KR100960880B1 - Three phase permanent magnet excited transverse flux linear motor - Google Patents

Abstract

A three-phase permanent magnet excitation transverse flux linear motor is provided that can actively cope with space-constrained applications by presenting a method of arranging the mover arrangement in the direction of movement of the motor and perpendicular to the move direction of the mover. The A-phase motor is arranged in series with respect to the stator and consists of a first permanent magnet, a first mover core, and a first winding. The B-phase motor is arranged in series with respect to the stator and consists of a second permanent magnet, a second mover core, and a second winding. The C-phase motor is arranged in series with respect to the stator and consists of a third permanent magnet, a third mover core, and a third winding. The power converter is a pair of first switches connected to the A-phase motor to control the amount of current flowing to the A-phase motor, and a power switch connected to the B-phase motor to control the amount of current flowing to the B-phase motor. A pair of second switches, and a pair of third switches connected to the C-phase motor to control an amount of current flowing to the C-phase motor.

Three Phase Permanent Magnet Excitation Linear Motor

Description

Three phase permanent magnet excited transverse flux linear motor

The present invention relates to an electric motor, and more particularly to a three-phase permanent magnet excitation transverse flux linear motor.

Permanent magnet excitation lateral flux motors are known to have higher output (output / motor weight: kW / kg) and higher efficiency (output / input) than conventional motors, but power conversion for driving permanent magnet excitation lateral flux motors The device has the disadvantage that the structure is complicated and expensive compared to the power converter of the existing motor. If the permanent magnet excitation lateral flux motor can be configured in three phases like the existing linear motor structure and the power converter can be used in the form of a three-phase full bridge, it is possible to achieve high output and high efficiency by using the general-purpose three-phase driver. Permanent magnet excitation transverse flux motor can be driven. In the case of the transverse flux motor, since each phase of the motor is configured independently, the Y and Δ connections can be selected relatively freely in configuring three phases, and the arrangement in each phase is perpendicular to the arrangement in the traveling direction and the traveling direction. The arrangement structure is also possible. Therefore, in this example, the three-phase lateral motor is composed of Y and Δ connection in three-phase driving of the transverse motor, and shows the possibility of driving by the existing three-phase driver, and suggests a flexible arrangement method for the lateral flux motor. It aims at securing flexibility in application.

In general, a power conversion device for driving a permanent magnet excitation lateral flux motor uses an H-bridge type that requires four switches per phase. The power converter for driving a three-phase motor requires six switches, while the eight switches are required for a two-phase configuration, which is the minimum motor configuration requirement, to drive a permanent magnet excitation transverse motor. There are quite disadvantages in terms of aspects. In addition, in the case of the conventional permanent magnet excitation transverse flux linear motor, each phase is arranged only in the moving direction of the mover, so that as the number increases, the mover becomes longer in the moving direction, which is not suitable for a specific application due to spatial constraints. there was.

FIG. 1 is a structure of a power converter for driving one phase of a permanent magnet excitation transverse flux motor of the related art, and requires a DC power supply 1 and four power switching elements 2 such as an IGBT. The switch S1 and S4 are turned on when the positive current is to be applied to the motor, and the switch S2 and S3 are turned on when the negative current is to be applied.

2 is a configuration of a power converter for driving a three-phase permanent magnet excitation transverse flux motor by a conventional driving method. Each phase is controlled independently and requires a total of 12 switching elements (2). Turn on the switches S1 and S4, S5 and S8 and S9 and S12 to apply + current for each phase, and switch S2 and S3, S6 and S7 and S10 and S11 to turn on the current. Will be turned on. In this case, the three-phase configuration is such that the electrical phase difference between the phases is 120 degrees. Even if independent current control is performed for each phase, a current is applied to each phase so that the sum of the phase current vectors becomes zero at any time. shall.

