JP5742564B2 - motor - Google Patents

Description

  The present invention relates to a motor including a motor body having terminals disposed on the side surfaces of a bobbin.

  Conventionally, stepping motors are used in devices that require high positioning accuracy and a predetermined rotation angle. For example, as disclosed in Patent Document 1 below, this stepping motor has an electrical pulse as an input as a drive source and outputs a mechanical angle corresponding to the number of pulses.

  This stepping motor has a motor body in which a plurality of terminals to which end portions of coil windings are connected are arranged on the side surface of the bobbin, and a concave shape extending in the axial direction from the opening side to the side surface of the bottomed cylindrical type. A notch is formed, the terminal protrudes outwardly from the notch, the casing for housing the motor body therein, a lid for closing the opening of the casing, and the terminal covering the terminal And a connector cover whose outer peripheral edge is engaged with the edge of the notch and the edge of the lid, and an external connector connected to the terminal via the connector cover. Yes.

  The connector cover is locked by an engaging claw that comes into contact with the inner peripheral surface of the edge in the axial direction of the notch and an engagement piece that comes into contact with the outer peripheral surface of the edge. And the casing includes a contact piece that is contacted along an inner peripheral surface of the edge portion in the circumferential direction of the notch portion, and a fitting portion that is fitted to the edge portion of the lid body. Is attached.

  By the way, in the motors such as the stepping motor, the coil around which the coil winding is wound generates heat by energization during operation. When the energization is cut off, the temperature of the coil portion decreases, and air enters the inside through a gap between the casing that houses the motor body and the connector cover. At this time, if there is condensation in the casing, water is drawn into the motor body by capillary action and negative pressure inside the motor. As a result, only one drop of water enters the gap between the casing and the connector cover, and the water drop advances to the inside of the connector cover, causing the terminals connected to the connector cover to be short-circuited. Will no longer fulfill its function.

For this reason, some drip-proof treatment is required when used in a place where the atmospheric humidity is high and the temperature changes greatly, or in a place where water is likely to adhere from the outside.
Therefore, conventionally, for the purpose of improving the drip-proof property, as shown in FIG. 6, on the entire circumference of the connector cover 40 covering the terminal protruding outward from the notch portion 30 a formed in the casing 30 of the motor 100. The potting material 60 was applied to prevent water from entering the connector cover 40 and the connector 70.

  However, in the conventional method, since the potting material 60 is applied manually, the operator varies the position and amount of application of the potting material 60, and this variation prevents the motor 100. There are problems that the quality of the droplets is lowered and the production efficiency is reduced and the manufacturing cost is increased.

  In addition, due to variations in the potting material 60 to be applied, stable drip-proofness cannot be obtained, and it is necessary to devise the installation location of the motor 100, which becomes a limitation in designing. is there. In addition, since the potting material 60 is applied manually, it tends to adhere to the work table, the lead wires of the external connector, etc., leading to a problem that the working environment is deteriorated and the working efficiency is lowered.

JP-A-9-312963

  The present invention has been made in view of such circumstances, and a potting material is preferably applied to a gap between a casing provided with a motor main body having terminals disposed on the side surfaces of a bobbin and a connector cover covering the terminals. Thus, an object of the present invention is to provide a motor capable of obtaining a good drip-proof property.

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a motor body in which a plurality of terminals to which end portions of coil windings are connected are provided on a side surface of a bobbin, and a bottomed cylindrical type. A concave cutout extending in the axial direction from the opening side is formed on the side surface, the casing protrudes outwardly from the cutout to house the motor body therein, and the opening of the casing is closed. A cover body that covers the terminal and is connected to the terminal, and an outer peripheral edge portion that is connected to the notch and the edge of the lid body, and is connected to the terminal via the connector cover. In the motor provided with the external connector, the connector cover is in contact with the engaging claw that is in contact with the inner peripheral surface of each edge in the axial direction of the notch and the outer peripheral surface of the edge. Locked by the engaging piece Both are engaged with the casing by an abutting piece that is abutted along the inner peripheral surface of the edge in the circumferential direction of the notch and a fitting portion that is fitted to the edge of the lid. When the engagement piece covers the edge in the axial direction of the cutout portion from the outside by contacting the outer peripheral surface side of the edge portion of the cutout portion in the casing. In addition, a space portion that is inserted in the axial direction is formed between the outer surface of the casing, a potting material is filled in the space portion of the engagement piece, and the circumferential direction of the notch portion is one direction. A potting material is applied to the upper surface of the edge and the connection portion of the external connector.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the potting material is a silicon resin.

