WO2016122171A1 - Drum driving apparatus, drum washing machine having same, and method for operating same - Google Patents

Abstract

The present invention relates to a drum driving apparatus and a drum washing machine having same, the drum driving apparatus which enables driving force of various characteristics, which is required during washing and spin-drying in a drum washing machine, to be efficiently provided to a drum by means of a combination of a double-rotor/double-stator motor and a planetary gear device that plays the role of a transmission. A drum driving apparatus, according to the present invention, comprises: a double-rotor/double-stator motor which is mounted on the back of a tub and generates an outer rotor output and an inner rotor output that can be controlled independently; and a planetary gear device which receives an outer rotor output through a sun gear as a first input and then generates a reduced first output from a carrier, receives an inner rotor output through a ring gear as a second input and then generates a second output without reduction from the carrier, and applies the first and second outputs to a drum shaft connected to a drum.

Description

Drum drive device, drum washing machine having same and driving method

The present invention is a combination of a double rotor-double stator-type twin-power motor and planetary gear device, a drum drive device capable of providing the drum with high efficiency driving force of various characteristics required in the washing and dewatering stroke of the drum washing machine, provided therewith It relates to a drum washing machine and a driving method.

Conventional drum washing machine, as disclosed in Korean Patent Publication No. 10-1063528 (Patent Document 1), the drum is disposed rotatably inside the tub, the rear end of the tub and the rotating shaft is passed through the center of the back of the tub drum The motor includes a bearing housing fixed to the tub and rotatably supporting the rotating shaft, a stator fixed to the bearing housing, and a rotor disposed at a predetermined gap on an outer circumferential surface of the stator and connected to the rotating shaft. do.

The drum washing machine of Patent Document 1 uses a motor including a single rotor-single stator, and when a driving signal is applied to the stator, the rotor is rotated and the drum connected to the rotor and the rotating shaft is rotated to perform washing, rinsing, and dehydration strokes. To wash the laundry.

In addition, the motor driving method of a conventional drum washing machine is disclosed in Korean Patent Laid-Open Publication No. 10-2007-0066093 (Patent Document 2), when the drum washing machine is operated, it is determined whether the operation information of the drum washing machine is a normal mode or a high speed mode. In the general mode, the square wave motor driving information is read and the square wave driving method is applied to the motor of the drum washing machine. In the high speed mode, the sine wave motor driving information is read and the sine wave driving method is applied to the motor of the drum washing machine.

Since the drum washing machine has different rotation speeds during the washing stroke and the dehydrating stroke, the RPM of the washing machine and the RPM during the dewatering stroke should be different.

To this end, the drum washing machine of Patent Literature 2 applies a square wave driving method to a motor during washing and rinsing stroke requiring low speed and high torque characteristics, and applies a sine wave driving method to a motor during a dewatering stroke requiring high speed and low torque characteristics. Since the coil usage is reduced because of the application, there is a problem that the efficiency is reduced during the dehydration stroke.

In addition, in a method different from Patent Literature 2, a serial or parallel driving method may be applied. The serial and parallel driving methods increase the dewatering RPM by configuring the coil alignment in series in the washing stroke and in parallel in the dehydrating stroke. However, there is a problem in that a large number of switching elements for direct and parallel driving are required, and peripheral circuits are added to increase the circuit, thereby increasing the cost.

In the prior arts proposed in Patent Documents 1 and 2, there is no suggestion of a drum driving apparatus capable of processing a large amount of laundry with high efficiency, and only a method of increasing the diameter of a motor to increase its size has been commercialized.

However, in general, the single rotor-single stator type single-power motor cannot satisfy the low speed and high torque characteristics in the washing stroke and simultaneously satisfy the high speed and low torque characteristics in the dehydration stroke.

In the case of two driven loads, such as a fully automatic washing machine, that is, a pulsator and a washing tank, the washing stroke and rinsing are performed by separately driving the pulsator and the washing tank using a double rotor-double stator type twin-power motor instead of a single power motor. It is possible to satisfy the characteristics required for administration.

However, in the case of a drum washing machine, since a washing stroke and a dehydration stroke must be performed by using one driven body, that is, a single drum, a double rotor-double stator type twin motor cannot be applied.

Accordingly, the present invention has been made to solve the above problems, the object of which is a combination of a double rotor-double stator drive motor and planetary gear device, which is required in the washing and dewatering stroke of the drum washing machine The present invention provides a drum driving device capable of providing a driving force of various characteristics to a drum with high efficiency and a drum washing machine having the same.

Another object of the present invention is to generate a first output that satisfies the low speed and high torque characteristics during the washing stroke, and to generate a second output that satisfies the high speed and low torque characteristics during the dehydration stroke to drive the drum. The present invention provides a drum driving apparatus capable of implementing a washing machine, a drum washing machine having the same, and a drum driving method.

It is still another object of the present invention to provide a ring gear when a carrier output having low speed and high torque characteristics required for washing and dewatering strokes is generated from a sun gear input having high speed and low torque characteristics through a transmission of a sun gear input-carrier output type. The present invention provides a drum driving apparatus using a transmission capable of continuously controlling a deceleration amount by an applied control input, a drum washing machine and a drum driving method including the same.

Another object of the present invention is to control the rotation and idle amount of the planetary gear to control the deceleration of the carrier output continuously and smoothly by controlling the ring gear input according to the load of the laundry in the sun gear input-carrier output transmission. The present invention provides a drum driving device capable of reducing vibration and noise, a drum washing machine and a drum driving method including the same.

Still another object of the present invention is to use a drum drive device that can realize a high-efficiency drum washing machine by using a combination of a first output having a low speed and high torque characteristic and a second output having a high speed and low torque characteristic according to each stroke. And to provide a drum washing machine having the same.

In order to achieve the above object, according to the present invention, a drum driving apparatus for a drum washing machine is mounted to the rear of the tub, the drive motor of the double rotor-double stator method for generating an independently controllable outer rotor output and inner rotor output; And receiving the outer rotor output as a first input to the sun gear and decelerating it to generate a first output from a carrier, and receiving the inner rotor output as a second input to a ring gear to generate a second output without deceleration, And a planetary gear device configured to apply the first and second outputs generated from the carrier to a drum shaft connected to the drum.

When fixing the ring gear of the planetary gear device or setting the RPM of the second input applied to the ring gear to be smaller than the RPM of the first input, the first input applied to the sun gear is decelerated to reduce the speed and high torque from the carrier. It may generate a first output having a characteristic.

In addition, when a decelerated output is generated from the carrier, when the rotational force in the same direction as the rotational direction of the first input is applied to the ring gear, the RPM of the first output is increased, and the first input to the ring gear is increased. When applying a rotation force in a direction opposite to the rotation direction, the RPM of the first output can be reduced.

When the second input input to the ring gear is output without deceleration to the second output through a plurality of planetary gears and carriers, the sun gear is set to be freely rotatable or the same input as the second input is applied to the sun gear. Can be.

When the ring gear is fixed, the first output having a low speed and high torque characteristic generated from the carrier may be decelerated according to the reduction ratio determined by the number of gear teeth of the sun gear and the ring gear.

The planetary gear device may be rotatably supported in both directions.

Drum drive device for a drum washing machine of the present invention receives the output of the outer rotor motor shaft for transmitting to the first input of the planetary gear device; And an outer shaft rotatably coupled to an outer circumferential surface of the motor shaft and configured to receive the inner rotor output and to transmit the inner rotor output to a second input of the planetary gear device.

The drive motor is a double stator fixed to the back of the tub; An outer rotor disposed with a gap on an outer surface of the stator; And an inner rotor disposed with an air gap on the inner surface of the stator, wherein the output of the outer rotor is applied to the motor shaft, and the output of the inner rotor may be applied to the outer shaft.

The double stator may include a plurality of stator core assemblies each having a plurality of split-core stator cores each having a first coil wound around an outer tooth, a second coil wound around an inner tooth, and assembled into an annular arrangement; And a stator support formed integrally with the plurality of stator core assemblies and having an outer circumferential portion fixed to the rear surface of the tub and rotatably supporting the outer shaft on the inner circumferential portion.

Furthermore, the double stator includes a plurality of outer teeth to which the first coil is wound and a plurality of inner teeth to which the second coil is wound, and the number of slots of the outer teeth may be set larger than the number of slots of the inner teeth. .

The planetary gear device may include a ring gear having one end connected to the outer shaft and the other end rotatably supported by the drum shaft, and the inner rotor output being applied as a second input; A sun gear extending integrally from the motor shaft, having a gear formed at an outer circumference thereof, and wherein the outer rotor output is transmitted to a first input through a motor shaft; A plurality of planetary gears which are geared to the outer surface of the sun gear and the inner surface of the ring gear and which rotate and revolve as the sun gear rotates; And a carrier having one end connected to the planetary gears and the other end connected to an outer surface of the drum shaft to apply first and second outputs to the drum shaft.

In this case, a first input input to the sun gear through the motor shaft is decelerated into a first output through a plurality of planetary gears and a carrier, and a second input input to a ring gear through the outer shaft is a plurality of planetary gears. It can be output without deceleration to the second output via the carrier.

