JP2014161141A - Controller for rotary drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller for a rotary drum, which is able to stop the rotary drum when the door of the rotary drum is opened even if a switching element ON-malfunctions, without using a large door switch that is large in the current capacity of a contact.SOLUTION: When the closed state of a door 42 is detected by a door switch 43 and when a driving start operation is performed through an operation panel 44, a motor control circuit 11 ON-controls either normal rotation triac 12 or reverse rotation triac 13, and drives a rotary drum 41 by a motor 30. When the opened state of the door 42 is detected by the door switch 43, the motor control circuit 11 ON-controls both the normal rotation triac 12 and reverse rotation triac 13, thereby stopping the drive of the rotary drum 41 by the motor 30.

Description

  The present invention relates to a control device that controls the operation of a rotating drum provided in a clothes dryer or the like.

  2. Description of the Related Art Conventionally, a rotary drum with a door that is provided in a clothes dryer or the like and accommodates an object to be stored has a door switch that detects the open / closed state of the door (a switch that turns on / off according to the opening / closing of the door). Is attached. The motor that drives the rotary drum is connected to a power source via a switching element.

  The control device that controls the operation of the rotating drum switches between the operation and stop of the rotating drum by turning on / off (conducting / cutting off) the switching element, and the rotating drum is opened by the door switch while the rotating drum is operating Is detected, the switching element is turned off to stop the rotating drum.

  However, when an ON failure of the switching element (a failure in which the switching element is maintained in the conductive state and cannot be switched to the cutoff state) occurs, the switching element cannot be turned off to stop the rotating drum.

  Therefore, the motor and the power source for driving the rotating drum are connected via the contact of the door switch, and the control device is connected via the level conversion unit that converts the current level between the contacts when the contact of the door switch is turned on. A configuration has been proposed in which the input is input to (see, for example, Patent Document 1).

  According to the configuration described in Patent Literature 1, when the door of the rotating drum is opened, the contact of the door switch is turned off and the power supply from the power source to the motor is stopped, so the switching element is turned on. Even so, the operation of the rotating drum can be stopped.

Japanese Patent Publication No.6-28001

  In the configuration described in Patent Document 1, since power is supplied from the power source to the motor through the contact of the door switch, a large door switch having a large current capacity of the contact must be used. There is an inconvenience that the installation space becomes large.

  The present invention has been made in view of the above background, and when the door of the rotating drum is opened even when the switching element is in an ON failure without using a large door switch having a large contact current capacity. Another object of the present invention is to provide a control device for a rotating drum capable of stopping the rotating drum.

  The present invention has been made to achieve the above object, and relates to a rotating drum control device that controls the operation of a rotating drum with a door, which is driven by a motor capable of switching between forward rotation and reverse rotation.

And the control apparatus of the rotating drum of this invention is
One output portion of the single-phase AC power supply is connected to the common terminal of the motor, and the other output portion of the single-phase AC power supply is connected to the forward rotation terminal of the motor via the forward rotation switching element, and the reverse rotation A motor connection circuit connected to a reverse terminal of the motor via a switching element for
A door opening / closing detection unit for detecting an opening / closing state of the door;
When the door opening / closing detection unit detects that the door is closed and a predetermined operating condition is satisfied, either the forward switching element or the reverse switching element is brought into a conductive state. Controlling, driving the rotating drum by the motor,
When the door is opened by the door opening / closing detector while the rotary drum is driven by the motor, the forward switching element and the reverse switching element are both controlled to be in a conductive state. And a motor control circuit for stopping driving of the rotary drum by the motor.

  According to the present invention, the rotating drum is driven by the motor, and the motor control circuit controls one of the forward switching element and the reverse switching element to be in a conductive state, thereby Switch the direction of rotation. And the function which switches the rotation direction of a rotating drum in this way is generally provided in order to prevent the clothing accommodated in the rotating drum in the clothes dryer, for example.

