JPH01174253A - Brushless motor - Google Patents

Abstract

PURPOSE:To increase output per unit volume of a motor by holding a stator coil assembly between a pair of flat type rotor magnets and mounting pair of rotor magnets on a common rotary shaft as a unit. CONSTITUTION:A stator coil assembly 8 is equipped with a magnetic board 11 having a plane shape of a generally doughnut-form and flat type stators 13 mounted on both faces 12 and 14 of the magnetic board 11. A pair of flat type rotor magnets 15 is provided at a specific interval so as to hold the stator assembly 8, and at the same time, is mounted on a rotary shaft 3 as a unit. N pole, S pole... are alternately provided every specific central angle on the sides of the rotor magnets 15 opposite to the stator coils 13.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to brushless motors.

[Conventional technology and its problems]

BACKGROUND ART Conventionally, brushless motors in which a cylindrical rotor magnet is disposed on the outer circumferential side of a stator have been widely used.

However, with this conventional shape and structure, there was a limit in meeting the demand for flattening.

It is an object of the present invention to solve the above-mentioned problems and to provide a flat brushless motor that can obtain a large output compared to its overall volume.

[Means for solving problems]

The present invention includes a stator coil assembly consisting of a magnetic material substrate and flat stator coils sprayed on both sides of the magnetic material substrate, and a pair of flat stator coils are arranged at a predetermined interval so as to sandwich the assembled body. A rotor magnet is provided, and the pair of rotor magnets are integrally provided on a common rotating shaft.

[Effect]

By arranging the stator coil and rotor magnet on both sides of the magnetic substrate, the output per unit volume of the motor can be greatly increased compared to when these are provided only on one side of the substrate. The flat stator coil does not need to be wound with other members to form it, and only the wound body is attached to the surface of the magnetic material substrate, so the structure is simple and easy to assemble.

〔Example〕

Embodiments of the present invention will be explained in detail based on the drawings.

In FIG. 1, 2 and 2 are rotors fixed to the rotating shaft 3, one rotor 1 is directly attached to one end 4 of the rotating shaft 3, and the other rotor 2 is attached to the outer circumference of the rotating shaft 3. It is attached via a mounting member 5 fixed to the surface. The rotating shaft 3 is rotatably supported in a hair ring 6.6, which bearing 6.6 is held in a cylindrical member 7. A stator coil assembly 8 is attached to the outer circumferential surface of the cylindrical member 7, and the cough assembly 8 is fixed to other members 9 by connectors IO such as screws.

Thus, the stator coil assembly 8 includes a magnetic material substrate 11 having a substantially doughnut-shaped planar shape, and flat stator coils 13 attached to both surfaces 12 and 14 of the magnetic material substrate 11.
It is equipped with... The stator coils 13 are formed by winding coil wires to form flat wound bodies, and a plurality of such wound bodies are fixed to both surfaces 12 and 14 of the magnetic material substrate 11 with adhesive or the like. has been done. When the flat stator coil 13... is viewed from above,
They are arranged at the same position on both sides 12 and 14 of the magnetic substrate 11, respectively. Reference numeral 15.15 denotes a pair of flat rotor magnets, which are disposed at a predetermined interval so as to sandwich the stator coil assembly 8, and are integrally provided with the rotating shaft 3. Specifically, the rotor magnet 15
．． 15 is a rotor body 1 formed in a shallow dish shape of the rotor 2;
7.17, and faces the stator coil 13.13 with a small gap in the axial direction. Note that the rotor magnets 15, 15 are sequentially magnetized as N poles, S poles, N poles, and S poles at predetermined central angles on the side facing the stator coils 13, . . . . On the concave side, the stator coils 13... are connected to the magnetic material substrate 11 as shown in FIGS.
When viewed in plan, both ends of the stator coils 13.13 disposed at the same position in the circumferential direction are connected to both coils 13.13.
13 are connected in series.

Various electronic components are mounted on the magnetic material substrate 11, and a circuit board (not shown) is connected thereto. 16... is a magnetic sensor attached to one surface 14 of the magnetic material substrate 11, and the rotor magnet 71-1 is caused by the magnetic sensor 16...
The rotational position of the motor 5 is detected, and a control current corresponding to the rotational position is applied to each coil 13 to rotate the motor.

