KR101383257B1 - Stator Having 3-Core Connection Structure and BLDC Motor Using the Same - Google Patents

Abstract

The present invention can minimize the ratio of slots and poles as the coil winding is made by the three-wire method to reduce the cogging noise, and to set the effective area between the magnet and the core by setting a small distance between the core and the core. The present invention relates to a stator having a three-wire structure that can increase efficiency by increasing leakage flux and increasing a BLDC motor using the same, and a driving method thereof.
The present invention provides a rotor comprising: an outer rotor having an inner rotor and an outer rotor in which a plurality of N-pole and S-pole magnets of opposite polarity are alternately arranged at positions opposed to each other; And a stator disposed between the inner rotor and the outer rotor, the stator having a plurality of split cores wound around coils, wherein the coils are connected in a three-phase driving manner, and each phase coil is three consecutive split cores. The divided cores wound in the order of forward, reverse and forward directions are characterized in that magnetic flux is generated in opposite directions.

Description

Stator Having 3-Core Connection Structure and BLDC Motor Using the Same}

The present invention relates to a stator having a three-wire structure and a BLDC motor using the same. More specifically, as the coil winding is made by the three-wire method, the ratio of slots and poles can be minimized, thereby reducing cogging noise and reducing the core. The present invention relates to a stator with a three-wire structure and a BLDC motor using the same, which can increase efficiency by reducing the leakage magnetic flux by increasing the effective area between the magnet and the core by setting the distance between the core and the core to be small.

When the BLDC motor is classified according to the presence or absence of the stator core, it is generally divided into a core type (or radial gap type) having a cup (cylindrical) structure and a coreless type (or an axial gap type).

The BLDC motor of the core type has an inner magnet type comprising a cylindrical stator in which a coil is wound and a rotor made of a cylindrical permanent magnet in order to have an electromagnet structure in a plurality of projections (teeth) formed in an inner peripheral portion, And a rotor made of a cylindrical permanent magnet whose outer periphery is wound with a coil wound in a vertical direction on a projection of the outer magnet.

Since the core type BLDC motor has a structure in which the magnetic circuit is symmetrical in the radial direction about the axis, it is less in the axial vibration noise, is suitable for the low-speed rotation, The magnetic flux density can be obtained by using the magnets or by reducing the amount of magnets, which is advantageous in that the torque is large and the efficiency is high.

However, in such a core, that is, a yoke structure, a material loss of yoke is large when a stator is manufactured, and a dedicated expensive winding machine for winding a coil in the yoke due to the complicated structure of the yoke at the time of mass production must be used And the cost of equipment investment is high due to the high investment cost of the mold when the stator is manufactured.

In the core type AC or BLDC motor, particularly, in the radial gap type core motor, if the stator core is formed in a completely split type, the coils can be wound on the divided cores with high efficiency using a low cost general purpose winding machine. do. On the contrary, in the case of the integral-type stator core structure, since the expensive dedicated winding machine is used and the low efficiency winding is performed, the manufacturing cost of the motor is increased.

A BLDC motor of a radial gap type (core type) double rotor structure capable of improving the advantages of the axial gap type blotter motor and the radial gap type core motor and improving the disadvantages is proposed by the present applicant in Japanese Patent No. 10-432954 .

In the above-mentioned Japanese Patent No. 10-432954, permanent magnet rotors are disposed on the inner side and the outer side of the stator core at the same time, whereby the flow of the magnetic path is formed by the inner and outer permanent magnets and the rotor yoke, Thus, the productivity of the stator core can be improved by winding the individual coils by using the low-cost universal winding machine, the loss of the core material can be reduced, and a structure capable of greatly increasing the output of the motor by combining with the double rotor is proposed.

In addition, in the patent document 10-2005-245, since the connection structure of a general divided core is weak in durability, a plurality of split-type core assemblies in which the coils are wound are prepared, The present invention proposes an integrated stator by arranging and fixing it on a substrate (PCB), connecting the coil, and then molding it into a reduced shape by insert molding using a thermosetting resin. In addition, in the above-mentioned Japanese Patent Application Laid-Open No. 10-2005-245, a stator structure in which divided cores each having a stator coil wound is alternately arranged for each of U, V, and W phases is proposed.

