JPH0684782U - Hall element mounting structure for motor position detection - Google Patents

Abstract

(57) [Abstract] [Purpose] A motor for integrally forming a stator core around which a stator winding is wound and a substrate for rotation speed detection by thermosetting resin. Hall element for position detection mounted on the substrate It is an object of the present invention to provide a hall element mounting structure for detecting a position of an electric motor, which prevents deterioration of thermal reliability of the motor. [Structure] When the stator core and the rotation speed detection board are integrally molded, a protruding piece is erected at the position of the mold corresponding to the mounting position of the position detection Hall element on the board, and the mounting position is thermosetting resin. Not to be covered, and to form a recess for accommodating the Hall element for position detection at a position facing the magnet attached to the rotor, perform integral molding without attaching the Hall element, and By accommodating the Hall element for detection in the same recess and soldering the lead of the Hall element to a predetermined position of the rotation speed detection board, the Hall element can be heated without giving a thermal shock during molding. It is characterized in that it is designed to ensure the reliability of the image.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mounting structure of a hall element for position detection of an electric motor, which is formed by integrally molding a stator with thermosetting resin.

[0002]

[Prior art]

 Conventionally, in a molded motor in which the stator is integrally molded with thermosetting resin, as shown in the figure, the stator winding is wound around the stator core via an insulating winding frame, and With the substrate for rotation speed detection equipped with a Hall element for position detection on the side, it is integrally molded in a bottomed shape with molding resin, and a recess is provided in the center of the inside of the molded stator core to support the shaft. Bearings that support the rotary shaft of the rotor, and the other side of the stator core has a cylindrical hole into which the rotor is inserted to match the inner diameter of the stator core. A circular step recess for press-fitting a steel-made bearing bracket with a bearing fitted in the mouth is formed.The bearing of the bearing and the bearing of the bearing bracket rotatably support the rotor to form an electric motor. There is. When the stator is integrally molded with thermosetting resin, gas spouting from the stator windings, etc., causes bubbles in the molded product.Therefore, the step of molding the stator after heating it to approximately 135 ° C is necessary. In some cases, the heat resistance of the Hall element, which is relatively weak to heat, is reduced, and the reliability is impaired. For this reason, a method has been adopted in which only the wiring board to which the lead wire is attached is molded integrally with the stator, and the board is mounted at a predetermined position after molding. When mounting the board later, it is difficult to position the Hall element with respect to the rotor magnet, which is a bottleneck in operation.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above conventional problems, and a hole for position detection of an electric motor that can be easily positioned by fixing a hall element at a predetermined position of a substrate integrally molded with a stator. The purpose is to provide a device mounting structure.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, a predetermined number of the plurality of support pins protruding from the female die bottom surface of the molding die are erected to match the Hall element mounting portion of the board, and the Hall element is attached to the tip of the support pin. In addition to forming a protrusion that matches the shape and height, a hole for inserting the Hall element is formed in the Hall element mounting portion of the same board, and a terminal portion for soldering the Hall element is formed at a predetermined position on the outer periphery of the hole. In addition, a notch that matches the outer shape of the hall element is formed in the hall element mounting part of the board, and a terminal part to which the hall element is soldered is formed at a predetermined position on the outer periphery of the hall element. On the base of the male die of the molding die that is inserted into the inner diameter of and supports at the prescribed position, a pedestal that supports the board and a protruding piece that protrudes in the outer peripheral direction facing the Hall element mounting part and fits into the notch are formed. I decided to do it. In addition, a Hall element mounting part for mounting the Hall element facing the magnet mounted on one end of the rotor's rotating shaft is formed on the board, and a socket made of heat resistant resin is attached and fixed to the Hall element mounting section. It is placed on one side of the stator core around which the child winding is wound, and is molded integrally with the thermosetting resin into a bottomed one side as a stator.After molding, the Hall element is attached to the socket from the inside of the stator. I put it on.

