JP2008148921A - Rotating body control device and washing machine having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating body control device surely exerting a vibration suppression effect by balancing means in a rotating body with a plurality of balancing means. <P>SOLUTION: This rotating body control device includes: a rotation speed measuring means 31 having at least two or more balancing means each of which has a race provided integrally and concentrically with the rotating body and rolling elements stored in the race movably driven by the rotation of the rotating body, and measuring the rotation speed of the rotating body; a detection means 32 for detecting the rotation speed; an analysis means 33 for analyzing the fluctuation state of the rotation speed and calculating an unbalanced weight; and a control means 34 for controlling the rotation of the rotating body based on the unbalanced weight. The analysis means 33 analyzes the fluctuation state of the rotating body, when the rotation speed of the rotating body is lower than the rotation speed when the respective rolling elements stored in all the balancing means or balancing means other than a single balancing means start moving. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotating body control device that controls the operation of a rotating body that has a possibility of occurrence of an eccentric state that occurs during rotation, that is, an unbalance, and a washing machine including the same.

  An example of the rotating body in which the above-described unbalance occurs is a spin basket of a washing machine. In the dehydration process of the washing machine, the laundry in the spin basket is unevenly arranged along the inner periphery of the spin basket, and the unbalance occurs. When the spin basket is rotated at a high speed in this state, a biased force is applied to the rotation axis of the spin basket and a large vibration is generated.

In order to prevent such vibration due to unbalance, a washing machine provided with balancing means having a race concentrically provided with the spin basket and a plurality of rolling elements housed together with oil in the race is proposed. (For example, refer to Patent Document 1).
In this washing machine, when the spin basket is rotated at a high speed, it is possible to prevent the rolling elements from automatically moving in the race so as to cancel the imbalance and applying a biased force to the rotating shaft.

Further, in such a washing machine, a plurality of balancing means are provided in order to cancel the unbalance generated at both ends of the spin basket or to increase the number of rolling elements.
Japanese Patent Laid-Open No. 10-43472

By the way, in the washing machine equipped with the balancing means described above, when the unbalanced weight is larger than the total weight of the rolling elements by a predetermined amount or more, the rolling elements are positioned on the opposite side (reverse phase) of the unbalance in the circumferential direction. However, the imbalance cannot be canceled out sufficiently and vibrations are generated constantly. The unbalanced weight is the amount of eccentricity of the rotating body that occurs during rotation.
Therefore, it is necessary to accurately grasp the unbalanced weight generated in the rotating body and control the rotating operation of the rotating body.

Here, in a rotating body not provided with a balancing means, the unbalance rotates together with the rotating body, resulting in fluctuations in the rotational speed, and the unbalanced weight can be estimated from the magnitude of the amplitude of this speed fluctuation. .
However, when a plurality of balancing means are provided as described above, since the operating states of the rolling elements housed in the plurality of balancing means are different from each other, the rotational speed changes in a complicated manner, and the unbalanced weight is reduced. It was difficult to calculate.

  The present invention has been made in view of the above circumstances, and in a rotating body including a plurality of balancing means, a rotating body control device capable of reliably achieving the vibration suppression effect by the balancing means and the same are provided. The purpose is to provide a washing machine.

  In order to achieve this object, a rotating body control device according to the present invention is a rotating body control device that controls a rotating operation of a rotating body that is rotatably mounted around a rotating shaft. At least two balancing means including a race having an annular shape provided concentrically with the rotating shaft of the rotating body, and rolling elements housed in the race so as to be movable following the rotating operation of the rotating body. The rotational speed measuring means for measuring the rotational speed of the rotating body, the detecting means for detecting the rotational speed of the rotating body, and the fluctuation state of the rotational speed detected by the detecting means are analyzed. Analyzing means for calculating an unbalanced weight generated in the rotating body; and control means for controlling a rotating operation of the rotating body based on a calculation result of the unbalanced weight by the analyzing means; The analyzing means includes a rotating body having a rotational speed lower than the rotational speed at the start of movement of each of the rolling elements accommodated in all balancing means, or all except one balancing means. When the number of rotations of each of the rolling elements housed in the balancing means is lower than the number of rotations at the start of movement, the fluctuation state of the rotation speed is analyzed.