  Here, in the motor, the rotation direction can be switched by switching the connection destination of one output part of the single-phase AC power source between the forward rotation terminal and the reverse rotation terminal. Then, when one output portion of the single-phase AC power supply is connected to both the forward rotation terminal and the reverse rotation terminal of the motor, the rotation of the motor stops.

  Therefore, when the motor control circuit detects that the door is opened by the door opening / closing detection unit while the rotary drum is driven by the motor, the forward switching element and the reverse switching element are detected. Are controlled to be in a conductive state. Thus, even when the forward switching element or the reverse switching element is in an ON failure state, the operation of the motor can be stopped and the rotation of the rotating drum can be stopped.

  In this case, the door open / close detection unit may be anything that can detect the open / closed state of the door, and the function of directly cutting off the energization between the single-phase AC power source and the motor when the door is opened. There is no need to have. Therefore, it is not necessary to use a large door switch having a large contact current capacity.

  The motor is preferably a single-phase capacitor motor.

  When a single-phase capacitor motor is used as the motor, change the stator winding to advance the phase by the capacitor by switching the connection destination of one output part of the single-phase AC power supply to the forward rotation terminal and the reverse rotation terminal By doing so, the rotation direction can be switched. Then, the motor control circuit connects one output portion of the single-phase AC power source to both the forward rotation terminal and the reverse rotation terminal of the single-phase capacitor motor, thereby fixing the single-phase capacitor motor orthogonally. The rotation of the single-phase capacitor motor can be stopped by stopping the generation of the rotating magnetic field by the child winding.

In addition, a rotation detection unit that detects the presence or absence of rotation of the rotating drum,
When the motor control circuit detects that the door is opened by the door opening / closing detection unit while the rotary drum is driven by the motor, first, the forward switching element and the reverse switching element Both of the forward rotation switching element and the reverse rotation switching element are controlled to be in a conductive state when the rotation detecting unit does not detect that the rotating drum has stopped. Thus, it is preferable to stop the driving of the rotary drum by the motor.

  According to this configuration, when the ON switching failure of the forward rotation switching element and the reverse rotation switching element does not occur, both the forward rotation switching element and the reverse rotation switching element are controlled to be in a cut-off state by the motor control circuit. Thus, the motor can be stopped. Therefore, it is possible to prevent an overcurrent from flowing through the motor by bringing both the forward rotation switching element and the reverse rotation switching element into a conductive state.

  In the present invention, it is preferable that the door opening / closing detection unit and the motor control circuit are operated by power supplied from a power source having a voltage lower than an output voltage of the single-phase AC power source.

  According to this configuration, it is possible to reduce power consumption during operation of the door opening / closing detection unit and the motor control circuit.

  In the present invention, the forward switching element and the reverse switching element are both in a conductive state, and an overcurrent flows between the forward terminal, the reverse terminal, and the common terminal of the motor. In some cases, it is preferable that the forward rotation terminal and the reverse rotation terminal of the motor include an energization interruption circuit that interrupts an energization path between the common terminal and the common terminal.

  According to this configuration, when the motor control circuit controls both the forward switching element and the reverse switching element to be in a conductive state, when an overcurrent flows through the motor, The power supply to the motor can be cut off. And thereby, while protecting the said motor, the state which the rotational drive of the said rotating drum was stopped can be maintained.

The block diagram of the control apparatus of a rotating drum. The operation | movement flowchart of a motor control circuit.

  An example of an embodiment of the present invention will be described with reference to FIGS. Referring to FIG. 1, a rotary drum control device 1 (hereinafter referred to as “control device 1”) according to the present embodiment controls the operation of a rotary drum 41 (for example, used in a clothes dryer to store clothes). Is.

  The rotary drum 41 has a cylindrical shape and is rotatably disposed in the drum casing 40, and a door 42 is attached to the front surface of the drum casing 40. In the vicinity of the rotating drum 41, a door switch 43 (corresponding to the door opening / closing detecting unit of the present invention) that switches ON (conductive) / OFF (blocking) of the contact according to the open / closed state of the door 42, An operation panel 44 is provided for instructing operation and stoppage. In addition, you may use a magnetic sensor, a photo sensor, etc. as a door opening / closing detection part.

