KR20230030772A - Synchronous motor and its control apparatus and method - Google Patents

Abstract

The present invention relates to a synchronous motor which comprises: a motor stator; a first rotor formed of a permanent magnet inside the motor stator; a second rotor formed of a permanent magnet inside the motor stator and disposed to be spaced apart from the first rotor at a designated interval; and a phase converter for adjusting a phase between the first rotor and the second rotor.

Description

Synchronous motor and its control device and method {SYNCHRONOUS MOTOR AND ITS CONTROL APPARATUS AND METHOD}

The present invention relates to a synchronous motor and a control apparatus and method thereof, and more particularly, when controlling the field weakening of a permanent magnet synchronous motor, by adjusting the phase between the first rotor and the second rotor of the synchronous motor by hardware, It relates to a synchronous motor and a control device and method for reducing the computational load of a control unit.

In general, a synchronous motor is a type of AC motor and means a full-speed motor that rotates at a constant speed regardless of a load under a constant frequency.

These permanent magnet synchronous motors are widely used in electric vehicles due to their advantages in torque density, efficiency, etc., and accordingly, there is a trend that requires them to be able to operate at higher speeds than the rated speed and at various speeds.

On the other hand, in the permanent magnet synchronous motor, when the rotor (rotor) made of permanent magnet operates at high speed, the maximum speed is limited because the input voltage is offset by the counter electromotive force of the stator winding. , field weakening control algorithms such as current compensation value calculation and inverter output control are applied for high-speed operation.

However, since the conventional field-weakening control technology needs to perform inverter control by calculating a current compensation value every moment, there is a problem in that as the speed of the motor increases, more calculation load of the CPU occurs.

Therefore, there is a need for a technique capable of reducing the computational load of a complicated and excessive CPU and performing stable field-weakening control when controlling the field-weakening of a permanent magnet synchronous motor.

The background art of the present invention is disclosed in Korean Patent Registration No. 10-1231101 (registered on February 1, 2013, a separate motor).

According to one aspect of the present invention, the present invention has been created to solve the above problems, and when controlling the field weakening of the permanent magnet synchronous motor, the phase between the first rotor and the second rotor of the synchronous motor is determined by hardware. Its purpose is to provide a synchronous motor and its control device and method, which can reduce the computational load of the control unit by adjusting to.

A synchronous motor according to an aspect of the present invention includes a motor stator; A first rotor formed of a permanent magnet inside the motor stator; a second rotor formed of a permanent magnet inside the motor stator and spaced apart from the first rotor at a designated interval; And a phase converter for adjusting the phase between the first rotor and the second rotor.

In the present invention, the first rotor is rotated by being connected to one side of the first shaft, the other side of the first shaft is connected to the first vane of the phase shifter, and the second rotor is connected to the second shaft. It is characterized in that one side is connected and rotated, and the other side of the second shaft is connected to the second vane (132a) of the phase shifter.

In the present invention, the first shaft is characterized in that connected to the first rotor by penetrating the second shaft in the longitudinal direction.

In the present invention, the phase between the first rotor and the second rotor is characterized in that the same phase or different phases are adjusted corresponding to the rotation direction and rotation angle of the second vane.

In the present invention, the first vane portion is formed in a shape surrounding the second vane portion in a circular shape, and includes a plurality of first vanes formed to protrude at equal angular intervals toward the inside, and the second vane The portion is disposed inside the first vane portion and includes a plurality of second vanes formed to protrude from the circular body toward the outside at equal angular intervals.

In the present invention, in the second shaft, a first groove is formed around one side of the second shaft in the phase converter, a first hole is formed on one side of the first groove, and the second vane A second hole is formed on one side of the negative second vane in a second space direction, and a first hydraulic path through which hydraulic pressure flows is formed by connecting the first hole and the second hole to the inside of the second shaft. characterized by being

A control apparatus for a synchronous motor according to another aspect of the present invention controls the rotational speed of the synchronous motor, and controls a phase converter according to the rotational speed of the synchronous motor to control the first rotor and the second rotation of the synchronous motor. a controller that adjusts the phase of electrons; and a hydraulic valve unit for applying hydraulic pressure to the phase shifter and rotating the second vane of the phase shifter by a designated angle in a designated direction under the control of the control unit.