In addition, when the decelerated output from the carrier is generated, the ring gear may be set to a fixed state by an electromagnetic brake, or a minimum RPM driving may be performed.

Furthermore, when the decelerated output is generated from the carrier, the RPM and torque of the second output can be controlled by applying rotational force in the same or opposite direction to the rotational direction of the first input to the ring gear.

The first and second inputs have high speed and low torque characteristics, respectively, and the first output has low speed and high torque characteristics, and is used for washing and rinsing strokes of the drum washing machine. It has a low torque characteristic and can be used for the dewatering stroke of the drum washing machine.

According to the present invention, a drum driving apparatus for a drum washing machine includes: a drum shaft having a drum connected to one end thereof and rotatably supported by a tub; A double stator fixed to a rear surface of the tub and having an outer stator and an inner stator provided at an outer side and an inner side thereof; An outer rotor disposed with a gap on an outer surface of the outer stator; An inner rotor disposed with a gap in an inner surface of the inner stator; A motor shaft to which one of the outer rotor outputs is applied; An outer shaft rotatably coupled to an outer circumferential surface of the motor shaft and to which the inner rotor output is applied; And a planetary gear device configured to decelerate and transmit a first input input to the sun gear through the motor shaft to the drum shaft, and a second input input to the ring gear through the outer shaft to the drum shaft without deceleration. It is characterized by.

When a decelerated output is generated from the carrier, when a rotational force is applied to the ring gear in a second input in the same direction as the rotational direction of the first input, the RPM of the carrier output is increased and the first input to the ring gear is increased. RPM of the carrier output may be reduced when a rotational force in a direction opposite to the direction of rotation is applied to the second input.

The first input input to the sun gear is torque converted to a first output having a low speed and high torque characteristic required for the washing and rinsing stroke of the drum washing machine, and the second input input to the ring gear is a dehydration stroke of the drum washing machine. It may be output without torque conversion to a second output having a high speed and low torque characteristic required for.

The planetary gear device may be rotatably supported by an outer shaft connected to one side of the ring gear and the other end of the ring gear.

The drum drive apparatus for a drum washing machine of the present invention includes first and second drivers for independently applying a driving signal to the first and second coils wound on the outer stator and the inner stator of the double stator; And a control unit for applying a control signal according to each stroke of the drum washing machine to the first and second drivers.

The tub may include a fan-shaped protrusion and a recess, and the stator support extending from the outer stator may be fixed to the protrusion.

According to the present invention, a drum washing machine includes: a tub suspended in a case and containing wash water; A drum disposed inside the tub and containing laundry; And a drum driving device mounted to a rear surface of the tub and rotating the drum shaft connected to one end of the tub.

The planetary gear device has an outer shaft connected to one end of the ring gear rotatably supported by the first and second sleeve bearings on the motor shaft, and the other end of the ring gear rotates through the third sleeve bearing on the drum shaft. Possibly supported.

In addition, the planetary gear device may be rotatably supported by a first bearing installed at one end of the tub and rotatably supported by a second bearing installed at the stator support of the driving motor.

According to the present invention, a driving method of a drum washing machine is a driving method of a drum washing machine including a washing stroke, a rinsing stroke and a dehydration stroke in a drum drive device having a double rotor-double stator type drive motor and a planetary gear device. The washing or rinsing stroke may include rotating the outer rotor of the driving motor and applying a first input having high speed and low torque to the sun gear of the planetary gear device through a motor shaft; When the ring gear of the planetary gear device is fixed or when the RPM of the second input applied to the ring gear is set smaller than the RPM of the first input, the first input applied to the sun gear is decelerated to reduce the speed and high torque characteristics from the carrier. Generating a first output having a; And receiving a first output from the carrier to rotate the drum.

The condition applied to the ring gear of the planetary gear device is to fix the ring gear or to rotate the ring gear at the minimum RPM.

The dewatering stroke may include applying a second input to a ring gear of the planetary gear device through an outer shaft rotatably coaxially coupled to an outer circumference of the motor shaft by rotating the inner rotor of the drive motor; A second input of the inner rotor input to the ring gear generates a second output from a carrier without torque conversion; And receiving a second output from the carrier to rotate the drum.

In addition, when a second output is generated from the carrier, a second input is applied to the ring gear via an outer shaft, and the sun gear is set to be freely rotatable, or the same input as the second input is applied to the sun gear. Can be authorized.

The first input may have high speed and low torque characteristics, and the first output may have low speed and high torque characteristics.

According to the present invention, a drum drive device for a drum washing machine includes: a drive motor of a double rotor-double stator type mounted on a rear surface of a tub and generating independently controllable first and second outputs; A first power transmission line for transmitting said first output; A second power transmission line coupled coaxially to an outer circumference of the first power transmission line to transmit a second output; And receiving a first output transmitted through the first power transmission line as a first input to the sun gear, rotating and revolving a plurality of planetary gears, and transmitting a second output transmitted through the second power transmission line to the ring gear. It receives two inputs to control the amount of revolution and the amount of rotation of the planetary gear to make a continuous shift, the sun gear input-carrier output type transmission that the shifted output is applied to the drum shaft through a carrier; do.

When the decelerated output from the carrier is generated, the ring gear can be set to a fixed state by an electromagnetic brake or a minimum RPM drive can be made.

In addition, when applying a rotational force in the same direction as the rotational direction of the first input to the ring gear, the RPM of the carrier output is increased, and when applying a rotational force in a direction opposite to the rotational direction of the first input to the ring gear The RPM of the carrier output is reduced.

According to the present invention, a driving method of a drum washing machine includes: driving a drive motor of a double rotor-double stator method to generate first and second powers that can be independently controlled; Transmitting the first power through a first power transmission line, and transmitting the second power through a second power transmission line coaxially coupled to an outer circumference of the first power transmission line; And transmitting the first power to the sun gear of the transmission to rotate and revolve the plurality of planetary gears, and transmitting the second power to the ring gear to control the amount of rotation and rotation of the plurality of planetary gears to the drum shaft. And controlling a shift amount of the carrier output to be applied.

When the decelerated output is generated from the carrier, the ring gear may be fixed or the RPM of the second power applied to the ring gear may be set smaller than the RPM of the first power.

As described above, the drum drive device of the present invention combines a double rotor-double stator type twin drive motor and a planetary gear device that acts as a transmission, thereby driving the driving force of various characteristics required in the washing and dewatering stroke of the drum washing machine. The drum can be provided with high efficiency.

In addition, the present invention can implement a high-efficiency large-capacity drum washing machine by driving the drum by using a twin force that satisfies the low speed, high torque characteristics during the washing stroke, and satisfies the high speed, low torque characteristics during the dehydration stroke.

In the present invention, a control input applied to a ring gear when generating a carrier output having a low speed and high torque characteristic required for washing and dewatering stroke from a sun gear input having a high speed and low torque characteristic through a sun gear input-carrier output transmission. The deceleration amount can be controlled continuously by

In addition, in the present invention, by detecting the load of the laundry and controlling the ring gear input according to the load of the laundry, it is possible to continuously and smoothly control the deceleration of the carrier output by controlling the amount of rotation of the planetary gear and the amount of idle.

In other words, the planetary gear unit acts as a continuously variable transmission that generates a carrier output by continuously changing the RPM of the sun gear input according to the ring gear control input. Therefore, the planetary gear device can greatly reduce vibration and noise of the drum washing machine when used in a drum driving device. do.

In the present invention, a high-efficiency drum washing machine can be realized by using a combination of a first output having a low speed and high torque characteristic and a second output having a high speed and low torque characteristic according to each stroke.

1 is an axial cross-sectional view of a drum washing machine according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the drum driving apparatus shown in FIG. 1.

3 is a schematic cross-sectional view of a driving motor in accordance with an embodiment of the present invention.

4 is a schematic cross-sectional view of a stator according to an embodiment of the present invention.

5 is a plan view of a stator core according to an embodiment of the present invention.

6 is a rear perspective view illustrating a tub of a drum washing machine to which a drum drive device of the present invention is attached.

7 is a block circuit diagram illustrating a washing machine control device according to the present invention.

8 is a signal flow diagram showing the operation of the washing machine control apparatus according to the washing machine driving method of the present invention.

9 is an axial sectional view of a drum drive device according to a second embodiment of the present invention.

10 is a schematic plan view of a planetary gear apparatus according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, a drum washing machine according to a first embodiment of the present invention includes a case in which a cover that is openable and closed on one side, a tub 110 suspended by a damper inside the case, and in which washing water is received. The drum 120 is rotatably supported in the tub 110 to accommodate the laundry, and a drum driving device for supplying the driving force necessary for washing, rinsing, loosening and dewatering strokes to the drum 120. 100).

The drum driving device 100 is mounted on the rear surface of the tub 110, the drive motor 130 of the double rotor-double stator method for generating a high-speed, low-torque twin power to rotate the drum 120, and In the first output to satisfy the low speed and high torque characteristics required in the washing stroke and the rinsing stroke by receiving the high speed and low torque output of the outer rotor 30 and the inner rotor 40 of the drive motor 130, And a planetary gear device 70, which is a torque converter for selectively decelerating (torque converting) to provide one of the second outputs satisfying the required high speed and low torque characteristics.

