JP2014236771A - Washing machine - Google Patents

Abstract

An object of the present invention is to efficiently perform cloth unraveling at a low cost without applying a large load to a motor. SOLUTION: An outer tub 3 elastically suspended in a casing 1 for storing washing water, an inner tub 4 rotatably supported in the outer tub 3, and a pulsator provided at an inner bottom portion of the inner tub 4. 6, a motor 8 that rotationally drives the inner tank 4 and the pulsator 6, a current detection unit that detects a current value flowing through the motor 8, and a motor control unit that controls the operation of the motor 8, In the cloth unraveling process, the pulsator 6 is rotated, and the rotation direction of the pulsator 6 is reversed when the value of the current flowing through the motor 8 exceeds a predetermined value. It is possible to efficiently unravel the cloth at a low cost without installing a heat sink or increasing the size of the heat sink. [Selection] Figure 5

Description

  The present invention relates to a washing machine that performs cloth unraveling.

  2. Description of the Related Art Conventionally, a washing machine that dries clothes with hot air after dehydration has been used in order to perform washing to drying in a general household. (For example, refer to Patent Document 1).

  FIG. 1 is a longitudinal sectional view showing a conventional washing machine having a drying function, and FIG. 2 is a control block circuit diagram of the washing machine.

  In FIG. 1, a housing 1 is provided with an outer tub 3 that is elastically suspended by a plurality of suspensions 2, and an inner tub 4 that accommodates clothing and a dry object is hollow inside the outer tub 3. A pulsator 6 that stirs clothing and a dry object is rotatably disposed on the inner bottom of the inner tub 4 so as to be rotatable around a washing / dehydrating shaft 5 having a double structure. The motor 8 is attached to the outer bottom portion of the outer tub 3 and is connected to the inner tub 4 or the pulsator 6 via the clutch 9 for switching the transmission of rotational force to the washing / dehydrating shaft 5 and the washing / dehydrating shaft 5 during washing or dehydrating. doing.

  The heat exchange duct 12 dehumidifies the circulating hot warm air (circulating air), and is connected to one end of the circulating air receiving chamber 19 located below the drying fan 15. A heater 16 is provided above the drying fan 15 and constitutes a hot air circulation path 17 that circulates from the circulating air receiving chamber 19 to the inner tank 4.

  The outer tub 3 is provided with an outer tub cover 25 that airtightly covers the upper surface of the outer tub 3, and an inner lid 26 is provided on the outer tub cover 25 so as to be freely opened and closed so that clothes can be taken in and out. An upper frame 28 having a garment insertion port 27 is attached to the upper portion of the housing 1 at a substantially central portion, and an outer lid 29 is provided so as to be openable and closable so as to cover the garment insertion port 27.

  The control device 57 is covered and protected by the cover 42. An operation display unit 60 including an input setting unit 43 and a display unit 44 described later with reference to FIG.

  In the control block circuit diagram of FIG. 2, the control device 57 is connected to the motor 8, the clutch 9, the drying fan 15 and the heater 16 constituting the hot air blowing means 21, the drain valve 35, the water supply via the load driving means 61. A control means 62 is provided for controlling the operation of the valve 30 and the like, and controlling the steps of washing, rinsing, dewatering and drying. The control means 62 displays the setting contents on the display means 44 based on the contents set by the user input by the input setting means 43.

  With the configuration as described above, the steps of washing, rinsing, dehydration and drying are executed.

JP 2013-94219 A

  However, in such a conventional washing machine, a pulsator having a rotation axis in the vertical direction is used, and when washing from washing to drying is performed in this manner, the twist of clothes after the dehydration caused by the water flow at the time of washing is reduced. Due to entanglement and entanglement or sticking of clothes inside the inner tub caused by centrifugal force during dehydration, the load on the motor becomes large and the power transmission part must be raised so that it can withstand large torque There is a problem of not becoming.

  In addition, when the motor is driven by inverter control in which the ratio V / F between the applied voltage and frequency of the motor is kept constant, if the slip generated in the motor due to overload increases, the motor rotation speed decreases. At the same time, since the motor current value increases, the heat generation of the electronic components in the control board increases, and there is a problem that it is necessary to install a cooling fan and to increase the size of the heat sink.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a washing machine that can efficiently perform cloth unraveling at a low cost by preventing a large load from being applied to a motor.

