KR101501060B1 - Stator Having 3-Core Connection Structure, BLDC Motor of Single Rotor Type Using the Same and Method for Driving the Same - Google Patents

Abstract

According to the present invention, as the coil winding is performed by the three-wire method, the ratio of the slots and the poles can be minimized to reduce the cogging noise and the effective area between the magnet and the teeth A single rotor type BLDC motor using the stator, and a driving method thereof. 2. Description of the Related Art [0002] A stator having a three-wire structure is disclosed.
A single rotor type BLDC motor of the present invention includes: a rotor in which a plurality of N-pole and S-pole magnets are alternately arranged; And a stator disposed spaced apart from the rotor, wherein the three-phase coil is wound around a tooth of the core, wherein the coil is connected in a three-phase driving manner, and each coil of each phase is connected to three consecutive teeth in forward and reverse directions And the adjacent teeth that are consecutively wound in the order of the forward direction are generated in opposite directions to each other.

Description

[0001] The present invention relates to a stator having a three-wire structure, a single-rotor type BLDC motor using the same, and a driving method thereof. [0002]

The present invention relates to a stator having a three-wire structure, a single-rotor type BLDC motor using the stator, and a driving method thereof, and more particularly, cogging), a three-wire stator that can increase the efficiency by reducing the leakage magnetic flux by increasing the effective area between the core and the core by setting a small gap between the core and the core, and a single rotor Type BLDC motor and a driving method thereof.

In a typical BLDC motor, the stator structure in which the winding order of the stator coils is alternately arranged for each phase of U, V, and W is used for the integral core, and the switching transistors of the inverter circuit are sequentially switched, The current flowing through the stator coil is switched to generate a rotating magnetic field to rotate the rotor.

For example, Japanese Patent Application Laid-Open Nos. 10-2005-245 and 10-2010-73449 disclose a stator having a plurality of divided cores wound with coils arranged alternately for each of U, V and W phases A double rotor / single stator type motor is proposed.

Hereinafter, a method of designing a motor (hereinafter referred to as " one wiring structure motor ") in which one divided core in which coils are wound by each phase is alternately arranged for each phase in a BLDC motor provided with a split core stator will be described.

First, when designing a single wiring structure motor, the setting between the slot of the stator and the magnet (magnetic pole) of the rotor is set as shown in Equation (1).

[Equation 1]

Number of magnetic poles = (number of slots / 3) × multiple of 2

However, when the number of slots is as large as 27, for example, when designing the motor, the number of magnetic poles is set to be larger than the number of slots. As a result, according to Equation (1), the number of slots and poles of the motor is set to a ratio, for example, 18 slots 12 poles, 27 slots 36 poles, 36 slots 48 poles.

The operation of the BLDC motor of the larger rotor structure designed according to the above-described 1-connection method will be described with reference to Table 1 below.

Electrical angle 0 ° 60 ° 120 ° 180 ° 240 ° 300 ° 360 °,
0 ° Machine angle 0 ° 10 ° 20 ° 30 ° 40 ° 50 ° 60 °,
0 ° H1 N N S S S N N H2 S N N N S S S H3 S S S N N N S input U V V W W U U Print W W U U V V W The upper FET FET1 FET3 FET3 FET5 FET5 FET1 FET1 The lower FET FET2 FET2 FET4 FET4 FET6 FET6 FET2

As shown in Table 1, conventionally, three Hall elements H1 to H3 are sequentially arranged between slots and slots, and are installed at angles determined by (360 / slot number), that is, at intervals of 20 degrees, (N pole or S pole) of the rotor is detected and transmitted to the motor drive circuit.

The motor shows a state at 0 °. By switching and applying the direction of the current flowing through the stator coil at every 10 ° in the 6-step method, the divided core forms an electromagnet to generate a magnetic field.

The motor driving circuit includes a control unit and an inverter circuit. The inverter circuit includes three pairs of switching transistors (FETs) connected to totem poles. The upper FETs FET1, FET3, and FET5 and the lower FETs FET4, FET6, (U, V, W) of each phase are generated from the connection point between the stator coil and the stator coil of the motor.

When the rotor position signal of the rotor is detected by the Hall elements H1 to H3 at the respective angles, the inverter circuit according to Table 1 turns on the pair of switching transistors (FET) Setting.

For example, when the Hall elements H1 to H3 detect the polarities of the outer rotor as "N, S, S ", the control unit determines that the rotor rotational position is 0 DEG, and the upper FET1 and the lower FET2 When the driving signal is applied to turn on the FET, the current flows to the ground via the FET1-U phase coil and the W-phase coil-FET2.

As a result, the U-phase split core generates an inward magnetic flux, the W phase split core generates a magnetic flux directed to the outward direction, and a magnetic circuit is set, and the inner rotor and the outer rotor are magnetized with N poles and S pole magnets The more the blotter set to rotate is rotated clockwise.

In the BLDC motor, for example, the U-phase split core for generating the magnetic flux in the inward direction preferably has only the N pole magnet of the outer rotor facing the outside of the core, but the S pole magnet It is preferable that the inside of the core is opposed to only the S pole magnet of the inner rotor but a part of the U phase split core also faces the adjacent N pole magnet and the efficiency is lowered.

In this case, the divided cores of the stator in the BLDC motor are activated by applying driving signals to the coils while skipping the divided cores corresponding to one of the phases U, V, and W for each step.

For example, when the rotation position of the rotor is 0 °, the U phase and the W phase split core of the stator extract the V phase split core and the drive signal is applied to the coils wound on two consecutive divided cores of the U and W phases, As a result, two consecutive divided cores in which activation is performed generate magnetic fluxes in opposite directions to each other.

At this time, as described above, the BLDC motor also has the U-phase split core facing the outer side of the U-phase split core in addition to the N-pole magnet and the adjacent S-pole magnet, and the inner side of the U- And a U-phase split core in an inactive state is disposed between the opposing S-pole magnet and the N-pole magnet, so that a magnetic circuit configuration effective for rotating the rotor in one direction is not achieved.

In addition, as the number of slots of the rotor in the motor is smaller, noise is generated because the adjacent S pole magnets and the N pole magnets overlap each other at the overlapped portions.

