U.S. patent application number 11/491133 was filed with the patent office on 2007-03-08 for operating apparatus and method of a washing machine.
Invention is credited to Cha Seung Jun, Deok Kyu Kim, Byoung Wook Min.
Application Number | 20070050917 11/491133 |
Document ID | / |
Family ID | 37507866 |
Filed Date | 2007-03-08 |
United States Patent
Application |
20070050917 |
Kind Code |
A1 |
Kim; Deok Kyu ; et
al. |
March 8, 2007 |
Operating apparatus and method of a washing machine
Abstract
The operating apparatuses of a washing machine and the methods
on that are renovated. The afore-mentioned washing machine is
including: a memory that the reference signals are saved in order
to operate a motor in a best condition according to each of the
condition of the torque and noise; a control unit which generates
the switching signals as calling the reference signals which are
different each other according to the strokes of a washing machine,
and comparing with the carrier signals; an inverter which generates
a motor operating signal as an external power is switched by a
switching signal; a motor which is rotated by a motor operating
signal; and a revolving screen of a washing machine which is
operated by a motor.
Inventors: |
Kim; Deok Kyu; (Incheon-si,
KR) ; Jun; Cha Seung; (Seoul, KR) ; Min;
Byoung Wook; (Seoul, KR) |
Correspondence
Address: |
MCKENNA LONG & ALDRIDGE LLP;Song K. Jung
1900 K Street, N.W.
Washington
DC
20006
US
|
Family ID: |
37507866 |
Appl. No.: |
11/491133 |
Filed: |
July 24, 2006 |
Current U.S.
Class: |
8/158 ; 68/12.01;
68/12.16 |
Current CPC
Class: |
D06F 34/10 20200201;
D06F 2105/48 20200201; D06F 37/304 20130101; D06F 2103/24
20200201 |
Class at
Publication: |
008/158 ;
068/012.16; 068/012.01 |
International
Class: |
D06F 33/00 20060101
D06F033/00; D06F 35/00 20060101 D06F035/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 5, 2005 |
KR |
10-2005-0082061 |
Claims
1. An operating apparatus of a washing machine comprising; a memory
storing reference signals; a control unit generating switching
signals by calling out the reference signals based on a stroke of a
washing machine and comparing the reference signals with the
carrier signals; an inverter generating motor driving signals by
switching external power source according to the switching signals;
a motor being rotated according to the motor driving signals; and a
rotating body being rotated by the motor.
2. The operating apparatus of claim 1, wherein the reference
signals comprise at least reference signals for driving the motor
in a two-phase mode and reference signals for driving the motor in
a three-phase mode.
3. The operating apparatus claim 2, wherein the reference signals
for driving the motor in the three-phase mode have a sinusoidal
waveform, and the reference signals for driving the motor in the
two-phase mode have a chopped sinusoidal waveform.
4. The operating apparatus of claim 1, wherein the rotating body is
a drum for a washing machine.
5. The operating apparatus of claim 1, wherein the laundering,
rinsing and dehydrate strokes are progressed by the rotating
body.
6. The operating apparatus of claim 1, wherein the motor driving
signals are two-phase or three-phase driving signals being
determined according to the reference signals.
7. The operating apparatus of claim 1, wherein the reference
signals are previously stored as the forms of several look-up
tables.
8. The operating apparatus of claim 1, wherein the reference
signals are called as different signals each other according to the
strokes of the washing machine.
9. The operating apparatus of claim 8, wherein the reference
signals are called that the motor is operated as the three-phase
driving mode in case that a stroke of a washing machine is a
dehydrate stroke.
10. The operating apparatus of claim 8, wherein the reference
signals are called for driving the motor the three-phase mode in
case that the stroke of a washing machine is a laundering and/or
rinsing stroke.
11. A operating method of a washing machine comprising a single
rotating body being able to rotate in high speed and low speed on a
condition that the laundry is contained, and a single motor
rotating the single rotating body, comprising; deciding a rotation
request of the washing machine; driving the single motor in a
three-phase mode for a certain time period in case of the rotation
request in high speed, in order to get a low noise; and driving the
single motor in a two-phase mode for a certain time period in case
of the rotation request in low speed, in order to get a high
torque.
