DC motor having multi-phase armature winding coil wired to stator in independent and parallel manner, rotor having multiple permanent magnets, and coil wound in parallel according to pole of rotor

Abstract

The present invention relates to a DC motor having a multi-phase armature winding coil wired to a stator in independent and parallel manner, a rotor having multiple permanent magnets, and a coil wound in parallel according to the pole of the rotor. The DC motor comprises: a hollow stator having multiple coil wiring portions such that same can be wired in a multi-phase manner; a rotor disposed in the hollow portion of the stator, the rotor having a shaft provided at the center portion thereof, and the rotor being provided such that multiple permanent magnets can be inserted therein, thereby having multiple poles; a coil portion connected to each of the multiple poles and provided in parallel; and an encoder module connected to be spaced apart from the rotor and configured such that the direction in which an electric current is supplied is changed according to the poles of the rotor. In addition, the coil portion ensures that a uniform magnetic force is applied to each of the poles of the rotor, which are connected in parallel, such that the rotor can be rotated while minimizing noise and vibration. In addition, the present invention is advantageous in that the multiple coils are connected in parallel to each other, and the coils and the poles of the rotor are connected in parallel again such that a uniform magnetic field corresponds to one pole, thereby improving the torque of the motor.

Description

A DC motor having a rotor with a plurality of permanent magnets and a plurality of armature coils connected independently in parallel to the stator, and coils wound in parallel according to the poles of the rotor.

[0001] The present invention relates to a DC motor having a rotor having a plurality of permanent magnets and coils wound in parallel according to the poles of the rotor, and more particularly, to a DC motor having a plurality of permanent magnets and coils wound in parallel according to the poles of the rotor, and a stator having a plurality of independent parallel-connected armature coils and coils wound in parallel according to the poles of the rotor, using coils wound in parallel according to each phase and the poles of the rotor.

[0002] Typically, a commutator-free DC motor (CDC) is a motor that applies voltage to the armature windings of a three-phase synchronous motor through an inverter from a DC power source. These CDC motors can perform reverse and regenerative braking without changing the main circuit connections, and are mainly used in environments that require acceleration and deceleration. However, conventional CDC motors have a problem in that the ends of the coil assembly do not correspond to only one pole of the rotor, so the magnetic force according to the number of coil turns is divided according to the pole, which reduces the torque of the motor. In addition, when multiple coils are wound in series, the resistance value of each coil is applied differently, generating different magnetic fields, which can cause heat generation and vibration.

[0003] As a prior art document for solving the problems of such conventional electric motors, Korean Patent No. 10-0947172 discloses a permanent magnet motor with an integrated generator that has multiple permanent magnet rotors, ratchets, and generator coils so that repulsive force is applied in various directions depending on the poles.

[0004] However, even in these conventional technologies, there is a problem in that it is difficult to maximize the generation of a magnetic field generated from the coil of the stator corresponding to the magnetic field of the rotor.

[0005] The present invention has been devised to solve the problems of the prior art as described above, and its purpose is to improve the torque and rotational speed of the motor by corresponding coils wound in parallel according to the poles of each phase and rotor.

[0006] According to a preferred embodiment of the present invention, a DC motor having a rotor having a plurality of permanent magnets and a plurality of armature coils independently connected in parallel to a stator and a plurality of coils wound in parallel according to the poles of the rotor comprises: a hollow stator having a plurality of coil connection portions so as to be connected in a multi-phase manner; a rotor having a shaft provided at a center thereof and a plurality of poles into which a plurality of permanent magnets can be inserted; a coil portion connected to each of the plurality of poles and provided in parallel; and an encoder module connected to the rotor and spaced apart from the rotor, the encoder module changing the direction of current supply according to the poles of the rotor. In addition, the coil portion is characterized in that it allows a uniform magnetic force to be applied to each of the poles of the rotor connected in parallel, so that the rotor can rotate with minimal noise and vibration.

[0007] By means of solving the above problem, the present invention has the effect of improving the torque of the motor by connecting a plurality of coils in parallel with each other and connecting the poles of the coils and the rotor in parallel again so that a uniform magnetic field corresponds to one pole.

