JP2013158072A - Outer rotor type motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer rotor type motor facilitating coil wiring work thereof.SOLUTION: Disclosed is a motor comprising: a plurality of stator units in even numbers arranged concentrically with a prescribed difference in angle in the circumferential direction; a plurality of coils for separately exciting the plurality of stator units; and an outer rotor arranged on the outer circumference of the plurality of stator units. Each of the plurality of stator units includes a first and a second stator with a prescribed difference in angle in the circumferential direction, the first stator comprising: a first disc part; and a plurality of first teeth provided in the first disc part with equal intervals and projecting toward the second stator side, and the second stator comprising: a second disc part; and a plurality of second teeth provided in the second disc part with the same interval, size, and number as the plurality of first teeth and projecting toward the first stator side, the plurality of the first and the second teeth being arranged alternately in an outer circumferential direction of the stator unit.

Description

  The present invention relates to an outer rotor type motor.

  In an outer rotor type motor, it is common to pass a coil through a stator (see Patent Document 1).

JP 2007-049844 A

  As the outer rotor type motor is reduced in size, it is difficult to wire such coils.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an outer rotor type motor that facilitates coil wiring work.

  The object is to provide an even number of stator units arranged concentrically with a predetermined angular difference in the circumferential direction, a plurality of coils for exciting each of the plurality of stator units, and a plurality of stator units. An outer rotor disposed on an outer periphery, each of the plurality of stator units including first and second stators having a predetermined angular difference in the circumferential direction, wherein the first stator is a first disc portion A plurality of first teeth provided at equal intervals on the first disc portion and projecting toward the second stator, wherein the second stator is provided on the second disc portion and the second disc portion. The plurality of first teeth include a plurality of second teeth that have the same interval, size, and number and protrude toward the first stator, and the plurality of first and second teeth are alternately arranged in the outer circumferential direction of the stator unit. The plurality of coils At least one end portion is achieved by an outer rotor type motor that is linearly drawn to the outer peripheral portion of the plurality of stator units and passes between the first and second teeth adjacent to each other of each stator unit. it can.

The object is to provide a plurality of stator units arranged concentrically with a predetermined angular difference in the circumferential direction, a plurality of coils for exciting each of the plurality of stator units, and an outer periphery of the plurality of stator units. Each of the plurality of stator units includes first and second stators having a predetermined angular difference in the circumferential direction, and the first stator includes a first disc portion, A plurality of first teeth provided at equal intervals on the first disc portion and projecting toward the second stator; the second stator provided on the second disc portion and the second disc portion; Including a plurality of second teeth having the same interval, size, and number of the first teeth protruding toward the first stator, wherein the plurality of stator units are arranged in order in one axial direction. Each stator unit The number of the first and second teeth of the stator unit is P, the angular difference in the circumferential direction of the first and second stators of each stator unit is θ1, and the circumference of the first and second stator units is The angle difference between the directions is θ2, n is an integer, the outer diameter of the coil is Φ, and the straight line connecting the two sharpest angles among the straight lines connecting the tips of the first teeth of each stator unit. The angle with respect to the axial direction is θa, and the angle of a straight line connecting the tips of the first and second teeth adjacent to each stator unit with respect to the axial direction is θb. The distance between the second stator is L1, and each of the first and second teeth has a height from the first or second disk portion of L2, a tooth tip width of L3, a tooth root width of L4, And facing each other through the center of the first stator The distance between the first tooth is 2r, plate thickness in the axial direction of the first stator When t,
(2π / P) − (π / 6P) ≦ θ1 ≦ (2π / P) + (π / 6P)
((Θ1 / 4) + 2πn) − (θ1 / 6) ≦ θ2 ≦ ((θ1 / 4) + 2πn) + (θ1 / 6)
L = ((2L2-L1) ² + (θ1r−L3) ² ) ^1/2
Lsin (θb−θa) ≧ Φ
α = tan ⁻¹ ((L4−L3) / 2L2)
α ≦ θa
θa = tan ⁻¹ (rθ2 / (L1 + 2t))
θb = tan ⁻¹ ((rθ1-L3) / (2L2-L1))
It can also be achieved by an outer rotor type motor that satisfies the above.

  ADVANTAGE OF THE INVENTION According to this invention, the outer rotor type | mold motor with easy coil wiring work can be provided.