Further, the BLDC motor designed in accordance with the conventional 1-wire method is configured such that the slots and the poles of the motor are set as 18 slots 12 poles, 27 slots 36 poles, 36 slots 48 poles, and the ratio of the number of slots to the number of poles is 30 to 40% Therefore, when the rotor rotates, an effective area difference of the magnetic force (magnetic flux) between the magnet and the core occurs depending on the rotation angle. As a result, cogging occurs severely and magnetic flux leakage occurs.

Accordingly, in the conventional 1-wire BLDC motor, the opening width between the slot and the slot is widened and the outer circumferential surface is rounded (R) in order to minimize the noise caused by cogging, It is required to perform edge processing for round (R) processing, which leads to an increase in production cost and a decrease in efficiency.

As a result, the conventional 1-wire BLDC motor requires a wide opening width between a slot and a slot to be efficient, reduce noise, and have an opening width of a certain level or more.

In addition, the conventional 1-wire BLDC motor has a disadvantage in that a number of wiring portions is large because coils wound on each of the divided cores must be connected to each other.

Furthermore, as described above, the conventional one-wire BLDC motor has an angle that is determined according to (360 degrees / number of slots) or {(360 degrees / number of poles) x 2 poles / 3} There is a problem that the Hall element printed circuit board (PCB) on which three Hall elements are mounted must be sized to cover an angle in the range of 40 degrees.

On the other hand, in Japanese Patent No. 10-663641, coils are continuously wound in forward directions on nine divided cores allocated to each phase of U, V, and W, and these coils are classified into three core groups, and three wires 3 And the core groups are arranged alternately in the order of the phases.

In this case, each of the three core-wired core groups is formed for the purpose of eliminating the PCB for assembly and solving the wiring problem between the divided cores, and the three divided core segments are all wound in the forward direction.

As a result, since the three-wire structure motor of the 27-slot and 24-pole structure has the coils wound on the three consecutive divided cores in the forward direction, the divided cores located in the middle of the three The magnetic fluxes of the other divided cores disposed in the rotor core are canceled rather than effectively contributing to the rotation of the rotor and the efficiency is not improved.

On the other hand, a motor using a stator in which coils of two-winding type in which the winding order of the coils is wound in the forward and reverse directions on the teeth of the integral stator core are sequentially arranged for each phase has been proposed.

The cogging noise of the above 2-wire type motor is smaller than that of the 1-wire type motor, but the problem of the wiring area increase compared to the 3-wire type motor and the arrangement position of the hall elements must be located every 2 slots (30 °) And the integral type stator core requires the nozzle of the winding machine to be inserted between the slot and the slot so that the opening width between the cores must be maintained over a certain range to enable the winding. Therefore, the 2-wire type motor was applied for the purpose of reducing cogging rather than efficiency.

Patent Document 1: Korean Patent Laid-Open No. 10-2005-245 Patent Document 2: Korean Patent Laid-Open No. 10-2010-73449 Patent Document 3: Korean Patent No. 10-663641

As described above, the conventional 1-wire or 2-wire type motor commonly has a high cogging noise, low efficiency, a large number of wiring sites, and a large PCB size for Hall element assembly.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems of the prior art described above, and its object is to minimize the ratio of the slots and the poles as the coil winding is performed by the three wire method, thereby greatly reducing the cogging noise, A stator of a three-wire structure capable of increasing the efficiency as the leakage magnetic flux is reduced by increasing the effective area between the magnet and the core (or the teeth) by setting the interval between the core (tooth) and the core And a method of driving the BLDC motor.

It is a further object of the present invention to provide a magnetic circuit in which all three cores (teeth), when the same phase motor drive signal is applied to three consecutive coils, And a reverse coil winding is provided on a core (tooth) positioned in the middle of the three cores (teeth).

It is a further object of the present invention to provide a method of winding a coil between a pair of adjacent S poles and N pole magnets in a single rotor opposed to a tip of a core (tooth) The present invention provides a BLDC motor using a stator having a three-wire structure in which an effective magnetic flux path is established even when an overlapping portion exists, thereby increasing the effective area of the magnet and increasing the efficiency.

It is another object of the present invention to provide a stator of a three-wire structure capable of miniaturizing a Hall element assembly by minimizing an arrangement interval of hall elements for detecting a rotor position signal.

It is still another object of the present invention to provide a stator having a three-wire structure in which a winding method and a wire connection method are simple in accordance with a continuous winding case by using a three-wire method in a divided core for a single rotor.

Another object of the present invention is to provide a stator core (teeth) having a small opening width of the core (teeth), which increases the effective area facing the magnet and increases the efficiency. As a result, it is necessary to round the corners of the stator core And to provide a BLDC motor using a stator having a three-wire structure.

It is still another object of the present invention to provide a rotor in which the adjacent divided cores (Tees) are rotated in the same direction with the rotor set to the opposite polarity as the winding direction and the drive signal switching of the three- The present invention is to provide a new motor driving method of a three-wire structure in which a suction force and a repulsive force are generated at the same time so that rotational driving of the single rotor can be effected effectively.

It is another object of the present invention to provide a new motor drive method of a three-wire structure that minimizes the ratio between the slot of the stator and the pole of the rotor, thereby achieving low cogging noise and increased efficiency.

In order to achieve the above object, the present invention provides a rotor comprising: a rotor having a plurality of N-pole and S-pole magnets arranged alternately; And a stator disposed spaced apart from the rotor, wherein the three-phase coil is wound around a tooth of the core, wherein the coil is connected in a three-phase driving manner, and each coil of each phase is connected to three consecutive teeth in forward and reverse directions And a magnetic flux is generated in a direction opposite to that of the adjacent teeth that are consecutively wound in the order of the forward direction.

The number of the magnets of the rotor is determined by (number of slots / 9) x 8, and the number of slots is preferably set to a multiple of nine.

Further, the three-phase coil is wound in three consecutive teeth in each of U, V, and W phases in forward, reverse, and forward directions to generate magnetic fluxes in opposite directions between adjacent teeth, and U, V And W phases, and when a driving signal is applied to adjacent two core groups, six teeth included in two adjacent core groups are activated in opposite directions to each other do.

In this case, the six consecutive teeth included in the adjacent two core groups are all set to the same polarity or opposite polarity as the magnetic poles of the opposed rotor magnets, thereby rotating the rotor in the same direction.

