JP2008271701A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor with which an electromagnetic shielding effect can be obtained and which can be miniaturized. <P>SOLUTION: In the motor, a part of drive substrates 3a and 3b is exposed from a notch part 4c formed at an outer periphery of a casing body 4a. A casing base 31, a shielding case base 32 and a shielding case side 33 are formed in a base lid 4b fitted to a base opening of the casing body 4a. An opening 28 formed between the shielding case side 33 and the outer periphery of the casing body 4a is covered with a shielding case ceiling part 29 and is magnetically shielded. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motor that is operated in an environment with much electromagnetic interference such as an engine room environment of an automobile.

  FIGS. 7A and 7B are small brushless motors, which are configured by housing the rotor 1, the stator 2, and the drive substrate 3 in a motor casing 4. A magnetoelectric conversion element 5, a control circuit 6, and a power element 7 are mounted on the drive substrate 3. The magnetoelectric conversion element 5 is disposed on the drive substrate 3 in the vicinity of the rotor 1. The magnetoelectric conversion element 5 detects the magnetic poles of the rotor 1, and the control circuit 6 switches the energization to the plurality of stator windings 2 a via the power element 7 to generate a rotating magnetic field to rotationally drive the rotor 1.

In addition, as shown in FIG. 8, there is a motor that achieves a shielding effect by covering the outside of the motor A with a shield cover B.
JP 2004-254477 A

  In order to stably operate the motor shown in FIG. 7 in the engine room of an automobile, it is common to mount the shield cover B as shown in FIG. In an attempt to effectively shield the electromagnetic shield including a portion protruding from the motor casing 4, the size of the entire motor is increased and is not suitable for downsizing.

  An object of this invention is to provide the motor which can acquire sufficient electromagnetic shielding effect and can be reduced in size.

  According to a first aspect of the present invention, a rotor and a stator are disposed inside a motor casing formed by a casing body and a bottom lid that closes an opening at one end thereof, and energization of the windings of the stator is performed. A part of the drive board for rotating the rotor to drive the rotor by switching is arranged inside the motor casing, and the remaining part of the drive board is a notch formed on the outer periphery of the casing body A motor extending from the motor casing to the outside of the motor casing, wherein the bottom lid has a casing bottom for closing the opening of the casing body, a base end connected to the casing bottom, and the other end of the casing body. A shield case bottom extending from the cutout to the outside of the casing body, and connected to the shield case bottom and extending to the outside of the casing body. Forming a shield case side surface portion that covers a side of the remaining portion of the drive board that is being covered, and a shield case ceiling portion that covers an opening formed between the shield case side surface portion and the outer periphery of the casing body It is provided.

  According to a second aspect of the present invention, the motor according to the first aspect is characterized in that an opening through which the connector for electrical connection mounted on the drive board is exposed is formed at the bottom of the shield case of the bottom cover.

  A motor according to a third aspect of the present invention is the motor according to the second aspect, wherein a cable connector attached to an end of a wire harness is connected to the electrical connection connector exposed from the opening at the bottom of the shield case, and the opening and the motor The electrical connection connector and the cable connector are potted with a sealing resin material.

  According to this configuration, it is possible to effectively shield the electromagnetic wave including the remaining portion of the drive board that protrudes outside the casing body by the casing body, the bottom cover, and the ceiling.

Hereinafter, the motor of the present invention is explained based on an embodiment.
1 to 5 show a motor of the present invention.
The motor shown in FIG. 1A is a cross-sectional view taken along line A-AA in FIG.

  The motor casing 4 includes a metal casing body 4a and a metal bottom cover 4b. Inside the casing body 4a, the rotor 1, the stator 2, and part of the first and second drive substrates 3a and 3b are housed. The stator 2 is disposed coaxially with the output shaft 1 a of the rotor 1. The first drive board 3 a is disposed at the end of the rotor 1 and the stator 2 in the opposite direction of the output shaft 1 a of the rotor 1. A control circuit 6 and a power element 7 are mounted on the first drive board 3a.

  The second drive board 3b on which the magnetoelectric transducer 5 is mounted is disposed between the rotor 1 and the first drive board 3a, and the rotor 1 is inserted into a hole 3c formed in the center of the drive board 3a. Yes. The magnetoelectric conversion element 5 is disposed close to the rotor 1, and a detection signal or the like detected by the magnetoelectric conversion element 5 detecting the magnetic pole of the rotor 1 is transmitted from the second drive board 3 b to the control circuit 6 of the first drive board 3 a. The control circuit 6 switches the energization to the stator winding 2a through the power element 7 mounted on the same first drive board 3a to generate a rotating magnetic field to drive the rotor 1 to rotate. .

2 is a partially cutaway perspective view of the finished product, FIG. 3 is a view seen from the bottom side, and FIG. 4 is an exploded perspective view.
It is assembled as follows.

  When the stator 2 and the rotor 1 are accommodated in the casing body 4a and the first and second drive substrates 3a and 3b connected by the spacers 21a and 21b are accommodated next, the leads 22 of the stator winding 2a of the stator 2 are connected. The lead 22 of the stator winding is shown in FIG. 1 after being pulled out of the casing body 4a along the inner peripheral wall 23 of the casing body 4a, and after the first and second drive boards 3a and 3b are placed in the casing body 4a. As shown in FIG. 3, the first drive substrate 3a is connected to the first drive substrate 3a through the guide groove 20 of the second drive substrate 3b and the guide groove 14 of the first drive substrate 3a. The first and second drive substrates 3a and 3b are electrically connected by an electrode piece 16.

  A part of the first and second drive boards 3a and 3b set and positioned in the casing body 4a in this way is moved from the cutout portion 4c formed on the outer periphery of the casing body 4a to the outside of the casing body 4a. It protrudes.