Figure 3 shows the structure of a conventional permanent magnet synchronous linear motor. The conventional permanent magnet synchronous linear electric motor composed of three phases has a structure in which all three phase coils 9 are included in one mover 8. That is, there is a feature that the arrangement of each phase of the motor is not free and must be included in one mover.

The conventional permanent magnet excitation transverse flux motor has used two phases a lot. In order to drive a two-phase permanent magnet excitation lateral flux motor by the conventional driving method, four switches are required for each one-phase motor, and thus at least eight switches are required. In addition, in the case of a two-phase motor, the phase difference of each phase is 90 degrees, and the two-phase synthesized average thrust is increased by about 27% compared to the peak thrust generated by the one-phase motor, but the ripple of the thrust is more than 10%. In the case of driving it in three phases, the three-phase composite average thrust is increased by about 91% compared to the one-phase peak thrust, while the ripple has better driving characteristics than the two phases by about 5%. In addition, the number of switches for driving the motor is also six, it is possible to drive with fewer switches than the two-phase drive. In addition, the Y-phase and Δ-connections can be freely changed in the three-phase configuration due to the characteristics of the transverse flux motor, and thus can be selectively used according to the application. In terms of control performance, there was a burden to follow the sinusoidal current reference value when controlling by the conventional method, but it was changed to a control problem that maintains the current at a constant size by using a coordinate transformation method applied to the existing three-phase motor control. As a result, an improvement in control performance can be expected.

Even in the arrangement problem of an electric motor, the existing arrangement method arrange | positions each phase to a moving direction, and may be limited by space depending on a case.

The present invention has been invented to solve the above problems, by presenting a method of arranging the arrangement of the mover in the direction of movement of the motor and a method of arranging it so as to be perpendicular to the direction of movement of the mover to actively cope with applications that are limited in space. The purpose is to provide a three-phase permanent magnet excitation transversal linear motor.

In order to achieve the above object, the three-phase permanent magnet excitation transverse flux motor according to the present invention, the stator; An A-phase electric motor disposed in series with respect to the stator and configured of a first permanent magnet, a first mover core, and a first winding; A B-phase electric motor disposed in series with the stator and configured of a second permanent magnet, a second mover core, and a second winding; A C-phase motor disposed in series with respect to the stator and composed of a third permanent magnet, a third mover core, and a third winding; A pair of first switches connected to the A-phase motor to control the amount of current flowing to the A-phase motor, a pair of second connected to the B-phase motor to control the amount of current flowing to the B-phase motor A power converter including a switch and a pair of third switches connected to the C-phase motor to control an amount of current flowing to the C-phase motor, wherein the A-phase motor, the B-phase motor, and the The C-phase motors are characterized in that they are connected by Y or Δ connection so as to have a phase difference of 120 degrees with each other.

Three-phase permanent magnet excitation lateral flux motor according to another embodiment of the present invention the stator; An A-phase motor disposed in parallel with respect to the stator and composed of a first permanent magnet, a first mover core, and a first winding; A B-phase electric motor disposed in parallel with the stator and composed of a second permanent magnet, a second mover core, and a second winding; A C-phase motor disposed in parallel with the stator and composed of a third permanent magnet, a third mover core, and a third winding; a pair of connected to the A-phase motor to control the amount of current flowing to the A-phase motor A first switch, a pair of second switches connected to the B-phase motor to control the amount of current flowing to the B-phase motor, and controlling the amount of current to the C-phase motor connected to the C-phase motor And a power converter including a pair of third switches, wherein the A-phase motor, the B-phase motor, and the C-phase motor are connected in Y or Δ connection so as to have a phase difference of 120 degrees with each other. It features.

According to the present invention, when the permanent magnet lateral flux excitation motor is driven in the same manner as the conventional three-phase driving method, the cost or volume of the power converter can be reduced. In addition, by using a commercially available general-purpose three-phase driver, it is possible to use a high-reliability power converter without developing additional power converters, and use various control techniques used for driving conventional three-phase motors. have. As a result, by simplifying the structure of the motor-driven power converter and facilitating control, it is possible to improve the performance of the entire system and to reduce noise and vibration. In addition, it is possible to actively cope with the application of space and size constraints by diversifying the three-phase arrangement method of the permanent magnet excitation lateral flux motor.