Further, the three teeth of which the coils of each phase are continuously wound form one core group, and the coils of each phase include a plurality of core groups alternately arranged for each phase of U, V, W, The six consecutive teeth included in the two core groups are set to the same polarity or opposite polarity as the magnetic poles of the opposed rotor magnets when the drive signal is applied to rotate the rotor in the same direction.

According to the present invention, the BLDC motor further includes three hall elements for detecting a position signal of the rotor, and the angle between the Hall elements may be set to (360 ° / number of slots) 3 or (360 ° / ) X 2/3, and a drive signal for the coil is preferably applied based on a combination of position signals of the rotor detected by the three Hall elements.

According to the present invention, the BLDC motor further comprises two hall elements for detecting a position signal of the rotor, wherein an angle between the hall elements is set to (360 ° / number of poles) / 2, And the drive signal is preferably applied using the position signal of the rotor detected by the two Hall elements.

The stator has a plurality of coils wound around a plurality of teeth determined by the phases of U, V and W (multiples of 9/3), and one side of each phase coil is connected to a U- , V, and W outputs, and the other sides of the phase coils are mutually connected to form a neutral point (NP).

Also, the BLDC motor is preferably driven in a six step manner, and the three-phase coil preferably forms a neutral point by a star wiring method.

Furthermore, it is preferable that the number of slots and poles of the motor is set to one of 18 slots 16 poles, 27 slots 24 poles, 36 slots 32 poles, and 45 slots 40 poles.

The core of the stator may be composed of a plurality of segmented cores including a T-shaped tooth to which the coil is wound and a body extending from the teeth and mutually coupled to form an annular back yoke.

In this case, the divided cores may be annularly assembled by coupling protrusions and coupling grooves formed in the body, respectively.

In addition, the plurality of teeth may further include an insulating bobbin for insulating a coil wound around the outer periphery, and the plurality of teeth may be assembled in an annular shape using a coupling structure formed on the bobbin.

The BLDC motor is driven in a six-step manner, and when a drive signal is applied, six consecutive six teeth are set to an active state, and one consecutive And the three teeth are set to the inactive state.

According to the present invention, the six consecutive teeth are all set to the same polarity or opposite polarity as the magnetic pole of the magnet of the opposite rotor, or a part of the tooth is set to the opposite polarity to the magnetic pole of the rotor magnet, Is set to the same polarity as that of the magnetic pole of the opposed rotor magnet, and it is preferable to rotate the rotor in the same direction.

According to another aspect of the present invention, there is provided a rotor comprising: a rotor in which a plurality of N poles and S pole magnets are alternately arranged; And a stator disposed spaced apart from the rotor, wherein the three-phase coil is wound around a tooth of the core, wherein the coil is connected in a three-phase driving manner, and each coil of each phase is connected to three consecutive teeth in forward and reverse directions And when the drive signal is applied to the coil, six consecutive teeth of two phases out of three phases are set to an active state, and one phase consecutively arranged between the consecutive six teeth The three teeth being set to the inactive state, and the six consecutive teeth being driven, magnetic fluxes are generated in opposite directions to each other.

In this case, the six divided cores included in the two core groups generate magnetic fluxes in opposite directions, and the six consecutive divided cores have the same polarity or opposite polarity as the magnetic poles of the opposing inner rotor and outer rotor magnets Polarity, and the rotor can be rotated in the same direction.

According to another aspect of the present invention, there is provided a rotor comprising: a rotor in which a plurality of N poles and S pole magnets are alternately arranged; And a stator disposed spaced apart from the rotor and having a three-phase coil wound around a tooth of the core, wherein the number of magnets of the rotor is determined as (number of slots / 9) x 8, and the number of slots is a multiple of nine And the stator is wound on a plurality of teeth determined by each phase of U, V and W (multiples of 9/3).

According to another aspect of the present invention, there is provided a motor drive method for a three-phase drive type BLDC motor, comprising the steps of: generating three-phase coils in forward, reverse, A three-phase driving type BLDC motor having a plurality of N-pole and S-pole magnets alternately arranged at intervals in a stator arranged alternately for each of U, V, and W phases ; Determining a position of the rotor based on the rotor position signal detected by the rotor position detection element; And applying drive signals to two coils of the three-phase coil based on the rotor position, wherein when a drive signal is applied to the coils of the adjacent two core groups, six And the teeth generate magnetic flux in opposite directions to each other.

In this case, six consecutive teeth included in the adjacent two core groups are activated, and the remaining three teeth in the inactivated state are preferably disposed between the six teeth.

In addition, in the present invention, when a neutral point is formed by a three-phase coil star connection method, a drive signal is applied to one of two adjacent core groups in which activation is performed from the start terminal of the coil, And is applied from the end terminal of the coil.

Further, the six consecutive teeth are all set to the same polarity or opposite polarity as the magnetic pole of the opposite rotor magnet, or a part of the tooth is set to the opposite polarity to the magnetic pole of the opposite rotor magnet, Is set to the same polarity as that of the magnetic pole of one rotor, so that the rotor can be rotated in the same direction.

According to still another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: a core having a plurality of teeth radially extended from an annular back yoke; And a three-phase coil wound on each of the plurality of teeth, wherein the three-phase coil has three divided cores, each of which is consecutive for each phase so as to generate a magnetic flux in mutually opposite directions between adjacent teeth, in forward, The stator of the three-wire structure is characterized in that it is wound in the following order:

As described above, according to the present invention, as the coil winding is performed by the three-wire method, the ratio of the slots and the poles can be minimized, so that the cogging noise is greatly reduced and the gap between the core (tooth) It is possible to increase the effective area between the magnet and the core (teeth) to reduce the leakage magnetic flux, thereby increasing the efficiency.

Further, in the present invention, when reverse coil windings are formed on the core (teeth) positioned in the middle of three consecutive cores (teeth), when the same phase motor drive signal is applied to three consecutive coils, All of the cores (teeth) generate a magnetic flux which rotates the magnet of the opposed rotor in the same direction, so that effective force transmission to the rotor is achieved.

Further, in the present invention, since the coil winding is performed by the three-wire method and the three cores (teeth) operate as one set, a single rotor opposed to the tip of the core (tooth) overlaps between the adjacent S pole and N pole magnets An effective magnetic flux path is set even if a portion exists, so that the effective area of the magnet is increased and the efficiency can be increased.

