JPH08182288A - Brushless motor - Google Patents

Abstract

PURPOSE: To provide a brushless motor which is used for OA, acoustic, video and information recording equipment and is thin and has excellent characteristics. CONSTITUTION: A rotary shaft 11 is retained by a bearing 13 retained by a housing 12 and a thrust support plate 14 and retains a rotor frame 16 with a cylindrical rotary permanent magnet 15 which is subjected to multi-pole magnetization. Also, an IC 121 and electronic parts 122 are mounted so that the package part of the IC 121 enters a cut-out part on a metal substrate 20 on an opposite side of a rotor frame at the peripheral part of a core 19 where a coil winding 18 is wound via an insulator 17 and the core 19 is provided on the metal substrate 20 so that it opposes the cylindrical rotary permanent magnet 15, thus constituting a brushless motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a brushless motor used in OA, audio, video equipment or information recording equipment.

[0002]

2. Description of the Related Art In recent years, OA, audio, video equipment and information recording equipment have tended to be smaller and thinner. As a result, brushless motors have been required to be smaller and thinner.

An example of a conventional brushless motor will be described below with reference to the drawings. FIG. 5 is a sectional view of a conventional brushless motor. In FIG. 5, the rotary shaft 51
Holds a rotor frame 56 having a multi-pole magnetized cylindrical rotating permanent magnet 55, which is held by a bearing 53 held by a housing 52 and a thrust receiving plate 54. Further, the IC 61 is formed on the metal substrate 60 opposite to the rotor frame side around the core 59 around which the winding 58 is wound via the insulator 57.
And an electronic component 62 is mounted, and the core 59 is attached to the metal substrate 60 so as to face the cylindrical rotating permanent magnet 55.
The brushless motor is arranged on the upper side.

[0004]

However, in the above-mentioned conventional structure, the IC is arranged below the winding wound around the core on the metal substrate, so that it is difficult to reduce the thickness of the brushless motor. Was.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a thinner brushless motor.

[0006]

In order to achieve this object, a brushless motor of the present invention is provided with the I of the metal substrate.
A notch is provided at the location of C, and the package portion of the IC is placed there.

Further, the end face of the hole is processed to eliminate the contact between the lead frame of the IC and the metal portion of the metal substrate.

Further, the lead frame of the IC is processed into a straight line and a thinner metal substrate is used.

Further, the number of windings on the IC is reduced.

[0010]

With this configuration, since the IC, which requires the most space in the circuit components, is arranged in the hole of the metal substrate, a thin brushless motor is realized without being restricted by the winding wound around the core. can do.

Further, since only the number of turns on the upper part of the IC is reduced, a thin brushless motor can be realized without deteriorating the characteristics.

[0012]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a brushless motor according to the first embodiment of the present invention. In FIG. 1, a rotating shaft 11 is a bearing 13 held by a housing 12.
And a rotor frame 16 having a cylindrical rotating permanent magnet 15 which is held by the thrust receiving plate 14 and is magnetized in multiple poles. In addition, the metal substrate 20 on the side opposite to the rotor frame on the periphery of the core 19 around which the winding 18 is wound via the insulator 17.
The IC 121 and the electronic component 122 are mounted so that the package portion of the IC 121 fits in the upper cutout portion, and the core 19 is arranged on the metal substrate 20 so as to face the cylindrical rotating permanent magnet 15 to form a brushless motor. I am configuring.

As described above, according to the brushless motor of the first embodiment of the present invention, I is formed in the cutout portion on the metal substrate 20.
Since the package portion of C121 is arranged, the gap between the winding 18 and the metal substrate 20 can be made small, so that the brushless motor can be greatly thinned.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional view of a brushless motor according to the second embodiment of the present invention. In FIG. 2, 21 is a rotating shaft, 22 is a housing, 23 is a bearing, 2
4 is a thrust receiving plate, 25 is a cylindrical rotating permanent magnet, 26
Is a rotor frame, 27 is an insulator, 28 is a winding, 29 is a core, 30 is a metal substrate, 131 is an IC, 132 is an electronic component, and the above is the same as the configuration of FIG. The difference from the configuration of FIG. 1 is that the end surface of the cutout portion of the metal substrate 30 is processed.