In the present invention, the control unit applies hydraulic pressure to a first space formed between the right side of the second vane formed in the second vane of the phase shifter and the first vane formed in the first vane to move the second vane The second vane may be rotated in a first direction, or hydraulic pressure may be applied to a second space formed between the left side of the second vane and the first vane to rotate the second vane in the second direction.

In the present invention, the control unit, when the second vane rotates in the first direction and the left side of the second vane is in close contact with the right side of the first vane as a default state, the first vane in the default state When the hydraulic pressure is applied to the second space formed between the left side of the 2 vane and the first vane to rotate the second vane in the second direction, the hydraulic pressure applied to the second space is discharged so that the second vane It is characterized in that the portion is rotated to return to the original first direction.

In the present invention, in order to apply or discharge hydraulic pressure to the first space and the second space, the second vane of the phase shifter and the second rotor of the synchronous motor are connected to the first groove and Second grooves are formed at different locations, a second hydraulic path and a hole are formed in the second vane portion from the second groove of the second shaft toward the first space direction, and the first A first hydraulic path and a hole from the groove toward the second space are formed in the second vane.

In the present invention, the control unit rotates the second vane by an angle specified in the first direction or the second direction, so that the second rotor connected to the second vane through the second shaft also moves in the first direction or the second direction. direction, so that the phase of the first rotor and the phase of the second rotor are controlled to be in phase, or the phase of the first rotor and the phase of the second rotor are different. It is characterized by controlling to become.

A control method of a synchronous motor according to another aspect of the present invention, wherein the control unit controls the rotational speed of the synchronous motor, and controls a phase converter according to the rotational speed of the synchronous motor to control the first rotor and the second rotor of the synchronous motor. adjusting the phase of the rotor; and applying, by a hydraulic valve, hydraulic pressure to the phase shifter under the control of the control unit, and rotating the second vane of the phase shifter by a designated angle in a designated direction by the hydraulic pressure. .

In the present invention, in order to adjust the phases of the first rotor and the second rotor of the synchronous motor, the control unit is formed on the right side of the second vane and the first vane formed on the second vane of the phase converter. Hydraulic pressure is applied to the first space formed between the formed first vanes to rotate the second vane in the first direction, or hydraulic pressure is applied to the second space formed between the left side of the second vane and the first vane. It is characterized in that the rotation of the second vane in the second direction by applying.

In the present invention, in order to adjust the phases of the first rotor and the second rotor of the synchronous motor, the control unit rotates the second vane in a first direction so that the left side of the second vane is the first rotor. When a state in close contact with the right side of the vane is referred to as a default state, hydraulic pressure is applied to the second space formed between the left side of the second vane and the first vane in the default state to move the second vane in the second direction. In the case of rotation, it is characterized in that by discharging the hydraulic pressure applied to the second space, the second vane is rotated to return to the original first direction.

In the present invention, in order to adjust the phases of the first rotor and the second rotor of the synchronous motor, the control unit rotates the second vane by a specified angle in the first direction or the second direction, The second rotor connected to the vane through the second shaft is also rotated in the first direction or the second direction so that the phase of the first rotor and the phase of the second rotor are controlled to be in phase, Alternatively, the phase of the first rotor and the phase of the second rotor are controlled to be in different phase states.

According to one aspect of the present invention, the present invention solves the problem of increasing the computational load of the control unit as the motor speed increases when the inverter control is performed by calculating the current compensation value at every moment in the field weakening control of the permanent magnet synchronous motor, By adjusting the phase between the first rotor and the second rotor of the synchronous motor by hardware, it is possible to reduce the calculation load of the control unit and perform stable field weakening control.

