KR-102964474-B1 - Laundry treatment machine

KR102964474B1KR 102964474 B1KR102964474 B1KR 102964474B1KR-102964474-B1

Abstract

The present invention relates to a laundry processing device. A laundry processing device according to an embodiment of the present invention comprises a casing, a washing tub disposed within the casing and having a plurality of lifts formed on its inner surface, a door attached to the casing that opens and closes, a motor that rotates the washing tub, and a control unit that controls the motor. The control unit controls the motor to drive according to a first speed pattern in which, during a load calculation period for calculating the load within the washing tub, the motor accelerates from a first speed that is not zero to a second speed and decelerates from the second speed to a first speed. Accordingly, the load can be accurately calculated even when the load fluctuates.

Inventors

최세화
전차승
권선구

Assignees

엘지전자 주식회사

Dates

Publication Date: 20260512
Application Date: 20200429

Claims (20)

Casing; A washing tub disposed within the above casing and having a plurality of lifts formed on its inner surface; A door attached to the above casing and opened/closed; A motor that rotates the washing tub; A control unit for controlling the above motor; including The above control unit is, During the load calculation period for the load calculation in the washing tub, the motor is controlled to drive according to a first speed pattern that accelerates from a non-zero first speed to a second speed and decelerates from the second speed to the first speed. The above control unit is, When the load increases in the load pattern of the washing tub above, control is made to accelerate from the first speed to the second speed, and A laundry processing device characterized by controlling the speed to decrease from the second speed to the first speed when the load is reduced in the load pattern of the washing tub.
In paragraph 1, The above control unit is, A laundry processing device characterized by controlling the motor so that, during the above-mentioned load calculation period, the motor does not stop and performs acceleration from the first speed to the second speed and deceleration from the second speed to the first speed.
In paragraph 1, The above control unit is, A laundry processing device characterized by calculating the inertia of the washing tub or the amount of material inside the washing tub based on the motor torque and the amount of speed change during acceleration to the second speed and deceleration to the first speed.
In paragraph 1, The above control unit is, A laundry processing device characterized by calculating the inertia of the washing tub or the amount of material in the washing tub based on the motor torque and the amount of speed change during acceleration to the second speed and deceleration to the first speed during the period of the load pattern of the washing tub or during the period of mechanical angle rotation of the motor.
Casing; A washing tub disposed within the above casing and having a plurality of lifts formed on its inner surface; A door attached to the above casing and opened/closed; A motor that rotates the washing tub; A control unit for controlling the above motor; including The above control unit is, During the load calculation period for the load calculation in the washing tub, the motor is controlled to drive according to a first speed pattern that accelerates from a non-zero first speed to a second speed and decelerates from the second speed to the first speed. The above control unit is, A laundry processing device characterized by controlling the load pattern of the washing tub and the first speed pattern to be synchronized.
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Casing; A washing tub disposed within the above casing and having a plurality of lifts formed on its inner surface; A door attached to the above casing and opened/closed; A motor that rotates the washing tub; A control unit for controlling the above motor; including The above control unit is, During the load calculation period for the load calculation in the washing tub, the motor is controlled to drive according to a first speed pattern that accelerates from a non-zero first speed to a second speed and decelerates from the second speed to the first speed. The above first speed and the above second speed are, A laundry processing device characterized by being smaller than the third speed, which is the speed at which a laundry cloth in the washing tub attaches.
In paragraph 1, The above control unit is, A laundry processing device characterized by controlling the number of repetitions of the first speed pattern to vary according to the load pattern of the washing tub.
In paragraph 1, The above control unit is, In the case where the load level in the load pattern of the washing tub above increases from a first level to a second level, which is the maximum level, decreases from the second level to a third level, which is the minimum level, and then increases from the third level to the first level, A laundry processing device characterized by controlling the motor to accelerate from a first speed to a second speed at the time when the load level increases from the first level to the second level.
In paragraph 1, The above control unit is, A laundry processing device characterized by controlling the speed pattern to start in response to the start time of the load pattern of the washing tub, and controlling the speed pattern to end in response to the end time of the load pattern of the washing tub.
In paragraph 1, The above control unit is, During the load calculation period for calculating the load in the washing tub, as the load or the load of the washing tub increases, the acceleration period from the first speed to the second speed or the deceleration period from the second speed to the first speed is controlled to become smaller. A laundry processing device characterized by controlling such that, during a load calculation period for calculating the load in the washing tub, the acceleration period from the first speed to the second speed or the deceleration period from the second speed to the first speed becomes larger as the load or the load of the washing tub decreases.
In paragraph 1, The above control unit is, A laundry processing device characterized by controlling the motor to drive according to a second speed pattern during a load calculation period for load calculation within the washing tub, accelerating from a first speed that is not zero to a second speed, maintaining the second speed, and decelerating from the second speed to the first speed.
In paragraph 1, The above control unit is, A laundry processing device characterized by controlling the motor to drive according to a third speed pattern during a load calculation period for load calculation within the washing tub, accelerating from a non-zero first speed to a second speed, decelerating from the second speed to the first speed, and maintaining the first speed.
In paragraph 1, The above control unit is, A laundry processing device characterized by controlling the motor to drive according to a fourth speed pattern during a load calculation period for load calculation within the washing tub, accelerating from a non-zero first speed to a second speed, maintaining the second speed, decelerating from the second speed to the first speed, and maintaining the first speed.
In Paragraph 12, The above control unit is, As the above amount of material or the load of the washing tub increases, the control is made so that the second speed maintenance period increases, and A laundry processing device characterized by controlling the second speed maintenance period to decrease as the load of the above-mentioned load or the load of the above-mentioned washing tub decreases.
In paragraph 1, The above control unit is, Based on the load pattern of the washing tub above, a machine angle that repeats in the load pattern is calculated, and A laundry processing device characterized by calculating the number of repetitions of a speed pattern based on the machine angle calculated above.
In Paragraph 16, The above control unit is, After the above second speed acceleration, control is performed to maintain the above second speed, and A laundry processing device characterized by controlling the maintenance period of the second speed to vary according to the above amount of material or the load of the washing tub.
In paragraph 1, A laundry processing device characterized by the fact that, when driven according to the first speed pattern, the acceleration period during acceleration to the second speed or the deceleration period during deceleration to the first speed is varied according to the amount of material in the washing tub.
In paragraph 1, A laundry processing device characterized by the fact that, when driven according to the first speed pattern, the acceleration slope during acceleration to the second speed or the deceleration slope during deceleration to the first speed is varied according to the amount of material in the washing tub.
Casing; A washing tub disposed within the above casing and having a plurality of lifts formed on its inner surface; A door attached to the above casing and opened/closed; A motor that rotates the washing tub; A control unit for controlling the above motor; including The above control unit is, Accelerate from a first speed that is not zero to a second speed, and decelerate from the second speed to the first speed, Based on the motor torque and speed change amount during acceleration and deceleration, the inertia of the washing tub or the amount of material inside the washing tub is calculated, and The above control unit is, When the load increases in the load pattern of the washing tub above, control is made to accelerate from the first speed to the second speed, and A laundry processing device characterized by controlling the speed to decrease from the second speed to the first speed when the load is reduced in the load pattern of the washing tub.