12. The method of claim 11, wherein the washing machine is a drum
washing machine.
13. The method of claim 11, wherein a stroke of the washing machine
is a dehydrate stroke in case that the rotating body is in a high
speed rotation.
14. The method of claim 11, wherein a stroke of the washing machine
is a laundering stroke and/or a rinsing stroke in case that the
rotating body is in a low speed rotation.
15. The method of claim 11, wherein the single motor is driven by
an inverter.
16. The method of claim 15, wherein a switching signal of the
inverter is generated by the SPWM method in case that the rotating
body is rotated in high speed.
17. The method of claim 15, wherein a switching signal of the
inverter is generated by the DPWM method in case that the rotating
body is rotated in low speed.
18. A operating method of a washing machine according a driving
method of a motor, comprising; driving a motor for a certain time
period as a SPWM method to operate a rotating body in case that the
rotating body which contains a laundry is rotated in high speed to
drain the moisture of a laundry; and driving a motor for a certain
time period as a DPWM method to operate a rotating body in case
that the rotating body which contains a laundry and water is
rotated in low speed to remove the dirt on the laundry.
19. A operating method of a washing machine according a rotating
state of a drum, comprising; deciding a stroke being progressed on
a washing machine; deciding a rotating state of the drum based on
the decision of the stroke; calling a reference signal generating a
PWM signal; comparing the reference signal with a carrier signal;
generating the PWM signal based on a result of the comparison and
inputting the PWM signal into the inverter; generating a motor
driving signal using the inverter; and rotating a motor based on
the motor driving signal, wherein the reference signals are
different each other according to the rotating state of the
drum.
20. The operating method of claim 19, wherein the reference signal
being called is suitable for a two-phase driving of a motor when a
drum is rotated in high speed, and the reference signal being
called is suitable for a three-phase driving of a motor when a drum
is rotated in low speed.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to an operating apparatus and
method of a washing machine, more particularly, to an operating
apparatus and method of a washing machine which make a revolving
screen to be rotated in a optimal condition with the movement
condition of a washing machine and a user's taste.
[0003] 2. Description of the Related Art
[0004] A washing machine is, as an apparatus that launders clothes
and etc., recently popularized in every household. This sort of
washing machine includes: a drum washing machine that clothes are
fell by the rotation of a drum, and washed by the shock power
between the laundry and the washing water; pulsator washing machine
that a pulsator is rotated on the bottom of a washing machine, and
the clothes are washed by the shock power between the laundry and
the washing water; an agitator washing machine that a compelled
water current which is generated by an agitator protruded toward
the inside of a laundry tray, and the clothes are washed by the
shock power between the laundry and the washing water. However, it
is certain for all of the afore-mentioned washing machines that the
washing is achieved by a process that a revolving screen which is
applied to a drum, pulsator, or an agitator is rotated by a rotary
power delivered by a motor. Moreover, in case that the functions of
a washing machine and a hydroextractor are adopted in a single
washing machine, the function that the moisture content of a
laundry is drained by a centrifugal force is more progressed as a
drum rotated with a high speed during the dehydration process is
progressed. In recent years, being progressed of the functions of a
washing machine and a hydroextractor in single equipment is
general.
[0005] Under this sort of background, on the afore-mentioned
various kinds of washing machine, when a washing stroke is
progressed, a movement that a drum, pulsator, or an agitator are
rotating towards the right and the opposite direction with a low
speed so as to rotate a washing water or agitate clothes is
accomplished. And, when a dehydration stroke is progressed, a drum
filled with the entire clothes is rotated in one direction with a
high speed, so the centrifugal force is added to the clothes, and
the water is drained by the centrifugal force. As the
above-mentioned, a washing machine is equipment that a high speed
rotation is progressed as well as a low speed rotation is
progressed at the same time.
