the initial state where the rotation angle is 360 ° (0 °).

  As described above, according to the present embodiment, since all the terminals on one side of the contact 11 and the terminals on one side of the motor 7 are commonly connected to the first external terminal 6a, a large number of rotation angles can be obtained. Even if the number of contacts increases in order to detect this, it can be configured without increasing the number of external terminals and connecting wires by bringing together one side terminal of each contact.

  Further, the first external terminal 6a, which is a common external terminal, is connected to the power source, while the voltage detection circuit 23 is connected to the other terminals of the first and second contacts 11a and 11b. Since the power supply to the geared motor 1 is controlled according to the output of the motor, a geared motor control device with good controllability according to the rotation angle of the output shaft 9 can be provided.

  In the present embodiment, an example of two circuits (first contact 11a and second contact 11b) is shown for the contact 11, but it is combined with the cam 10 according to the number of angles at which the output shaft 9 is stopped. By increasing the number, it is possible to realize a plurality of output shaft stop angles by performing the same input / output processing for the increased number of circuits.

(Embodiment 2)
FIG. 6 shows a block diagram of a geared motor control apparatus according to the second embodiment of the present invention. The same parts as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.

  One terminal of the first contact 11a and one terminal of the motor 7 are commonly connected to the first external terminal 6a, and the other terminal of the first contact 11a and one terminal of the second contact 11b. Are connected to the second external terminal 6b, and the other terminal of the second contact 11b is connected to the third external terminal 6c. On the other hand, the resistor 12 that is electrically connected between the second external terminal 6b and the third external terminal 6c is provided on the control device 15 side. The geared motor 1 is connected to the control device 15 via first to fourth external terminals (6a to 6d).

  Reference numeral 20 denotes a microcomputer which operates upon receiving power supply from the power supply circuit 24. When driving the geared motor 1, a signal is output to the drive circuit 21, the triac 22 is turned on, and the motor 7 is energized.

  With the above configuration, the operation of the first and second contacts (11a, 11b) of the geared motor 1 is the resistance between the second external terminal 6b and the second external terminal 6b and the third external terminal 6c. After being rectified and smoothed by the voltage detection circuit 23, the voltage is input as Vi to the A / D conversion input terminal of the microcomputer 20.

  FIG. 7 shows a time chart in which the input state of the control device 15 is made to correspond to the rotation angle of the output shaft 9.

  In the contact operation of the geared motor 1 in FIG. 4, when the resistor 12 is connected as shown in FIG. 6 and the resistance value between the first and third external terminals (6a, 6c) is seen, as shown in FIG. Become. That is, it is Open (open) centered on an angle of 0 °, 33 kΩ (resistance value of the resistor 12) at an angle θ1, and 0 Ω otherwise. This resistance change is converted into a DC potential by the voltage detection circuit 23. For example, a voltage of 0V centered at an angle of 0 °, 1.5V at an angle θ1, and 3.0V at other angles is an A / D conversion input terminal of the microcomputer 20. Is input as Vi. Therefore, the microcomputer 20 can know the rotation angle of the output shaft 9 from the input voltage. If you want to know the rotation angle of the output shaft 9 in more detail, increase the number of contacts and cams, and connect a resistor to the external terminal 6 corresponding to the contact point. It can be detected as a change and can be configured at low cost.

  Next, operation | movement of the control apparatus of the geared motor 1 is demonstrated using FIG.

  In FIG. 8, it is determined that the voltage Vi inputted to the A / D conversion input terminal of the microcomputer 20 is Vi (1.0 to 2.0 V in this case) corresponding to the rotation angle θ1 of the output shaft 9 in S38. After that, the motor 7 is turned off in S39. In S42, after determining that the rotation angle of the output shaft 9 is Vi (in this case, 2.5 V or more) corresponding to the initial state of 360 ° (0 °), the motor 7 is turned off in S43.

  In this way, the output shaft 9 can be controlled. Other configurations are the same as those of the first embodiment, and detailed description thereof is omitted. In the present embodiment, an example of two circuits for the contact 11 is shown. However, since the number of the output shaft 9 is increased with the cam 10 in accordance with the number of angles at which the output shaft 9 is stopped, the same input / output is provided for the increased circuit. By performing the processing, a plurality of output shaft stop angles can be realized.

  As described above, since the geared motor and the control device thereof according to the present invention can stop the output shaft at a plurality of angles with an inexpensive configuration, various devices and apparatuses equipped with a drive mechanism such as a washing machine. And applicable to various automatic devices.

Plan view of geared motor in Embodiment 1 of the present invention Exploded perspective view of the same geared motor Block diagram of the geared motor controller Operation diagram of contacts of the same geared motor Flowchart showing the operation of the geared motor control device Block diagram of a geared motor control apparatus in Embodiment 2 of the present invention The figure which shows the input state of the control apparatus of the same geared motor Flowchart showing the operation of the geared motor control device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Geared motor 2 Output lever 6 External terminal 6a 1st external terminal 6b 2nd external terminal 6c 3rd external terminal 6d 4th external terminal 7 Motor 8a, 8b Reduction gear (deceleration mechanism)
9a Gear part (reduction mechanism)
DESCRIPTION OF SYMBOLS 9 Output shaft 11 Contact 11a 1st contact 11b 2nd contact 13 Reverse rotation prevention mechanism 15 Control apparatus 23 Voltage detection circuit (detection circuit)

Claims (4)

A motor, a speed reduction mechanism that reduces the rotational force of the motor and transmits it to the output shaft, a reverse rotation prevention mechanism that restricts the output shaft to rotate in one direction, a cam that rotates in connection with the output shaft, and the cam A geared motor comprising a plurality of contacts that are opened and closed by the switch, a common external terminal connected in common to all of one side of the terminal of the contact and a terminal of the one side of the motor. A common external terminal of the geared motor according to claim 1 is connected to a power source, and connected to the other terminal of each contact, and has a plurality of detection circuits for detecting the open / closed state of the contact, and the detection circuit A geared motor control device for controlling energization of the geared motor in accordance with the output of the geared motor. A motor, a speed reduction mechanism that reduces the rotational force of the motor and transmits it to the output shaft, a reverse rotation prevention mechanism that restricts the output shaft to rotate in one direction, a cam that rotates in connection with the output shaft, and the cam A first external terminal connected in common to one terminal of the first contact and the one terminal of the motor, and the other of the first contact. And a second external terminal connected in common to one terminal of the second contact and a third external terminal connected to the other terminal of the second contact. 4. A detection circuit for detecting an open / close state of the first and second contacts by electrically connecting a resistor between the second external terminal and the third external terminal of the geared motor according to claim 3. A control device for a geared motor that controls the geared motor in accordance with an output of the detection circuit.

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