JP4684340B2 - Molded motor - Google Patents

Description

  The present invention relates to a motor that is used in a relatively large and humid place such as a washing machine and has a large vibration.

  Conventionally, a molded motor that covers a stator winding with a resin member is known. (See Patent Document 1)

  In the case of a molded motor used in an air conditioner or the like as in the above patent document, the wiring board is integrally molded with resin. However, when used in a larger motor, for example, a washing machine, the wiring board is integrated with the motor. When it molds, there exists a problem which a wiring board and the electronic component arrange | positioned to it are damaged by the resin pressure at the time of molding. In addition, the wiring board cannot be replaced.

  In consideration of the above problems, an arc-shaped wiring board with a position sensor attached is fitted into the housing and fixed with screws, and an arc-shaped sensor holder covered with potting resin is provided, and attached to one end surface of the stator. It has been conventionally known. (See Patent Document 2)

  Further, a motor in which a temperature protection element such as a thermal protector is disposed in the vicinity of a winding and covered with a resin has been conventionally known. (See Patent Document 3)

JP 2007-295733 A JP 2003-88079 A Japanese Unexamined Patent Publication No. 09-9550

  However, since the rotor is arranged on the inner peripheral side of the stator of the motor, when the sensor holder is attached, it cannot be attached to the inner peripheral side with screws or the like. Therefore, the sensor holder is screwed only on the outer peripheral side of the stator. However, in the case of a motor that is used in an environment where vibration is very large, such as a motor for a washing machine, if only one of the outer peripheral sides is attached, the sensor holder will shake due to the vibration, and the detection accuracy of the position sensor will deteriorate, or the sensor will The holder may come off.

  Further, a relatively large motor such as a washing machine motor has a large mold pressure, and if the thermal protector is covered with resin as in the conventional example, there is a problem that the mold pressure is damaged. Further, the mold pressure is also applied to the thermal protector contact portion, which may adversely affect the operation. Therefore, it is necessary to arrange the thermal protector on the surface of the stator mold. However, when using the motor with very large vibration as described above, it is necessary to fix the thermal protector so that it does not move from the specified position.

  However, in order to form a structure for fixing the thermal protector on the stator mold, the stator mold is complicated and expensive. Therefore, it is necessary to provide a dedicated part for the thermal protector, which increases the cost even in this case.

  In view of the above-described conventional problems, the present invention can reliably hold a sensor holder even in a motor with large vibration, provides a configuration with increased mounting strength, and does not require a holder for various sensors. It is intended to provide an inexpensive and simple configuration.

According to the first aspect of the present invention, there is provided a substantially circular stator, a wiring board provided with a position sensor for detecting the rotational position of the rotor, a storage portion for storing the wiring board, and the stator. It is composed of a body part for mounting, and the length of the storage part in the circumferential direction is longer than the length of the body part in the circumferential direction, and the storage part is arranged in an arc shape so as to be arranged inward in the axial direction from the body part. A molded motor in which a part or the whole of the stator is covered with resin, and a plurality of protrusions are integrally formed with resin on the inner peripheral side and outer peripheral side of the stator, A mold characterized in that a fitting portion is provided on the outer peripheral side of the sensor holder to fit with the outer peripheral projection, and the vicinity of both ends in the circumferential direction of the storage portion of the sensor holder is locked by the inner peripheral projection. Provide a motor.

In the invention of claim 2 , a concave portion is formed at an edge on the inner peripheral side of the stator, while a convex portion is formed at a portion of the storage portion that contacts the inner peripheral side of the stator, and the concave portion and the protruding portion The molded motor according to claim 1 , wherein the molded motor is engaged.

According to a third aspect of the present invention, in the body portion of the sensor holder, an element storage portion for storing the temperature protection element main body and a plurality of lead wire locking portions for locking the lead wires of the temperature protection element If, to provide molded motor according to claim 1 or 2, characterized in that provided.

According to a fourth aspect of the present invention, the element housing portion is formed with a guide formed to have an elastic force, a plurality of protrusions for pressing the temperature protection element are formed on the guide, and a bottom portion is opened. A molded motor according to claim 3 is provided.

According to a fifth aspect of the present invention, there is provided the molded motor according to any one of the first to fourth aspects, wherein a hole for passing a band or the like is provided in the body portion of the sensor holder.

  With the configuration of claim 1, the sensor holder can be locked and held by forming the protrusion on the inner peripheral side of the stator where the screw hole or the fitting portion cannot be provided. Mounting strength can be increased. In particular, it is suitable for motors used in applications with large vibrations such as motors for washing machines.

