WO2024004730A1

WO2024004730A1 - Washing machine

Info

Publication number: WO2024004730A1
Application number: PCT/JP2023/022547
Authority: WO
Inventors: 真吾皆本; 陽子賀門; 昊孫; 紘太郎宇美
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2022-06-28
Filing date: 2023-06-19
Publication date: 2024-01-04
Also published as: JP2024003865A

Abstract

A washing machine according to the present disclosure comprises a drum that accommodates laundry and rotates, and a motor that is energized to rotationally drive the drum. Further, the washing machine according to the present disclosure comprises: a current detecting unit for detecting a current conducted to the motor; a voltage detecting unit for detecting a voltage applied to the washing machine; and a control device for controlling the rotation of the motor. The control device is configured to be capable of executing a fabric quantity detecting step for determining a quantity of laundry accommodated in the drum on the basis of a current value detected by the current detecting unit. Further, the control device executes the fabric quantity detecting step if a value of the voltage detected by the voltage detecting unit is equal to or less than a first voltage value.

Description

washing machine

The present disclosure relates to a washing machine.

For example, Patent Document 1 discloses a washing machine having a cloth amount sensor for detecting the amount of cloth, which is the amount of laundry loaded into a drum.

The washing machine in Patent Document 1 includes a drum that accommodates laundry and performs rotational movement, a water tank containing the drum and elastically supported within the washing machine body, and a fluid balancer located in the water tank and provided on the drum. and. Further, the washing machine in Patent Document 1 includes a motor that rotationally drives a drum, a current detection section that detects a current applied to the motor, and a control section that controls rotation of the motor. The control section has a first detection process and a second detection process. In the first detection step, the control unit accelerates the rotation of the drum by generating acceleration torque in the motor, and controls the motor torque so that the angular acceleration during acceleration of the drum is constant in a predetermined acceleration section. do. Further, in the first detection step, the control unit detects an acceleration current value Iq1' that is applied to the motor in an integral multiple rotation period of at least one rotation of the drum. In the second detection step, the control unit decelerates the rotation of the drum by generating a deceleration torque in the motor after the first detection step, and increases the angular acceleration during deceleration of the drum in a predetermined deceleration section. The motor torque is controlled to keep it constant. Further, in the second detection step, the control unit detects a deceleration current value Iq2' that is applied to the motor in an integral multiple rotation period of at least one rotation of the drum. Further, the control section includes cloth amount detection means for detecting the amount of cloth based on the acceleration current value Iq1' and the deceleration current value Iq2'.

Japanese Patent Application Publication No. 2014-54498

The present disclosure provides a washing machine that can suppress the influence caused by the regenerated power of the motor in the cloth amount detection process.

A washing machine in the present disclosure includes a drum that accommodates laundry and rotates, and a motor that rotates the drum by applying electricity. The washing machine also includes a current detection section that detects a current flowing through the motor, a voltage detection section that detects a voltage applied to the washing machine, and a control device that controls rotation of the motor. The control device is configured to be able to execute a cloth amount detection step of determining the amount of laundry contained in the drum based on the current value detected by the current detection section. Further, the control device executes the cloth amount detection step when the value of the voltage detected by the voltage detection section is equal to or less than the first voltage value.

The washing machine according to the present disclosure can suppress the influence caused by the regenerated power of the motor in the cloth amount detection process.

A sectional view showing a schematic configuration of a washing machine in Embodiment 1 A circuit diagram showing a schematic configuration of a washing machine control device in Embodiment 1 Flowchart showing the operation of the washing machine's cloth amount detection process in the first embodiment

(Findings, etc. that formed the basis of this disclosure)
At the time when the inventors came up with the present disclosure, there were known washing machines that controlled the motor torque using a control means and detected the amount of laundry based on the current flowing through the motor. In the control board used as the control means, due to the voltage applied to the washing machine and the regenerated power generated when the motor rotates, the DC voltage applied to the control board is higher than the guaranteed voltage of the electronic components included in the control board. If it exceeded the limit, there was a risk that electronic components would be adversely affected.