The present invention minimizes the arrangement interval of the hall elements for detecting the rotor position signal, thereby miniaturizing the Hall element assembly.

According to the present invention, the winding method and the wiring method are simple in accordance with the continuous winding method using the three-wire method in the divided core.

In the present invention, as the opening width of the core becomes narrower, the effective area facing the magnet becomes larger and the efficiency increases. As a result, it is not necessary to round the corners of the stator core (teeth) and the magnet.

As the drive signal is switched between the winding direction and the three-phase drive circuit so that a magnetic flux is generated in a direction opposite to the direction in which the adjacent divided cores (teeth) are mutually driven, a suction force and a repulsive force So that the rotational drive of the single rotor can be effected effectively.

FIG. 1A is a cross-sectional view in a radial direction of a single rotor type BLDC motor using a three-wire structure stator in which coils are wound around an integrated core by a three-wire method according to an embodiment of the present invention.
FIG. 1B is a cross-sectional view in a radial direction of a single rotor type BLDC motor using a three-wire structure stator in which coils are wound around an integrated core by a three-wire method according to an embodiment of the present invention.
Fig. 2 is an explanatory view showing the arrangement order and mutual connection relation at the time of assembling the divided cores in the motor shown in Fig. 1B,
FIG. 3 is a cross-sectional view in a radial direction of a single rotor type BLDC motor designed with an 18-slot 16-pole system according to an embodiment of the present invention when the rotor is at "0"
Fig. 4 is a circuit diagram showing a coil wiring diagram of the three-phase (U, V, W) drive coil shown in Fig. 3 and a motor drive circuit together;
5 is a flowchart illustrating a method of driving a single rotor type BLDC motor according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Hereinafter, the same reference numerals will be used for the same constituent elements in the drawings, and redundant explanations for the same constituent elements will be omitted.

Hereinafter, the rotor used in the embodiment of the present invention means a rotor, the single rotor means a single rotor, and the stator means a stator.

1B is a cross-sectional view in a radial direction of a single-rotor type BLDC motor using a three-wire-structured stator in which coils are wound by a three-wire method according to an embodiment of the present invention. FIG. 3 is a single-rotor type BLDC motor designed in an 18-slot 16-pole manner according to a three-wire method according to an embodiment of the present invention. FIG. 3 is a cross- Fig. 4 is a circuit diagram showing the coil wiring diagram of the three-phase (U, V, W) drive coil shown in Fig. 3 and the motor drive circuit together.

1A and 1B, a single rotor type BLDC motor according to the present invention is, for example, an 18-slot 16-pole type motor. The rotor includes a stator 120 and a stator 120, (110). In the description of the embodiment shown in Figs. 1A and 1B, an outer rotor motor in which a rotor is disposed outside the stator is described as an example, but the present invention can also be applied to an inner rotor motor in which a rotor is disposed inside a stator .

The rotor 110 includes a plurality (16) of magnets (i.e., poles) 345-390 having different polarities (N poles and S poles) sequentially annularly attached to a back yoke .

As shown in Fig. 1A, the stator 120 may be embodied as an integral core in which a plurality of (eighteen) teeth u11 to w16 each having a T-shaped tip end are radially extended from an annular back yoke, (18) divided cores (u11 to w16) having a tip end in a T shape and the rear ends interconnected to form an annular back yoke, as shown in Figs.

In the present invention, the core in which the coil is wound in the stator 120 and forms the magnetic circuit path can use an integral core or a divided core as described above.

Therefore, for convenience of explanation, the slots formed between the teeth, the divided cores, or the teeth and the teeth use the same meaning except for special cases, and give the same member numbers (u11 to w16).

The stator realized by assembling a plurality of (eighteen) divided cores u11 to w16 can reduce the material cost of the core, and according to the present invention, the three wire coils for three or six cores (teeth) The winding can be performed by the continuous winding method using a general-purpose winding machine in place of the dedicated winding machine at the time of winding, so that the manufacturing cost can be reduced. However, in the case of the divided core structure, it is necessary to pass the step of assembling the divided cores after winding the coils to the divided cores.

The number of the magnets (poles) and the number of teeth (slots) that implement the rotor 110 included in the single rotor type BLDC motor may have various combinations. The combination of the number of slots / poles implementing such a single rotor type BLDC motor is determined according to the following equation (2).

Hereinafter, in an embodiment of the present invention, a BLDC motor implemented in an 18 slot 16 poles will be described as an example for convenience of explanation.

The single rotor type BLDC motor according to the present invention has eighteen divided cores (u11-u16, v11-v16, v11-v16 and v11-v16) wound with coils (u1-u6, v1- w11-w16 are arranged in an annular shape, and a rotor 110 formed in an annular shape in which N-pole and S-pole magnets are alternately disposed on the outer side of the stator 120, respectively.

In the BLDC motor 100a having the divided core stator 120 according to the present invention, as shown in FIG. 1B, three divided cores, each of which is wound with a coil for each phase, Wiring structure motor ") will be described.

First, when designing a three-wire structure motor according to the present invention, a setting between a slot of a stator and a magnet (magnetic pole) of the rotor is set as shown in the following Equation 2:

&Quot; (2) "

Number of magnet poles = (number of slots / 9) x (9-1)

In Equation (2), the number of slots is determined to be a multiple of 9. According to Equation (2), the number of slots and poles of the motor is, for example, 18 slots 16 poles, 27 slots 24 poles, 36 slots 32 poles, The same ratio is set. Therefore, in the present invention, the ratio of the number of slots and the number of poles is about 12%. Thus, the cogging generated when the rotor rotates is reduced to about 1/10 as compared with the 1-wire method, The gap between the core (that is, the slot and the slot) is set to be narrow, and as a result, the opposing effective area between the magnet and the core increases, and the efficiency can be increased.

Further, when designing the three-wire structure motor according to the present invention, the rotor position detecting element for detecting the position signal of the rotor may use, for example, two or three Hall elements in a three-phase driving system .

In the case of using three Hall elements, the angle between the Hall elements H1 to H3 is set as shown in Equation 3 or Equation 4 below.

&Quot; (3) "

Angle between Hall elements = (360 占 / number of poles) 占 2/3

&Quot; (4) "

Angle between Hall elements = (360 占 / number of slots) 占 3

When two hall elements are used, the angle between the hall elements H1 and H2 is set as shown in the following equation (5).