[0008] Additionally, by ensuring that a uniform magnetic field corresponds to the poles of the rotor through coils connected in parallel, it has the effect of minimizing heat generation, vibration, and noise generated when the motor is driven.

[0009] Figure 1 is a schematic diagram of coils connected in series in a conventional motor.

[0010] Figure 2 is a schematic diagram showing the serially connected coils of a conventional motor connected in parallel according to the polarity of the rotor.

[0011] FIG. 3 is a schematic diagram showing a DC motor according to a first embodiment of the present invention in which coil sections are connected in parallel to each other in the stator and a rotor having multiple polarities is arranged inside the stator.

[0012] FIG. 4 is a schematic diagram showing a DC motor having multiple polarities and coil sections arranged in parallel to correspond to the rotor according to the first embodiment of the present invention.

[0013] FIG. 5 is a schematic diagram showing an encoder module connected to a rotor and shaft with a permanent magnet inserted therein according to a first embodiment of the present invention.

[0014] FIG. 6 is a drawing showing a rotor according to the first embodiment of the present invention in which permanent magnets are inserted radially and a non-magnetic shielding member is laminated in the gap.

[0015] FIG. 7 is a drawing showing the magnetic field formed by the permanent magnet of the rotor according to the first embodiment of the present invention.

[0016] Fig. 8 is a drawing showing the magnetic field region formed by a permanent magnet in the rotor of a conventional motor formed inside the rotor.

[0017] FIG. 9 is a drawing showing a magnetic field formed by a permanent magnet of a rotor according to a first embodiment of the present invention, which is largely formed toward the outer stator side of the rotor by a shielding member.

[0018] Fig. 10 is an enlarged view showing in detail the width of the air gap and air gap of the rotor and stator according to the first embodiment of the present invention.

[0019] Fig. 11 is a schematic diagram showing the appearance of a coil section provided in three phases according to the first embodiment of the present invention.

[0020] Figure 12 is a drawing showing an encoder board, an encoder wheel, and a sensing unit of an encoder module according to a first embodiment of the present invention.

[0021] Fig. 13 is a schematic diagram showing the encoder wheel, the range of the detection area, and the arrangement of the sensing unit according to the first embodiment of the present invention.

[0022] Fig. 14 is a schematic diagram showing how the H-Bridge circuit of the encoder module according to the first embodiment of the present invention is connected to the sensing unit.

[0023] FIG. 15 is a drawing showing a state in which a signal from a sensing unit according to a first embodiment of the present invention is transmitted to an H-Bridge circuit and the direction in which current flows in a coil unit is controlled.

[0024] The terms used in this specification will be briefly explained, and the present invention will be described in detail.

[0025] The terms used in this invention have been selected from widely used, common terms, taking into account their functions. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Therefore, the terms used in this invention should be defined based on their meaning and the overall content of the invention, rather than simply their names.

[0026] When a part of a specification is said to “include” a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0027] Below, with reference to the attached drawings, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0028] Specific details, including the problems to be solved, means of solving them, and the effects of the invention, are included in the embodiments and drawings described below. The advantages and features of the present invention, and methods for achieving them, will become clearer with reference to the embodiments described below in detail, along with the accompanying drawings.

[0029] Hereinafter, with reference to the attached drawings, a DC motor having a rotor having a plurality of permanent magnets and a plurality of multi-phase electric field coils independently connected in parallel to the stator of the present invention and coils wound in parallel according to the poles of the rotor will be described in detail.

[0030] A DC motor having a rotor having a plurality of permanent magnets and a plurality of armature coils independently connected in parallel to a stator according to a first preferred embodiment of the present invention and coils wound in parallel according to the poles of the rotor, with reference to FIGS. 3 to 15, comprises: a hollow stator (100) provided with a plurality of coil connection parts (110) so as to be connected in a multi-phase manner; a rotor (200) provided with a shaft (205) at the center and provided so as to allow a plurality of permanent magnets (201) to be inserted and having a plurality of poles; a coil part (300) connected to the coil connection part (110) so as to correspond in parallel to the poles of the rotor (200); and an encoder module (400) connected to the rotor (200) so as to change the supply direction of current according to the poles of the rotor (200). Including. And, the coil part (300) causes a uniform magnetic force to be applied to each pole of the rotor (200), so that the rotor (200) can rotate with minimal noise and vibration.