  In the rotating body control device of this configuration, the detecting means for detecting the rotational speed, the number of rotations at the start of movement of each rolling element housed in all the balancing means, or all balancing means except for one balancing means Analyzing means for analyzing the fluctuation state of the rotational speed at a rotational speed lower than the rotational speed at the start of movement of each of the rolling elements accommodated in the vehicle, and based on the calculation result Since the control means for controlling the rotating body is provided, it is possible to reliably cancel the unbalance by the balancing means, and the steady vibration of the rotating body can be suppressed.

Here, when the fluctuation state of the rotational speed is analyzed at a rotational speed lower than the rotational speed at the start of movement of each of the rolling elements accommodated in all balancing means, as described above, the rotational speed fluctuation The unbalanced weight can be calculated from the magnitude of the amplitude.
In addition, when analyzing the fluctuation state of the rotational speed at a rotational speed lower than the rotational speed at the start of movement of each of the rolling elements accommodated in the balancing means, except for one balancing means, the rotational body unbalance The unbalanced weight can be calculated by detecting the beat of the rotational speed generated based on the fluctuation of the relative position with the rolling element in the one balancing means and analyzing the beat.

  According to the present invention, in a rotating body including a plurality of balancing means, a rotation capable of reliably achieving the vibration suppression effect by the balancing means by calculating the unbalance weight and controlling based on the unbalance weight. A body control device and a washing machine including the same can be provided.

Hereinafter, a washing machine according to a first embodiment of the present invention will be described with reference to the accompanying drawings.
The washing machine 10 in the present embodiment is a drum type washing machine capable of performing a washing process and a dehydrating process. As shown in FIG. 1, the washing machine 10 includes a housing 11, a tab 12 disposed inside the housing 11, and a spin basket 20 (rotary body) provided rotatably inside the tab 12. And a motor 30 for rotating the spin basket 20 around the rotation axis L. Further, the washing machine 10 is provided with at least two balancing means for canceling the unbalance generated in the spin basket 20, and in the present embodiment, the first balancing device 40 and the second balancing device 50 are provided. Two balancing means are provided.

  The tab 12 has a bottomed cylindrical shape, and its central axis is disposed substantially parallel to the horizontal plane, and an opening is disposed on the front side (right side in FIG. 1). The tab 12 is supported inside the housing 11 by a plurality of springs 13 and dampers 14. A bearing 15 that supports a main shaft 24 of the spin basket 20 described later is provided on the bottom surface of the tab 12.

The spin basket 20 disposed inside the tab 12 has a cylindrical side plate 21 and a front plate 22 and a rear plate 23 respectively coupled to the front and rear surfaces of the side plate 21. An opening is formed in the front plate 22 so that the laundry W can be taken in and out of the spin basket 20.
A main shaft 24 that allows the spin basket 20 to rotate about the rotation axis L is provided on the rear side of the rear plate 23 (left side in FIG. 1). The main shaft 24 is pivotally supported by the bearing 15 of the tab 12. Has been. Accordingly, the rotation axis L of the spin basket 20 and the center axis of the tab 12 are arranged to coincide with each other.

The side plate 21 is formed with a plurality of lifters 21A protruding toward the inner peripheral side at equal intervals in the circumferential direction. The lifter 21 </ b> A scrapes up the internal laundry W as the spin basket 20 rotates.
Further, the side plate 21 is provided with a large number of water passage holes 21B communicating the inside of the spin basket 20 with the tab 12, and water injected into the tab 12 during washing is spun through the water passage holes 21B. The water is supplied into the basket 20 and the water dehydrated from the laundry W is discharged to the tub 12 during dehydration.

The motor 30 is, for example, a DC motor 30 and is configured to rotate the main shaft 24 around the rotation axis L thereof.
As shown in FIG. 2, the motor 30 includes a rotation speed sensor 31 that measures the rotation speed of the motor 30 and a speed sensor 32 that measures the rotation speed ω of the motor 30. The operation of the motor 30 is controlled by the motor rotation control unit 34.

As balancing means for canceling the unbalance generated in the spin basket 20, a first balancing device 40 is provided on the front plate 22 of the spin basket 20, and a second balancing device 50 is provided on the rear plate 23 of the spin basket 20. Yes.
As shown in FIG. 3, the first balancing device 40 and the second balancing device 50 include groove-like races 41 and 51 formed concentrically around the rotation axis L of the spin basket 20, and the races 41, 51 includes a plurality of balls 42 and 52 accommodated together with oils 43 and 53. The plurality of balls 42 and 52 are movably arranged in the races 41 and 51 following the rotation of the spin basket 20.