&Quot; (5) "

Angle between Hall elements = (360 占 / number of poles) 占 2

In this case, rotor position detection for the remaining one Hall element H3 is calculated and applied in software.

In the present invention, it is possible to arrange that the hall element is arranged for each of three consecutive three teeth (or divided cores) connected in accordance with Equation (4), or that three holes are arranged in two poles (poles) according to Equation (3). According to Equation (3), a small Hall element assembly PCB can be used when three holes are arranged.

Referring to FIGS. 1A and 1B, the rotor 110 is coupled to a rotary shaft (not shown) at a central portion by a rotor support (not shown), and a load is connected to one end of the rotary shaft.

The rotor 110 is provided with annular back yokes (arrows) on its outer circumference so as to form N magnetic poles 350, 360, 370, 380 and 390 and S pole magnets 345, 355, 365, 375 and 385 alternately, For the sake of explanation.

The stator 120 is connected to six coils u1-u6, v1-v6 and w1-w6 for each U, V and W phases, and one side (start terminal) V and W outputs of the inverter circuit 50 constituting the inverter circuit, and the other ends (end terminals) of each phase are mutually connected to form a neutral point NP.

The stator coils u1-u6, v1-v6 and w1-w6 all form one core group G1-G6 by three divided cores u11-u16, v11-v16 and w11-w16 , The core groups G1 to G6 are alternately arranged and assembled for each of the U, V and W phases as shown in FIG. That is, the eighteen divided cores u11-u16, v11-v16 and w11-w16 are G1 (u11, u12, u13), G3 (v11, v12, v13), G5 , u15), G4 (v14, v15, v16), and G6 (w14, w15, w16) are assembled in this order so that the inner circumferential portions can be combined with each other to form an annular shape as shown in FIG.

As shown in FIG. 1B, the divided cores u11-u16, v11-v16 and w11-w16 are each formed in a T-shape so that the tip portion forms a winding region where the coil is wound, and the rear end body 127 (18) divided cores which form an annular back yoke 123 interconnected with each other. The body 127 of the split core is formed by various mutual coupling structures formed at both ends of the body when the annular back yoke 123 is formed, for example, by the coupling projections 127a and the coupling grooves 127b. Can be assembled.

When the stator coils u1-u6, v1-v6 and w1-w6 are wound, the divided cores u11-u16, v11-v16 and w11- Can be integrally formed. Furthermore, the insulating bobbin 125 can be coupled to the split cores assembled annularly with upper and lower bobbins.

When the plurality of divided cores are assembled in an annular shape, instead of being assembled together by the engaging projections 127a and the engaging grooves 127b, the bodies 127 are interconnected to form an annular back yoke 123 It is of course possible to be assembled by the coupling protrusions added to the insulating bobbin 125 and the coupling groove.

In the present invention, the three divided cores included in one core group are wound in the forward direction (u11), the reverse direction (u12), and the forward direction (u13) in the case of, for example, U phase G1 The divided cores in each core group generate magnetic fluxes in mutually opposite directions.

In the stator 120 as a whole, eighteen divided cores (u11-u16, v11-v16, w11-w16) are arranged so that a selective drive signal is generated so that mutually opposite magnetic fluxes are generated between adjacent divided cores (Not shown) of the motor drive circuit and applied to the stator coils u1-u6, v1-v6, and w1-w6 through the inverter circuit 50. [

The method of winding the stator coils u1-u6, v1-v6 and w1-w6 on the divided cores u11-u16, v11-v16 and w11-w16 comprises winding the six cores by the continuous winding method, It is possible to perform mutual connection after continuous winding to the cores, and to wire each core after winding it.

A method of winding the coils by the continuous winding method on six cores will be described below.

After the six U phase split cores (u11-u16) are assembled in a line by using five jigs (not shown), the continuous winding can be simply performed using the universal winder. In this case, the divided cores u12 and u15 located at the second and fifth positions are arranged in opposite directions so that reverse winding is performed. Therefore, in the present invention, the winding method and the wire connection method are simplified according to the three-wire continuous winding method using the universal winder on each of the divided cores (u11-u16, v11-v16, w11-w16).

Each of the divided cores (u11-u16, v11-v16, w11-w16) of the present invention has an insulating bobbin integrally formed on the outer periphery thereof and has outer and inner flanges on both sides so as to set a coil winding region in each bobbin have.

3 and 4, the operation of the BLDC motor 100a of the single rotor structure designed according to the three-wire method of the present invention will be described with reference to Table 2 below. Table 2 below is a logical table applied when driving the switching elements (FET1 to FET6) of the inverter circuit 50. [

Electrical angle 0 ° 60 ° 120 ° 180 ° 240 ° 300 ° 360 °,
0 ° Machine angle 0 ° 7.5 ° 15 ° 22.5 DEG 30 ° 37.5 DEG 45 °,
0 ° H1 N S S S N N N H2 N N N S S S N H3 S S N N N S S input V V W W U U V Print W U U V V W W The upper FET FET3 FET3 FET5 FET5 FET1 FET1 FET3 The lower FET FET2 FET4 FET4 FET6 FET6 FET2 FET2

In the present invention, as shown in FIG. 3, three Hall elements H1 to H3 are arranged in every three slots, that is, every 60 degrees according to Equation (4) Can be arranged every 15 [deg.] Calculated according to Equation (3) above, and can be arranged over a range of 30 [deg.].

As described above, according to the present invention, it is possible to minimize the arrangement interval of the Hall elements H1-H3 for detecting the rotor position signal according to Equation (3) The hole element assembly) can be downsized.

That is, a printed circuit board (PCB) for a Hall element assembly in which three Hall elements are mounted in the case of a conventional 18-slot motor having a 1-wire structure is manufactured to have a size covering an angle of 40 °, The motor of the present invention can be manufactured in a size that covers an angle of 30 degrees in the case of a motor having an 18 slot structure and can be manufactured in a small size have.

The Hall elements H1 to H3 detect magnetic poles (N poles or S poles) of the rotor 110 for each step and transmit them to the motor driving circuit.

The motor shown in Fig. 3 shows the state at 0 °, and the direction of the current flowing in the stator coils (u1-u6, v1-v6, w1-w6) A rotating magnetic field is generated by activating the divided cores u11-u16, v11-v16, w11-w16.