[0005]

[Action]

 According to the above configuration, the internal constants (3 pieces) of the plurality of support pins protruding from the female die bottom surface of the molding die are arranged in accordance with the Hall element mounting position of the board, and the hole is provided at the tip of the support pin. Form a protrusion of a size that matches the outer shape and height of the element, form a hole for inserting the hall element in the hall element mounting part of the board, and a terminal part for soldering the hall element at a predetermined position on the outer periphery of the hole element. After integrally molding it as a stator, insert the Hall element from the outside through the recess formed by the support pin, bend the terminals of the Hall element at right angles to match the terminals of the board, and through the recess, place the Hall element on the terminals of the board. I try to solder. In addition, a notch that matches the outer shape of the Hall element is formed on the Hall element mounting portion of the board, and a terminal section for soldering the Hall element is formed at a predetermined position on the outer periphery of the notch. A pedestal that supports the board and a protruding piece that protrudes in the outer circumferential direction is formed on the male base to face the Hall element mounting part, and the board is placed on the pedestal of the male base, and the Hall element is mounted on the protruding piece. After aligning the notches of the parts, the stator core was overlaid and integrally molded as a stator, and then the Hall element was soldered to the board from the opening side of the stator. In addition, a ring-shaped magnet is mounted at a predetermined position on one end of the rotor's rotating shaft, and a socket made of heat-resistant resin is mounted at a predetermined position on the substrate facing the magnet, and integrated as a stator on the stator core. After molding, the Hall element was inserted from the inside of the stator into the socket for mounting.

[0006]

【Example】

 Embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 are a side sectional view and an arrow A view of a resin-molded electric motor showing the details of the present invention, in which a stator winding 1 is wound around a stator core 1 via a winding frame 2 made of an insulating material. The rotation speed control board 4, which also functions as a lead wire connection board, is placed on one side of the stator core 1 so as to be supported by the winding frame 2. In that state, the rotation speed control board 4 of the stator core 1 and the rotation speed control board 4 are placed. The outer periphery is integrally molded with thermosetting resin 5 in a bottomed shape on one side, a bearing hole 7 for press-fitting the bearing bearing 6 is provided at the center of the bottom, and the other side of the integrally molded stator 8 is fixed. A hole corresponding to the inner diameter of the child core 1 and a stepped recess 10 into which the bearing bracket 9 is press-fitted and fixed are formed in the opening, the bearing bearing 6 is press-fitted into the bearing hole 7, and the rotor 11 is inserted into the stator core 1. And retain one end of the rotary shaft of the rotor 11 in the bearing bearing 6 of the bearing hole 7 , By inserting a bearing bracket 9 press-fitted bearing bearing 6 to the other end of the rotary shaft, by press-fitting the bearing bracket 9 to the stage recess 10, it forms an electric motor. The rotation speed control board 4 has a hall element notch 14 through which the hall element 13 is inserted in order to face the magnet 12 mounted on the outer periphery of the rotor 11 and mount the hall element 13 for position detection in close proximity. A terminal 15 for soldering the leads of the Hall element 13 is formed on the back surface of the Hall element 13. As shown in FIG. 2, the groove 16 is formed so as not to be covered with the thermosetting resin 5 during the integral molding. Is forming. The rotation speed control board 4 is supported by a plurality of support pins standing upright at a predetermined position on the female bottom of the molding die, and a board positioning hole 17 is formed at the position of the support pin after molding, and the female bottom is further formed. A plurality of pillar-shaped projecting pieces that also serve as support pins are erected at predetermined positions in the column-shaped projecting pieces. A columnar protrusion is formed at a height commensurate with the height of the element 13 to match the hole element notch 14 of the rotation speed control board 4, and after the integral molding, the hall element notch 14 and the terminal portion 15 are formed. After exposing, insert the Hall element 13 facing the magnet 12 of the rotor 11, and form a groove 16 large enough for soldering the leads of the Hall element 13 to the terminals 15. There is.

FIG. 3 and FIG. 4 are side sectional views and B arrow views showing another embodiment of the present invention, showing an example in which the rotation number control board 4 is placed on the bearing bracket side and integrally molded. A recess 18 corresponding to the outer shape and height of the Hall element 13 is formed at a predetermined position concentric with the step recess 10 on the bracket side, and the rotation speed control board 4 is placed on the stator core 1 and integrally molded. Then, the Hall element 13 is inserted to face the magnet 12 of the rotor 11 through the Hall element notch 14 of the rotation speed control board 4, and the lead of the Hall element 13 is connected to the predetermined terminal portion of the rotation speed control board 4. The rotor 11 is soldered to the stator 15, the rotor 11 is inserted into the stator core 1 in this state, and the bearing bracket 9 is press-fitted into the stepped recess 10 to form an electric motor.