  In order to solve the above-described conventional problems, a washing machine of the present invention includes an outer tub that is elastically supported in a housing and stores washing water, an inner tub that is rotatably supported in the outer tub, and A pulsator provided at the inner bottom of the inner tub, a motor for rotationally driving the inner tub and the pulsator, a current detecting means for detecting a current value flowing through the motor, and a motor control means for controlling the operation of the motor. The motor control means rotates the pulsator during a cloth unwinding process, and reverses the direction of rotation of the pulsator when the value of the current flowing through the motor exceeds a predetermined value.

  As a result, the cloth can be unraveled efficiently at low cost without applying a large load to the motor and without installing a cooling fan or increasing the size of the heat sink.

  The washing machine of the present invention can efficiently unravel the cloth at a low cost without applying a large load to the motor.

Side sectional view of an embodiment of the present invention and a conventional washing machine Control block circuit diagram of the washing machine The figure which shows the relationship between the pulsator rotation speed, motor current, and time in embodiment of this invention. Motor control block diagram in the embodiment of the present invention Flow control flowchart of pulsator and motor in the embodiment of the present invention Flowchart at the time of dewatering tank rotation in the embodiment of the present invention The flowchart which changes the motor operation time in embodiment of this invention

  The first invention comprises an outer tub that is elastically suspended in a housing and stores washing water, an inner tub that is rotatably supported in the outer tub, and a pulsator provided on the inner bottom of the inner tub, A motor for rotationally driving the inner tub and the pulsator; a current detection means for detecting a current value flowing through the motor; and a motor control means for controlling the operation of the motor, wherein the motor control means comprises a cloth unwinding step. The pulsator is rotated, and when the value of the current flowing through the motor becomes a predetermined value or more, the rotation direction of the pulsator is reversed. The cloth unraveling can be efficiently performed at low cost without increasing the size of the heat sink.

  In the second invention, in particular, in the cloth unwinding process of the first invention, after the rotation direction of the pulsator is reversed, the inner tub is rotated when the current value flowing through the motor becomes a predetermined value or more. Since the pulsator is rotated again after a predetermined time has elapsed, it facilitates the removal of residual moisture from the washed clothes and reduces the rotational load. It can be carried out.

  The third aspect of the invention compares the current value flowing through the motor during forward rotation and reverse rotation of the pulsator in the cloth unwinding process of the first or second aspect of the invention, and the pulsator rotation with the smaller current value is compared. By extending the operation time in the direction, it becomes possible to loosen the clothes from being entangled and stuck with a small torque.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about this Embodiment, the fundamental structure of a washing machine is the same as that of a prior art example, and the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view showing a washing machine according to an embodiment of the present invention, and FIG. 2 is a control block circuit diagram of the washing machine.

  In FIG. 1, a housing 1 is provided with an outer tub 3 that is elastically suspended by a plurality of suspensions 2 inside, and the suspension 2 absorbs vibration during dehydration. Inside the outer tub 3, an inner tub 4 that accommodates clothes and objects to be dried is rotatably arranged around a washing / dehydrating shaft 5 having a hollow and double structure. And a pulsator 6 for stirring the object to be dried is rotatably arranged.

  The inner peripheral wall of the inner tank 4 is provided with a number of vent holes 4a for draining during dehydration and venting during drying, and a fluid balancer 7 is provided above. The motor 8 is attached to the outer bottom portion of the outer tub 3 and is connected to the inner tub 4 or the pulsator 6 via the clutch 9 for switching the transmission of rotational force to the washing / dehydrating shaft 5 and the washing / dehydrating shaft 5 during washing or dehydrating. doing. The pulsator 6 has a substantially pan-shaped shape having an inclined surface 10 on the outer peripheral portion, and forms a protruding part 11 for stirring. The clothes are stirred during the washing process, and the object to be dried is rotated by the pulsator 6 during the drying process. It is easy to soar upward along the inclined surface by centrifugal force. As a result, the clothes are moved left and right (rotation direction) by agitation and also moved up and down.

  The heat exchange duct 12 dehumidifies the circulating hot air (circulated air), and one end is connected to the drainage passage port 14 provided in the lower part of the outer tub 3 through the connection duct 13, and the other end is On the inlet side of the hot air circulation path 17, it is connected to one end of a circulating air receiving chamber 19 located below the drying fan 15.

