JP2009148020A - Permanent magnet type alternator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-phase permanent magnet type alternator capable of improving power generation characteristics by fining the wires of a stator coil 9 while the stator coil 9 is Δ-connected. <P>SOLUTION: The three-phase stator coil 9 having Δ connection groups I, II connected in parallel is formed in such a way that, of three-phase coils, U-phase coils are wound in parallel while being separated into coils U1, U2, U3 and coils U4, U5, U6, V-phase coils and W-phase coils are wound in the same way with every one slot shifted, and the coils U1-U3, V1-V3 and W1-W3 are subjected to Δ connection to form the first Δ connection group I, the coils U4-U6, V4-V6 and W4-W6 are subjected to Δ connection to form the second Δ connection group II; and corresponding connection portions of the Δ connection groups I, II are each connected to the resulted body having the first and second Δ connection groups by wirings 10, 11, 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention belongs to the technical field of a permanent magnet type AC generator configured using a permanent magnet mounted on a small vehicle such as a motorcycle or a buggy.

In general, this type of permanent magnet type AC generator includes a permanent magnet such as a ferrite magnet provided on the inner peripheral surface of a yoke having a bottomed cylindrical shape with a predetermined interval in the circumferential direction. ) And a stator core (stator) provided concentrically with the outer rotor and provided with a teeth portion (a salient pole) around which a stator coil is wound so as to project radially, the outer rotor is rotated based on engine driving. Thus, an electromotive force is induced in the stator coil to generate power.
In such a permanent magnet type AC generator, when the stator coil is Y-connected, there is a problem in that the amount of self-heating is increased, and a Δ-connected one is proposed (for example, Patent Document 1). reference).
Japanese Patent Application Laid-Open No. 2004-166381

  However, in the above-mentioned conventional one, in which the stator coil is Δ-connected, since one phase is connected in series, the coil length becomes long, which causes a problem that the energization resistance becomes large and the efficiency is low, which solves this problem. Therefore, an attempt is made to reduce the resistance by increasing the coil diameter. However, if the coil diameter is increased, the number of turns of the coil decreases, and the power generation characteristics are affected, such as improvement of surplus output and required output, etc., and the coil becomes hard and difficult to wind. There are problems to be solved by the present invention.

The present invention was created in view of the above-described circumstances in order to solve these problems. The invention of claim 1 has a cylindrical shape and is alternately poled on the inner peripheral surface. A magnet type comprising an outer rotor to which a permanent magnet is attached in a circumferential direction, and a stator core in which a stator coil is wound around a tooth that is provided in the outer rotor and protrudes at an angle in the circumferential direction. In this AC generator, when the stator coils are three-phase and Δ-connected, the stator coils are sequentially wound around two-phase teeth, and the number N of teeth is N = 3 × n However, n is defined by a natural number of 2 or more, and when the divisor X of n is a number that includes 1 but does not include n, the stator core has a stator coil wound around the teeth. Number it Re to become Δ connection group X or by the shall be n ÷ X number forming a permanent magnet type AC generator, wherein a Δ connection group to be those formed are connected in parallel.
According to a second aspect of the present invention, there is provided an outer rotor having a cylindrical shape and permanent magnets alternately having different polarities on the inner peripheral surface, the inner rotor being mounted in the circumferential direction, and the outer rotor having an angle in the circumferential direction. In a magnet type AC generator configured using a stator core having a stator coil wound around a projecting tooth, when the stator coil is three-phase and Δ-connected, the stator coil is The number of teeth N is N = 3 × n, where n is defined by a natural number of 2 or more, and a divisor X of n includes 1 but n is included When the number of the stator coils is not set, the stator core is formed with n / X Δ connection groups each having X stator coils wound around the teeth, and these Δ connection groups are formed. Connected in parallel A permanent magnet type AC generator according to claim.

  According to the first or second aspect of the present invention, the stator coil is Δ-connected to form a three-phase permanent magnet AC generator by Δ-connection, and a plurality of Δ-connection groups are formed. As a result, the current induced by the rotation of the rotor core flows through a plurality of Δ connection groups at the same time, so that the resistance of the stator coil is reduced, and thereby the stator coil can be thinned. Thus, the coil can be easily wound and the number of turns of the coil can be increased, so that the power generation characteristics can be improved. Further, since it is a parallel winding, it can be wound by the double flyer method and the winding work is simplified.

  Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a permanent magnet type three-phase AC generator. The AC generator 1 includes a bottomed cylindrical outer rotor 2 and a concentric outer rotor 2 on the inner periphery of the outer rotor 2. In order to form the outer rotor 2, the bottom 4a of the bottomed cylindrical yoke 4 that is open at one end in the axial direction is positioned at the center of the cylinder 4 And a boss portion 4b that is connected to an output shaft on the engine side (not shown), and the outer rotor 4 is driven to rotate by the driving rotation on the engine side. The coil is electromagnetically induced to generate power.