The inventors discovered that in areas where the AC (Alternating Current) voltage of the commercial power supply supplied to houses etc. is unstable, the voltage value of the AC voltage outside the washing machine fluctuates, so the motor is controlled to generate regenerative power. We discovered that it is difficult to suppress the negative effects on electronic components by simply suppressing them. In addition, the inventors found that even when selling the same washing machine to multiple regions with different commercial power AC voltage values, simply controlling the motor and suppressing regenerated power may have a negative impact on electronic components. We discovered that it is difficult to suppress the In order to solve these problems, the inventors have constructed the subject matter of the present disclosure.

Hereinafter, an embodiment as an example of the present disclosure will be described based on the drawings. Note that the present disclosure is not limited to this embodiment.

(Embodiment 1)
Embodiment 1 will be described below using FIGS. 1 to 3. In this embodiment, an example of a drum-type washing machine will be described as the washing machine 100.

[1-1. Washing machine configuration]
FIG. 1 is a sectional view showing a schematic configuration of a washing machine 100 according to the present embodiment. Below, the vertical direction in the state where washing machine 100 is installed (hereinafter also referred to as "installation state") as shown in FIG. 1 may be described as the up-down direction. In addition, in the installed state, the side of the main body 1 of the washing machine 100 where the door 5 is present may be referred to as the front side, and the opposite side may be referred to as the back side.

In the main body 1 of this washing machine 100, a water tank 2 is supported in a suspended state by a suspension structure (not shown) having a vibration-proof structure. Inside the water tank 2, a rotatable drum 3, which is formed into a cylindrical shape with a bottom and accommodates laundry, is supported with its axial direction inclined downward from the front side to the back side. Note that the laundry is not limited to clothing, and may also be cloth or leather products such as bedding, curtains, rugs, shoes, or other items that can be washed and dried.

A donut-shaped fluid balancer 15 having a plurality of storage chambers is provided on the front side of the water tank 2 and is directly connected to the drum 3. The fluid balancer 15 has a plurality of storage chambers containing a liquid with a large specific gravity (for example, an aqueous calcium chloride solution), and is separated into a plurality of chambers in the radial direction, and has a communication hole in a partition plate, so that it can be used to The deviation is detected and the laundry is injected into the storage chamber on the opposite side of the detected deviation. As a result, when the eccentric load of the laundry in the drum 3 is on one side of the drum 3, the fluid is moved to the opposite side of the eccentric load, correcting the bias, and reducing vibration noise when the drum 3 rotates. .

A clothing entrance/exit 4 is formed on the front side of the water tank 2 and communicates with the open end of the drum 3. The user loads the laundry into the drum 3 through the clothes entrance 4 by opening and closing the door 5, which is provided on the upwardly inclined surface on the front side of the main body 1 of the washing machine 100. can be taken in and taken out.

The drum 3 has a large number of through holes 6 formed on its circumferential surface that communicate with the inside of the water tank 2, and stirring protrusions 19 for stirring clothes are provided at a plurality of positions on the inner circumferential surface. This drum 3 is rotated in forward and reverse directions by a motor 7 attached to the lower part of the water tank 2. The rotation of the motor 7 is transmitted via a belt 16 to a pulley 18 fixed to a rotating shaft 17 of the drum 3.

Furthermore, a water supply pipe 8 and a drainage pipe 9 are connected to the water tank 2, and water is supplied to and drained from the water tank 2 by controlling a water supply valve 27 and a drain valve 28.

A user opens the door 5, puts laundry and detergent into the drum 3, and starts operation by operating the operation panel 10 provided at the upper front of the main body 1 of the washing machine 100. Then, by opening the water supply valve 27, a predetermined amount of water is supplied into the water tank 2 from the water supply pipe 8, and by rotating the motor 7, the drum 3 is rotationally driven and the washing process is started.

