KR20130076183A - Motor drive apparatus for washing machine and driving method thereof - Google Patents

Abstract

PURPOSE: A motor driving device for a laundry machine and a driving method thereof are provided to control the RPM and torque of the motor according to washing, rinsing, or spin mode by controlling the connection of U-phase stator coils, V-phase stator coils, and W-phase stator coils. CONSTITUTION: A motor control part (100) generates driving signals according to laundry control signals and generates connection control signals according to washing, rinsing, or spin mode. An inverter (120) switches DC power to AC power according to the driving signals. A brushless DC (BLDC) motor (130) for a laundry machine is driven by the AC power. A connection control part (140) controls the connection of multiple stator coils arranged in the BLDC motor according to the connection control signals. [Reference numerals] (100) Motor control part; (110) Gate driver; (120) Inverter; (140) Connection control part; (AA) Signal for controlling washing

Description

Driving device and driving method for a washing machine motor {MOTOR DRIVE APPARATUS FOR WASHING MACHINE AND DRIVING METHOD THEREOF}

The present invention relates to a driving apparatus and a driving method of a motor for a washing machine. More specifically, according to the washing mode, the rinsing mode, and the dehydration mode, the connection state of the U-phase, V-phase, and W-phase stator coils wound on the stator of the washing machine BLDC motor is adjusted. Low RPM) and high torque (High Torque), and in the dehydration mode relates to a driving device and a driving method of a motor for a washing machine for implementing a high RPM (High RPM) and a low output (Low Torque).

In general, a drum washing machine in which the driving shaft is horizontally rotates a rotating structure such as a drum or a basket disposed horizontally in the tub by the power of a washing machine motor. In addition, the automatic washing machines having the driving shaft installed vertically rotate the rotating structure such as the washing tub and the pulsator by the power of the washing machine motor disposed below.

The washing machines typically transmit the rotational force of the washing machine motor indirectly to the rotating shaft of the rotating structure through a belt or the like, or the rotating force of the washing machine motor is directly transmitted to the rotating shaft of the rotating structure.

The washing machine motor is composed of a stator and a rotor rotatably installed at a predetermined interval in a central portion of the stator.

The stator has a stator core in which a plurality of T-shaped teeth protrude radially while forming a slot between each of the plurality of T-shaped teeth while maintaining a predetermined interval in an annular yoke having a predetermined curvature, and the plurality of T-shaped. It consists of a plurality of stator coils wound on the tooth.

In general, the number of teeth (number of slots) and the number of poles (number of poles of N and S poles) wound on the stator coil of a washing machine motor are set in proportion to each other. The motor for washing shows high torque and low speed characteristics, and when the number of teeth is small, the washing machine motor shows low torque and high speed characteristics.

Meanwhile, the washing machine can be largely divided into a washing mode, a rinsing mode, and a spinning mode.

The washing mode and the rinsing mode require a low RPM and a high torque, and the dehydration mode requires a high RPM and a low torque.

That is, it is preferable that the number of teeth of the washing machine motor is large in the washing mode and the rinsing mode, and that the number of teeth of the washing machine motor is small in the dehydration mode.

However, the washing mode and the rinsing mode and the dehydration mode require characteristics opposite to each other, and a stator having a structure in which one washing machine motor satisfies both the washing mode and the rinsing mode and the characteristics required in the dehydration mode (teeth) Cannot be designed.

Typically, a washing machine motor is designed to be suitable for low speed and high torque in a washing mode and a rinsing mode by using a concentrated winding method of winding a coil on a tooth provided in a stator core. It is a cause of deterioration.

In addition, the washing machine has a much longer operation time than the washing mode and the rinsing mode operation time.

Therefore, the washing machine motor is designed to optimize the high torque and low speed characteristics by designing a large number of teeth provided in the stator so that it is suitable for the washing mode, and performs field weakening control in the dehydration mode requiring low torque and high speed characteristics. have.

