Outer electric motor system using iron core

Abstract

The present invention relates to an external-rotor motor system comprising an individual electromagnet configured using an iron core having a specific shape to increase the efficiency of the external-rotor motor, and an external-rotor motor that alternately applies current to individual electromagnet coils arranged at a predetermined angle through a motor control algorithm based on position information regarding the permanent magnet of the external-rotor motor. The external-rotor motor comprises a shaft coupled inside the stator and at least one iron core having a specific shape arranged at a predetermined angle at the end of the stator relative to the transverse direction of the shaft, a magnetizing part forming an individual electromagnet through a forward winding coil and a reverse winding coil wound on each of the iron cores, a position detection part arranged at the same angle as the magnetizing part and detecting the positions of the N and S poles of the permanent magnet arranged at the innermost side of the rotor, an active element that applies power to the magnetizing part, and a motor that alternately applies power to the forward winding coil or the reverse winding coil according to the detection signal of the position detection part. It may include a driver.

Description

Technology Field

[0001] The present invention relates to an external-rotating motor system using an iron core, and more specifically, to a motor system comprising an individual electromagnet configured using an iron core having a shape to increase the efficiency of the external-rotating motor, and a motor control algorithm based on position information of the permanent magnet of the external-rotating motor, wherein current is applied alternately to a forward winding coil and a reverse winding coil included in the individual electromagnet, which are arranged at a predetermined angle or perpendicularly in the circumferential direction. Background Technology

[0003] An electric motor is a mechanical device that converts electrical energy into rotational kinetic energy, a type of mechanical energy, by utilizing the force received within a magnetic field.

[0004] An electric motor consists of a rotor with coils wound around it, brushes that connect the electromagnet current, and a commutator. According to Fleming's left-hand rule, when current flows, the coil receives a force from the magnetic field and rotates.

[0005] At this time, the rotational force is inversely proportional to the number of turns of the coil and the strength of the current flowing through the coil.

[0006] Electric motors can be classified into DC motors (Direct Current Motors) and AC motors (Alternating Current Motors) depending on the type of power source, and AC motors can be divided into synchronous motors (SM) and induction motors (IM) depending on their structure.

[0007] An induction motor has the characteristic of generating an induced current by forming a rotating magnetic field in the stator, and generating torque by the rotor receiving an electromagnetic force and interacting with the magnetic field of the stator.

[0008] In addition, synchronous motors have the characteristic of rotating while maintaining a constant speed and include BLDC (Brushless Direct Current) and PMSM (Permanent Magnet Synchronous Motor).

[0009] BLDC (Brushless Direct Current) is largely composed of a rotor and a stator, and BLDC has the characteristic of increasing durability and reducing heat generation and noise by eliminating the brushes and commutators that wear out during rotation in conventional motors.

[0010] Furthermore, because BLDC can precisely control torque or output high torque, it is widely used across various industries requiring precise movement, such as household products like air conditioners, washing machines, and refrigerators, as well as automobiles, industrial machinery, and robots.

[0011] A PMSM is configured with a structure that does not use a commutator or brushes, just like a BLDC, but while a BLDC uses scalar control to change the magnitude and direction of the current, a PMSM uses space vector control to control the magnitude and direction of the current.

[0012] In addition, PMSMs are characterized by low electromagnetic resistance because they do not use winding coils in the rotor.

[0013] Regarding technologies related to electric motors, Registered Patent Publication No. 10-2101385, Published Patent Publication No. 10-2022-0116212, and Registered Patent Publication No. 10-2677546 are known.

[0014] Registered Patent Publication No. 10-2101385 discloses a technology that enables the lightweighting and efficient manufacturing of a motor while maintaining the same motor torque generation and motor output.

[0015] Published Patent Application No. 10-2022-0116212 discloses a technology that samples the instantaneous angle of a rotor of a BLDC motor through a controller for controlling the level and phase of an input voltage supplied to individual coils, measures the input power for all phases, calculates the modulation level and phase difference values ​​of an inverter corresponding to each input voltage, and supplies them to the inverter.

[0016] Registered Patent Publication No. 10-2677546 discloses a technology that provides an in-wheel motor device capable of improving assembly and performance by configuring the rotor and sun gear as an integrated unit.

[0017] According to the prior art disclosed in Registered Patent Publication No. 10-2101385, Published Patent Publication No. 10-2022-0116212 and Registered Patent Publication No. 10-2677546, a conventional BLDC motor detects the position of a rotating permanent magnet through a Hall sensor and sends a signal to an encoder.

[0018] Then, when the encoder receives a signal and flows current in the forward or reverse direction through two of the three electromagnet coils, rotational torque is applied to the permanent magnet rotor.

[0019] These BLDCs generate heat due to reasons such as magnetic force load, iron loss load, mechanical loss load, and magnetic field load, which causes a loss in rotational output torque.

[0020] In addition, the load force of a conventional rotor is such that high thrust load is applied during rotation because the load energy is transferred to the axis center.

[0021] As such, BLDC motors have problems such as heat generation, complex design and control circuits, high initial costs, and electronic noise.

[0022] As a means to solve the previously described problem, it may be possible to construct a system in which N or S poles are alternately generated from a single iron core by winding forward and reverse coils on the iron core, thereby dispersing the rotor's thrust load outward by arranging electromagnets and permanent magnets at a predetermined angle, facilitating motor control, and increasing motor efficiency. Prior art literature

[0024] Registered Patent Publication No. 10-2101385 (Registration Date: April 9, 2020, Title: Brushless Motor) Published Patent Publication No. 10-2022-0116212 (Publication Date: August 22, 2022, Title: Optimized Brushless DC (BLDC) Motor Drive System) Registered Patent Publication No. 10-2677546 (Registration Date: June 18, 2024, Title: In-wheel Motor Device) The problem to be solved

[0025] Accordingly, the present invention is an invention conceived in accordance with the aforementioned necessity, and the main objective of the present invention is to provide an external rotor type motor system using an iron core that increases output torque efficiency by dispersing the thrust load of the rotor outward by arranging permanent magnets and electromagnets at a predetermined angle, increases output torque through a motor design in which N poles or S poles are alternately generated in a single iron core, and enables a motor driver to easily control the motor through a 2-phase, 4-phase, or 6-phase motor circuit. means of solving the problem

[0027] An external-rotor motor system using an iron core according to an embodiment of the present invention for achieving the aforementioned purpose may include an external-rotor motor in which a stator is disposed inside a rotor, wherein a shaft coupled inside the stator and at least one iron core having a predetermined shape is disposed at a predetermined angle at the end of the stator with respect to the transverse direction of the shaft, a magnetizing part that forms individual electromagnets through a forward winding coil and a reverse winding coil wound on each of the iron cores, a position detection part that detects the positions of a permanent magnet arranged at the innermost side of the rotor and the N pole and S pole of the permanent magnet, an active element that applies power to the magnetizing part, and a motor driver that alternately applies power to the forward winding coil or the reverse winding coil according to the detection signal of the position detection part.

[0028] The external rotor system using the above iron core may further include a housing coupled to both ends of the shaft.

[0029] The above housing may be provided with an air outlet and an intake port on one side of the housing to discharge heat from the magnetization part.

[0030] The above housing may have an insulating resin within the housing.

[0031] The external rotor system using the above iron core may further include a cooling module for cooling the heat generated from the individual electromagnets.

[0032] The above cooling module may include a cooling tank disposed inside the stator to cool the body of the stator.