  A plurality of permanent magnets 5 are assembled to the inner peripheral surface portion 4c of the yoke 4 at predetermined intervals in the circumferential direction so that a plurality of permanent magnets 5 are alternately different poles (in this embodiment, the number is 12 poles). Therefore, the inner peripheral surface portion 4c is processed by, for example, cutting so that the inner diameter of the inner peripheral surface opening side half portion is larger than the inner diameter of the bottom surface side half portion. A magnet mounting portion 4d is formed on the opening side. A permanent magnet 5 is attached to the magnet attachment portion 4d via a magnet case 6, and the inner peripheral surface of the attached permanent magnet 5 is covered with a magnet cover 7.

  On the other hand, the stator core 3 is formed with a core portion 3a having a diameter larger than the outer diameter of the boss portion 4b in a state of being concentric with the yoke 4, and has a predetermined circumferential direction angle from the core portion 3a. The teeth 3b protrude, and the stator coil 9 is wound around the teeth 3b. The outer peripheral surface of the teeth 3b faces the magnet cover 7 with a gap (gap) therebetween.

The stator core 3 has a teeth portion for two phases between the stator coils 9 (in this embodiment, the stator coils 9 are wound around three teeth portions 3b for one phase as will be described later). Three teeth 3b each having 3b are sequentially wound into three-phase and Δ-connected. In this case, the number N of teeth is N = 3 × n where n Is defined by a natural number of 2 or more,
When the divisor X of n is a number including 1 but not including n,
The stator core is formed with n ÷ X Δ connection groups each having X stator coils wound around the teeth.
When the divisor X of n includes 1 but does not include n,
These formed Δ connection groups are connected in parallel.

This will be described more specifically below. The stator coil winding method of the first embodiment shown in FIG. 4 is that in this case, there are 18 teeth portions 3b (n = 6, N = 3 × 6). There is a certain 18-slot system, and when 3 (= X), which is a divisor of 6 (= n), is selected for this, two stator coils have three stator coils (= n ÷ X = 6). A case in which the Δ connection group of / 3) is connected in parallel will be described. Now, when the phases wound around the tooth portion 3b are three phases of U, V, and W, the coils of these phases interleave the two-phase teeth portion 3b (between the two-phase teeth). Are wound sequentially around the teeth portion (three consecutive teeth portions 3b) 3b for one phase, and the U-phase coils U1, U2, U3, Similarly, U4, U5, and U6 are addressed, and similarly, the V-phase coil is wound in order of V1 to V6, and the W-phase coil is W1 to W6. In this case, the U-phase coil is divided into a coil U1, U2, U3 and a coil U4, U5, U6 separated from the start of winding (S) to the end of winding (E). In a state where the coils are wound in the same manner and shifted one slot at a time, the V-phase coil becomes the coils V1, V2, and V3, and the V-phase coil becomes the coils V4, V5, and V6. The coils W1, W2, and W3 and the coils W4, W5, and W6 are wound in parallel.
The coils U1 to U3, coils V1 to V3, and coils W1 to W3 are Δ-connected to form the first Δ connection group I, while the coils U4 to U6, coils V4 to V6, and coils W4 to W6 The second Δ connection group II is formed by Δ connection, and the corresponding connection parts UWI and UWII, UVI and UVII, VWI and VWII of the respective Δ connection groups I and II are wired 10 to each other. , 11, and 12, and external connection terminals 10 a, 11 a, and 12 a are provided from the connection wires 10, 11, and 12 to form a three-phase stator coil 9 in which Δ connection groups I and II are connected in parallel. ing.

  In the embodiment of the present invention configured as described above, the stator coil 9 constituting the three-phase permanent magnet type AC generator has a delta connection to improve the efficiency. The coil 9 is formed in such a manner that the first and second connection groups I and II that are Δ-connected are arranged in parallel with each other in a line-symmetric state, and corresponding ones of these connection parts are further connected and connected in parallel. It will be a thing. As a result, the current induced in the stator coil 9 due to the rotation of the outer rotor 2 simultaneously flows through the first and second connection groups I and II connected in parallel, and the resistance of the stator coil 9 decreases. .

  Thus, in the embodiment in which the present invention is implemented, the stator coil 9 is a Δ-connected one connected in parallel, and the resistance of the stator coil 9 is reduced, thereby making the stator coil 9 thinner. Thus, the coil can be easily wound and the number of turns of the coil can be increased, thereby improving the power generation characteristics. Since the coils of each phase are line-symmetrically wound in parallel, they can be wound by the double flyer method, and the winding work is simplified.