The planetary gear device 70 serves as a transmission of the sun gear input-carrier output type, and generates a carrier output having low speed and high torque characteristics required for washing and dewatering strokes from the sun gear input having high speed and low torque characteristics. The deceleration amount of the carrier output can be continuously controlled by the control input applied to the ring gear.

In addition, in the present invention, the load of the laundry is detected by a load detection sensor (not shown) that detects the load of the laundry, and the amount of rotation of the planetary gear and the amount of revolution of the planetary gear are controlled by controlling the ring gear input according to the detected load. Therefore, the deceleration amount of the carrier output applied to the drum shaft can be continuously controlled to have an appropriate torque value linked to the load amount of the laundry.

 As will be described later, when the planetary gear device 70 applies rotational force in the same direction as the sun gear input to the ring gear input, the deceleration amount of the carrier output decreases, and when the rotational force in the opposite direction to the sun gear input is applied to the ring gear input, the carrier The deceleration of the output will increase.

The planetary gear device 70 acts as a continuously variable transmission that generates a carrier output by continuously changing the RPM of the sun gear input according to the ring gear control input, and when used in a drum driving device, greatly reduces vibration and noise of the drum washing machine. It becomes possible.

The planetary gear device 70 is installed between the drive motor 130 and the drum 120, and outputs the outputs of the outer rotor 30 and the inner rotor 40 of the drive motor 130 to the motor shaft 12 and the outer, respectively. It is received through the shaft 60. Thereafter, the first input input to the motor shaft 12 is transmitted to the drum shaft 10 as the output of the carrier 78 after deceleration (torque conversion) while passing through the sun gear 74 and the planetary gear 76, and the outer The second input received through the shaft 60 to the ring gear 72 is transmitted to the drum shaft 10 at the output of the carrier 78 without deceleration (torque conversion). The structure and operation of the planetary gear device 70 will be described in detail later.

The tub 110 has a through hole 118 through which the drum shaft 10 passes, a bearing housing 113 is fixedly installed on an inner surface of the through hole 118, and a drum shaft 10 is installed in the bearing housing 113. ) Is equipped with a pair of first and second bearings 114 and 116 rotatably supporting.

In addition, between the first bearing 114 and the second bearing 116, that is, the right side of the first bearing 114, a fixing member 16 for suppressing the leftward flow of the drum shaft 10 is provided with a drum shaft ( 10) is fastened. For example, the fixing member 16 may use a fixing nut or a snap ring. In addition, a fixing member (not shown) for restraining the rightward flow of the drum shaft 10 is also fastened to the drum shaft 10 on the left side of the first bearing 114, or to the outer diameter of the drum shaft 10. You can solve this by placing a step.

As such, the drum shaft 10 may be supported more firmly because the drum shaft 10 is supported by the tub 110 by the first and second bearings 114 and 116. In addition, a seal may be installed between the through hole 118 and the drum shaft 10 to prevent the washing water from flowing out.

The driving motor 130 has a stator 20 fixed to the rear surface of the tub 110, an outer rotor 30 disposed with a predetermined gap on the outer circumferential surface of the stator 20, and a predetermined gap on the inner circumferential surface of the stator 20. The inner rotor 40 is disposed to be disposed, and the stator 20 has a double stator structure for independently driving the outer rotor 30 and the inner rotor 40, respectively.

Accordingly, the stator 20 drives the outer stator and the inner stator to selectively and independently drive the outer rotor 30 and the inner rotor 40 using the first and second drivers 530 and 540 shown in FIG. 7. Equipped. In the following description of the embodiments described below, the outer stator and the inner stator are illustrated as being integrally formed. However, the outer stator and the inner stator may have a separate structure.

As will be described later, the output of the outer rotor 30 of the drive motor 130 is input to the sun gear 74 of the planetary gear device 70 is converted into torque and then output to the first output, the output of the inner rotor 40 is It is input to the ring gear 72 of the planetary gear device 70 through the outer shaft 60 and output to the second output without torque conversion.

The output of the outer rotor 30 and the inner rotor 40 of the drive motor 130, that is, the first and second inputs input to the sun gear 74 and the ring gear 72 of the planetary gear device 70, respectively, are high speed. , Has a low torque characteristic, the torque converted first output satisfies the low speed, high torque characteristics required in the washing stroke, the second output output without torque conversion satisfies the high speed, low torque characteristics required in the dehydration stroke Let's do it.

1 and 2, the output of the outer rotor 30 is input to the sun gear 74 of the planetary gear device 70, and the output of the inner rotor 40 is the planetary gear device 70. The combination input to the ring gear 72 of the is employ | adopted.

2 and 3, the outer rotor 30 is disposed with a predetermined gap on the outer surface of the stator 20, and a plurality of first magnets 32 and N-poles and S-poles alternately arranged, and a first magnet. The first back yoke 34 and the first magnet 32 and the first back yoke 34 are integrally fixed to each other and the other end is connected to the motor shaft 12 so that the planetary gear device ( An outer rotor support 36 that rotates with the sun gear 74 of 70.

The outer rotor support 36 is formed in a cup shape having one side opened, and accommodates the stator 20 inside, and the planetary gear device 70 is accommodated in the center.

In addition, as shown in FIG. 6, the tub 110 has a plurality of protrusions 111 protruding radially, and a plurality of recesses 112 are radially disposed between the plurality of protrusions 111. .

The tub fixing portion 216 of the stator support 200 is fixed to the plurality of protrusions 111 by a bolt 280 as shown in FIG. 2, and the stator support 200 and the outer and inner rotor supports 36 and 46 are A plurality of through holes may be provided for the circulation of air, and the outside cold air through the plurality of recesses 112 may condense through the plurality of through holes to heat heat generated from the stator 20. To be discharged.

The outer rotor support 36 is molded with a thermosetting resin, for example, a BMC (Bulk Molding Compound) molding material such as polyester or a thermoplastic resin, and thus, the first magnet 32 and the first back yoke 34. It is formed integrally with.

When the outer rotor support 36 is made of a magnetic circuit forming material instead of resin, the first back yoke 34 is removed as shown in FIG. 2, and the first magnet 32 is attached to the outer rotor support 36 as an adhesive. It can be fixed by using a known fastening means.

The inner side of the outer rotor support 36 includes a first connection portion 36e coupled to the outer surface of the motor shaft 12 with a wide contact area. The first connection portion 36e may have a structure in which protrusions are formed on the outer surface of the motor shaft 12 to be serration coupled or spline coupled, and may have a structure in which key grooves are keyed to each other.

At the lower end of the motor shaft 12, the first fixing member 50 is fastened together with the washer to prevent the outer rotor support 36 from being separated from the motor shaft 12. For example, the first fixing member 50 may use a fixing nut or a snap ring.

The inner rotor 40 is disposed with a predetermined gap on the inner surface of the stator 20, and is arranged on the back of the second magnet 42 and the plurality of second magnets 42 in which the N pole and the S pole are alternately arranged. A second back yoke 44 and an inner rotor support 46 formed integrally with the second magnet 42 and the second back yoke 44 by insert molding and having the other end connected to the motor shaft 12. do.

Here, the inner rotor support 46 is formed integrally with the second magnet 42 and the second back yoke 44 by molding with a thermosetting resin or thermoplastic resin.

In addition, when the inner rotor support 46 is made of a magnetic circuit forming material instead of resin, the second back yoke 44 is removed as shown in FIG. 2 and the second magnet 42 is adhesively bonded to the inner rotor support 46. It can be fixed using, for example.

The inner rotor support 46 is formed on the outer surface of the second magnet 42 and the second back yoke 44 integrally. The inner rotor support 46 has a cup shape to accommodate the third bearing 92 that supports the planetary gear device 70 therein.

The inner rotor support 46 includes a second connecting portion 46e coupled to an outer surface of the outer shaft 60. A second fixing member 52 is fastened to the outside of the second connecting portion 46e to prevent the second connecting portion 46e from being separated from the outer shaft 60. For example, the second fixing member 52 may use a fixing nut or a snap ring.

A cylindrical outer shaft 60 is disposed on the outer surface of the motor shaft 12 with a predetermined gap, and an inner surface of the outer shaft 60 has a cylindrical first sleeve bearing 80 and a second sleeve bearing 82. ) Are installed at intervals to rotatably support the motor shaft 12.

The outer shaft 60 is disposed on the outer surface of the motor shaft 12 and is rotatably supported by the third bearing 92 on the outer surface thereof, and one end of the cylindrical portion 62. It is bent in the form of a disk extending to cover one side of the planetary gear device 70 and the outer peripheral portion includes a disk portion 64 connected to the ring gear 72.

That is, a third bearing 92 is provided on the outer surface of the outer shaft 60, and the outer shaft 60 is rotatably supported by the third bearing 92. Since the third bearing 92 is mounted on the bearing mounting portion 217 formed on the stator support 200 to be described later, a separate bearing housing for mounting the third bearing 92 is unnecessary, thereby simplifying the structure and reducing the number of parts. Can be reduced.

In addition, inside the cylindrical portion 62 of the outer shaft 60, both sides are positioned by protrusions 80a and 82a protruding from both sides of the first sleeve bearing 80 and the second sleeve bearing 82. The second sleeve bearing 82 is fixed in position as the first connection part 36e is fastened to the motor shaft 12.