FIG. 1 is a cross-sectional view of a motor. FIG. 2 is an external view of the stator unit group. FIG. 3 is a front view of the stator. FIG. 4 is a development view of the stator unit group. FIG. 5 is an explanatory diagram of the angular difference in the circumferential direction between the stator unit and the stator. FIG. 6 is an explanatory diagram of the shape and size of the teeth of the stator

  FIG. 1 is a cross-sectional view of the motor M. The motor M includes coils 30a to 30d, a rotor 40, stator units A to D, terminals CN, a support plate 80 that supports these members, and the like. The terminal CN is a resin member used as a base material and the conductive member is held. However, instead of the terminal CN, a printed circuit board on which a conductive pattern is formed may be used. Stator unit A includes stators 10a and 20a. Similarly, the stator unit B includes the stators 10b and 20b, the stator unit C includes the stators 10c and 20c, and the stator unit D includes the stators 10d and 20d. A yoke 44 is fixed to one end of the rotation shaft 42 of the rotor 40, and the other end of the rotation shaft 42 projects through the support plate 80. Stator units A to D are arranged in order from one end side to the other end side of the rotating shaft 42. Specifically, the stators 10a, 20a, 10b, 20b, 10c, 20c, 10d, and 20d are disposed from one end side to the other end side of the rotating shaft 42. The stators 10a to 10d and 20a to 20d are made of metal and fixed so as not to rotate. Stator units A to D are examples of first to fourth stator units, respectively.

  The coil 30a is disposed between the stators 10a and 20a. Similarly, the coil 30b is disposed between the stators 10b and 20b, the coil 30c is disposed between the stators 10c and 20c, and the coil 30d is disposed between the stators 10d and 20d. Each of the coils 30a to 30d is wound around the same axis on a separate part such as a coating film or a coil bobbin which is not shown and has an insulating function and is attached to the stator. The coils 30a to 30d are wound around the rotation shaft 42, respectively. Both ends of the coils 30a to 30d are connected to the terminal CN.

  The rotor 40 includes a rotating shaft 42, a yoke 44, and one or more permanent magnets 46. The rotating shaft 42 is rotatably supported by bearings B1 and B2. A yoke 44 is fixed to the distal end side of the rotating shaft 42, and the yoke 44 rotates together with the rotating shaft 42. The yoke 44 is substantially cylindrical. A plurality of permanent magnets 46 are fixed to the inner peripheral side surface of the yoke 44 so as to be arranged in the circumferential direction. The plurality of permanent magnets are arranged so that the polarities of the magnetic poles on the surfaces facing the stator units A to D are alternately different. The permanent magnet 46 faces the outer peripheral surfaces of the stators 10a to 10d and 20a to 20d. Specifically, a plurality of teeth provided on each of the stators 10 a to 10 d and 20 a to 20 d face the permanent magnet 46. When the coils 30a to 30d are energized, the stator units A to D are excited. Therefore, a magnetic attractive force and a repulsive force act between the permanent magnet 46 and the stator units A to D. The rotor 40 rotates relative to the stator units A to D by the action of the magnetic force. Thus, the motor M is an outer rotor type motor in which the rotor 40 rotates.

  FIG. 2 is an external view of the stator unit group SG. In addition, although mentioned later in detail, in FIG. 2, it has abbreviate | omitted about the edge part of the coil wired by the outer periphery of these stator unit groups SG. The stator 10a includes a substantially disk-shaped disk part 11a and a plurality of teeth 13a protruding in the axial direction from the outer edge of the disk part 11a. The plurality of teeth 13a are provided at predetermined equal intervals. Similarly, the stator 20a also includes a disk portion 21a and a plurality of teeth 23a. The stators 10a and 20a are arranged to face each other with a predetermined angular difference in the circumferential direction. Moreover, it arrange | positions so that the tooth | gear 23a of the stator 20a may be located between the teeth | gears 13a of the stator 10a, and it arrange | positions so that the teeth 13a and 23a may not contact.

  Similarly, the stators 10b to 10d also have disk portions 11b to 11d and teeth 13b to 13d, respectively. The stators 20b to 20d also have disk portions 21b to 21d and teeth 23b to 23d, respectively. The stators 10a to 10d and 20a to 20d have substantially the same shape and size. Specifically, the tooth interval, size, and shape are the same as those of other teeth. Moreover, although mentioned later in detail, each stator unit AD is arrange | positioned with a predetermined angle difference.