[0031] More specifically, the present invention relates to a motor in which a plurality of coils provided in the coil section (300) are connected in parallel to each pole of the rotor (200) in a commutator DC motor using a permanent magnet (201) inserted into a rotor (200), and the coils of the coil section (300) are connected in parallel to each other, thereby obtaining a parallel-parallel winding. That is, in a multi-phase commutator DC motor, each coil corresponds to each pole, so that a uniform magnetic force can be applied, thereby minimizing vibration of the motor and enabling a higher torque to be output from a motor of the same specification. As shown in Fig. 1, in a conventional motor, each coil that meets a pole of the rotor is connected in series with each other, and the coils are wound so that the beginning and the end correspond to only one pole, so that there is a problem in that it is difficult for the magnetic force applied to the rotor to be uniform. And, as shown in Fig. 2, when coils are connected in series with each other, the resistance value of the fourth coil placed last may be more than four times greater than that of the first coil. The present invention was created to solve the problems associated with coils connected in such a series.

[0032] For example, the stator (100) is provided in a hollow shape so that the rotor (200) can be inserted inside. In addition, the inner surface of the stator (100) and the outer surface of the rotor (200) are provided to be spaced apart from each other, and the spaced gap is referred to as an air gap (G). In addition, the stator (100) allows the coil unit (300) to be connected, so that a magnetic field is generated in the stator (100) and a magnetic force is provided to the rotor (200). That is, if the magnetic force generated in the stator (100) is the same as the polarity of the rotor (200), a repulsive force due to the magnetic force is continuously generated so that the rotor (200) can rotate. For example, the stator (100) has a donut-shaped cross-section and is provided with coil connection parts (110) on the inner surface to which the coil parts can be connected. The coil connection parts (110) are arranged radially based on the center of the stator (100), have a narrow entrance side, and have a receiving space provided on the inner surface to allow the coil parts (300) to be easily connected. That is, the coil parts (300) are connected in parallel to each of the plurality of coil connection parts (110) provided radially, so that a magnetic field can be generated from the inner surface of the stator (100) to the inner side where the rotor (200) is arranged. In the present embodiment, since the description is based on a 4-pole 3-phase commutator motor, the coil connection parts (110) are provided in 12 numbers in the present embodiment, and 3 can be arranged for each quadrant of the rotor (200). In addition, the coil connection part (110) is provided with a uniform distance from each other and an even angle formed so that the magnetic force applied to the rotor (200) can be uniform.