[0006] On the other hand, it is general that an operating method of
a motor of a washing machine is PWM (Pulse Width Modulation)
control method. On the PWM (Pulse Width Modulation) control method,
the carrier signal of the chopping waves and the reference signal
of the sine waves are input into a comparator, compared together,
and a specific form of the PWM signal output. And the output PWM
signal controls a switching of an inverter, and motor operating
signals which are output from an inverter induce a turning effect
of a motor as input into each of the coils of a motor. And, a PWM
control method changes the rotation speed of a motor according to
the methods that change the frequency of the above-mentioned
chopping waves and the sine waves.
[0007] However, as the conventional PWM signal which is output
according to the comparison of the carrier signal of the chopping
waves and the reference signal of the sine waves has a low
practical use rate of DC-link, can't cope adaptively with washing
processes which needs a high torque. That is, because a lot of
electric power in input DC power isn't used as an electromotive
force, the torque of a motor gets low. For this, make DC input
voltage to be amplified or make the reverse torque to be higher
during the motor design, but as these sorts of structural changes
aren't advisable, because they enlarge the motor size or raise the
manufacturing costs.
SUMMARY OF THE INVENTION
[0008] The present invention is proposed as to improve the
above-mentioned problems, therefore an object of the present
invention is to propose an operating apparatus and method of
washing machine which changes the operating method according to the
movement condition of a washing machine.
[0009] Also, another objects of the present invention is to propose
an operating apparatus and method of washing machine that the
movement of a washing machine is controlled in the optimal
condition according to the proper rotation speed of a rotating body
like a drum of a washing machine, particularly, according to the
rotate condition of a high speed rotation and low speed
rotation.
[0010] Also, another objects of the present invention is to propose
an operating apparatus and method of a washing machine which
make(s) a motor of a washing machine operate in the optimal
condition according to the required torque and the required noise
condition among the various strokes of a washing machine.
[0011] An operating apparatus of washing machine of the present
invention according to an aspect to achieve the above-mentioned
purposes is comprising: a memory which saves the reference signals;
a control part which forms the switching signals as calling out the
reference signals different each other and comparing with the
carrier signals according to the stroke of a washing machine; an
inverter forms the motor operating signals as the external power is
switched according to the switching signals; a motor rotates
according to the motor operating signals; and a revolving screen of
a washing machine operates by a motor.
[0012] The operating method of a washing machine in accordance with
another aspect is characterized by: a single revolving screen that
at least, a high speed rotation and a low speed rotation processes
are progressed in a condition having laundry; a step that the
rotation required condition of a washing machine can be judged on a
washing machine including a single motor rotates a revolving
screen; and in case, that the rotation required condition of a
washing machine is a high speed rotation, a motor is three phase
operated for a specified period to get a lower noise, and in case,
that the rotation required condition of a washing machine is a low
speed rotation, a motor is two phase operated at least for a
specified period to get a higher torque.
[0013] The operating method of a washing machine in accordance with
another aspect is characterized by: in case that a revolving screen
of a washing machine contains the laundry is rotated with a high
speed to dehydrate from the laundry in a condition that the laundry
is contained, at least for a specified period, a motor which
operates a revolving screen operates in SPWM method; and in case
that a revolving screen is rotated with a low speed to remove the
dirt on the laundry in a condition that the laundry and water are
contained, at least for a specified period, a motor is operated in
DPWM method.
[0014] The operating method of a washing machine in accordance with
another aspect is characterized by: a step that a stroke which is
progressed on a washing machine is judged; a step that a rotation
condition of a drum suitable with a judged stroke is judged; a step
that the reference signals which generates PWM signals are called;
a step that reference signals and carrier signals are compared, so
PWM signals are generated and input into an inverter; a step that a
motor operating signals are generated by an inverter; and a step
that a motor is rotated by a motor operating signal is progressed,
and the called reference signals are different according to a
rotation condition of a drum.