By configuring the brushless motor as described above, the insulation between the metal substrate 30 and the IC 131 can be performed more reliably.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a sectional view of a brushless motor according to the third embodiment of the present invention. In FIG. 3, 31 is a rotating shaft, 32 is a housing, 33 is a bearing, 3
4 is a thrust receiving plate, 35 is a cylindrical rotating permanent magnet, 36
Is a rotor frame, 37 is an insulator, 38 is a winding, 39 is a core, 40 is a metal substrate, 141 is an IC, 142 is an electronic component, and the above is the same as the configuration of FIG. The difference from the configuration of FIG. 1 is that the lead frame of the IC 141 is processed on a straight line.

By configuring the brushless motor as described above, it is possible to reduce the thickness of the metal substrate 40 and to provide a low-cost brushless motor that is thin.

(Fourth Embodiment) A fourth embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a sectional view of a brushless motor according to the fourth embodiment of the present invention. In FIG. 4, a rotating shaft 41 is a bearing 43 held by a housing 42.
And a rotor frame 46 having a cylindrical rotating permanent magnet 45, which is held by the thrust receiving plate 44 and is magnetized in multiple poles. In addition, the IC 151 and the electronic component 152 are mounted on the metal plate 50 opposite to the rotor frame side around the core 49 around which the winding 48 having the number of turns reduced by the insulator 47 is wound. The core 49 is arranged on the metal substrate 50 so as to face the permanent magnet 45 and be below the IC 151 where the number of windings of the winding 48 is reduced to form a brushless motor.

As described above, according to the brushless motor of the fourth embodiment of the present invention, the winding 48 whose number of turns is partially reduced
Since the IC 151 is disposed below the portion where the number of turns is reduced, the gap between the winding 48 and the metal substrate 50 can be reduced, and the brushless motor can be thinned.

[0024]

As described above, according to the present invention, the IC package portion is arranged in the cutout portion on the metal substrate.
The gap between the winding and the metal substrate can be reduced, and a thin brushless motor can be provided.

Further, in the fourth embodiment, since the number of turns of the winding is reduced only on the IC, the gap between the winding and the metal substrate can be reduced and a thin brushless motor can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of a brushless motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a brushless motor according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a brushless motor according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a brushless motor according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a conventional brushless motor.

[Explanation of symbols]

11,21,31,41,51 Rotating shaft 12,22,32,42,52 Housing 13,23,33,43,53 Bearing 14,24,34,44,54 Thrust receiving plate 15,25,35,45 , 55 rotating permanent magnets 16, 26, 36, 46, 56 rotor frame 17, 27, 37, 47, 57 insulating material 18, 28, 38, 48, 58 winding 19, 29, 39, 49, 59 core 20, 30, 40, 50, 60 Metal substrate 61, 111, 121, 131, 141, 151 IC 62, 112, 122, 132, 142, 152 Electronic component

Claims (4)

[Claims] 1. A rotor portion having a rotating permanent magnet held on a rotating shaft and magnetized in multiple poles, a bearing portion rotatably holding the rotating shaft, and a core arranged so as to face the rotating permanent magnet. A winding wound around the core via an insulator; an IC and an electronic component for rotating or controlling the rotation of the rotor unit; and a stator unit having a metal substrate on which the IC and the electronic component and the core are mounted. In the brushless motor, the IC of the metal substrate
A brushless motor characterized in that a cutout into which the package part of the IC is inserted is provided at the location where 2. The brushless motor according to claim 1, wherein an end surface of the cutout portion of the metal substrate is processed. 3. The lead frame of an IC for rotation or rotation control is processed into a straight line.
Brushless motor described. 4. A rotor portion having a rotating permanent magnet held on a rotating shaft and magnetized in multiple poles, a bearing portion rotatably holding the rotating shaft, and a core arranged to face the rotating permanent magnet. A winding wound around the core via an insulator; an IC and an electronic component for rotating or controlling the rotation of the rotor unit; and a stator unit having a printed board on which the IC and the electronic component and the core are mounted. In the brushless motor configured as described above, the number of turns of the winding is reduced only in the upper portion of the IC for controlling the rotation or the rotation.