[0033] In addition, the rotor (200) can rotate by reacting to the magnetic force generated from the coil portion (300) connected to the stator (100). At this time, a shaft (205) corresponding to the rotation axis of the motor is provided at the center of the rotor (200). In addition, the shaft (205) is connected to the rotor (200) and the encoder module (400) at the same time, and serves as the rotation axis of the rotor (200) and the encoder module (400). In addition, the rotor (200) has a plurality of permanent magnets (201) inserted therein to have polarity. In more detail, the rotor (200) includes a plurality of permanent magnets (201) radially inserted into the rotor (200), a central member (250) provided at the center of the rotor (200) and in contact with the permanent magnets (201) inserted into the rotor (200), a gap (260) provided to form an empty space at the end side of the permanent magnets (201) inserted into the rotor (200), and a shielding member (260) made of a non-magnetic material laminated on the gap (260). In addition, the gap (260) and the shielding member (261) allow the magnetic field region of the permanent magnet (201) to extend into the outer space of the rotor (200), thereby allowing the magnetic forces of the permanent magnet (201) and the coil portion (300) to strongly repel each other. At this time, in the present embodiment, since the rotor (200) is provided with four poles, the permanent magnets (201) may also be provided in four numbers. In addition, referring to FIGS. 5 and 6, since the four permanent magnets (201) are arranged radially based on the cross section of the rotor (200), the permanent magnets (201) may be arranged in a cross shape. At this time, the permanent magnets (201) are composed of first to fourth permanent magnets (201-1, 201-2, 201-3, 201-4) that are inserted respectively on the right, upper, left, and lower sides of the rotor (200). In addition, the permanent magnets (201) are arranged so that the same polarities as the permanent magnets (201) that are arranged adjacent to each other face each other.For example, the S poles of the first permanent magnet (201-1), the second permanent magnet (201-2), the third permanent magnet (201-3), and the fourth permanent magnet (201-4) are arranged to face each other. In addition, the N poles of the first permanent magnet (201-1), the fourth permanent magnet (201-4), the second permanent magnet (201-2), and the third permanent magnet (201-3) are arranged to face each other. Accordingly, as shown in FIG. 7, the magnetic field generated from the permanent magnet (201) can be applied in a loop shape. In addition, the rotor (200) can be arranged so that the polarities of the four quadrants intersect each other due to the arrangement of the permanent magnets (201). And, since the torque generated by the magnetic force of the rotor (200) is proportional to the number of poles provided in the rotor (200), a plurality of poles may be provided within a range that does not deviate from the embodiment of the present invention depending on the selection. However, for the purpose of explaining the present invention, a rotor (200) provided with four poles each, as in the present embodiment, will be described as an example. The rotor (200) includes a first pole (210) provided at a position corresponding to the first quadrant, a second pole (220) provided at a position corresponding to the second quadrant, a third pole (230) provided at a position corresponding to the third quadrant, and a fourth pole (240) provided at a position corresponding to the fourth quadrant, based on one side being divided into four equal parts. At this time, the first pole (210) and the third pole (230) are assumed to be S poles, and the second pole (220) and the fourth pole (240) are assumed to be N poles. And, the rotor (200) can be rotated by the first to fourth poles (210, 220, 230, 240) being subjected to a magnetic repulsive force by the coil unit (300).

[0034] In addition, the central member (250) is provided at the core of the rotor (200) to ensure that the permanent magnet (201) is stably installed and to prevent the magnetic field of the permanent magnet (201) from being transmitted to the shaft (205). In more detail, the central member (250) is formed of a non-magnetic metal and is provided to surround the shaft (205), thereby shielding the magnetic field of the permanent magnet (201) from being transmitted to the shaft (205). The non-magnetic metal may be set to a material such as stainless steel. In addition, the central member (250) is provided in a square shape and is formed along the longitudinal direction at the center of the rotor (200). At this time, in the case where the rotor has more poles, such as 6 or 8 poles rather than 4 poles as in the present embodiment, the number of sides of the central member (250) is set according to the number of poles. That is, if six permanent magnets (201) are radially inserted into the rotor (200), the central member (250) can be provided in a hexagonal shape. In addition, a mounting portion (251) that comes into contact with the permanent magnet (201) is provided on each surface of the central member (250). In addition, a dovetail portion (252) is provided on each corner of the central member (250). The dovetail portion (252) is formed so that the central member (250) can be coupled to the rotor (200) in a fitting manner. For example, the dovetail portion (252) is provided in a fan shape that protrudes outward from the edge of the mounting portion (251). That is, the dovetail portion (252) is provided at each of the four corners of the central member (250) so that the central member (250) can be firmly coupled with the rotor (200). Accordingly, even if the rotor (200) rotates at high speed, the central member (250) can rotate integrally with the rotor (200) without shaking or being separated and without generating vibration.