[0033] The shaft may further include a refrigerant intake port and a refrigerant discharge port for supplying and discharging refrigerant to the cooling tank.

[0034] The above cooling module may be characterized by supplying refrigerant from the refrigerant intake port of the shaft to the cooling tank, cooling the stator through the supplied refrigerant, and then discharging the refrigerant through the refrigerant outlet.

[0035] The above iron core may be characterized by being constructed using one of a U-shape, a T-shape, and a circle.

[0036] The above iron core may be characterized by increasing the effective contact area of ​​the flowing air of the individual electromagnet and increasing the heat dissipation area of ​​the individual electromagnet.

[0037] The above C-shaped iron core may be characterized by winding one enamel coil on one side of the C-shaped iron core or winding two enamel coils on both ends of the C-shaped iron core, the above T-shaped iron core may be characterized by winding one enamel coil on a straight section of the T-shaped iron core, and the above circular iron core may be characterized by winding one enamel coil on one side of the circular iron core.

[0038] The individual electromagnets are arranged at an angle ranging from 0 to 60 degrees relative to the transverse direction of the shaft at the stator end, and at least one may be arranged in the circumferential direction of the stator.

[0039] The above magnetization unit may feature individual electromagnets that form an N pole or a S pole on one of the iron cores.

[0040] The magnetization unit may be characterized by forming an N-pole electromagnet through the forward winding coil and forming an S-pole electromagnet through the reverse winding coil.

[0041] To prevent the generation of back EMF, diodes may be installed in the forward winding coil and the reverse winding coil.

[0042] The above position detection unit may have at least one NPN sensor on one side of the housing to detect the N pole of the permanent magnet, and at least one PNP sensor on one side of the housing to detect the S pole of the permanent magnet.

[0043] The above position detection unit can detect the N and S poles of the permanent magnet when the permanent magnet rotates in the rotational direction of the rotor, at the position detection unit reaching the 2 / 3 or 1 / 2 point of the forward coil and reverse coil wound on the iron core.

[0044] The above active element may be characterized by being installed in at least one way to apply power to the magnetization part.

[0045] The above active device may be composed of a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor).

[0046] The motor driver may be characterized by controlling the operation of at least one active element based on the position of a permanent magnet detected by at least one NPN sensor and a PNP sensor.

[0047] The motor driver can apply power to the forward winding coil through the active element according to the detection signal when the NPN sensor detects the N pole of the permanent magnet, or apply power to the reverse winding coil through the active element according to the detection signal when the PNP sensor detects the S pole of the permanent magnet.

[0048] The motor driver described above may be characterized by supplying rotational force to the rotor by alternately applying power to the forward winding coil or the reverse winding coil through the active element based on the position of the N pole or S pole of the permanent magnet detected by the position detection unit.

[0049] Specific details of other embodiments are included in the detailed description and drawings. Effects of the invention

[0051] According to the means for solving the technical problem described above, the external rotor type motor system using an iron core according to an embodiment of the present invention has the following advantages.

[0052] First, an external rotor motor system using an iron core can form N and S poles in each iron core by alternately applying power to the forward coil and the reverse coil wound on each iron core.

[0053] Second, the external rotor motor system using an iron core can improve performance by approximately 35% to 40% compared to the rotational RPM of a conventional BLDC motor by arranging individual electromagnets at a predetermined angle relative to the transverse direction of the shaft.

[0054] Third, an external rotor motor system using an iron core can reduce rotational torque loss by lowering heat generation in the rotor and stationary bodies using non-metallic non-magnetic materials and cooling channels.

[0055] Fourth, an external-rotor motor system using an iron core can obtain high torque by controlling the voltage (V) and current (A) through a motor driver that controls the voltage, current, and magnetic flux with a sine wave in a 2-phase, 4-phase, or 6-phase motor circuit, thereby changing once in a 180-degree phase and twice in a 360-degree phase in one cycle. Brief explanation of the drawing

[0057] Figure 1 shows an external rotor motor system using an iron core. Figure 2 shows an exploded perspective view of an external rotor motor system using an iron core. Figure 3 shows a stator coupled to a shaft. Figure 4 shows a rotor. Figure 5 shows an external rotor motor composed of individual circular electromagnets arranged at a predetermined angle. Figure 6 shows a stator composed of individual circular electromagnets arranged at a predetermined angle. Figure 7 shows a rotor composed of permanent magnets arranged at a predetermined angle. Figure 8 shows an external rotor motor composed of individual circular electromagnets arranged vertically in the circumferential direction. Figure 9 shows a stator composed of individual circular electromagnets arranged perpendicularly in the circumferential direction. Figure 10 shows a rotor composed of permanent magnets arranged perpendicularly in the circumferential direction. FIG. 11 shows an external rotor motor composed of individual T-shaped electromagnets arranged at a predetermined angle. FIG. 12 shows a stator composed of individual T-shaped electromagnets arranged at a predetermined angle. FIG. 13 shows a rotor composed of permanent magnets arranged at a predetermined angle. FIG. 14 shows an external rotor motor composed of individual T-shaped electromagnets arranged vertically in the circumferential direction. Figure 15 shows a stator composed of individual T-shaped electromagnets arranged vertically in the circumferential direction. Figure 16 shows a rotor composed of permanent magnets arranged perpendicularly in the circumferential direction. FIG. 17 shows an external rotor motor composed of individual C-shaped electromagnets arranged at a predetermined angle. FIG. 18 shows a stator composed of individual C-shaped electromagnets arranged at a predetermined angle. FIG. 19 shows a rotor composed of permanent magnets arranged at a predetermined angle. FIG. 20 shows an external rotor motor composed of individual C-shaped electromagnets arranged vertically in the circumferential direction. Figure 21 shows a stator composed of individual C-shaped electromagnets arranged vertically in the circumferential direction. FIG. 22 shows a rotor composed of permanent magnets arranged perpendicularly in the circumferential direction. Figure 23 shows a shaft. Figure 24 shows a cooling tank placed inside the stator. Figure 25 shows a rubber packing of a cooling tank installed to prevent refrigerant leakage. Figure 26 shows a cooling tank coupled to a shaft. Figure 27 shows the installation angles of individual electromagnets and permanent magnets. Figure 28 shows the air gap between individual electromagnets and permanent magnets. FIG. 29 shows a forward coil and a reverse coil wound on an iron core. Figure 30 shows a sinusoidal control method for an external rotor motor system using an iron core. Figure 31 shows the square wave of a conventional BLDC. Figure 32 shows a sinusoidal wave indicating the position of the permanent magnet sensing sensor of an external type motor system in a conventional BLDC sinusoidal wave. Figure 33 shows the sine wave and magnetic cycle of an external rotor motor system using an iron core. FIG. 34 illustrates the first operation method of the motor driver. FIG. 35 illustrates a second operation method of the motor driver. Figure 36 shows the third operation method of the motor driver. FIG. 37 illustrates the fourth operation method of the motor driver. Figure 38 shows the first line diagram for the signal current of the motor driver. Figure 39 shows a second line diagram for the signal current of the motor driver. Figure 40 shows a single-pole, single-signal, single-circuit type external rotor system using an iron core. Figure 41 shows a single-pole two-signal one-line circuit of an external-rotor type motor system using an iron core. FIG. 42 shows the first operation of a 2-pole 2-signal 1-circuit of an external rotor type motor system using an iron core. FIG. 43 shows the second operation of a 2-pole 2-signal 1-circuit of an external rotor type motor system using an iron core. FIG. 44 shows the first operation of a single-pole two-signal two-circuit type motor system using an iron core. FIG. 45 shows the second operation of a single-pole two-signal two-circuit type motor system using an iron core. FIG. 46 shows the third operation of a single-pole two-signal two-circuit type motor system using an iron core. FIG. 47 shows the first operation of a three-phase three-sensor of an external rotor type motor system using an iron core. FIG. 48 shows the second operation of a three-phase three-sensor of an external-rotor motor system using an iron core. FIG. 49 shows the first operation of a 4-phase 4-sensor of an external rotor type motor system using an iron core. FIG. 50 shows the second operation of a 4-phase 4-sensor of an external rotor type motor system using an iron core. Specific details for implementing the invention