On the other hand, in a general BLDC motor, a stator structure in which the winding order of the stator coils is alternately arranged for each phase of U, V and W in the integrated core is used. By sequentially switching the switching transistors of the inverter circuit, The alternating current to the stator coil is alternately generated to generate the rotating magnetic field and the rotor is driven to rotate.

For example, in the above-mentioned Japanese Patent Application Laid-Open Nos. 10-2005-245 and 10-2010-73449, there are provided a stator in which a plurality of divided cores wound with coils are alternately arranged for each of U, V and W phases One double rotor / single stator structure motor is proposed.

Hereinafter, a design method of a motor (hereinafter, referred to as a "one-wire structure motor") in which a split core in which a coil is wound for each phase is alternately arranged for each phase in a BLDC motor having 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).

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.

A description will now be given of a BLDC motor designed in accordance with one wiring method of a double rotor / single stator structure using a stator of a divided core type in which divided coils wound with conventional coils are alternately arranged for each phase, with reference to FIG. 1A to FIG. do.

FIG. 1A shows a structure of a BLDC motor of a moreover-designed BLDC motor designed in an 18-slot 12-pole system designed according to a conventional 1-wire method. FIG. 1B shows a structure of a BLDC motor of a BLDC motor, (U, V, W) drive coils applied to FIG. 1A, and FIG. 3 is a view showing a coil wiring diagram and a motor drive circuit of a three-phase (U, V, Fig.

Referring to FIGS. 1A to 3, BLDC motors 10 of a larger BLDC structure designed according to a conventional 1-wire method have coils u1-u6, v1-v6 and w1-w6, respectively, The inner rotor 3a and the outer rotor 3b are arranged such that N poles and S pole magnets are alternately arranged on the inner side and the outer side of the stator 1 in which the eighteen divided cores (u11-u16, v11-v16, w11- And the outer rotor 3b are disposed with an interval therebetween.

The stator 1 has six coils (u1-u6, v1-v6, w1-w6) interconnected by U, V and W phases and one side of each of the phases constitutes a motor drive circuit V, and W outputs of the inverter circuit 5, and the other side of each phase is mutually connected to form a neutral point (NP).

The stator coils u1-u6, v1-v6 and w1-w6 are all wound in the forward direction on the divided cores u11-u16, v11-v16 and w11-w16, W phases are alternately arranged and assembled. That is, 18 divided cores (u11-u16, v11-v16, w11-w16) are assembled in the order of u1, v1, w1, u2, ..., w5, u6, v6, w6, And is formed into an annular shape integrated with the stator support body.

Hereinafter, operation of the BLDC motor 10 having a more blister structure designed according to the conventional 1-wire 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 rotors 3a and 3b and transmits them to the motor driving circuit.

The motor shown in Fig. 1A shows a state at 0 DEG. By switching the directions of the currents flowing through the stator coils u1-u6, v1-v6 and w1-w6 every 10 degrees in a six- The divided cores u11-u16, v11-v16, w11-w16 form an electromagnet, and a magnetic field is generated.

The motor drive circuit includes a control unit (not shown) and an inverter circuit 11. The inverter circuit 5 includes three pairs of switching transistors (FETs) connected to each other by totem poles. The upper FETs FET1, FET3, FET5 And outputs to the stator coils u1-u6, v1-v6 and w1-w6 of the motor 10 are generated from the connection points between the lower FETs (FET4, FET6 and FET2) do.

When the position signals of the rotors 3a and 3b are detected by the Hall elements H1 to H3 at the respective angles, the control unit (not shown) of the motor driving circuit detects the position of the rotor 3a The switching transistor (FET) of the transistor Q1 is turned on to set the current flow path.

For example, when the Hall elements H1 to H3 detect the polarity of the outer rotor 3b as "N, S, S ", as shown in Fig. 1A, the controller determines that the rotor rotational position is 0 deg. (U1-u6) -W phase coil (w6-w1) -FET2 to the ground when the driving signal is applied to turn on the FET1 and the lower FET2 of the FET1-U.