As the drum 3 rotates, the laundry stored in the drum 3 is lifted in the rotational direction by the stirring protrusion 19 provided on the inner peripheral wall of the drum 3, and the stirring operation of dropping from the lifted appropriate height position is repeated. As a result, the laundry is subjected to the action of washing by beating.

After the required washing time, the drain valve 28 opens, and the dirty laundry liquid is discharged from the drain pipe 9. The washing liquid contained in the laundry is dehydrated by the dehydration operation that rotates the drum 3 at high speed, and then A rinsing step is performed by supplying water into the water tank 2 from the water supply pipe 8.

In this rinsing step as well, the laundry housed in the drum 3 is lifted by the stirring protrusions 19 and dropped by the rotation of the drum 3, and the stirring operation is repeated to perform rinsing.

Further, inside the motor 7, a rotation detection section 14 composed of a position detection element and the like that detects the position of the rotor of the motor 7 is provided in order to detect the rotation state thereof.

Additionally, this washing machine 100 is provided with a function of drying the laundry stored in the drum 3. The washing machine 100 exhausts the air in the water tank 2 into the circulating air passage 11 by driving the blower fan 12 , and then sends the air, which has been dehumidified, heated and dried by the heat pump 29 , through the lint filter 13 . Air is again blown into the aquarium 2 through the aquarium.

FIG. 2 is a circuit diagram showing a schematic configuration of control device C of washing machine 100 in this embodiment. Although not particularly shown in FIG. 1, the control device C is built into the main body 1 of the washing machine 100, and the control device C includes a control board 43 shown in FIG. In the control device C shown in FIG. 2, the control board 43 rectifies the AC voltage of the commercial power supply 20 using the rectifier 21, and uses the DC voltage smoothed by the smoothing circuit consisting of the choke coil 22 and the smoothing capacitor 23 as a driving source. The motor 7 is rotationally driven by the inverter circuit 24.

Further, the control board 43 controls the rotation of the motor 7 based on driving instructions input from the operation panel 10 and monitoring information of the driving state detected by each detection means. Further, the control board 43 controls the operation of the water supply valve 27 , the drain valve 28 , the ventilation fan 12 , and the heat pump 29 using the load drive unit 26 .

The motor 7 includes a stator having three-

phase windings

7a, 7b, and 7c, and a rotor having two-pole permanent magnets, and is configured as a DC brushless motor provided with three

position detection elements

30a, 30b, and 30c. . The rotation of the motor 7 is controlled by an inverter circuit 24 under PWM (Pulse Width Modulation) control configured by switching elements 24a to 24f.

The rotor position detection signals detected by the

position detection elements

30a, 30b, and 30c are input to a control section 31 composed of a microcomputer (not shown). The control unit 31 controls the energization of the three-

phase windings

7a, 7b, and 7c of the stator by controlling the on/off states of the switching elements 24a to 24f using PWM control using the drive circuit 32 based on this rotor position detection signal. to rotate the rotor at the required rotational speed.

The control section 31 has a rotation speed detection section 33 into which rotor position detection signals from the three

position detection elements

30a, 30b, and 30c are input. The rotational speed detection unit 33 detects the period every time the state of a signal from one of the three

position detection elements

30a, 30b, and 30c changes, and calculates (detects) the rotational speed of the rotor from the period. The detection output (detected rotation speed of the rotor) of the rotation speed detection section 33 is output to the cloth amount detection section 34, and the laundry amount detection section 34 adjusts the laundry as described below based on the detected rotation speed. The amount of cloth is detected.

The voltage detection unit 36 detects the voltage by, for example, dividing the voltage of the smoothing capacitor 23 using a resistor, etc., and inputting the divided voltage to the microcomputer. Thereby, when the motor 7 is not rotating, the AC voltage of the commercial power source 20 is indirectly detected. Note that the AC voltage of the commercial power supply 20 corresponds to an example of "the voltage applied to the washing machine" in the present disclosure.

