JP4661466B2 - Drum washing machine - Google Patents

Description

  The present invention relates to a drum-type washing machine that rotates and drives a drum containing laundry to perform washing, rinsing, and dehydration processes.

  Conventionally, this type of washing machine is configured to drive a rotating drum that stores laundry and can rotate about a horizontal axis by a motor, and the number of rotations of the motor is controlled by a control unit (for example, Patent Document 1).

  FIG. 6 is an operation time chart of the main part in the dehydration process of the conventional drum type washing machine. In the dehydration process, the control means rotates the first laundry speed at a fourth speed N4 ′ (for example, 100 r / min), which is the speed at which the laundry sticks to the inner wall of the rotary drum, and determines the cloth bias. When an unbalance determination process is performed and it is determined that there is little bias in the laundry, a preliminary dehydration process is performed in which the rotation amount of the rotating drum is increased to the 5 ′ rotation speed N5 ′ (for example, 500 r / min) and the amount of cloth is measured. Next, an inertial rotation process is performed in which the motor is turned off and inertial rotation is performed. When a predetermined time has elapsed, the motor is turned on again, the rotating drum is rotated at the 4'th rotation speed N4 ', the second unbalance determination process for determining the cloth bias is performed, and the dehydration process is performed.

Here, in the inertial rotation stroke, when the rotation speed of the rotary drum is controlled to the fourth rotation speed N4 in order to perform the second unbalance determination process after the motor is turned off, the drum is stabilized without stalling. In order to control the rotation, the motor is turned on at a predetermined conduction angle when the speed falls to a seventh speed N7 (for example, 120 r / min) higher than the fifth speed N5 ′, and the set speed is gradually lowered. Thus, the control is performed so that the fourth rotational speed N4 ′ is obtained.
Japanese Patent Laid-Open No. 9-10890

  However, in the conventional configuration described above, the motor is turned on at a predetermined conduction angle when the seventh rotational speed N7 is reached, and after the set rotational speed is gradually decreased to the fourth rotational speed N4 ′, the motor is turned on. Since the balance determination was performed, there was a problem that it took time (t6 ′ to t6 ″) shown in FIG. 6 until the fourth speed N4 ′ was reached.

The present invention is intended to solve the conventional problems described above, when reducing the rotational speed by the inertial rotation of the motor until the rotational speed of performing unbalance determination step, constant to safely controlled at a predetermined rotational speed, to shorten the time It is an object.

In order to achieve the above object, a drum type washing machine according to the present invention includes a rotating drum that accommodates laundry and is rotationally driven with a horizontal or inclined direction as a rotation axis, a motor that drives the rotating drum, At least one of a power switching means for controlling the rotation of the motor by changing a conduction angle of a voltage applied to the motor, a rotation speed detecting means for detecting the rotation of the rotating drum, and each step of washing, rinsing, and dewatering And a control means for controlling the number of revolutions of the rotating drum by performing the above-described process, and the control means rotates at the first number of revolutions when the laundry sticks to the inner wall of the rotating drum when the laundry is dehydrated. A first unbalance determination step for determining the fabric bias, a preliminary dehydration step in which the motor is turned off and then the motor is turned off, and the rotation speed of the rotary drum is increased to the first rotation number. When the motor is turned on, the motor is turned on and a second unbalance determination process for controlling again to the first rotational speed and a dehydration process for increasing to the third rotational speed are sequentially performed. In the second unbalance determination process, the motor Is turned on again, the motor is turned on based on the average conduction angle of the voltage applied to the motor during a predetermined time during the first unbalance determination process, and the rotation speed of the rotating drum is again set to the first rotation. The number is controlled .

Thus, at the time of dehydration, when lowered to the rotational speed of performing unbalance determination strokes the rotational speed by the inertial rotation of the motor, the constant to safely controlled at a predetermined rotational speed, it is possible to shorten the time.

The drum type washing machine according to the present invention stably controls the drum to a predetermined number of rotations and shortens the time when the number of rotations is reduced to the number of rotations for performing the unbalance determination process by inertial rotation of the motor during dehydration. be able to.