  FIG. 3 is a front view of the stator 10a. In the present embodiment, the stator 10a is provided with twelve teeth 13a on the edge of the disc portion 11a. Similarly, the other stators are provided with 12 teeth in this embodiment. As shown in FIG. 3, a through hole 15a through which the rotating shaft 42 passes is provided at the center of the stator 10a. The distance between the two teeth 13a facing each other through the center CA of the disc part 11a is 2r. Specifically, 2r is the distance from the inner surface of one tooth 13a to the inner surface of the other tooth 13a. In other words, 2r is the approximate diameter of the disk portion 11a. Other stators have the same shape and size as the stator 10a.

  FIG. 4 is a development view of the stator unit group SG. One end 31a and the other end 32a of the coil 30a are wired linearly around the outer periphery of these stator units. Similarly, the one end 31b and the other end 32b of the coil 30b, the one end 31c and the other end 32c of the coil 30c, and the one end 31d and the other end 32d of the coil 30d are also linearly wired on the outer periphery of the stator unit group SG. Has been.

  As shown in FIG. 4, in the present embodiment, the one end 31a is wired from the upper side of the coil 30a to the lower side of the stator unit group SG. That is, the one end portion 31a is wired from the stator 10a side to the lower side of the stator unit group SG. The other end 32a is wired from the lower side of the coil 30a to the lower side of the stator unit group SG. That is, the other end 32a is wired from the stator 20a side to the lower side of the stator unit group SG. Similarly, the one end 31b is from the upper side of the coil 30b, the other end 32b is from the lower side of the coil 30b, the one end 31c is from the upper side of the coil 30c, and the other end 32c is from the lower side of the coil 30c. Are wired from above the coil 30d, and the other end 32d is wired from below the coil 30d. In addition, even if these are upside down, the coil may be wired from the same stator side.

  The ends of these coils are wired so as to pass between the teeth of the stator unit. The end portions of these coils can be wired so as to partially overlap the inner sides of the teeth 23a to 23d protruding upward as in this embodiment. As shown in FIG. 4, the ends of these coils are wired in a straight line in a state where they are inclined at the same angle with respect to the axial direction. The end of the coil is connected to a terminal CN arranged on the lower side of the stator unit.

  Thus, in the motor M of the present embodiment, the coil is linearly wired on the outer periphery of the stator unit. For this reason, compared with the case where the coil is wired in the space inside the stator unit as in the prior art, wiring work is easier. Moreover, even if such a motor is miniaturized, coil wiring work is facilitated.

  Next, conditions for enabling wiring of the coil as described above will be described. FIG. 5 is an explanatory view of the angular difference in the circumferential direction of the stator unit and the stator. FIG. 5 is a development view of the stator unit group SG, and one end 31a and the like of the coil 30a are omitted.

  The angular difference in the circumferential direction between the stator units A and C that are not adjacent to each other, the angular difference in the circumferential direction between the stator units B and D, or more precisely, the angular difference in the circumferential direction between the A-phase stator unit and the B-phase stator unit. Let θ0.

  The angular difference in the circumferential direction of the stators 10a and 20a, the angular difference in the circumferential direction of the stators 10b and 20b, the angular difference in the circumferential direction of the stators 10c and 20c, and the angular difference in the circumferential direction of the stators 10d and 20d are defined as θ1. The circumferential angle difference between the stators 10a and 20a is, for example, a circumferential angle difference from the center of the tooth 13a to the center of the tooth 23a adjacent to the tooth 13a in the same direction as θ0.

  The angular difference in the circumferential direction of the stator units A and B and the angular difference in the circumferential direction of the stator units C and D are respectively θ2. When the number of teeth of each stator is P and n is an integer, the stator unit group SG of the motor M of this embodiment is designed to satisfy the following formula.

(Π / P) − (π / 6P) ≦ θ0 ≦ (π / P) + (π / 6P) (1)
(2π / P) − (π / 6P) ≦ θ1 ≦ (2π / P) + (π / 6P) (2)
((Θ1 / 4) + 2πn) − (θ1 / 6) ≦ θ2 ≦ ((θ1 / 4) + 2πn) + (θ1 / 6) (3)

  Note that these θ0, θ1, and θ2 mean angular differences in the same circumferential direction when, for example, one of the plurality of teeth 13a of the stator unit A is used as a reference. The units of θ0, θ1, and θ2 are radians.

