JPH07323193A - Motor vibration decreasing device and clothes drying machine having this device - Google Patents

Abstract

PURPOSE:To simplify the constitution of a device by forming the same frequency signal as the electromagnetic vibration component desired to be negated in synchronization with a commercial power source, correcting this signal in accordance with the electromagnetic vibration component desired to be negated and applying this signal to a negation vibration generating means, thereby generating the prescribed negation vibrations. CONSTITUTION:The electromagnetic vibrations proportional to the frequency of the commercial power source 30 are generated in a rotating direction in a motor 3. The vibrations are detected via a holder 5 by a vibration detecting sensor 21 and are inputted to an arithmetic section 37 of an excitation control section 22. This arithmetic section 37 extracts the prescribed frequency, i.e., the frequency component g of the electromagnetic vibrations generated in the motor from the sinusoidal signal corresponding to the combined vibration component. A subtraction circuit 36, then, calculates the sinusoidal signal corresponding to the amplitude difference from the phase inversion sinusoidal signal e formed by an inversion phase circuit 35 and outputs this signal to a driving circuit 38. This driving circuit 38 applies the sinusoidal signal h corresponding to this amplitude difference to an excitation device 20 which excites the holder 5 in the vibration negation direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration reducing device for a motor driven by a commercial power source, and a clothes dryer equipped with the vibration reducing device.

[0002]

2. Description of the Related Art Conventionally, there has been known a clothes dryer which supplies heated air to a rotating drum containing clothes and rotates the rotating drum to dry clothes. Such a clothes dryer is generally equipped with an AC motor driven by a commercial power source, and the rotating drum is rotated by the motor.

In such a clothes dryer, there has been a problem that the driving noise is relatively louder than before. The present inventor examined this driving sound and found that
It was found that the sound around 0 (Hz) to 120 (Hz) was annoying. Further, the sound of 100 (Hz) to 120 (Hz) is electromagnetic vibration derived from the motor. For example, if the frequency of the commercial power source is 60 (Hz), the motor is 120 times twice the frequency of the commercial power source. It was discovered that electromagnetic vibration of (Hz) was occurring.

[0004]

The electromagnetic vibration generated in the motor is transmitted to the main body housing and the rotary drum in the clothes dryer, and the main body housing and the rotary drum resonate with the electromagnetic vibration to cause the above-mentioned annoying operation sound. Occurs. In order to fundamentally eliminate such driving noise, a method of reducing electromagnetic vibration of the motor that is the sound source can be considered. To do this, for example, redesign the motor, etc.
Alternatively, a motor with less vibration may be made. However, completely eliminating electromagnetic vibration from the motor is difficult and almost impossible in design.

Therefore, there is a demand for a device which has a simple structure and reduces electromagnetic vibration generated by a motor. The present invention has been made under such a background, and an object thereof is to provide a device capable of reducing electromagnetic vibration of a motor with a simple configuration. Another object of the present invention is to provide a clothes dryer in which the above-mentioned motor vibration reducing device is incorporated and which produces a quiet operating noise.

[0006]

According to a first aspect of the present invention, there is provided a motor vibration reducing device for reducing electromagnetic vibration generated when a motor driven by a commercial power source is driven. A creating means for creating a signal of a predetermined frequency synchronized with a commercial power source applied to the motor; a detecting means for detecting an electromagnetic vibration component of a predetermined frequency among vibrations generated in the motor; Correction means for correcting the signal of the predetermined frequency based on the electromagnetic vibration component detected by the detection means,
And a canceling vibration generating means for giving the frequency signal corrected by the correcting means and generating a canceling vibration proportional to the frequency signal to the motor.

A motor vibration reducing device according to a second aspect is the motor vibration reducing device according to the first aspect, wherein the detecting means detects the amplitude of the electromagnetic vibration component and the correcting means detects the amplitude. It is characterized in that the gain of the frequency signal created based on the amplitude is adjusted. The motor vibration reducing device according to claim 3 is the motor vibration reducing device according to claim 1 or 2.
A vibration reduction device for a motor according to claim 1, wherein the motor is
Mainly attached to a holder having a shape capable of vibrating only in a predetermined unidirectional direction, and the canceling vibration generating means is
The generated counteracting vibration is applied to the holder.