For example, in Korean Patent Laid-Open Publication No. 2004-68224, a washing machine motor is controlled to operate as an electric field in a low-speed rotation region of the washing mode, and a washing machine motor is controlled to operate as a weak- In addition, the output torque of the motor for washing machine is vector-controlled when electric field operation is performed, and the output torque of the motor for washing machine is subjected to voltage phase control when weak field operation is performed.

However, the above-mentioned weak field control requires a very complicated control circuit and a control routine, and also has a problem that the driving efficiency of a motor for a washing machine can not be maximized.

In the case of designing the washing machine motor considering only one of the washing mode and the dehydrating mode as described above, since the driving efficiency of the washing machine motor can not be optimized on the whole, the torque value required in the washing mode, It is generally designed to be designed at an intermediate stage in consideration of the rotational speed of the washing machine motor. As a result, there is a problem that a motor for a washing machine having a maximum efficiency in the washing mode and the rinsing mode can not be designed.

In order to increase energy efficiency, brushless DC (BLDC) motors controlled by inverters are increasingly used in home appliances such as air conditioners, washing machines, and refrigerators.

The BLDC motor is also referred to as a commutatorless motor. Instead of using brushes and commutators, which are important components of a DC motor, a BLDC motor generates a rotating magnetic field while switching a current flowing to a stator coil by switching a power switching element such as a transistor Rotate the rotor.

Accordingly, the BLDC motor has a current-to-torque characteristic and a speed-to-voltage characteristic similar to those of a direct current motor in the structure of a synchronous motor, and its field of application is continuously expanding from household appliances to industrial appliances due to high efficiency and high power density Trend.

Such a BLDC motor is disposed so that the three stator coils have an electrical phase difference of 120 ° in a three-phase driving manner in opposition to the permanent magnet of the rotor, and when the stator coils selectively energize each phase through a switching element. Accordingly, the rotor is rotated by magnetic forces acting on the magnetic poles of the teeth selectively magnetized and the magnetic poles of the permanent magnets provided in the rotor.

Three-phase BLDC motor is easier to control torque than single-phase BLDC motor, has high efficiency, and is advantageous in terms of noise. Therefore, large-capacity BLDC motor is mostly driven by three-phase (U-phase, V-phase, W-phase) AC power. I use it.

The motor driving apparatus for driving the three-phase BLDC motor includes three pairs of power switching elements such as a field effect transistor (FET) and an insulated gate bi-polar transistor (IGBT) A large number of voltage-type inverters are used.

That is, the three-phase BLDC motor, unlike the AC motor, selectively switches three pairs of switching transistors connected to a totem pole to generate three-phase AC power of U phase, V phase, and W phase, and generates three-phase AC power into U phase, By sequentially applying to the stator coils of the V phase and the W phase, the stator coils of each phase are sequentially excited to generate a rotating magnetic field to allow the rotation of the rotor.

However, as described above, the conventional washing machine motor has a structural limitation that cannot satisfy both the washing mode and the rinsing mode and the dehydration mode. To overcome this, the so-called field weakening control is applied for the high-speed rotation in the dehydration mode. Weak field control requires very complicated control circuits and control routines, and there is a problem in that motor efficiency cannot be maximized.

Further, in the case where complicated weak field control is not selected, since the washing machine motor can not satisfy both the washing mode and the rinsing mode and the dehydration mode, it is generally designed as an intermediate stage considering both the washing mode and the rinsing mode and the dehydration mode shall. Therefore, there is a demand for designing a motor for a washing machine which can have an optimum efficiency in each of the washing mode, the rinsing mode, and the dehydration modes.

Korean Laid-Open Patent Publication No. 2004-68224

The problem to be solved by the present invention is the connection state of a plurality of U-phase stator coils, a plurality of V-phase stator coils and a plurality of W-phase stator coils wound on a plurality of teeth, depending on the washing mode and rinsing mode and dehydration mode By adjusting the, implements a low speed and high torque in the washing mode and rinsing mode, and provides a driving device and a driving method of the motor for a washing machine to implement high speed and low torque in the dehydration mode.