The three-phase driving method of the permanent magnet excitation lateral flux motor according to the present invention is to apply a three-phase full bridge inverter for driving a permanent magnet synchronous motor or an inductor, and compared to the conventional permanent magnet excitation lateral flux motor driving driver. Can be reduced. There may be various driving methods of the existing permanent magnet excitation lateral flux motor. However, since the sinusoidal driving method is generally used, there is no problem even when driving by applying a three-phase full bridge inverter, and driving the existing three-phase motor. In addition, it is possible to improve the control performance through the coordinate axis transformation used in the circuit, and to improve the efficiency of use of the DC link voltage by applying SVPWM (Space Vector Pulse Width Modulation) and to reduce the harmonics. In addition, unlike the conventional three-phase electric motor, the permanent magnet excitation lateral flux motor has the advantage that it can be selectively applied to the Y connection or Δ connection when the three phase configuration is made of each module. In the case of Y-connected three-phase motors, the DC link voltage utilization rate is lower than that of Δ-connected three-phase motors, but the advantage is that the phase current to be supplied by the driver is minimal, so the wiring can be freely changed according to the characteristics of the application. do. Also, in the arrangement method of the mover, a parallel arrangement method in which the arrangement in the movement direction and the arrangement in the movement direction is perpendicular to the movement direction is proposed, so that it is possible to actively cope with an application that is limited in space or size.

FIG. 4 shows a power converter 2 for driving a three-phase permanent magnet excitation transverse flux motor composed of a Y connection according to the present invention and requires only six switches S1 to S6. Just as each phase is controlled independently, the sum of the current vectors flowing in the three phases at any moment becomes zero because the three phases are arranged with electrical phase differences of 120 degrees each. The current flow 3 shown in FIG. 3 corresponds to one of several cases in which + current is applied to the A-phase motor 310 and-current is applied to the B-phase motor 320 and the C-phase motor 330. The case is shown. In case of using the motor with Y connection, there is a disadvantage that the phase voltage utilization generated by the DC link voltage is relatively low on the driver side.However, since the current supplied from the driver coincides with the one-phase current of the motor, The advantage is that the current capacity of the driver can be small.

FIG. 5 shows a power converter 2 for driving a three-phase permanent magnet excitation transverse flux motor composed of a Δ connection according to the present invention, and requires only six switches S1 to S6. As in the case of the Y connection, since the three phases are arranged with electrical phase differences of 120 degrees each, the sum of the current vectors flowing in the three phases at any instant is zero. The flow of current 4 shown in FIG. 4 is for one of several cases, in which + current is applied to the A-phase motor 410 and-current is applied to the B-phase motor 420 and the C-phase motor 430. The case is shown. In the case of the Δ connection motor, the driver has the advantage that the utilization of each phase voltage by the DC link voltage is higher than that of the Y connection, but the current capacity of the driver is Y because the current supplied from the driver's phase does not match that of the motor. It is disadvantageous in that it becomes larger than the case of driving the connection motor.

6 is an input current (5) according to the position of the motor in each phase in the case of applying a permanent magnet excitation transverse flux motor composed of two phases according to the present invention, in order to continuously generate a force in one direction of the current according to the position of the mover In the case of A phase, a positive excitation current is applied at 0 ~ τ _p , 2 * τ _p ~ 3 * τ _p , and at τ _p ~ 2 * τ _p , 3 * τ _p ~ 4 * τ _p A negative excitation current is applied. The generated thrust (6) according to the motor position of each phase is a convex sine wave, and in the case of the A phase thrust, the change in the period of the current is the stimulus of the motor mover at the portions τ _p , 2 * τ _p , 3 * τ _p , and 4 * τ _p. Since the position and the magnetic pole position of the stator are perpendicular to the gap, no thrust is generated. The combined thrust 7 of the two-phase motor according to the motor position is a characteristic of the two-phase synthesized generation force depending on the time t or the motor position. In the case of a two-phase motor, each phase has a phase difference of 90 degrees. Assuming that the generated thrust is a sinusoidal waveform, the combined thrust of the two phases is always about 1.273 times the peak value of the motor thrust, and the thrust ripple is about 10%.