FIG. 5 is a side cross-sectional view showing another embodiment. The rotor 11 is attached to the magnet 12 in a ring shape on the rotation shaft on the side opposite to the transmission side, and the predetermined number of rotation speed control boards 4 facing the magnet 12 is provided. Attach the connector 19 made of heat-resistant resin that inserts and holds the lead of the hall element 13 at the position, and fix the rotation speed control board 4 together with the stator core 1 by integral molding in this state, and then connect the hall element 13 to the connector. The rotor 11 is mounted on the stator core 1, the rotor 11 is inserted into the stator core 1, and the Hall element 13 is arranged so as to face the magnet 12 of the rotor 11. As described above, the stator core 1 having the stator windings wound thereon and the rotation speed control board 4 are integrally molded, and then the Hall element 13 is opposed to the magnet 12 of the rotor 11 to control the rotation speed. By mounting the substrate 4 at a predetermined position, it is possible to prevent damage to the hole element 13 due to heat during molding and deterioration of reliability due to heat.

[0009]

[Effect of device]

 As described above, in the present invention, in the electric motor in which the stator is integrally molded with the heat-resistant resin, the Hall element for detecting the magnetic pole position of the electric motor is integrally molded, and then mounted on the substrate, so that the hall The element can be mounted without being subjected to thermal shock when integrally molded, and it is possible to avoid thermal deterioration of the Hall element and ensure reliability.

[Brief description of drawings]

FIG. 1 is a side sectional view of an electric motor showing details of the present invention.

FIG. 2 is a side view seen from the arrow A of the same as above.

FIG. 3 is a side sectional view of an electric motor according to another embodiment of the present invention.

FIG. 4 is a side view of the same as seen from the arrow B.

FIG. 5 is a side sectional view of an electric motor showing another embodiment of the present invention.

FIG. 6 is a side sectional view of a conventional electric motor.

FIG. 7 is a side view of the same as viewed from the direction of arrow C.

[Explanation of symbols]

 1 stator core 2 winding frame 3 stator winding 4 rotation speed control board 5 thermosetting resin 6 bearing bearing 7 bearing hole 8 stator 9 bearing bracket 10 step recess 11 rotor 12 magnet 13 hall element 14 for hall element Notch 15 Terminal 16 Groove 17 Board positioning hole 18 Groove 19 Connector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Yuji Soma 1116 Suenaga, Takatsu-ku, Kawasaki City Inside Fujitsu General Limited

Claims (3)

[Scope of utility model registration request] 1. A substrate is supported on one side of a stator core around which a stator winding is wound by a plurality of support pins protruding from the bottom surface of a female die of a molding die, and the outer periphery is provided on one side with a thermosetting resin. The bottom part is integrally molded, and the bearing part is formed by press-fitting the bearing bearing in the center of the inside of the molded stator.The other side opening of the stator is provided with a step recess for press-fitting and holding the bearing bracket. Insert the rotor with the magnet attached to it, and support one end of the rotary shaft by the bearing bearing of the bearing part. In a motor supporting the above, a predetermined number of the plurality of support pins protruding from the female die bottom surface are erected upright in accordance with the Hall element mounting portion of the board, and the shape of the Hall element is formed at the tip of the support pin. Form a protrusion that matches the height In addition, the hall element mounting part of the same board is provided with a hole for inserting the hall element and a terminal portion for soldering the hall element at a predetermined position on the outer periphery of the hole element mounting portion for detecting the position of the electric motor. Construction. 2. A notch according to the outer shape of the hall element is formed in the hall element mounting portion of the substrate, and a terminal portion for soldering the hall element is formed at a predetermined position on the outer periphery of the notch while the stator winding is wound. On the base of the male die of the molding die that inserts into the inner diameter of the stator core and supports it at a predetermined position, the pedestal that supports the substrate and the protruding piece that protrudes in the outer peripheral direction facing the Hall element mounting portion and fits into the notch A hall element mounting structure for detecting a position of an electric motor, characterized in that: 3. A Hall element mounting portion for mounting a Hall element facing the magnet mounted on one end of a rotary shaft of the rotor is formed on the substrate, and a socket made of a heat-resistant resin is previously formed on the Hall element mounting portion. Mounted and placed on one side of the stator core around which the stator windings are wound, and molded integrally with the thermosetting resin into a bottomed one side as the stator, and after molding, make a hole from the inside of the stator to the socket above. Hall element mounting structure for position detection of an electric motor, characterized by being equipped with an element.