The planetary gear device 70 includes a ring gear 72 having one end connected to the disc portion 64 of the outer shaft 60, and a sun gear 74 integrally connected to the motor shaft 12 and having a gear portion at an outer surface thereof. , The inside and the outside of the sun gear 74 and the inner surface of the ring gear 72 is geared, respectively, and has a rotary shaft 76a, respectively, the rotation of the sun gear 74 and the inner surface of the ring gear 72 The planetary gear 76 includes a plurality of planetary gears 76 and a carrier 78 having one side connected to the rotation shaft 76a of the plurality of planetary gears 76 and the other side connected to the outer surface of the drum shaft 10.

The third sleeve bearing 14 is rotatably coupled to the outer surface of the drum shaft 10, and the other extension portion 72a of the ring gear 72 is fixed to the outer surface of the third sleeve bearing 14 so that the ring One end of the gear 72 is rotatably supported. The third sleeve bearing 14 may use a bushing.

As described above, one side of the ring gear 72 is rotatably supported by the outer shaft 60 by the first sleeve bearing 80, the second sleeve bearing 82, and the third bearing 92. Since the other end of the gear 72 is rotatably supported by the third sleeve bearing 14, the both ends of the planetary gear device 70 are rotatably supported in both directions.

In particular, the planetary gear device 70 has high axial stability and planetary gears as both ends thereof are stably supported by the first to third sleeve bearings 80, 82, 14 and the third bearing 92 disposed at intervals. Suppression of vibration caused by rotation of the device 70 is suppressed. In this case, the third bearing 92 has one end of the planetary gear device 70 stably as the outer circumferential portion is installed in the bearing mounting portion 217 formed on the inner circumference of the stator support 200 fixed to the rear surface of the tub 110. I support it.

In the present invention, since the rotational force is selectively or simultaneously applied to the sun gear 74 and the ring gear 72 of the planetary gear device 70, if both ends of the planetary gear device 70 are not stably supported, it may cause vibration. And durability can be reduced.

Here, the first to third bearings (114, 116, 92) it is preferable to apply a ball-type bearing in order to improve the durability.

The other end of the carrier 78 is connected to the outer surface of the drum shaft 10 so that the rotational force of the carrier 78 is transmitted to the drum shaft 10. The other end inner surface of the carrier 78 is formed with a third connecting portion 13 connected to the drum shaft 10. Here, the third connecting portion 13 may have a structure in which protrusions are formed on the outer surface of the drum shaft 10 to be serration-coupled or spline-coupled, and have a structure in which key grooves are mutually key-coupled to each other. Can be.

The operation of the planetary gear device 70 will be described.

First, when the outer rotor 30 is rotated, the outer rotor support 36 is connected to the sun gear 74 through the motor shaft 12 so that the rotational force of the outer rotor 30 is transmitted to the sun gear 74. In this case, the inner rotor 40 is set to a stopped state by applying an electromagnetic brake by driving control of the inner stator located inside the stator 20 by the second driver (ie, inverter) 540, The resulting ring gear 72 is also set in a fixed state.

When rotation force is applied to the sun gear 74 in a state in which the ring gear 72 is fixed, the sun gear 74 and the plurality of planetary gears 76 geared are rotated while rotating along the inside of the ring gear 72. As a result, the carrier 78 connected to the rotational axis 76a of the planetary gear 76 is rotated. At this time, the rotation speed of the sun gear 74 is reduced by the gear combination between the sun gear 74 and the planetary gear 76 is transmitted to the carrier 78.

Since the carrier 78 is connected to the drum shaft 10 through the third connecting portion 13, the rotational speed of the inner rotor 40 is decelerated while passing through the planetary gear device 70, so that the low speed required by the washing stroke, The high torque first output is transmitted to the drum shaft 10.

Therefore, the output of the outer rotor 30 is transmitted to the drum shaft 10 is reduced in the rotational speed through the planetary gear device (70). As a result, it is possible to increase the rotational torque of the drum 120 connected to the drum shaft 10, and accordingly, the drive motor 130 of the present invention is a large-capacity drum requiring the characteristics of low speed and high torque at the washing stroke Applicable to washing machines.

On the other hand, when the inner rotor 40 is rotated in the non-fixed state, that is, the free rotation state, in contrast to the above, since the inner rotor support 46 and the outer shaft 60 are connected, the inner rotor 40 ) Is transmitted to the ring gear 72 through the outer shaft (60).

In this case, since the outer rotor 30 is freely rotatable, the sun gear 74 is also freely rotatable. Therefore, the rotational force applied to the ring gear 72 is the ring gear 72 around the sun gear 74. It is transmitted to the drum shaft 10 through the third connecting portion 13 without the reduction of the rotation speed through the planetary gear 76 and the carrier 78 is rotated with.

Therefore, the rotational force of the inner rotor 40 is transmitted to the drum shaft 10 as the second output of the high speed, low torque required in the dehydration stroke, without the rotation speed being substantially reduced while passing through the planetary gear device 70.

3 is a schematic cross-sectional view of a driving motor in accordance with an embodiment of the present invention, Figure 4 is a schematic cross-sectional view of a stator according to an embodiment of the present invention, Figure 5 is a stator core according to an embodiment of the present invention Top view of the.

3 to 5, the stator 20 includes a plurality of stator core assemblies 21 annularly arranged, a plurality of stator core assemblies 21 annularly arranged, and an outer circumferential portion of the stator 20 at the rear of the tub 110. It includes a stator support 200 (see FIG. 2), which is fixed and forms a bearing mount 217 at an inner circumference thereof to support the third bearing 92.

The plurality of stator core assemblies 21 may be divided into a split core type stator core 22 which is arranged in an annular shape and coupled to each other as illustrated in FIGS. 3 and 4, and a coil winding region on an outer circumferential surface of each of the split core type stator cores 22. The bobbin 24 is made of an insulating material which is wrapped to define the non-magnetic material, the first coil 26 wound around one side (outside) bobbin of the stator core 22, and the other side (inside) of the stator core 22. And a second coil 28 wound around the bobbin.

In the exemplary embodiment illustrated in FIG. 3, the stator cores around which the coils 26 and 28 are wound are arranged to have an annular shape, and thus, the plurality of split core type stator cores 22 are connected to each other. It is also possible that the stator core is composed of an integral or partially split core without being limited thereto.

The split core type stator core 22 has the advantage that the coil winding can be easily manufactured at low cost using a low cost general purpose winding machine as compared with the integral stator core, and it is possible to reduce the loss of the core material.

The split core type stator core 22 is disposed at an outer side of the stator core 22, and is formed at an opposite side and an inner side of the first tooth portion 220 on which the first coil 26 is wound. Of the second tooth portion 222 on which the second coil 28 is wound, the partition portion 224 partitioning between the first tooth portion 220 and the second tooth portion 222, and the partition portion 224. It is formed at both ends in the lateral direction includes a coupling portion (230,232) for interconnecting between the split core-like core (22).

In the stator 20 of the present invention, the first coil 26 wound around the first tooth portion 220 of the stator core 22 to drive the outer rotor 30 and the inner rotor 40 constitutes the outer stator. The second coil 28 wound around the second tooth portion 222 of the stator core 22 forms an inner stator to form a double stator.

In the present invention, as shown in FIG. 7, the driving signal is separately applied from the first and second drivers 530 and 540 to the first coil 26 constituting the outer stator and the second coil 28 constituting the inner stator. The rotor 30 and the inner rotor 40 are driven respectively.

In this case, since the first driving signal is applied from the first driver 530 to the first coil 26 and the second driving signal is applied from the second driver 540 to the second coil 28, the first driving signal is applied to the first coil 26. When the driving signal is applied only to the coil 26, only the outer rotor 30 is rotated. When the driving signal is applied only to the second coil 28, only the inner rotor 40 is rotated, and the first coil 26 and the second coil are rotated. When the driving signal is simultaneously applied to the 28, the outer rotor 30 and the inner rotor 40 are rotated at the same time.

Through-holes 240 are formed in the center of the partition 224 may be used for bolting for integration with the stator support 200.

The first flange portion 250 is formed at the end of the first tooth portion 220 to face the first magnet 32, and the second magnet 42 at the end of the second tooth portion 222. A second flange portion 252 is disposed facing the second flange portion 252 is formed.

The first flange 250 and the second flange portion 252 are inward and at a predetermined curvature so as to correspond to the first magnet 32 of the outer rotor 30 and the second magnet 42 of the inner rotor 40, respectively. It forms an outwardly curved surface. Therefore, since the roundness of the inner circumferential surface and the outer circumferential surface of the stator core 22 is increased, the magnetic gap is constant while the inner circumferential surface and the outer circumferential surface of the stator 20 are close to each other while being close to each other. Can be maintained.

Between the stator cores 22 should have a structure directly connected to each other to form a magnetic circuit. Accordingly, the coupling parts 230 and 322 have a structure in which adjacent stator cores 22 are directly connected to each other.