The present invention includes a rotating drum that accommodates laundry and is rotationally driven with a horizontal direction or an inclined direction as a rotation axis, a motor that drives the rotating drum, and a conduction angle of a voltage applied to the motor to change the angle. A power switching means for controlling the rotation of the motor; a rotation speed detection means for detecting the rotation of the rotating drum; and at least one of the steps of washing, rinsing and dewatering, and the rotation speed of the rotating drum And a control means for controlling the cloth, wherein the control means rotates the clothes at a first rotational speed at which the laundry sticks to the inner wall of the rotary drum when the laundry is dehydrated, and determines a cloth imbalance. And a pre-dehydration step in which the motor is turned off and then the motor is turned off, and the motor is turned on and the first rotation again when the rotational speed of the rotary drum is lowered to the first rotational speed. When the second unbalance determination process to be controlled and the dehydration process up to the third rotational speed are sequentially performed and the motor is turned on again in the second unbalance determination process, Based on the average conduction angle of the voltage applied to the motor at a predetermined time, the motor is turned on to control the rotational speed of the rotating drum again to the first rotational speed . when lowering the inertial rotation of the motor until the rotational speed of performing unbalance determination stroke the speed constant to safely controlled at a predetermined rotational speed, it is possible to shorten the time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view showing a configuration of a main part of a drum type washing machine according to Embodiment 1 of the present invention. The drum 1 is provided with a large number of water passage holes 2 on the entire outer periphery thereof and is rotatably disposed in a water receiving tank 3. One end of a rotation shaft 4 in a substantially inclined direction is fixed to the rotation center of the drum 1, and a drum pulley 5 is fixed to the other end of the rotation shaft 4. The motor 6 is connected to the drum pulley 5 by a belt 7 and rotationally drives the drum 1. A lid 8 is provided at the opening of the drum 1 so as to be freely opened and closed. The water receiving tub 3 is supported by a spring body (not shown) from the washing machine body 9 so as to prevent vibration during dehydration from being transmitted to the washing machine body 9, and a weight for reducing vibration during dehydration (see FIG. Not shown). The heater 10 heats the washing water in the water receiving tub 3.

  The control device 11 controls operations of the motor 6, the heater 10, and the like, and sequentially controls a series of processes such as washing, rinsing, and dehydration.

  Operations in the washing process, the rinsing process, and the dehydrating process of each of the above configurations will be described. When the lid 8 is opened, the laundry is put into the drum 1 and the operation is started, the drum 1 is rotated at a low speed by the motor 6 in the washing process, and the laundry in the drum 1 is lifted and dropped onto the water surface. And washed with the impact force when dropped. Next, the same operation as the washing process is performed in the rinsing process. Next, in the dehydration process, the drum 1 is rotated at a high speed, and the laundry is dehydrated by centrifugal force. At this time, if the laundry in the drum 1 is biased, that is, unbalanced, a large vibration is generated in the drum 1 and the water receiving tub 3, but the vibration isolating damper (not shown) attenuates the vibration. It is not transmitted to the washing machine body 9.

  FIG. 2 is a block diagram showing the configuration of the control device 11 according to Embodiment 1 of the present invention.

As shown in FIG. 2, the motor 6 is an induction motor and has two poles. When washing is too easy, the drum 1 is rotated at a first rotation speed N1 (for example, 45 r / min), so that 16 poles are used. That is, when the motor 6 is energized through the path a through the power switching means 12, the drum 1 rotates in the forward direction (clockwise from the front of the washing machine body 9). The rotational speed of the motor 6 is detected by the rotational speed detection means 20, and the control means 24 controls the rotational speed of the motor 6 by changing the conduction angle of the voltage applied to the motor 6 by the power switching means 12. The motor 6 is connected to the drum 1 via a motor pulley 13 and a belt 7 and can rotate the drum 1 at a rotational speed of 45 to 100 r / min. Further, by energizing the motor 6 through the path b through the power switching means 12, the drum 1 is rotated in the reverse direction (counterclockwise from the front of the washing machine body 9) at a rotational speed of 45 to 100 r / min. Can be rotated.