The motor drive circuit includes a control unit (not shown) and an inverter circuit 50. The inverter circuit 50 includes three pairs of power switching elements FET1 to FET6 connected to each other by totem poles, U, V and W of each phase are generated from the connection point between the lower FETs (FET3 and FET5) and the lower FETs (FET4, FET6 and FET2) to generate the stator coils u1-u6, v1-v6 and w1-w6 .

When the motor 100a is a three-phase drive system, the stator 120 includes three coils u1-u6, v1-v6 and w1-w6. For example, Are connected to each other to form a neutral point (NP).

The BLDC motor 100a selectively drives the two switching elements among the three pairs of switching elements connected to the totem pole based on the position signal of the rotor 110 to generate U-phase, V-phase, W-phase coils u1-u6 and v1 -v6, and w1-w6), the two stator coils are sequentially energized to generate the rotor system, thereby rotating the rotor. That is, the drive signal is applied to the one-phase coil from the output of the inverter circuit 50, and the other one-phase coil is applied through the neutral point.

When a position signal of the rotor 110 is detected by the Hall elements H1 to H3 at each angle in a control section (not shown) of the motor drive circuit, the inverter circuit 50 according to Table 2 is switched Turn on the device (FET) to set the current flow path.

For example, when the Hall elements H1 to H3 detect the polarity of the rotor 110 as "N, N, S" as shown in Fig. 3, the controller determines that the rotational position of the rotor 110 is 0 Phase coil (v1-v3) -V phase coil (v4-v6) -W phase coil w6 (v6-v6), and when the drive signal is applied so as to turn on the upper FET 3 and the lower FET 2, -w4) -W phase coil (w3-w1) -FET2 to ground.

As a result, a magnetic flux in the inward direction is generated in the divided core v11, a magnetic flux in the outward direction is generated in the divided core v12, a magnetic flux in the inward direction is generated in the divided core v13, The magnetic circuit is set and the rotor 110 is rotated in the clockwise direction.

Namely, the divided cores v11-v13 connected by three in the BLDC motor 100a of Fig. 3 are arranged such that the right portion of the tooth is connected with the opposing magnets 365, 370, 375 of the rotor 110, A great repulsive force is generated between the divided cores (i.e., the teeth) v11-v13 and the rotor 110 as they are arranged opposite to each other with the same polarity.

The left side portion of the tooth is opposed to the opposing magnets 360, 365 and 370 of the rotor 110 in opposite polarities such as NS, SN and NS with an area relatively smaller than the right side portion of the teeth of the divided cores v11- A small attractive force is generated between the divided cores v11 to v13 and the rotor 110. [

Therefore, since a small attractive force and a large repulsive force are generated between the divided cores v11-v13 and the rotor 110, the action of rotating the rotor 110 in the clockwise direction occurs.

The three wired divided cores w11-w13 disposed at the rear end adjacent to the three wired divided cores v11-v13 are arranged such that the left portion of the tooth is connected to the corresponding one of the magnets 375, 380, 385 of the rotor 110, NS and SN and the right portion of the tooth is disposed opposite to the magnets 380, 385 and 390 of the rotor 110 with the same polarity as NN, SS and NN, a suction force and a repulsive force are generated between the rotor 110 and the rotor 110 to rotate the rotor 110 in a clockwise direction.

The repulsive force and the attracting force are generated between the divided cores v14-v16 and the divided cores w14-w16 and the rotor 110, respectively, and the rotor 110 is pushed and pulled And rotates the rotor 110 clockwise.

Thereafter, the rotor 110 rotates by 7.5 degrees to the mechanical angle, and the Hall elements H1 to H3 detect the polarity of the rotor 110 as "S, N, S" It is determined that the rotational position of the rotor 110 is 7.5 deg. Accordingly, when the control unit applies the drive signal to turn on the upper FET 3 and the lower FET 4, the current flows through the FET 3-V phase coil (v 1 -v 3) -V phase coil (v 4 -v 6) W4) -W phase coil (w3-w1) -FET4.

As a result, the divided core v11 generates an inward magnetic flux, the divided core v12 generates a magnetic flux directed to the outward direction, the divided core v13 generates a magnetic flux directed to the inward direction, And the rotor 110 is rotated in the clockwise direction.

The divided cores v11-v13 connected in three in the BLDC motor 100a are arranged such that the left portion of the tooth is opposed to the opposing magnets 360, 365 and 370 of the rotor 110 with opposite polarities such as NS, SN and NS, The right portion of the teeth is arranged opposite to the magnets 365, 370 and 375 of the rotor 110 with the same polarity as NN, SS and NN, so that suction force is generated between the divided cores v11 to v13 and the rotor 110 A repulsive force is generated at the same time to rotate the rotor 110 clockwise.

The three wired divided cores u11 to u13 disposed adjacent to the three connected wired divided cores v11 to v13 are arranged such that the left portion of the tooth is connected to the corresponding one of the magnets 345, 350, and 355 of the rotor 110, NS and SN and the right portions of the teeth are disposed opposite to each other with the same polarity as NN, SS and NN between the opposing magnets 350, 355 and 360 of the rotor 110, a suction force and a repulsive force are simultaneously generated between the rotor 110 and the rotor 110 to rotate the rotor 110 in the clockwise direction.

The repulsive force and the attracting force are generated between the divided cores v14-v16 and the divided cores u14-u16 and the rotor 110, respectively, as described above, and the rotor 110 is pushed and pulled And rotates the rotor 110 clockwise.

As described above, in the present invention, the reverse coil winding is formed in the middle core among the three consecutive cores for each of the core groups (G1 to G6), and the reverse coil windings are symmetrically disposed on both sides The adjacent two core groups, that is, a pair of consecutive six divided cores are activated, and three consecutive divided cores disposed between a pair of consecutive six divided cores are inactivated.

In this case, when a driving signal is applied to each of the adjacent two core groups, the six divided cores included in the two core groups generate magnetic fluxes in opposite directions. A driving signal is applied to the one of the two adjacent core groups to which the activation is performed from the start terminal of the corresponding coil and the other terminal is applied to the other group from the end terminal of the corresponding coil.