Further, in FIG. 5, the winding method of the second embodiment is adopted. In other words, this is an 18-slot system having 18 teeth 3b (n = 6 and N = 3 × 6), and this has 6 (= n) When a divisor of 3 (= X) is selected, two (= n ÷ X = 6/3) Δ connection groups with three stator coils are connected in parallel. And in this thing, like the said 1st embodiment, when it is set as the three phases of U, V, and W, the coil of each phase is in a state where the teeth portion 3b is displaced one by one. Two teeth portions 3b are placed (to jump two teeth in between) and sequentially wound around the teeth portions 3b. That is, for each phase coil, the U phase coil is similarly addressed as U1 to U6, the V phase coil is addressed as V1 to V6, and the W phase coil is addressed as W1 to W6. These are wound sequentially with the tooth portion 3b of 2b interposed therebetween. Even in this case, the U-phase coil was separated into a coil U1, U2, U3 and a coil U4, U5, U6 from the start of winding (S) to the end of winding (E). When wound in parallel and shifted by one slot in the same manner, the V-phase coils are the coils V1, V2, and V3, and the V-phase coils are the coils V4, V5, and V6. The coils W1, W2, and W3 and the coils W4, W5, and W6 are wound in parallel.
The coils U1 to U3, coils V1 to V3, and coils W1 to W3 are Δ-connected to form the first Δ connection group I, while the coils U4 to U6, coils V4 to V6, and coils W4 to W6 The second Δ connection group II is formed by Δ connection, and the corresponding connection parts UWI and UWII, UVI and UVII, VWI and VWII of the respective Δ connection groups I and II are wired 10 to each other. , 11, and 12, and external connection terminals 10 a, 11 a, and 12 a are provided from the connection wires 10, 11, and 12 to form a three-phase stator coil 9 in which Δ connection groups I and II are connected in parallel. Needless to say, the present invention can be implemented even with such a winding method.

  The present invention is not limited to the above embodiments, and can be freely increased or decreased as long as the number of teeth is defined by the above formula. Needless to say, the number of permanent magnets can be increased or decreased as long as the function as a three-phase AC generator is not impaired.

Now, the total number N of the teeth is N = 3 × n, where n is defined by a natural number of 2 or more,
When the divisor X of n includes 1 but does not include n, the stator core includes n ÷ X groups of Δ connections in which the number of stator coils wound around the teeth is X. The formation will be described in more detail with reference to the table shown in FIG.

  In the table, when n = 2, the total number N of teeth is 6, the divisor not including 2 of n = 2 is 1, and the Δ connection group is 2 Δ connection groups formed by one stator coil. Individual pieces will be formed. FIG. 7A shows the wiring. In this way, the Δ connection group connected in parallel is defined. When n = 6 described above, the defined divisors are 1, 2, and 3. The wirings for these are shown in FIGS. 7B, 7C and 7D. Further, in the above table, the total number of teeth, divisor (= number of coils in the Δ connection group), number of Δ connection groups (= n / X) when n = 3, 4, 8, and 12 are defined. Is shown.

It is a front view of a three-phase permanent magnet type AC generator. It is a cross-sectional side view of a three-phase permanent magnet AC generator. FIG. 6 is a wiring circuit diagram showing a connection state between Δ connection groups I and II formed when n = 6 and X = 3. It is a front view of the stator core which shows the state which wound the stator coil of the U phase in 1st embodiment. It is a front view of the stator core which shows the state which wound the stator coil of the U phase in 2nd embodiment. It is a table | surface figure which shows the number of N, X, and (DELTA) connection group when changing n. (A) is a wiring circuit diagram when n = 2 and X = 1, and (B), (C) and (D) are wiring circuit diagrams when n = 6 and X = 1, 2, and 3, respectively. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC generator 2 Outer rotor 3 Stator core 3b Teeth part 9 Stator coil I 1st (DELTA) connection group II 2nd (DELTA) connection group

Claims (2)

A stator coil that is cylindrical and has an outer rotor in which permanent magnets alternately having different polarities on the inner peripheral surface are attached in the circumferential direction, and teeth that are built in the outer rotor and project at an angle in the circumferential direction. In a magnet type AC generator configured using a stator core wound with
In assuming that the stator coil is three-phase and Δ-connected,
The stator coil is wound around two-phase teeth sequentially.
The number N of teeth is N = 3 × n where n is a natural number of 2 or more,
When the divisor X of n is a number including 1 but not including n,
The stator core is formed with n ÷ X Δ connection groups each having X stator coils wound around the teeth.
A permanent magnet type AC generator in which these formed Δ connection groups are connected in parallel. A stator coil that is cylindrical and has an outer rotor in which permanent magnets alternately having different polarities on the inner peripheral surface are attached in the circumferential direction, and teeth that are built in the outer rotor and project at an angle in the circumferential direction. In a magnet type AC generator configured using a stator core wound with
In assuming that the stator coil is three-phase and Δ-connected,
The stator coil is wound around two teeth in sequence,
The number N of teeth is N = 3 × n where n is a natural number of 2 or more,
When the divisor X of n is a number including 1 but not including n,
The stator core is formed with n ÷ X Δ connection groups each having X stator coils wound around the teeth.
A permanent magnet type AC generator in which these formed Δ connection groups are connected in parallel.

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