[0015] According to the present invention which is proposed, a
motor can be operated in a best suitable condition according to a
stroke of a washing machine, the movement capacity can be improved,
and a user's taste can be promoted.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The abstraction of the present invention can be understood
more clearly by the appended drawings.
[0017] FIG. 1 is a plane diagram of an operating apparatus of a
washing machine in accordance with the present invention.
[0018] FIG. 2 is a flow diagram explaining an operating method of a
washing machine in accordance with the present invention.
[0019] FIG. 3 is a drawing showing an example of a three phase
operating method of a motor in accordance with the present
invention.
[0020] FIG. 4 is a drawing showing an example of a two-phase
operating method of a motor in accordance with the present
invention.
DETAILED DESCRIPTION OF THE INVENTION
[0021] Reference will now be made in detail to the preferred
embodiments of the present invention, examples of which are
illustrated in the accompanying drawings.
[0022] FIG. 1 is a plane diagram of an operating apparatus of a
washing machine in accordance with the present invention.
[0023] As shown in FIG. 1, an operating apparatus of a washing
machine in accordance with the present invention includes: a power
section(1) that the AC power is input; a communication section(2)
which communicates the AC power input through the power section
into a direct current; a smoothing unit(3) which smooth a direct
current communicated on a communication section(2); an inverter(4)
which generates motor operating signals as switching a power to be
smooth into a direct current; a motor(5) which is operated by a n
input power of an inverter.
[0024] Also, includes: a control section(6) which generates
switching signals controls a power of an inverter(4), and input
into an inverter(4); a memory(7) that the information which is
needed for the operations of a control section(6) are saved. As a
distinctive feature of the present invention, at least two kinds of
reference signals are gathered as a form of look up table so as a
proper reference signals to be called by the operation condition of
a motor. For instance, one of the reference signals is the No. 1
look-up table which is needed for a two-phase operating of a motor,
and another is the No. 2 look-up table which is needed for a
three-phase of a motor. The reference signals form switching
signals which are needed for the operations of an inverter(4) as
compared with carrier signals is already mentioned.
[0025] And, PWM signals formed by an inverter is input into a
motor(5), and used as operation signals of a motor.
[0026] The operating method of a washing machine in accordance with
the present invention as based on the operating apparatus of a
washing machine as the same with the proposal is briefly
explained.
[0027] First, the various strokes which are progressed on a washing
machine includes: a stroke which needs a rotation of a motor; and a
stroke which doesn't need a rotation of a motor. For instance, a
stroke which needs a rotation of a motor are a stroke that a drum,
pulsator, and an agitator are rotated during the laundering,
rinsing out, dehydrating stokes; and a stroke which doesn't need a
rotation of a motor are the water supplying, and the draining
strokes. It is judge if the stroke which is about to be progressed
is a high speed rotation, or a low speed rotation if the stroke is
a stroke which needs a rotation of a motor among the
afore-mentioned strokes. A high speed stroke and A low speed stroke
can be previously decided by the operating condition, for instance,
laundering and rinsing can be a low speed stroke, and a dehydrate
stroke can be a high speed stroke.
[0028] If a high speed rotation stroke is progressed, a motor is
operated as three phase. On the three-phase operating of a motor on
a high speed rotation stroke, generally as comparatively a lot of
noise is generated if a motor is rotated in a high speed, even if
the torque is low, a motor is operated as a three-phase operating
method that little noise is generated. Differently with this, in
case that a low speed rotation stroke is progressed, a motor is
operating as two-phase. On a low speed stroke, a motor is operating
as two-phase, because generally, in case that a motor is rotated
with a low speed, as a condition that clothes and water are
contained in the inner side of a drum like the laundering stroke,
the conversion of the rotation direction of a motor is frequent and
a lot of resistance is inflicted to the rotation of a motor.
Therefore, a motor is operated as two-phase that the torque is
strong on a low speed rotation stroke. Even though a little noise
is generated when a motor is two-phase operated, it doesn't give
any unpleasant feeling to a user as being absorbed into the noise
generated during the agitating of clothes.