[0035] In addition, the gap (260) is formed so that an empty space is provided between the permanent magnet (201) and the outer surface of the rotor (200). More specifically, the gap (260) is formed narrower than the width of the permanent magnet (201) so that the permanent magnet (201) inserted into the rotor (200) is not separated out by centrifugal force due to the rotation of the rotor (200). In addition, the gap (260) is formed in a form in which the width gradually narrows from the inside toward the outer surface of the rotor (200). That is, the gap (260) is formed so that a dovetail-shaped receiving space, such as a trapezoid, is formed along the longitudinal direction of the rotor (200). In addition, the gap (260) serves to close the magnetic path of the magnetic field generated from the permanent magnet (201) by forming an empty space on one side of the conductive rotor (200). For example, as shown in FIG. 8, in a conventional motor without the gap (260), a magnetic path is formed between the permanent magnet and the rotor, so that the magnetic field can be concentratedly distributed in the space within the rotor. Due to this, the repulsive force between the magnetic field generated from the coil unit (300) connected to the stator (100) and the magnetic field generated from the rotor may be weakly applied, thereby lowering the torque of the motor. On the other hand, with reference to FIG. 9, when the gap (260) is provided as in the present embodiment, the magnetic field area by the permanent magnet (201) is distributed so as to extend to the outer range of the outer circumferential surface of the rotor (200), so that the repulsive force with the magnetic field generated from the coil unit (300) can be stronger. That is, the gap (260) induces the magnetic field by the permanent magnet (201) to come closer to the stator (100), thereby increasing the torque of the motor. At this time, referring to Fig. 10, the width (L) on the inlet side of the gap (260) is formed to be larger than the air gap (G) between the rotor (200) and the stator (100).When the gap width (L) is smaller than the air gap (G), the magnetic field by the permanent magnet (201) is not induced close to the stator (100), so that the increase in the repulsive force by the magnetic field can be reduced. In addition, the shielding member (261) prevents noise and vibration generated when the rotor (200) rotates at high speed due to the empty space created by the gap (260). In addition, the shielding member (261) fixes the permanent magnet (201) inserted into the rotor (200) so that it does not come out due to the centrifugal force caused by the high speed rotation. In addition, the shielding member (261) is provided so that one surface adjacent to the stator (100) side has the same radius of curvature as the outer surface of the rotor (200), so that the drag applied when the rotor (200) rotates can be minimized.

[0036] In addition, the coil unit (300) includes a plurality of coil bundles (301) that are connected in parallel to each other. And, the coil bundles (301) are connected in parallel to the poles of the rotor (200), respectively. In particular, the coil bundles (301) are provided with the same number of turns and have the same resistance value, so that a uniform magnetic force can be applied to the poles of the rotor (200). In more detail, the coil unit (300) is provided in a multi-phase manner, is connected in parallel for each phase, and is also connected in parallel to the poles of the rotor (200). That is, the coil bundles (301) of the coil unit (300) are each provided with the same number of turns and have the same resistance value, so that the magnetic force applied to the poles of the rotor (200) is uniform. At this time, the coil part (300) may be provided with multiple phases within a range that does not deviate from the embodiment of the present invention, as described in the rotor (200), but for the purpose of explaining the present invention, it will be described as being expressed as three phases. For example, referring to FIG. 