For example, the coupling parts 230 and 232 are formed such that the coupling protrusion 232 protrudes on one side of the partition 224, and the coupling groove 230 is fitted to the other side of the partition 224. ) Is formed, and when the coupling protrusion 232 is fitted into the coupling groove 230, the stator cores 22 are arranged in an annular shape and have a structure directly connected to each other.

In addition to this structure, the coupling portion forms pinholes at both ends of the partition portion of the stator core, and the pin member is inserted between the pinholes of the two stator cores in a state in which the stator cores are in contact with each other to form a gap between the stator cores. The connecting structure is also applicable, and a method of caulking using a caulking member in a state in which the stator cores are in contact with each other is also applicable.

The manufacturing process of the stator 20 is demonstrated below.

First, a bobbin 24 is integrally formed in each of the plurality of split core type stator cores 22, and the first and second teeth portions 220 and 222 of the first and second teeth portions 220 and 222 of the plurality of split core type stator cores 22 are integrally formed. The second coils 26 and 28 are wound.

The method of winding the first and second coils 26 and 28 is, for example, when configuring a three-phase drive type BLDC motor, each U of the first and second teeth portions 220 and 222 for each tooth. One-winding coil method for winding the first and second coils 26 and 28 with different phases of V and W, and the first and second phases with different U, V and W phases every two teeth. In the two-winding coil method of winding two coils 26 and 28, the three-winding coil method of winding the first and second coils 26 and 28 by varying the U, V, and W phases every three teeth. Subject to change.

Winding the first and second coils 26, 28 on the bobbin 24 of the plurality of split cored stator cores 22 results in a plurality of stator core assemblies 21. The plurality of stator core assemblies 21 obtained are made of insert molding in order to be integrated with the stator support 200 to be annularly assembled.

The plurality of stator core assemblies 21 may be preassembled in an annular form by connecting all coupling portions 230 and 232 of the plurality of split core type stator cores 22 or partially assembled in U, V, and W phases. After assembling and installing in the mold or assembling the split core type stator core 22 in the mold, the stator support 200 is integrally formed with the plurality of stator core assemblies 21 by insert molding.

That is, the stator support 200 is integrally molded with the plurality of stator core assemblies 21 by insert molding using a thermosetting resin, for example, a BMC (Bulk Molding Compound) molding material such as polyester or a thermoplastic resin.

The stator support 200 is manufactured by insert molding, in addition to the structure formed integrally with the plurality of stator core assemblies 21, and separately manufactured the stator support 200 and the plurality of stator core assemblies 21, respectively, and then the stator core. It is also possible to bolt to the through hole 240 of the assembly 21 to be integrated with the stator support 200.

The stator support 200 is a core fixing portion 213 integrally formed on the inner side surfaces of the plurality of stator core assemblies 21 by insert molding, and a first connection extending bent at right angles from the core fixing portion 213. At the tub fixing part 216 and the core fixing part 213 which are bent at right angles to the member 214 and the first connecting member 214 and then extend in a radial direction to be fixed to the tub 110 by bolts 280. The second connecting member 215 is bent at right angles and extends to surround the inner rotor 40 therein, and is bent at a right angle at the second connecting member 215 and then extended in the center direction to extend the third bearing 92. Bearing mounting portion 217 to be mounted.

As such, since the tub fixing part 216 is formed at the outer end of the stator support 200 and is directly fixed to the tub 110, a separate fixing frame for fixing the stator support 200 to the tub 110 is unnecessary. The number of parts can be reduced, and the structure can be simplified.

In addition, the stator support 200 has a bearing mounting portion 217 in which the third bearing 92 is mounted at the inner end thereof, so that a separate bearing housing for mounting the third bearing 92 is unnecessary, thereby reducing the number of parts. And the structure can be simplified.

The stator support 200 is disposed inside the outer rotor 30 and the inner rotor 40, and a third bearing 92 is installed at an inner circumference thereof to support the outer shaft 60 so as to rotatably support the planetary gear device ( 70 is also rotatably supported.

Outside the stator support 200, a connector (not shown) for applying the first and second driving signals to the first coil 66 and the second coil 68 from the control unit is installed.

As described above, the drum driving apparatus of the present invention forms a first magnetic circuit L1 between one side of the stator 20 on which the outer rotor 30 and the first coil 26 are wound, that is, the outer stator, as shown in FIG. 3. Since the second magnetic circuit L2 is formed between the other side of the stator 20 on which the inner rotor 40 and the second coil 28 are wound, that is, the inner stator, each of the inner rotors 30 forms an independent magnetic circuit. ) And the outer rotor 40 may be driven separately.

In detail, the first magnetic circuit L1 includes the first magnet 32 of the N pole, the first tooth portion 220 on which the first coil 26 is wound, the outer part of the partition 224, and the N pole of the N magnetic pole. Via the first magnet 32 and the first back yoke 34 of the S pole adjacent to the first magnet 32.

The second magnetic circuit L2 is divided into a second tooth portion 222 facing the second magnet 42 of the N pole, the second magnet 42 of the N pole, and the second coil 28 wound around the second magnet 42. Via the inner part of the part 224, the 2nd magnet 42 of the S pole, and the 2nd back yoke 44. As shown in FIG.

However, the first and second magnetic circuits L1 and L2 may pass the first and second coils 26 and 28 wound around the first and second tooth portions 220 and 222 for each tooth. One-winding coil method for winding in different phases, U, V, W every two teeth Winding coil method for winding in different phases, U, V, W for every three teeth It can be changed according to the three winding coil method and the driving method of winding by different.

3 to 5, the stator 20 prepares the plurality of stator core assemblies 21 using the plurality of split core type stator cores 22, and then the plurality of stator core assemblies 21. By coupling the stator support 200 with the stator support 200, the number of slots of the outer stator and the inner stator are manufactured to be the same. However, the present invention is not limited thereto and various modifications are possible.

For example, in the present invention, the number of slots of the outer stator and the inner stator may be differently set in a direction advantageous for increasing the efficiency of the driving motor and the washing machine while employing the integrated stator core or the partially split core as the stator core. . In general, it is preferable from the viewpoint of efficiency that the number of slots of the stator core is small for high speed and low torque rotation, and the number of slots of the stator core is high for low speed and high torque rotation.

For example, as in the first and second embodiments shown in Figs. 1 and 9, the output of the outer rotor 30 driven by the outer stator may be used for washing and rinsing strokes. When the output of the inner rotor 40 which is input to the sun gear 74 and driven by the inner stator is input to the ring gear 72 of the planetary gear device 70 to be used for the dehydration stroke, the slot of the outer stator is exhausted. It is preferable to select a (multi) slot structure, and to select a low slot structure for the slot of the inner stator.

Referring to FIG. 7, the washing machine control apparatus according to the present invention includes a first driver 530 generating a first driving signal applied to the first coil 66 and a second driving applied to the second coil 68. A second driver 540 for generating a signal, the first driver 530, the second driver 540 and a control unit 500 for controlling the entire washing machine.

The control unit 500 acts as a system controller to control the entire washing machine simultaneously with the control of the first and second drivers 530 and 540 as described above, or according to the washing course set by the user from the system controller of the washing machine body. After receiving the determined washing control signal may be configured as a driver-specific control device for applying a separate control signal to the first and second drivers (530, 540) based on this. The control unit 500 may be configured as a signal processing device such as a microcomputer or a microprocessor, and has a built-in or separately provided PWM control unit for generating a PWM control signal.

As described above, the drive motor 130 of the present invention is made of a twin-force structure consisting of a double rotor-double stator, for example, the motor control is made by U, V, W three-phase driving method. Accordingly, the first and second coils 26 and 28 of the stator 20 also consist of U, V, and W three-phase coils, respectively.

Stator 20 of the present invention includes an outer stator having a first coil 26 and an inner stator having a second coil 28 to drive the outer rotor 30 and the inner rotor 40, respectively. Form a double stator.

As a result, the inner stator and the inner rotor 40 rotated by the inner stator form the inner motor, and the outer stator and the outer rotor 30 rotated by the outer stator form the outer motor. The outer motor and the inner motor are designed to be controlled by the BLDC method, respectively, and the first and second drivers 530 and 540 are driven by, for example, six-step drive control.

The first and second drivers 530 and 540 each include an inverter composed of three pairs of switching transistors connected in a totem pole structure, and the U, V, and W three-phase outputs of the respective inverters are formed of the first and second coils. 26, 28) is applied to the U, V, W three-phase coil.

The control unit 500 is based on the rotation positions of the outer rotor 30 and the inner rotor 40 detected from the first and second rotor position sensors 510 and 520, respectively, which are formed of, for example, a Hall sensor. PWM control signals are applied to the first and second drivers 530 and 540, and the first and second drivers 530 and 540 receive the control signals and output U, V, and W three-phase outputs to the first and second coils. The outer rotor 30 and the inner rotor 40 are rotationally driven by applying them to the U, V, and W three- phase coils 26 and 28.

The control unit 500 has a program for executing various washing courses in the memory device, and all washing courses basically include washing strokes, rinsing strokes, and dehydrating strokes. Is included before and after, depending on the washing course is performed repeatedly at least one of the washing stroke, rinsing stroke, dehydration stroke.

Thus, the operation of the drum washing machine according to the first embodiment of the present invention constituted will be described next.

