WO2014046487A1 - Motor including core which is rotationally provided on moving member - Google Patents

Description

An electric motor comprising a core rotatably mounted to the mover

The present invention relates to a motor of a new structure capable of producing large thrust (or torque). More particularly, the present invention relates to an electric motor including a core rotatably installed on a mover.

Electric motors are electric machines that convert electrical energy into mechanical energy. Electric motors include a rotary device that converts electrical energy into rotational motion and a linear motion device that converts into linear motion. Both motors with rotary motion and motors with linear motion operate on the same principle. Electric motors use magnetic fields as a medium in the process of converting electrical energy into mechanical energy. In addition, forces acting between the fixed magnets (or electromagnets) and the movable (or rotatable) magnets (or electromagnets) are generated (the forces that minimize the path of the magnetic flux passing through them), causing relative movement to occur. .

1 shows a schematic diagram of one embodiment of a linear motor in linear motion. The linear motor is a motor having a linear motion, and includes a stator 20 on which the conductive wire 21 is wound, and a mover 10 provided on the upper part of the stator 20 to enable linear movement. In addition, the movable magnet is provided with a permanent magnet 11. The current flowing through the conductive wire 21 of the stator 10 may be controlled to move the magnetic poles (for example, the N pole) along the magnetic pole moving surface 22 of the stator (in the order of P1 -P2-P3-P4). . If the S pole of the permanent magnet installed on the mover 10 is arranged to face the magnetic pole moving surface 22 of the stator and the N pole is formed on the P4 magnetic pole of the stator, as shown, the permanent magnet of the mover is attracted (F). ) Will be received. The attraction force F can be decomposed into a horizontal force Fx and a vertical force Fy. At this time, the vertical component Fy does not contribute to the movement of the mover, and only the horizontal component Fx contributes to the movement of the mover.

Figure 2 shows an embodiment of a permanent magnet motor for rotating motion. The reluctance motor includes a stator 40 on which the conductive wire 41 is wound, a rotor 30 rotatably installed in the stator 40, and a permanent magnet 31 installed on the rotor 30. The electric current flowing through the conducting wire 41 of the stator 40 can be controlled so that the magnetic poles (N-S poles arranged to be symmetrical) rotate (in the order of P1-P2-P3-P4). When the magnetic pole of the stator is formed as shown, the permanent magnet 31 installed in the rotor 30 is subjected to the magnetic force (F) by the magnetic poles formed in the stator (40). The magnetic force F can be resolved into the radial component Fr and the tangential component Ft. At this time, the radial force Fr cancels and does not contribute to the rotation of the rotor 30, and only the tangential component Ft contributes to the rotation of the rotor 30.

As described above, the conventional electric motor converts electrical energy into mechanical energy by using only a part of the magnetic force generated during operation. For example, a linear motor converts electrical energy into linear kinetic energy using only the horizontal component, and a rotary motor converts electrical energy into rotational kinetic energy using only the component in the normal direction. In the linear motor, the vertical component Fy is larger than the horizontal component Fx, and in the rotary motor, the radial component Fr is larger than the tangential component Ft. However, the conventional electric motor has a structure in which such a magnetic force cannot be utilized to generate rotational force.

In addition, with the development of electric vehicles, the development of electric motors requiring high torque and thrust has been actively progressed. In order to manufacture a motor having high torque, a permanent magnet having a high magnetic flux density is required, and an expensive rare earth-based raw material is required to manufacture a permanent magnet having a high magnetic flux density. Therefore, the manufacturing cost of the electric motor is increasing.

An object of the present invention is to provide a motor of a new structure that can utilize the vertical component (or radial component) in the rotational force generation of the magnetic force generated by the electrical energy. That is, an object of the present invention is to provide an electric motor capable of producing a higher thrust (or torque) by using not only the horizontal (tangential) component but also the vertical (radial) component. In addition, an object of the present invention is to provide an electric motor capable of providing a larger output by increasing energy conversion efficiency.

Moreover, an object of this invention is to provide the electric motor of a new structure which can output high thrust or torque, without using a permanent magnet. It is an object of the present invention to provide a motor of a new structure that can generate a large thrust (torque) that can be used commercially without using a permanent magnet by utilizing vertical (radial) component force for generating thrust (or torque). .

The electric motor according to the present invention includes a stator including a magnetic pole moving surface configured to move a magnetic pole in accordance with a change in a current direction flowing through a wound conductor, and a mover configured to move along the direction of movement of the magnetic pole. The mover includes: a movable base on which movement is constrained in a direction perpendicular to the moving direction of the magnetic pole; a core shaft fixed to the base such that a central axis is parallel to the magnetic pole moving surface of the stator; A core interleaved and rotatably installed, the core configured to interact with the magnetic poles of the stator to generate magnetic forces.