In addition, the problem to be solved by the present invention implements a low speed and high torque by connecting a plurality of U-phase stator coils, a plurality of V-phase stator coils and a plurality of W-phase stator coils in series when performing the washing mode and the rinsing mode It provides a driving device and a driving method of the washing machine motor.

In addition, the problem to be solved by the present invention is to divide the plurality of U-phase stator coils, the plurality of V-phase stator coils and the plurality of W-phase stator coils evenly when performing the dehydration mode, divided U-phase stator coils The present invention provides a driving apparatus and a driving method of a motor for a washing machine that implements high speed and low torque by connecting each of the V phase stator coils and the W phase stator coils in parallel.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. There will be.

According to the driving apparatus and driving method of the washing machine motor of the present invention, when performing the washing mode or the rinsing mode, a plurality of U-phase stator coils, a plurality of V-phase stator coils and a plurality of Low-speed and high torque is realized by adjusting the W-phase stator coil in series connection.

In the dehydration mode, the plurality of U-phase stator coils, the plurality of V-phase stator coils, and the plurality of W-phase stator coils included in the BLDC motor for the washing machine are divided equally, and the plurality of divided U-phase stators are divided. The coil, the plurality of V-phase stator coils and the plurality of W-phase stator coils are adjusted in parallel to realize high speed and low torque.

Therefore, the driving apparatus of the washing machine motor of the present invention, the motor control unit for generating a driving signal in accordance with the washing control signal and the connection control signal generated in the washing mode, the rinsing mode and the dehydration mode, and the direct current in accordance with the drive signal Connection of an inverter that generates AC power by switching electric power, a BLDC motor for a washing machine driven according to the AC power generated by the inverter, and a plurality of stator coils provided in the BLDC motor for the washing machine according to the connection state control signal. It characterized in that it comprises a connection state control unit for adjusting the state in series connection or parallel connection.

In addition, the driving method of the washing machine motor of the present invention, the motor control unit by the washing control signal to determine whether the washing mode, rinsing mode or dehydration mode, and when the determination result in the washing mode or rinsing mode motor The controller controls the connection state adjusting unit to serially connect a plurality of stator coils of the washing machine motor and generate a driving signal according to the washing control signal to drive the washing machine BLDC motor. And connecting the plurality of stator coils of the BLDC motor for a washing machine in parallel by controlling the connection state adjusting unit and generating a driving signal according to the washing control signal to drive the washing machine BLDC motor. .

According to the driving device and the driving method of the washing machine motor of the present invention, when performing the washing mode and the rinsing mode, a plurality of U-phase stator coils, a plurality of V-phase stator coils and a plurality of W provided in the BLDC motor for a washing machine Phase stator coils are controlled in series to achieve low speed and high torque.

When the dehydration mode is performed, the plurality of U-phase stator coils, the plurality of V-phase stator coils, and the plurality of W-phase stator coils included in the BLDC motor for the washing machine are divided equally, and the divided U-phase stator coils are divided. In addition, a plurality of V-phase stator coils and a plurality of W-phase stator coils are adjusted in parallel to realize high speed and low torque.