As a result, a magnetic flux is generated in the divided core (u11) in the inward direction and a magnetic flux in the outward direction is generated in the divided core (w11) And the rotor 3b in which the N pole and the S pole magnets are opposed to each other is rotated in the clockwise direction.

In the BLDC motor 10 shown in Fig. 1A, for example, the divided core u11 for generating the magnetic flux in the inward direction preferably has the outer side of the core facing only the N pole magnet 13 of the outer rotor 3b, It is preferable that a part of the core u11 also faces the adjacent S pole magnet 14 and only the S pole magnet 13a of the inner rotor 3a confronts the inside of the core, Pole magnet 14a adjacent to the adjacent N pole magnet 14a.

In this case, the divided cores u11-u16, v11-v16, w11-w16 of the stator 1 in the BLDC motor 10 are divided into cores corresponding to one phase of U, V, A drive signal is applied to the coil to skip the activation.

For example, when the rotational position of the rotor 3 is 0 °, as shown in FIG. 1A, the divided cores u11-u16 and w11-w16 of the stator 1 filter the divided cores v11- The driving signal is applied to the coils u1-u6 and w1-w6 wound on the two consecutive divided cores u11-u16 and w11-w16 on the continuous division The cores generate magnetic fluxes in mutually opposite directions.

At this time, in the BLDC motor 10, the outer side of the divided core u11 faces the S pole magnet 14 adjacent to the N pole magnet 13, and the inner side of the divided core u11 is the S pole The divided core v11 in the inactive state is disposed between the S pole magnet 14 and the N pole magnet 14a facing each other so as to face the adjacent N pole magnet 14a in addition to the magnet 13a, 3) in one direction can not be achieved.

In the motor shown in FIG. 1A, the smaller the number of slots, the more the noise is generated because the adjacent S pole magnets and the N pole magnets overlap each other.

In addition, the BLDC motor 10 designed according to the conventional 1-wire method has a configuration in which the slot and the pole of the motor are set as 18 slots 12 poles, 27 slots 36 poles, 36 slots 48 poles, (Magnetic flux) between the magnets 13-16 and the core is generated according to the rotation angle at the time of rotation of the rotor 3. As a result, cogging is severely caused And leakage of magnetic flux occurs.

Accordingly, in order to minimize the noise caused by cogging, the conventional 1-wire type BLDC motor 10 has a wide opening width between the slot and the slot, (R), or to edge-process the rounded portion of each of the magnets 13-16, which leads to an increase in production cost and a decrease in efficiency.

As a result, the conventional 1-wire BLDC motor 10 should have a wide opening width between the slot and the slot so that the efficiency is good, the noise is reduced, and the opening width is larger than a certain level.

In addition, the conventional 1-wire BLDC motor 10 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, since the conventional 1-wire BLDC motor 10 must be sequentially arranged at an angle determined by (360 degrees / number of slots) the Hall elements H1 to H3 as described above, There is a problem that the Hall element printed circuit board (PCB) to be mounted must have a size covering an angle in the range of 40 degrees.

On the other hand, the above-mentioned Japanese Patent Application Laid-Open No. 10-2005-245 has a problem that an expensive large-sized printed circuit board (PCB) must be used for wire connection and assembly of a plurality of split core assemblies, And proposed a registered patent No. 10-663641 in order to solve the wiring problem.

No. 10-663641 discloses a method in which coils are sequentially wound in forward directions on nine divided cores allocated to each phase of U, V and W, and these are grouped into three core groups, and three connected 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.

Korean Patent No. 10-432954 Korean Patent Laid-Open No. 10-2005-245 Korean Patent Laid-Open No. 10-2010-73449 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 having a three-wire structure capable of reducing the leakage magnetic flux by increasing the effective area between the magnet and the core by setting a small gap between the core and the core, and a BLDC motor using the same and a driving method thereof There is.

It is another object of the present invention to provide a method and apparatus for controlling three consecutive three coils in such a way that when the same motor drive signal is applied to three consecutive coils, And a stator having a three-wire structure in which a reverse coil winding is formed on a core positioned in the middle of the core.