The core may be made of a ferromagnetic material that generates magnetic force by interacting with a magnetic pole of the stator. For example, a disc-shaped silicon steel sheet may be laminated. If a magnetic force is generated by a change in the magnetic field passing through the core when the stator's magnetic poles move, the horizontal component (or tangential component) of the generated magnetic force exerts a force to move the core axis in the horizontal direction, and perpendicular to the generated magnetic force. The directional component (or radial component) causes the core to rotate about the core axis. As the core rotates, the base whose movement is constrained in a direction perpendicular to the moving direction of the magnetic pole moves along the moving direction of the magnetic pole. In addition, the core may be configured to wind the wire to generate a magnetic force by interacting with the magnetic pole of the stator by electromagnetic induction. In addition, the core may be configured to install a permanent magnet on the outer peripheral surface of the core to interact with the magnetic pole of the stator to generate a magnetic force.

In addition, the motor according to the present invention may be configured to operate as a linear motor by configuring the magnetic pole moving surface of the stator in a plane, the magnetic pole moves along the longitudinal direction of the base. In addition, the core shaft may be configured in plural, arranged at regular intervals along the longitudinal direction of the base, and configured to exert a large force by sandwiching the ferromagnetic core in the hollow of each core shaft.

In addition, the motor according to the present invention may be configured to operate the rotary motor by configuring the stator in a hollow cylindrical shape, the magnetic pole moving surface is disposed on the hollow inner circumferential surface, the magnetic pole moves along the circumferential direction. It is preferable that the said core axis | shaft is comprised in multiple numbers, and it arrange | positions so that it may become symmetrical with respect to the center axis line of the magnetic pole moving surface of the said stator. In addition, at this time, the movable base is configured to be rotatably supported by the frame.

The motor according to the present invention includes a core rotatably installed on the mover to generate a thrust (or torque) by using a vertical (or radial) magnetic force. Therefore, greater thrust (torque) can be generated and the efficiency of converting electrical energy into mechanical energy can be increased. Further, according to the present invention, it is possible to provide an inexpensive electric motor capable of producing a large thrust (torque) without using a permanent magnet.

1 is a schematic diagram of a conventional linear electric motor

2 is a schematic diagram of a conventional rotary motor

3 is a schematic diagram of a basic structure of the motor for explaining the operation principle of the motor according to the present invention

4 is an explanatory diagram showing a distribution of magnetic force lines (equal potential) inside a core when the center of the stator magnetic pole is arranged to coincide with the center of the core of the mover;

5 is an explanatory diagram showing a distribution of forces acting on the outer circumferential surface of the core in the case of FIG.

6 is an explanatory diagram showing a distribution of forces acting on the magnetic pole moving surface of the stator in the case of FIG.

Fig. 7 is an explanatory diagram showing the distribution of magnetic force lines (equal potential) inside the core when the magnetic poles are arranged so that the center of the stator magnetic poles and the center of the core of the mover are shifted by two pitches;

FIG. 8 is an explanatory diagram showing a distribution of forces acting on the outer circumferential surface of the core in the case of FIG.

9 is an explanatory diagram showing a distribution of forces acting on the magnetic pole moving surface of the stator in the case of FIG.

10 is a schematic diagram of one embodiment of a linear motor according to the present invention;

11 to 13 are explanatory diagrams for explaining the operation of the linear motor shown in FIG.

14 is a schematic diagram of one embodiment of a rotary electric motor according to the present invention;

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention and the operating principle of the motor according to the present invention.

3 is a schematic diagram of a basic structure of the motor for explaining the operation principle of the motor according to the present invention. FIG. 3 schematically shows a part of the electric motor 300 of the embodiment shown in FIG. 10.

The motor 300 of the present embodiment includes a stator 100 and a mover 200. The stator 100 includes a stator iron core 110 having a plurality of slots 112 formed therein, and a plurality of conductive wires 120 wound around each slot. The slots 130 are numbered S1,..., S6 sequentially from the left side, and when current flows through the conductive wire 120, the projections P1 between neighboring slots of the stator core 110 are provided. , ... P5) a stimulus is formed. In the stator iron core 110, the magnetic pole moving surface 114 is formed by slots and protrusions. As illustrated in FIGS. 11 to 13, the direction of the current flowing through the plurality of wound wires 120 may be controlled so that the magnetic poles may sequentially move to the protrusions P1,..., P5 of the stator 100. have.