  Then, the balls 42 and 52 accommodated in the first balancing device 40 and the second balancing device 50 move in the races 41 and 51 when the rotation speed N of the spin basket 20 exceeds a predetermined rotation speed. . Here, in the present embodiment, the rotation speed ζ1 at the start of movement of the ball 42 accommodated in the first balancing device 40 and the rotation speed ζ2 at the start of movement of the ball 52 accommodated in the second balancing device 50. And are set differently.

  More specifically, the viscosity of the oil 43 accommodated in the race 41 of the first balancing device 40 is higher than the viscosity of the oil 53 of the second balancing device 50. Then, the frictional force and resistance force acting between the oil 43 and the ball 42 in the first balancing device 40 are increased, and the movement of the ball 42 is promoted. Accordingly, the rotational speed ζ1 at the start of movement of the ball 42 accommodated in the first balancing device 40 is lower than the rotational speed ζ2 at the start of movement of the ball 52 accommodated in the second balancing device 50. Is set.

  Next, operations of the first balancing device 40 and the second balancing device 50 will be described. When the laundry W is put into the spin basket 20 and the spin basket 20 is rotated, the laundry W is disposed so as to stick to a part of the inner peripheral surface of the spin basket 20. As a result, unbalance occurs in the spin basket 20. When the spin basket 20 is rotated at a rotational speed N higher than its natural frequency ν, the plurality of balls 42 and 52 of the first balancing device 40 and the second balancing device 50 automatically move to cancel the unbalance. Placed in.

  On the other hand, when the rotation speed N of the spin basket 20 is lower than the natural frequency ν, the movement speed of the balls 42 and 52 is slower than the unbalance movement speed (rotation speed of the spin basket 20) due to the action of gravity. Thus, the relative position of the unbalance and the balls 42 and 52 in the circumferential direction varies. In the present embodiment, since the first balancing device 40 and the second balancing device 50 are provided, the unbalance, the balls 42 of the first balancing device 40, and the balls 52 of the second balancing device 50 in the circumferential direction are arranged. The relative position varies and affects the rotation speed ω of the motor 30.

Here, the torque τ of the motor 30 is expressed by equation (1). In Equation (1), M _unb : unbalanced weight, M ₁ : total weight of the balls 42 of the first balancing device 40, M ₂ : total weight of the balls 52 of the second balancing device 50, ω _s ; spin basket 20, rotational speed ω ₁ ; rotational speed of the ball 42 of the first balancing device 40, ω ₂ ; rotational speed of the ball 52 of the second balancing device 50, α, β, γ; respective initial phases, g; gravitational acceleration , K: represents a constant.

  As described above, since the circumferential positions of the balls 42 of the first balancing device 40 and the balls 52 of the second balancing device 50 affect the torque τ, the rotational speed ω of the motor 30 varies in a complicated manner. It will be.

  Here, at the rotation speed at which the balls 42 and 52 of the first balancing device 40 and the second balancing device 50 do not move, the balls 42 of the first balancing device 40 and the balls 52 of the second balancing device 50 in the equation (1). Since there is no need to consider the movement, the torque τ can be expressed by equation (2).

  That is, the torque τ varies only due to imbalance, and the rotational speed ω of the motor 30 also varies accordingly. FIG. 4 shows the relationship between the unbalanced circumferential position and the fluctuation of the rotational speed ω of the motor 30. When the unbalance moves upward against gravity, the rotational speed ω decreases, and when it moves downward according to gravity, the rotational speed ω increases. As shown in the equation (2), since the amplitude of the torque τ is proportional to the unbalanced weight, the unbalanced weight can be calculated from the amplitude Δω of the rotational speed ω.