Further , it can be fixed more easily than conventional fixing with screws, and since no screw is required, an inexpensive motor can be provided.

With the configuration of the second aspect , the sensor holder can be held more reliably, and in particular, the sensor holder is strong against the displacement of the sensor holder in the circumferential direction.

The structure of claim 3 is a molded motor that covers the stator with a resin, and does not complicate the mold and does not require a holder for various sensors even in a large motor with a large vibration. A motor can be provided.

According to the fourth aspect of the present invention, the temperature protection element can be securely stored, and the temperature of the stator can be detected with high accuracy.

According to the configuration of the fifth aspect , since the lead wire connected to the wiring board can be fixed to the sensor holder, the lead wire is easy to handle, and since it is fixed using a band, the configuration is simple and inexpensive.

The top view of the stator which attached the sensor holder of Example 1 The top view of the sensor holder of Example 1 The perspective view of the back surface of the sensor holder of Example 1 Top view of the stator with the sensor holder of Example 1 removed The perspective view of the stator which attached the sensor holder of Example 1 The top view of the sensor holder of Example 2 The top view of the stator which removed the sensor holder of Example 2

  An embodiment of the present invention will be described with reference to FIGS.

  The stator 1 according to the present invention has a yoke formed in a ring shape and a punched plate in which teeth are formed in the inner circumferential direction. The slot wall between the teeth is insert-molded with an insulating resin. The insulated slot is constituted by winding a winding (not shown).

  As shown in FIG. 1, the stator 1 is covered with a resin frame 2 and formed integrally. Its shape is a donut shape, and a rotor (not shown) is housed on the inner peripheral side. On the outer peripheral side of the stator 1, a flange 3 for mounting to a bracket (not shown) is formed integrally with the resin frame 2, and a mounting hole 4 for mounting a screw is formed in the flange 3.

  In the following description, the stator 1 is entirely covered with resin, but the portion covered with resin may be covered only with the winding portion.

(Shape of sensor holder)
As shown in FIG. 2, the sensor holder 11 includes a storage portion 13 that stores the wiring board 12 and a body portion 14 that is attached to the stator 1. The storage portion 13 is disposed on the inner peripheral side of the trunk portion 14, and the circumferential length of the storage portion 13 is longer than the circumferential length of the trunk portion 14.

  The storage unit 13 is provided with a position sensor 15 and stores a wiring board 12 that matches the shape of the storage unit 13. The stored wiring board 12 is fixed by screwing, and the wiring board 12 and the position sensor 15 are protected by covering the inside of the storage portion 13 with a potting resin.

  From FIG. 3, the outer peripheral surface of the storage portion 13 is in contact with the inner peripheral surface of the stator 1.

  The outer peripheral side of the sensor holder 11 may be formed so as to be screwed to the stator as in the configuration of Patent Document 1, but is fitted downward from the body portion 14 of the sensor holder 11 as in the present invention. A joint portion 17 is provided and is fitted to the outer peripheral side of the stator 1 as will be described later. If the thickness of the fitting portion 17 is about 1 mm to 2 mm, a certain degree of elastic force can be obtained, so that the attachment becomes easier.

(Shape of the stator of the present invention)
As shown in FIG. 4, the stator 1 is entirely covered with a resinous frame 2 except for the tip of the teeth. On the plane side of the stator 1, a mounting portion 5 formed flat so that the sensor holder 11 can be easily mounted is provided. Two protrusions 6 are formed integrally with the resin frame 2 on the inner peripheral side of the stator of the mounting portion 5, and the distance between the two protrusions 6 is provided in accordance with both widths of the sensor holder 11. The lower surface of the protrusion 6 is formed flat.

  A plurality of rectangular recesses 7 are formed between the two protrusions 6, and two protrusions 8 are formed integrally with the resin frame 2 on the outer peripheral side of the stator 1.

(Mounting method of the sensor holder of the present invention)
First, the storage portion 13 of the sensor holder 11 is tilted downward so that the storage portion 13 is placed below the protrusion 6. And the trunk | drum 14 is arrange | positioned so that the resin frame 2 of the stator 1 may be covered, and the said fitting part 17 is fitted to the convex part 8 of a stator outer peripheral part. FIG. 5 is a diagram in which the sensor holder 11 is mounted on the stator 1.

  As a result, both ends of the storage portion 13 of the sensor holder 11 are locked upward by the protrusions 6, the protrusion 16 is fitted into the recess 7 on the outer peripheral surface side of the storage portion 13, and the inner peripheral side is fixed. On the other hand, on the outer peripheral side, the fitting portion 17 is fitted to the convex portion 8 on the outer peripheral portion of the stator. Thereby, the inner peripheral side and the outer peripheral side of the sensor holder 11 are securely fixed and are configured not to easily come off against vibration.