The current detection unit 35 is composed of, for example, a shunt resistor and a circuit built into a microcomputer. The current detection unit 35 detects the current flowing through the motor 7.

Note that the detection output of the rotation speed detection section 33 (rotation speed of the rotor) corresponds to the rotation speed of the drum 3, so in the following explanation, the rotation speed of the drum 3 is obtained from the detection output of the rotation speed detection section 33. It is.

[1-2. Cloth amount detection processing operation]
As shown in FIG. 2, the control board 43 is configured as a board on which a plurality of electronic components having different guaranteed voltages are mounted, and a microcomputer and the like are mounted thereon. The electronic component is, for example, the smoothing capacitor 23. In order not to adversely affect electronic components, the DC voltage applied to the control board 43 may be made lower than the guaranteed voltage by the voltage applied to the washing machine 100 and the regenerated power generated when the motor 7 rotates. . In the present embodiment, when the DC voltage component of the control board 43 is higher than the guaranteed voltage in the cloth amount detection process, the cloth amount detection process that generates large regenerative power is not performed. That is, in this embodiment, when the voltage of the smoothing capacitor 23 is larger than a predetermined value when the commercial power supply 20 is applied and the motor 7 is not rotating, a cloth amount detection step is performed in which large regenerative power is generated. I try not to do it.

The cloth amount detection process detects and/or determines the amount of laundry such as clothes put into the drum 3 (hereinafter also simply referred to as "cloth amount"), and determines the washing time etc. according to the amount of cloth. It is processing. When the laundry is loaded into the drum 3 and an instruction to start a washing operation is input through the operation panel 10, the amount of laundry detection process is started. The cloth amount detection process will be described below based on FIG. 3.

FIG. 3 is a flowchart showing the operation of the cloth amount detection process of washing machine 100 in the first embodiment.

As shown in FIG. 3, when the cloth amount detection process starts (step S1), the control device C detects the AC voltage applied to the washing machine 100 using the voltage detection section 36 built in the control section 31. is detected (step S2). In step S2, since the commercial power supply 20 is applied and the motor 7 is not rotating, the AC voltage of the commercial power supply 20 applied to the main body 1 of the washing machine 100 is detected by detecting the voltage of the smoothing capacitor 23. Can be detected.

Control device C determines whether the AC voltage applied to washing machine 100 is less than or equal to the first voltage value (step S3).

The first voltage value in this embodiment is a value that is predetermined to be larger than the rated voltage of washing machine 100, and is set as a value that is 1.06 times the rated voltage, for example. For example, if the rated voltage of washing machine 100 is 100V, the first voltage value is set as 106V.

If the value of the AC voltage exceeds the first voltage value (step S3, No), the control device C does not perform the cloth amount detection step using the motor torque and determines the cloth amount without using the current value. A cloth amount determination step is performed (step S4). In the washing machine 100 according to the present embodiment, as a cloth amount determination step in which the current value of the motor 7 is not used for determination, the cloth amount determination process is performed by assuming that the value of the cloth amount is a predetermined first cloth amount value. Implement the process. The first cloth amount value in this embodiment is the maximum load, that is, the value of the maximum amount of cloth that can be washed by washing machine 100. When the amount of cloth is determined to be the maximum amount of cloth that can be washed by the washing machine 100, the amount of detergent, water, and mechanical power to be added are set to the maximum, so the cleaning performance can be improved regardless of the actual amount of cloth. can be secured. Note that the first cloth amount value may be half the maximum amount of cloth that can be washed with the washing machine 100, or the average value of the amount of cloth detected in the cloth amount detection step during past washing. . In this case, it is possible to reduce the possibility that the amount of detergent, the amount of water, and the mechanical force to be added will be excessive with respect to the actual amount of cloth. When the cloth amount determination process ends, the control device C ends the cloth amount detection process.

If the value of the AC voltage is less than or equal to the first voltage value (Step S3, Yes), the control device C applies a predetermined voltage to the three-

phase windings

7a, 7b, and 7c of the motor 7 to adjust the temperature of the motor 7. is detected (step S5), and a temperature correction coefficient is calculated.