Description

Laundry treatment machine The present invention relates to a laundry processing device, and more specifically, to a laundry processing device capable of accurately calculating the load even when the load fluctuates. Generally, a laundry processing device performs washing by utilizing the frictional force between the washing tub, which rotates by receiving driving force from a motor, and the laundry when detergent, washing water, and laundry are placed inside the washing tub, thereby producing a washing effect with minimal damage to the laundry and preventing the laundry from tangling together. Meanwhile, since washing, rinsing, and spin-drying are performed based on the amount of laundry within the laundry processing machine, the amount calculation is important. For calculating the amount, Korean Published Patent Application No. 10-2005-0023962 (hereinafter, Prior Art 1) discloses a method of calculating the moment of inertia based on the duty cycle and angular velocity of a pulse width variable control signal while accelerating, maintaining a constant speed, and stopping the motor. However, according to prior art 1, since the motor is accelerated and stopped after constant speed, the amount calculation period is increased, and there is a disadvantage that it is difficult to calculate the amount accurately when the load fluctuates periodically. Meanwhile, Korean Patent Publication No. 10-2005-0038792 (hereinafter referred to as Prior Art 2) discloses a method for accelerating and stopping a motor and calculating the amount of volume based on voltage and the amount of rotation of the motor. However, according to prior art 2, since the motor is stopped after acceleration, the calculation period for the amount of material increases, and there is a disadvantage that it is difficult to calculate the amount of material accurately when the load fluctuates periodically. Meanwhile, Korean Patent Publication No. 10-2008-0102611 (hereinafter referred to as Prior Art 3) discloses a method of accelerating a motor and calculating the amount of material using the time required for motor acceleration. However, according to prior art 3, there is a disadvantage that it is difficult to accurately calculate the amount when the load fluctuates periodically. FIG. 1 is a perspective view illustrating a laundry processing device according to one embodiment of the present invention. Figure 2 is an internal block diagram of the laundry processing device of Figure 1. Figure 3 is an internal circuit diagram of the motor drive unit of Figure 2. Figure 4 is an internal block diagram of the inverter control unit of Figure 3. FIG. 5a is a flowchart illustrating the operation method of a laundry processing device. FIG. 5b is a flowchart illustrating motor operations that can be performed in any one of the strokes of FIG. 5a. FIG. 6 is a timing diagram illustrating motor operation related to the present invention. Figure 7 is a diagram illustrating the AC load pattern of a washing tub. FIG. 8 is a drawing illustrating a speed pattern according to an embodiment of the present invention corresponding to an AC load pattern of a washing tub. FIG. 9 is a flowchart illustrating the operation method of a laundry processing device according to an embodiment of the present invention. FIGS. 10a to 10d are flowcharts illustrating a method of operating a motor according to various embodiments of the present invention. FIGS. 11 to 12d are drawings referenced in the description of FIGS. 9 to 10d. FIG. 13 is a flowchart illustrating the operation method of a laundry processing device according to another embodiment of the present invention. FIGS. 14a to 14e are drawings referenced in the description of FIG. 13. The present invention will be described in more detail below with reference to the drawings. The suffixes "module" and "part" for components used in the following description are assigned solely for the ease of drafting this specification and do not inherently confer any particularly significant meaning or role. Accordingly, the terms "module" and "part" may be used interchangeably. FIG. 1 is a perspective view illustrating a laundry processing device according to one embodiment of the present invention. Referring to FIG. 1, a laundry processing device (100) according to one embodiment of the present invention is a front-load type laundry processing device in which a cloth is inserted into a washing tub in the front direction. Referring to the drawings, the laundry processing device (100) is a drum-type laundry processing device and includes a casing (110) that forms the exterior of the laundry processing device (100), a washing tub (120) that is disposed inside the casing (110) and supported by the casing (110), a drum (122) that is disposed inside the washing tub (120) and is a washing tub for washing clothes, a motor (130) that drives the drum (122), a washing water supply device (not shown) that is disposed outside the cabinet body (111) and su