Another object of the present invention is to provide a double rotor in which opposite end portions of the core are overlapped with each other between adjacent S poles and N pole magnets, The present invention provides a BLDC motor using a stator having a three-wire structure in which an effective magnetic flux path is set so that the effective area of the magnet is increased and the efficiency is increased.

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 of a three-wire structure which is simple in winding method and wire connection method according to a continuous winding method using a three-wire method in a divided core.

Another object of the present invention is to provide a stator of a three-wire structure that does not need round processing of the stator core and the corner portion of the magnet, as the opening width of the core narrows, To provide a BLDC motor.

It is still another object of the present invention to provide a method of driving a three-phase driving circuit in which a plurality of divided cores are arranged in the same direction between an inner rotor and an outer rotor, The present invention is to provide a new motor drive method of a three-wire structure in which attractive force and repulsive force are generated at the same time so that rotational drive to the 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, a BLDC motor according to the present invention includes: a rotor having an inner rotor and an outer rotor alternately arranged with a plurality of N-pole and S-pole magnets having opposite polarities at mutually opposite positions; And a stator disposed between the inner rotor and the outer rotor, the stator having a plurality of split cores wound around coils, wherein the coils are connected in a three-phase driving method, and each phase coil is three consecutive split cores. The divided cores wound in the order of forward, reverse and forward directions are characterized in that magnetic flux is generated in opposite directions to each other.

According to another feature of the present invention, the motor driving method of the three-phase drive BLDC motor of the present invention is a three-phase coil in the order of the forward, reverse and forward directions to three consecutive divided cores for each of the U, V, W phases; To prepare a three-phase drive type BLDC motor having a double rotor coupled to a stator that is wound, and a plurality of core groups that generate magnetic flux in opposite directions between adjacent split cores are alternately arranged for each of U, V, and W phases. step; Periodically detecting the rotor position signal using the rotor position detection element; And sequentially applying driving signals to two of the three-phase coils based on the rotor position signal, and included in the two core groups when the driving signal is applied and activated every two adjacent core groups. The six divided cores generate magnetic flux in opposite directions.

According to another feature of the invention, the stator is connected to the three-phase drive method of the present invention comprises a plurality of split cores; And a three-phase coil wound around each of the plurality of split cores, wherein the three-phase coils are wound around three divided cores successively for each of the U, V, and W phases in the order of forward, reverse, and forward directions. And a plurality of core groups generating magnetic flux in opposite directions between the divided cores.

According to another feature of the invention, the stator is connected to the three-phase drive method of the present invention is an integral core with a plurality of teeth protruding from the back yoke; And a three-phase coil wound around each of the plurality of teeth, wherein the three-phase coil is wound on three consecutive teeth for each of U, V, and W phases in the order of forward, reverse, and forward directions. It characterized in that it comprises a plurality of core groups for generating magnetic flux in the opposite direction between each other.

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

Further, in the present invention, when reverse coil windings are formed in the middle core of three consecutive cores, when the same phase motor drive signal is applied to three consecutive coils, all three cores are opposed to each other A magnetic flux for rotating the magnet of the rotor in the same direction is generated, so that effective force transmission to the rotor is achieved.

Further, in the present invention, coil winding is performed by the three-wire method, and the three cores operate as one set, so that even if there is a portion overlapping between the adjacent S poles and N pole magnets in the double rotor opposed to both ends of the core, The flux path is set 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 and the magnet.

As the drive signal is switched between the winding direction and the three-phase drive circuit so that magnetic fluxes are generated in the directions opposite to each other, the suction force and the repulsion force are generated in the same direction between the inner and outer rotors, So that the rotation drive to the rotor can be effected effectively.