11, the coil part (300) includes a first coil part (310) defined as phase A, a second coil part (320) defined as phase B, and a third coil part (330) defined as phase C. The first to third coil parts (310, 320, 330) constituting each phase are provided with coil bundles (301) according to the number of poles so that the coil bundles (301) can correspond to the first to fourth poles (210, 220, 230, 240) provided in the rotor (200), respectively. That is, four coil bundles (301) are provided in the first to third coil sections (310, 320, 330). In addition, the coil bundles (301) are connected in parallel with each other. In addition, the plurality of coil bundles (301) are provided so that the number of turns is the same but the winding direction is different. For example, the first and third coil bundles (301) from the left side of the coil section (300) are wound so that the direction of the current is toward the left, and the second and fourth coil bundles (301) are wound so that the direction of the current is toward the left.That is, the coil unit (300) is configured so that the coil bundles (301) are connected in parallel with each other, but the winding direction in the adjacent coil bundles (301) is configured so that the direction of the current is opposite. When the coil bundles (301) that are provided in multiple numbers of such coil units (300) and connected in parallel are respectively connected in parallel according to the poles of the rotor (200), the torque applied to each pole of the rotor (200) is uniform, so that the noise and vibration generated when the motor is driven can be minimized. In addition, since the time for which electricity is energized to each of the coil bundles (301) is uniform, the rotational displacement detection section of the rotor (200) according to the encoder module (400) to be described later can be reduced, and thus the time for which electricity is energized to the coil unit (300) can be adjusted to decrease or increase. Then, with reference to FIG. 3, an example in which the coil unit (300) is connected in parallel to the rotor (200) will be described. The + pole of the first coil part (310) corresponding to the above A phase is connected to the first pole (210) and the third pole (230), and the - pole is connected to the second pole (220) and the fourth pole (240). At this time, the first coil part (310) is connected to the rotor (200) as a pair, with the + pole connected to the first pole (210) and the - pole connected to the fourth pole (240), and the + pole connected to the third pole (230) and the - pole connected to the second pole (220) are connected to the rotor (200) as the remaining pair. In addition, the + pole of the second coil part (320) corresponding to the above B phase is connected to the first pole (210) and the third pole (230), and the - pole is connected to the second pole (220) and the fourth pole (240). At this time, the second coil part (320) is connected to the rotor (200) as a pair, with the + pole connected to the first pole (210) and the - pole connected to the fourth pole (240), and the + pole connected to the third pole (230) and the - pole connected to the second pole (220) are connected to the rotor (200) as the remaining pair.In addition, the + pole of the third coil part (330) corresponding to the C phase is connected to the first pole (210) and the third pole (230), and the - pole is connected to the second pole (220) and the fourth pole (240). At this time, the third coil part (330) is connected to the rotor (200) as a pair, with the + pole connected to the first pole (210) and the - pole connected to the fourth pole (240), and the + pole connected to the third pole (230) and the - pole connected to the second pole (220) as the remaining pair, are connected to the rotor (200). In addition, each coil bundle (301) of the first to third coil parts (310, 320, 330) is arranged to be sequentially connected to the rotor (200) in the order of coil bundle (301) of the first coil part (310) to coil bundle (301) of the third coil part (330).