1 is an exemplary view showing a schematic configuration of a synchronous motor and a control device thereof according to an embodiment of the present invention;
2 is an exemplary diagram showing a schematic form of a phase shifter and a synchronous motor integrally implemented in FIG. 1;
3 is an exemplary view schematically showing a cross-sectional shape viewed from the top of the phase shifter in FIG. 1;
FIG. 4 is an exemplary view shown to explain an operation in which the phases of the first rotor and the second rotor of the synchronous motor are adjusted according to the rotation of the second vane of the phase shifter in FIG. 3;
5 is an exemplary view schematically showing a cross-sectional shape viewed from the side of the phase shifter in FIG. 1;
6 is a flowchart showing a method for controlling a synchronous motor according to an embodiment of the present invention.

Hereinafter, an embodiment of a synchronous motor and a control device and method thereof according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, definitions of these terms will have to be made based on the content throughout this specification.

1 is an exemplary diagram showing a schematic configuration of a synchronous motor and a control device thereof according to an embodiment of the present invention, and FIG. 2 is a schematic view of a phase converter and a synchronous motor integrally implemented in FIG. 1 This is an example shown.

As shown in FIG. 1, the synchronous motor and its control device according to the present embodiment include a control unit 110, a hydraulic valve unit 120, a phase shifter 130, a synchronous motor 140, and a reducer 150. includes

The controller 110 controls the rotational speed of the synchronous motor 140 .

In addition, the control unit 110 controls the phase converter 130 according to the rotational speed of the synchronous motor 140 to generate the first rotor 141 and the second rotor 142 of the synchronous motor 140. ) of the phase (that is, the phase of the N pole and the S pole of each permanent magnet constituting the first rotor and the second rotor) is adjusted.

The hydraulic valve unit 120 applies hydraulic pressure to the phase shifter 130 under the control of the control unit 110, and the second vane 132 of the phase shifter 130 is moved by the hydraulic pressure. By rotating in the designated direction, the first rotor 141 of the synchronous motor 140 connected to the first vane 131 and the second vane 132 of the phase shifter 130 by shafts, respectively, and The phase of the second rotor 142 is adjusted.

The reduction gear 150 increases torque by reducing and outputting the number of revolutions of the synchronous motor 140 according to a designated reduction ratio.

Referring to FIG. 2, the synchronous motor 140 has a first rotor 141 (or Main Rotor) formed of permanent magnets on the inside of the motor stator 143, and on the inside of the motor stator 143. It is formed of a permanent magnet and includes a second rotor 142 (or sub rotor) spaced apart from the first rotor 141 at a specific interval on the upper side (ie, in the direction of the phase shifter). At this time, it should be noted that the distance between the first rotor 141 and the second rotor 142 is somewhat exaggerated for better understanding.

The first rotor 141 rotates while being connected to one side of the first shaft Shaft_1, and the other side of the first shaft Shaft_1 is connected to the first vane 131 of the phase shifter 130. (see (a) of FIG. 5).

The second rotor 142 rotates by being connected to one side of the second shaft Shaft_2, and the other side of the second shaft Shaft_2 is connected to the second vane 132 of the phase shifter 130. (see (b) of FIG. 5).

The first shaft Shaft_1 penetrates the second shaft Shaft_2 in the longitudinal direction and is connected to the first rotor 141 .

The phase shifter 130 will be described below with reference to FIGS. 3 and 5 .

3 is an exemplary view schematically showing a cross-sectional shape viewed from the top of the phase shifter in FIG. 1, and FIG. 5 is an exemplary view schematically showing a cross-sectional shape viewed from the side of the phase shifter in FIG. 1.

