JPH0329695A - Rotation stop control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention is directed to rotating a rotating body such as a drum so that it is stopped with a predetermined part of its outer circumference corresponding to a stationary fixed part. The present invention relates to a rotation stop control device that performs stop+L control.

(Prior art) In a so-called top-loading type drum washer or drum dryer, when the rotation of the drum is stopped at the end of operation, etc., the drum body, which is a predetermined part on the outer periphery of the rotating body It is necessary to make the opening provided in the section correspond to the entrance/exit for clothes, etc. provided on the upper surface of the main body, which is the stationary and fixed part. An example of such a configuration is shown in FIG. In FIG. 4, 1 is a rotating body such as a drum, and 2 is a motor that rotates the rotating body 1 in the direction of arrow A via a belt 3.

Reference numeral 4 denotes a magnet provided at a predetermined location on the outer periphery of the rotating body 1. Reference numeral 5 denotes a first detection means, which is a reed switch and is provided at the first stationary and fixed portion, and outputs a detection signal when the magnet 4 corresponds to the first stationary and fixed portion. Reference numeral 6 denotes a second detection means consisting of a reed switch and provided at the second stationary fixed part, which is connected to the magnet 4.
A detection signal is output when corresponds to the second stationary fixed region. 7 is a control circuit, which is connected to the first and second detection means 5.
and 6, and controls the motor 2 to be turned on and off.

In the above configuration, when the rotating body stop signal is given, when the rotating body 1 rotates and the first detection means 5 detects the magnet 4, the motor 2 is electromagnetically braked to almost temporarily stop the rotating body 1. . Thereafter, the rotating body 1 is rotated at a slow rotational speed, and when the second detection means 6 detects the magnet 4, the motor 2 is electromagnetically braked to stop the rotating body 1.

(Problem to be Solved by the Invention) However, in the above conventional configuration, the detection stages 5 and 6 are
Since they are provided separately, there is a drawback that the cost is high. Furthermore, when the rotating body stop signal is given, the rotating body 1 is always placed at the same position, that is, the magnet 4 is at the position corresponding to the first detection means 5, and a fairly strong braking is applied to the rotating body 1. There was a problem in that a strong biased force was always applied to the shaft support device or the drive belt, resulting in poor durability over time.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a rotation stop control device that can reduce the number of detection means, lower costs, and improve durability.

[Structure of the Invention] (Means for Solving the Problems) A rotation stop control device of the present invention rotates a rotating body in one direction, and when a rotating body stop signal is given, the rotating body is rotated at its outer peripheral portion. A device that performs rotation stop control so that a predetermined part is stopped in a state corresponding to a stationary and fixed part, comprising a predetermined part identifier provided at a predetermined part on the outer periphery of the rotating body; A plurality of identifiers provided at a distance from a predetermined part in a direction opposite to the rotational direction are provided, and the predetermined part identifier and the plurality of identifiers provided at the stationary fixed part correspond to the stationary fixed part. comprising an identifier detection means for outputting a detection signal when the rotational body is rotated, and a rotation speed calculation means for calculating the rotation speed of the rotating body based on the detection signal from the detection means,
Co-rotation position detection means detects the rotational position of the rotary body based on a detection signal from the detection means, and when the rotation body stop No. 1 is given, the rotation speed and the rotation from the rotation speed calculation means are provided. The present invention is characterized in that it includes a braking means for stopping the rotating body by applying a braking force according to the rotational position from the position detecting means.

(Operation) According to the above means, since only one identifier detection means is provided, the number of detection means can be reduced compared to the conventional method.

In addition, since the rotational speed and rotational position of the rotating body are calculated based on the detection signal output when the predetermined part identifier and a plurality of identifiers correspond to a stationary and fixed part, when the rotating body is stopped, the rotating body is stopped. After the signal is applied, a braking force corresponding to the rotational speed and rotational position is applied to the rotating body. In this case, since the timing at which the rotary body stop signal is given is random, the braking force and braking start position for the rotary body become random each time rotation stop control is performed. Therefore, force acts on the rotating body evenly, improving durability over time.