[0058] The following detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced, in order to clarify the objects, technical, solutions, and advantages of the invention. These embodiments are described in sufficient detail to enable a person skilled in the art to practice the invention. Furthermore, throughout the detailed description and claims of the invention, the word "comprising" and its variations are not intended to exclude other technical features, additions, components, or steps. Other objects, advantages, and characteristics of the invention will become apparent to a person skilled in the art, in part from this description and in part from the practice of the invention. The following examples and drawings are provided as examples and are not intended to limit the invention. Moreover, the invention encompasses all possible combinations of the embodiments shown herein. It should be understood that various embodiments of the invention are different but need not be mutually exclusive. It should also be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. Accordingly, the following detailed description is not intended to be taken in a limiting sense, and the scope of the invention is limited only by the appended claims, including all equivalents thereof, provided they are appropriately described. Furthermore, unless otherwise indicated in this specification or clearly contradictory to the context, items referred to in the singular encompass the plural unless otherwise required by the context. Additionally, in describing the invention, if it is determined that a detailed description of related known components or functions could obscure the essence of the invention, such detailed description will be omitted.

[0059] Figure 1 shows an external rotor motor system using an iron core, Figure 2 shows an exploded perspective view of an external rotor motor system using an iron core, Figure 3 shows a stator coupled to a shaft, and Figure 4 shows a rotor.

[0060] Referring to FIGS. 1 and FIGS. 4, an external type motor system (100) using an iron core can have a stator (10) placed inside a rotor (20).

[0061] An external type motor system (100) using an iron core may include a shaft (110), a housing (120), a magnetizing unit (130), a cooling module (140), a permanent magnet (150), a position detection unit (160), an active element (170), and a motor driver (180).

[0062] As can be seen in FIG. 2, the structure of the external type motor system (100) using an iron core first has a shaft (110) coupled inside a stator (10) including a magnetizing part (130).

[0063] Next, a housing (120) is attached to each end of the shaft (110), and the housing (120) attached to both ends of the shaft (110) is attached to the innermost side of the bearing (30).

[0064] The bearing (30) of the external type motor system (100) using an iron core according to an embodiment of the present invention is configured using a ball bearing, but is not limited thereto, and the bearing (30) may use various bearings such as ball bearings and roller bearings.

[0065] Next, a housing cover (121) is attached to one side of the bearing (30), and a rotor (20) including a permanent magnet (150) is attached to the outermost side of the bearing (30). At this time, the rotor (20) is attached to the bearing (30) with an air gap (50) between it and the stator (10).

[0066] The gap (50) according to an embodiment of the present invention refers to a certain distance between the stator (10) and the rotor (20) that allows the rotor (20) to rotate smoothly, and a detailed description of the gap (50) is to be described in FIG. 28.

[0067] The shaft (110) includes a refrigerant intake port (111) and a refrigerant discharge port (112) for supplying and discharging refrigerant to a cooling tank. A detailed description of the shaft (110) according to an embodiment of the present invention will be described in FIG. 23.

[0068] The housing (120) can be coupled to both ends of the shaft (110), and the housing (120) may be provided with an air outlet and an air intake on one side of the housing (120) to discharge heat from the magnetization part (130).

[0069] According to an embodiment of the present invention, the housing (120) may have an insulating resin inside the housing to prevent residual current from being discharged to the outside.

[0070] The magnetization unit (130) may have at least one iron core (131-1) having a predetermined angle (40) and shape or an iron core (131-1) arranged vertically in the circumferential direction arranged at the end of the stator (10) based on the transverse direction of the shaft (110), and the magnetization unit (130) may form individual electromagnets (131) through a forward winding coil (131-2) and a reverse winding coil (131-3) wound on each iron core (131-1).

[0071] According to an embodiment of the present invention, the material of the stator (10) of an external type motor system (100) using an iron core is a non-metallic non-magnetic material, so that the heating of the stator (10) and the generation of current magnetism caused by the magnetic field of the permanent magnet (150) can be minimized.

[0072] At this time, the non-metallic non-magnetic material includes, but is not limited to, Bekrite, glass fiber, epoxy, and ceramic, and the stator (10) material may be composed of various non-metallic non-magnetic materials.

[0073] Although it is described that the stator (10) material of the external type motor system (100) using an iron core according to one embodiment of the present invention is composed of a non-metallic non-magnetic material, the stator (10) material may also be composed of a metallic non-magnetic material such as aluminum, brass, zinc, alloy, or stainless steel depending on the heat resistance design and mechanical strength improvement of the stator (10).

[0074] Since the individual electromagnet (131) is equipped with a forward winding coil (131-2) and a reverse winding coil (131-3) wound on a single iron core (131-1), when current is applied to the individual electromagnet (131), the individual electromagnet (131) can form an N pole or a S pole.

[0075] The cooling module (140) can cool the heat generated from individual electromagnets (131) using a cooling tank placed inside the stator (10).

[0076] A detailed description of the cooling module (140) will be described in FIGS. 23 to 26.

[0077] The permanent magnet (150) is arranged at the innermost side of the rotor (20), and the permanent magnet (150) can be positioned at the same angle (40) with an air gap (50) between it and the individual electromagnet (131) of the magnetization part (130).

[0078] According to an embodiment of the present invention, the material of the rotor (20) may be composed using at least one of a non-metallic non-magnetic material such as vekrite, glass fiber, epoxy, and ceramic, and a metallic non-magnetic material such as aluminum, brass, zinc, alloy, and stainless steel.

[0079] The position detection unit (160) can detect the positions of the N pole and S pole of the permanent magnet (150) when the rotor (20) rotates, and the position detection unit (160) may have at least one NPN sensor to detect the N pole of the permanent magnet (150), and the position detection unit (160) may have at least one PNP sensor to detect the S pole.

[0080] When the permanent magnet (150) placed on the rotor (20) rotates, the position detection unit (160) can detect the N pole or S pole of the permanent magnet (150) reaching the 2 / 3 or 1 / 2 point of the individual electromagnet (131).

[0081] The active device (170) may include one of a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or an IGBT (Insulated Gate Bi-polar Transistor) to apply power to the magnetization part (130).

[0082] According to an embodiment of the present invention, the active element (170) of the external type motor system (100) using an iron core is described using an IGBT element, but is not limited thereto, and the active element (170) may also use a transistor including a MOSFET and a BJT.

[0083] The motor driver (180) may be characterized by activating the active element (170) according to the detection signal of the position detection unit (160) to alternately apply power to the forward winding coil (131-2) or the reverse winding coil (131-3) of the magnetization unit (130).

[0084] According to an embodiment of the present invention, the motor driver (180) can supply voltage to B (Base) of the active element (170) IGBT based on the position of the permanent magnet (150) detected by the NPN sensor and PNP sensor of the position detection unit (160), thereby causing current to flow from C (Collector) to E (Emitter) and supply power to the forward winding coil (131-2) or the reverse winding coil (131-3).