FIG. 1A is a radial cross-sectional view of a BLDC motor of a more rotor structure designed in an 18-slot 12-pole fashion in accordance with one prior art wiring method; FIG.
Fig. 1B is a radial cross-sectional view showing the structure of a BLDC motor of a further rotor structure made of a core and a magnet of a deformed shape to reduce cogging noise, Fig.
FIG. 2 is a view showing a coil wiring diagram of the three-phase (U, V, W) drive coil applied to FIG. 1A,
Fig. 3 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. 1,
4A and 4B are BLDC motors of a double rotor structure designed in an 18-slot 16-pole method according to a three-wire method according to an embodiment of the present invention, respectively, illustrating when the rotors are “0 °” and “7.5 °”. Radial section,
Fig. 5 is a view showing a coil wiring diagram of the three-phase (U, V, W) drive coil shown in Fig. 4,
Fig. 6 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. 4,
FIGS. 7A and 7B are diagrams showing the connection of the divided cores and the jig for continuous winding by the three-wire method according to the present invention to the six divided cores, and the connection diagrams of the stator coil continuously wound on the six divided cores,
Fig. 8 is a sectional view in the radial direction when the rotor for explaining the arrangement position of the modified Hall element according to the present invention is in the " 0 " position.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: It can be easily carried out.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the following description of the embodiment, a motor in which a stator having a divided core structure and a rotor are combined will be described as an example, but the present invention is also applicable to a motor constituted by combining a single rotor with a stator having an integral core structure.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4A and 4B show diameters when the BLDC motors of the double rotor structure designed in the 18-slot 16-pole method according to the three-wire method according to the embodiment of the present invention are "0 °" and "7.5 °", respectively. Directional sectional drawing, FIG. 5 is a coil connection diagram and a motor driving circuit of the three-phase (U, V, W) driving coil shown in FIG. 4, and FIG. It is explanatory drawing which shows connection relationship.

Referring to FIGS. 4A and 6, the BLDC motor 100 of the three-wire method according to an embodiment of the present invention is designed, for example, in an 18-slot 16-pole manner according to the three-wire method of the present invention, Core stator 102-further blotter 103 structure.

In the following, in the BLDC motor 100 having the split core stator 102 according to the present invention, three split cores in which coils are wound for each phase are alternately disposed for each phase (hereinafter referred to as a "three-wire structure motor"). The design method is explained.

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:

In Equation (2), the number of slots is determined to be a multiple of 9, and the number of slots and poles of the motor is set to a ratio, for example, 18 slots 16 poles, 27 slots 24 poles, 36 slots 32 poles, have. Therefore, in the present invention, the ratio of the number of slots to the number of poles is about 12%, which causes the cogging generated at the time of rotation of the rotor to be reduced to about 1/10 compared to the one-wire connection method. The spacing between the cores (i.e., slots and slots) is set narrow, as a result of which the effective effective area between the magnet and the core increases, so that 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 can use, for example, two or three holes in the case of a three-phase driving method.

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.

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

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 divided cores according to 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.

4A to 6, the BLDC motor 100 of the BLASTER structure designed according to the three-wire method of the present invention has the coil (u1-u6, v1-v6, w1-w6 The stator 102 has annularly arranged 18 divided cores (11-u16, v11-v16 and w11-w16) wound on the inner and outer sides of the stator (102) And further includes a further rotor 103 in which an inner rotor 103a and an outer rotor 103b which are alternately arranged are disposed with an interval therebetween.

The inner rotor 103a and the outer rotor 103b are integrally formed by a rotor support member (not shown) and the inner rotor 103a and the outer rotor 103b are integrated with each other. (Not shown) is coupled to a central portion of the rotating shaft 103a, and a load is connected to one end of the rotating shaft.

The inner rotor 103a and the outer rotor 103b are arranged such that the magnets 11-26 (11a-26a) facing each other have opposite polarities. The inner rotor 103a and the outer rotor 103b are each provided with an annular back yoke (arrow portion) on the inner circumference and the outer circumference to form a magnetic circuit path between adjacent magnets, respectively, but are omitted for convenience of description.

The stator 102 is connected to six coils u1-u6, v1-v6 and w1-w6 for each U, V and W phase, 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-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), G6 (w14, w15, w16) and integrated into the stator support by insert molding using resin to form annular shapes. The divided cores u11-u16, v11-v16 and w11-w16 are connected to the insulating bobbins 61 formed on the outer periphery of the core for insulation when the stator coils u1-u6, v1-v6 and w1- -66), and can be assembled into an annular shape by another assembling method using the same.