Here, in the present embodiment, as shown in FIGS. 2 and 5, the rotational speed N of the motor 30 is measured by the rotational speed sensor 31, and the rotational speed N of the motor 30 is determined by the balls 42 of the first balancing device 40. It is confirmed that the rotational speed ζ1 at the start of the movement of the second balancing device 50 and the rotational speed ζ2 at the start of the movement of the ball 52 of the second balancing device 50 are lower (N <ζ1, N <ζ2). In this state, the rotational speed ω of the motor 30 is measured by the speed sensor 32 (detection means), and the fluctuation Δω of the rotational speed ω is measured. In the analyzing unit 33, the speed variation analyzing unit 33A analyzes the rotational speed variation Δω, and the unbalanced weight calculating unit 33B calculates the unbalanced weight. Then, the unbalance weight determination unit 33C compares the unbalance weight with the total weight of the balls 42 and 52.
When the unbalance weight is greater than the total weight of the balls 42 and 52 by a predetermined amount η or more, the motor rotation control unit 34 reduces the rotation speed N of the spin basket 20. Thereby, the laundry W stuck to the inner peripheral surface of the spin basket 20 is loosened to correct the imbalance.

  According to the washing machine 10 having this configuration, the speed sensor 32 that detects the rotational speed ω of the motor 30, the speed fluctuation analysis unit 33 </ b> A that analyzes fluctuations in the rotational speed ω, the unbalance weight calculation unit 33 </ b> B, and the unbalance weight And an unbalance weight determination unit 33C for comparing the total weight of the balls 42, and when the unbalance weight is larger than the total weight of the balls 42 by a predetermined amount η or more, the rotational speed N of the spin basket 20 is temporarily set. Since the motor rotation control unit 34 performs control so that the unbalance is corrected by reducing the unbalance, the unbalance can be surely canceled by the first and second balancing devices 40 and 50, and the steady vibration of the dehydration process can be prevented. Occurrence can be reliably prevented.

  Further, the fluctuation of the rotational speed ω of the motor 30 at a rotational speed lower than the rotational speed ζ1 when the ball 42 of the first balancing device 40 starts moving and the rotational speed ζ2 when the ball 52 of the second balancing device 50 starts moving. Therefore, the unbalance weight generated in the spin basket 20 can be reliably calculated.

  In addition, since the first balancing device 40 is provided on the front plate 22 of the spin basket 20 and the second balancing device 50 is provided on the rear plate 23, an unbalance that is biased toward the front side or the rear side of the spin basket 20 occurs. Even in this case, each imbalance can be effectively canceled.

  Next, the washing machine which is the 2nd Embodiment of this invention is demonstrated. In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and detailed description is abbreviate | omitted.

  In the present embodiment, the gap between the race 41 and the ball 42 in the first balancing device 40 is configured to be smaller than the gap between the race 51 and the ball 52 in the second balancing device 50. Then, in the first balancing device 40, the frictional force and resistance force between the oil 43 and the ball 42 are increased, and the movement of the ball 42 is promoted. Thus, in the present embodiment, the rotational speed ζ1 at the start of movement of the ball 42 accommodated in the first balancing device 40 is the rotational speed ζ2 at the start of movement of the ball 52 accommodated in the second balancing device 50. Is set to be lower.

  Here, at the rotation speed N at which only the ball 42 of the first balancing device 40 starts moving and the ball 52 of the second balancing device 50 does not move, that is, the rotation speed satisfying ζ1 ≦ N <ζ2, (1 Since it is not necessary to consider the movement of the ball 52 of the second balancing device 50 in the equation (2), the torque τ can be represented by the equation (3).

That is, the torque τ varies depending on the unbalance and the relative position of the ball 42 of the first balancing device 40. As a result, the amplitude Δω of the rotational speed ω of the motor 30 is periodically changed to generate the beat signal B.
FIG. 7 shows the relationship between the relative position in the circumferential direction of the unbalance and the ball 42 and the beat signal B. Since vibration is suppressed when the unbalance and the ball 42 are arranged in opposite phases in the circumferential direction, the amplitude of the beat signal B (the amplitude Δω of the rotational speed ω of the motor 30) is minimized. On the other hand, when the unbalance and the ball 42 are arranged in the same phase in the circumferential direction, a large force acts on the rotation axis L to increase vibration, so that the amplitude of the beat signal B (the amplitude Δω of the rotation speed ω of the motor 30). ) Is the largest.

Next, a method for calculating the unbalance weight from the beat signal B will be described. The rotational speed ω of the motor 30 is expressed by equation (4). In equation (4), M _unb ; unbalanced weight, M ₁ ; total weight of balls 42 of first balancing device 40, ω _s ; rotational speed of spin basket 20, ω ₁ ; rotational speed of ball 42, α , Β: respective initial phases, J: total amount of inertia, r: turning radius, g: gravitational acceleration, τ: torque of the motor 30.