The mover 200 includes a movable base 210, and the core 230 is rotatably installed on the movable base 210. The core 230 has a hollow cylindrical shape, and is preferably formed by stacking a disc-shaped silicon steel sheet of ferromagnetic material, but is not limited thereto. Any ferromagnetic material may be used. The core 230 is installed to be rotatable by inserting a hollow into the core shaft 220 fixed to the movable base 210. The core shaft 220 is fixed to the movable base 210 so that the center axis thereof is disposed in parallel with the magnetic pole moving surface 114 of the stator iron core 110. Although not shown, the movable base 210 is constrained in a direction perpendicular to the moving direction of the magnetic pole of the stator iron core 210 (in the Y-axis direction in FIG. 3), so that the movable base 210 is moved only by sliding in the X-axis direction in FIG. 3. It is configured to be possible. In addition, the core 230 is spaced a predetermined distance (d) from the stator iron core (210). Since the core 230 is formed by stacking a ferromagnetic silicon steel sheet, the core 230 passes through the core when the magnetic pole is moved from P1 to P5 by controlling the current flowing through the conductive wire 120 of the stator 100. The path of the magnetic flux is changed to change the magnetic energy between the core 230 and the moving magnetic pole, and the changed magnetic energy is converted into mechanical energy and transmitted to the core 230.

FIG. 4 illustrates the inside of the core 230 when the N pole is positioned at the P3 magnetic pole of the stator iron core 110 so that the center of the core 230 of the mover 200 and the center of the stator 100 magnetic poles are aligned with each other. It shows the distribution of magnetic field lines. The magnetic field line distribution is the result obtained by computer simulation. In the simulation, the stator core 110 had an x-axis length of 120 mm, a y-axis height of 55 mm, a number of turns of coils per slot of 100, an outer diameter of the core of the mover of 97 mm, and an inner diameter of the core of the mover of 60 mm. Dirichlet boundary conditions and Half Periodic boundary conditions were used as boundary conditions. In addition, it is assumed that the center of the core is empty. Referring to FIG. 4, it can be seen that the distribution of the lines of magnetic force is completely symmetrical with respect to the center line C-C of the core 230.

FIG. 5: is explanatory drawing which shows distribution of the force acting on the outer peripheral surface of the core 230 in the case of FIG. The force distribution in FIG. 5 represents the tangential force Ft and the radial force Fr distributed on the outer surface of the core along the counterclockwise direction with respect to the 3 o'clock direction in the cross section of the core. Referring to FIG. 5, it can be seen that the tangential force Ft is distributed in the opposite direction and symmetric about 270 °, and the radial force Fr is distributed in the same direction and symmetrical. That is, since the tangential force is canceled out and only the radial force acts on the core in the vertical direction with the magnetic pole moving surface 114 of the stator 100, the core 230 fixed to the movable base 210 has a movable base. Since the movement is constrained in the direction perpendicular to the magnetic pole moving surface 114, the state is stopped and the mover 200 does not move in the horizontal direction.

FIG. 6: is explanatory drawing which shows the distribution of the force acting on the magnetic pole moving surface 114 of the stator iron core 110 in the case of FIG. In FIG. 6, the horizontal force Fx is distributed in the opposite direction and symmetrical with respect to the X coordinate 0 which is the center of the magnetic pole moving surface 114, and the vertical force Fy is distributed in the same direction and symmetrical. It can be seen. Accordingly, the horizontal force is canceled out, and only the vertical force acts on the magnetic pole moving surface 114 of the stator iron core 110. In addition, according to the law of action and reaction, it is understood that a force having the same magnitude and opposite direction as the sum of the horizontal and vertical components acting on the magnetic pole moving surface 114 of the stator iron core 110 acts on the core 230. Can be.

FIG. 7 is an explanatory diagram showing a distribution of magnetic force lines inside the core 230 when the magnetic poles are arranged so that the center of the stator magnetic poles and the center of the mover core are shifted by two pitches. That is, the center line C-C of the core 230 is located at the center of the magnetic pole P3 of the stator iron core 110 and represents the distribution of the magnetic field lines inside the core 230 when the magnetic pole C'-C 'is positioned at the magnetic pole P5. Referring to FIG. 7, it can be seen that the distribution of magnetic force lines in the core 230 and in the stator core 110 is not symmetrically distributed.