[0085] Additionally, the motor driver (180) can stop supplying voltage to B (Base) of at least one active element (170) IGBT to prevent current from flowing from C (Collector) to E (Emitter), thereby cutting off power supply to the forward winding coil (131-2) or the reverse winding coil (131-3).

[0086] At this time, a diode is installed in the coil to prevent the generation of back electromotive force flowing into the forward winding coil (131-2) or the reverse winding coil (131-3), thereby preventing the reverse flow of current.

[0087] The motor driver (180) controls the operation of at least one active element (170) based on the position of the permanent magnet (150) detected by at least one NPN sensor and a PNP sensor, thereby alternately supplying power to the forward winding coil (131-2) or the reverse winding coil (131-3), so that the direction of the magnetic flux (Φ) of the electromagnet can be forward or reverse.

[0088] Additionally, by supplying power to the forward winding coil (131-2) or the reverse winding coil (131-3) through the motor driver (180), the sinusoidal wave changes once in a 180-degree phase in one cycle and changes twice in a 360-degree phase in one cycle due to the attractive or repulsive force on the N or S pole of the permanent magnet (150), and the rotor (20) has rotational torque.

[0089] FIG. 5 shows an external-rotor motor composed of individual circular electromagnets arranged at a predetermined angle; FIG. 6 shows a stator composed of individual circular electromagnets arranged at a predetermined angle; FIG. 7 shows a rotor composed of permanent magnets arranged at a predetermined angle; FIG. 8 shows an external-rotor motor composed of individual circular electromagnets arranged perpendicularly in the circumferential direction; FIG. 9 shows a stator composed of individual circular electromagnets arranged perpendicularly in the circumferential direction; FIG. 10 shows a rotor composed of permanent magnets arranged perpendicularly in the circumferential direction; FIG. 11 shows an external-rotor motor composed of individual T-shaped electromagnets arranged at a predetermined angle; FIG. 12 shows a stator composed of individual T-shaped electromagnets arranged at a predetermined angle; FIG. 13 shows a rotor composed of permanent magnets arranged at a predetermined angle; FIG. 14 shows an external-rotor motor composed of individual T-shaped electromagnets arranged perpendicularly in the circumferential direction; and FIG. 15 shows an external-rotor motor arranged perpendicularly in the circumferential direction Figure 16 shows a stator composed of T-shaped individual electromagnets, Figure 17 shows an external rotor composed of C-shaped individual electromagnets arranged at a predetermined angle, Figure 18 shows a stator composed of C-shaped individual electromagnets arranged at a predetermined angle, Figure 19 shows a rotor composed of permanent magnets arranged at a predetermined angle, Figure 20 shows an external rotor composed of C-shaped individual electromagnets arranged at a predetermined angle, Figure 21 shows a stator composed of C-shaped individual electromagnets arranged at a predetermined angle, and Figure 22 shows a rotor composed of permanent magnets arranged at a predetermined angle.

[0090] Referring to FIGS. 5 to 22, an external type motor system (100) using an iron core can have the iron core (131-1) of an individual electromagnet (131) configured in various shapes.

[0091] The individual electromagnet (131) of the magnetization unit (130) can be configured by using a forward winding coil (131-2) and a reverse winding coil (131-3) on an iron core having a single shape.

[0092] At this time, the iron core (131-1) can be configured using one of the shapes of a circle, a U-shape, or a T-shape.

[0093] According to an embodiment of the present invention, an external type motor system (100) using an iron core is configured with an iron core (131-1) using a shape such as a circle, a U-shape, or a T-shape, but is not limited thereto, and the iron core (131-1) can be configured using various shapes such as an E-shape or an O-shape.

[0094] Through these various shapes of the iron core (131-1), the effective contact area of ​​the air flowing through the individual electromagnet inside the external type motor is increased, and the heat dissipation area of ​​the individual electromagnet (131) is increased, thereby allowing the heat generated inside the external type motor to be efficiently cooled.

[0095] In addition, by using various shapes of the iron core (133-1), the hysteresis loss caused by eddy currents generated in the iron core can be reduced, thereby increasing the efficiency of the external rotor motor by about 7~8%.

[0096] According to one embodiment of the present invention, an external-rotor motor system (100) using an iron core may include an external-rotor motor (101-a) composed of circular individual electromagnets (131) arranged at a predetermined angle and an external-rotor motor (101-b) composed of circular individual electromagnets (131) arranged vertically in the circumferential direction.

[0097] An external type motor (101-a) composed of circular individual electromagnets (131) arranged at a predetermined angle may include a stator (11-a) composed of circular individual electromagnets (131) arranged at a predetermined angle and a rotor (21-a) composed of permanent magnets (150) arranged at a predetermined angle.

[0098] An external type motor (101-b) composed of circular individual electromagnets (131) arranged vertically in the circumferential direction may include a stator (11-b) composed of circular individual electromagnets (131) arranged vertically in the circumferential direction and a rotor (21-b) composed of permanent magnets (150) arranged vertically in the circumferential direction.

[0099] Additionally, the external rotor motor system (100) using an iron core may include an external rotor motor (102-a) composed of T-shaped individual electromagnets (131) arranged at a predetermined angle and an external rotor motor (102-b) composed of T-shaped individual electromagnets (131) arranged vertically in the circumferential direction.

[0100] An external type motor (102-a) composed of T-shaped individual electromagnets (131) arranged at a predetermined angle may include a stator (12-a) composed of T-shaped individual electromagnets (131) arranged at a predetermined angle and a rotor (22-a) composed of permanent magnets (150) arranged at a predetermined angle.

[0101] An external type motor (102-b) composed of T-shaped individual electromagnets (131) arranged vertically in the circumferential direction may include a stator (12-b) composed of T-shaped individual electromagnets (131) arranged vertically in the circumferential direction and a rotor (22-b) composed of permanent magnets (150) arranged vertically in the circumferential direction.

[0102] Additionally, the external rotor motor system (100) using an iron core may include an external rotor motor (103-a) composed of individual C-shaped electromagnets (131) arranged at a predetermined angle and an external rotor motor (103-b) composed of individual C-shaped electromagnets (131) arranged vertically in the circumferential direction.

[0103] An external type motor (103-a) composed of individual C-shaped electromagnets (131) arranged at a predetermined angle may include a stator (13-a) composed of individual C-shaped electromagnets (131) arranged at a predetermined angle and a rotor (23-a) composed of permanent magnets (150) arranged at a predetermined angle.

[0104] An external type motor (103-b) composed of individual C-shaped electromagnets (131) arranged vertically in the circumferential direction may include a stator (13-b) composed of individual C-shaped electromagnets (131) arranged vertically in the circumferential direction and a rotor (23-b) composed of permanent magnets (150) arranged vertically in the circumferential direction.

[0105] FIG. 23 shows a shaft, FIG. 24 shows a cooling tank placed inside a stator, FIG. 25 shows a rubber packing of a cooling tank installed to prevent refrigerant leakage, and FIG. 26 shows a cooling tank coupled to a shaft.

[0106] Referring to FIGS. 23 to 26, the cooling module (140) can cool individual electromagnets (131) using a cooling tank (141) placed inside the stator (10).

[0107] As can be seen in FIG. 23, the shaft (110) may be configured with a pipe connected to a refrigerant intake port (111) or a refrigerant outlet (112) inside the shaft (110) in a left-right symmetrical manner, or the shaft (110) may be configured with a pipe connected to a refrigerant intake port (111) or a refrigerant outlet (112) inside the shaft (110) on at least one side of the left side or the right side.