Referring to FIG. 3, the first vane portion 131 of the phase shifter 130 is formed in a sawtooth shape in which a plurality of first vanes 131a protrude at regular intervals inside the circular housing, and Also in the two-vane portion 132, a plurality of second vanes 132a are formed in a sawtooth shape protruding at regular intervals outside the circular body.

That is, the first vane portion 131 is formed in a shape surrounding the second vane portion 132 in a circular shape, and protrudes toward the inside at equal angles (eg, 120 degrees) at intervals (eg, plural (eg: Three) first vanes 131a are formed.

In addition, the second vane portion 132 is disposed inside the first vane portion 131 and protrudes outward from the circular body at equal angles (eg, 120) intervals (eg, 3). ) of the second vane 132a is formed.

At this time, when the second vane part 132 rotates, the second vane 132a formed toward the outside is caught by the first vane 131a formed toward the inside of the first vane part 131 and rotates. The possible directions and angles are limited.

For example, in this embodiment, the rotation angle of the second vane part 132 is limited in the range of 120 degrees, and the second rotor 142 connected to the second vane part 132 by the second shaft (Shaft_2) When is rotated corresponding to the rotation angle of the second vane portion 132, a phase difference occurs between the first rotor 141 and the second rotor 142 (see FIG. 3).

However, in this embodiment, the shapes of the first vane portion 131 and the second vane portion 132 are shown to aid understanding of the present invention, and the shape or number of each vane is not intended to be limited. Note

Hereinafter, an operation of rotating the second vane 132 of the phase shifter 130 will be described.

Referring back to FIG. 3 , the second vane 132 is formed by applying hydraulic pressure to the first space SP1 formed between the right side of the second vane 132a and the first vane 131a. It rotates in a direction (eg, left direction) (see (a) in FIG. 3). In addition, the second vane 132 moves in the second direction (eg, right direction) as hydraulic pressure is applied to the second space SP2 formed between the left side of the second vane 132a and the first vane 131a. ) (see (b) in FIG. 3).

To this end, the hydraulic valve unit 120 may be implemented to apply or discharge hydraulic pressure to the first space SP1 (see (b) and (c) of FIG. 5 ).

For example, the second vane 132 rotates in a first direction (eg, leftward direction) so that the left side of the second vane 132a adheres to the right side of the first vane 131a (ie, FIG. 3 ). Assuming that (a) state) is the default state (or first state), the phase of the first rotor 141 connected to the first vane 131 through the first shaft Shaft_1 It is assumed that the phase of the N pole and the S pole of the permanent magnet) and the phase of the second rotor 142 connected to the second vane part 132 by the second shaft (Shaft_2) are in phase (Fig. see a),(b),(c)).

Meanwhile, in the default state (or first state), the controller 110 applies hydraulic pressure to the second space SP2 formed between the left side of the second vane 132a and the first vane 131a, thereby 2 By rotating the vane part 132 in the second direction (right direction) (see FIG. 3(b)) and discharging the hydraulic pressure applied to the second space SP2 by the controller 110, the second The vane 132 may be rotated to return to the original first direction (left direction) (see (a) of FIG. 3 ).

At this time, in order to apply the hydraulic pressure, referring to FIG. 5(b), a first groove G1 is formed around one side of the second shaft Shaft_2 in the phase shifter 130, and the first groove G1 is formed. A first hole H1 is formed on one side of the first groove G1, and a second hole H2 is formed on one side of the second vane 132a in the direction of the second space SP2. Referring to (c) of 5, a first hydraulic path (path1) through which hydraulic pressure can flow is formed by connecting the first hole (H1) and the second hole (H2) to the inside of the second shaft (Shaft_2). form

Accordingly, when the hydraulic pressure applying unit 121 applies hydraulic pressure while being in close contact with the first groove G1 formed around one side of the second shaft Shaft_2, the first hole H1 → the first By applying hydraulic pressure to the second space SP2 through the hydraulic path (path1) → second hole H2, the second vane portion 132 is rotated in the second direction (right direction) (Fig. 3 ( b)), conversely, by discharging (or sucking) the hydraulic pressure applied to the second space SP2 through the second hole H2 → the first hydraulic path path 1 → the first hole H1, The second vane 132 may be rotated to return to the original first direction (leftward direction) (see (a) of FIG. 3 ).