A motor vibration reducing device according to a fourth aspect is the motor vibration reducing device according to the third aspect, wherein the holder has a pedestal on which the motor is mounted and a motor rotation shaft of the pedestal. And a pair of plate-shaped leg portions extending downward from both right and left sides parallel to the. Further, the clothes dryer according to claim 5 is provided with a housing, a rotating drum rotatably arranged in the housing to accommodate clothes to be dried, and provided in the housing, and is driven by a commercial power source. A motor for driving the rotating drum, and the vibration reducing device according to any one of claims 1 to 4 for the motor.

[0009]

According to the first aspect of the present invention, a signal having the same frequency as the electromagnetic vibration component to be canceled synchronized with the commercial power source is created, and the created signal is corrected based on the electromagnetic vibration component to be canceled. The correction is performed such that a gain corresponding to the amplitude of the generated electromagnetic vibration component is obtained, for example, as in the second aspect of the invention. Then, the corrected frequency signal is applied to the canceling vibration generating means, and the canceling vibration generating means generates canceling vibration proportional to the corrected frequency signal. Since this canceling vibration is applied to the motor, when vibration occurs in the motor, vibration that cancels the generated vibration is applied to the motor, and as a result, the motor does not vibrate.

In the inventions according to claims 3 and 4, the motor is attached to the holder such that its vibration is mainly a simple vibration, and the canceling vibration is applied to the holder. Therefore, the electromagnetic vibration generated in the motor can be generated as a simple vibration that can be easily canceled, and by canceling the simple vibration, the motor can be brought into a state in which almost no vibration occurs as a result.

According to the fifth aspect of the present invention, since the vibration reducing device according to any of the first to fourth aspects is provided, it is possible to provide a clothes dryer with a quiet driving sound.

[0012]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view showing an overall outline of a clothes dryer according to a first embodiment of the present invention, the internal structure of which is transparent, and only a portion related to the present invention is schematically shown. This clothes dryer includes a housing 1 having a substantially rectangular parallelepiped appearance. A rotary drum 2 for containing clothes to be dried is rotatably arranged in the housing 1. A door (not shown) is arranged in the housing 1, and by opening the door, clothes can be taken in and out of the rotary drum 2.

A motor 3 is also provided in the housing 1. The motor 3 rotates the rotary drum 2 and also drives a fan 4 for circulating air in the rotary drum 2. The motor 3 is attached to the holder 6 via a motor mount 5 arranged in the housing 1. A vibration reduction device 7 described later is attached to the holder 6.

The rotating shaft 8 of the motor 3 projects in front of and behind the motor 3. A drum pulley 9 is attached to the rotating shaft 8 projecting forward. A drum belt 10 is stretched between the rotating drum 2 and the drum pulley 9. The tension of the drum belt 10 is caused by the idler pulley 11a pressed against the drum belt 10 and the idler pulley 11a.
Is adjusted by a tension adjusting mechanism 11 including an elastic arm 11b for rotatably holding. On the other hand, a fan pulley 12 is attached to the rotary shaft 8 protruding rearward from the motor 3, and a fan belt 13 is stretched between the fan pulley 12 and the fan 4.

FIG. 2 is an illustrative view showing a motor mounting structure for explaining the configuration of the vibration reducing device 7. The vibration reduction device 7 includes the vibration device 20, the vibration detection sensor 21, and the vibration device 20 based on the outputs of the vibration detection sensor 21.
A vibration control unit 22 that applies a sine wave current to drive the motor is included. The vibrating device 20 functions as a canceling vibration generating means for applying to the holder 6 a vibration for canceling an electromagnetic vibration originating from the motor 3 described later, and the peripheral surface of the movable iron core 23. The coil 24 is wound around the coil. The vibrating device 20 includes the iron core 2
The holder 3 is attached to the holder 6 so that the holder 6 can be vibrated in the X direction by moving the holder 3. The vibration detection sensor 21 is composed of, for example, an acceleration sensor, and is attached at a position facing the vibrating device 20.