[0108] As can be seen in FIGS. 24 to 26, the cooling tank (141) is positioned inside the stator (10), and a rubber packing (143) may be provided at the joint between the shaft (110) of the cooling tank cover (142) and the cooling tank (141) so that refrigerant does not leak out from both sides of the cooling tank (141) positioned inside the stator (10).

[0109] According to one embodiment of the present invention, to prevent refrigerant leakage from the cooling channel (142), the cooling tank (141) and the cooling tank cover (142) may be treated with a waterproof ceramic coating, and the refrigerant intake port (111) and the refrigerant outlet (112) may be made of a material such as a metal, ceramic, or polymer having high thermal conductivity.

[0110] Due to this ceramic coating, the cooling tank (141) and the cooling tank cover (142) can maintain durability even at high temperatures, thereby increasing their lifespan.

[0111] In addition, the refrigerant material used in the refrigerant may be composed of gases such as Freon ammonia or cooling fluids such as cooling oils and liquids, but is not limited thereto.

[0112] The cooling module (140) supplies refrigerant from the outside to the cooling tank (141) from the refrigerant intake port (111) of the shaft (110) located on the inner side of the stator (10), and after the supplied refrigerant cools the stator (10), the refrigerant can be discharged through the refrigerant discharge port (112).

[0113] According to an embodiment of the present invention, a temperature sensor is provided in the stator (10), and when the cooling module (140) detects that the temperature exceeds a set temperature range, the circulation speed of the refrigerant can be adjusted to cool the stator (10).

[0114] Figure 27 shows the installation angles of individual electromagnets and permanent magnets, Figure 28 shows the air gaps of individual electromagnets and permanent magnets, and Figure 29 shows the forward coil and reverse coil wound on an iron core.

[0115] Referring to FIGS. 27 to 29, individual electromagnets (131) and permanent magnets (150) can be arranged at a predetermined angle (40) with respect to the transverse direction of the shaft.

[0116] As can be seen in FIG. 27, individual electromagnets (131) of the magnetization unit (130) are arranged at the end of the outer diameter of the stator (10) at a predetermined angle (40) including 0 to 60 degrees with respect to the transverse direction of the shaft (110), and at least one may be arranged in the circumferential direction of the stator (10).

[0117] According to an embodiment of the present invention, experimental results showed that the highest output torque was generated when the individual electromagnet (131) of the external type motor system (100) using an iron core placed at the end of the stator (10) was positioned at 45 degrees.

[0118] Therefore, individual electromagnets (131) and permanent magnets (150) arranged at a predetermined angle have been described as an external type motor system (100) using an iron core with the arrangement angle set to 45 degrees, but this is not limited thereto.

[0119] The permanent magnet (150) of the rotor (20) is positioned in the inner diameter of the rotor (20) at the same angle (40) as the individual electromagnet (131), and as can be seen in FIG. 28, the individual electromagnet (131) and the permanent magnet (150) can be positioned parallel to each other with an air gap (50).

[0120] According to an embodiment of the present invention, when individual electromagnets (131) and permanent magnets (150) are arranged at a predetermined angle (40) around a shaft (110), the load of the force of the rotating rotor (20) can be distributed outward, thereby reducing the load on the center of the shaft.

[0121] Simply put, since a larger moment of inertia requires more force to rotate or stop an object, in order to reduce the moment of inertia, the moment of inertia can be reduced through the attractive and repulsive forces generated between the individual electromagnet (131) and the permanent magnet (150) arranged at the same angle as the permanent magnet (150) and the permanent magnet (150) arranged at the outermost surface of the rotor (20), thereby increasing the efficiency of the electric motor.

[0122] When current is passed through the forward winding coil (131-2) and the reverse winding coil (131-3) wound on the iron core, the individual electromagnet (131) outputs an N pole, and when current is passed through the reverse winding coil (131-3), the individual electromagnet (131) can output an S pole.

[0123] Thus, the external type motor system (100) using an iron core (131-1) can output an N pole or a S pole by using a forward winding coil (131-2) and a reverse winding coil (131-3) wound on a single individual electromagnet (131), and for this purpose, the process of forming the individual electromagnet (131) of the magnetization unit (130) is as follows.

[0124] First, the wound forward coil (131-2) and reverse coil (131-3) are placed into an iron core (131-1) made of silicon steel plate and fixed, and then the inlet portion of the coil is compressed and welded.

[0125] Afterwards, the forward winding coil (131-2) and the reverse winding coil (131-3) are placed in enamel liquid and impregnated.

[0126] According to an embodiment of the present invention, the method of winding an enamel coil in a forward or reverse direction depending on the shape of the iron core (131-1) is as follows.

[0127] First, the C-shaped iron core can have one enamel coil wound on one side of the C-shaped iron core, or two enamel coils wound on both ends of the C-shaped iron core.

[0128] Next, the T-shaped iron core can wind one enamel coil in the straight section of the T-shaped iron core.

[0129] Next, one enamel coil can be wound on one side of the circular iron core.

[0130] The enamel coil winding method of a C-shaped, T-shaped, or circular iron core according to one embodiment of the present invention described above represents a winding method for one of the forward or reverse directions.

[0131] At this time, the enamel coil used may be an AIW bonding coil or an EIW coil, but is not limited thereto.

[0132] The forward coil (131-2) and reverse coil (131-3) can increase the magnetic force and reduce heat generation by winding thin coils of 0.025 mm multiple times, thereby increasing the current resistance value of the iron core and reducing heat generation.

[0133] According to an embodiment of the present invention, the thickness of the coil and the number of turns may vary depending on the capacity of the motor, and depending on the capacity of the motor, the motor can be classified into ultra-small, small, medium, and large sizes.

[0134] Since the magnetic field of the coil must generate a magnetic force of at least 1:1 or 1.1:1 compared to the magnetic field of the permanent magnet, when configuring the motor according to the capacity, the permanent magnet (150) must be measured using a magnetic force density meter (permanent magnet Gauss meter), and the thickness of the coil and the number of turns of the coil must be set so that the value is greater than or equal to the Gauss value of the permanent magnet (150).

[0135] In particular, when configuring an electric motor that requires high voltage, thin coils may be used to minimize heat generation in the coils, or additional cooling design may be required when using thick coils.

[0136] As such, the coil must be selected according to the characteristics of the electric motor, and typically, a circular coil or a flat coil can be used.

[0137] Afterwards, the impregnated forward and reverse coils are dried in a hot and cold air blower.

[0138] After repeating this process at least once, the forward winding coil (131-2) and the reverse winding coil (131-3) insert individual electromagnets (131) into the stator (10) and arrange the individual electromagnets (131) in a circumferential direction and fix them with bolts.

[0139] At this time, the spacing of the individual electromagnets (131) is described as being set to at least 1.5 mm, but is not limited thereto, and the spacing of the individual electromagnets (131) can be configured differently depending on the standard capacity characteristics of the product.

[0140] In order to reduce energy loss and obtain a high rotational output torque, the magnetic force density of the individual electromagnets (131) according to the embodiment of the present invention must be higher than the magnetic force density of the permanent magnet (150).

[0141] Therefore, by applying current after winding and using a magnetic density meter to measure whether the magnetic density of the individual electromagnet (131) is higher than the magnetic density of the permanent magnet (150), the individual electromagnet (131) can be configured by combining the individual electromagnet (131) so that its magnetic density is higher than the magnetic density of the permanent magnet (150).