In this case, a pair of consecutive six divided cores in which activation is performed are set so that the left sides of the teeth between the rotor 110 and the rotor 110 are set to have opposite polarities, so that the attracting force pulls the rotor 110 in the rotating direction, The rotor 110 is rotated in the rotating direction by the repulsive force.

That is, all three consecutive divided cores of the four core groups generate a magnetic flux which rotates the magnets of the opposed rotor 110 in the same direction, so that effective force transmission to the rotor is achieved.

Further, in the present invention, even when the interface between the S pole and the N pole magnet adjacent to each other in the rotor 110 facing the teeth of the divided cores is arranged, an effective magnetic circuit path is established without flux loss to rotate the rotor 110, As a result, it is possible to use the magnets magnetically split without rounding the corners of the adjacent S-pole and N-pole magnets, so that the effective areas of the magnets 345-390 corresponding to the divided cores (u11-u16, v11-v16, w11- And the efficiency can be increased.

Further, in the present invention, the coil winding is made so that a pair of consecutive six divided cores generate a magnetic flux in mutually opposite directions between adjacent divided cores, and even if the gap between the core and the core is set small The effective area between the magnet and the core is increased without leakage of the magnetic flux due to cogging, thereby reducing the leakage magnetic flux and increasing the efficiency.

The teeth of each of the segment cores u11-u16, v11-v16 and w11-w16 are rounded in order to increase the opening width between the slot and the slot and round the outer periphery. The cogging does not occur largely even if the curvature is set so as to coincide with one outer circle formed by the entire teeth of the eighteen divided cores as shown in Figs. 1A, 1B, and 3 without processing. As a result, it is possible to maximize the effective area between the magnets and the core, thereby reducing the leakage magnetic flux, thereby increasing the efficiency.

5 is a flowchart illustrating a method of driving a single rotor type BLDC motor according to an embodiment of the present invention.

Referring to FIG. 5, the position of the single rotor is determined based on the hall element (step S500).

Based on the rotor position signal detected from the Hall elements H1-H3, the single rotor type BLDC motor determines the current position of the rotor 110 in the six-step method shown in Table 2, for example, A pair of switching elements FET1 to FET6 to be turned on in the circuit 50 are determined.

The controller selects a pair of switching elements (FET1 to FET6) and applies a PWM driving signal to turn on the pair of switching elements (FET1 to FET6) (step S510).

For example, the V-phase coil (v1-v6) and the W-phase coil (w1-w6) as the pair of switching elements FET3 and FET2 are turned on. The currents flowing through the two phases are the currents flowing through the wound coils by making the three cores of the same phase different from each other in the direction of the windings based on the three-wire structure as described above.

When the position of the rotor is rotated by one step, that is, by 7.5 degrees in the same manner, the rotation of the rotor is detected from the Hall elements H1 to H3 so that the control unit turns on the pair of switching elements FET3 and FET4 Accordingly, current flows through the two phases, for example, the V-phase coil (v1-v6) and the U-phase coil (u1-u6).

According to the present invention, when the rotor position is detected in the Hall element according to the six-step driving method shown in Table 2, the control unit alternately switches a pair of switching elements of the inverter circuit on the basis thereof to generate a rotating magnetic field in the stator, The rotor is rotated in the same direction.

In the above embodiment, a single rotor motor having a stator as a divided core and combined with a rotor has been described as an example. However, the present invention is equally applied to an integrated core in which a plurality of teeth extend radially from a back yoke, Can be similarly applied to an inner rotor motor disposed inside the stator. Further, the present invention can be applied to the same principle in a double rotor-double stator structure motor having a magnetic circuit independent of the inside and the outside, in addition to the single rotor-single stator.

Although the radial gap type motor has been described by way of example in the above description, it may be applied to an axial gap type motor.

In the above description of the embodiment, the stator coil is star-connected by the three-phase driving method, but the present invention is also applicable to the delta wiring method.

In the above description of the embodiment, the rotor is used to detect the rotor position information, but it is also possible to use another magnetic detecting element for detecting a change in the polarity of the rotating rotor magnet.

In the above embodiment, the 18-hole 16-pole motor is exemplified. However, the motor can be applied to the motor of the 27-slot 24-pole, 36-slot 32-pole and 45-slot 40-pole.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

According to the present invention, as the coil winding is performed by a three-wire method so that a pair of consecutive six divided cores generate magnetic fluxes in opposite directions to each other between adjacent divided cores, the efficiency is increased as the cogging noise and the leakage magnetic flux are reduced And a BLDC motor and a motor driving method using the stator.

50: inverter circuit 100a: motor
110: rotor 120: stator
123: Back yoke 125: Bobbin
127: body 127a: engaging projection
127b: coupling groove 345-390: magnet
G1-G6: core group TFT1-TFT6: switching element
u1-u6, v1-v6, w1-w6: coils u11-u16, v11-v16, w11-w16:
NP: Neutral point H1-H3: Hall element

Claims (25)