Next, the control device C performs a low-speed rotation process, and then performs a cloth amount detection process. In the low-speed rotation process, the control device C starts the drum 3 from a stationary state by causing the motor 7 to generate acceleration torque, and accelerates the motor 7 to a predetermined rotation speed N1 (for example, 440 r/min) (step S6). Next, the control device C performs a cloth amount detection process following the low speed rotation process.

After a predetermined period of time has elapsed since the start of the process in step S6, or after a predetermined rotational speed has been reached (though not particularly shown in FIG. 3) (step S7, Yes), the control device C starts the cloth amount detection step. The cloth amount detection process consists of a first detection process and a second detection process. First, vector control is performed so that the rotation of the drum 3 is accelerated by the motor 7 at a predetermined angular acceleration α1, and a first detection step is performed in which the drum 3 is accelerated from the rotational speed N1 to N2 (step S8).

In the first detection step, the control device C detects the current applied to the motor 7 by the current detection section 35, and detects the current in the period in which the drum 3 rotates by an integral multiple of at least one rotation in the first detection period. Calculate the average value or integrated value of the value Iq1.

In this way, by using the average value or integrated value of the current value Iq1 during one rotation (rotation of 360 degrees) of the drum 3, it is possible to offset up and down fluctuations in the current value due to the unbalanced state of the laundry. Therefore, by using the current value in an integer multiple rotation interval of at least one revolution of the drum 3 as the cloth amount judgment value, the up and down fluctuations in the current value due to the unbalanced state of the laundry can be canceled out, and the variations in the cloth amount judgment value can be reduced. Can be suppressed.

When a predetermined period of time has elapsed from the start of the process in step S8 or when the drum 3 reaches the rotational speed N2 (step S9, Yes), the control device C calculates the current value Iq1 during one revolution of the drum 3 (step S10), the first detection step is finished.

After the first detection step is completed, a second detection step is performed (step S11). In the second detection step, the control device C decelerates the rotational speed of the drum 3, and then performs vector control using the motor 7 to decelerate the rotation of the drum 3 at a predetermined angular acceleration α2. The rotational speed is reduced from N3 to N4.

When the rotational speed of the drum 3 reaches N4 (step S12, Yes), the control device C executes the following process. That is, the control device C detects the current applied to the motor 7 by the current detection unit 35, and determines the average value or integrated value of the current value Iq2 in the rotation period of an integer multiple of at least one rotation of the drum 3 in the deceleration period. is calculated (step S13), and the second detection step is completed.

Next, the control device C performs motor induced voltage correction (step S14) and temperature correction (step S15) based on the difference between the calculated current values Iq1 and Iq2.

Finally, the control device C determines the amount of cloth from the relationship between the calculated current value difference (Iq1-Iq2) and a predetermined cloth amount value (step S16), and performs the cloth amount detection step and cloth amount detection. The process ends (step S17). Note that the relationship between the current value difference (Iq1-Iq2) and the cloth amount value may be stored in the control device C as a table (that is, a combination of the current value difference and the cloth amount value), It may be stored as a calculation formula.

As described above, in the present embodiment, the washing machine 100 determines whether or not the cloth amount detection step can be executed based on the value of the AC voltage input to the washing machine 100, and executes the cloth amount detection step. If not, a cloth amount determination step that does not use motor torque is executed. Thereby, washing machine 100 can suppress the adverse effects of regenerated power on electronic components in the cloth amount detection process where there is a high possibility that large regenerated power will be generated. Furthermore, even if the washing machine 100 generates large regenerative power due to the unbalanced state of the laundry or the induced voltage constant of the motor 7, the washing machine 100 does not execute the cloth amount detection process using the motor torque, so the regenerative power is It is possible to suppress the negative effects of

[1-3. Effects, etc.]
As described above, in this embodiment, washing machine 100 includes drum 3 that stores laundry and rotates, and motor 7 that rotates drum 3 by applying electricity. The washing machine 100 also includes a current detection unit 35 that detects the current flowing to the motor 7, a voltage detection unit 36 that detects the AC voltage of the commercial power supply 20 applied to the washing machine 100, and a rotation of the motor 7. A control device C that controls the. The control device C is configured to be able to execute a cloth amount detection step of determining the amount of laundry contained in the drum 3 based on the current value detected by the current detection unit 35. Further, the control device C executes the cloth amount detection step when the value of the voltage detected by the voltage detection unit 36 is equal to or less than the first voltage value.