[0037] Next, referring to FIGS. 12 to 15, the encoder module (400) is connected to a shaft (205) that protrudes upward from the center of the rotor (200). In addition, the encoder module (400) detects the rotational displacement of the rotor (200) so that a standard can be set for adjusting the current applied to the coil unit (300). For example, the encoder module (400) includes a circular encoder board (410) that is fixed in place while being connected to the shaft (205), an encoder wheel (420) that is arranged on one side of the encoder board (410) and is connected to the shaft (205) and rotates, and a sensing unit (430) that is arranged so that one side is seated on one side of the encoder wheel (420) while being installed on the encoder board (410) and allows rotational displacement of the pole to be detected. The encoder board (410) allows a signal detected by the sensing unit (430) to be transmitted to the coil unit (300). At this time, the coil unit (300) allows the electricity excited in the first to third coil units (310, 320, 330) and the coil bundle (301) to be controlled according to the signal received from the sensing unit (430). In addition, the encoder wheel (420) can rotate together with the rotation of the rotor (200) on the encoder board (410). That is, the encoder board (410) and the sensing unit (430) are static, and only the encoder wheel (420) is fixed to the shaft (205) connected to the rotor (200) and can rotate together. In addition, the sensing unit (430) is composed of a group of commutation sensors (431, 432, 433, 434, 435, 436) provided in multiple numbers to correspond to each phase of the coil unit (300). In the present invention, since the coil part (300) is defined as three phases, the sensing part (430) is composed of six commutation sensor groups (431, 432, 433, 434, 435, 436) according to the number of phases of the coil part (300).If the coil unit (300) is provided with four phases, it is natural that the sensing unit (430) is composed of eight groups of commutation sensors. That is, the sensing unit (430) is composed of two commutation sensors corresponding to each phase of the coil unit (300). In addition, the sensing unit (430) is provided so that one side is spaced apart from one side of the encoder board (410) while being connected to one side of the encoder board (410). In addition, the rotational displacement of the rotor (200) can be detected through a portion of the sensing unit (430) spaced apart from one side of the encoder board (410). At this time, one side corresponding to the edge of the encoder wheel (420) is provided so that it can be placed between the sensing unit (430) and the encoder board (410). And, the encoder wheel (420) includes a detection area portion (421) provided so that both sides of the encoder wheel (420) are sunken. And, the detection area portion (421) enables the rotational displacement of the pole to be detected by the sensing portion (430) when the encoder wheel (420) rotates and the detection area portion (421) comes into proximity with the sensing portion (430). For example, referring to FIGS. 12 and 13, the detection areas (421) are sunken symmetrically with respect to the centrifugation of the encoder board (410). In addition, when the detection area (421) comes into proximity to the sensing unit (430) as the encoder wheel (420) rotates, the commutation sensor group (433, 434) corresponding to the detection area (421) among the commutation sensor groups (431, 432, 433, 434, 435, 436) of the sensing unit (430) is activated, and the rotational displacement of the pole of the rotor (200) can be detected. At this time, the commutation sensor group (431, 432, 433, 434, 435, 436) of the sensing unit (430) that does not correspond to the detection area (421) can be kept in an off state and standby.And, among the commutation sensor groups (431, 432, 433, 434, 435, 436) of the sensing unit (430), the commutation sensor group (433, 434) corresponding to the detection area unit (421) transmits a signal to the coil unit (300), so that a magnetic field is generated in the coil unit (300) according to the rotational displacement of the rotor (200). In addition, depending on the preset range of the detection area unit (421), the time during which electricity is excited to the coil unit (300) according to the detection of the rotational displacement of the rotor (200) may be reduced or increased. At this time, the sensing unit (430) may be provided as either a sensor that detects magnetism or a sensor that detects light. In the case where the sensing unit (430) is provided as a sensor that detects magnetism, a magnet having a magnetic field is attached to the sensing area (421) of the encoder wheel (420) so that a signal sensing area can be configured. In addition, in the case where the sensing unit (430) is provided as a sensor that detects light, light is detected in the sensor group corresponding to the sensing area (421) and an ON signal is generated, and in the sensor group corresponding to an area outside the sensing area (421), light is blocked by the encoder wheel (420) and an OFF signal is generated. In addition, the sensor groups (431, 432, 433, 434, 435, 436) are arranged at a 30-degree angle with respect to the shaft (205) axis, and the sensing area (421) is arranged at a 60-degree angle so that the sensor groups (431, 432, 433, 434, 435, 436) can sequentially generate signals.