  Next, at the time of dehydration, using 16 poles, the drum 1 is increased to a second rotational speed N2 (for example, 100 r / min), and then the number of poles is switched to 2 poles to change the third rotational speed N3. (For example, 900 r / min). That is, by energizing the motor 6 through the path c through the power switching means 12, the drum 1 is rotated in the reverse direction (counterclockwise from the front of the washing machine body 9). At this time, the rotation speed of the drum 1 can be controlled between 100 and 900 r / min.

  When washing is too easy, since the rotational torque of the motor 6 is required at a low speed (for example, 45 r / min), the number of motor poles is increased so that the torque is generated at a low speed. min)), the number of motor poles can be reduced and the motor can be rotated at a high speed.

  The control means 24 is constituted by a microcomputer or the like, and controls the heater 10, the water supply valve 14, the drain valve 15 and the like via the power switching means 12 constituted by a bidirectional thyristor or the like, and a series of washing, rinsing and dehydration. The process is controlled sequentially. The heater 10 heats the washing water in the water receiving tank 3, the water supply valve 14 supplies water to the water receiving tank 3, and the drain valve 15 drains the washing water in the water receiving tank 3.

  The input setting means 16 inputs a setting course necessary for the user, the start of the operation, and the like, and outputs the input information to the control means 24. The display means 17 displays the setting contents input by the input setting means 16 and the operation state. The water level detecting means 18 detects the water level in the water receiving tank 3, and the water temperature detecting means 18 detects the water temperature in the water receiving tank 3 and outputs the detection result to the control means 24. The rotation speed detection means 20 detects the rotation speed of the motor 6 to detect the rotation speed of the drum 1 and outputs the detection result to the control means 24. The storage means 21 stores data necessary for a series of controls. In addition, 22 is a commercial power source and 23 is a power switch.

  Prior to the dehydration step of driving the drum 1 at the third rotational speed N3 (for example, 900 r / min), the control means 24 is configured to drive the drum 1 at the first rotational speed N1, as shown in FIG. The loosening process, the cloth balancing process in which the rotational speed is gradually increased from the first rotational speed N1 to the fourth rotational speed N4 (for example, 85 r / min), and then the fourth rotational speed N4 is driven for washing. A first unbalance determination process for detecting and determining an object bias (unbalance), a motor pole number switching process for switching the number of poles of the motor 6 from 16 poles to 2 poles, and a dewaterable fifth rotation speed N5 (For example, a preliminary dehydration process driven at 400 r / min), an inertial rotation process to turn off the power to the motor 6, and the motor pole number to 16 poles again to drive at the fourth rotation speed N 4, Detect and judge laundry bias Through the second unbalance determination process, and a motor poles switching stroke for switching to 2 the number of poles of the motor 6 to 16 poles, and to enter the dehydration step.

In the cloth unraveling process, the drum 1 is rotated once to the right and once to the left. The fourth rotational speed N4 is a rotational speed that allows the laundry to stick to the inner wall of the drum 1. The fifth rotational speed N5 that can be dewatered is a rotational speed that is lower than the rotational speed corresponding to the resonance point of the water receiving tub 3. Yes.

  4A and 4B are diagrams showing voltage waveforms applied to the motor according to Embodiment 1 of the present invention, where FIG. 4A shows an AC waveform, and FIG. 4B shows a high level and a low level at the timing when the AC voltage becomes zero. The repeated zero cross signal, (c) is a drive signal, and (d) is a diagram showing the voltage applied to the motor.

  As shown in FIG. 4, the rotational speed of the drum 1 is controlled by phase-controlling the motor 6. With respect to the alternating current waveform (a) as shown in FIG. 3, the power switching means 12 is turned on with a delay of time Ta with reference to the zero cross signal (b) that becomes high level when the alternating voltage becomes zero. Thus, the motor 6 is turned on only for the period of (Tb + Tc). That is, by changing the on-time (Tb + Tc) of the motor 6 with Ta being variable, the number of revolutions is controlled.

  Here, if the power switching means 12 is turned on until the next zero cross signal is input, in order to avoid the problem that when the zero cross signal is shifted, the next half wave is turned on and the phase control cannot be performed. Turns off at time Tc before the zero cross signal. Tc is a fixed time determined for each power supply frequency.