[0029] The above-explained two-phase operating method and three
phase operating method of a motor will be explained more
particularly on the followings.
[0030] Continually, after an end of a stroke of a washing machine,
the next stroke is decided; an two-phase operating method is
applied if it is a low speed rotation stroke, three-phase operating
method is applied if it is a high speed rotation stroke, and the
next operation stroke of a washing machine is progressed.
[0031] On the other hand, a data which is necessary for two-phase
operating method and three-phase operating method of a motor is
used as the information are called which is saved on a memory(7);
when two-phase operating method is applied, the No. 1 look-up table
is called and used as a reference signal; when three-phase
operating method is applied, the No. 2 look-up table is called and
used as a reference signal. Also, the information of the called
look-up table compared with the carrier signal by a control
section(6), and the signals out put after the comparison is used as
a switching signal as being input into an inverter(4).
[0032] The operating method of a washing machine like the
above-explained can be understand according to a flow diagram
explains the operating method of a washing machine presented on the
drawing 2.
[0033] As explain the operating method of a washing machine
particularly as referring to the drawing 2: first, the motor
operating if it will be operated is decided(St 1). The motor
operating steps are divided, as a step that a laundering stroke,
rinsing stroke, and a dehydrating stroke are progressed directly,
and as a step that a drum, a pulsator, and an agitator are rotated
for laundering, into a stroke that a motor is rotated with a low
speed for laundering stroke and rinsing stroke, and a stroke that a
motor is rotated with a high speed for dehydrating stroke.
[0034] Next, a step if a motor is rotated with a high speed is
decided(St 2), in case which decided as a high speed rotation mode,
a motor is progressed as a three-phase operating step(St 3), in
case which decided as a low speed rotation mode, a motor is
progressed as a two-phase operating step(St 4).
[0035] Whether it's a step that a motor rotates with a high speed
can be previously decided according to the series of a stroke
condition which is previously saved on a memory according to the
progress condition of a washing machine.
[0036] Being changed an operating method of a motor according to
the strokes of a washing machine is a work that a washing machine
to be operated with a best torque and noise condition according to
a stroke of a washing machine. Particularly, a high torque is
generated, because the DC-link application rate of a motor is high
near 100% in a two-phase operating condition of a motor so a high
torque is generated, but a lot of harmonics is generated, so a lot
of noise is generated during the operating. And in the condition
that a motor is three-phase operating method, compared with
two-phase operating me condition, application rate of a DC-link is
low as about 87%, the torque is low, but the little harmonics are
generated, so it can be suitably applied when a low noise operating
is required.
[0037] FIG. 3 is a drawing showing an example of a three phase
operating method of a motor, and FIG. 4 is a drawing showing an
example of a two-phase operating method of a motor. Three phase
operating method is embodied by SPWM: Sinusoidal Pulse Width
Modulation, a two-phase operating method is embodied by DPWM:
Dead-band sinusoidal Pulse Width Modulation.
[0038] As refer to FIG. 3 to 4, the (a) of FIG. 3 and the (a) of
FIG. 4 are as drawings illustrated an alteration condition of
carrier signals(11)(21) and reference signals(21)(22), illustrating
at least one part of the carrier signals of the chopping waves and
reference signals of sine waves are compared each other. The
line-to-neutral switching pattern which is output after the two
signals are compared by a comparator is illustrated as the (b) of
FIG. 3 and the (b) of FIG. 4. And, the (c) of FIG. 3 and the (c) of
FIG. 4 are drawings that the signals of the (b) of FIG. 3 and the
(b) of FIG. 4 are on the condition frequency analyzed as a
frequency domain as fourier converted.
[0039] As referring to the (b) of FIG. 3 and the (b) of FIG. 4, the
carrier signals(11)(21) are the same, on the comparison of the
reference signals(12)(22); reference signals(12) are continued
chopping waves, but on SPWM, the reference signals(22) are
discontinued chopping waves, and No signals exist in the period of
120 in between 0 degree and 360 degree. Therefore, PWM altered
operating signals are continually input into the entire of the
three phase of a motor(5) on SPWM, but (ON) signal which isn't
altered according to the carrier signals(21) are input through a
phase which is altered with the intervals of 120.degree. on DPWM.