FIG. 8: is explanatory drawing which shows the distribution of the force acting on the outer peripheral surface of the core 230 in the case of FIG. 7, and FIG. 9 is the magnetic pole moving surface 114 of the stator iron core 110 in the case of FIG. It is explanatory drawing which shows the distribution of the force acting on (). 8 and 9, since the force is not symmetrically distributed in any case, there is a force for rotating the core 230. This phenomenon can be described with reference to FIGS. 4 and 7. Assume that the magnetic pole located in FIG. 4 moves to the position of FIG. 7. By controlling the current to move the pole from P3 to P5, the void between the pole and the core 230 increases. The magnetic force (force) acting between the moving magnetic pole and the core 230 acts in a direction to reduce the gap between the core 230 and the magnetic pole increased by the movement of the magnetic pole. Thus, the vertical force Fy acting on the core acts to rotate the core 230 clockwise. In addition, the horizontal force (Fx) acts to rotate the core counterclockwise while at the same time the center of the core 230 is linear movement. Since the vertical force Fy acting on the core 230 is much larger than the horizontal force Fx (more than 20 times), the core 230 rotatably installed on the movable base 210 is clockwise. At the same time it rotates and linear movement.

10 is a schematic diagram of an embodiment of a linear motor according to the present invention, and FIGS. 11 to 13 are explanatory views for explaining the operation of the linear motor shown in FIG.

Referring to FIG. 10, in the linear motor 300 of the present embodiment, the stator core 110 has 24 slots S1 to S24, and the mover 200 is rotatably installed on the movable base 210. Cores 230. The movable base 210 can be moved in the horizontal direction and is constrained so that it cannot move in the vertical direction. In addition, each slot S1-S24 of the stator core 110 is wound with a conductive wire 120 through which u-phase, v-phase, and w-phase currents flow, as shown to be connected to a three-phase power source.

In FIG. 10, the direction of the current flowing through the conductive wires 120 represents an initial state in which the sum of the magnetic forces caused by the current flowing through the conductive wires 120 is zero. In the initial state, the mover 200 remains stationary without moving. That is, in the initial state, current flows in one direction (for example, a direction coming out of the ground, hereinafter called a positive direction) to the conductive wire 120 of the odd-numbered slots S1, S3, S5, S7,..., S23. In the conducting wires 120 of the even-numbered slots S2, S4, S6, S8, ..., S24, current flows in the opposite direction (for example, the direction into the ground, hereinafter referred to as the reverse direction).

Referring to FIG. 11, at time t1, the current Iu flowing through the wire connected to the u-phase power is 0, and the current Iv flowing through the wire connected to the v-phase power flows in the opposite direction to the initial current. The current Iw flowing in the conductive wire connected to the w-phase power source allows current in the same direction as the initial current to flow. In this case, as shown in FIG. 11, the N pole S poles are alternately formed in order to have the maximum magnetic force in the vicinity of the slots S1, S4, S7, S10, S13, S16, S19, and S22. As described above with reference to FIGS. 3 to 9, when the centerline of the magnetic poles having the maximum magnetic force and the centerline of the cores 230 are slightly displaced, an attractive force is applied between the cores 230 and the stator core 110. do. Each of the cores 230 is linearly rotated by the force in the vertical direction of the attraction force, and moves the movable base 210 in the horizontal direction. When the cores 230 move to the vicinity of slots S4, S7, S10, and S13 having the maximum magnetic force, the distribution of the magnetic field acting on the cores 230 becomes as shown in FIG. 3 and stops.

Referring to FIG. 12, at the time t2 at which the cores 230 move to the vicinity of slots S4, S7, S10, and S13 having the maximum magnetic force, the current Iu flowing in the lead connected to the u-phase power is equal to the initial current. Direction, the current Iv flowing in the conductive wire connected to the v-phase power is 0, and the current Iw flowing in the conductive wire connected to the w-phase power causes the current in the opposite direction to the initial current. In this case, as shown in FIG. 12, the poles of the S pole N are alternately formed in order to have the maximum magnetic force in the vicinity of the slots S2, S5, S8, S11, S14, S17, S20, and S23. As in the case of FIG. 11, since the centerline of the magnetic poles having the maximum magnetic force and the centerline of the cores 230 are slightly displaced, an attractive force is applied between the cores 230 and the stator core 110, and the cores As the 230 is rotated, it moves to the vicinity of the slots S5, S8, S11, and S14 having the maximum magnetic force.