In addition, although not specifically shown in the drawing, the hydraulic valve unit 120 may be implemented to apply or discharge hydraulic pressure to the first space SP1 and the second space SP2, respectively.

For example, a second groove G2 is additionally formed around the other side of the second shaft Shaft_2 (eg, a second groove G2 is formed above or below the first groove), and After additionally forming a second hydraulic path (path2) and a hole in the direction of the first space (SP1) in the second groove (G2), respectively in the first space (SP1) and the second space (SP2) ( Alternatively, the second vane 132 may be rotated in the first direction (left direction) or the second direction (right direction) by applying or discharging hydraulic pressure (Fig. 3 (a), (b) reference).

As described above, as the second vane part 132 rotates in the first direction (left direction) or the second direction (right direction), the second rotor 142 connected to the second vane part 132 also rotates. By rotating in the first direction (left direction) or the second direction (right direction), the phase of the first rotor 141 (ie, the phase of the N pole and S pole of the permanent magnet) and the second rotor ( 142) becomes the same phase (see (a), (b), (c) of FIG. 4), or the phase of the first rotor 141 and the phase of the second rotor 142 This becomes a different phase state (see Fig. 4 (d), (e), (f)).

6 is a flowchart shown to explain a method for controlling a synchronous motor according to an embodiment of the present invention.

6, when the controller 110 assumes that the second rotor 142 and the first rotor 141 of the synchronous motor 140 are in phase (S101), the rotation speed of the synchronous motor When counter electromotive force adjustment is required according to (example of S102), by adjusting the magnitude (or amount) of hydraulic pressure applied to the phase shifter 130 and the direction of application of hydraulic pressure (eg, first spatial direction, second spatial direction) ( S103), the second rotor 142 and the first rotor connected to the first vane 131 and the second vane 132 of the phase shifter 130 through shafts Shaft_1 and Shaft_2, respectively. The phase difference between (141) is adjusted (S104).

As described above, the controller 110 adjusts the counter electromotive force acting according to the rotational speed of the synchronous motor 140 (eg, when the rotation of the second rotor relative to the first rotor rotates in a phase delayed by θ). , the field flux of the second rotor is reduced by cosθ), the phase of the first rotor 141 and the phase of the second rotor 142 are made in phase (Fig. 4 (a)) , (b), (c)), or after making the phase of the first rotor 141 and the phase of the second rotor 142 different ((d), (e of FIG. 4) ), (f) reference), the first rotor 141 and the second rotor 142 of the synchronous motor 140 are rotated at the same speed.

As described above, by adjusting the phases of the first rotor 141 and the second rotor 142 of the synchronous motor 140 to different phases, field weakening control can be performed in hardware.

Hereinafter, a principle of performing field weakening control by adjusting the phases of the first rotor 141 and the second rotor 142 to be in different phase states will be described.

(v: 전압, R: 권선저항, L: 인덕턴스, i: 권선전류, E: 역기전력),1) The electrical equation of an electric motor (i.e. motor):

(v: voltage, R: winding resistance, L: inductance, i: winding current, E: counter electromotive force),

(

: 상수,

: 계자자속, i: 권선전류),2) Motor torque:

(

: a constant,

: field flux, i: winding current),

(

: 역기전력 상수,

: 계자자속,

: 모터속도)으로 정의될 때, 정상상태에서 인덕턴스 항을 0으로 가정하면, 상기 수식 1), 2), 3) 으로부터 다음 토크(

) 수식이 도출된다.3) Back EMF :

(

: Back emf constant,

: field flux,

: motor speed), assuming that the inductance term is zero in the steady state, the following torque (from Equations 1), 2), and 3)

) formula is derived.