  A heater 16 is provided at the upper part of the drying fan 15, and the outlet side of the hot air circulation path 17 is connected to an upper bellows-like hose 18 having a hot air ejection hole 20. A hot air circulation path 17 that is connected to the tank 4 and circulates is constituted, and the above-mentioned components including the hot air circulation path 17 constitute a hot air blowing means 21.

  A temperature detecting means 22 is provided on the inlet side of the hot air circulation path 17 and a temperature detecting means 23 is provided on the outlet side to detect the circulating air temperature during the drying process.

  A filter 24 is provided in the circulating air receiving chamber 19, and the circulating air circulates through the filter 24, and the filter 24 collects lint generated from the clothing.

  The outer tub 3 is provided with an outer tub cover 25 that hermetically covers the upper surface of the outer tub 3, and the outer tub cover 25 is provided with a hot air jet hole 20 from the upper and lower bellows-shaped hose 18 that can be expanded and contracted. Yes. Further, an inner lid 26 is provided on the outer tub cover 25 so as to be freely opened and closed so that clothes can be taken in and out.

  An upper frame 28 having a garment insertion port 27 is attached to the upper portion of the housing 1 at a substantially central portion, and an outer lid 29 is provided so as to be openable and closable so as to cover the garment insertion port 27.

  Further, a support member 31 to which the hot air blowing means 21 and the water supply valve 30 are attached is provided inside the rear portion of the upper frame body 28.

  The water supply valve 30 has a multi-valve configuration in which two or more water channels can be opened and closed. One water channel is connected to a cleaning pipe 38 formed in the drainage duct 36 by a cleaning hose 33, and one water channel is a water supply hose 34. Then, it is connected to the inner tub 4 through a water injection member (not shown) provided on the support member 31 so that it can be supplied as washing water, and one water channel is connected to the heat exchange duct 12 by a water supply hose. .

  A drainage duct 36 and a drainage valve 35 for draining the water in the outer tub 3 are provided at the bottom of the outer tub 3, and are connected to the heat exchange duct 12 and the connection duct 13 through the drainage duct 36. The drainage from the heat exchange duct 12 is guided to the drainage duct 36 and the drainage valve 35 and drained from the drainage hose 37 to the outside of the machine. The drain duct 36 is formed with a cleaning pipe 38 to which one end of a cleaning hose 33 piped to the water supply valve 30 is connected.

  The drainage path 40 includes a cleaning pipe 38, a drainage duct 36, a drainage valve 35, a drainage hose 37, and the water drained from the drainage path 40 is discharged to a drain trap 46.

  Further, a turbidity detecting means 45 comprising an optical sensor that emits and receives infrared rays (infrared rays) or visible rays is attached to the drainage passage 40 upstream of the drainage valve 35. By detecting the turbidity of the washing water, the degree of dirt on the clothes is detected.

  A conductivity detecting means 39 comprising a pair of electrodes for detecting the conductivity of the washing water and detecting the presence or absence of water and the type of detergent is provided inside the outer periphery of the outer tub 3. Since the lower part of the pulsator 6 is below the upper surface of the outer periphery of the pulsator 6, it is difficult to be affected by the water flow caused by the rotation of the pulsator 6, and the conductivity can be detected stably.

  The control device 57 is integrally formed and disposed substantially vertically on the back surface (back cover) 41 of the housing 1. The control device 57 is covered and protected by the cover 42.

  An operation display unit 60 including an input setting unit 43 and a display unit 44 described later with reference to FIG.

  In the control block circuit diagram of FIG. 2, the control device 57 is connected to the motor 8, the clutch 9, the drying fan 15 and the heater 16 constituting the hot air blowing means 21, the drain valve 35, the water supply via the load driving means 61. Control means 62 is provided for controlling the operation of the valve 30 and the like, and controlling the steps of washing, rinsing, dehydration and drying and the sterilization / deodorization process.