  According to the first and second aspects of the present invention, the engagement piece provided on the outer peripheral edge portion of the connector cover covering the concave cutout portion formed on the side surface of the bottomed cylindrical casing includes the cutout portion. The casing is covered with a potting material, and a space portion is formed between the outer surface of the casing and the outer surface of the casing, and the space portion is filled with a potting material. The potting material can be reliably applied to the gap between the connector cover and the variation in the amount of the potting material applied. Thereby, working efficiency can be improved and the stable drip-proof property can be obtained.

  In addition, since the potting material can be easily filled in the space portion using a machine such as a dispenser, the potting material is attached to the surface other than the coating portion of the casing and the lead wire of the external connector. The potting material having a low viscosity can be used, and the viscosity of the potting material can be adjusted by changing the size of the space in the radial direction. As a result, the working efficiency of applying the potting material can be improved and the productivity can be increased.

  And since the potting material is applied to the circumferential edge of the notch and the upper surface of the connection portion of the external connector, the dispenser is placed in the space portion inserted in the axial direction. When filling the potting material using, by placing the connecting portion side of the external connector upward and setting it in the dispenser, filling the space portion and the circumferential direction of the notch Application to the edge and the upper surface of the connection portion of the external connector can be easily applied by rotating the motor itself. Thereby, productivity can be improved.

  Furthermore, since the edge of the lid that closes the opening is fitted and engaged with the connector cover on the opening side of the casing, even when moisture such as water droplets is attached to the casing, The moisture can be prevented from entering from the engaging portion. As a result, the potting material to be applied as a drip-proof treatment is applied along the edge of the concave notch, and only applied to the upper surface of the connection portion of the external connector, so that the intrusion of moisture can be achieved. Can be prevented. As a result, the work process can be simplified, good drip-proof properties can be obtained, and the motor can be disposed at various places.

  According to the invention described in claim 2, since the potting material is a silicon resin, the viscosity can be easily adjusted depending on the place where the potting material is injected and the place where the potting material is applied. It can be easily solidified. As a result, workability and productivity can be improved.

1 shows an embodiment of a motor of the present invention, in which (a) is a plan view, (b) is a front view, (c) is a bottom view, and (d) is a right side view. It is AA sectional drawing of Fig.1 (a). It is a perspective view of the connector cover attached to the casing of the motor of the present invention. It is a perspective view which shows the state which attached the connector cover to the casing of the motor of this invention. It is a perspective view which shows the method of apply | coating the potting material to the motor of this invention. It is a front view which shows the state which applied the potting material to the conventional motor.

  As shown in FIGS. 1 and 2, the motor 1 according to the present invention includes a motor body 2 having a plurality of terminals 9 disposed on the side surface of a bobbin 7, and the motor body 2, and has a concave shape on the side surface. A bottomed cylindrical casing 3 in which a notch 3a is formed, a lid 5 for closing the opening of the casing 3, a connector cover 4 engaged with the edge 5a and the notch 3a of the lid 5, An external connector 15 connected to the terminal 9 via the connector cover 4 is schematically provided.

  Here, the motor body 2 is schematically configured by a stator portion 10 and a rotor 11. The stator portion 10 is formed in an annular shape, and a plurality of comb-like pole teeth 12 are formed on the inner peripheral surface, and the respective pole teeth 12 are alternately arranged at equal intervals and combined. Two pairs of field plates 13 constitute two sets of yokes, a bobbin 7 is integrally provided on the outer periphery of the yoke, and a coil winding 8 is wound around the outer periphery of the bobbin 7 to thereby form a multiphase coil. It is composed. A plurality of terminals 9 to which end portions of the coil windings 8 are connected are disposed on the side surface of the bobbin 7 of the stator unit 10.

  A rotor 11 is rotatably provided in the central space of the stator portion 10. The rotor 11 is composed of an output shaft 11a and a permanent magnet 14 that is fixed to the output shaft 11a integrally and that is opposed to a plurality of pole teeth 12 provided on the inner peripheral surface of the stator portion 10 at a minimum interval. It is configured. The permanent magnet 14 is magnetized with magnetic poles whose outer circumferential surfaces are sequentially different in the circumferential direction.

  The casing 3 is formed with a concave notch 3a extending in the axial direction from the side of the opening 3b on the side surface, and the terminal 9 protrudes outward from the notch 3a, so that the motor body 2 is inside. Is stored. In addition, a lid 5 that closes the opening 3b is engaged with and integrally provided with the opening 3b of the casing 3.