As described above, the amplitude Δω of the speed ω of the motor 30 is maximized when the unbalance and the ball 42 are arranged in the same phase, and is minimized when arranged in the opposite phase. Therefore, when the expression (4) is specified only for the maximum and minimum, it is expressed as follows.
In the case of the same phase, Δω _max = k ₂ × (M _unb + M ₁ ) (5)
In the case of opposite phase, Δω _miN = k ₂ × | M _umb −M ₁ | (6)
From these formulas (5) and (6), the unbalanced weight (M _unb ) is expressed as follows. Note that k ₁ = 1 / 2k ₂ .
When M _unb > M ₁ , M _unb = k ₁ × (Δω _max + Δω _miN ) (7)
When M _unb <M ₁ , M _unb = k ₁ × (Δω _max −Δω _miN ) (8)
From these equations (7) and (8), the unbalanced weight can be calculated from the beat signal B based on the rotational speed ω of the motor 30.

Here, in this embodiment, as shown in FIGS. 6 and 8, the rotational speed N of the motor 30 is measured by the rotational speed sensor 31, and the rotational speed N of the motor 30 is determined by the ball 42 of the first balancing device 40. It is confirmed that the rotation speed is equal to or higher than the rotation speed ζ1 of the second balancing device 50 and lower than the rotation speed ζ2 when the movement of the ball 52 of the second balancing device 50 starts (ζ1 ≦ N <ζ2). In this state, the speed sensor 32 detects a fluctuation (beat signal B) in the amplitude Δω of the rotational speed ω of the motor 30. In the analysis unit 33, the beat signal B is analyzed by the beat signal analysis unit 33D, and the unbalance weight calculation unit 33B calculates the unbalance weight. Then, the unbalance weight determination unit 33C compares the unbalance weight with the total weight of the balls 42 and 52.
When the unbalance weight is larger than the total weight of the balls 42 and 52 by a predetermined amount η or more, the motor rotation control unit 34 decreases the rotation speed N of the spin basket 20. Thereby, the laundry W stuck to the inner peripheral surface of the spin basket 20 is loosened and the unbalance is corrected.

  According to the washing machine 10 having this configuration, the speed sensor 32 that detects the rotational speed ω of the motor 30, the beat signal analysis unit 33D that analyzes the beat signal B of the rotational speed ω, and the unbalanced weight are calculated from the analysis result. An unbalanced weight calculating unit 33B for comparing the unbalanced weight with the total weight of the balls 42 and 52, and an unbalanced weight determining unit 33C for comparing the unbalanced weight with the total weight of the balls 42 and 52. If it is larger than the above, since the motor rotation control unit 34 performs control so as to temporarily reduce the rotation speed N of the spin basket 20 and correct the unbalance, the effect of suppressing the vibration of the spin basket 20 by the balancing device 40 is ensured. Can be successful.

  In the present embodiment, the gap between the race 41 and the ball 42 in the first balancing device 40 is configured to be smaller than the gap between the race 51 and the ball 52 in the second balancing device 50, and the first balancing device Since the rotational speed ζ1 at the start of the movement of the 40 balls 42 and the rotational speed ζ2 at the start of the movement of the balls 52 of the second balancing device 50 are set to be different, the difference between the gaps can be adjusted by adjusting the gap difference. The difference between the rotational speed ζ1 when the ball 42 of the first balancing device 40 starts moving and the rotational speed ζ2 when the ball 52 of the second balancing device 50 starts moving can be increased.

As mentioned above, although the washing machine which is embodiment of this invention was demonstrated, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
The apparatus provided with the rotating body control device is not limited to a washing machine, and may be other industrial equipment such as a centrifugal separator or a consumer product.

  In the first embodiment, the rotational speed ζ1 at the start of movement of the balls accommodated in the first balancing device and the rotational speed ζ2 at the start of movement of the balls accommodated in the second balancing device are different from each other. As described in the first embodiment, when the rotational speed N is analyzed when the rotational speed N of the spin basket is N <ζ1 and N <ζ2, as in the first embodiment, ζ1 and ζ2 match. It may be.