A rotor in which a plurality of N poles and S pole magnets are alternately arranged; And
A stator disposed spaced apart from the rotor, the stator having a three-phase coil wound on a tooth of the core,
The coils are connected in a three-phase driving manner, and each of the coils of each phase is continuously wound in three consecutive teeth in the order of forward, reverse, and forward, and adjacent teeth generate magnetic fluxes in mutually opposite directions,
When a driving signal is applied to the coil of the stator in a six step manner, two consecutive six teeth are set to the active state, and one or more consecutive 3 teeth arranged between the consecutive teeth And the teeth of the rotor are set in the inactivated state. The single rotor type BLDC motor according to claim 1, wherein the number of magnets of the rotor is determined by (number of slots / 9) x 8, and the number of slots is set to a multiple of nine. The method according to claim 1,
The three-phase coil is wound on three consecutive teeth in each of U, V, and W phases in the forward, reverse, and forward directions, generates magnetic fluxes in opposite directions to each other between adjoining teeth, And a plurality of core groups arranged alternately for each phase,
And the six teeth included in two adjacent core groups generate a magnetic flux in directions opposite to each other when a driving signal is applied and activated for each of two adjacent core groups. The rotor according to claim 3, wherein six consecutive teeth included in the adjacent two core groups are all set to the same polarity or opposite polarity as the magnetic poles of the opposed rotor magnets, thereby rotating the rotor in the same direction Single rotor type BLDC motor. The method according to claim 1,
Three teeth in which the coils of each phase are continuously wound form one core group,
Each phase coil includes a plurality of core groups arranged alternately for each phase of U, V and W,
The six consecutive teeth included in the two adjacent core groups are set to the same polarity or opposite polarity as the magnetic poles of the magnets of the opposed rotor all when the drive signal is applied so that the rotor is rotated in the same direction Single rotor type BLDC motor. 4. The motor control device according to claim 3, further comprising three hall elements for detecting a position signal of the rotor,
The angle between the Hall elements may be set to (360 占 / number of slots) 占 or (360 占 / number of poles) 占 2 占 3,
And a drive signal for the coil is applied based on a combination of position signals of the rotor detected by the three Hall elements. 4. The motor control device according to claim 3, further comprising two hall elements for detecting a position signal of the rotor,
The angle between the Hall elements is set to (360 ° / number of poles) / 2,
And a drive signal for the coil is applied using a position signal of the rotor detected by the two Hall elements. The method according to claim 1,
The stator has a plurality of coils wound around a plurality of teeth determined by the phases of U, V and W (multiples of 9/3), and one side of each phase coil is connected to a U- , V and W outputs, and the other sides of the phase coils are mutually connected to form a neutral point (NP). The single rotor type BLDC motor according to claim 1, wherein the BLDC motor is driven in a six step manner, and the three-phase coil forms a neutral point by a star wiring method. 3. The method of claim 2,
Wherein the slot and the number of poles of the motor are set to any one of 18 slots 16 poles, 27 slots 24 poles, 36 slots 32 poles, and 45 slots 40 poles. 11. The method according to any one of claims 1 to 10,
Wherein the core of the stator is composed of a T-shaped tooth to which the coil is wound, and a plurality of divided cores including a body extending from the teeth and mutually coupled to form an annular back yoke. 12. The method of claim 11,
And the divided cores are assembled in an annular shape by coupling protrusions and coupling grooves formed in the body, respectively. 12. The method of claim 11,
Each of the plurality of teeth further including an insulating bobbin for insulating a coil wound around the outer circumference,
Wherein the plurality of teeth are assembled into an annular shape using a coupling structure formed on the bobbin. delete The method according to claim 1,
The six consecutive teeth are all set to the same polarity or opposite polarity as the magnetic poles of the opposed rotor magnets,
Wherein a part of the tooth is set to have a polarity opposite to that of the magnetic pole of the rotor and the remaining part of the tooth is set to have the same polarity as that of the magnetic pole of the opposed rotor to rotate the rotor in the same direction BLDC motor. A rotor in which a plurality of N poles and S pole magnets are alternately arranged; And
A stator disposed spaced apart from the rotor, the stator having a three-phase coil wound on a tooth of the core,
The coils are connected in a three-phase driving manner, and each coil of each phase is wound on three consecutive teeth in the order of forward, reverse, and forward,
When a drive signal is applied to the coil, six consecutive teeth of two phases out of three phases are set to an active state, and one consecutive three teeth disposed between the consecutive teeth are in a deactivated state And the magnetic flux is generated in opposite directions to the six consecutive driven teeth. 17. The method according to claim 16, wherein the six divided cores included in the two core groups generate a magnetic flux in directions opposite to each other, and the six consecutive divided cores are identical to the magnetic poles of the opposing inner rotor and outer rotor magnets Polarity or opposite polarity so as to rotate the rotor in the same direction. The single rotor type BLDC motor according to claim 17, wherein the number of magnets of the rotor is determined by (number of slots / 9) x 8, and the number of slots is set to a multiple of nine. A rotor in which a plurality of N poles and S pole magnets are alternately arranged; And
A stator disposed spaced apart from the rotor, the stator having a three-phase coil wound on a tooth of the core,
The number of magnets of the rotor is determined as (number of slots / 9) x 8, the number of slots is set to a multiple of nine,
The stator is wound on a plurality of teeth determined by each phase of U, V and W (multiples of 9/3)
The coils are connected in a three-phase driving manner, and each of the coils of each phase is continuously wound on three consecutive teeth in the order of forward, reverse, and forward,
When a driving signal is applied to the coil of the stator in a six step manner, two consecutive six teeth are set to the active state, and one or more consecutive 3 teeth arranged between the consecutive teeth And the teeth of the rotor are set in the inactivated state. A method of driving a three-phase driven BLDC motor,
A plurality of core groups in which three-phase coils are wound in the order of forward, backward, and forward directions on three consecutive teeth in each of U, V, and W phases, Preparing a three-phase drive type BLDC motor having a plurality of N-pole and S-pole magnets alternately arranged and connected to each other;
Determining a position of the rotor based on the rotor position signal detected by the rotor position detection element; And
Applying a drive signal to two or more of the three-phase coils based on the rotor position,
When driving signals are applied to the coils of the adjacent two core groups, the six teeth included in the two core groups generate magnetic fluxes in opposite directions to each other,
Wherein six consecutive teeth included in the adjacent two core groups are activated, and the remaining three teeth in the inactive state are disposed between the six teeth activated. delete 21. The method of claim 20,
Wherein driving signals are applied to the one of the two adjacent core groups from the start terminal of the corresponding coil and from the end terminal of the corresponding coil to the other group. 21. The method of claim 20,
The six consecutive teeth are all set to the same polarity or opposite polarity as the magnetic poles of the opposite rotor or the part of the teeth is set to the opposite polarity to the magnetic pole of the opposite rotor magnet, Is set to the same polarity as the magnetic pole of the rotor of the BLDC motor, and the rotor is rotated in the same direction. A core in which a plurality of teeth are radially extended from an annular back yoke; And
And a three-phase coil wound on each of the plurality of teeth,
The three-phase coil is wound in three forward direction, reverse direction, and forward direction on three divided cores successively formed for each phase so as to generate a magnetic flux in mutually opposite directions between adjacent teeth,
When a drive signal is applied to the coil, six consecutive teeth of two phases out of three phases are set to an active state, and one consecutive three teeth disposed between the consecutive teeth are in a deactivated state And a magnetic flux is generated in opposite directions to the six consecutive teeth that are activated. 25. The method of claim 24,
Wherein the core comprises a plurality of divided cores comprising a tooth to which the coil is wound and a body extending from the teeth and coupled to each other to form an annular back yoke.

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