JP3011877B2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly, to a motor in which a control IC for controlling the rotation of a rotor can be closely attached to a motor mounting plate for mounting the motor to the outside. .

[0002]

2. Description of the Related Art A conventional motor mounting plate, a control IC,
A motor including a circuit board will be described with reference to FIG. The motor 50 shown in FIG. 3 is a brushless motor, in which a plurality of stator coils 52 are arranged side by side in the circumferential direction and fixed to a bearing housing 56 via a core 54. The rotor 58 includes a ring-shaped magnet 62 fixed to the inner peripheral surface of the cup 60 and a rotor shaft 64 erected from the center of the cup 60. The rotor shaft 64 is rotatably disposed in the bearing housing 56. Then, by selectively energizing the stator coil 52, the rotor 58 rotates. A control IC 66 for controlling the energization of the stator coil 52 and the like is provided on an upper surface of a circuit board 68 fixed to the bearing housing 56. In addition,
A chip component 74 is disposed in a gap 72 between the lead terminals 70 of the control IC 66 in order to increase the mounting density of the circuit board 68.

[0003] Reference numeral 76 denotes a motor mounting plate, which is externally fitted to and fixed to the bearing housing 56. Motor mounting plate 7
Numeral 6 is formed to have a size to cover the circuit board 68, and is formed of a metal (for example, iron) having a relatively high thermal conductivity in order to serve as a heat sink of the control IC 66 that generates remarkable heat. The circuit board 68 is disposed between the motor mounting plate 76 and the stator coil 52 in close proximity to the motor mounting plate 76, and the upper surface of the control IC 66 is provided with a heat transfer material (not shown) such as silicone grease, silicone rubber, or the like. ) Is in contact with the motor mounting plate 76 as its own heat sink in a state of being inserted. Reference numeral 78 denotes a bolt that connects the core 54 of the stator coil 52 and the motor mounting plate 76.

[0004]

However, the above-mentioned conventional motor 50 has the following problems. Control I
In order to efficiently transfer the heat generated from the C66 to the motor mounting plate 76, the control IC 66 and the motor mounting plate 76
It is necessary that the heat transfer member be in close contact with the heat transfer material. For this purpose, the distance between the circuit board 68 and the motor mounting plate 76 is accurately attached to the bearing housing 56 so that the distance becomes a preset length, and the control I
It is necessary to mount the C66 at a predetermined height with accuracy in accordance with the distance between the circuit board 68 and the motor mounting plate 76. Therefore, it is necessary to manage the warpage of the circuit board 68 and to process the motor mounting plate 76 and the bearing housing 56 with high accuracy, which increases the component cost. Also, the circuit board 6
It takes time to mount the control IC 66 on the control board 8 and to mount the circuit board 68 and the motor mounting plate 76 to the bearing housing 56, thereby increasing the manufacturing cost. Accordingly, an object of the present invention is to provide a motor that can reduce the product cost while securing the heat radiation effect of the control IC.

[0005]

To solve the above-mentioned problems, the present invention has the following arrangement. That is, a motor mounting plate made of metal for mounting the motor to the outside, a control IC for controlling the rotation of the rotor by controlling energization to the stator coil, and a circuit including the control IC are provided. In a motor comprising a motor mounting plate and a circuit board disposed close to the mounting plate and the stator coil, the control IC may be configured such that a spacer is interposed between the control IC and the circuit board. It is arranged on the surface of the circuit board on the side of the motor mounting plate, penetrates the motor mounting plate and is screwed with the spacer, and when rotated in a predetermined direction, the spacer can be moved to the motor mounting plate side. Tightening screws are provided,
The control IC is pushed by a spacer moving toward the motor mounting plate by the tightening screw and is disposed in close contact with the motor mounting plate. If this configuration is adopted, even if the adhesion between the control IC and the motor mounting plate is low due to a slight warpage of the circuit board, or the processing accuracy of the motor mounting plate is slightly low, etc. By turning the tightening screw, the control IC can be pushed toward the motor mounting plate via the spacer, so that the control IC can be brought into close contact with the motor mounting plate.

[0006] The spacer has a function of setting the height at which the control IC is mounted on the circuit board, and has a circuit board side surface between the control IC and the circuit board. By forming a concave portion so that a chip component constituting a part can be mounted, stress applied to the circuit board when the control IC is pushed toward the motor mounting plate side can be reduced, and components to the circuit board can be reduced. Can be increased.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The motor will be described by taking a brushless motor as an example. The same components as those of the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted. First, the configuration of the motor 10 will be described with reference to FIGS. The rotor 58 includes a ring-shaped magnet 62 fixed to the inner peripheral surface of the cup 60 and a rotor shaft 64 erected from the center of the cup 60. The rotor shaft 64 is rotatably disposed in the bearing housing 56. A plurality of stator coils 52 are arranged in the cup portion 60 in the circumferential direction and fixed to a bearing housing 56 via a core 54. Although not shown in FIG. 1, the configuration is similar to that of FIG.

The motor mounting plate 76 is fitted on the bearing housing 56, and the stator coil 5 is
The second core 54 is connected to the second core 54. Also, the motor mounting plate 7
On one end side (left end side in FIG. 1) of the mounting member 6, a mounting leg 12 extending toward the circuit board 68 is formed, and is fixed to the circuit board 68 by a fixing screw 14. The motor mounting plate 7
The other end of the circuit board 6 and the right side of the circuit board 68 facing the other end are not fixed by the mounting legs 12 as on the left end. Further, the motor mounting plate 76 is provided with a through hole 16 into which a tightening screw to be described later is inserted, and the position of the through hole 16 is determined by the control IC 66 mounted on the circuit board 68.
Are set so as to correspond to the screw grooves 18. In addition,
Since the fastening screw is a flat head screw,
The inner surface is formed in a tapered shape.