Next, the bottom cover 4b is set on the casing body 4a.
As shown in FIG. 5A, the bottom lid 4b includes a casing bottom 31 that closes the bottom opening of the casing body 4a, a shield case bottom 32 having a base end connected to the casing bottom 31, and a shield case bottom 32. The shield case side surface portion 33 is formed of a connected shield case side surface portion 33. The shield case side surface portion 33 is connected to the shield case bottom portion 32 by bending as shown in FIGS. 34 is bent 90 degrees with a folding line, and both ends 33 a and 33 b of the shield case side surface portion 33 are bent in advance so as to follow the outer shape of the shield case bottom portion 32. In addition to the development shape and processing method shown in FIG. 5, various processing methods such as drawing using a press die and corresponding development shapes are possible.

  In the state where the bottom cover 4b thus processed is set in the bottom opening of the casing body 4a, the bottoms of the first and second drive substrates 3a and 3b are separated by the casing bottom 31 and the shield case bottom 32 of the bottom cover 4b. Electromagnetic shielded. The sides of the portions of the first and second drive boards 3 a and 3 b that protrude outward from the casing body 4 a are electromagnetically shielded by the shield case side surface portion 33.

  The upper portions of the first and second drive boards 3a and 3b that protrude outward from the casing body 4a are opened as shown in FIG. 4, but the bottom lid 4b is set at the bottom opening of the casing body 4a. Later, a metal shield case ceiling 29 separate from the bottom cover 4b is set at the opening 28 between the outer periphery of the casing body 4a and the shield case side surface 33 of the bottom cover 4b to be electromagnetically shielded. The

  Two legs 29a are integrally formed on the shield case ceiling 29, and the legs 29a face the second drive board 3b with a slight gap in the state where they are set in the opening portion 28, and a connector is inserted. In this case, the deformation of the second driving board 3b is limited, and stress is prevented from being applied to the electronic components and solder mounted on the second driving board 3b when the connector is inserted.

  Further, as shown in FIG. 5, an opening 35 is formed in the shield case bottom 32 of the bottom cover 4b. When the bottom cover 4b is set in the bottom opening of the casing body 4a, the opening 35 is opened as shown in FIG. 3), the electrical connection connector 36 mounted on the first drive board 3a is exposed as shown in FIG. A cable connector 38 attached to the end of the wire harness 37 is connected to the electrical connection connector 36 as shown in FIG. 6 so that dust does not enter from the gap between the opening 35 and the electrical connection connector 36. Potted with a sealing resin material 39. At this time, the cable connector 38 and the wire harness 37 are also potted together with the sealing resin material 39, and the reliability of connection between the electrical connection connector 36 and the cable connector 38 is reduced due to stress and vibration transmitted from the wire harness 37. This makes it easy to attach the wire harness.

In addition, as the casing body 4a, the bottom cover 4b, and the shield case ceiling portion 29, a galvanized steel plate or the like can be used.
In this way, the bottom cover 4b is configured in a special shape, and by using the shield case ceiling 29, a desired magnetic shield effect can be obtained without increasing the size, and unnecessary radiation from the motor to the outside can be obtained. The first and second drive boards 3a and 3b can be operated stably without being affected by the reduction and the interference electromagnetic wave existing in the motor use environment. Further, it is possible to prevent the reliability of the connection of the electrical connection connector 36 and the cable connector 38 from being lowered due to dust intrusion into the motor or stress or vibration transmitted from the wire harness 37.

  The present invention can contribute to improving the reliability of various devices using a small motor.

Longitudinal sectional view and transverse sectional view of the motor of the present invention Partially cutaway perspective view of the same embodiment The perspective view seen from the bottom side of the embodiment Exploded perspective view of the same embodiment Exploded view and front view of bottom lid of same embodiment Sectional view after potting of the same embodiment Longitudinal and transverse sections of a typical motor Illustration of conventional motor with shield case

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 2 Stator 3a, 3b 1st, 2nd drive board 4 Motor casing 4a Casing main body 4b Bottom cover 4c Notch 31 formed in the outer periphery of casing main body 4a Casing bottom 32 Shield case bottom 33 Shield case side part 34 Connection portions 33a and 33b between the shield case bottom portion 32 and the shield case bottom portion 32. Both ends 28 of the shield case side surface portion 33. An opening portion 29 between the bottom cover 4b and the shield case side surface portion 33. Shield case ceiling portion 29a. Legs 35 Shield case bottom 32 opening 36 Electrical connection connector 37 Wire harness 38 Cable connector 39 Resin material for sealing

Claims (3)

The rotor and the stator are arranged inside a motor casing formed by a casing body and a bottom lid that closes an opening at one end thereof, and the rotating magnetic field is generated by switching energization to the windings of the stator to generate the rotor. A part of the drive board for rotationally driving is disposed inside the motor casing, and the remaining part of the drive board is extended outside the motor casing from a notch formed on the outer periphery of the casing body. A motor,
The bottom lid
A casing bottom for closing the opening of the casing body;
A shield case bottom portion having a base end connected to the casing bottom portion and the other end extending from the cutout portion of the casing body to the outside of the casing body;
Forming a shield case side surface that covers the side of the remaining portion of the drive board connected to the bottom of the shield case and extending to the outside of the casing body;
The motor which provided the shield case ceiling part which covers the opening formed between the said shield case side part and the outer periphery of the said casing main body. The motor according to claim 1, wherein an opening through which an electrical connection connector mounted on the drive board is exposed is formed in the bottom of the shield case of the bottom cover. A cable connector attached to an end of a wire harness is connected to the electrical connection connector exposed from the opening at the bottom of the shield case, and the opening, the electrical connection connector, and the cable connector are potted with a sealing resin material. Item 3. The motor according to Item 2.

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