By connecting corresponding stator coils 13.13 arranged at the same position in the circumferential direction in parallel as shown in FIG. 4, one end A, C of the stator coil 13.13
The voltage VE between them can be 2 in the case of FIG. In this way, the rated voltage can be set to two types by changing the wiring connections.

The magnetic substrate 11 serves as a yoke, and also functions as a bracket 7 that is interposed between the bearing 6.6 and the other member 9 and supports the rotating shaft 3.

Unlike the above embodiment, as shown in FIGS. 5 and 6, when the corresponding flat stator coils 13 and 13 are viewed from each other across the magnetic substrate 11, they are separated from each other by a predetermined angle θ. If the stator coils 13 and 13 are disposed at different positions in the circumferential direction, the torque waveforms c and c' due to the corresponding stator coils 13 and 13 will be
have the same shape with one side translated in parallel to the other by the above angle θ, that is, the shift angle θ. As shown in FIG. 6, the waveform of the composite torque produced by the two coils 13, 13 is relaxed in the abrupt shape change portion, the torque ripple of the composite torque is reduced, and the twitching is improved. In order to obtain the same effect, as shown in Fig. 7, a pair of loaf mugs with 5
, 15 may be arranged so as to be shifted from each other by a shift angle θ.

As another embodiment, as shown in FIG. 8, one rotor 1 may be directly connected to the other rotor 2 on the outer peripheral end side so that they rotate as one. On the concave side, a case is shown in which the bent outer peripheral edge of one rotor main body 17 is fitted and fixed to the bent outer peripheral edge of the other rotor main body 17. Note that the cylindrical member 7 is directly fixed to another member 9, and
8 is the connector.

As shown in FIG. 9, the rotor body of one rotor 1 may be omitted, and the rotor magnet 15 made of a resin magnet or the like may be directly fixed to the other rotor 2.

In the above embodiment, the stator coils 13 and the rotor magnets 15 facing the same are disposed not only on one side 12 of the magnetic substrate 11 but also on the other side 14 with the magnetic substrate 11 in common. Furthermore, since parts such as the bearing 6゜6, the cylindrical member 7..., the magnetic sensor 16, etc. are also common, the output is lower than when the stator coil 13..., etc. are provided only on the negative side 12. is almost doubled, but the overall volume of the motor increases only slightly. In particular, when applied to a small output motor, it becomes possible to further reduce the axial dimensions of the magnetic substrate 11, flat stator coil 13..., and flat nine-tapered magnet 15.15. , it becomes possible to make the device thinner. Further, it is also possible to use a method in which one rotor is made removable and the device is operated with only the other rotor attached.

〔Effect of the invention〕

The present invention has the following remarkable effects due to the above-described configuration.

■ It becomes possible to provide a brushless motor with a large output per unit volume. In particular, it has become possible to make it flatter and more compact.

(2) By changing the wiring of the flat stator coils 13..., it is possible to set the rated voltage to two types.

■ It is also easy to arrange the corresponding flat stator coils 13, 13 or rotors 1, 2 across the magnetic material substrate 11 so as to be offset from each other in the circumferential direction when viewed from above, thereby reducing torque ripple. becomes smaller, improving the stiffness during operation and improving motor performance.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view showing the main parts of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the arrangement of stator coils, FIGS. 3 and 4 are explanatory diagrams of how to connect the stator coils, and FIG. The figure is a partially omitted plan view showing the arrangement when the corresponding stator coils are offset from each other, Figure 6 is a waveform diagram of the generated torque, and Figure 7
The figure is a partially omitted plan view showing the arrangement when the corresponding rotor magnets are displaced from each other, and FIGS. 8 and 9 are cross-sectional front views of the main parts of the respective embodiments. 3...Rotating shaft, 8...Stator coil assembly, 11
... Magnetic material substrate, 12 ... surface, 13 ... flat stator coil, 14 ... surface, 15 ... rotor magnet. Patent applicant Nidec Corporation Figure 1 Figure 2 Figure 1 Figure 6 Figure 7!

Claims (1)

[Claims] 1. A magnetic material substrate 11 and both surfaces 12 of the magnetic material substrate 11
, 14 with flat stator coils 13, 13 attached to them,
A pair of flat rotor magnets 15, 15 are arranged at a predetermined interval so as to sandwich the stator coil assembly 8, and the pair of rotor magnets 15, 15 are rotated in common. A brushless motor characterized by being integrally provided with a shaft 3.