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.

As will be described later, the eighteen divided cores (u11-u16, v11-v16, w11-w16) of the stator 102 as a whole are arranged such 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.

Fig. 7 shows a method of winding the coils in the six cores by the continuous winding method.

As shown in the figure, six U-phase divided cores u11-u16 are assembled in a line by using five jigs 55, and then, by using a winding machine as shown in Japanese Patent No. 10-663641, (Four jigs are not shown in Fig. 7). 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).

7, insulating bobbins 61-66 are integrally formed on the outer periphery of the divided cores u11-u16, v11-v16 and w11-w16 of the present invention, and each of the bobbins 61- 66 are provided with outer and inner flanges 67 and 68 on both sides so as to set the coil winding region and the inner flange 68 is provided with a coupling protrusion 69a and a coupling groove 69b used for mutual coupling of the bobbins Respectively.

The operation of the BLDC motor 100 according to the third embodiment of the present invention, which is designed according to the three-wire method of the present invention, will be described with reference to Table 2 below with reference to FIGS. 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. 4A, three Hall elements H1 to H3 are arranged in every three slots, that is, every 60 degrees according to Equation (4) -H3) may be arranged every 15 [deg.] Calculated according to Equation (3) above 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.

Hall elements H1 to H3 detect magnetic poles (N poles or S poles) of the rotors 103a and 103b for each step and transmit them to the motor driving circuit.

The motor shown in FIG. 4A shows a state at 0 °, and the direction of the current flowing in the stator coils (u1-u6, v1-v6, w1-w6) V11, v11, v11, v11, v11, v11, v11, v11, v11, v11 and v11,

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 points between the FETs 3 and 5 and the lower FETs (FET4, FET6, and FET2) to generate stator coils u1-u6, v1-v6, and w1-w6 .

When the motor 100 is a three-phase drive system, the stator 102 includes three coils (u1-u6, v1-v6, w1-w6). For example, Are connected to each other to form a neutral point (NP).

The BLDC motor 100 selectively drives two switching elements among the three pairs of switching elements connected to the totem pole based on the position signal of the rotor 103 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 the position signals of the rotors 103a and 103b are detected by the Hall elements H1 to H3 at the respective angles, the control unit (not shown) of the motor drive circuit controls the inverter circuit 50 according to Table 2 The switching element (FET) of the switching element (FET) is turned on to set the current flow path.

For example, when the Hall elements H1 to H3 detect the polarity of the outer rotor 103b as "N, N, S" as shown in FIG. 4A, (V1-v3) -V phase coil (v4-v6) -W phase coil (v1-v3) when the drive signal is applied so that the upper FET 3 and the lower FET 2 are turned on, (w6-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 as shown in FIG. 10B, and the rotor 103 in which the inner rotor 103a and the outer rotor 103b are opposed to each other by N pole and S pole magnets is rotated in the clockwise direction.

Namely, the divided right and left outer cores v11-v13 of the BLDC motor 100 shown in Fig. 4A are connected to the outer magnets 16-18 of the outer rotor 103b by SS, NN, SS The right inner side portions of the divided cores v11 to v13 are disposed opposite to each other with the same polarity as NN, SS, and NN between opposing magnets 16a to 18a of the inner rotor 103a A repulsive force is generated between the divided cores v11-v13 and the blotter 103. [

The left outer portion of the outside of the divided cores v11 to v13 has a relatively smaller area than the outer right portion of the divided cores v11 to v13 and the opposing magnets 15-17 of the outer rotor 103b, And inner left portions of the divided cores v11-v13 are arranged opposite to each other such as SN, NS, SN between opposing magnets 16a-18a of the inner rotor 103a, a suction force is generated between the blades (v11-v13) and the blotter (103).

Therefore, a small attractive force and a large repulsive force are generated simultaneously between the divided cores v11-v13 and the blotter 103, and the operation of rotating the blotter 103 in the clockwise direction also occurs.