  The user opens the door 42 to put the contents in the rotating drum 41, closes the door 42, and then operates the switch on the operation panel 44 to operate the rotating drum 41. The rotating drum 41 is driven by a single-phase capacitor motor 30 (hereinafter referred to as the motor 30, which corresponds to the motor of the present invention) capable of switching between forward rotation and reverse rotation.

  The motor 30 has an outer (main) coil 31 and an inner (auxiliary) coil 32 arranged orthogonally, and is applied to the outer coil 31 and the inner coil 32 between the forward rotation terminal 35b and the reverse rotation terminal 35c. A capacitor 33 for generating a phase difference of AC power is connected. In addition, a thermal protector 34 (corresponding to the energization cutoff circuit of the present invention) is provided between the common terminal 35a and the outer coil 31 and the inner coil 32 when it becomes a high temperature due to overcurrent and protects the motor 30. ) Is provided.

  The motor 30 rotates forward (turns clockwise when viewed from the shaft side) when an AC voltage is applied between the common terminal 35a and the forward rotation terminal 35b, and an AC voltage is applied between the common terminal 35a and the reverse rotation terminal 35c. Reverses (turns left when viewed from the shaft side). The motor 30 is provided with a rotation speed sensor 36 (an encoder, a resolver, etc.) that detects the rotation speed of the motor 30.

  The control device 1 includes a control board 10, a door switch 43, and a rotation speed sensor 36 (corresponding to the rotation detection unit of the present invention). The power supply connection terminal 16 a of the control board 10 is connected to the output portion 21 a on the N (neutral) side of the single-phase AC power supply 20 (for example, AC100V single-phase AC power supply), and the power supply connection terminal 16 b is L of the single-phase AC power supply 20. It is connected to the output unit 21b on the (live) side.

  The motor connection terminal 17a of the control board 10 is connected to the common terminal 35a of the motor 30, the motor connection terminal 17b is connected to the forward rotation terminal 35b of the motor 30, and the motor connection terminal 17c is connected to the reverse rotation terminal 35c of the motor 30. ing.

  A rotation speed sensor 36 is connected to the sensor connection terminal 17d of the control board 10, and a door switch 43 is connected to the sensor connection terminal 18b. An operation panel 44 is connected to the operation panel connection terminal 18 a of the control board 10.

  The control board 10 includes a DC power supply 14 that generates DC power (for example, DC power having a voltage of 5 V) from AC power supplied from the single-phase AC power supply 20, and a motor control circuit that operates with the power supplied from the DC power supply 14. 11 and a forward triac 12 that is provided in the middle of a connection circuit between the power supply connection terminal 16b and the motor connection terminal 17b and switches between conduction and interruption between the power supply connection terminal 16b and the motor connection terminal 17b (the forward rotation switching according to the present invention). A reverse triac 13 (corresponding to an element) and provided in the middle of a connection circuit between the power connection terminal 16b and the motor connection terminal 17c to switch between conduction and interruption between the power connection terminal 16b and the motor connection terminal 17c (present invention) Corresponding to the reverse switching element).

  The motor connection circuit 15 is composed of the power connection terminal 16a and the motor connection terminal 17a, the power connection terminal 16b and the motor connection terminal 17b, and the circuit connecting the power connection terminal 16b and the motor connection terminal 17c.

  The motor control circuit 11 includes a CPU, a memory, an interface circuit, and the like (not shown), and controls the operation of the rotating drum 41 by executing a control program for the rotating drum 41 held in the memory by the CPU. The motor control circuit 11 receives a speed detection signal from the rotation speed sensor 36, an open / close detection signal from the door switch 43, and a switch operation signal from the operation panel 44.

  In this case, the door switch 43 only needs to input an opening / closing signal of the door 42 to the motor control circuit 11, and it is not necessary to cut off the power supply to the motor 30. Therefore, a small-sized door switch 43 having a small contact current capacity can be used.