  The control means 62 is composed of a microcomputer or the like, and starts operating when power is supplied from the commercial power supply 63 when the power switch 64 is turned on. The outputs of the water level detection means 65 and the temperature detection means 22 and 23 are input and input. Based on the contents set by the user by the setting means 43, the setting contents are displayed on the display means 44, and the motor 8, the clutch is connected via the load driving means 61 constituted by a bidirectional thyristor, a relay and the like. 9. Control the operations of the drying fan 15, heater 16, drain valve 35, water supply valve 30 and the like, and control the steps of washing, rinsing, dehydration and drying. The input setting unit 43 and the display unit 44 constitute an operation display unit 60.

  Further, the control means 62 determines the type of detergent and stains on clothes based on the conductivity of the washing liquid obtained from the conductivity detection means 39, the infrared transmittance obtained from the turbidity detection means 45, and the rate of change thereof. Each stroke is controlled by detecting the degree, the amount of lint from the clothing being dried, and the like.

  Further, the control means 62 turns off the heater 16 when the temperature detected by the temperature detection means 23 reaches a first predetermined temperature (for example, 110 ° C.) in the drying process, and the temperature detection means 22 at that time. When the temperature falls to a second predetermined temperature (for example, 2k), the heater 16 is operated to adjust the temperature of the circulating air.

  In the above configuration, basic operations from washing, rinsing, dehydration to drying steps will be described.

  In the washing process, the outer lid 29 is opened, the inner lid 26 is opened, clothes and detergent are put into the inner tub 4, and when the operation is started, water is supplied into the inner tub 4 up to a predetermined water level with water supply a, and then the motor 8 is driven. At this time, the power of the motor 8 is transmitted to the pulsator 6 through the washing shaft by the clutch 9 of the transmission mechanism, and the pulsator 6 rotates, so that the clothes are caught by the agitation protrusion 11 of the pulsator 6 and the center part. Drawn into. The clothing at the center lower layer portion of the inner tub 4 is pushed up to the upper layer portion of the inner tub 4 by the drawn-in clothing. In this way, the clothes in the inner tub 4 are agitated, and the mechanical force acting by the contact between the clothes or the inner wall of the inner tub 4 or the pulsator 6 and the water flow force are used.

  In the first rinsing process, the drain valve 35 is opened and the water in the inner tub 4 is drained from the drain hose 37, and then the clutch 9 of the transmission mechanism is switched to the dehydrating side to power the motor 8 and the dehydrating shaft. It is performed by separating the moisture from the clothing by transmitting it to the inner tub 4 and rotating it to give centrifugal force to the clothing. Then, after the motor 8 and the clutch 9 are turned off, water is supplied to a predetermined water level with the water supply a, the motor 8 is driven again, and stirring for taking out the detergent liquid from the clothing is started.

  In the second rinsing process, that is, the final rinsing process, draining and dewatering are performed in the same manner as in the first rinsing process, and then the water supply valve 30 is operated after the drain valve 35 is closed to supply water to the water supply hose 34. Is started, water is supplied to the inner tank 4 to a predetermined water level via a water injection member (not shown), and rinsing is started.

  The first rinsing step can be omitted depending on the degree of dirt on the clothes and the amount of clothes.

  In the dehydration process, after rinsing is completed, the drain valve 35 is opened and the water in the inner tank 4 is drained from the drain hose 37, and then the clutch 9 of the transmission mechanism is switched to the dehydration side to The water is separated from the garment by transmitting it to the inner tub 4 and rotating it and applying centrifugal force to the garment, thereby completing the process from washing to dehydration.

  In the drying process, the clutch 9 is switched to the washing side, the motor 8 is driven and transmitted to the pulsator 6, the pulsator 6 is rotated forward and reverse, the clothes are caught by the stirring protrusion 11 and stirred, and the drying fan Warm air is sent to the hot air jet hole 20 by the hot air blowing means 21 including the heater 15 and the heater 16. The warm air blown into the inner tub 4 from the warm air ejection hole 20 evaporates moisture from the clothing, then exits from the inner tub 4 to the inside of the outer tub 3, and further passes through the connection duct 13 from the drainage passage port 14. To the heat exchange duct 12.

  When hot air containing moisture from the clothing deprived of moisture passes through the inner wall of the outer tub 3 or the heat exchange duct 12, the water from the water supply valve 30 installed inside the rear part of the upper frame 28 is outside. The outer wall of the tank 3 or the heat exchange duct 12 is cooled, moisture condensation occurs inside, the moist hot air is dehumidified, enters the circulating air receiving chamber 19, passes through the filter 24, and then the drying fan. Return to 15. By circulating the warm air in this circulation path, the clothes in the inner tub 4 can be dried.