When a sine wave current is applied from the vibration control unit 22 to the vibration device 20, the magnetic field generated in the coil 24 changes periodically, and the iron core 23 moves periodically in the X direction. As a result, the X which is synchronized with the sine wave current is applied to the holder 6.
Directional vibration is applied. On the other hand, electromagnetic vibration originating from the motor 3 described later is transmitted to the holder 6. As a result, the holder 6 vibrates in accordance with a combined vibration component of the vibration component applied from the vibrating device 20 and the electromagnetic vibration component derived from the motor 3. The vibration detecting sensor 21 detects the combined vibration component.

FIG. 3 is a block diagram showing the electrical construction of the portion of the clothes dryer related to the present invention, and FIG. 4 is a waveform diagram showing the waveform of each portion. The motor 3 has a sine wave current (see FIG.
It is driven by the motor drive circuit 31 to which (a) is supplied. In the motor 3, electromagnetic vibration proportional to the power supply frequency 60 (Hz) is generated in the rotation direction of the motor 3. In particular,
Electromagnetic vibration of 120 (Hz), which is twice the power frequency of 60 (Hz), is generated (Fig. 4 (f)). The generated electromagnetic vibration is transmitted to the holder 6 via the motor mount 5. As a result, the holder 6 vibrates in synchronization with the electromagnetic vibration of 120 (Hz).

The vibration control unit 22 includes a full-wave rectifier circuit 3
2 is included. In the full-wave rectifier circuit 32, the commercial power source 3
The sinusoidal current of frequency 60 (Hz) supplied from 0 is full-wave rectified. The full-wave rectified sine wave signal (solid line in FIG. 4B) is supplied to the zero-cross detection circuit 33. The output of the zero-cross detection circuit 33 (solid line in Fig. 4 (c)) is 120 (Hz)
It is given to the sine wave generation circuit 34. In the 120 (Hz) sine wave generation circuit 34, based on the output of the zero cross detection circuit 33, a 120 (Hz) sine wave signal (solid line in FIG. 4 (d))
Is generated.

That is, the 120 (Hz) sine wave generating circuit 34 generates a sine wave signal having the same frequency as the electromagnetic vibration (FIG. 4 (f)) originating from the motor 3. 120 generated
The sine wave signal of (Hz) is converted into a sine wave signal (FIG. 4 (e)) whose phase is inverted by the phase inverting circuit 35, and then applied to the subtracting circuit 36. On the other hand, the sine wave signal corresponding to the combined vibration component of the holder 6 output from the vibration detection sensor 21 is given to the arithmetic circuit 37. The sine wave signal corresponding to the synthetic vibration component extracted by the arithmetic circuit 37 is shown in FIG.
4g corresponds to the amplitude difference between the sine wave signal whose phase is inverted and the electromagnetic vibration originating from the motor 3 in FIG. 4f.
The waveform is as shown in. The waveform shown in FIG. 4 (g) is obtained when the gain of the electromagnetic vibration derived from the motor 3 is larger than the gain of the sine wave signal whose phase is inverted.
The waveform corresponding to the synthetic vibration component in the opposite case is the phase of the waveform in FIG. 4 (g) inverted.

In the arithmetic circuit 37, a 120 (Hz) component is extracted from the sine wave signal corresponding to the composite vibration component.
The extracted 120 (Hz) component is given to the subtraction circuit 36. In the subtraction circuit 36, the phase-inverted 120
(Hz) sine wave signal (Fig. 4 (e)) and the extracted synthetic vibration component 120 (Hz) component (Fig. 4 (g)) corresponding to the amplitude difference (Fig. 4 (h) )) Is obtained. The sinusoidal signal corresponding to the obtained amplitude difference is given to the drive circuit 38 for driving the vibration device 20. In the drive circuit 38, a sine wave signal corresponding to the given amplitude difference is given to the vibration device 20.