  FIG. 6 is an explanatory diagram of the shape and size of the stator teeth. The tooth tip of the tooth 13a of the stator unit A, the tooth tip of the tooth 13b of the stator unit B adjacent to the tooth 13a, the tooth tip of the tooth 13c of the stator unit C adjacent to the tooth 13b, and adjacent to the tooth 13c Of the teeth 13d of the stator unit D to be rotated, the angle of the straight line connecting the two points with the sharpest angle with respect to the axial direction is θa. In other words, the angle with respect to the axial direction of the straight line connecting the two sharpest points among the straight lines connecting the tips of the first teeth of each stator unit is θa. In FIG. 6, the tooth tips of the adjacent stator units 13 a to 13 d facing the same direction are arranged so as to be aligned on the same straight line inclined at a predetermined angle with respect to the axial direction. Depending on the conditions of the equations (1), (2), and (3), they may not be on the same straight line.

  The angle of the straight line connecting each tooth tip of the adjacent teeth 13a and 23a of the stator unit A with respect to the axial direction is θb. Similarly, the angle of the straight line connecting the respective tooth tips of the adjacent teeth 13b and 23b of the stator unit B, the angle of the straight line connecting the respective tooth tips of the adjacent teeth 13c and 23c of the stator unit C, and the adjacent of the stator unit D The angle of the straight line connecting the respective tooth tips of the teeth 13d and 23d to be rotated is also θb.

  The distance between the disk parts 11a and 21a of the stator unit A, the distance between the disk parts 11b and 21b of the stator unit B, the distance between the disk parts 11c and 21c of the stator unit C, and the disk part 11d of the stator unit D , 21d are L1 respectively.

  Each of the teeth 13a to 13d and 23a to 23d has a height from the disk portion bottom surface of L2, a tooth tip width of L3, and a tooth root width of L4. Moreover, the thickness in the axial direction of each of the disk parts 11a to 11d and 21a to 21d is t. In this case, the motor M of the present embodiment satisfies the following expression.

L = ((2L2-L1) ² + (θ1r−L3) ² ) ^1/2 (4)
Lsin (θb−θa) ≧ Φ (5)
α = tan ⁻¹ ((L4−L3) / 2L2) (6)
α ≦ θa (7)
θa = tan ⁻¹ (rθ2 / (L1 + 2t)) (8)
θb = tan ⁻¹ ((rθ1−L3) / (2L2−L1)) (9)

  When satisfy | filling the said Formula, as shown in FIG. 4, the end of a coil can be wired linearly so that it may pass between the adjacent teeth in each stator unit.

Next, the drawing position of each coil will be described. When the number of ends of each of the coils 30a to 30d is i (in the embodiment, the number of ends of the coil 30a is two), and the position of the midpoint between the adjacent teeth 13a and 23a is the origin, An angle jθ1 in the circumferential direction from the origin to the drawing position of the coil 30a may satisfy the following expression.
((4 * i / P) −1) π ≦ jθi ≦ (1- (4 * i / P)) π (10)
Here, j is an arbitrary even number that satisfies Expression (10).

An angle kθ1 in the circumferential direction from the same origin to the coil 30b drawing position may satisfy the following equation.
(((4 * i + 4) / P) −1) π ≦ kθi ≦ (1-((4 * i + 4) / P)) π (11)
Here, k is an arbitrary even number that satisfies Expression (11) and does not match j + n + 1.

  The angle in the circumferential direction from the same origin to the drawing position of the coil 30c may be a position where lθ1 using any even number l that does not match j + n + 3 but does not match k + n + 1.

  The circumferential angle from the same origin to the coil 30d drawing position as described above may be a position where mθ1 using any even number m that does not match j + n + 5, does not match k + n + 3, and does not match l + n + 1.

  When the above formulas (10) to (11) are satisfied, the end of the coil 30a and the end of the coil 30b are adjacent to each other with or between the pair of teeth protruding in opposite directions. Can be pulled out at a position where no coil exists. Similarly, the coil 30c can be pulled out at a position where the end of the coil 30d is adjacent to the end of the coil 30d, or a position where no other coil exists between them, and the coil 30c can be pulled out at a position where the ends of all the coils do not overlap. Can do. For example, as shown in FIG. 4, in M of the present embodiment, one end 31a of the coil 30a and one end 31b of the coil 30b are a pair of teeth 13b and 23b, a pair of teeth 13c and 23c, and a pair of teeth 13d. , 23d. Similarly, the other end portions 32a and 32b are adjacent, the one end portions 31c and 31d are adjacent, and the other end portions 32c and 32d are also adjacent.

  For example, when the stator units A and B correspond to A-phase stator units and the stator units C and D correspond to B-phase stator units, the coils 30a and 30b can be connected and the coils 30c and 30d can be connected. Conceivable. As described above, when the drawing positions of the ends of different coils are adjacent to each other or there is no other coil between them, the operation of connecting both coils is facilitated. This facilitates coil wiring work. Further, since the coils do not overlap each other, contact between the coils is also prevented.