  In the latter half of the drying process, lint is generated from the clothes being dried in the inner tub 4, and the lint is carried along with the circulating air to the drainage duct 36 and the heat exchange duct 12, and from the water supply valve 30 to the heat exchange duct 12 and drainage duct. The water supplied to 36 is led to a drain valve 35 and a drain hose 37 and discharged outside the apparatus. As described above, washing and drying are performed.

  Here, in the above-described drying process, in order to dry the clothes efficiently, the clothes stuck to the inner wall of the inner tub 4 after dehydration are controlled, or the clothes entangled at the upper part of the pulsator 6 are loosened. This control will be described with reference to FIGS.

  3 is a diagram showing the relationship between the pulsator rotation speed, motor current, and time when clothes are entangled, FIG. 4 is a motor control block diagram, and FIG. 5 is a pulsator when a predetermined current or more flows through the motor. FIG. 6 is a flowchart for rotating the dewatering tank, and FIG. 7 is a flowchart for changing the motor operating time.

  As shown in FIG. 3, when the pulsator 6 is rotated, if the garment is entangled or if the garment is caught by a protrusion in the washing tub, the load torque increases, and the load torque itself varies greatly. For this reason, the actual rotational speed is decreased or greatly fluctuated with respect to the target rotational speed of the pulsator. As described above, it is difficult to control the pulsator and the motor at a constant rotation speed. In particular, when a load greater than the motor torque generated from the motor is generated on the pulsator due to clothing entanglement, a large torque is transmitted to the power transmission unit. As a result, the durability of the structural parts such as the transmission mechanism is reduced, or the motor drive circuit continues to pass a large motor current, which increases the heat generation of the drive circuit.

  Thus, the rotation control of the pulsator and the motor when the clothing is entangled or the clothing is caught on the protrusion in the washing tub and the overload of the motor becomes large will be described with reference to FIG.

  As shown in FIG. 4, the motor 8 is controlled by the microcomputer 73 based on the outputs of the current detection circuit 71 and the rotor position detection circuit 72. The current detection circuit 71 is exemplified as current detection means for detecting a current value flowing through the motor 8. Moreover, the microcomputer 73 is illustrated as a motor control means.

  When the dehydration process is completed and the process proceeds to the drying process, as shown in FIG. 5, a flapping rotation process is started by a pulsator that loosens clothes entangled on the pulsator or clothes stuck to the inner surface of the inner tank. The flapping rotation stroke is exemplified as the cloth unwinding stroke.

  When flapping is started (S1), the motor is driven and normal rotation of the motor is started (S2). At this time, it is determined by the current detection circuit 71 whether or not the motor current during forward rotation is equal to or greater than a predetermined value, for example, 5.2 A (S3). If the motor current is less than the predetermined value, the motor is operated for a predetermined time (S4), and reverse rotation of the motor is started (S6). At this time, the current detection circuit 71 determines whether or not the motor current at the time of reverse rotation is equal to or greater than a predetermined value, for example, 5.2 A (S7). If the motor current is less than the predetermined value, the motor is operated for a predetermined time (S8), the process returns to the start of flapping (S1) again, and the forward rotation of the motor is started (S2).

  Thus, in the flapping rotation process by the pulsator, if the motor current is less than a predetermined value, the forward and reverse rotations are performed for a predetermined time, and the clothes are loosened by repeating a series of steps S1 to S8. The number of repetitions of S1 to S8 is set as appropriate.

  In S3, when the motor current during forward rotation is equal to or greater than a predetermined value, the forward rotation abnormal current is measured (S5), and the reverse rotation of the motor is started (S6). Thereby, clothes can be loosened, preventing the overload to a motor.

  If the motor current is equal to or greater than the predetermined value in S7, the reverse rotation abnormal current is measured (S9), and the process shifts from the flapping rotation process by the pulsator to the inner tank rotation process to be described later. In this case, since the clothes are not sufficiently loosened, the clothes are loosened in the next inner tank rotation process. This is because it is difficult to loosen clothes only by rotating the pulsator, so that the clothes are loosened by rotating the inner tank.