For DPWM, because the reference signals(22) aren't able to be input
on 120.degree., this section is called as Dead-band. According to
these method, the altered motor operating signals are input only
into the two phases on DPWM, and because of this, DPWM is always
operated with two phase operating method.
[0040] Also, as referring to the (c) of FIG. 3 and the (c) of FIG.
4, the two-phase operating method, compared with the three-phase
operating method, generates more harmonics, and a lot of noise is
generated during the operating of a motor by the harmonics.
[0041] Each of the (d) of FIG. 3 and the (d) of FIG. 4 are
illustrating the output wavy pattern between a line and a line on
the SPWM method and the DPWM method, and the (e) of FIG. 3 and the
(e) of FIG. 4 are drawings of a condition that the (d) of FIG. 3
and the (d) of FIG. 4 signals are fourier altered frequency
analyzed as a frequency domain.
[0042] As referring to the (d) of FIG. 3 and the (d) of FIG. 4,
DC-link application rate of the DPWM method is higher, compared
with SPWM method, as the Duty-on section is enlarged, hereby, a
high torque is generated on the two-phase operating that the DPWM
method is applied is noticed easily.
[0043] As referring to the (e) of FIG. 3 and the (e) of FIG. 4, the
DPWM method, compared with SPWM method, generates more harmonics,
hereby, it is easily noticed that more noise is generated on the
two-phase operating method that DPWM method is applied.
[0044] Explained motor operating method can be applied differently
each other according to the strokes of a washing machine. As
explain particularly, applying two-phase operating method of a
motor which is operated as DPWM method is suitable on a washing
stroke or a rinsing stroke that a high torque is required among the
operating strokes of a washing machine. It is suitable because,
though the noise in a measure is generated, a high torque is
obtained. Also, it is suitable because, though the noise is
generated on a motor, giving a user an unpleasant feeling is very
rare, because it is mixed with the noise during the agitating of
the laundry like clothes. Also, even though a laundry stroke and a
rinsing stroke rotate with a low speed, because a sudden change of
the rotate direction is frequent, a two-phase operating method
which operates with DPWM method that a high torque is generated is
more suitable.
[0045] Also, on the dehydrate stroke which is rotated with a high
speed among the operating strokes, the three-phase operating method
which is operated as SPWM method is suitable, because a low
noise
[0046] operating condition can be obtained even though a torque is
low. Also, on the dehydrate stroke, the rotate direction isn't
changed continually though it is rotated with a high speed, as a
high torque isn't required on the rotating condition, and able to
obtain the enough power with a low torque, so three-phase operating
method of SPWM method of a motor is more suitable.
[0047] As referring FIG. 2 again: if the two-phase operating of a
motor is progressed(St 5) as decided to a low speed rotation
mode(St 2);
[0048] first, the No. 1 look-up table is called on the memory(7)(St
6); on a control section(6), the switching signals are generated
after comparing the reference signals of the No. 1 look-up table
and carrier signals(St 7). And, the switching signals are used as
switching signals of inverter(4); and direct motor operating
signals are generated on the inverter(4); supplied to a motor(5)
and a motor is rotated(St 8).
[0049] Also, on a high speed rotation mode decision step(St 2); if
the three-phase operating is progressed as decided it isn't a high
speed rotation mode(St 3); first, the No. 2 look-up table is
called(St 6); on a control section(6), the switching signals are
generated after comparing the reference signals of the No. 2
look-up table and carrier signals(St 7). And, the switching signals
are used as switching signals of inverter(4); motor operating
signals are generated on the inverter(4); supplied to a motor(5)
and a motor is rotated(St 8).
[0050] According to the proposed present invention, especially,
when a stroke like a dehydrate stroke which is required of a low
noise-conditioned driving is progressed; as a motor is three-phase
operated with a SPWM method, a washing machine is able to be
operated in a required low noise condition though the torque is
low.