In this embodiment, the full-wave rectification circuit 32,
Zero cross detection circuit 33, 120 (Hz) sine wave generation circuit 3
4 and the phase inversion circuit 35 function as a creation means.
Further, the vibration detection sensor 21 and the arithmetic circuit 37 function as detection means and the like. Further, the subtraction circuit 36 functions as a correction unit or the like. FIG. 5 is a flowchart for explaining the vibration reducing process in the vibration reducing device 7.

When the power of the clothes dryer is turned on and the drying operation is started, the vibration device 20 has the phase reversed.
A sinusoidal current of 20 (Hz) is applied. In the vibration device 20, the holder 6 is vibrated in synchronization with the given sinusoidal current. On the other hand, when the motor 3 is driven, 120 (Hz) electromagnetic vibrations derived from the motor 3 are transmitted to the holder 6. As a result, the holder 6 vibrates due to the combined vibration component of the vibration component applied from the vibrating device 20 and the electromagnetic vibration component derived from the motor 3 (step S).
1). The combined vibration component is the vibration detection sensor 21.
Is detected (step S2).

Here, when the combined vibration component is not zero, the vibration component applied from the vibrating device 20 is either too large or too small. Therefore, the vibration of the holder 6 is eliminated as it is. It is not possible. Therefore, when the combined vibration component is not zero, the gain of the sine wave current to be given to the vibration device 20 is adjusted so as to cancel the combined vibration component (step S3). Specifically, the subtraction circuit 36 obtains the amplitude difference between the 120 (Hz) phase-inverted sine wave signal and the composite vibration component, and the obtained amplitude difference is provided to the vibration exciter 20.

In the vibration device 20 to which the gain-adjusted sine wave current is applied, vibration synchronized with the gain-adjusted sine wave current is applied to the holder 6. That is, vibration that eliminates the combined vibration component detected in step S2 is applied to the holder 6. Therefore, by repeating the above operation, the above-mentioned combined vibration component can be made zero.

When the combined vibration component is zero, it can be determined that the vibration component applied from the vibrating device 20 and the electromagnetic vibration component originating from the motor 3 are almost canceling each other. (Step S4), the sine wave current applied to the vibration device 20 at this time is continuously applied until the drying operation ends thereafter. As described above, according to the clothes dryer of the present embodiment, even if the holder 6 is vibrating in synchronization with the electromagnetic vibration derived from the motor 3, the vibrating device 20 generates a vibration that cancels the vibration. 6, the electromagnetic vibration derived from the motor 3 can be reduced. Moreover, the vibration that cancels the above-mentioned vibration is generated by simply adjusting the gain of the sine wave current supplied from the commercial power supply 30. Therefore,
It is possible to reduce electromagnetic vibration originating from the motor 3 with a simple configuration. Therefore, it is possible to realize a clothes dryer with a quiet driving sound.

In the above embodiment, the vibration detecting sensor 2
Although the gain of the sine wave current to be supplied to the vibration exciter 20 is adjusted by the output of 1, the gain may be appropriately adjusted in the drive circuit 38, for example. According to this configuration, the vibration detection sensor 21 is not necessary, so the configuration becomes simpler. Further, in the above embodiment, the case where the vibration device 20 that can apply vibration in the X direction is used has been described. However, for example, in addition to the vibration device 20 that can apply vibration in the X direction, A vibrating device that can apply vibration in a vertical direction (hereinafter referred to as “Y direction”) may be attached to the holder 6. According to this configuration, it is possible to reduce not only the X-direction vibration but also the Y-direction vibration of the electromagnetic vibrations mainly derived from the motor 3 including the X-direction component and the Y-direction component. Therefore, as a whole, the electromagnetic vibration derived from the motor 3 can be significantly reduced.

Next, a clothes dryer according to a second embodiment of the present invention will be described. In the description of this second embodiment, the first
The same reference numerals are used for the same functional parts as the respective parts described in the embodiment. In order to significantly reduce the electromagnetic vibration mainly derived from the motor 3 including the X-direction component and the Y-direction component,
Normally, it is necessary to apply a canceling vibration in the X and Y directions. However, it is desirable to reduce the electromagnetic vibration with a simpler configuration.