  As described above, in the flapping rotation process by the pulsator 6, if the motor current is equal to or greater than a predetermined value, the motor is immediately switched to the reverse rotation at the time of normal rotation, and immediately switched to the normal rotation at the time of reverse rotation to drive the motor. It is intended to loosen clothing while preventing overloading. That is, the pulsator 6 is rotated in the cloth unwinding process after the dehydration process is completed, and the rotation direction of the pulsator 6 is reversed when the current value flowing through the motor 8 exceeds a predetermined value. Thereby, it is possible to forcibly loosen clothes that are entangled or stuck to the inner surface of the inner tank and the upper surface or outer peripheral portion of the pulsator 6 without applying a large load to the motor.

  However, due to an increase in clothing capacity, the sticking to the outer peripheral portion is strong, and the sticking may not be removed. In the flowchart of FIG. 5, when the motor current exceeds a predetermined value and the motor cannot be rotated for a predetermined time and a predetermined number of times, the clothes are loosened by rotating the inner tub 4. The loosening of clothing by the rotation of the inner tub will be described with reference to FIG.

  In FIG. 6, switching is performed so that the rotational force of the motor 8 is transmitted to the inner tub 4 via the clutch 9 and the washing / dehydrating shaft 5, and the rotation of the inner tub 4 is started (S10). The inner tank 4 is operated for a predetermined time (S11), and the process is again shifted to the flapping rotation stroke by the pulsator 6 of FIG. By rotating the inner tub in FIG. 6, it is possible to promote the removal of moisture contained in the washed clothes and reduce the rotational load. In the inner tank rotation process of FIG. 6, drying using the drying fan 15, the heater 16, and the hot air circulation path 17 may be used together, thereby further promoting the removal of moisture contained in the clothing and reducing the rotational load. It becomes possible to reduce.

  Thus, in the flapping rotation process by the pulsator 6 in FIG. 5, after reversing the rotation direction of the pulsator 6, the inner tank of the flowchart in FIG. The rotation is performed for a predetermined time, the load is reduced by removing moisture from the clothing, and the clothing is loosened. Then, returning to the flowchart of FIG. 6 again, the clothing is loosened by the rotation of the pulsator 6 so that a large load is not applied to the motor. While doing so, the clothing can be loosened. It is more effective to repeat the flowcharts of FIGS. 5 and 6 as appropriate.

  In addition, when the flapping rotation process is performed by the pulsator 6 in FIG. 5, if the clothing is stuck, the torque required to peel the clothing depends on the relationship between the position of the stuck clothing and the shape of the pulsator. Depending on the rotation direction of the pulsator, it varies greatly. Therefore, in order to efficiently loosen clothing while reducing the load on the motor, it is effective to implement a control that correlates the rotation direction of the motor and the operation time. This control will be described with reference to FIG. Note that the flowchart of FIG. 7 is appropriately implemented in the flowchart of FIG.

  In FIG. 7, the flapping start (S12) corresponds to the start (S1) of the flapping rotation stroke by the pulsator of FIG. Further, the motor current reading during forward rotation (S13) is performed by the measurement of forward rotation abnormal current (S5) executed when the motor current during forward rotation is greater than or equal to a predetermined value (S3) in FIG. Is. Further, the motor current reading at the time of reverse rotation (S14) is performed by the measurement of the reverse rotation abnormal current (S9) executed when the motor current at the time of reverse rotation in FIG. 5 is a predetermined value or more (S7). .

  In FIG. 7, when flapping by the pulsator is started (S12), motor current reading during forward rotation (S13) and motor current reading during reverse rotation (S14) are performed. If the motor current read in S13 and S14 is greater than or equal to a predetermined value, the motor operating time is changed (S16). Specifically, when the motor current at the time of forward rotation is equal to or greater than a predetermined value, for example, 5.2A or more, and the motor current at the time of reverse rotation is less than a predetermined value, for example, less than 5.2A, the reverse rotation with less motor current. The driving time in the direction is set to operate for a longer time than in the normal rotation direction. Further, when the motor current during the reverse rotation is equal to or greater than a predetermined value and the normal rotation time is less than the predetermined value, the driving time in the normal rotation direction is operated for a longer time than in the reverse rotation direction. When both the forward rotation and reverse rotation current values are greater than or equal to a predetermined value, the drive time in the direction with less motor current is operated for a long time.