(Example) Hereinafter, an example in which the present invention is applied to, for example, a drum dryer will be described with reference to FIGS. 1 to 3.

First, in FIG. 1, a rotating body 11 is a drum for storing and drying clothes and the like. This rotating body 11 is rotationally driven in one direction, for example, in the direction of arrow B, by a motor 13 via a belt 12. For example, a first magnet 1, which is a predetermined region identifier, is attached to a predetermined portion of the outer circumferential portion of the rotating body 11.
4 is provided. On the outer circumference of the rotating body 11, for example, a second magnet 15, which is an identifier, is placed at an angle α in the direction opposite to the arrow B from the first magnet 14.
is provided, and from this ¥42 magnet 15 anti-arrow B
For example, a third magnet 16, which is an identifier, is provided at an interval of an angle 2α in the direction, and from this third magnet 16, a fourth magnet 17, which is an identifier, is provided at an interval of an angle 3α in the direction opposite to the arrow B. A magnet 18 having an identifier, for example tJi5, is provided at an angle 4α in the direction opposite to the arrow B from the fourth magnet 17. Thereby, the distance between the plurality of magnets 15 to 18 becomes wider in the direction opposite to the rotation direction from the first magnet l4.

On the other hand, a reed switch 19, which is an identifier detection means, is provided at a stationary and fixed portion of the main body or the like. This reed switch 19 is configured to output a detection signal, for example, an on signal, when the first magnet l4 and the second to jfT5 magnets 15 to 18 correspond to a stationary fixed position.

Note that when the first magnet 14 corresponds to one reed switch, the opening provided in the body of the rotating body 11, that is, the drum, and the opening for clothing provided in the upper surface of the main body are aligned. (none of these are shown). 2
0 is a magnet passage time measuring circuit, which receives an ON signal from one reed switch and measures the passage time between each magnet. Reference numeral 21 denotes a rotation speed calculation circuit, which receives the passage time between each magnet from the magnet passage time measuring circuit 20 and calculates the rotation speed of the rotating body 11 from the passage time and the angle between the magnets.

These magnet passage time clock circuit 20 and rotation speed calculation circuit 21 constitute a rotation speed calculation means 22, and this rotation speed calculation means 22 calculates the rotation speed of the rotating body 11 based on an ON signal from one reed switch. calculate. 23 is a rotational position calculation circuit, which is the reed switch 1
At the same time, the number of the previously detected magnet is read out from the magnet number storage circuit 24, the number of the magnet detected this time is calculated, and the number of the magnet detected this time is calculated.
1 is detected, and the number of the magnet is stored in the magnet number storage circuit 24. These rotational position calculation circuit 23 and magnet number storage circuit 24 constitute a rotational position detection means 25, and this rotational position detection means 25 detects the rotational position of the rotating body 11 based on the ON signal from the reed switch 19. do. 26 is a braking means, for example, a rotational speed control circuit, which applies a braking force to the rotating body 11 according to the rotational speed from the rotational speed calculation circuit 21 and the rotational position from the rotational position calculation circuit 23 to control the rotational body 1.
Stop 1. The braking force applied to the rotating body 11 is, for example, electromagnetically braking the motor 13 by applying a half-wave current to the motor 13, and the braking force can be increased by appropriately adjusting the electromagnetic braking time, which is the half-wave energizing time. It is designed to be adjusted. In addition, the above-mentioned magnet passage time measuring circuit 201, rotational speed calculation circuit 21, and rotational position calculation circuit 23
, magnet number storage circuit 24, rotation speed control circuit 26
etc., are configured to include, for example, a microcomputer.

Next, the operation of the above configuration will be explained with reference also to FIGS. 2 and 3.

FIG. 2 shows the contents of the part of the control program stored in the microcomputer that stops the rotation of the rotating body 11, that is, the magnet passage time clock circuit 20, the rotational speed calculation circuit 21, the rotational position calculation circuit 23, and the magnet number storage circuit. 24, each function of the rotational speed control circuit 2 and 6 is shown.