Therefore, according to the present invention, the motor for the washing machine is designed and manufactured to be suitable for the washing mode and the rinsing mode to realize high torque and low speed, and when the dehydration mode is performed, the motor for the washing machine is not controlled. High speed and low torque can be realized by switching the stator coil's wiring state in parallel.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, which do not limit the present invention, and like reference numerals designate like elements in some drawings.
1 is a block diagram showing the configuration of an embodiment of a drive device for a washing machine motor of the present invention;
Figure 2 is a view for laying out the structure of the stator in the drive device for a washing machine motor of the present invention,
Figure 3 is a view showing the configuration of a preferred embodiment of the connection state control unit in the drive of the washing machine motor of the present invention,
4 is a view showing a series connection state of the connection state control unit in the driving apparatus of the washing machine motor of the present invention,
5 is a view showing an embodiment of a parallel connection state of the connection state control unit in the driving apparatus of the washing machine motor of the present invention,
6 is a graph showing a relationship between torque and RPM of a washing machine motor according to a series connection state and a parallel connection state in a driving apparatus of a washing machine motor according to the present invention;
7 and 8 are graphs showing the curve of the rotational speed-torque of the washing machine motor according to the series connection state and the parallel connection state in the driving apparatus of the washing machine motor according to the present invention;
9 is a view showing another embodiment of a parallel connection state of the connection state control unit in the driving apparatus of the washing machine motor of the present invention,
10 is a view showing another embodiment of a parallel connection state of the connection state control unit in the driving apparatus of the washing machine motor of the present invention, and
11 is a control flowchart illustrating a method of driving a washing machine motor according to the present invention.

The following detailed description is only illustrative, and merely illustrates embodiments of the present invention. In addition, the principles and concepts of the present invention are provided for the purpose of explanation and most useful.

Accordingly, it is not intended to provide a more detailed structure than is necessary for a basic understanding of the present invention, but it should be understood by those skilled in the art that various forms that can be practiced in the present invention are illustrated in the drawings.

1 is a block diagram showing the configuration of an embodiment of a driving device of a BLDC motor for a washing machine of the present invention. Here, reference numeral 100 denotes a motor controller. The motor control unit 100 determines a washing mode, a rinsing mode and a dehydration mode according to a washing control signal input from an external washing machine control main control unit (not shown in the drawing), and determines the washing mode, the rinsing mode, and the dehydration. The drive signal is generated depending on the mode and the wiring control signal is generated at the same time.

For example, the motor controller 110 generates a pulse width modulation (PWM) driving signal for driving the BLDC motor 100 for the washing machine.

Reference numeral 110 is a gate driver. The gate driver 110 amplifies a driving signal generated by the motor controller 100.

Reference numeral 120 is an inverter. The inverter 120 generates a three-phase AC power by switching a plurality of switching elements in accordance with the drive signal amplified by the gate driver 110. For example, in the inverter, three pairs of switching elements are connected in a totem pole structure between a power supply terminal and ground, and switched according to the driving signal, thereby generating three-phase AC power at the connection point of the three pairs of switching elements.

Reference numeral 130 denotes a BLDC motor for a washing machine. The washing machine BLDC motor 130 is driven according to the three-phase AC power generated by the inverter 120.

For example, the washing machine BLDC motor 130 may be configured by combining a stator 200 having an integrated core 210 and a rotor 300 having an inner rotor type structure as shown in FIG. 2. The integral core 210 has a structure in which a plurality of, for example, 18 teeth 211 are extended inside the annular back yoke 212, and the 18 teeth 211 are insulated from coils wound thereon. For the bobbin 220 made of an insulating material is formed integrally. Each of the eighteen teeth 211 is wound with U phase stator coils U1 to U6, V phase stator coils V1 to V6, and W phase stator coils W1 to W6.

The rotor 300 has a structure in which the permanent magnets 322 of the N pole and the S pole are alternately mounted on the outer circumference of the back yoke 321. The rotating shaft 400 is coupled to the center of the back yoke 321.

However, the BLDC motor to which the present invention is applied can also be applied to an outer rotor structure or a double rotor structure, and of course, a stator having an integral core as well as a stator having a split core can be combined with the rotor.

Reference numeral 140 denotes a connection state control unit. The connection state control unit 140 may control the U-phase stator coils U1 to U6, the V-phase stator coils V1 to V6, and the W-phase stator coils W1 to W6 under the control of the motor controller 100. Adjust the wiring.