) 수식으로부터 토크(

)는 모터속도의 1차 함수로 볼 수 있으며, 동손실과 자기포화로 인해 인가전압에 제한이 있기 때문에 일정 토크에서 모터 속도가 제한되고, 여기서, 계자자속을 작아지게 한다면 더 빠른 속도로 제어할 수 있게 된다. 따라서 본 실시 예는 이러한 원리에 기초하여 회전자에 위상 변환기(130)를 적용해 토크를 발생시키는 유효 계자자속을 작아지게 하는 약계자 제어를 수행하는 것이다.The torque (

) from the expression of the torque (

) can be seen as a linear function of the motor speed, and because there is a limit to the applied voltage due to copper loss and magnetic saturation, the motor speed is limited at a certain torque. be able to Accordingly, the present embodiment performs field weakening control for reducing the effective field flux for generating torque by applying the phase shifter 130 to the rotor based on this principle.

As described above, the present embodiment solves the problem of increasing the computational load of the control unit as the motor speed increases when the inverter control is performed by calculating the current compensation value every moment during the field weakening control of the permanent magnet synchronous motor. By adjusting the phase between the first rotor and the second rotor in hardware, there is an effect of reducing the computational load of the control unit and enabling stable and robust field weakening control.

The present invention has been described above with reference to the embodiments shown in the drawings, but this is only exemplary, and those skilled in the art can make various modifications and equivalent other embodiments. you will understand the point. Therefore, the technical protection scope of the present invention should be determined by the claims below. Implementations described herein may also be embodied in, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Even if discussed only in the context of a single form of implementation (eg, discussed only as a method), the implementation of features discussed may also be implemented in other forms (eg, an apparatus or program). The device may be implemented in suitable hardware, software and firmware. The method may be implemented in an apparatus such as a processor, which is generally referred to as a processing device including, for example, a computer, microprocessor, integrated circuit, programmable logic device, or the like. Processors also include communication devices such as computers, cell phones, personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

110: control unit 120: hydraulic valve unit
130: phase shifter 131: first vane part
131a: first vane 132: second vane
132a: second vane 140: synchronous motor
141: first rotor 142: second rotor
143: motor stator 150: reducer
Shaft_1: 1st shaft Shart_2: 2nd shaft

Claims (15)