First, when the rotating body 11 is normally rotating during drying operation, the rotational speed of the rotating body 11 is calculated, and
The rotational position of the rotating body 11 is detected. Specifically, when the rotation stop signal is not given (r in step S1),
Proceed to NOJ), and each time one reed switch detects magnets 14 to 18 (proceed to "YES" in step S2), the time taken to pass between each of magnets 14 to 18 is increased to 21 hours (step S3). . In this case, since the rotating body 11 rotates in the direction of arrow B, the passing time between the magnets 14 and 18 is t1, the passing time between the magnets 18 and 17 is t2, and the passing time between the magnets 17 and 16 is t1. The passing time between is t3, magnet 1
If the passing time between the magnet 6 and the magnet 15 is t4, and the passing time between the magnet 15 and the magnet 14 is t5, then tl>t2>t3>t4>t5. Therefore,
By comparing the previously detected passing time with the currently detected passing time, it can be determined which of the magnets 14 to 18 the magnet currently detected by the reed switch 19 is.

Here, the first magnet 14 is magnet number 1, the second magnet 15 is magnet number 2, the third magnet 16 is magnet number 3, the fourth magnet 17 is magnet number 4, and the fifth magnet 18 is magnet number 2. Assuming number 5, if the currently detected transit time is longer than the previously detected transit time (rN in step s4)
Since the fifth magnet 18 has been detected, the magnet number is corrected to 5 (step S
5). In addition, if the currently detected passing time is shorter than the previously detected passing time (rYES in step S4),
Proceed to step J), enter the magnet number once (step S
6), the magnet corresponding to that magnet number has been detected.

Thereby, the rotational position of the rotating body 11 is detected.

Then, the angle of the magnet interval is specified by the magnet number, and from this angle and the passage time, the rotating body 1
1 rotation speed is calculated (step S7).

Now, when the drying operation is finished or when the drying operation is temporarily stopped, a rotation stop signal is given (proceeds to rYESJ in step S1), and at this given point, the motor 13
The rotating body 11 is braked by electromagnetically braking (step S8). In this case, since the rotational speed and rotational position of the rotating body 11 at the time when the rotation stop signal is given are known, a braking force is applied according to the rotational speed and rotational position.

This braking force is adjusted by the electromagnetic braking time of the motor 13. Specifically, as shown in FIG. 3, the electromagnetic braking time T is set so that the closer the magnet number, which is the rotational position, is to 1, the longer the electromagnetic braking time T becomes, and the faster the rotational speed becomes, the longer the electromagnetic braking time T becomes. Furthermore, the electromagnetic braking time T is appropriately set in advance, taking into consideration the electromagnetic braking performance and rotational inertia of the product. In this FIG. 3, the rotational speed V is Vl<V2<V
3<V4, electromagnetic braking time T is Tl<T2<...<T
It is 9. Now, for example, the fifth magnet 1 of the rotating body 11
8 and the fourth magnet 17 is the reed switch 19
When a rotation stop signal is given while corresponding to
The rotational speed of the rotating body 1 is slowed down by a braking force corresponding to the rotational speed and rotational position of the rotating body 11 at points n and r. After this, when the fourth magnet 17 is detected by the reed switch 19 (proceeds to rYESJ in step S9 and proceeds to "No" in step 510), the magnet passing time (the fifth magnet 18 and the fourth (with respect to the magnet 17) is measured (step S11).

Subsequently, the magnet number is decremented by 1 (Stennob S12
), and the rotational speed is calculated (step S13).

Then, the rotating body 11 is braked by a braking force corresponding to the rotational speed and the rotational position, so that the rotational speed of the rotating body 11 becomes slower than before. After this, each time the third magnet 16 and the second magnet 15 are detected by one reed switch, the above-mentioned process is repeated and the rotational speed of the rotating body 11 is sequentially slowed down and electromagnetic braking is applied to immediately stop the rotating body 11. Set the rotation speed to the desired speed. Then, when the first magnet 14 is detected by one reed switch (proceeds to rYESJ in step S10), electromagnetic braking is performed to stop the rotating body 11 (step S14).