The three wired divided cores w11-w13 arranged at the rear end adjacent to the three wired divided cores v11-v13 each have an outer left portion connected to the opposing magnets 18-20 of the outer rotor 103b, Opposite to each other such as SN, NS, and SN, and the right side portion of the outer side is opposed to the opposing magnets 19-21 of the outer rotor 103b with the same polarity as NN, SS, and NN The left inner side portions of the divided cores w11 to w13 are opposed to each other with mutually opposite polarities such as NS, SN and NS between opposing magnets 18a to 20a of the inner rotor 103a, The attracting force and the repulsive force are generated between the divided cores w11-w13 and the rotor 103 because the magnets 19a-21a of the rotor 103a are arranged opposite to each other with the same polarity as NN, SS, And the action of rotating the blotter 103 in the clockwise direction occurs.

The repulsive force and the attracting force are generated between the three divided wired cores v14-v16 and the divided cores w14-w16 and the blotter 103 in the same manner as described above to further push the blotter 103 Thereby rotating the blotter 103 clockwise.

Referring to FIG. 4B, when the Hall elements H1-H3 detect the polarity of the external rotor 103b as "S, N, S", the controller determines that the rotational position of the double rotor 103 is in accordance with Table 2 above. The drive signal is applied to turn on the upper FET3 and the lower FET4 by judging that the angle is 7.5 degrees. It flows to ground via the coil w6-w4-W phase coil w3-w1-FET4.

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 as shown in FIG. 10B, and the rotor 103 in which the inner rotor 103a and the outer rotor 103b are opposed to each other by N pole and S pole magnets is rotated in the clockwise direction.

Namely, the divided cores v11-v13 connected by three in the BLDC motor 100 of Fig. 4B have NS, SN, NS and the like between the opposing magnets 15-17 of the outer rotor 103b, V11 and v13 are opposite to each other with opposite polarities and the outer right portion faces the opposing magnets 16-18 of the outer rotor 103b with the same polarity as NN, SS and NN, NS and SN between the opposing magnets 15a-17a of the inner rotor 103a and the inner right portion of the inner rotor 103a faces the opposing magnet The suction force and the repulsive force are generated between the divided cores v11-v13 and the blotter 103 at the same time because of the same polarity as NN, SS and NN, To rotate in a clockwise direction.

The three wired divided cores u11-u13 disposed at the front end adjacent to the three wired divided cores v11-v13 each have the outer left portion connected to the opposing magnets 12-15 of the outer rotor 103b, Opposite to each other such as SN, NS, and SN, and the right side portion of the outer side is opposed to each other with the same polarity as NN, SS, and NN between opposing magnets 13-15 of the outer rotor 103b The left inner side portions of the divided cores u11-u13 face each other with opposite polarities such as NS, SN, and NS between opposing magnets 12a-15a of the inner rotor 103a, The attracting force and the repulsive force are generated between the divided cores u11-u13 and the rotor 103 because the magnets 12a-15a of the rotor 103a are arranged opposite to each other with the same polarity as SS, NN, So that the action of rotating the blotter 103 in the clockwise direction occurs.

The repulsive force and the attracting force are generated between the divided cores v14 to v16 and the divided cores u14 to u16 and the blotter 103 in the same manner as described above to further push the blotter 103 Thereby rotating the blotter 103 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 side of the outer side and the inner side flange 60b, 60a with respect to the blotter 103 are set to the opposite polarity to each other, The right and left sides of the outer and inner flanges are set to have the same polarity to each other, so that the action of pushing the blotter 103 further in the rotating direction is performed 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 further blotters 103 in the same direction, so that effective force transmission to the rotor is achieved.

In the present invention, an effective magnetic circuit path is set without flux loss even when the interface is disposed between adjacent S poles and N pole magnets in a further rotor 103 opposed to both ends of the divided core, And the magnets 11-16 (11a-11a) corresponding to the divided cores (u11-u16, v11-v16, w11-w16) can be used as the magnets 26a can be increased 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.

Conventionally, it has been required to enlarge the opening width between the slot and the slot and round the outer circumference. However, in the present invention, the inside and outside of each of the divided cores u11-u16, v11-v16 and w11- The flanges 60a and 60b are not subjected to a round process and cogging occurs largely even though the curvatures are set so as to match one inner circle and outer circle formed by all the eighteen divided cores as shown in Figs. 4A and 4B . 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.