As a result, if the voltage applied to the control board 43 is at a value that does not adversely affect the electronic components mounted on the control board 43, due to the voltage applied to the washing machine 100 and the regenerated power generated when the motor 7 rotates. In this step, a cloth amount detection step in which regenerative power is generated can be performed. That is, the washing machine 100 can suppress the influence caused by the regenerated power of the motor 7 in the cloth amount detection process.

As in the present embodiment, when the voltage value detected by the voltage detection section 36 exceeds the first voltage value, the control device C performs washing without using the current value detected by the current detection section 35. You may perform the cloth amount determination process of determining the cloth amount of an object.

As a result, if there is a possibility that the AC voltage value may have an adverse effect on the electronic components mounted on the control board 43, the control device C can detect the AC voltage value based on the preset correspondence relationship without performing the cloth amount detection process. Determine the amount of cloth. Therefore, washing machine 100 does not generate regenerated power in the cloth amount detection process. In other words, the washing machine 100 is not affected by the regenerated power of the motor 7 in the cloth amount detection process.

As in the present embodiment, the control device C may determine the amount of laundry stored in the drum 3 to be the first amount of laundry in the amount of laundry determination step.

As a result, even if the AC voltage value may have an adverse effect on the electronic components mounted on the control board 43, the control device C can control the amount of detergent and water to be added, and the amount of water in the machine without generating regenerative power. The force can be easily set.

As in the present embodiment, the first cloth amount value may be the value of the maximum amount of cloth that can be washed in the washing machine 100.

As a result, since the amount of cloth is considered to be the maximum load (the value of the maximum amount of cloth), the amount of detergent, the amount of water, and the mechanical force to be added are set to the maximum, and the washing machine 100 loads the actual amount of cloth. Cleaning performance can be ensured regardless of the amount.

(Other embodiments)
As described above, Embodiment 1 has been described as an example of the technology in the present disclosure. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments in which changes, replacements, additions, omissions, etc. are made. Furthermore, it is also possible to create a new embodiment by combining the components described in the first embodiment.

Therefore, other embodiments will be illustrated below.

In Embodiment 1, as an example of the motor of the present disclosure, a configuration has been described in which the rotation of the motor 7 is transmitted to the pulley 18 fixed to the rotating shaft 17 of the drum 3 via the belt 16. The motor of the present disclosure is not limited to this, since it is sufficient to rotate the drum of the present disclosure. The motor of the present disclosure may be configured to be directly connected to and driven by the rotating shaft of the drum of the present disclosure.

In Embodiment 1, a drum-type washing machine 100 was described as an example of the washing machine of the present disclosure. The washing machine of the present disclosure is not limited to the drum-type washing machine as in Embodiment 1, but may be a washing/drying machine with a drying function or a vertical washing machine.

In Embodiment 1, the voltage detection unit 36 was described as an example of the voltage detection unit of the present disclosure. The voltage detection unit of the present disclosure only needs to detect the voltage applied to the washing machine of the present disclosure when driving the motor of the present disclosure, so it is limited to a configuration that indirectly detects the AC voltage of the commercial power source 20. Not done. The voltage detection unit of the present disclosure may be configured to directly detect the AC voltage of the commercial power supply 20.