Here, since the timing at which the rotation stop signal is given is random with respect to the rotation of the rotating body 11, the braking start position of the rotating body 11 is random.

On the other hand, if braking is started between the fifth magnet 18 and the fourth magnet 17 as described above, the rotational speed will be reduced to four levels before stopping, and for example, the rotation speed will be reduced to four levels before stopping. When braking with the second magnet 15 is started, the rotation speed is reduced to two stages and then stopped. In this way, the braking start position of the rotating body 11 is random, the number of stages at which the rotational speed is reduced is random, and the strength of the braking force applied and the number of braking times are also random. Even when braking is performed randomly in this way, the rotating body 11 has a predetermined portion (the first magnet 14) stationary and a fixed portion (one reed switch).
stop in response to.

According to this embodiment having such a configuration, only one reed switch 19 is provided as the detection means, so that it is different from the conventional method (
(see FIG. 4), the number of detection means can be reduced. Furthermore, when stopping the rotating body 11, since the timing at which the rotating body stop signal is given is random, the braking force, braking frequency, braking start position, etc. for the rotating body 11 are randomly determined every time rotation stop control is performed. Become. For this reason,
Force acts on the rotating body 11 evenly, and its durability over time is improved compared to the prior art.

In the above embodiment, the reed switch 19 is used as the identifier detection means, but a Hall element may be used instead. Further, although the magnets 14 to 18 are used as the identifiers, a light reflecting portion may be formed by painting or the like, and the light reflecting portion may be detected by a reflective light emitting/receiving sensor as the identifier detecting means. In the above, four magnets 15 to 18 were provided as a plurality of identifiers, but the present invention is not limited to this, and 2.3 or 5 or more magnets may be provided.

[Effects of the Invention] As is clear from the above description, the present invention includes a predetermined part identifier provided at a predetermined part on the outer periphery of the rotating body, and also includes a predetermined part identifier provided on the outer periphery of the rotating body from the predetermined part in the opposite direction of rotation. It is equipped with a plurality of identifiers provided so that the intervals become wider in the direction, and when a rotating body stop signal is given,
Since the rotating body is configured to be stopped by applying a braking force according to the rotational speed and rotational position of the rotating body, the number of detection means can be reduced, which reduces costs and has the excellent effect of improving durability. play.

2 is a schematic side view showing the electrical structure, FIG. 2 is a flow chart, and FIG. 3 is a table showing the relationship between rotational speed, rotational position, and electromagnetic braking time.

Moreover, FIG. 4 is a diagram corresponding to FIG. 1 showing a conventional configuration.

In the drawing, 11 is a rotating body, 14 is a first magnet (predetermined part identifier), and 15 to 18 are second to fifth magnets (
1 is a reed switch (identifier detection means), 22 is a rotational speed calculation means, 25 is a rotational position detection means, and 26 is a rotational speed control circuit (braking means).

Claims (1)

[Claims] 1. A device that rotates a rotating body in one direction, and when a rotating body stop signal is given, performs rotation stop control such that the rotating body is stopped with a predetermined part of the outer circumference corresponding to a stationary fixed part. , a predetermined part identifier provided at a predetermined part on the outer periphery of the rotary body, and a predetermined part identifier provided on the outer periphery of the rotor so that the interval becomes gradually wider from the predetermined part in a direction opposite to the rotation direction. multiple identifiers and
an identifier detection means provided at the stationary fixed part and outputs a detection signal when the predetermined part identifier and a plurality of identifiers correspond to the stationary fixed part; and a rotational speed of the rotating body based on the detection signal from the detection means. a rotational speed calculation means for calculating the rotational speed, a rotational position detection means for detecting the rotational position of the rotating body based on a detection signal from the detection means, and a rotational position detection means for detecting the rotational position of the rotating body based on the detection signal from the rotational speed calculation means A rotation stop control device comprising: a braking means for stopping the rotating body by applying a braking force according to the speed and the rotational position from the rotational position detection means.