  In the unbalance determination process, first, the number of revolutions of the motor 6 is detected by the number of revolutions detection means 20, and when the number of revolutions detection output is high, the on-time (Tb + Tc) period of the motor 6 in FIG. And reduce the rotation speed. On the other hand, when the output of the rotation speed detection means 20 is low, the motor 6 is rotated to the second rotation by increasing the rotation speed by increasing the ON time (Tb + Tc) of the motor 6 in FIG. Control to number N2. After a predetermined time (for example, about 5 seconds), the conduction angle of the power switching means 12 is fixed and the motor 6 is driven. The state of the laundry in the drum 1 is determined based on the rotational speed fluctuation range of the motor 6 when driven by this fixed conduction angle, and when the rotational speed fluctuation width is large (for example, 3 r / min or more), It is determined that the laundry is in an unbalanced state.

  Next, operations from the washing process or the rinsing process to the start of the dehydration process will be described with reference to FIGS.

  FIG. 5 is a main part operation flowchart according to the first embodiment of the present invention.

  In step 30, the cloth unwinding process is started. When the washing process or the rinsing process is completed and the cloth unraveling process is started, a timer built in the control means 24 is started in step 31 and, in step 32, the 16 pole side of the motor 6 is used to rotate in the forward direction. At this time, the rotation speed of the drum 1 is set to the first rotation speed N1 (for example, 45 r / min), the rotation speed of the motor 6 is detected by the rotation speed detection means 20, and the rotation speed is determined based on this detection output. The motor 6 is feedback-controlled so that the number becomes N1. In step 33, the motor is turned off once, and the rotation is stopped. In step 34, the motor is rotated in the reverse direction. Similarly to the above, the rotation number of the drum 1 is set to the first rotation number N1, and the rotation number detecting means 20 The number of rotations of the motor 6 is detected, and the motor 6 is feedback controlled so as to be N1 based on the detection output.

  Next, when the time t1 elapses in step 35, the cloth balancing process is started. In step 36, the rotational speed of the drum 1 is increased at a first increase rate (for example, an increase of 5 r / min per second). When the time t2 elapses in step 37, the rotation speed of the drum 1 at this time is the fourth rotation speed N4 (for example, 85 r / min) that is the rotation speed at which the laundry in the drum 1 sticks to the inner wall of the drum 1. Has reached.

  Next, a first unbalance determination process is performed. In step 38, the control means 24 detects the conduction angle of the power switching means 12 when the rotation speed of the drum 1 is controlled to the fourth rotation speed N4, and rotates the motor 6 at this conduction angle. In step 39, the rotational speed fluctuation range at this time is detected by the rotational speed detecting means 20.

  The rotational speed fluctuation range detected in step 40 is compared with a predetermined value (for example, 3r / min). If the rotational speed fluctuation range is equal to or larger than the predetermined value, it is determined that vibration and noise increase when entering the preliminary dehydration process. In step 41, the timer is reset, and the process returns to step 31.

  When the rotational speed fluctuation range detected in step 40 is less than or equal to a predetermined value, a motor pole number switching process is performed. It is determined that vibration and noise do not increase even after entering the dehydration process, and after the time t3 has elapsed in step 42, the rotation speed of the drum 1 is increased to a second increase speed (for example, 5 r / min per second in step 43). ) And the number of rotations of the drum 1 reaches the second number of rotations N2, the number of poles of the motor 6 is switched from 16 to 2 in step 44. After the time t4 has elapsed in step 45, the preliminary dehydration process is started, and in step 46, the number of revolutions of the drum 1 is increased at a third increasing speed (for example, increasing by 30 r / min per second) higher than the first increasing speed. Let At this time, the laundry in the drum 1 is dehydrated and can be attached to the inner wall of the drum 1. When the rotational speed of the drum 1 reaches the fifth rotational speed N5 (for example, 400 r / min) at step 47, the motor 6 is turned off at step 48 and the inertial rotation stroke is started.