In Embodiment 1, as an example of the washing machine of the present disclosure, a cloth amount determination step of determining the amount of cloth by assuming that the amount of cloth is a predetermined amount has been described. The cloth amount determination process of the present disclosure that does not use the current value of the motor for determination does not need to be a cloth amount detection process that uses motor torque, so the cloth amount determination process assumes that the cloth amount is a predetermined cloth amount. It is not limited to the process of The cloth amount determining step of the present disclosure that does not use the current value of the motor for determination may be, for example, a step of detecting the vibration of the water tank 2 using a vibration detection means and determining the cloth amount. In this step, for example, it may be determined that the larger the vibration value is, the larger the amount of cloth is. Note that the vibration detection means may be, for example, a 3D sensor that detects vibrations in three axes, or a spring meter that detects displacement due to expansion and contraction of a spring.

In Embodiment 1, the amount of laundry detection process for detecting the amount of laundry was described as an example of the process of suppressing the generation of regenerated power. A similar problem will occur if the process of the present disclosure generates regenerative power by energizing the motor, so the present disclosure can be applied to processes other than cloth amount detection processing.

In the first embodiment, the configuration in which the control device C includes the current detection unit 35 and the voltage detection unit 36 has been described, but the washing machine 100 includes the current detection unit 35 and the voltage detection unit as an external configuration separate from the control device C. A section 36 may also be provided. That is, a washing machine according to the present disclosure may include a washing machine in which the current detection unit according to the present disclosure, the voltage detection unit according to the present disclosure, and the control device according to the present disclosure that controls the rotation of the motor according to the present disclosure are implemented as one control device. include.

The present disclosure is applicable to, for example, drum-type or vertical-type washing machines or washer-dryers. Specifically, it is applicable to, for example, a domestic washing machine, a domestic washer/dryer, a commercial washing machine, a commercial washer/dryer, and the like.

1 Main body 2 Water tank 3 Drum 4 Clothes entrance 5 Door 6 Hole 7 Motor 7a Three-phase winding 7b Three-phase winding 7c Three-phase winding 8 Water supply pipe 9 Drainage pipe 10 Operation panel 11 Circulating air passage 12 Blower fan 13 Lint filter 14 Rotation detection section 15 Fluid balancer 16 Belt 17 Rotating shaft 18 Pulley 19 Stirring protrusion 20 Commercial power supply 21 Rectifier 22 Choke coil 23 Smoothing capacitor 24 Inverter circuit

24a Switching element

24b Switching element

24c Switching element

24d Switching element

24e Switching element 24 f switching Element 26 Load drive unit 27 Water supply valve 28 Drain valve 29 Heat pump 30a Position detection element 30b Position detection element 30c Position detection element 31 Control unit 32 Drive circuit 33 Rotation speed detection unit 34 Cloth amount detection unit 35 Current detection unit 36 Voltage detection unit 43 Control board 100 Washing machine C Control device Iq1 Current value Iq1' Current value during acceleration Iq2 Current value Iq2' Current value during deceleration N1 Rotational speed N2 Rotational speed N3 Rotational speed α1 Angular acceleration α2 Angular acceleration

Claims

A drum that stores laundry and rotates,
a motor that rotates the drum by energization;
a current detection unit that detects the current applied to the motor;
a voltage detection unit that detects the voltage applied to the washing machine;
A control device that controls rotation of the motor,
The control device includes:
configured to be able to execute a cloth amount detection step of determining the amount of laundry contained in the drum based on the current value detected by the current detection section,
If the value of the voltage detected by the voltage detection unit is less than or equal to a first voltage value, executing the cloth amount detection step;
A washing machine characterized by:
The control device controls the amount of laundry to be washed without using the current value detected by the current detection unit when the voltage value detected by the voltage detection unit exceeds the first voltage value. Executing the cloth amount determination step,
The washing machine according to claim 1, characterized in that:
In the cloth amount determining step, the control device determines that the amount of laundry contained in the drum is a first cloth amount value.
The washing machine according to claim 2, characterized in that:
The first cloth amount value is the maximum amount of cloth that can be washed in the washing machine.
The washing machine according to claim 3, characterized in that: