JP3289596B2 - Radial gap type motor with core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a configuration of a radial gap type motor with a core as a rotary drive source used for, for example, a magnetic disk or an optical disk drive.

[0002]

2. Description of the Related Art In recent years, with the miniaturization, thinning, and power saving of driving devices for magnetic disks, optical disks, and the like, radial gap type motors with a core, which is a rotary driving source, have various structures, performances, and assembling methods. Improvements have been made. Figure 7 -Figure
10 shows a conventional radial gap type motor with a three-phase core, FIG. 7 is a plan view, FIG. 8 is a plan view showing a state before molding of a stator part, and FIG. 9 is a state before molding of a stator part and before coil winding. FIG. 10 is a side view showing a state before molding of the stator portion and before coil winding.

[0003] In the drawing, reference numeral 1 denotes a rotor portion having a rotor magnet 2 attached to a plurality of magnetic poles on its outer periphery;
Seven sets of stator components, each of which is a set of three (for the number of phases) of the phase teeth 4a, 4b, and 4c, are formed by laminating a number of soft magnetic silicon steel plates 5 and forming a thin portion 6 Are formed into a circular shape and are arranged on the outer periphery of the rotor portion 1 to form the stator portion 7. 8a, 8b, 8c
Is a coil wound around each phase teeth 4a, 4b, 4c with the same number of turns, and connected in series with each set.

FIGS. 11 , 12 and 13 are enlarged plan views showing the flow of magnetic flux inside one stator component 3, and FIG. 14 is an enlarged side view of the stator component 3. In the figure, 9ac is a magnetic flux flowing between the A-phase teeth 4a and the C-phase teeth 4b, 9ab is a magnetic flux flowing between the A-phase teeth 4a and the B-phase teeth 4b, and 9cb is a magnetic flux flowing between the C-phase teeth 4c and the B-phase teeth 4b. , silicon steel plates stacked is 5, _{l 1} is the teeth 4a, 4b, 4c length _{of, l} 2,
l ₃ is the teeth 4a, 4b, spacing length between _{4c, w} 1,
w _{2, w 3} is the teeth 4a, 4b, 4c of the width, t is the thickness of the teeth 4a, 4b, 4c.

As shown in the drawing, magnetic fluxes 9ac, 9ab, 9cb and magnetic fluxes in the opposite directions flow through the phase teeth 4a, 4b, 4c of each stator component 3 according to the position of the rotor magnet 2. Coil 8a corresponding to
When a current flows through 8b and 8c, a driving force is generated on the rotor magnet 2 by the interaction between the magnetic flux and the current, and the rotor unit 1 rotates.

The driving force generated in the rotor unit 1 is proportional to the magnetic flux, the current and the number of turns of the coil, and the strength of the magnetic flux is inversely proportional to the magnetic resistance of the magnetic flux path (hereinafter referred to as magnetic path). That is, Rm is the magnetic resistance of each magnetic path core, L is the total length of each magnetic path core, S is the cross-sectional area of each magnetic path core, μ is the magnetic permeability of each magnetic path core, w is the width of each magnetic path core, If t is the thickness of each magnetic path core, Rm∞L / (S × μ) = L / (w × t × μ) (1)

[0007] In the case of the conventional example shown in FIGS. 7-14, the teeth 4a, 4b, 4c of the _width, their cross-sectional area S because it is _{w 1 =} w 2 ₌ w ₃ are 11, 12 , 13 throat flux 9ac, 9ab, is equal in the magnetic path for 9cb, the magnetic path length L relative to the magnetic flux 9ac of FIG. 11, L
_{= 2l 1 + l 2 + l} 3, for the magnetic flux 9ab in FIG _{12 L = 2l 1 + l 3} , for the magnetic flux 9cb in FIG 13, L
= 2l ₁ + l ₂ . For this reason 11,
In each case of FIGS. 12 and 13 , the magnetic resistance Rm of each magnetic path core is different, and the driving force changes each time, causing torque ripple. Also, since the stator component 3 of the adjacent set is connected to the thin portion 6, the magnetic resistance of this portion is large, and the influence of the magnetic flux from the adjacent set can be ignored.

[0008]

SUMMARY OF THE INVENTION As described above, the conventional 3
Since the radial gap type motor with the phase core is configured as described above, there is a problem that torque ripple is generated because the driving force changes according to the rotational position of the rotor unit 1 and rotation fluctuation occurs.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a radial gap motor with a polyphase core having no change in driving force due to a rotational position of a rotor and having a small rotational fluctuation. It is an object.

[0010]

According to the first aspect of the present invention ,
In a three- phase radial gap motor with a core,
The number of windings on each set of teeth of one phase of the phase coil is different from the number of windings on each set of teeth of the other two phases .

[0011] invention 請 Motomeko 2 wherein, in the radial gap type motor with three-phase core, the magnetic resistance of each set tooth one phase of the three-phase coil is wound, each of the other two phases It is different from the magnetic resistance of the set teeth .

[0012] 請 Motomeko 3 the described invention, the radial gap type motor with three-phase core, the width of each set tooth one phase of the three-phase coil is wound, each set of the other two phases It is different from the width of the teeth .

[0013]

DETAILED DESCRIPTION OF THE INVENTION The implementation of the first embodiment. An embodiment of the present invention will be described below with reference to the drawings.
1 to 5 show a first embodiment of the present invention. FIG. 1 is a plan view, and FIGS. 2, 3 and 4 are enlarged plan views showing the flow of magnetic flux inside one stator constituting section 3. 5 is an enlarged side view of the stator component 3.

In FIG. 1, reference numeral 1 denotes a rotor unit, 2 denotes a rotor magnet mounted on the outer periphery of the rotor unit 1, and a plurality of rotor magnets magnetized to a plurality of magnetic poles.
Reference numerals 4b and 4c denote teeth of each phase constituting the stator component 3 of each set, and several sheets 5 are stacked to form the stator component 3
6 is a thin portion connecting the respective stator components 3, and 7 is a 7-piece stator component 3 which is formed by bending the thin portion 6 into a circular shape and arranging it on the outer periphery of the rotor portion 1. The above is the same as the conventional example shown in FIG. The coils 10a, 10b, and 10c are wound around the phase teeth 4a, 4b, and 4c, respectively, and are connected in series to each other. The coils 8 wound around the B-phase teeth 4b of each phase.
The number of turns of b is smaller than the number of turns of the other A and B phase coils 8a and 8c.

[0015] In FIGS. 2 5, 11ac magnetic flux flowing between the A-phase teeth 4a and C-phase tooth 4 c, 11ab
Is a magnetic flux flowing between the A-phase teeth 4a and the B-phase teeth 4b, 11cb is a magnetic flux flowing between the C-phase teeth 4c and the B-phase teeth 4b, 5 is a laminated silicon steel plate, and ₁₁ is a tooth of each of the teeth 4a, 4b, 4c. The length, l ₂ , l ₃ are the lengths of the intervals between the teeth 4a, 4b, 4c, w ₁ , w ₂ , w ₃ are the widths of the teeth 4a, 4b, 4c, and t is the teeth 4a, 4
b, 4c.

As shown in the figure, the magnetic fluxes 11ac, 11ab, 11cb and the magnetic fluxes in the opposite directions flow through the phase teeth 4a, 4b, 4c of each stator component 3 in accordance with the position of the rotor magnet 2. When a current is applied to the coils 10a, 10b, 10c corresponding to the above at an appropriate timing, a driving force is generated on the rotor magnet 2 due to the interaction between the magnetic flux and the current, and the rotor unit 1 rotates.

The driving force generated in the rotor section 1 is proportional to the magnetic flux, the current and the number of turns of the coil as shown in the above equation (1), and the strength of the magnetic flux is inversely proportional to the magnetic resistance Rm of the magnetic path. In this embodiment, each of the teeth 4a, 4b, 4c of the _width, their cross-sectional area S because it is _{w 1 =} w 2 ₌ w ₃ is
Which of the magnetic fluxes 11ac, 11ab, 11 shown in FIGS.
The magnetic path length L is equal to the magnetic path for cb, but the magnetic path length L is L = 2l ₁ + l ₂ + l ₃ for the magnetic flux 11ac of FIG.
For flux _{11ab L = 2l 1 + l 3} , for the magnetic flux 11cb in Figure _{4, L = 2l 1 + l} 2 becomes, _{l 2}
= So _{l 3,} 3, flux 11ab in Fig. 4, the magnetic resistance Rm is equal for 11cb, only magnetoresistance Rm is greater for the magnetic flux 10ac of FIG.