  Next, the case where there are six stator units will be described. A case is assumed in which first, second, third, fourth, fifth, and sixth stator units are arranged in order in one axial direction.

  The angular difference in the circumferential direction of the first and fourth stator units, the angular difference in the circumferential direction of the second and fifth stator units, the angular difference in the circumferential direction of the third and sixth stator units, more precisely, the A-phase stator The angle difference in the circumferential direction between the unit and the B-phase stator unit is defined as θ0. In other words, the angle difference in the circumferential direction between the first, second, and third stator units and the fourth, fifth, and sixth stator units is θ0. A circumferential angle difference between the first and second stators of each stator unit is defined as θ1. The angular difference in the circumferential direction between the first and third stator units and the angular difference in the circumferential direction between the fourth and sixth stator units are θ2. A circumferential angle difference between the first and second stator units and a circumferential angle difference between the fourth and fifth stator units are defined as θ3. Let P be the number of teeth of each stator and n be an integer.

In this case, the following expressions are satisfied in addition to the expressions (1) to (3) described above.
θ3 = θ2 / (6 / 2-1) (12)
Thereby, a coil can be wired linearly on the outer periphery of a stator unit.

When the number of stator units is S (6 or more), the following equation may be satisfied instead of the above equation (12).
θ3 = θ2 / (S / 2-1) (13)
In this case, the angular difference in the circumferential direction of the first and S / 2 stator units, the angular difference in the circumferential direction of the (S + 1) / 2 and S stator units are θ2, and θ3 is the angular difference between the stator units. Become.

  In the case where only two stator units are provided, the above formulas (2) and (3) may be satisfied.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and modifications and changes can be made within the scope of the gist of the present invention described in the claims. Is possible.

M Motor A to D Stator unit 10a to 10d, 20a to 20d Stator 13a to 13d, 23a to 23d Teeth 11a to 11d, 21a to 21d Disc part 30a to 30d Coil 31a to 31d One end part 32a to 32d The other end part 40 Rotor

Claims (7)

