JPH09308174A - Molded motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability of a molded motor when assembling a board into it, by preventing the peelings and disconnections of the patterns of its board and preventing the breakings of the mounting parts on its board, and by reducing the number of its parts. SOLUTION: As a board integrated into a molded motor 1, a metallic board 5 using a metallic plate 6 as its base material is used. Fastening an insulation material 7 to the surface of the metallic plate 6 of the metallic board 5, such electronic parts as a transistor 24 are mounted on the insulation material 7 to perform the wirings of the patterns for interconnecting the electronic parts or for connecting the windings of the molded motor 1 therewith.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION A substrate on which a circuit having electronic parts for driving a motor or controlling the number of revolutions is formed, or
The present invention relates to a molded motor in which a substrate on which a winding connection pattern is wired is molded.

[0002]

2. Description of the Related Art Molded motors can reduce the noise of the molded motor because the vibration generated from the stator can be enclosed by molding the stator with premix, thermosetting resin, or thermoplastic resin. Is possible.
Further, since the winding is fixed by molding, it is not necessary to consider the insulation distance due to the movement of the winding, and the insulation distance corresponding to the movement of the winding can be shortened.
That is, the molded motor can be made compact. Further, since the mold frame can be formed in various shapes by the mold, it can be formed in conformity with the shape of the device that houses the mold motor.

Further, a molded motor is formed by molding a substrate for driving the molded motor, a substrate for controlling the number of revolutions, or a substrate on which a pattern for connecting each winding is printed. There is no need to provide a separate board outside, and the molded motor can be made compact when the entire motor system is viewed.

An inner rotor type brushless DC motor having a mold frame molded by a premix, which is an example of a conventional molded motor, will be described with reference to FIGS. 2 and 3. FIG. 2 is a partial side sectional view of a conventional brushless DC motor. FIG.
FIG. 3 is a partially enlarged cross-sectional view of the board part in FIG. 2.

In FIG. 2, a brushless DC motor 10
Is a premix 11 based on thermosetting resin
With this, the stator 12 and the substrate 13 are molded,
The cylindrical mold frame 14 and the permanent magnet 1
5, a rotor 16 that is housed on the inner peripheral side of the mold frame 14, a bearing 17 that supports the rotor 16 to allow the rotor 16 to rotate, and an opening portion of the mold frame 14 that houses the bearing 17. And a ball housing 18 attached to the.

The stator 12 includes a laminated core 19 and an insulating material 2.
It is composed of a plurality of windings 21 wound around the laminated core 19 with the winding 0 interposed therebetween. In addition, the substrate 1 is adjacent to the stator 12.
3 is attached to the stator 12. And the substrate 1
The end of the winding 21 is connected to the end of the winding 3 (not shown). A pattern for connecting the windings 21 is provided at the end of the substrate 13 on which the windings 21 are wound.

The rotor 16 is composed of a shaft 22, a yoke 23 fixed to the outer periphery of the shaft 22, and a permanent magnet 15 fixed to the outer periphery of the yoke 23.

In FIG. 3, the substrate 13 has windings 21
A pattern is provided for connecting the two. A plurality of electronic components for driving a motor, such as six transistors 24 for driving the brushless DC motor 10, are mounted to form a motor driving circuit. And
When the brushless DC motor 10 is driven, a current flows through the transistor 24 to the winding 21. At this time, this current causes the transistor 24 to generate heat, which may be destroyed by heat depending on the usage state of the transistor 24. Therefore, in order to prevent the transistor 24 from being destroyed, the heat sink 25 is attached to the substrate 13 in close contact with the transistor 24.

Further, on the substrate 13, a magnetic sensitive element 26 such as a Hall IC for detecting the magnetic pole position of the permanent magnet 15 is provided.
Is installed. A holder 27 is attached to the substrate 13 so as to protect the magnetic sensitive element 26 from the pressure during molding and to position the magnetic sensitive element 26 so as to cover the magnetic sensitive element 26. Thus, the magnetically sensitive element 26 attached to the substrate 13 is the permanent magnet 1 attached to the rotor 16.
A voltage is generated in response to the magnetism of No. 5, and the position of the permanent magnet 15 is detected.

[0010]

In the conventional molded motor as described above, when molding the stator,
As in the past, when a substrate of paper phenol base material or glass epoxy base material is attached to the laminated core and molded, the substrate is deformed due to heat and pressure during molding,
Problems such as parts destruction and pattern breakage occurred.