  When the rotational speed of the drum 1 is reduced to the fourth rotational speed N4 in step 49, the fixed conduction angle of the voltage applied to the motor 6 in the first unbalance determination process from step 38 to step 40, that is, the first A voltage is applied at an average conduction angle in a predetermined time in the unbalance determination process, and control is performed in step 50 so that the rotation speed of the drum 1 becomes the fourth rotation speed N4. Since this average conduction angle is a conduction angle when feedback control is performed to the fourth rotation speed N4, when the control is performed again at the fourth rotation speed N4, the average conduction angle can be stabilized in a short time without stalling. It is. Next, the second balance process is started.

  In step 51, the conduction angle of the power switching means 12 when the rotation speed of the drum 1 is controlled to the fourth rotation speed N4 is detected, and the motor 6 is driven with the detected conduction angle fixed. In step 52, the rotational speed fluctuation range at this time is detected by the rotational speed detection means 20.

  The rotational speed fluctuation range detected in step 53 is compared with a predetermined value (for example, 3r / min). If the rotational speed fluctuation width is equal to or greater than the predetermined value, it is determined that vibration and noise increase when the dehydration process starts. In step 54, the timer is reset, and the process returns to step 31.

  When the rotational speed fluctuation range detected in step 53 is equal to or smaller than the predetermined value, it is determined that vibration and noise do not increase even when the dehydration process is started. After time t7 has elapsed in step 55, the drum 1 is detected in step 56. The rotational speed is increased at a second increase rate (for example, an increase of 5 r / min per second). In this motor pole number switching step, when the rotation speed of the drum 1 reaches the second rotation speed N2, the number of poles of the motor 6 is switched from 16 to 2 in step 57.

  After the time t8 has elapsed in step 58, in step 59, the set rotational speed is changed from the second rotational speed N2, the fifth rotational speed N5, the sixth rotational speed N6 (for example, 420 r / min), and the third rotational speed. The number is gradually increased to a number N3 (for example, 900 r / min), and the process proceeds to the dehydration step in Step 60.

As described above, in the present embodiment, when the inertial rotation stroke in which the motor 6 is turned off is shifted to the second unbalance stroke, the average conduction of the voltage applied to the motor 6 in the first unbalance determination stroke. By applying a voltage to the motor 6 using the corners and performing control so that the rotation speed of the drum 1 becomes the fourth rotation speed N4, the fourth rotation speed N4 can be stably controlled, and the time It can be shortened.

  In the present embodiment, the motor 6 is an induction motor, but may be a commutator motor or the like.

  As described above, the drum-type washing machine according to the present invention stably controls when the rotational speed is controlled again from the state where the motor is off at the predetermined rotational speed that has been subjected to the rotational speed control once. In addition, since the time can be shortened, it is useful as a drum-type washing machine that performs each process of washing, rinsing, and dewatering.

Sectional drawing which shows the principal part structure of the drum type washing machine which concerns on Embodiment 1 of this invention. Block diagram of the drum type washing machine Timing chart of the drum type washing machine Main part operation time chart of the drum type washing machine Main part operation flowchart of the drum type washing machine Main part operation time chart of conventional drum-type washing machine

1 Drum 6 Motor 20 Rotational Speed Detection Unit 24 Control Unit

Claims (1)

A rotating drum that accommodates the laundry and is driven to rotate about a horizontal or inclined direction as a rotation axis, a motor that drives the rotating drum, and a rotation angle of a voltage applied to the motor is changed to rotate the motor. A power switching means for controlling, a rotation speed detection means for detecting the rotation of the rotating drum, and a control for controlling the rotation speed of the rotating drum by executing at least one of washing, rinsing and dewatering strokes. A first unbalance determination step of determining a fabric bias by rotating the laundry at a first rotational speed at which the laundry sticks to the inner wall of the rotating drum when the laundry is dehydrated; and And a pre-dehydration step in which the motor is turned off and then the motor is turned on when the rotational speed of the rotating drum falls to the first rotational speed and is controlled again to the first rotational speed. When a second unbalance determination step and a dehydration step up to the third rotational speed are sequentially performed and the motor is turned on again in the second unbalance determination step, a predetermined time during the first unbalance determination step A drum type washing machine in which the motor is turned on based on an average conduction angle of a voltage applied to the motor to control the rotational speed of the rotating drum to the first rotational speed again .