Referring to Figure 8, the drum washing machine according to the present invention is first turned on the power of the washing machine in step (S200).

In this state, the control unit 500 determines whether to perform the current washing or rinsing stroke through the washing control signal input according to the user's selection (S202).

As a result of the determination, when the washing or rinsing stroke is performed, the control unit 500 drives the inverters of the first driver 530 and the second driver 540 according to the washing or rinsing stroke (S204).

Then, the first driver 530 and the second driver 540 generates three-phase AC power, the generated three-phase AC power is the first coil 66 and the second coil 68 of the stator 20 The washing is performed by any one of a variety of washing courses as it is applied to the selective, independently generated and applied.

The washing method using the double rotor-double stator type drive motor 130 and the planetary gear device 70 will be described in detail below.

Thereafter, the control unit 500 determines whether to perform the current dehydration stroke in the state where all the rotors are stopped, or if it is not the washing stroke or the rinsing stroke in step S202, It is determined whether or not (S208).

When the dehydration stroke is to be performed as a result of the determination, the control unit 500 may drive only the outer rotor 30 or rotate the outer rotor 30 and the inner rotor 40 in the same direction / same RPM. By controlling the first driver 530 and the second driver 540 to apply the same driving signal to the first coil 26 and the second coil 28, the drum 120 is moved in one direction through the planetary gear device 70. Rotation to perform a dehydration stroke (S212).

Then, the control unit 500 determines whether the execution time of the dehydration stroke has elapsed (S214), and when the time of the dehydration stroke has elapsed, the washing operation of the laundry is terminated.

More specifically, the washing or rinsing stroke according to the present invention described above is as follows.

When the washing or rinsing stroke is performed, the control unit 500 drives the inverters of the first driver 530 and the second driver 540 according to the washing or rinsing stroke.

Then, the first driver 530 and the second driver 540 generates three-phase AC power, the generated three-phase AC power is the first coil 26 and the second coil 28 of the stator 20 Optionally, independently. Accordingly, the outputs of the outer rotor 30 and the inner rotor 40 driven by the first coil 26 and the second coil 28 of the stator 20 have high speed and low torque characteristics, respectively.

First, when performing washing or rinsing stroke, when three-phase AC power is applied from the first driver 530 to the first coil 26 of the outer stator, the outer rotor 30 is rotated and the outer rotor 30 is rotated. The high speed, low torque characteristic output of is transmitted to the motor shaft 12 connected to the outer rotor (30). That is, the output of the outer rotor 30 is applied to the sun gear 74 of the planetary gear device 70 as the first input of the first RPM through the motor shaft 12.

In this case, as the outer shaft 60 and the ring gear 72 connected to the inner rotor 40 are fixed by the electromagnetic brake, the first input of the first RPM from the outer rotor 30 (ie, high speed, low torque). Characteristic input) is input to the sun gear 74, the sun gear 74 is rotated, a plurality of planetary gear 76 is rotated and the revolution along the ring gear 72 is made, the rotary shaft 76a of the planetary gear 76 While the carrier 78 is connected in the same direction as the rotational direction of the outer rotor 30, deceleration is set according to the gear ratio of the sun gear and the ring gear is made so that the first output of the second RPM is the carrier of the planetary gear device 70 Occurs from (78).

As the carrier 78 of the planetary gear device 70 transmits a first output to the drum shaft 10 through the third connecting portion 13, the drum 120 receives a low speed and high torque output to wash or rinse. This is achieved with high efficiency.

The first output is increased in torque as the first input of the first RPM is reduced to the second RPM to satisfy the low speed and high torque characteristics required in the washing stroke and the rinsing stroke.

The shift ratio (ie, the reduction ratio) obtained from the carrier 78 of the planetary gear device 70 is determined as in Equation 1 below.

Where z _r is the number of teeth of the ring gear and z _s is the number of teeth of the sun gear.

The method of applying the electromagnetic brake to the inner rotor 40, the outer shaft 60, and the ring gear 72 by the first driver 530 is, for example, the first of the stator 20 from the first driver 530. The three-phase AC power applied to the single coil 26 or the first coil 26 is shorted to control the outer shaft 60 and the ring gear 72 connected to the inner rotor 40 to stop.

When performing the washing or rinsing stroke, when the outer shaft 60 and the ring gear 72 connected to the inner rotor 40 are not fixed, that is, the ring gear 72 is, for example, about 10 RPM, the sun gear 74. In order to minimize rotation in the same direction as the rotation direction of (), or to reverse the rotation of the ring gear 72 in the direction opposite to the rotation direction of the sun gear 74, that is, outer rotor 30 (-) 10 RPM By driving the inner rotor 40 in the reverse direction, the amount of deceleration of the first output of the planetary gear device 70 output through the carrier 78 can be controlled.

That is, when the first input of the first RPM from the outer rotor 30 is input to the sun gear 74, by intermittently releasing the electromagnetic brake and the rotation direction of the sun gear 74 without completely fixing the ring gear 72. When the rotation is performed in the same direction, the first output of the planetary gear device 70 through the carrier 78 is increased in RPM than the second RPM when the ring gear 72 is completely fixed. When the 72 is rotated in the direction opposite to the rotation direction of the sun gear 74, the first output of the planetary gear device 70 through the carrier 78 is reduced in RPM than the second RPM.

In the present invention, when the first output of the decelerated second RPM from the planetary gear device 70 is obtained by using the rotational force of the outer rotor 30 as a power source for washing or rinsing stroke, the inner rotor 40 after the electromagnetic brake is released. RPM and torque of the first output can be controlled by controlling the forward RPM of or by rotating the inner rotor 40 in reverse.

For example, in the present invention, in the planetary gear device 70 of the sun gear input / carrier output structure, the speed ratio obtained from the carrier 78 is set to 5.33: 1, and the sun gear 74 from the outer rotor 30 is set. In the case where the RPM of the first input inputted to) is 1000 RPM, when the ring gear 72 is stopped, the RPM of the first output of the planetary gear device 70 is obtained at 188 RPM, and the ring gear 72 is forwarded. When 10 RPM rotational force is applied, the first output RPM of the planetary gear device 70 is about 208 RPM, and when (-) 10RPM rotational force is applied in the reverse direction to the ring gear 72, the first output of the planetary gear device 70 is applied. The RPM of about 190 RPM is obtained.

As described above, the planetary gear device 70 according to the present invention operates as a transmission of the sun gear input-carrier output type when generating a first output having a low speed and high torque characteristic required for washing or rinsing stroke. When a carrier output (i.e., first output) having a low speed and high torque characteristic is generated from a sun gear input (i.e., a first input) having high speed and low torque characteristics, the carrier output is controlled by a control input applied to the ring gear. The deceleration can be continuously controlled without permission.

In this case, when the RPM of the second input applied to the ring gear is set smaller than the RPM of the first input applied to the sun gear, the first output decelerated from the first input is generated from the carrier.

In addition, when the rotational force in the same direction as the sun gear input is applied to the ring gear input, the deceleration amount of the carrier output decreases, and when the rotational force in the opposite direction to the sun gear input is applied to the ring gear input, the deceleration amount of the carrier output increases.

The case where the first output decelerated at a predetermined constant deceleration ratio (see Equation 1) with respect to the first input applied to the sun gear is to be generated by completely fixing the ring gear 72.

On the other hand, when performing the dehydration stroke, the planetary gear device 70 receives the high speed, low torque characteristic input to the ring gear 72 and the high speed required in the dehydration stroke through the carrier 78 without deceleration (torque conversion). The second output satisfies the low torque characteristic.

In this case, in order for the planetary gear device 70 to receive the input of the high speed and low torque characteristics and output it without deceleration (torque conversion), the sun gear 74 is set to an unfixed state, that is, a state in which free rotation is possible, or the sun gear 74. It is necessary to set to rotate in the same direction, the same RPM as the ring gear 72.

Accordingly, the driving signal is applied from the second driver 540 to the second coil 28 of the inner stator, so that the inner rotor 40 (ie, the ring gear 72) is forwarded at 1000 RPM of high speed and low torque characteristics. It rotates and freely rotates without applying a drive signal to the outer rotor 30, or rotates the outer rotor 30 in the forward direction at 1000 RPM in the same manner as the inner rotor 40.

As a result, only the ring gear 72 of the planetary gear device 70 is transmitted with the same high speed and low torque characteristics as the first input, or the high speed and low torque characteristics are equal to the ring gear 72 and the sun gear 74. When the rotational force of the first input of the transmission is transmitted, the ring gear 72 or the planetary gear device 70 that is rotatably supported by the first to third sleeve bearings 80, 82, 14 and the third bearing 92. Will rotate without deceleration.

Therefore, the first input of the high speed, low torque characteristic applied to the ring gear 72 rotates the ring gear 72 or the entire planetary gear device 70 so that the drum shaft through the planetary gear 76 and the carrier 78. The transmission is made to (10) without deceleration (torque conversion).

As a result, the first input of the high speed, low torque characteristic, that is, the second output transmitted to the drum shaft 10 without deceleration (torque conversion) satisfies the high speed, low torque characteristic required in the dehydration stroke, and the drum 120 As a result, the dewatering stroke is made highly efficient.