In the above description of the embodiment, the stator is a divided core and the blotter is combined with the blotter. However, the present invention can be applied to a single rotor-single stator or a double rotor stator . The present invention can be applied to an axial gap type motor other than the above-described radial 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.

Although the motor of the 18-hole 16-pole structure is illustrated in the above description of the embodiment, it can be applied to the motor of the 27-slot 24-pole and the 36-slot 32-pole in the same manner.

11-26, 11a-26a: Magnet 50: Inverter circuit
55: Jig 60a: Inner flange
60b: outer flange 61-66: bobbin
67: outer flange 68: inner flange
69a: engaging projection 69b: engaging groove
100: motor 102:
103: the blotter 103a: the inner rotor
103b: outer rotor G1-G6: core group
u1-u6, v1-v6, w1-w6: coils u11-u16, v11-v16, w11-w16:
NP: Neutral point

Claims (16)

A further rotor having an inner rotor and an outer rotor in which a plurality of N poles and S pole magnets of opposite polarity are alternately arranged at positions opposite to each other; And
A stator disposed between the inner rotor and the outer rotor, the stator having a plurality of split cores wound around coils;
The coils are connected in a three-phase driving method, and coils of each phase are wound in a sequence of forward, reverse, and forward directions on three consecutive split cores, so that adjacent split cores generate magnetic flux in opposite directions.
The plurality of split cores further include an insulating bobbin for insulating the coil wound around the outer periphery, wherein the plurality of split cores are assembled in an annular shape using a coupling structure formed on the inner flange of the bobbin. . delete The method of claim 1,
The three-phase coil is wound in three successive split cores in each of U, V, and W phases in the order of forward, reverse, and forward directions to generate magnetic flux in opposite directions between adjacent split cores. Including;
The plurality of core groups are assembled alternately arranged for each of the U, V, W phase,
A BLDC motor, characterized in that, when a driving signal is applied and activated every two adjacent core groups, six split cores included in the two core groups generate magnetic fluxes in opposite directions. 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 is set to (360 ° / number of poles) × 2 ÷ 3,
The drive signal for the coil is applied based on a combination of the 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,
The drive signal for the coil is applied using a position signal of the rotor detected by the two Hall elements. The method of claim 3, wherein the six split cores included in the two core groups generate magnetic fluxes in opposite directions, and the six consecutive split cores are all equal to the magnetic poles of the opposing inner rotor and the outer rotor. BLDC motor, characterized in that it is set to the polarity or the opposite polarity, to rotate the rotor in the same direction. The method of claim 1,
The stator is connected to each other by winding coils on divided cores determined by U, V, and W phases (multiple of 9/3), and one side of each of the stators is U, V, of an inverter circuit included in a motor driving circuit. BLDC motor, characterized in that connected to the W output, the other side of each phase is connected to each other to form a neutral point (NP). delete The method of claim 1,
When the BLDC motor detects the rotor position signal for each angle between the Hall elements in a six step manner and sequentially applies current to two of the three-phase coils, six consecutive split cores are activated. , The remaining split cores in an inactive state are placed between six split cores with three successive split cores enabled,
The six consecutive split cores are all set to the same polarity or opposite polarity as the magnetic poles of the opposing inner and outer rotors, or some of the split cores are opposite the polarities of the magnetic poles of the opposing inner and outer rotors. And the remaining portion of the split core is set to the same polarity as the magnetic poles of the magnets of the opposite inner rotor and outer rotor to rotate the rotor in the same direction. delete delete delete delete delete In the stator connected by the 3-phase driving method,
Multiple split cores; And
A three-phase coil wound around each of the plurality of split cores,
The three-phase coil is wound in three successive split cores in each of U, V, and W phases in the order of forward, reverse, and forward directions to generate magnetic flux in opposite directions between adjacent split cores. Including,
The plurality of split cores further include an insulating bobbin for insulating the coil wound around the outer periphery, wherein the plurality of split cores are assembled in an annular shape using a coupling structure formed on the inner flange of the bobbin. Structure stator. delete

Images