Next, a structure for mounting the control IC 66 on the circuit board 68 and a structure for closely attaching the control IC 66 to the motor mounting plate 76 will be described. The control IC 66 is provided on the circuit board 68 as shown in FIGS.
Are mounted with a spacer 20 formed of a synthetic resin material having electrical insulation therebetween. For attachment, the lead terminals 70 are inserted into the through holes 22 provided in the circuit board 68 and soldered.
The spacer 20 is provided with a control IC 66 (control IC 66).
Is an example of a dual in-line package), and the thickness is set in consideration of the height at which the control IC 66 is mounted on the circuit board 68. A fitting projection 24 is formed on the upper surface of the spacer 20 so as to fit into the heat sink mounting screw groove 18 in accordance with the outer shape of the package of the control IC 66 in the present embodiment. Play. A screw hole 26 into which a tightening screw described later is screwed is formed on the upper surface of the fitting projection 24. The circuit board 68 is provided on the lower surface of the spacer 20.
The recess 28 is formed to avoid the chip component 74 mounted between the lead terminals 70 of the control IC 66 above.
If not mounted between them, the recess 28 need not be provided. Further, in this example, the fitting protrusion 24 fitted to the screw groove 18 is provided according to the outer shape of the control IC 66.
In the case of the control IC 66 having no 8, the outer shape of the spacer 20 may be formed to be slightly larger than the outer shape of the control IC 66, and the screw hole 26 may be formed in this portion.

Subsequently, the motor mounting plate 7 of the control IC 66
6 will be described. First, as shown in FIG. 2, the tightening screw 30 is inserted into the through hole 16 from the upper surface of the motor mounting plate 76, and the screw provided between the tightening screw 30 and the fitting protrusion 24 of the spacer 20. Screw it into the hole 26. Thereafter, when the tightening screw 30 is turned in the screwing direction, the tightening screw 30 enters the screw hole 26,
Conversely, the spacer 20 moves to the motor mounting plate 76 side. Thus, the control IC 6 soldered to the circuit board 68
6 is also pushed by the spacers 20 and the motor mounting plate 76
And the upper surface of the control IC 66 is brought into close contact with the lower surface of the motor mounting plate 76. Since the motor mounting plate 76 plays a role of a heat sink of the control IC 66 that generates a remarkable amount of heat, it is possible to more efficiently cool by increasing the adhesion, and to prevent the control IC 66 from deteriorating.

Here, as shown in FIG.
Is mounted on the right side of the circuit board 68 with respect to the bearing housing 56, and the right side of the circuit board 68 is not fixed by the motor mounting plate 76 and the mounting legs 12 as described above. Along with 68, it can be drawn to the motor mounting plate 76 side. The variation in the mounting height of the control IC 66 is also reduced by the spacer 20, and the control IC 66
The distance between the upper surface of the motor board and the lower surface of the motor mounting plate 76 is
8 is set to a distance that will not be damaged even if it is drawn toward the motor mounting plate 76 and warped. Further, the circuit board 68 itself is also formed of a strong synthetic resin such as a glass epoxy resin, and is not easily damaged. The control IC 6
A heat transfer material such as silicone grease may be interposed between the motor 6 and the motor mounting plate 76 to increase the heat conductivity. As described above, various preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments.
Of course, many modifications can be made without departing from the spirit of the invention.

[0012]

When the motor according to the present invention is used, the circuit board may be slightly warped or the precision of processing of the motor mounting plate may be slightly low. Even if the performance is low, the control IC can be pushed to the motor mounting plate side via the spacer by turning the tightening screw, so that the control IC can be brought into close contact with the motor mounting plate, Heat generated from the control IC can be efficiently conducted to the metal motor mounting plate. The heat conducted to the motor mounting plate is
Since heat can be dissipated from the motor mounting plate having a large area, the heat dissipating effect of the control IC can be improved.
In addition, since it is necessary to process each part with high accuracy, and it is not necessary to have much accuracy in assembling each part, there is also an effect that the cost of parts and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a motor according to the present invention.

2 is a motor mounting plate, a circuit board, a control IC,
Exploded perspective view of a main part showing an assembling structure of a spacer and a spacer

FIG. 3 is a side sectional view showing a configuration of a conventional motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Motor 20 Spacer 30 Tightening screw 52 Stator coil 66 Control IC 68 Circuit board 76 Motor mounting plate

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 29/00 H02K 9/22

Claims (2)

(57) [Claims] 1. A motor mounting plate made of metal for mounting a motor to the outside, a control IC for controlling rotation of a rotor by controlling energization of a stator coil, and a circuit including the control IC. A motor having a circuit board disposed close to the motor mounting plate between the motor mounting plate and the stator coil, wherein the control IC has a spacer interposed between the motor mounting plate and the circuit board. In this state, it is disposed on the surface of the circuit board on the motor mounting plate side, penetrates the motor mounting plate and is screwed with the spacer, and when rotated in a predetermined direction, the spacer is moved to the motor mounting plate side. A movable tightening screw is provided, and the control IC is pushed by a spacer moving toward the motor mounting plate by the tightening screw and is disposed in close contact with the motor mounting plate. Data. 2. The spacer has a function of setting a height at which the control IC is mounted on the circuit board.
2. The motor according to claim 1, wherein a concave portion is formed on a surface on a circuit board side between the control IC and the circuit board so that a chip component constituting a part of the circuit can be attached. .