In order to compensate for this, in this embodiment, the magnetic flux 11ac does not become a magnetic path, but the magnetic flux 11ab, 1ab.
The number of turns of the coil 10b wound around the B-phase teeth 4b, which is a magnetic path of 1cb, is made smaller than that of the coils 10a and 10c of the other phases so that the driving force does not change with the rotational position of the rotor unit 1. ing. Therefore, the torque ripple is reduced, and the rotation of the rotor can be stabilized .

[0019] The implementation form 2. FIG. 6 is an enlarged plan view of a stator component 3 according to Embodiment 4 of the present invention. In FIG, 3 is a stator component, 4a, 4b, 4c in each phase teeth, the width _{w 2} of the other teeth 9a of B-phase teeth 4b, 9c width _w 1 of, _{w 3}
Has been made smaller than. With this configuration, the magnetic resistance Rm of the magnetic path of the magnetic flux 11ac and the magnetic flux 11a
The magnetic resistances Rm of the magnetic paths b and 11cb can be made equal. Therefore, the torque ripple is reduced, and the rotation of the rotor unit 1 can be stabilized .

[0020]

Invention 請 Motomeko 1, wherein, according to the present invention, as described above, the number of turns to each set teeth of one phase of the three-phase coils, and the number of turns of the each set tooth of the other two phases Since the difference is made, it is possible to correct the variation of the driving force caused by the imbalance of the magnetic resistance of the magnetic path with respect to each magnetic flux, and to obtain a stable three-phase radial gap type motor with a small torque ripple and a stable rotation. There is .

[0021] As 請 Motomeko 2 the described invention has been described above, the magnetic resistance of each set tooth one phase of the three-phase coil is wound, and the magnetic resistance of each set tooth of the other two phases Since the difference is made, it is possible to correct the variation of the driving force caused by the imbalance of the length of the magnetic path with respect to each magnetic flux, and it is possible to obtain a stable three-phase radial gap motor with a core having little torque ripple. There is .

[0022] As the invention of 請 Motomeko third aspect described above, the width of each set tooth one phase of the three-phase coil is wound, made different to the width of each set tooth of the other two phases Therefore, it is possible to correct the variation in the driving force caused by the imbalance in the length of the magnetic path with respect to each magnetic flux, and it is possible to obtain a three-phase radial gap motor with a stable rotation and a small torque ripple. .

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is an enlarged plan view showing a flow of a magnetic flux inside a stator component according to the first embodiment.

FIG. 3 is an enlarged plan view showing a flow of a magnetic flux inside a stator component according to the first embodiment.

FIG. 4 is an enlarged plan view showing a flow of a magnetic flux inside a stator component according to the first embodiment.

FIG. 5 is an enlarged side view of a stator component according to the first embodiment.

FIG. 6 is an enlarged plan view of a stator component according to the second embodiment .

FIG. 7 is a plan view of the radial gap type motor with a three-phase core of come follow.

FIG. 8 is a plan view showing a state before molding of a stator portion in a radial gap motor with a three-phase core.

FIG. 9 is a plan view showing a state before molding of a stator portion and before coil winding in a radial gap motor with a three-phase core.

FIG. 10 is a side view showing a state before molding of a stator portion and before coil winding in a radial gap type motor with a three-phase core.

FIG. 11 is an enlarged plan view showing the flow of magnetic flux inside a stator component in a conventional radial gap motor with a three-phase core.

FIG. 12 is an enlarged plan view showing the flow of magnetic flux inside a stator component in a conventional radial gap motor with a three-phase core.

FIG. 13 is an enlarged plan view showing the flow of magnetic flux inside a stator constituting part in a conventional radial gap motor with a three-phase core.