  In addition, as means for setting the rotational speed ζ1 at the start of movement of the ball accommodated in the first balancing device and the rotational speed ζ2 at the start of movement of the ball accommodated in the second balancing device to be different from each other, In the first embodiment, the oil viscosity is changed, and in the second embodiment, the clearance between the race and the ball is adjusted. However, other means may be used. For example, by changing the weight per ball of the balancing device, it is possible to adjust ζ1 and ζ2 by providing a difference in the magnitude of gravity acting on the ball. Further, the surface roughness of the race inner surface and the surface roughness of the ball may be changed.

Furthermore, in the present embodiment, the description has been made assuming that two balancing devices (means) are provided. However, three or more balancing devices may be provided. In this case, the number of rotations at the start of movement of the balls accommodated in all balancing devices, or the number of rotations lower than the number of rotations at the start of movement of balls accommodated in all balancing devices except one balancing device. Thus, the rotation speed of the motor is analyzed.
Further, the oil is described as being contained in the race of the balancing device, but the present invention is not limited to this, and other fluids such as water and air may be used.

It is a cross-sectional schematic diagram of the washing machine which is the 1st Embodiment of this invention. It is a block diagram of the washing machine shown in FIG. It is a schematic explanatory drawing of the balancing apparatus with which the washing machine shown in FIG. 1 was equipped. It is a figure which shows the fluctuation | variation of the rotational speed of the motor with which the washing machine shown in FIG. 1 was equipped. It is a flowchart in the spin-drying | dehydration process of the washing machine shown in FIG. It is a block diagram of the washing machine which is the 2nd Embodiment of this invention. It is a figure which shows the beat signal of the rotational speed of the motor with which the washing machine shown in FIG. 6 was equipped. It is a flowchart in the spin-drying | dehydration process of the washing machine shown in FIG.

Explanation of symbols

10 Washing machine 20 Spin basket (rotating body)
31 Rotational speed sensor (Rotational speed measuring means)
32 Speed sensor (detection means)
33 Analysis means 34 Motor rotation control section (control means)
40 First balancing device (balancing means)
41, 51 Race 42, 52 Ball (rolling element)

Claims (5)

In a rotating body control device that controls the rotating operation of a rotating body that is rotatably mounted around a rotating shaft
An annular race integrally formed with the rotating body and concentrically with the rotating shaft of the rotating body, and a rolling element housed in the race so as to be movable following the rotation of the rotating body. And at least two or more balancing means having
A rotational speed measuring means for measuring the rotational speed of the rotating body;
Detecting means for detecting the rotational speed of the rotating body;
Analyzing means for analyzing the fluctuation state of the rotational speed detected by the detecting means and calculating an unbalanced weight generated in the rotating body;
Based on the calculation result of the unbalance weight by the analysis means, control means for controlling the rotation operation of the rotating body;
With
The analyzing means is configured so that the rotational speed of the rotating body is lower than the rotational speed at the start of movement of the rolling elements accommodated in all balancing means, or for all balancing means except for one balancing means. The rotating body control device characterized by analyzing the fluctuation state of the rotational speed when the rotational speed is lower than the rotational speed at the start of movement of each of the rolling elements housed therein.   With respect to the balancing means provided at least two or more, the number of rotations of the rotating body at the start of movement of each of the rolling elements accommodated in one balancing means is determined by each of the balancing means accommodated in the other balancing means. The rotating body control device according to claim 1, wherein the rotating body control apparatus is set to be lower than the number of rotations of the rotating body when the rolling body starts to move. The analysis means includes
Based on the fluctuation state of the rotational speed detected by the detection means, after calculating the unbalance weight generated in the rotating body, compare the unbalance weight and the total weight of each rolling element,
The control means includes
3. The control according to claim 1, wherein when the unbalanced weight becomes larger than a total weight of each of the rolling elements by a predetermined amount, the rotational speed of the rotating body is controlled to be temporarily reduced. The rotating body control device described. The rotating body control device according to claim 1 or 2,
The washing machine according to claim 1, wherein the rotating body is a spin basket that has an internal space for storing laundry and is rotatably mounted around the rotating shaft. The analysis means includes
Based on the fluctuation state of the rotation speed detected by the detection means, after calculating the unbalance weight generated in the spin basket, comparing the unbalance weight and the total weight of each rolling element,
The control means includes
The washing machine according to claim 4, wherein when the unbalanced weight becomes larger than a total weight of the rolling elements by a predetermined amount, the rotation speed of the spin basket is controlled to be temporarily reduced. .

Images