electric motor stator;
A first rotor formed of a permanent magnet inside the motor stator;
a second rotor formed of a permanent magnet inside the motor stator and spaced apart from the first rotor at a designated interval; and
A synchronous motor comprising a; phase converter for adjusting the phase between the first rotor and the second rotor.
According to claim 1,
The first rotor is rotated by being connected to one side of the first shaft, and the other side of the first shaft is connected to the first vane of the phase shifter,
The second rotor is connected to one side of the second shaft to rotate, and the other side of the second shaft is connected to the second vane of the phase shifter.
According to claim 2,
The synchronous motor, characterized in that the first shaft penetrates the second shaft in the longitudinal direction and is connected to the first rotor.
The method of claim 2, wherein the phase between the first rotor and the second rotor,
A synchronous motor characterized in that the second vane portion is adjusted in the same phase or different phases corresponding to the rotation direction and rotation angle of the second vane.
According to claim 2,
The first vane portion is formed in a shape surrounding the second vane portion in a circular shape, and a plurality of first vanes formed to protrude at equal angular intervals toward the inside; includes,
The second vane unit includes a plurality of second vanes disposed inside the first vane unit and protruding outward from the circular body at equal angular intervals.
The method of claim 2, wherein the second shaft,
A first groove is formed around one side of the second shaft in the phase converter,
A first hole is formed on one side of the first groove,
A first hole through which hydraulic pressure can flow by forming a second hole in a second space direction on one side of the second vane of the second vane unit and connecting the first hole and the second hole to the inside of the second shaft. A synchronous motor characterized in that a hydraulic path is formed.
The rotational speed of the synchronous motor according to any one of claims 1 to 6 is controlled, and a phase converter is controlled according to the rotational speed of the synchronous motor to rotate the first rotor and the second rotor of the synchronous motor. A controller for adjusting the phase of; and
Under the control of the control unit, a hydraulic valve unit for applying hydraulic pressure to the phase shifter and rotating the second vane of the phase shifter by a designated angle in a designated direction by the hydraulic pressure; controller.
The method of claim 7, wherein the control unit,
Hydraulic pressure is applied to a first space formed between the right side of the second vane formed in the second vane of the phase shifter and the first vane formed in the first vane to rotate the second vane in a first direction;
A control device for a synchronous motor, characterized in that for rotating the second vane in a second direction by applying hydraulic pressure to a second space formed between the left side of the second vane and the first vane.
The method of claim 8, wherein the control unit,
When the second vane rotates in the first direction and the left side of the second vane adheres to the right side of the first vane as a default state, in the default state, the left side of the second vane and the first vane In the case of rotating the second vane in the second direction by applying hydraulic pressure to the second space formed between the
A control device for a synchronous motor, characterized in that by discharging the hydraulic pressure applied to the second space, the second vane rotates to return to the original first direction.
According to claim 8,
In order to apply or discharge hydraulic pressure to the first space and the second space,
A first groove and a second groove are formed at different positions around a second shaft to which the second vane of the phase shifter and the second rotor of the synchronous motor are connected,
A second hydraulic path and a hole are formed in the second vane portion from the second groove of the second shaft toward the first space direction,
A control device for a synchronous motor, characterized in that a first hydraulic path and a hole directed from the first groove of the second shaft toward the second spatial direction are formed in the second vane.
The method of claim 8, wherein the control unit,
By rotating the second vane by a specified angle in the first direction or the second direction, the second rotor connected to the second vane through the second shaft is also rotated in the first or second direction,
The phase of the first rotor and the phase of the second rotor are controlled to be in phase, or the phase of the first rotor and the phase of the second rotor are controlled to be in different phases. A control device for a synchronous motor.
Controlling the rotational speed of the synchronous motor by a control unit, and adjusting the phases of the first rotor and the second rotor of the synchronous motor by controlling a phase converter according to the rotational speed of the synchronous motor; and
The hydraulic valve unit, under the control of the control unit, applies hydraulic pressure to the phase shifter, and rotates the second vane of the phase shifter by a designated angle in a designated direction by the hydraulic pressure. How to control an electric motor.
According to claim 12,
In order to adjust the phases of the first rotor and the second rotor of the synchronous motor,
The control unit,
Hydraulic pressure is applied to a first space formed between the right side of the second vane formed in the second vane of the phase shifter and the first vane formed in the first vane to rotate the second vane in a first direction;
A control method of a synchronous motor, characterized in that by applying a hydraulic pressure to a second space formed between the left side of the second vane and the first vane to rotate the second vane in a second direction.
According to claim 13,
In order to adjust the phases of the first rotor and the second rotor of the synchronous motor,
The control unit,
When the second vane rotates in the first direction and the left side of the second vane adheres to the right side of the first vane as a default state, in the default state, the left side of the second vane and the first vane In the case of rotating the second vane in the second direction by applying hydraulic pressure to the second space formed between the
A control method of a synchronous motor, characterized in that by discharging the hydraulic pressure applied to the second space, the second vane rotates to return to the original first direction.
According to claim 13,
In order to adjust the phases of the first rotor and the second rotor of the synchronous motor,
The control unit,
By rotating the second vane by an angle specified in the first direction or the second direction,
The second rotor connected to the second vane through the second shaft is also rotated in the first direction or the second direction,
The phase of the first rotor and the phase of the second rotor are controlled to be in phase, or the phase of the first rotor and the phase of the second rotor are controlled to be in different phases. A control method for a synchronous motor.

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