Therefore, in this embodiment, by using the saddle type holder shown below, only the unidirectional component is extracted from the electromagnetic vibration. That is, the feature of this embodiment is that
The use of a saddle-type holder is to make unidirectional component vibration that is easy to cancel electromagnetic vibration. FIG. 6 is a perspective view showing the structure of a saddle type holder used in the clothes dryer of the second embodiment of the present invention. The saddle-type holder 40 is the holder 6 described above.
A pedestal 41 on which (see FIG. 1) should be placed, and this pedestal 4
It includes a pair of plate-shaped leg portions 42a and 42b extending downward from both right and left sides parallel to the rotation axis 8 of the first motor, and promotes vibration in the X direction and converts vibration in the Y direction into vibration in the X direction. It has the function of converting.

FIG. 7 is an illustrative view showing a mounting structure of the motor 3 using the saddle type holder 40. The saddle type holder 4
0 is interposed between the holder 6 and the bottom surface of the housing 1, and is fixed to the holder 6 and the housing 1 by predetermined fixing means (not shown) such as screws.
A vibration reduction device 43 described later is attached to the saddle type holder 40. As described above, the saddle type holder 40 has a function of converting each vibration in the X direction and the Y direction into an acceleration and a vibration in the X direction. Therefore, the saddle type holder 40 is derived from the motor 3 transmitted through the holder 6. Only the X-direction vibration is extracted from the generated electromagnetic vibrations. As described in the first embodiment, this vibration is 12 times twice the power frequency 60 (Hz).
The vibration is synchronized with the 0 (Hz) sine wave signal.

FIG. 8A is a sectional view for explaining a specific structure of the vibration reducing device 43. Vibration reducer 4
As shown in FIG. 8A, reference numeral 3 denotes a vibration device 50, a vibration detection sensor 51, and a vibration control unit for applying a sine wave current to drive the vibration device 50 based on the output of the vibration selection sensor 51. 52 is included. The vibrating device 5
0 is an iron core 55 supported by two leg portions 53 and 54 and fixed so as to penetrate one plate leg portion 42b of the saddle type holder 40, and the inner and outer circumferences of the saddle type holder 40 of the iron core 55. It includes two coils 56 and 57 respectively wound on the surface. The vibration detection sensor 51 includes a permanent magnet 58.
And a coil 59 wound around the peripheral surface of the permanent magnet 58. One end of the permanent magnet 58 has a saddle type holder 40.
Is fixed to the other plate-shaped leg portion 42a.

The vibrating device 50 and the vibration detecting sensor 51 may have the structure as described in the first embodiment, for example. When a sine wave current is applied to the vibration device 50 from the vibration control unit 22, the magnetic fields generated in the coils 56 and 57 change in response to this. As a result, the iron core 55 periodically moves in the X direction, and the saddle type holder 4
The vibration in the X direction synchronized with the sine wave current is applied to 0. On the other hand, the saddle type holder 40 has an X derived from the motor 3.
Direction electromagnetic vibrations are transmitted. Therefore, the saddle type holder 4
0 vibrates only in the X direction corresponding to the combined vibration component of the vibration component applied by the vibrating device 50 and the electromagnetic vibration component derived from the motor 3. Along with this, the permanent magnet 58 also moves in the X direction, so that a sinusoidal current synchronized with the combined vibration component is applied to the coil 5 of the vibration detection sensor 51.
9 occurs.

The vibration reducing device 43 is not limited to the above-mentioned structure, and may have a structure as shown in FIG. 8B, for example. That is, as shown in FIG. 8B, the vibration reduction device 43 having this configuration is based on the vibration detection device 72 including the permanent magnet 70 a, the vibration detection sensor 72 including the permanent magnet 70 b, and the output of the vibration detection sensor 72. The vibration control device 73 includes a vibration control unit 73 that applies a sine wave current to drive the vibration device 50.