A plurality of stator units that are arranged concentrically with a predetermined angular difference in the circumferential direction; and
A plurality of coils for exciting each of the plurality of stator units;
An outer rotor disposed on the outer periphery of the plurality of stator units,
Each of the plurality of stator units includes first and second stators having a predetermined angular difference in the circumferential direction,
The first stator includes a first disk portion, a plurality of first teeth provided at equal intervals on the first disk portion and protruding toward the second stator side,
The second stator includes a plurality of second teeth that are provided in a second disc portion and the second disc portion and that protrude to the first stator side with the same interval, size, and number of the first teeth. Including
The plurality of first and second teeth are alternately arranged in the outer circumferential direction of the stator unit,
At least one end portion of the plurality of coils is linearly drawn to the outer peripheral portion of the plurality of stator units, and passes between the first and second teeth adjacent to each other of each stator unit. Rotor type motor.   The outer rotor type motor according to claim 1, wherein one end portions of each coil are adjacent to each other with the first and second teeth interposed therebetween. The plurality of stator units include first and second stator units arranged in order in one axial direction,
Each number of the first and second teeth of each stator unit is P;
The angular difference in the circumferential direction between the first and second stators of each stator unit is θ1.
The circumferential angle difference between the first and second stator units is θ2.
When n is an integer, (2π / P) − (π / 6P) ≦ θ1 ≦ (2π / P) + (π / 6P)
((Θ1 / 4) + 2πn) − (θ1 / 6) ≦ θ2 ≦ ((θ1 / 4) + 2πn) + (θ1 / 6)
The outer rotor type motor according to claim 1 or 2, wherein The plurality of stator units include first, second, third, and fourth stator units arranged in order in one axial direction,
Each number of the first and second teeth of each stator unit is P;
The circumferential angle difference between the first and second stator units and the third and fourth stator units is θ0,
The angular difference in the circumferential direction between the first and second stators of each stator unit is θ1.
The angular difference in the circumferential direction between the first and second stator units and the angular difference in the circumferential direction between the third and fourth stator units are θ2.
When n is an integer, (π / P) − (π / 6P) ≦ θ0 ≦ (π / P) + (π / 6P)
(2π / P) − (π / 6P) ≦ θ1 ≦ (2π / P) + (π / 6P)
((Θ1 / 4) + 2πn) − (θ1 / 6) ≦ θ2 ≦ ((θ1 / 4) + 2πn) + (θ1 / 6)
The outer rotor type motor according to claim 1 or 2, wherein The plurality of stator units include first, second, third, fourth, fifth, and sixth stator units arranged in order in one axial direction,
Each number of the first and second teeth of each stator unit is P;
The angular difference in the circumferential direction between the first, second and third stator units and the fourth, fifth and sixth stator units is θ0,
The circumferential angle difference between the first and second stators is θ1,
The angular difference in the circumferential direction between the first and third stator units and the angular difference in the circumferential direction between the fourth and sixth stator units are θ2,
The angular difference in the circumferential direction between the first and second stator units, and the angular difference in the circumferential direction between the fourth and fifth stator units are θ3,
When n is an integer, (π / P) − (π / 6P) ≦ θ0 ≦ (π / P) + (π / 6P)
(2π / P) − (π / 6P) ≦ θ1 ≦ (2π / P) + (π / 6P)
((Θ1 / 4) + 2πn) − (θ1 / 6) ≦ θ2 ≦ ((θ1 / 4) + 2πn) + (θ1 / 6)
θ3 = θ2 / (6 / 2-1)
The outer rotor type motor according to claim 1 or 2, wherein The outer diameter of the coil is Φ,
Of the straight lines connecting the tips of the first teeth of each stator unit, the angle of the straight line connecting the two points that are the acute angles with respect to the axial direction is θa,
The angle of a straight line connecting the tips of the first and second teeth adjacent to each stator unit with respect to the axial direction is θb,
The distance between the first and second stators of each stator unit is L1,
Each of the first and second teeth has a height from the first or second disc portion of L2, a tooth tip width of L3, and a tooth root width of L4.
The distance between the two first teeth facing each other through the center of the first stator is 2r,
If the plate pressure in the axial direction of the first stator is t,
L = ((2L2-L1) ² + (θ1r−L3) ² ) ^1/2
Lsin (θb−θa) ≧ Φ
α = tan ⁻¹ ((L4−L3) / 2L2)
α ≦ θa
θa = tan ⁻¹ (rθ2 / (L1 + 2t))
θb = tan ⁻¹ ((rθ1-L3) / (2L2-L1))
The outer rotor type motor according to claim 3, wherein: A plurality of stator units arranged concentrically with a predetermined angular difference in the circumferential direction;
A plurality of coils for exciting each of the plurality of stator units;
An outer rotor disposed on the outer periphery of the plurality of stator units,
Each of the plurality of stator units includes first and second stators having a predetermined angular difference in the circumferential direction,
The first stator includes a first disk portion, a plurality of first teeth provided at equal intervals on the first disk portion and protruding toward the second stator side,
The second stator includes a plurality of second teeth that are provided in a second disc portion and the second disc portion and that protrude to the first stator side with the same interval, size, and number of the first teeth. Including
The plurality of stator units include first and second stator units arranged in order in one axial direction,
Each number of the first and second teeth of each stator unit is P;
The angular difference in the circumferential direction between the first and second stators of each stator unit is θ1.
The circumferential angle difference between the first and second stator units is θ2.
Let n be an integer,
The outer diameter of the coil is Φ,
Of the straight lines connecting the tips of the first teeth of each stator unit, the angle of the straight line connecting the two points that are the acute angles with respect to the axial direction is θa,
The angle of a straight line connecting the tips of the first and second teeth adjacent to each stator unit with respect to the axial direction is θb,
The distance between the first and second stators of each stator unit is L1,
Each of the first and second teeth has a height from the first or second disc portion of L2, a tooth tip width of L3, and a tooth root width of L4.
The distance between the two first teeth facing each other through the center of the first stator is 2r,
If the plate pressure in the axial direction of the first stator is t,
(2π / P) − (π / 6P) ≦ θ1 ≦ (2π / P) + (π / 6P)
((Θ1 / 4) + 2πn) − (θ1 / 6) ≦ θ2 ≦ ((θ1 / 4) + 2πn) + (θ1 / 6)
L = ((2L2-L1) ² + (θ1r−L3) ² ) ^1/2
Lsin (θb−θa) ≧ Φ
α = tan ⁻¹ ((L4−L3) / 2L2)
α ≦ θa
θa = tan ⁻¹ (rθ2 / (L1 + 2t))
θb = tan ⁻¹ ((rθ1-L3) / (2L2-L1))
Satisfying the outer rotor type motor.

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