  Further, when removing the sensor holder 11, the sensor holder 11 can be easily detached from the stator 1 by raising the sensor holder 11 slightly obliquely, and can be easily attached and detached when replacement is necessary.

  As shown in FIG. 6, the sensor holder 11 is provided with a temperature protection element 21 for detecting the temperature of the stator 1 and protecting it from a temperature abnormality of the stator 1. An element housing portion 22 is formed to hold the temperature protection element 21.

  The element housing portion 22 is opened in the body portion 14 of the sensor holder 11, and a guide 23 is formed in the opening portion. By making the thickness of the guide 23 about 1 mm, an elastic force is obtained, and a holding force of the temperature protection element 21 is obtained. Further, the bottom of the guide 23 is open, so that the heat from the stator can be reliably detected. Further, a plurality of protrusions 24 are formed on the side wall of the guide 23 so as to press the upper side of the temperature protection element 21.

  In addition, a plurality of lead wire locking portions 25 for locking the lead wires of the temperature protection element 21 are formed in the vicinity of the element housing portion 22. By forming a plurality of the lead wire locking portions 25, various lead wire lengths can be accommodated.

  Furthermore, a lead wire 26 for connecting to the outside is connected to the wiring board 12 in the sensor holder 11. In order to hold the lead wire 26 by the body portion 14 of the sensor holder 11, a lead wire holding portion 27 is provided.

  The lead wire holding portion 27 forms a groove in the body portion 14 of the sensor holder 11 to hold the lead wire 26 and is pressed against the upward movement by a lead wire presser 28 formed integrally with the sensor holder 11.

  Further, the lead wire 26 is held by the sensor holder 11 using a band 29. A band insertion hole 30 for inserting the band 29 is formed in the sensor holder 11.

  As shown in FIG. 7, holes 9 and 10 that are slightly larger than the element housing portion 22 and the band insertion hole 30 are formed in the stator 1, and are recessed downward from the body portion 14 of the sensor holder 11. It is formed so as to fit the storage portion.

  The motor of the embodiment is used for a driving motor for a washing machine, particularly a direct drive system. However, it can also be used in motors for outdoor units of air conditioners, for example, where waterproofness is required.

DESCRIPTION OF SYMBOLS 1 Stator 2 Resin frame 3 Flange 4 Mounting hole 5 Mounting part 6 Protrusion 7 Concave part 8 Protruding part 9, 10 hole 11 Sensor holder 12 Wiring board 13 Storage part 14 Trunk part 15 Position sensor 16 Protrusion part 17 Fitting part 21 Temperature Protective element 22 Element storage portion 23 Guide 24 Projection portion 25 Lead wire locking portion 26 Lead wire 27 Lead wire holding portion 28 Lead retainer 29 Band 30 Band insertion hole

Claims (5)

A stator formed in a substantially circular shape;
A wiring board provided with a position sensor for detecting the rotational position of the rotor;
The storage portion for storing the wiring board and a trunk portion to be attached to the stator, wherein the circumferential length of the storage portion is longer than the circumferential length of the trunk portion, and the storage portion is the trunk portion. A sensor holder integrally formed in an arc shape so as to be arranged on the inner side in the axial direction from the portion;
With
In a molded motor in which a part or the whole of the stator is covered with resin,
A plurality of protrusions are integrally formed of resin on the inner peripheral side and the outer peripheral side of the stator,
A fitting portion is provided on the outer circumferential side of the sensor holder to fit the outer circumferential projection,
A molded motor characterized in that the vicinity of both ends in the circumferential direction of the storage portion of the sensor holder is locked by the inner peripheral projection.
Forming a recess in the inner peripheral edge of the stator,
On the other hand, a convex part is formed in a portion in contact with the inner peripheral side of the stator in the storage part,
Molded motor according to claim 1, wherein the recess and the projection, characterized in that the engagement.
The body portion of the sensor holder is provided with an element storage portion for storing the temperature protection element body and a plurality of lead wire locking portions for locking the lead wires of the temperature protection element. The molded motor according to claim 1 or 2 .
The element storage portion includes a guide formed to have elasticity, a plurality of protrusions for pressing the temperature protection element are formed on the guide, and a bottom portion is opened. 3 mold motor.
The body portion of the sensor holder, the molded motor according to claim 1 to 4, wherein in that a hole into which the band or the like.