  In addition, the control signal output from the motor control circuit 11 switches the forward triac 12 and the reverse triac 13 between ON (conductive) and OFF (shut off), and the drive of the rotary drum 41 by the motor 30 is controlled. The

  Hereinafter, the control process of the rotating drum 41 by the motor control circuit 11 will be described according to the flowchart shown in FIG.

  In STEP 1, the motor control circuit 11 determines whether or not the door 42 is closed from the door opening / closing detection signal input from the door switch 43. When the door 42 is closed, the process proceeds to STEP2. When the door 42 is open, the process of STEP1 is repeated.

  In STEP 2, the motor control circuit 11 determines whether or not the operation switch provided on the operation panel 44 has been turned ON (whether or not the user has instructed to start operation) from the switch operation signal input from the operation panel 44. to decide. When the operation switch is turned on, the process proceeds to STEP3, and when the operation switch is not turned on, the process returns to STEP1.

  In addition, ON operation of the operation switch provided in the operation panel 44 is equivalent to establishment of the predetermined operating condition of this invention.

  In the next loop of STEP3 to STEP5, the motor control circuit 11 recognizes that the door 42 has been opened by the door open / close detection signal input from the door switch 43 in STEP4, or inputs from the operation panel 44 in STEP5. The rotary drum 41 is driven in STEP 3 until it is recognized from the switch operation signal that the operation switch is turned off (operation stop is instructed by the user).

  The motor control circuit 11 switches the forward / reverse rotation of the motor 30 and reverses the rotation direction of the rotary drum 41 every time a predetermined time elapses. The motor control circuit 11 controls the forward triac 12 to be turned on (conductive state) (the input to the control input terminal of the forward triac 12 is set to 5 V level), and the reverse triac 13 is turned off (shut off state). By performing control (input to the control input terminal of the reverse triac 13 is set to the GND level) and rotating the motor 30 in the forward direction, the rotating drum 41 is driven in the forward direction.

  Further, the motor control circuit 11 drives the rotating drum 41 in the reverse direction by turning on the reverse triac 13 and turning off the forward triac 12 to reverse the motor 30.

  The motor control circuit 11 recognizes that the door 42 has been opened based on the door opening / closing detection signal input from the door switch 43 in STEP 4, or the operation switch is detected from the switch operation signal input from the operation panel 44 in STEP 5. When it is recognized that it has been turned OFF, the process proceeds to STEP 6 and the forward rotation triac 12 and the reverse rotation triac 13 are controlled to be OFF.

  In the next STEP 7, the motor control circuit 11 determines whether or not the rotation of the motor 30 has stopped based on the speed detection signal input from the rotation speed sensor 36. Here, if there is no ON failure of the forward rotation triac 12 and the reverse rotation triac 13 (failure maintained in a conductive state regardless of the input to the control terminal), the forward rotation triac 12 and the reverse rotation triac are determined in STEP 6. By turning off both of the motors 13, energization of the motor 30 can be stopped and the rotation of the motor 30 can be stopped.

  However, if an ON failure has occurred in one of the forward rotation triac 12 and the reverse rotation triac 13, even if the forward rotation triac 12 and the reverse rotation triac 13 are controlled to be OFF in STEP 6, the energization to the motor 30 is not stopped. The motor 30 continues to rotate.

  Therefore, when the motor control circuit 11 determines in STEP 7 that the rotation of the motor 30 has not stopped, it branches to STEP 20 and controls both the forward rotation triac 12 and the reverse rotation triac 13 to be ON. By this control, when both the forward rotation triac 12 and the reverse rotation triac 13 are in the ON state (conduction state), an in-phase AC voltage is applied to both the outer coil 31 and the inner coil 32 without passing through the capacitor 33. The rotating magnetic field is no longer generated and the rotation of the motor 30 is stopped.