[0051] And, especially when a laundering stroke or a rinsing stroke
that a high torque driving is required is progressed; as a motor to
be two-phase operated with DPWM method, a washing machine is able
to be operated in a required high torque condition though the noise
in a measure is generated.
[0052] As explained, according to an operating method of a washing
machine in accordance with the present invention: without an
addition of a complex hardware-like composing, only saving the two
kinds of look-up tables on a memory(7), two-phase operating method
according to the DPWM method; an embodiment of the three-phase
operating method of a motor according to the SPWM method are
possible.
[0053] Therefore, without additional circuits or a additional
consumption of the costs, the operating method of a washing machine
can be adaptable by the strokes of a washing machine.
[0054] The preferred embodiment as proposed of the present
invention is able to have more different embodiments to be changed
in the extent of the original abstraction, the changeable
embodiments are explained on the following.
[0055] First, the main abstraction of the present invention is
making a motor of a washing machine to be rotated by the operating
condition,--that is, a laundering and a rinsing strokes which is
required a high torque and the require condition of the noise is
low, and a dehydrate stroke which is required a low noise and the
require condition of the torque--and different methods. As the
operation of a washing machine is progressed like this, the
satisfaction of a user by a low noise classified by the operations
of a washing machine is raised, operation stability is obtained of
a washing machine according to the high torque, laundering
efficiency is improved. Also, without hardware-like additional
composing, as only adding a small number of information-for
instance, several number of look-up table-applied differently to
the number and kinds of a phase capable of operating of a motor on
a memory, the effect can be achieved, the manufacturing costs are
decreased.
[0056] Also, the reference signals and carrier signals which is
used on the DPWM method aren't limited by the above-mentioned, the
various forms of the associated signals are able to be used.
However, a motor is operated as two-phase as the dead regions are
formed with certain internals on the DPWM method. As well as on the
three-phase operating method of a motor, the various kinds of
reference signals and carrier signals are able to be used.
Furthermore, according to an operation method, the operation method
of a motor which is able to be proposed as various forms, compare
with a case that the high torque is required, in case that a low
noise is required, being added an operating method has more phases
is desirable.
[0057] Also, as another example, when a certain stroke is
progressed according to the strokes of a washing machine, for a
motor being operated as two-phase of a certain section and being
operated as three-phase of a certain section possible, and this is
included on the extent of the present invention. However,
desirably, entirely only the two-phase is operated when the
two-phase operating, and entirely only the three-phase is operated
when the three-phase operating are desirable.
[0058] Also, in the equipment aspect, it is possible that the two
of look-up tables are saved and called when it is needed according
to a motor operating method, but several numbers of look-up tables
on a washing machine are saved according to the progress condition
of the continued strokes, it is possible that more suitable look-up
tables are called and used according to the needs. Also, it is
possible that a reference signal is able to be formed at every
moment when it is needed by an arithmetical method not by the
method that the tables are saved on the memory. it is more
desirable that a reference signal is able to be formed at every
moment when it is needed.
[0059] Also, the present invention, on the various forms of a
washing machine, is able to be applied to the various revolving
screen like a drum, pulsator, and an agitator, more desirably,
because it isn't influenced by the amount, so the fullness of
revolving screen is applied comparatively to be identified.
[0060] According to the proposed present invention, because the
operating method of an inverter and a motor is different, the
operating of a washing machine appropriated by the special quality
of the strokes can be operated.
[0061] Also, because the two-phase and three-phase of a motor is
selectively applied according to the noise condition and the proper
rotation speed of a revolving screen like a drum of a washing
machine, especially, a low noise driving is possible during the
dehydrating and a high torque driving is possible during the
laundering and rinsing.
[0062] Also, several reference signals of only being saved on the
memory installed conventionally for the individual movement of an
inverter, the operating condition of a washing machine is able to
be operated as a user's desire, so the additional composition isn't
needed as well as the costs for that isn't consumed.
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