7 is the input current (5) according to the position of the motor in each phase in the case of applying the permanent magnet excitation lateral flux motor composed of three phases according to the present invention, the direction of the current must be changed according to the position of the mover to generate a force in one direction In the case of A phase, the polarity of the current is changed according to the position of the motor as in the case of two-phase driving, and the generated thrust 6 according to the position of the motor of each phase also has a part that does not generate a thrust according to the position. The combined thrust 7 of the three-phase motor according to the motor position is a characteristic of the three-phase synthesized generation force depending on the time t or the motor position. In the case of a three-phase motor, each phase has a phase difference of 120 degrees. Assuming that the generated thrust is a sinusoidal waveform, the combined thrust of the two phases is about 1.91 times the peak value of the one-phase motor, and the thrust ripple is about 5%. Therefore, in terms of thrust generation characteristics, three-phase electric motor has superior characteristics to two-phase electric motor.

8 is one of various arrangements of the permanent magnet excitation transverse flux linear motor according to the present invention, and shows a structure in which three phases are arranged in series in a traveling direction. Each phase of the permanent magnet excitation transverse flux linear motor, that is, the A phase is the first permanent magnet 810, the first mover core 820, and the first winding 830, the B phase is the second permanent magnet 840, the second Since the mover core 850, the second winding 860, and the C phase are independently composed of the third permanent magnet 870, the third mover core 880, and the third winding 890, the three-phase arrangement It is characterized in that it is free compared with the conventional electric motors. In applications in which the width of the mover should not be large, as shown in FIG. 8, each phase may be arranged to have a phase difference of 120 degrees electrically from each other in series with respect to the stator 13 in the moving direction.

9 shows a side view of the electric motor shown in FIG. 8.

4, 8, and 9, the three-phase permanent magnet excitation transverse flux motor according to the first embodiment of the present invention includes a stator 13, an A-phase motor 310, a B-phase motor 320, C-phase electric motor 330, and a power converter (2).

The A-phase motor 310 is disposed in series with respect to the stator 13 and is composed of a first permanent magnet 810, a first mover core 820, and a first winding 830. The B-phase electric motor 320 is disposed in series with respect to the stator 13 and is composed of a second permanent magnet 840, a second mover core 850, and a second winding 860. The C-phase electric motor 330 is disposed in series with respect to the stator 13 and is composed of a third permanent magnet 870, a third mover core 880, and a third winding 890.

The power converter 2 is connected to the A-phase motor 310 and a pair of first switches S1 and S2 for controlling the amount of current flowing through the A-phase motor 310 and the B-phase motor 320 Is connected to the pair of second switches (S3 and S4) and the C-phase motor 330 to control the amount of current flowing through the B-phase motor 320 to the C-phase motor 330 A pair of third switches S5 and S6 for controlling the amount of current flowing therein is provided.

The A-phase electric motor 310, the B-phase electric motor 320, and the C-phase electric motor 330 are connected in a Y connection so as to have a phase difference of 120 degrees with each other.

5, 8, and 9, the three-phase permanent magnet excitation transverse flux motor according to the second embodiment of the present invention, the stator 113, the A-phase motor 410, the B-phase motor 420, C-phase electric motor 430, and a power converter (2).

The A-phase electric motor 410 is disposed in series with respect to the stator 13 and is composed of a first permanent magnet 810, a first mover core 820, and a first winding 830.