For example, as shown in FIG. 3, the connection state control unit 140 includes the U-phase stator coils U3 and U4, the V-phase stator coils V3 and V4, and the W-phase stator coils W3 and W4. In between, U-phase stator coils U3 and U4 and V-phase stators are provided with switching switches SW11 and SW12 (SW21 and SW22) (SW31 and SW32) respectively switched under the control of the motor control unit 130. The coils V3 and V4 and the W-phase stator coils W3 and W4 are connected to the movable terminals of the switching switches SW11 and SW12 (SW21 and SW22) (SW31 and SW32, respectively) and the switching switches SW11 and SW12 ( One fixed terminal a11, a12, a21, a22, a31, a32 of SW21, SW22 (SW31, SW32) are connected to each other, and the selector switch SW11, SW12 (SW21, SW22) (SW31, SW32). The other fixed terminal (b11) (b21) (b31) of) is connected to the neutral point 300, and the other fixed terminal (b12) (b22) (b32) is connected to the U phase, V phase and W phase terminals, respectively, and switched. U phase stay according to switching of switches SW11 and SW12 (SW21 and SW22) (SW31 and SW32) The coils U1 to U3 (U4 to U6), the V phase stator coils V1 to V3 (V4 to V6) and the W phase stator coils W1 to W3 (W4 to W6) are configured to be connected in series or in parallel. .

The switching switches SW11 and SW12 (SW21 and SW22) (SW31 and SW32) may be configured as a relay or a switching transistor.

The driving apparatus of the washing machine motor of the present invention having such a configuration determines whether the motor controller 130 performs the washing mode, the rinsing mode, and the dehydration mode by using the washing control signal input from the outside.

When it is determined that the washing mode or the rinsing mode should be performed, the motor control unit 100 switches the switching switches SW11 and SW12 (SW21 and SW22) (SW31 and SW32) of the connection state control unit 140 to operate the terminal. Is connected to one of the fixed terminals a11 and a12 (a21 and a22) (a31 and a32).

Then, as shown in FIG. 4, the U-phase stator coils U1-U3 (U4-U6), the V-phase stator coils V1-V3 (V4-V6), and the W-phase stator coils W1-W3 (W4). ˜W6) are connected in series via changeover switches SW11, SW12 (SW21, SW22) (SW31, SW32).

In this state, the motor controller 100 generates a PWM driving signal having a predetermined frequency for performing the washing or rinsing operation according to the washing control signal, and the generated PWM driving signal is amplified by the gate driver 110 and then inverter Is applied to 120.

Then, the inverter 120 is switched according to the PWM driving signal to generate three-phase AC power, the generated three-phase AC power is applied to the washing machine motor 130 is driven washing machine motor 130 is driven or washed or rinsed Perform the action.

In the present invention, when the washing mode or the rinsing mode is performed, the connection state adjusting unit 140 performs the U-phase stator coils U1 to U6 and the V-phase stator coils V1 to V1 according to the control of the motor controller 100. V6) and the W-phase stator coils W1 to W6 are connected in series.

Therefore, the number of teeth (number of slots) in which the U-phase stator coils U1 to U6, the V-phase stator coils V1 to V6, and the W-phase stator coils W1 to W6 are wound is 6, resulting in low speed and high torque. While implementing the washing operation and the rinsing operation can be performed.

When the dehydration mode is performed, the motor controller 100 switches the switching switches SW11 and SW12 (SW21 and SW22) (SW31 and SW32) of the connection state control unit 140 to fix the movable terminal to the other side. Terminals b11 and b12 (b21 and b22) and b31 and b32.

Then, as shown in Fig. 5, the U-phase, V-phase and W-phase stator coils U3, V3, and W3 are connected to the neutral point through the switch SW11, SW21, and SW31, and the U-phase, The V-phase and W-phase stator coils U4 (V4) and W4 are connected to the U-phase, V-phase and W-phase terminals via the changeover switch SW12, SW22, and SW32, and the U-phase stator coils U1 to U3. ) U4 to U6, V phase stator coils V1 to V3, V4 to V6, and W phase stator coils W1 to W3 and W4 to W6 are connected in parallel.