[0038] In addition, referring to FIGS. 14 and 15, the encoder module (400) is provided in the form of an H-Bridge circuit. For example, when the sensor group (431) corresponding to the A+ phase among the sensor groups (431, 432, 433, 434, 435, 436) transmits a signal, the current is transmitted to the Q1 and Q4 switches as shown in (a) of FIG. 15, and the current flows from left to right. Conversely, when the sensor group (434) corresponding to the A- phase among the sensor groups (431, 432, 433, 434, 435, 436) transmits a signal, the current is transmitted to the Q2 and Q3 switches as shown in (b) of FIG. 15, and the current flows from right to left. At this time, the magnetic force applied as the direction of the current flowing in each coil bundle (301) of the coil section (300) is set is controlled in accordance with the rotational displacement and polarity of the rotor (200).

[0039] It should be understood that the embodiments described above are illustrative in all respects and not restrictive, and the scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0040] [Explanation of symbols]

[0041] 100: Stator

[0042] 110: Coil wiring section

[0043] 120: Fixed bolt

[0044] 130: Cover

[0045] 200: Rotor

[0046] 201: Permanent magnet

[0047] 201-1: First permanent magnet

[0048] 201-2: Second permanent magnet

[0049] 201-3: Third permanent magnet

[0050] 201-4: Fourth permanent magnet

[0051] 205: Shaft

[0052] 210: First pole

[0053] 220: Second pole

[0054] 230: The Third Pole

[0055] 240: The Fourth Pole

[0056] 250: Central material

[0057] 251: Anchoring

[0058] 252: Dovetail section

[0059] 260: Gap

[0060] 261: Shielding member

[0061] 300: Coil section

[0062] 301: Coil bundle

[0063] 310: First coil section

[0064] 320: Second coil section

[0065] 330: Third coil section

[0066] 400: Encoder module

[0067] 410: Encoder board

[0068] 420: Encoder wheel

[0069] 421: Detection area

[0070] 430: Sensing unit

[0071] 431,432,433,434,435,436: Sensor group

[0072] Air gap: G

[0073] Gap width: L

Claims

1. A hollow stator having multiple coil connection sections so that it can be connected in multi-phase; A rotor having a plurality of poles, which is arranged in the hollow portion of the stator and has a shaft provided in the center and a plurality of permanent magnets inserted therein; A coil part connected to the coil connection part so as to correspond in parallel to each pole of the rotor; and An encoder module is connected to the rotor and is spaced apart from the rotor, and changes the direction of current supply according to the pole of the rotor; A DC motor having a rotor having a plurality of permanent magnets and a multi-phase armature winding coils independently connected in parallel to a stator, characterized in that the coil section applies a uniform magnetic force to each pole of the rotor, so that the rotor can rotate with minimal noise and vibration, and a coil wound in parallel according to the poles of the rotor.

2. In paragraph 1, The above rotor, A central member provided at the center of the rotor and in contact with a permanent magnet inserted into the rotor; A DC motor having a stator having a plurality of permanent magnets and a plurality of parallel-connected multi-phase armature winding coils, characterized in that the central member is made of a non-magnetic material to prevent the magnetic field of the permanent magnet from flowing to the shaft, and a rotor having a plurality of permanent magnets and coils wound in parallel according to the poles of the rotor.

3. In paragraph 1, The above rotor, A gap is provided so that an empty space is formed at the end side of the permanent magnet inserted into the rotor; and A shielding member made of a non-magnetic material laminated in the above gap is included; A DC motor having a rotor having a plurality of permanent magnets and coils wound in parallel according to the poles of the rotor, and a multi-phase armature winding coil independently connected in parallel to the stator, characterized in that the above gap and shielding member allow the magnetic field area of ​​the permanent magnet to extend into the outer space of the rotor, thereby allowing the magnetic forces of the permanent magnet and the coil section to strongly repel each other.

4. In paragraph 1, The above coil part, comprising a plurality of coil bundles connected in parallel with each other; A DC motor having a rotor having a plurality of permanent magnets and a multi-phase armature winding coils independently connected in parallel to the poles of the rotor, characterized in that the coil bundle is connected in parallel to each pole of the rotor, and a coil wound in parallel according to the poles of the rotor.

5. In paragraph 4, The above coil bundle, A DC motor having a rotor having a plurality of permanent magnets and a multi-phase armature winding coils independently connected in parallel to a stator, characterized in that the stator is provided with the same number of turns and has the same resistance value so that a uniform magnetic force can be applied to the poles of the rotor, and a coil wound in parallel according to the poles of the rotor.

6. In paragraph 1, The above encoder module, A circular encoder board fixed in place while being connected to the above shaft; An encoder wheel arranged on one side of the encoder board and connected to the shaft to rotate; and A DC motor having a stator having a plurality of permanent magnets and a rotor having multi-phase armature winding coils independently connected in parallel and a plurality of coils wound in parallel according to the poles of the rotor, characterized in that it includes a sensing unit that is arranged so that one side is mounted on one side of the encoder wheel while installed on the encoder board, and that enables the rotational displacement of the poles to be detected.

7. In paragraph 6, The above encoder wheel, A detection area section is provided such that both sides of the encoder wheel are sunken based on the centrifugal force of the encoder board; A DC motor having a stator having a plurality of permanent magnets and a rotor having multi-phase armature coils independently connected in parallel and coils wound in parallel according to the poles of the rotor, characterized in that when the encoder wheel is rotated and the detection area is brought adjacent to the sensing unit, the rotational displacement of the pole can be detected by the sensing unit.

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