FIG. 14 is an enlarged side view of a stator component in a conventional radial gap motor with a three-phase core.

[Explanation of symbols]

1 rotor part, 2 rotor magnet, 3 stator constituent part, 4a, 4b, 4c teeth of each phase,
5 Silicon steel plate, 6 Thin section, 7 Stator section, 10a, 10b, 10c Each phase coil.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-19196 (JP, A) JP-A-3-173328 (JP, A) JP-A-6-113493 (JP, A) JP-A-8-196 47185 (JP, A) JP-A-9-19123 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 3/28 H02K 1/14 H02K 1/16

Claims (3)

(57) [Claims] 1. A and the outer peripheral surface the rotor part which is magnetized in a plurality of magnetic poles, a three-phase A, B, C-phase phase coils 10a, 10b,
10c are three teeth 4a made of each wound magnetic, 4b, 4c Ri is Do a pair, 4a, 4b, 4c
Are arranged in this order, that of plural sets linked by thin portion 6, in the core radial gap type motor with which a Stator portion 7 made are arranged on the outer periphery of the rotor portion, disposed on both sides, A-phase teeth 4a and C-phase teeth
Magnetic path of magnetic flux 11ac passing through wire 4c, one side and center
A-phase teeth 4a and B-phase teeth arranged in the section
4b, the magnetic path of the magnetic flux 11ab, and the other side and the central part
C-phase teeth 4c and B-phase teeth 4b arranged
Of the magnetic path length of the magnetic flux 11cb passing through the
In order to obtain the same driving force , the central part of the three-phase coil
The number of windings of each of the B- phase teeth 4b arranged on the other side is changed by the number of windings of the A- and C- phase teeth 4a, 4c arranged on the other side.
Radial gap type motor with core, characterized in that the number of turns is different from that of the core . Wherein the outer peripheral surface the rotor part which is magnetized in a plurality of magnetic poles, a three-phase A, B, C-phase phase coils 10a, 10b,
10c are three teeth 4a made of each wound magnetic, 4b, 4c Ri is Do a pair, 4a, 4b, 4c
Are arranged in this order, that of plural sets linked by thin portion 6, in the core radial gap type motor with which a Stator portion 7 made are arranged on the outer periphery of the rotor portion, disposed on both sides, A-phase teeth 4a and C-phase teeth
Magnetic path of magnetic flux 11ac passing through wire 4c, one side and center
A-phase teeth 4a and B-phase teeth arranged in the section
4b, the magnetic path of the magnetic flux 11ab, and the other side and the central part
C-phase teeth 4c and B-phase teeth 4b arranged
Of the magnetic path length of the magnetic flux 11cb passing through the
In order to obtain the same driving force , the central part of the three-phase coil
The magnetic resistance of each set of teeth 4b of phase B arranged on the other side is changed to the set of teeth 4a, 4c of sets A and C arranged on the other side.
Radial gap type motor with core characterized by different magnetic resistance . 3. A outer circumferential surface magnetized rotor portion into a plurality of magnetic poles, a three-phase A, B, C-phase phase coils 10a, 10b,
10c are three teeth 4a made of each wound magnetic, 4b, 4c Ri is Do a pair, 4a, 4b, 4c
Are arranged in this order, that of plural sets linked by thin portion 6, in the core radial gap type motor with which a Stator portion 7 made are arranged on the outer periphery of the rotor portion, disposed on both sides, A-phase teeth 4a and C-phase teeth
Magnetic path of magnetic flux 11ac passing through wire 4c, one side and center
A-phase teeth 4a and B-phase teeth arranged in the section
4b, the magnetic path of the magnetic flux 11ab, and the other side and the central part
C-phase teeth 4c and B-phase teeth 4b arranged
Of the magnetic path length of the magnetic flux 11cb passing through the
In order to obtain the same driving force , the central part of the three-phase coil
The width of each set of teeth 4b of the B phase arranged on
A radial gap type motor with a core, characterized in that the width of each of the teeth 4a, 4c of the A and C phases arranged in the motor is different from each other.