The vibrating device 71 is further provided with a saddle type holder 4
An iron core 74b fixed to the plate-shaped leg portion 42b so as to penetrate through the plate-shaped leg portion 42b of 0, and wound around the iron core 74b so as to surround the plate-shaped leg portion 42b. And a coil 75b. Further, the vibration detection sensor 72 further includes an iron core 74a fixed to the plate-shaped leg portion 42a so as to penetrate the plate-shaped leg portion 42a, and the iron core 74a.
and a coil 75a wound around the plate-shaped leg portion 42a so as to surround the plate-shaped leg portion 42a.

When a sine wave current is applied to the oscillating device 71 from the oscillating control section 73, an electric current will flow through the coil 75b placed in the magnetic field of the permanent magnet 70b. According to the law, an electromagnetic force that simply vibrates in the X direction is generated in the saddle type holder 40. That is, this electromagnetic force cancels the electromagnetic vibration originating in the motor 3. When the saddle-shaped holder 40 vibrates,
Since the coil 75a placed in the magnetic field of the permanent magnet 70b moves, a sine wave current flows through the coil 75a according to the so-called Fleming's right-hand rule. This sine wave current is given to the vibration control unit 73. The vibration control unit 73 controls the amplitude of the vibration for canceling the electromagnetic vibration derived from the motor 3 by the applied sine wave current.

FIG. 9 is a block diagram for explaining the electrical construction of the portion of the clothes dryer of this embodiment related to the present invention. The electrical configuration of this embodiment is almost the same as that of the first embodiment, except that the delay circuit 80 is interposed between the commercial power supply 30 and the full-wave rectifier circuit 32. . Therefore, only matters relating to the delay circuit 80 will be described below.

In the first embodiment described above, the electromagnetic vibration derived from the motor 3 is transmitted to the holder 6 with almost no delay from the generation. On the other hand, in this embodiment, the electromagnetic vibrations originating from the motor 3 are transmitted to the saddle type holder 40 with a delay of about half a period because the holder 6 is interposed therebetween. Therefore, the delay circuit 80 generates a sine wave signal obtained by delaying the sine wave current having a frequency of 60 (Hz) supplied from the commercial power source 30 by a half cycle.

FIG. 10 is a flow chart for explaining the vibration reducing process in the vibration reducing device 43.
When the power of the clothes dryer is turned on and the drying operation is started, the vibration control unit 52 delays the sine wave current supplied from the commercial power supply 30 by a half cycle and inverts the phase (step P1). Therefore, in the vibrating device 50, vibration in the X direction synchronized with the sine wave signal with the inverted phase is applied to the saddle holder 40. As a result, the saddle type holder 40 vibrates in the X direction due to the combined vibration component of the vibration component applied from the vibrating device 50 and the electromagnetic vibration component derived from the motor 3 (step P2). The combined vibration component is detected by the vibration detection sensor 51 (step P3).

In the vibration control unit 52, when the combined vibration component is not zero, the sine wave current to be given to the vibration device 50 so as to cancel the combined vibration component detected by the vibration detection sensor 51. Gain is adjusted (Step P
4). That is, the amplitude difference between the sine wave signal whose phase is inverted and the above-described combined vibration component is obtained, and the obtained amplitude difference is given to the vibration device 50.

When the above-described operation is repeated and the above-described combined vibration component becomes zero, the electromagnetic vibration component derived from the motor 3 and the vibration component applied from the vibrating device 50 cancel each other almost completely. Since it can be determined that there is (step P5), the sine wave current applied to the vibration exciter 50 at that time is continuously applied until the drying operation ends thereafter.

As described above, according to the clothes dryer of this embodiment, the electromagnetic vibration component originating from the motor 3 is applied to the saddle type holder 40.
Since it is a unidirectional (X direction) vibration component and a canceling vibration component is added in that direction, the electromagnetic vibration component can be greatly reduced with a simple configuration. Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above-mentioned embodiments, and various design changes are made within the scope described in the claims. It is possible.