[0142] Additionally, the user may set the value of the gap (50) between the individual electromagnet (131) and the permanent magnet (150) based on the result of measuring the magnetic density of the individual electromagnet (131) and the permanent magnet (150) using a magnetic density meter.

[0143] According to an embodiment of the present invention, the magnetic field density measurement value for an iron core having the shape of an external type motor system (100) using an iron core is as follows.

[0145] division coil Coil turns Resistance value (KΩ) Voltage (DCV) Current (A) Electromagnet Gauss Neodymium Gauss C-shaped angle 0.2mm 5,000(right)5,000(left) 168 120 1.60 83,136 26,850 108 1.44 74,868 96 1.28 66,527 84 1.12 58,186 72 0.96 49,904 60 0.80 41,527 48 0.64 33,145 36 0.48 24,953 24 0.32 16,638 12 0.16 8,319 U-shaped predetermined angle 0.2mm 5,000(right)5,000(left) 168 120 1.60 83,136 26,850 109 1.44 74,868 96 1.28 66,527 84 1.12 58,186 72 0.96 49,904 60 0.80 41,527 48 0.64 33,145 36 0.48 24,953 24 0.32 16,638 12 0.16 8,319 T-shaped angle 0.2mm 10,000 168 120 1.69 41,568 26,850 102 1.49 37,434 96 1.34 33,263 84 1.17 29,093 72 1.02 24,952 60 0.85 20,763 48 0.66 16,572 36 0.50 12,476 24 0.34 8,319 12 0.16 4,159 T-shaped predetermined angle 0.2mm 10,000 168 120 1.69 41,568 26,850 102 1.49 37,434 96 1.34 33,263 84 1.17 29,093 72 1.02 24,952 6 0 0.85 20,763 48 0.66 16,572 36 0.50 12,476 24 0.34 8,319 12 0.16 4,159

[0146] (Table 1. Magnetic Density Measurement Table by Iron Core)

[0147] In this case, magnetic density is defined as magnetic flux divided by area, and the unit of magnetic density can be expressed as Gauss (G). The Gauss formula is as follows.

[0148]

[0149] In the above formula, T represents the unit of magnetic flux density in Tesla, and Wb represents the unit of magnetic flux in Weber; Gauss and Tesla can be expressed as 1T = 10,000G and 1G = 0.0001T.

[0150] The rotor (20) has N and S poles of permanent magnets (150) arranged alternately in the circumferential direction on the inner diameter surface of the rotor (20), and the distance between the permanent magnets (150) is spaced at least 1.5 mm apart, which is the same as the distance between individual electromagnets (131).

[0151] According to an embodiment of the present invention, the permanent magnet (150) may be constructed using neodymium or samarium cobalt, but is not limited thereto and may be constructed using various materials having magnetic properties.

[0152] In addition, after arranging permanent magnets (150) on the rotor (20), the rotor (20) is rotated at high speed to measure and adjust the balance of the rotor (20), thereby preventing problems such as bearing (30) wear and vibration during high-speed rotation.

[0153] FIG. 30 illustrates a sinusoidal control method for an external-rotor motor system using an iron core, FIG. 31 illustrates a square wave of a conventional BLDC, FIG. 32 illustrates a sinusoidal wave indicating the position of a permanent magnet detection sensor of an external-rotor motor system in the sinusoidal wave of a conventional BLDC, FIG. 33 illustrates a sinusoidal wave and magnetic cycle of an external-rotor motor system using an iron core, FIG. 34 illustrates a first operation method of a motor driver, FIG. 35 illustrates a second operation method of a motor driver, FIG. 36 illustrates a third operation method of a motor driver, FIG. 37 illustrates a fourth operation method of a motor driver, FIG. 38 illustrates a first line diagram for the signal current of a motor driver, FIG. 39 illustrates a second line diagram for the signal current of a motor driver, FIG. 40 illustrates a single-pole, single-signal, single-circuit of an external-rotor motor system using an iron core, and FIG. 41 illustrates an external-rotor motor using an iron core FIG. 42 shows the first operation of the two-pole two-signal one-circuit of the external-rotating motor system using an iron core, FIG. 43 shows the second operation of the two-pole two-signal one-circuit of the external-rotating motor system using an iron core, FIG. 44 shows the first operation of the two-pole two-signal two-circuit of the external-rotating motor system using an iron core, FIG. 45 shows the second operation of the two-pole two-signal two-circuit of the external-rotating motor system using an iron core, and FIG. 46 shows the third operation of the two-pole two-signal two-circuit of the external-rotating motor system using an iron core.

[0154] Referring to FIGS. 30 to 46, a motor driver (180) can alternately apply power to a forward winding coil (131-2) and a reverse winding coil (131-3) to generate rotational torque of the rotor (20).

[0155] Conventional BLDC motors detect rotating permanent magnets by installing a sensor between the iron core slots and the gap between the slots, and based on the position of the permanent magnets, conventional BLDC motors can control the encoder signal current cycle.

[0156] That is, as can be seen in FIGS. 31 and 32, a conventional BLDC motor can rotate a rotor through a magnetic field and sinusoidal phenomenon in an iron core by using an encoder and a position sensor that control the sine wave of a 2-pole 3-phase voltage (V) and current (I) to rotate and flow current through the motor in alternating rotation of two of the 3 phases.

[0157] In contrast, when the NPN sensor of the external type motor system (100) using an iron core detects the N pole of the permanent magnet (150), the motor driver (180) can apply power to the forward winding coil (131-2) by controlling the operation of the active element (170) according to the detection signal, or when the PNP sensor detects the S pole of the permanent magnet (150), the motor driver (180) can apply power to the reverse winding coil (131-3) by controlling the operation of the active element (170) according to the detection signal.

[0158] At this time, as can be seen in FIGS. 30, 32 and 33, the external type motor system (100) using an iron core can detect the N pole or S pole by installing the NPN sensor or PNP sensor of the position detection unit (160) at a position of 60 degrees pulled by 30% from the 90-degree phase of the sinusoidal wave of a conventional BLDC motor.

[0159] Thus, the motor driver (180) of the external type motor system (100) using an iron core can supply rotational force to the rotor (20) by alternately applying power to the forward winding coil (131-2) or the reverse winding coil (131-3) through the active element (170) based on the position of the N pole or S pole of the permanent magnet (150) detected by the position detection unit (160).

[0160] According to an embodiment of the present invention, an external type motor system (100) using an iron core can exhibit performance as shown in Table 2 compared to conventional motors.

[0162] Comparison items External rotor motor system using an iron core Existing AC Existing BLDC Existing PMSM BLDC Motor structure simplicity simplicity complication Very complex voltage AC ⇒ DC Conversion / DC Exchange AC ⇒ DC conversion AC ⇒ DC Conversion / DC electric current DC AC DC DC Frequency sine wave sine wave Square wave sine wave Low / High speed rotation Possible / Driver Inverter needed Possible / Encoder Possible / Encoder Life long long commonly long repair otiosity otiosity otiosity otiosity High speed be easy be easy be easy be easy rotational speed possible possible difficult possible Slow fire be easy be easy be easy be easy Electromagnet utilization Individual iron core wound type Iron core slot insertion type Iron core slot section winding type Iron core slot section winding type Slot utilization Individual iron core type Cylindrical iron core type Circular iron core slot Circular iron core slot Rotational variation be few commonly There are many be few Instant Talk good night good night difficult good night Torque fluctuation be few commonly There are many be few Output efficiency It is very good commonly commonly good night Clean Do good night commonly commonly good night Vibration noise be small be small be small be small fever commonly be small big commonly price Mid-range price range Cheap commonly It is very expensive volume Small / Medium / Large Small / Medium / Large Small / Medium / Large Small / Medium / Large

[0163] (Table 2. Performance Comparison Table of Conventional Motor and External-Rot Motor Systems Using Iron Cores)

[0164] An external-rotor motor system (100) using an iron core can supply rotational force to a rotor (20) within the magnetic field range of an individual electromagnet (131) through two-phase voltage, current, and sine wave, and the rotor (20) can be affected by a magnetic field within a 180-degree cycle range leading the back EMF angle in the two-phase phase of the external-rotor motor system (100).