  Further, the motor current reading during forward rotation (S13) is performed by measuring the motor current that is executed when determining whether the motor current during forward rotation is greater than or equal to a predetermined value in FIG. The motor current reading at the time (S14) may be performed by measuring the motor current executed when determining whether or not the motor current at the time of reverse rotation in FIG. 5 is equal to or greater than a predetermined value (S7). . In this case, the motor current values at the time of forward rotation and at the time of reverse rotation are compared, and the drive time in the direction with the smaller motor current is operated for a long time.

  In this way, by comparing the motor current value in the forward rotation direction and the reverse rotation direction and increasing the operation time in the pulsator rotation direction with a small motor current, the entanglement and sticking of clothes can be loosened with a small torque, The clothes can be gathered on the pulsator 6 and sufficiently dispersed and stirred. The workability when the clothes are taken out after the dehydration process is improved, and the clothes can be easily taken out from the inner tank 4. In addition, it becomes possible to accurately disperse and agitate the clothes during the drying process following the dehydration process, efficiently drying, shortening the drying time, and eliminating wrinkles and uneven drying. Can improve the finish.

  In this way, clothing can be loosened without applying a large load to the motor, and the motor current value is suppressed to a predetermined value or less without applying a large load to the power transmission unit. Therefore, it is not necessary to install a cooling fan or increase the size of the heat sink, and it is possible to efficiently dry at low cost.

  In addition, it is not always necessary to perform such cloth unwinding alone as a cloth unwinding process, and drying can be efficiently performed by performing it during the drying process. For example, in the drying process, the same motor drive control is performed while sending hot air to the inner tub 4, so that the clothes can be loosened without applying a large load to the motor, and the dry finish has less wrinkles and uneven drying. It becomes possible to be in a state. Moreover, since hot air is efficiently applied to clothes, drying time can be shortened.

  In addition, if the pulsator 6 has a reversal angle of 360 degrees or less at the time of washing and a pulsator 6 has a reversal angle of 360 degrees or less at the time of drying, the entanglement between clothes can be reduced and the clothes can be dispersed. And stirring can be facilitated. For example, by performing the motor drive control as described above during the washing process, the irregular exchange between clothes is reduced during washing to reduce entanglement, and after completion of dehydration, the entanglement between clothes is reduced by centrifugal force. Since it can be made the state affixed on the inner surface of the inner tank 4, flapping at the time of a drying process comes to be performed more effectively, and drying performance improves.

  In addition, the clothing whose inclined surface is pushed up by the centrifugal force in the inclined direction generated by the rotation of the pulsator 6 falls to the bottom surface portion when the rotation of the pulsator 6 is decelerated. Due to the vertical force acting on the garment, the garment is dispersed and agitated from the pressed state, and efficiently releases moisture to the dry hot air fed into the inner tub 4 by the heater and the drying fan. Thus, the drying time of the clothes can be shortened, and wrinkles and drying unevenness can be eliminated to improve the finished state.

  As described above, the washing machine according to the present invention does not place a large load on the motor, and can efficiently unravel the cloth at a low cost. Is also applicable.

DESCRIPTION OF SYMBOLS 1 Case 3 Outer tank 4 Inner tank 6 Pulsator 8 Motor 71 Current detection circuit (current detection means)
73 Microcomputer (Motor control means)

Claims (3)

An outer tub that is elastically supported in a housing and stores washing water, an inner tub that is rotatably supported in the outer tub, a pulsator provided at an inner bottom of the inner tub, the inner tub and the pulsator A motor for rotating the motor, current detection means for detecting a current value flowing through the motor, and motor control means for controlling the operation of the motor. The motor control means rotates the pulsator during a cloth unraveling process. And the washing machine which reversed the rotation direction of the said pulsator when the electric current value which flows into the said motor became more than predetermined value. In the cloth unraveling process, after the rotation direction of the pulsator is reversed, when the current value flowing through the motor exceeds a predetermined value, the inner tub is rotated, and the pulsator is rotated again after a predetermined time has elapsed. The washing machine as set forth in claim 1. In the cloth unraveling process, the current value flowing through the motor during forward rotation and reverse rotation of the pulsator is compared, and the operation time in the pulsator rotation direction with a smaller current value is lengthened. The washing machine as described in.

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