The B-phase electric motor 420 is disposed in series with respect to the stator 13 and is composed of a second permanent magnet 840, a second mover core 850, and a second winding 860.

The C-phase electric motor 430 is disposed in series with respect to the stator 13 and is composed of a third permanent magnet 870, a third mover core 880, and a third winding 890.

The power converter 2 is connected to the A-phase motor 410, a pair of first switches (S41 and S42) for controlling the amount of current flowing through the A-phase motor 410, the B-phase motor 420 A pair of second switches S43 and S44 connected to the B-phase electric motor 420 to control the amount of current flowing through the B-phase electric motor 420, and a current flowing to the C-phase electric motor connected to the C-phase electric motor 430. A pair of third switches S45 and S46 for controlling the amount is provided.

The A-phase electric motor 410, the B-phase electric motor 420, and the C-phase electric motor 430 are connected to each other by Δ connection so as to have a phase difference of 120 degrees.

FIG. 10 is another arrangement structure of various arrangement structures of the permanent magnet excitation transverse flux linear motor according to the present invention, in which three phases are arranged in parallel in a traveling direction. In an application in which the length of the mover should not be long in the moving direction, as shown in FIG. 10, each phase may be arranged to have a phase difference of 120 degrees electrically from each other in parallel with respect to the stator 113 in the moving direction.

4 and 10, the three-phase permanent magnet excitation lateral flux motor according to the third embodiment of the present invention is a stator 113, A phase motor 310, B phase motor 320, C phase motor ( 330, and a power converter 2.

The A-phase motor 310 is disposed in parallel with respect to the stator 113 and is composed of a first permanent magnet 1010, a first mover core 1020, and a first winding 1030.

The B-phase electric motor 320 is disposed in parallel with respect to the stator 113 and includes a second permanent magnet 1040, a second mover core 1050, and a second winding 1060.

The C-phase electric motor 330 is disposed in parallel with respect to the stator 113 and includes a third permanent magnet 1070, a third mover core 1080, and a third winding 1090.

The power converter 2 is connected to the A-phase motor 310 and a pair of first switches (S1 and S2) for controlling the amount of current flowing through the A-phase motor 310, the B-phase motor ( A pair of second switches S3 and S4 connected to 320 to control the amount of current flowing through the B-phase electric motor 320, and the C-phase electric motor 330 to be connected to the C-phase electric motor 330. A pair of 3rd switches S5 and S6 which control the quantity of electric current which flows in is provided.

The A-phase electric motor 310, the B-phase electric motor 320, and the C-phase electric motor 330 are connected in a Y connection so as to have a phase difference of 120 degrees with each other.

5 and 10, the three-phase permanent magnet excitation lateral flux motor according to the fourth embodiment of the present invention is a stator 113, A phase motor 410, B phase motor 420, C phase motor ( 430, and a power converter 2.

The A-phase electric motor 410 is disposed in parallel with respect to the stator 113 and consists of a first permanent magnet 1010, a first mover core 1020, and a first winding 1030.

The B-phase electric motor 420 is disposed in parallel with respect to the stator 113 and is composed of a second permanent magnet 1040, a second mover core 1050, and a second winding 1060.

The C-phase electric motor 430 is disposed in series with respect to the stator 113 and includes a third permanent magnet 1070, a third mover core 1080, and a third winding 1090.

The power converter 2 is connected to the A-phase motor 410, a pair of first switches (S41 and S42) for controlling the amount of current flowing through the A-phase motor 410, the B-phase motor 420 Is connected to the pair of second switches (S43 and S44) for controlling the amount of current flowing through the B-phase motor 420, and the C-phase motor 430 to the C-phase motor 430 A pair of third switches S45 and S46 for controlling the amount of current flowing therein is provided.

The A-phase electric motor 410, the B-phase electric motor 420, and the C-phase electric motor 430 are connected to each other by Δ connection so as to have a phase difference of 120 degrees.