Referring to FIG. 13, at a time t3 at which the cores 230 move to the vicinity of slots S5, S8, S11, and S14 having the maximum magnetic force, the current Iu flowing in the lead connected to the u-phase power is opposite to the initial current. Direction, the current Iv flowing in the conductive line connected to the v-phase power source flows in the same direction as the initial current, and the current Iw flowing in the conductive line connected to the w-phase power source is zero. In this case, as shown in FIG. 13, the N pole S poles are alternately formed in order to have the maximum magnetic force in the vicinity of slots S3, S6, S9, S12, S15, S18, S21, and S24. As in the case of FIG. 12, since the centerline of the magnetic poles having the maximum magnetic force and the centerline of the cores 230 are slightly displaced, an attractive force is applied between the cores 230 and the stator core 110, thereby providing cores. As the 230 is rotated, it moves to the vicinity of the slots S6, S9, S12, and S15 having the maximum magnetic force.

As described above, since the movable base 210 in the linear motor 300 of the present embodiment is a linear movement, it can be used as a transport means for transporting objects in the workplace.

14 is a schematic diagram of one embodiment of a rotary electric motor according to the present invention.

The motor 700 of the present embodiment includes a stator 600 and a mover 700. The stator 600 includes a hollow cylindrical stator iron core 610 and conductive wires 620 for supplying three-phase power. 24 slots S1,..., S24 are formed in the hollow inner circumferential surface of the stator core 610 along the circumferential direction, and the conductive lines 620 are formed by the slots so that current flows in the direction as shown. S1, ..., S24). In addition, the magnetic pole moving surface 614 of the fixed iron core 610 is formed on the inner peripheral surface of the hollow stator iron core 610. In addition, the magnetic poles formed in the stator 600 by controlling the direction of the current flowing through the windings 620 are configured to move along the circumferential direction of the magnetic pole moving surface 614.

The mover 700 includes a movable base 710, four core shafts 720 fixed to the movable base 710, and four cores 730 rotatably installed on each core shaft 720. . The core axes 720 are arranged to be symmetrical about the hollow central axis of the stator core 610, ie at intervals of 90 ° in the circumferential direction. Although not shown, the movable base 710 extends in the longitudinal direction, and both ends thereof are supported by a bearing (not shown) so as to be rotatable about the hollow central axis of the stator iron core 610. Accordingly, the movable base 710 is constrained so as not to move in the radial direction from the hollow central axis of the stator core 610, and can be rotated (moved) in the circumferential direction.

In this embodiment, the cores 730 rotate in a clockwise direction when current flows in the conductive wire wound on the stator core 610 in the same order as described with reference to FIGS. 11 to 13. Since the movable base 710 is rotatably supported, the core shafts 720 move counterclockwise along the circumference formed by the core shafts 720. Accordingly, the movable base 710 rotatably supported by the bearing is rotated counterclockwise with respect to the hollow center axis of the stator iron core 610 as shown by the arrow, so that the output shaft of the rotary motor 500 is rotated. Will work. The mover 700 of this embodiment corresponds to the rotor of a normal rotary motor.

Embodiments according to the present invention described above should be understood as illustrative and not limiting the present invention, the motor according to the present invention can be modified in various forms. In addition to the above-described embodiments, for example, the core may be configured by winding a wire or using a permanent magnet, and the present invention may be embodied by those skilled in the art without departing from the spirit or scope. The present invention may be embodied in various forms within the scope of the claims and the equivalents thereof.

Claims (7)

An electric motor comprising a stator including a magnetic pole moving surface configured to move a magnetic pole in accordance with a change in a current direction flowing through a wound conductor, and a movable element configured to move by the movement of the magnetic pole. The mover includes: a movable base on which movement is constrained in a direction perpendicular to the moving direction of the magnetic pole; a core shaft fixed to the base such that a central axis is parallel to the magnetic pole moving surface of the stator; A core fitted in the hollow and rotatably installed, The core is configured to interact with a magnetic pole of the stator to generate a magnetic force. The method of claim 1, The magnetic pole moving surface of the stator is flat, and the magnetic pole is configured to move along the longitudinal direction of the base, The core shaft is plural and arranged at regular intervals along the longitudinal direction of the base, And a plurality of ferromagnetic cores, the motors being rotatably inserted into the hollows of the respective core shafts. The method of claim 1, The stator has a hollow cylindrical shape, the magnetic pole moving surface is disposed on the hollow inner peripheral surface, the magnetic pole is configured to move along the circumferential direction, The core axis is plural and arranged to be symmetrical with respect to the central axis of the magnetic pole moving surface of the stator, And the movable base is rotatably supported. The method according to any one of claims 1 to 3, The core is an electric motor consisting of a ferromagnetic material. The method of claim 4, wherein Wherein the core comprises a plurality of stacked ferromagnetic disk discs. The method according to any one of claims 1 to 3, The core comprises a wound wire. The method according to any one of claims 1 to 3, The core includes a permanent magnet.

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