[0041]

As described above, according to the vibration reducing device of the first or second aspect, even if electromagnetic vibration of the motor occurs,
Since vibration that cancels the electromagnetic vibration is generated, electromagnetic induction of the motor can be reduced. Moreover, since the vibration that cancels the electromagnetic vibration is generated based on the commercial power source, the circuit configuration can be simplified. Therefore, the electromagnetic vibration of the motor can be reduced with a simple configuration.

Further, according to the vibration reducing device of the third or fourth aspect, the electromagnetic vibration of the motor can be made into a unidirectional vibration that is easy to cancel, so that the electromagnetic vibration of the motor can be more effectively reduced. According to the clothes dryer of the fifth aspect, it is possible to realize a clothes dryer with a quiet driving sound.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of an entire clothes dryer according to a first embodiment of the present invention, in which an internal structure is transparent and only a portion related to the present invention is schematically illustrated. is there.

FIG. 2 is an illustrative view showing a motor mounting structure for explaining the configuration of a vibration reduction device that constitutes a part of the clothes dryer.

FIG. 3 is a block diagram for explaining an electrical configuration of a portion of the clothes dryer related to the present invention.

FIG. 4 is a waveform diagram showing a waveform of each part of the electrical configuration.

FIG. 5 is a flowchart for explaining a vibration reducing process in the vibration reducing device.

FIG. 6 is a perspective view showing a structure of a saddle type holder used in a clothes dryer according to a second embodiment of the present invention.

FIG. 7 is an illustrative view for explaining a motor mounting structure using the saddle type holder.

FIG. 8 is a cross-sectional view for explaining a specific configuration of the vibration reducing device according to the second embodiment.

FIG. 9 is a block diagram for explaining an electrical configuration of a portion of the clothes dryer of the second embodiment related to the present invention.

FIG. 10 is a flowchart for explaining a vibration reducing process in the vibration reducing apparatus according to the second embodiment.

[Explanation of symbols]

 1 Housing 2 Rotating Drum 3 Motor 7,43 Vibration Reduction Device 20,50 Vibration Device 21,51 Vibration Detection Sensor 22,52 Vibration Control Unit 30 Commercial Power Supply 32 Full Wave Rectifier Circuit 33 Zero Cross Detection Circuit 34 120 (Hz) Sine Wave generation circuit 35 Phase inversion circuit 36 Subtraction circuit 37 Calculation circuit 40 Saddle-type holder 41 Pedestal 42a, 42b Plate-like leg

Claims (5)

[Claims] 1. A device for reducing electromagnetic vibration generated when a motor driven by a commercial power source is driven, and creating means for generating a signal of a predetermined frequency synchronized with the commercial power source applied to the motor. A detection unit that detects an electromagnetic vibration component of a predetermined frequency among the vibrations generated in the motor, a signal of the predetermined frequency created by the creation unit,
Compensation means for compensating on the basis of the electromagnetic vibration component detected by the detection means, and a cancellation signal given to the motor by giving a cancellation signal in proportion to the frequency signal corrected by the correction signal. A vibration reducing device for a motor, comprising: a vibration generating unit. 2. The motor vibration reducing device according to claim 1, wherein the detecting means detects the amplitude of the electromagnetic vibration component, and the correcting means adjusts the gain of the frequency signal created based on the detected amplitude. It is characterized by that. 3. The motor vibration reducing device according to claim 1, wherein the motor is attached to a holder having a shape capable of vibrating mainly in a predetermined unidirectional direction, and the canceling vibration generating means includes: The generated counteracting vibration is applied to the holder. 4. The motor vibration reducing device according to claim 3, wherein the holder includes a pedestal on which the motor is mounted and a pair of plate-shaped members extending downward from both left and right sides of the pedestal parallel to a motor rotation axis. And a leg portion. 5. A housing, a rotary drum rotatably arranged in the housing for accommodating clothes to be dried, provided in the housing, and driven by a commercial power source to drive the rotary drum. A clothes dryer, comprising: a motor for operating the motor; and the vibration reducing device according to claim 1 for the motor.