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EP-4742516-A1 - 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

EP4742516A1EP 4742516 A1EP4742516 A1EP 4742516A1EP-4742516-A1

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.

Inventors

  • KANG, KI CHEOL

Assignees

  • Kang, Ki Cheol
  • Park, Sung Chul

Dates

Publication Date
20260513
Application Date
20240607

Claims (7)

  1. A DC motor having a multi-phase armature winding coil wired to a stator (100) in an independent and parallel manner, a rotor (200) having multiple permanent magnets (201), and coils wound in parallel according to a pole of the rotor (200), the DC motor comprising: a hollow stator (100) which is provided with a plurality of coil wired parts (110) to be wired in multiple phases; a rotor (200) which is disposed in a hollow portion of the stator (100) and has a shaft (205) provided at a center thereof, into which a plurality of permanent magnets (201) are inserted, and which has a plurality of poles; a coil part (300) wired to the coil wired parts (110) to correspond to the poles of the rotor (200) in parallel; and an encoder module (400) which is connected to be spaced apart from the rotor (200) and changes a supply direction of current according to the poles of the rotor (200), wherein the coil part (300) allows a uniform magnetic force to be applied to the poles of the rotor (200) so that the rotor (200) rotates while noise and vibration are minimized.
  2. The DC motor of claim 1, wherein the rotor (200) includes a central member (250) provided at a center of the rotor (200) and disposed in contact with the permanent magnet (201) inserted into the rotor (200), and the central member (250) is formed of a non-magnetic material and prevents a magnetic field of the permanent magnet (201) from flowing to the shaft (205).
  3. The DC motor of claim 1, wherein the rotor (200) includes: an air gap (260) provided such that an empty space is formed in an end portion of the permanent magnet (201) inserted into the rotor (200); and a shielding member (261) stacked in the air gap (260) and made of a non-magnetic material, and the air gap (260) and the shielding member (261) allow a magnetic field area of the permanent magnet (201) to extend to an outer space of the rotor (200) so that magnetic forces of the permanent magnet (201) and the coil part (300) strongly repel each other.
  4. The DC motor of claim 1, wherein the coil part (200) includes a plurality of coil bundles (301) which are connected to each other in parallel, and the coil bundles (301) are connected to the poles of the rotor (200) in parallel.
  5. The DC motor of claim 4, wherein the coil bundles (301) are provided with the same number of turns and have the same resistance value so that a uniform magnetic force is applied to the poles of the rotor (200).
  6. The DC motor of claim 1, wherein the encoder module (400) includes: a circular encoder board 410 that is fixed in place while fastened to the shaft (205); an encoder wheel (420) disposed on one surface of the encoder board (410) and connected to the shaft (205) to rotate; and a sensing unit (430) installed on the encoder board (410), provided such that one side thereof is seated on one surface of the encoder wheel (420), and configured to detect rotational displacement of the poles.
  7. The DC motor of claim 6, wherein the encoder wheel (420) includes sensing area portions (421) provided by recessing opposite sides of the encoder wheel (420) with respect to a centrifugal center of the encoder board (410), and when the encoder wheel (420) rotates and the sensing area portion (421) is adjacent to the sensing unit (430), the rotational displacement of the poles is detected by the sensing unit (430).

Description

[Technical Field] The present invention relates to a DC motor having a multi-phase armature winding coil wired to a stator in an independent and parallel manner, a rotor having multiple permanent magnets, and coils wound in parallel according to a pole of the rotor, and more particularly, to a DC motor having a multi-phase armature winding coil wired to a stator in an independent and parallel manner, a rotor having multiple permanent magnets, and coils wound in parallel according to a pole of the rotor using coils wired in parallel and wound in a parallel-parallel manner according to each phase and the pole of the rotor. [Background Art] In general, a brushless DC motor is a type of motor in which a voltage is applied from a DC power source via an inverter to an armature winding of a three-phase synchronous motor. This brushless DC motor may perform a reverse operation and regenerative braking without changing connection of a main circuit and is mainly used in a driving environment required at acceleration and deceleration. However, in a brushless DC motor according to the related art, opposite ends of a coil bundle do not correspond to only one pole of a rotor, a magnetic force according to the number of windings of the coil is divided according to the pole, and thus torque of the motor is reduced. Further, when a plurality of coils are wound in series, different resistance values are applied to the respective coils, and thus different magnetic fields are generated, and heat generation and vibration are caused. As the related art document for solving the problem of the motor according to the related art, Korean Patent No. 10-0947172 discloses a generator-integrated permanent magnet motor which includes a plurality of permanent magnet rotors, a ratchet, and a power generation coil and in which a repulsive force is applied in multiple directions depending on a pole. However, even in the related art, it is difficult to maximize the generation of a magnetic field generated in a coil of a stator corresponding to a magnetic field of the rotor. [Detailed Description of Invention] [Technical Problem] The present invention is devised to solve the problem of the related art, and an object thereof is to improve torque and a rotational speed of a motor to correspond to coils wound in parallel according to respective phases and poles of a rotor. [Technical Solution] According to an embodiment of the present invention, a DC motor having a multi-phase armature winding coil wired to a stator in an independent and parallel manner, a rotor having multiple permanent magnets, and coils wound in parallel according to a pole of the rotor includes a hollow stator which is provided with a plurality of coil wired parts to be wired in multiple phases, a rotor which is disposed in a hollow portion of the stator and has a shaft provided at a center thereof, into which a plurality of permanent magnets are inserted, and which has a plurality of poles, a coil part connected to the plurality of poles and provided in parallel, and an encoder module which is connected to be spaced apart from the rotor and changes a supply direction of current according to the poles of the rotor. Further, the coil part allows a uniform magnetic force to be applied to the poles of the rotor connected in parallel so that the rotor rotates while noise and vibration are minimized. [Advantageous Effects] By the means for solving the problem, the present invention has an effect of improving torque of a motor by connecting a plurality of coils in parallel and further connecting the coils and poles of a rotor in parallel such that a uniform magnetic field corresponds to a single pole. Further, the present invention has an effect of minimizing heat generation, vibration, and noise generated when the motor is driven by allowing a uniform magnetic field to correspond to the poles of the rotor through the coils connected in parallel. [Description of Drawings] FIG. 1 is a schematic diagram of coils connected in series in a motor according to the related art.FIG. 2 is a schematic diagram illustrating a state in which the coils connected in series in the motor according to the related art are connected in parallel according to polarity of a rotor.FIG. 3 is a schematic diagram illustrating a state in which a coil part is wired in parallel to a stator of a DC motor according to a first embodiment of the present invention and a rotor having a plurality of polarities is disposed inside the stator.FIG. 4 is a schematic diagram illustrating a state in which the rotor having the plurality of polarities and the coil part corresponding to the rotor are arranged in parallel in the DC motor according to the first embodiment of the present invention.FIG. 5 is a schematic diagram illustrating the rotor into which permanent magnets are inserted and an encoder module connected to a shaft according to the first embodiment of the present invention.FIG. 6 is a view illustrating a state in