In this state, the motor controller 100 generates a PWM driving signal having a predetermined frequency for performing the dehydration operation according to the washing control signal, and the generated PWM driving signal is amplified by the gate driver 110 and then the inverter 120. ) Is applied to generate three-phase AC power, and the generated three-phase AC power is applied to the washing machine motor 130 to drive the washing machine motor 130 to perform a dehydration operation.

According to the present invention, when the dehydration mode is performed, the connection state control unit 140 performs the U-phase stator coils U1 to U3 (U4 to U6) and the V-phase stator coils under the control of the motor controller 100. V1 to V3) (V4 to V6) and W phase stator coils W1 to W3 (W4 to W6) are connected in parallel, respectively.

Therefore, each of the U phase stator coils U1 to U3 (U4 to U6), the V phase stator coils V1 to V3 (V4 to V6) and the W phase stator coils W1 to W3 (W4 to W6) are connected in series. As the number of the wound teeth (the number of slots) is three, the resistance to the stator coils of each phase is reduced to 1/4 so that dehydration can be performed while implementing high speed and low torque.

6 is a graph showing a relationship between torque and RPM of a washing machine motor according to a series connection state and a parallel connection state in a driving apparatus of a washing machine motor according to the present invention. Referring to FIG. 8, the rotational speed of the washing machine motor 110 is increased more than twice in the case of the parallel connection state, and the torque is higher than the case of the parallel connection state in the case of the parallel connection state. It can be seen that it is obtained.

As a result, in the present invention, the washing machine motor 130 can easily approach the required high speed rotation speed without performing field weakening control in the dehydration mode.

7 and 8 are graphs showing the curve of the rotational speed-torque of the washing machine motor according to the series connection state and the parallel connection state in the driving device of the washing machine motor according to the present invention. 7 and 8, RPM (■), power (▲) is higher than when the parallel connection state is a series connection state, efficiency (◆) is more than when the parallel connection state when a series connection state. It can be seen that high.

Meanwhile, in the above operation, when the dehydration mode is performed, the U phase stator coils U1 to U6, the V phase stator coils V1 to V6, and the W phase stator coils W1 to W6 are divided into two and connected in parallel. An example has been described.

In the present invention, the present invention is not limited thereto, and the connection state of the U phase stator coils U1 to U6, the V phase stator coils V1 to V6, and the W phase stator coils W1 to W6 can be adjusted in various ways.

For example, when performing the operation in the dehydration mode, as shown in Fig. 9, the U-phase stator coils U1 and U2 (U3 and U4) (U5 and U6) and the V-phase stator coils V1 and V2 ( Each of the V3 and V4 (V5 and V6) and the W-phase stator coils W1 and W2 (W3 and W4) (W5 and W6) may be divided into two and connected in parallel, or illustrated in FIG. 10. As described above, the U-phase stator coils (U1 to U6), the V-phase stator coils (V1 to V6), and the W-phase stator coils (W1 to W6) can all be divided and connected in parallel. Can be adjusted.

11 is a control flowchart illustrating a method of driving a washing machine motor according to the present invention. Referring to FIG. 11, the motor control unit 100 inputs a washing control signal from an external washing machine control unit (S400), and determines whether to perform a washing mode, a rinsing mode, or a dehydration mode through the input washing control signal. It determines (S402, S404).

When it is determined that the washing mode or the rinsing mode is to be performed, the motor control unit 100 controls the connection state adjusting unit 140 to control the plurality of U-phase stator coils U1 to U provided in the washing machine motor 130. U6), the plurality of V-phase stator coils V1 to V6 and the plurality of W-phase stator coils W1 to W6 are respectively connected in series (S406). For example, as shown in FIG. 4, the U-phase stator coils U1 to U6, the V-phase stator coils V1 to V6, and the W-phase stator coils W1 to W6 are connected in series.