The three-phase permanent magnet excitation transverse motor according to the present invention can be applied to an industrial site in which an electric motor is used.

1 is a circuit diagram showing a power conversion device for driving a single phase of a permanent magnet excitation transverse flux linear motor used in the prior art.

2 is a circuit diagram showing a power conversion device for driving a three-phase permanent magnet excitation transverse linear motor by a conventional method.

3 is a perspective view showing the structure of a conventional three-phase permanent magnet synchronous linear motor.

4 is a circuit diagram illustrating a power conversion device for driving a Y-connected three-phase permanent magnet excitation transverse linear motor using a three-phase full bridge according to the present invention.

FIG. 5 is a circuit diagram illustrating a power conversion device for driving a Δ-connected three-phase permanent magnet excitation transverse linear motor using a three-phase full bridge according to the present invention.

6 is a waveform diagram showing current and thrust waveforms when driving a two-phase permanent magnet excitation transverse flux linear motor according to the present invention.

7 is a waveform diagram showing current and thrust waveforms when driving a three-phase permanent magnet excitation transverse flux linear motor according to the present invention.

8 is a perspective view showing the structure of the three-phase permanent magnet excitation transverse flux linear motor arranged in series with respect to the traveling direction according to the present invention.

9 is a side view of the electric motor shown in FIG. 8.

10 is a perspective view showing the structure of a three-phase permanent magnet excitation transverse linear motor arranged in parallel with respect to the traveling direction according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: DC power

2: power converter

3: Current flow of 3-phase motor connected by Y

4: Current flow of Δ connected three-phase motor

5: Phase current of three-phase permanent magnet excitation transverse flux linear motor

6: Phase thrust of three-phase permanent magnet excitation transverse linear motor

7: Composite thrust of a three-phase permanent magnet excitation transverse flux linear motor

8: mover

9: three-phase coil

13, 113: stator

310, 410: A phase motor

320, 420: B-phase motor

330, 430: C-phase motor

810, 1010: first permanent magnet

820, 1020: first mover core

830, 1030: first winding

840, 1040: second permanent magnet

850, 1050: second mover core

860, 1060: second winding

870, 1070: third permanent magnet

880, 1080: third mover core

890, 1090: third winding

Claims (2)

Stator; An A-phase electric motor disposed in series with respect to the stator and configured of a first permanent magnet, a first mover core, and a first winding; A B-phase electric motor disposed in series with the stator and configured of a second permanent magnet, a second mover core, and a second winding; A C-phase motor disposed in series with respect to the stator and composed of a third permanent magnet, a third mover core, and a third winding; A pair of first switches connected to the A-phase motor to control the amount of current flowing to the A-phase motor, a pair of second connected to the B-phase motor to control the amount of current flowing to the B-phase motor A power conversion device having a switch and a pair of third switches connected to said C-phase motor for controlling the amount of current flowing to said C-phase motor, The three-phase permanent magnet excitation transverse flux motor of the A-phase motor, the B-phase motor, and the C-phase motor are connected by Y or Δ connection so as to have a phase difference of 120 degrees. Stator; An A-phase motor disposed in parallel with respect to the stator and composed of a first permanent magnet, a first mover core, and a first winding; A B-phase electric motor disposed in parallel with the stator and composed of a second permanent magnet, a second mover core, and a second winding; A C-phase electric motor disposed in parallel with the stator and configured of a third permanent magnet, a third mover core, and a third winding; A pair of first switches connected to the A-phase motor to control the amount of current flowing to the A-phase motor, a pair of second connected to the B-phase motor to control the amount of current flowing to the B-phase motor A power conversion device having a switch and a pair of third switches connected to said C-phase motor for controlling the amount of current flowing to said C-phase motor, The three-phase permanent magnet excitation transverse flux motor of the A-phase motor, the B-phase motor, and the C-phase motor are connected by Y or Δ connection so as to have a phase difference of 120 degrees.

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