[0165] Not limited thereto, according to an embodiment of the present invention, an external type motor system (100) using an iron core (131-1) can supply rotational torque to a rotor (20) through a continuous rotational cycle in an individual electromagnet magnetic field range through not only two phases but also two, four, or six phases.

[0166] Here, 2-phase can have a single pole, 4-phase can have two poles, and 6-phase can have three poles.

[0167] Specifically, in the 2-phase, it has a duration cycle of 1 / 3, in the 4-phase, it has a duration cycle of 1 / 2, and in the 6-phase, it can have the same duration cycle as the 3-phase.

[0168] The external type motor system (100) using an iron core in a two-phase phase can have a two-phase two-circuit single pole, which can represent a single-phase type having two signal implementation waves as N pole and S pole.

[0169] In addition, the external type motor system (100) using an iron core in a four-phase phase can have two poles in two circuits of four phases, and this can represent a two-phase type having four signal implementation waves as N pole and S pole.

[0170] In addition, the external type motor system (100) using an iron core in a 6-phase phase can have 6 phases, 2 circuits, and 3 poles, which can represent a 3-phase type having 6 signal implementation waves in the N pole and S pole.

[0171] According to an embodiment of the present invention, the motor driver (180) of an external type motor system (100) using an iron core can control the RPM of a DC motor by converting from DC to AC and controlling the RPM of the DC motor with a sinusoidal frequency from AC, and can control the motor with DC voltage, current, and sinusoidal wave by converting AC back to DC.

[0172] The motor driver (180) detects the position of the permanent magnet (150) through at least one NPN sensor and a PNP sensor, and based on this, the motor driver (180) can apply power to a coil wound in a series winding method or a parallel winding method.

[0173] By applying power, the external type motor system (100) using an iron core can generate continuous short waves and changing voltage, current, and sine waves at phase angles of 180 degrees and 360 degrees, and the motor driver (180) can determine the speed of the motor according to the amplitude of the sine wave.

[0174] As can be seen in FIGS. 34 to 39, the operation of the motor driver (180) of the external type motor system (100) using an iron core is as follows based on 2 poles and 4 signals.

[0175] First, the motor driver (180) applies a positive (+) current to the 1A active element and a negative (-) current to the 1D active element using the position information of the N pole or S pole of the permanent magnet (150) detected by the position detection unit (160).

[0176] Next, the motor driver (180) applies a positive (+) current to the 1C active element and a negative (-) current to the 1B active element.

[0177] Next, the motor driver (180) applies a positive (+) current to the 1A active element and a negative (-) current to the 1D active element.

[0178] Next, the motor driver (180) applies a positive (+) current to the 1C active element and a negative (-) current to the 1B active element.

[0179] According to an embodiment of the present invention, through the operation of the motor driver (180) of the external type motor system (100) using an iron core, the N pole of the permanent magnet (150) rotates with an attractive force with the S pole of the individual electromagnet (131) and a repulsive force with the N pole, and the S pole of the permanent magnet (150) can rotate with a repulsive force with the S pole of the individual electromagnet (131) and an attractive force with the N pole.

[0180] As can be seen in Table 3 below, the external type motor system (100) using an iron core can be seen to have an efficiency of about 30% improved compared to the output torque of a conventional comparison product BLDC.

[0181] According to an embodiment of the present invention, the efficiency of the external type motor system (100) can be further increased by adjusting the RPM output.

[0183] division voltage phase waveform Extreme number RPM Rated current Rated torque Existing BLDC 48V Phase 3 Stairway wave 8 poles 4000RPM 20.8A 4.75Nm External rotor motor system 48V Reflections sine wave 22 poles 12,000 RPM 11.2A 6.78Nm 48V Phase 4 10.4A 48V Phase 6 9.6A

[0184] (Table 3. Comparison of efficiency between conventional BLDC and external rotor motor systems using an iron core)

[0185] As can be seen in FIGS. 34 and 39 according to an embodiment of the present invention, the external rotor motor system (100) using an iron core has been described based on a 2-pole 4-signal 2-circuit configuration, but as can be seen in FIGS. 40 and 46, the external rotor motor system (100) using an iron core can be configured as a 1-pole 1-signal 1-circuit, a 1-pole 2-signal 1-circuit, a 1-pole 2-signal 2-circuit, or a 2-pole 2-signal 2-circuit configuration depending on the number of active elements (170) and position detection units (160).

[0186] The 2-pole 2-signal 2-circuit operation of the external type motor system (100) using an iron core according to one embodiment of the present invention is as follows.

[0187] First, the motor driver (180) applies a positive (+) current to the 1C active element and a negative (-) current to the 1B active element using the position information of the N pole or S pole of the permanent magnet (150) detected by the position detection unit (160).

[0188] Next, the motor driver (180) applies a positive (+) current to the 1A active element and a negative (-) current to the 1D active element.

[0189] In addition, the single-pole two-signal two-circuit operation of the external type motor system (100) using an iron core is as follows.

[0190] First, the motor driver (180) applies a positive (+) current to the 1C active element and a negative (-) current to the 1B active element using the position information of the N pole or S pole of the permanent magnet (150) detected by the position detection unit (160).

[0191] Next, the motor driver (180) applies a positive (+) current to the 1A active element and a negative (-) current to the 1D active element.

[0192] Next, the motor driver (180) applies a positive (+) current to the 1C active element and a negative (-) current to the 1B active element.

[0193] FIG. 47 illustrates the first operation of a three-phase three-sensor system of an external-rotor motor system using an iron core, FIG. 48 illustrates the second operation of a three-phase three-sensor system of an external-rotor motor system using an iron core, FIG. 49 illustrates the first operation of a four-phase four-sensor system of an external-rotor motor system using an iron core, and FIG. 50 illustrates the second operation of a four-phase four-sensor system of an external-rotor motor system using an iron core.

[0194] Referring to FIGS. 47 to 50, an external type motor system (100) using an iron core can generate rotational force by applying current to an active element (170) using position information of the N pole or S pole of a permanent magnet (150) of a motor driver (180).

[0195] As can be seen in FIGS. 47 and 48, the method of generating rotational force based on a three-phase three-sensor for an external-rotor motor system (100) using an iron core is as follows.

[0196] The motor driver (180) detects the position of the permanent magnet (150) using three position detection sensors of the position detection unit (160), and applies current to the active element (170) based on the position of the permanent magnet (150), so that as shown in FIG. 47, the individual electromagnet (131) at point 1 can have a positive (+), the electromagnet at point 2 can have a negative (-), and the individual electromagnet (131) at point 3 can have a positive (+).