As described above, the planetary gear device 70 according to the present invention operates as a transmission of a ring gear input-carrier output type when it is going to generate a second output having a high speed and low torque characteristic necessary for a dehydration stroke. When the carrier output (i.e., the second output) having the high speed and low torque characteristic is generated from the ring gear input (i.e., the first input) having the high speed and low torque characteristics, the deceleration of the carrier output by the control input applied to the sun gear The amount can be continuously controlled without permission.

When the same sun gear input as the ring gear input is input for the ring gear input having high speed and low torque characteristics, the ring gear input is generated from the carrier without deceleration, and the ring gear input from the carrier when the sun gear input is smaller RPM than the ring gear input. The output of the reduced RPM is generated, and when the sun gear input is a larger RPM than the ring gear input, an output of the RPM is increased from the carrier than the ring gear input and reduced than the sun gear input.

When the planetary gear device 70 operates as a transmission of the ring gear input-carrier output type, this point makes it possible to easily adjust the desired RPM during a dehydration stroke requiring a second output having high speed and low torque characteristics. do.

When the planetary gear device 70 operates as a transmission of the ring gear input-carrier output method, the ring gear input becomes the first input, and the sun gear input serves as the second input as a control input for controlling the deceleration amount of the carrier output. Do it.

Since the gearbox of the ring gear input-carrier output method has a smaller reduction ratio than the transmission of the sun gear input-carrier output method, it is not preferable to apply it to the washing stroke and the rinsing stroke. That is, when the reduction ratio is 1/5 than the transmission of the sun gear input-carrier output system under the same conditions as in the first embodiment described below, the reduction gear ratio becomes 4/5 when driven by the transmission of the ring gear input-carrier output system. A relatively small reduction ratio output is obtained.

In the present invention, when the second output having the high speed and low torque characteristics required for the dehydration stroke is obtained from the carrier without deceleration from the ring gear input having the high speed and low torque characteristics, the input of the same RPM as the ring gear input to the sun gear is required. It is convenient because it can be set to a state in which free rotation is performed without applying an input or applying no input to the sun gear. Therefore, in the present invention, the gears of the ring gear input-carrier output method are operated in a deformed form without fixing the sun gear and are applied to the dehydration stroke.

As described above, the drum washing machine according to the first embodiment performs a washing stroke while passing the planetary gear device 70 using a high-speed, low-torque twin power output generated from the double rotor-double stator drive motor 130. And washing stroke and rinsing stroke and dehydration by applying the drum 120 to a first output satisfying the low speed and high torque characteristics required in the rinsing stroke and a second output satisfying the high speed and low torque characteristics required in the dehydration stroke. The stroke can be executed with high efficiency.

As described above, in the present invention, since both ends of the planetary gear device 70 are rotatably supported in both directions, a washing stroke and a rinsing stroke using a drive motor 130 having a twin-force structure composed of a double rotor-double stator are provided. During the process, even if an excessive load is momentarily applied to the driving motor 130 by the eccentricity of the laundry, the planetary gear device 70 can absorb the active deceleration in the direction of reducing the load on the driving motor 130. This can be achieved, so that the current consumption can be reduced and the efficiency can be increased.

In general, since the outer rotor 30 is implemented with a relatively larger diameter than the inner rotor 40, the outer rotor 30 has a high torque characteristic required for the washing stroke and the rinsing stroke, and the inner rotor 40 ) Is a small diameter, so it has a high speed rotation characteristic necessary for the dehydration stroke.

As described above, in the drum driving apparatus 100 according to the first embodiment of the present invention, the output of the outer rotor 30 having a greater torque characteristic than that of the inner rotor 40 is the output of the planetary gear apparatus 70. It is inputted to the sun gear 74, decelerated (torque converted), and then transmitted to the drum shaft 10 at the output of the carrier 78, where the washing stroke and the rinsing stroke are performed.

Therefore, the drum drive device 100 according to the first embodiment of the present invention proceeds with the dehydration stroke by using the output of the inner rotor 40 having the high speed rotation characteristic sufficient for the dehydration stroke, and the outer rotor having the large torque characteristic. As the output of 30 increases torque through the planetary gear device 70, a large torque driving force that cannot be realized in the conventional drum drive device can be applied to the drum 120, thereby providing a high capacity drum washing machine. Can be implemented as:

11 shows a drum drive device of a second embodiment of the present invention.

The drum drive device 100a according to the second embodiment of the present invention includes a drive motor 130 and a planetary gear device 70 having a double rotor-double stator method similar to the first embodiment described above.

The drum drive device 100a according to the second embodiment of the present invention has a first structure except for a support structure rotatably supporting the planetary gear device 70 when compared to the drum drive device 100 according to the first embodiment. It is substantially the same as the embodiment. The same components as those in the first embodiment are assigned the same member numbers, and detailed description thereof will be omitted.

The difference between the second embodiment and the first embodiment is that the third sleeve bearing 14 is formed integrally with the second bearing 116 provided in the bearing housing 113.

Accordingly, one end of the planetary gear device 70, that is, the other end portion 72a of the ring gear 72 is inserted between the third sleeve bearing 14 and the second bearing 116 to be rotatably supported. Is adopted.

In addition, between the first bearing 114 and the second bearing 116, that is, the right side of the first bearing 114, a fixing member 16 for suppressing the leftward flow of the drum shaft 10 is provided with a drum shaft ( 10) is fastened. For example, the fixing member 16 may use a fixing nut or a snap ring. In addition, a fixing member (not shown) for restraining the rightward flow of the drum shaft 10 is also fastened to the drum shaft 10 on the left side of the first bearing 114, or to the outer diameter of the drum shaft 10. You can solve this by placing a step.

As such, the drum shaft 10 may be supported more firmly because the drum shaft 10 is supported by the tub 110 by the first and second bearings 114 and 116. In addition, a seal may be installed between the through hole 118 and the drum shaft 10 to prevent the washing water from flowing out.

Since the rest of the configuration and operation of the drum drive device 100a according to the second embodiment are the same as in the first embodiment, description thereof will be omitted.

In the above description of the embodiment, a BLDC motor having a radial gap type double rotor-double stator structure is used as a driving motor, but a BLDC motor having an axial gap type double rotor double stator structure is used as a driving power source. It can be used as a drive motor, and any drive motor of different structure and different way can be used as long as the power source generates a pair of outputs.

In addition, in the above-described embodiment, the drum drive device is applied to the ring gear while using the planetary gear device of the sun gear input-carrier output structure for torque conversion (deceleration) of one of the pair of powers generated by the drive motor. Although a shift system that determines the deceleration amount of the carrier output according to the control input is illustrated, a planetary gear device having any structure can be used as long as it can decelerate the input applied from the drive motor.

For example, a transmission system that uses a planetary gear device having a ring gear input-carrier output structure and determines a deceleration amount of the carrier output in accordance with a control input applied to the sun gear can be applied.

(Example 1)

As shown in FIG. 10, the planetary gear device 70 employs four planetary gears, and sets the number of gear teeth to 15, a ring gear: 64, and a planetary gear: 24. Likewise, the outer rotor 30 and the inner rotor 40 are driven to apply RPM inputs of various conditions to the sun gear 74 and the ring gear 72 and measure the output applied to the drum shaft 10 from the carrier 78. It is shown in the table.

No.	Sun gear (RPM)	Ring gear (RPM)	Planetary Gears	Carrier (RPM)	Torque drainage
Condition 1	250	0	-133.3	50	5 times
Condition 2	600	-87	-366.4	50.4	12 times
Condition 3	250	-63	-166.9	-0.4
Condition 4	250	-125	-200	-50	5 times
Condition 5	-250	125	200	50	5 times
Condition 6	500	500	0	500
Condition 7	900	1200	160	1140

Here, (+) indicates clockwise rotation and (-) indicates counterclockwise rotation.

Referring to Table 1 above, as in condition 1, if the RPM of the ring gear is set to zero, that is, the ring gear is fixed by applying an electromagnetic brake, the carrier output is the sun gear according to the transmission ratio = 1/5. It can be seen that 50 RPM reduced to 1/5 of the RPM is obtained, and the torque increases five times.

In addition, as in condition 2 of Table 1, when the sun gear: 600 RPM, the ring gear: (-) 87 RPM, that is, when the ring gear is rotated in the opposite direction to the sun gear, the carrier output is 50.4 RPM, the torque is increased 12 times Was obtained. It can be seen that when the ring gear is rotated in the opposite direction to the sun gear, a transmission ratio larger than the transmission ratio (1/5) when the ring gear is fixed can be obtained.

As in condition 3, when the sun gear: 250 RPM and the ring gear: (-) 63 RPM were used, that is, when the ring gear was rotated in the opposite direction to the sun gear, the carrier output was (-) 0.4 RPM. As in condition 4, when the sun gear: 250 RPM and the ring gear: (-) 125 RPM were rotated, that is, when the ring gear was rotated in the opposite direction to the sun gear, a carrier output of (-) 50 RPM and a torque increase of 5 times were obtained.

Referring to conditions 3 and 4, when the sun gear input RPM is not large, it can be seen that when the sun gear input is applied to the ring gear input in the opposite direction to the sun gear input, the carrier obtains an output in the opposite direction to the sun gear input.