Further, for example, as described above, a driving transistor is mounted on the substrate in order to drive the brushless DC motor. Then, it is necessary to attach a heat sink to the substrate in order to dissipate the heat from the driving transistor, resulting in an increase in the number of parts and man-hours such as manual mounting of the heat sink.

[0012]

Therefore, according to the present invention, a metal plate used as a base material of a substrate, an insulating material fixed on the surface of the metal plate, and an insulating material formed on the insulating material are formed. Provided is a molded motor, which is characterized in that a metal substrate constituted by a circuit or a wiring connection pattern wired on an insulating material is molded.

[0013]

When the metal substrate mounted with the electronic parts for driving the mold motor or controlling the rotation speed is mounted on the laminated core and molded, the mechanical strength against pressure and heat at the time of molding is improved as compared with the conventional substrate, and the pattern is formed. Peeling, pattern breakage, and damage to mounted parts are eliminated. Moreover, when an aluminum plate is used as the base material of the metal substrate, a heat sink for dissipating heat generated from the parts is not required.

[0014]

EXAMPLE An example of the present invention will be described with reference to FIG. FIG. 1 is a partial side sectional view of a brushless DC motor according to the present invention.

In FIG. 1, a brushless DC motor 1
Like the conventional brushless DC motor, is composed of a mold frame 2 molded by premixing, a rotor 3, a bearing 4, and a ball housing. A metal substrate 5 is built in the mold frame 2.

A metal plate 6 made of aluminum, iron or the like is used as a base material of the metal substrate 5, and an outer peripheral surface of the metal plate 6 is covered with a substrate insulating material 7. Then, electronic components such as the transistor 24 are mounted on the substrate insulating material 7, and a pattern 9 for connecting the electronic components is printed and wired. An insulating material 8 is applied to insulate the patterns 9.

Further, the metal substrate 5 is superior in mechanical strength to the above-mentioned conventional substrate made of paper phenol or the like.
Therefore, the pressure at the time of molding is the metal substrate 5
Since the deformation ratio of the substrate is small even when the above is applied to the substrate, it is possible to suppress the breakage or peeling of the printed wiring pattern 9. Further, by using aluminum having a good heat dissipation property as the base material of the metal substrate 5, the heat generated from the electronic components such as the transistor 24 through which a large current flows can be dissipated through this aluminum, so that it can be mounted on the conventional substrate. No heat sink is needed.

[0018]

According to the present invention, pattern peeling, pattern breakage, and breakage of mounted parts at the time of molding are reduced or eliminated. Moreover, since a heat sink is not required, the substrate area can be reduced, that is, the molded motor can be made compact. Furthermore, since the number of parts is reduced, workability during board assembly is improved.

[0019]

[Brief description of drawings]

FIG. 1 is a partial side sectional view of a brushless DC motor according to the present invention.

FIG. 2 is a partial side sectional view of a conventional brushless DC motor.

FIG. 3 is a partially enlarged cross-sectional view of a board portion in FIG.

[Explanation of symbols]

 1 ... Brushless DC motor 2 ... Mold frame 3, 16 ... Rotor 4, 17 ... Bearing 5 ... Metal substrate 6 ... Metal plate 7 ... Substrate insulating material 8, 20 ... Insulating material 9 ... Pattern 10 ... Brushless DC motor 11 ... Pre Mix 12 ... Stator 13 ... Substrate 14 ... Mold Frame 15 ... Permanent Magnet 18 ... Ball Housing 19 ... Laminated Core 21 ... Winding 22 ... Shaft 23 ... Yoke 24 ... Transistor 25 ... Heat Sink 26 ... Magnetic Sensitive Element 27 ... Holder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichiro Katagiri 13-10 Ekimaecho, Obama City, Fukui Prefecture Shibaura Manufacturing Co., Ltd. Obama Factory

Claims (1)

[Claims] 1. A molded motor in which a substrate having a circuit provided with electronic components for driving a motor or controlling the number of revolutions or a substrate having a wiring connection pattern is molded is molded. It is composed of a metal plate used as a material, an insulating material fixed on the surface of the metal plate, a circuit formed on the insulating material, or a winding connection pattern wired on the insulating material. A molded motor, characterized in that a metal substrate is molded.