  Therefore, driving of the rotating drum 41 by the motor 30 can be stopped and the rotating drum 41 can be stopped. Then, the process proceeds to STEP 8 and the motor control circuit 11 ends the process. On the other hand, when it is determined in STEP 7 that the rotation of the motor 30 has stopped, the motor control circuit 11 proceeds to STEP 8 without performing the process of STEP 20, and ends the process.

  Here, an overcurrent may flow in the motor 30 by controlling both the forward triac 12 and the reverse triac 13 in STEP 20, but the thermal protector 34 that has become hot due to this overcurrent is in a shut-off state. Become. As a result, the energization path of the motor 30 is interrupted to protect the motor 30, and the motor 30 is maintained in a stopped state. In addition, as a thermal protector, the thing of specifications, such as a fusing type, a self-recovery type, a manual return type, can be used.

  Even if the thermal protector 34 is not provided, the effects of the present invention can be obtained.

  In this embodiment, the triac is used as the forward switching element and the reverse switching element of the present invention, but other types of switching elements such as a relay may be used.

  In the present embodiment, an example in which the single-phase capacitor motor 30 is used as the motor of the present invention has been shown. However, the common-phase motor, the forward rotation terminal, and the reverse rotation terminal are provided, and one output unit of the single-phase AC power supply is provided. If the common terminal is connected to the other and the forward rotation terminal and the reverse rotation terminal are both connected to the other output part of the single-phase AC power supply, the motor can be used as the motor of the present invention if the rotation is stopped. Can do.

  DESCRIPTION OF SYMBOLS 1 ... Control apparatus of rotary drum, 10 ... Control board, 11 ... Motor control circuit, 12 ... Forward rotation triac, 13 ... Reverse rotation triac, 14 ... DC power supply, 15 ... Motor connection circuit, 20 ... Single phase AC power supply, 30 A single-phase capacitor motor, 36 a rotational speed sensor, 41 a rotating drum, 42 a door, 43 a door switch, 44 an operation panel.

Claims (5)

A rotating drum control device for controlling the operation of a rotating drum with a door, driven by a motor capable of switching between normal rotation and reverse rotation,
One output portion of the single-phase AC power supply is connected to the common terminal of the motor, and the other output portion of the single-phase AC power supply is connected to the forward rotation terminal of the motor via the forward rotation switching element, and the reverse rotation A motor connection circuit connected to a reverse terminal of the motor via a switching element for
A door opening / closing detection unit for detecting an opening / closing state of the door;
When the door opening / closing detection unit detects that the door is closed and a predetermined operating condition is satisfied, either the forward switching element or the reverse switching element is brought into a conductive state. Controlling, driving the rotating drum by the motor,
When the door is opened by the door opening / closing detector while the rotary drum is driven by the motor, the forward switching element and the reverse switching element are both controlled to be in a conductive state. And a motor control circuit for stopping the driving of the rotary drum by the motor. In the control apparatus of the rotating drum of Claim 1,
The motor is a single-phase capacitor motor, and the rotating drum control device. In the control apparatus of the rotating drum of Claim 1 or Claim 2,
A rotation detecting unit for detecting the presence or absence of rotation of the rotating drum;
When the motor control circuit detects that the door is opened by the door opening / closing detection unit while the rotary drum is driven by the motor, first, the forward switching element and the reverse switching element Both of the forward rotation switching element and the reverse rotation switching element are controlled to be in a conductive state when the rotation detecting unit does not detect that the rotating drum has stopped. The rotary drum control device stops driving of the rotary drum by the motor. In the control apparatus of the rotating drum of any one of Claims 1-3,
The door opening / closing detection unit and the motor control circuit are operated by electric power supplied from a power source having a voltage lower than an output voltage of the single-phase AC power source. In the control apparatus of the rotating drum of any one of Claims 1-4,
When the forward switching element and the reverse switching element are both in a conductive state, and an overcurrent flows between the forward terminal, the reverse terminal and the common terminal of the motor, An apparatus for controlling a rotating drum, comprising: a forward current cut-off circuit that cuts off a current-carrying path between the forward rotation terminal and the reverse rotation terminal and the common terminal.

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