The motor control unit 100 generates a driving signal according to the washing mode or the rinsing mode to perform the washing operation or the rinsing operation (S408).

When it is determined in step S404 that the dehydration mode should be performed, the motor control unit 100 controls the connection state control unit 140 to control the plurality of U-phase stator coils provided in the washing machine motor 130 ( U1 to U6), the plurality of V-phase stator coils V1 to V6 and the plurality of W-phase stator coils W1 to W6 are respectively connected in parallel (S410). For example, as shown in FIG. 5, the plurality of U-phase stator coils U1 to U6, the plurality of V-phase stator coils V1 to V6, and the plurality of W-phase stator coils W1 to W6 are divided into two. In parallel.

The motor controller 100 generates a driving signal according to the dehydration mode to perform the dehydration operation (S412).

The present invention has been described in detail with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. Will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

According to the present invention, according to the washing mode, the rinsing mode, and the dehydration mode, the connection state of the U phase, V phase, and W phase stator coils wound on the stator of the BLDC motor for a washing machine is adjusted. RPM and High Torque, and in the dehydration mode, the present invention relates to a technology capable of implementing High RPM and Low Torque, and may be applied to a driving apparatus of a washing machine motor.

100: motor control unit 110: gate driver
120: inverter 130: washing machine motor
140: connection state control unit U1 ~ U6: U-phase stator coil
V1 to V6: V phase stator coil W1 to W6: W phase stator coil

Claims (10)

A motor control unit generating a driving signal according to the washing control signal and generating a connection state control signal according to the washing mode, the rinsing mode, and the dehydration mode;
An inverter generating AC power by switching DC power according to the driving signal;
A BLDC motor for a washing machine driven according to AC power generated by the inverter; And
And a connection state adjustment unit for controlling a connection state of a plurality of stator coils provided in the washing machine BLDC motor in series connection or parallel connection according to the connection state control signal. According to claim 1, Between the motor control unit and the inverter
And a gate driver for amplifying the driving signal and outputting the driving signal to the inverter. The driving device of claim 1, wherein the connection state control unit comprises a plurality of relays. The method of claim 1, wherein the motor control unit
In the washing mode and the rinsing mode, the connection state of the plurality of stator coils is controlled by serial connection, and in the dehydration mode, the connection state control signal is generated to adjust the connection state of the plurality of stator coils to parallel connection. Driving device for the washing machine motor. The method of claim 1 or 4, wherein the parallel connection is
A drive device for a washing machine motor, characterized in that a plurality of stator coils are equally divided and connected in parallel. The method of claim 1, wherein the inverter generates three-phase AC power,
The washing machine motor is a three-phase washing machine motor driven according to the three-phase AC power,
The connection state control unit is a drive device for a washing machine motor, characterized in that for controlling each of the plurality of U-phase stator coils, a plurality of V-phase stator coils and a plurality of W-phase stator coils in series connection or parallel connection. The method of claim 6, wherein the parallel connection
And the plurality of U-phase stator coils, the plurality of V-phase stator coils, and the plurality of W-phase stator coils are equally divided and connected in parallel, respectively. Determining whether the motor control unit is in the washing mode, the rinsing mode, or the dehydration mode using the washing control signal;
In the determination result, in the washing mode or the rinsing mode, the motor control unit controls the connection state adjusting unit to connect the plurality of stator coils of the washing machine motor in series and generates a driving signal according to the washing control signal to drive the washing machine motor. Making a step; And
Driving the washing machine motor by connecting the plurality of stator coils of the washing machine motor in parallel by generating a driving signal according to the washing control signal by controlling the connection state adjusting unit in the dehydration mode as a result of the determination; Driving method of the washing machine motor comprising a. The method of claim 8, wherein the drive signal;
A driving method of a washing machine motor, characterized in that the PWM (Pulse Width Modulation) drive signal. The method of claim 8, wherein the parallel connection;
A driving method for a washing machine motor, characterized in that a plurality of stator coils are equally divided and connected in parallel.

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