[0197] Next, as shown in FIG. 48, the individual electromagnet (131) at point 1 has a positive (-), the individual electromagnet (131) at point 2 has a negative (+), and the individual electromagnet (131) at point 3 has a positive (-), and the permanent magnet (150) can move in the order of 1-2-3 by the repulsive and attractive forces of the permanent magnet (150) to generate rotational force.

[0198] As can be seen in FIGS. 49 and 50, the method of generating rotational force based on a 4-phase 4-sensor for an external-rotor motor system (100) using an iron core is as follows.

[0199] The motor driver (180) detects the position of the permanent magnet (150) using four position detection sensors of the position detection unit (160), and applies current to the active element (170) based on the position of the permanent magnet (150), so that as shown in FIG. 49, the individual electromagnet (131) at point 1 can have a positive (+), the individual electromagnet (131) at point 2 can have a negative (-), the individual electromagnet (131) at point 3 can have a positive (+), and the individual electromagnet (131) at point 4 can have a negative (-).

[0200] Next, as shown in FIG. 50, the individual electromagnet (131) at point 1 has a positive (-), the individual electromagnet (131) at point 2 has a negative (+), the individual electromagnet (131) at point 3 has a positive (-), and the individual electromagnet (131) at point 4 has a negative (+), and the permanent magnet (150) can move in the order of 1-2-3-4 by the repulsive and attractive forces of the permanent magnet (150) to generate rotational force.

[0201] In the external-rotation type motor system (100) using an iron core according to an embodiment of the present invention, although the method of generating rotational force of the external-rotation type motor system (100) using an iron core is described through circuit diagrams of 3-phase 3-sensor and 4-phase 4-sensor in FIGS. 45 to 48, it is not limited thereto, and rotational force can be generated by the repulsion and attraction of the permanent magnet (150) in a plurality of circuit diagrams such as a single-pole 1-signal 1-circuit, a single-pole 2-signal 1-circuit, a single-pole 2-signal 2-circuit, a 2-pole 2-signal 2-circuit, and a 2-pole 4-signal 4-circuit, as the N-pole and S-pole of each individual electromagnet (131) are formed alternately.

[0202] The present invention has been described above with reference to the embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. For example, in the embodiments of the present invention, the embodiments of the present invention have been described by assuming an external-rotating motor (100) using an iron core, but the same can be applied to all cases of an external-rotating motor system (100) using an iron core without any modifications. Therefore, the true technical scope of protection of the present invention should be determined only by the appended claims. Explanation of the symbols

[0203] 10: Rotor 20: Stator 30 : Bearing 40 : Specified angle 50 : Air gap 110 : Shaft 120 : Housing 130 : Magnetizing part 140: Cooling module 150: Permanent magnet 160: Position detection unit 170: Active element 180 : Motor driver

Claims

Claim 1 An external-rotor motor system using an iron core, comprising: a shaft coupled inside the stator; a magnetizing unit in which at least one iron core having a predetermined shape is arranged at a predetermined angle at the end of the stator with respect to the transverse direction of the shaft, and an individual electromagnet is formed through a forward winding coil and a reverse winding coil wound on each of the iron cores; a permanent magnet arranged at the same angle as the magnetizing unit and arranged at the innermost side of the rotor; a position detection unit for detecting the positions of the N pole and S pole of the permanent magnet; an active element for applying power to the magnetizing unit; and a motor driver for alternately applying power to the forward winding coil or the reverse winding coil according to the detection signal of the position detection unit. Claim 2 In claim 1, the external rotor motor system using the iron core further comprises a housing coupled to both ends of the shaft. Claim 3 In claim 2, the housing is an external rotor system using an iron core, wherein the housing is provided with an air outlet and an intake port on one side of the housing to discharge heat from the magnetized part. Claim 4 In claim 3, the housing is an external rotor type motor system using an iron core having an insulating resin within the housing. Claim 5 In claim 1, the external rotor motor system using the iron core further comprises a cooling module for cooling heat generated from the individual electromagnets. Claim 6 In claim 5, the cooling module comprises a cooling tank disposed inside the stator to cool the body of the stator, thereby forming an external rotor system using an iron core. Claim 7 In claim 6, the shaft further comprises a refrigerant intake port and a refrigerant discharge port for supplying and discharging refrigerant to the cooling tank, in an external rotor type motor system using an iron core. Claim 8 An external rotor motor system using an iron core according to claim 7, wherein the cooling module supplies refrigerant from the refrigerant intake port of the shaft to the cooling tank, cools the stator through the supplied refrigerant, and then discharges the refrigerant through the refrigerant outlet. Claim 9 An external rotor motor system using an iron core, characterized in that, in claim 1, the iron core is configured using one of a U-shape, a T-shape, and a circle. Claim 10 An external rotor type motor system using an iron core according to claim 9, wherein the iron core increases the effective contact area of ​​the flowing air of the individual electromagnet and increases the heat dissipation area of ​​the individual electromagnet. Claim 11 An external rotor motor system using an iron core according to claim 9, characterized in that the C-shaped iron core has one enamel coil wound on one side of the C-shaped iron core or two enamel coils wound on both ends of the C-shaped iron core, the T-shaped iron core has one enamel coil wound on a straight section of the T-shaped iron core, and the circular iron core has one enamel coil wound on one side of the circular iron core. Claim 12 In claim 1, the individual electromagnet is arranged at an angle ranging from 0 to 60 degrees with respect to the transverse direction of the shaft at the end of the stator, and at least one is arranged in the circumferential direction of the stator, forming an external rotor motor system using an iron core. Claim 13 In claim 12, the magnetizing part is characterized by individual electromagnets forming an N pole or a S pole on one of the iron cores, in an external rotor type motor system using an iron core. Claim 14 An external rotor type motor system using an iron core, characterized in that, in claim 13, the magnetization part forms an N-pole electromagnet through the forward winding coil and forms an S-pole electromagnet through the reverse winding coil. Claim 15 In claim 14, an external rotor type motor system using an iron core in which diodes are installed in the forward winding coil and the reverse winding coil to prevent the generation of back EMF. Claim 16 In claim 4, the position detection unit comprises at least one NPN sensor on one side of the housing to detect the N pole of the permanent magnet and at least one PNP sensor on one side of the housing to detect the S pole of the permanent magnet, thereby forming an external rotor type motor system using an iron core. Claim 17 In claim 16, the position detection unit detects the N and S poles of the permanent magnet when the position detection unit reaches a position at 2 / 3 or 1 / 2 of the forward coil and reverse coil wound on the iron core when the permanent magnet rotates in the rotational direction of the rotor. This is an external rotor type motor system using an iron core. Claim 18 An external rotor type motor system using an iron core, characterized in that, in claim 1, at least one active element is installed to apply power to the magnetization part. Claim 19 In claim 1, the above active element is an external rotor type motor system using an iron core composed of a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor). Claim 20 An external-rotor motor system using an iron core, characterized in that, in any one of claims 17 to 19, the motor driver controls the operation of at least one active element based on the position of a permanent magnet detected by at least one NPN sensor and a PNP sensor. Claim 21 In claim 20, the motor driver is an external-rotor type motor system using an iron core, wherein when the NPN sensor detects the N pole of the permanent magnet, power is applied to the forward winding coil through the active element according to the detection signal, or when the PNP sensor detects the S pole of the permanent magnet, power is applied to the reverse winding coil through the active element according to the detection signal. Claim 22 An external rotor type motor system using an iron core according to claim 21, wherein the motor driver supplies rotational force to the rotor by alternately applying power to the forward winding coil or the reverse winding coil through the active element based on the position of the N pole or S pole of the permanent magnet detected by the position detection unit.

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