In the condition 5, the direction of the sun gear and the ring gear input were set in the reverse direction as in the condition 4. That is, in the case of sun gear: (-) 250 RPM and ring gear: 125 RPM, that is, when the ring gear was rotated in the opposite direction to the sun gear, a carrier output of 50 RPM and a torque increase of 5 times were obtained.

Summarizing the above conditions 1 to 5, if the RPM of the second input applied to the ring gear is set smaller than the RPM of the first input, the decelerated output from the carrier is generated.

As in condition 6, when the sun gear and the ring gear were in the same direction, the same RPM, that is, the sun gear: 500 RPM and the ring gear: 500 RPM, the carrier output was 500 RPM and the torque was unchanged. In addition, when the RPM of the ring gear is set to the maximum and the sun gear RPM is close to the ring gear as in condition 7, that is, when the sun gear: 900 RPM and the ring gear: 1200 RPM are obtained, the carrier output is 1140 RPM, which is slightly reduced than the ring gear input. lost.

The conditions 1 to 5 may be used when performing washing and rinsing strokes, and the conditions 6 and 7 may be applied to the dehydration stroke.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the spirit of the present invention. Various changes and modifications will be possible by those who have the same.

According to the present invention, the output of the outer rotor satisfies the low speed and high torque characteristics required in the washing stroke through the planetary gear device serving as a transmission, which is a torque converter, and the output of the inner rotor satisfies the high speed and low torque characteristics. By using a drum drive device to provide a large-capacity drum washing machine can be implemented.

Claims (20)

1. A double rotor-double stator drive motor mounted on the rear surface of the tub to generate an independently controllable outer rotor output and an inner rotor output; And

   Receiving the outer rotor output as a first input to the sun gear and decelerating it to generate a first output from a carrier, and receiving the inner rotor output as a second input to a ring gear to generate a second output from the carrier without deceleration, And a planetary gear device for applying the first and second outputs generated from the carrier to the drum shaft connected to the drum.
2. The method of claim 1,

   When fixing the ring gear of the planetary gear device or setting the RPM of the second input applied to the ring gear to be smaller than the RPM of the first input, the first input applied to the sun gear is decelerated to reduce the speed and high torque from the carrier. Drum drive device for a drum washing machine, characterized in that for generating a first output having a characteristic.
3. The method of claim 1,

   When a decelerated output is generated from the carrier, when the rotational force in the same direction as the rotational direction of the first input is applied to the ring gear, the RPM of the first output increases and the rotational direction of the first input to the ring gear When applying the rotational force in the opposite direction and the drum drive of the drum washing machine, characterized in that the RPM of the first output is reduced.
4. The method of claim 1,

   When the second input input to the ring gear is output without deceleration to the second output through a plurality of planetary gears and carriers, the sun gear is set to be freely rotatable or the same input as the second input is applied to the sun gear. Drum drive device for a drum washing machine characterized in that it becomes.
5. The method of claim 1,

   In the case where the ring gear is fixed, a first output having a low speed and high torque characteristic generated from the carrier is decelerated according to a reduction ratio determined by the number of gear teeth of the sun gear and the ring gear. .
6. The method of claim 1,

   A motor shaft which receives the output of the outer rotor and transmits the output to the sun gear of the planetary gear device as a first input; And

   And an outer shaft rotatably coupled to an outer circumferential surface of the motor shaft, the outer shaft receiving the inner rotor output and transferring the inner shaft output to a ring gear of a planetary gear device as a second input.
7. The method of claim 6,

   The planetary gear device

   A ring gear having one end connected to the outer shaft and the other end rotatably supported by the drum shaft, and the inner rotor output being applied as a second input;

   A sun gear extending integrally from the motor shaft, having a gear formed at an outer circumference thereof, and wherein the outer rotor output is transmitted to a first input through a motor shaft;

   A plurality of planetary gears which are geared to the outer surface of the sun gear and the inner surface of the ring gear and which rotate and revolve as the sun gear rotates; And

   And a carrier having one end connected to the planetary gears and the other end connected to an outer surface of the drum shaft to apply first and second outputs to the drum shaft.
8. The method of claim 1,

   The double stator of the drive motor

   A plurality of stator core assemblies each having a plurality of split-core stator cores each having a first coil wound around the outer tooth and a second coil wound around the inner tooth, and assembled into an annular arrangement; And

   And a stator support which is integrally formed with the plurality of stator core assemblies and whose outer circumference is fixed to the rear surface of the tub and rotatably supports the outer shaft to the inner circumference.
9. The method of claim 1,

   The double stator of the driving motor includes a plurality of outer teeth to which the first coil is wound and a plurality of inner teeth to which the second coil is wound,

   The slot number of the outer teeth is set to be larger than the slot number of the inner teeth Drum drive device for a drum washing machine, characterized in that.
10. The method of claim 1,

    The first and second inputs have high speed and low torque characteristics, respectively

    The first output has a low speed, high torque characteristics, is used for the washing stroke and the rinsing stroke of the drum washing machine,

    The second output has a high speed, low torque characteristics, drum driving apparatus for a drum washing machine, characterized in that used in the dehydration stroke of the drum washing machine.
11. A tub suspended inside the case and containing wash water;

    A drum provided inside the tub to accommodate laundry;

    A drum shaft rotatably mounted to the tub and connected to one end of the drum; And

    And a drum driving device mounted to the rear surface of the tub and rotating the drum shaft.

    The drum drive device

    A drive motor of a double rotor-double stator type mounted on a rear surface of the tub and generating independently controllable first and second outputs;

    A first power transmission line for transmitting said first output;

    A second power transmission line coupled coaxially to an outer circumference of the first power transmission line to transmit a second output; And

    Receives a first output transmitted through the first power transmission line as a first input to the sun gear and rotates and revolves a plurality of planetary gears, and a second output transmitted through the second power transmission line to the ring gear It includes a planetary gear device that receives the input to control the amount of revolution and the amount of rotation of the planetary gears to achieve a continuous shift, the shifted output is applied to the drum shaft through the carrier;

    When a decelerated output is generated from the carrier, when a rotational force is applied to the ring gear in a second input in the same direction as the rotational direction of the first input, the RPM of the carrier output is increased and the first input to the ring gear is increased. The drum washing machine, characterized in that the RPM of the carrier output is reduced when the rotational force in the opposite direction to the rotational direction of the carrier output.
12. The method of claim 11,

    The first input input to the sun gear is torque converted into a first output having a low speed, high torque characteristics required for the washing stroke and the rinsing stroke of the drum washing machine,

    And a second input input to the ring gear is output without torque conversion to a second output having a high speed and low torque characteristic required for a dehydration stroke of the drum washing machine.
13. The method of claim 11,

    First and second drivers for independently applying a driving signal to the first and second coils wound around the outer stator and the inner stator of the double stator; And

    And a control unit for applying a control signal according to each stroke of the drum washing machine to the first and second drivers.
14. The method of claim 11,

    The tub is a drum washing machine, characterized in that the fan-shaped projection and the recess is disposed radially, the stator support extending from the outer stator is fixed to the projection.
15. The method of claim 11,

    The planetary gear device is a drum washing machine, characterized in that the outer shaft connected to one side of the ring gear and the other end of the ring gear is rotatably supported.
16. The method of claim 11,

    The planetary gear device has an outer shaft connected to one end of the ring gear rotatably supported by the first and second sleeve bearings on the motor shaft, and the other end of the ring gear rotates through the third sleeve bearing on the drum shaft. Drum washing machine, characterized in that possible supported.
17. The method of claim 11,

    The planetary gear device is a drum washing machine, one end of which is rotatably supported by a first bearing installed on a tub, and the other end of which is rotatably supported by a second bearing installed on a stator support of the driving motor.
18. A driving method of a drum washing machine which performs a washing stroke, a rinsing stroke and a dehydration stroke by using a double rotor-double stator driving motor and a drum driving device having a planetary gear device

    The washing or rinsing stroke

    Rotating the outer rotor of the driving motor to apply a first input having high speed and low torque to the sun gear of the planetary gear device through a motor shaft;

    When the ring gear of the planetary gear device is fixed or when the RPM of the second input applied to the ring gear is set smaller than the RPM of the first input, the first input applied to the sun gear is decelerated to reduce the speed and high torque characteristics from the carrier. Generating a first output having a; And

    Receiving a first output from the carrier and rotating the drum.
19. The method of claim 18,

    When the decelerated first output is generated from the carrier, when the rotational force in the same direction as the rotational direction of the first input is applied to the ring gear, the RPM of the first output is increased, and the first input to the ring gear is increased. The driving method of the drum washing machine, characterized in that the RPM of the first output is reduced when applying a rotation force in the opposite direction to the rotation direction.
20. The method of claim 18,

    The dehydration stroke

    Rotate the inner rotor of the drive motor to apply a second input to the ring gear of the planetary gear device through the outer shaft rotatably coaxially coupled to the outer circumference of the motor shaft, and at the same time, the sun gear can be freely rotated. Setting or applying the same input to the sun gear as the second input;

    A second input of the inner rotor input to the ring gear generates a second output from a carrier without torque conversion; And

    And receiving a second output from the carrier to rotate the drum.

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