  Further, the casing 3 covers the terminal 9 of the motor body 2 and is connected to the terminal 9, and the outer peripheral edge 4 a is engaged with the edge 3 c of the notch 3 a and the edge 5 a of the lid 5. A connector cover 4 is provided. As shown in FIGS. 1 and 3, the connector cover 4 has an outer peripheral edge 4a opposed to an engaging claw 4b that comes into contact with an inner peripheral surface of an edge 3c in the axial direction of the cutout 3a of the casing 3. The engaging piece 4c that is disposed and abuts against the outer peripheral surface of the edge 3c is disposed oppositely and extended.

  In addition, the engagement piece 4c is formed in a substantially square shape in a plan view, and is brought into contact with the outer peripheral surface side of the edge 3c of the notch 3a, whereby each of the notches 3a in the above axial direction. A space portion 4 f that covers the edge portion 3 c and is inserted between the outer surface of the casing 3 in the axial direction is formed. The space 4 f is formed with a notch 4 h on each opening side of the casing 3 in the axial direction. This notch 4h is formed in the side part of the one side contact | abutted by the substantially square-shaped casing 3 in planar view.

  The connector cover 4 is formed with an arcuate contact piece 4d that abuts along the inner peripheral surface of the circumferential edge 3c of the notch 3a of the casing 3. Further, a fitting portion 4e that is fitted to the edge portion 5a of the lid 5 that covers the opening 3b of the casing 3 is formed.

  Further, the connector cover 4 is provided with an external connector 15 connected to the terminal 9 of the motor body 2. The external connector 15 includes an insert portion 15a that is inserted and fitted into the connection portion 4g of the connector cover 4, and a lead wire 15b that is connected from the insert portion 15a to an external device.

With motor 1 structured as above, in order to perform weather resistant by applying a potting material 6, first, as shown in FIG. 5, the dispenser 16 for applying the potting material 6 and sets the motor 1. At this time, the motor 1 sets the closed side of the bottomed cylindrical casing 3 to the upper side.

Next, the potting material 6 is injected from the dispenser 16 into the space 4f formed between the engagement piece 4c on one side of the connector cover 4 and the casing 3 with which the engagement piece 4c is in contact. . At this time, the potting material 6 is made of silicon resin having a viscosity of 400 poise to 300 poise. Therefore, compared with the potting material (viscosity 700 poise) used conventionally, it is easy to flow about 50% in terms of viscosity.
The potting material 6 to be injected into the space 4f can improve the working efficiency by adjusting the viscosity according to the size of the space 4f in the radial direction.

  Further, the engagement piece 4c of the connector cover 4 has a notch 4h formed in the opening in the axial direction of each casing 3 in the space portion 4f, so that the potting material is provided on the edge 3c of the notch 3a of the casing 3. It can be confirmed whether 6 is reliably applied.

  Next, while rotating the motor 1, the potting material 6 is applied to the circumferential edge 3c of the notch 3a, and the potting material 6 is applied to the upper surface of the connecting portion 4g to which the external connector 15 is connected. Apply.

  And after applying the potting material 6 to the connection part of the casing 3 and the connector cover 4, and the upper surface of the connection part 4g of the external connector 15, the potting material 6 is hardened by UV irradiation. Thereby, since the motor 1 can be subjected to a drip-proof treatment, it can be used in a place where the atmospheric humidity is high and the temperature change is large.

  According to the motor according to the above-described embodiment, the engagement piece 4c provided on the outer peripheral edge portion 4a of the connector cover 4 covering the concave cutout portion 3a formed on the side surface of the bottomed cylindrical casing 3 is A space portion 4f that is inserted in the axial direction is formed between the outer edge of the casing 3 and the edge portion 3c in the axial direction of the notch portion 3a. The potting material 6 is filled in the space portion 4f. Therefore, the potting material 6 can be reliably applied to the gap between the casing 3 and the connector cover 4, and variation in the amount of the potting material 6 applied can be reduced. Thereby, working efficiency can be improved and the stable drip-proof property can be obtained.

  Further, since the potting material 6 can be easily filled into the space 4f using a machine such as the dispenser 16, the potting material 6 is provided on the surface other than the coating portion of the casing 3, the lead wire of the external connector 15, and the like. The potting material 6 having a low viscosity can be used, and the viscosity of the potting material 6 can be adjusted by changing the size of the space 4f in the radial direction. As a result, the working efficiency of applying the potting material 6 can be improved and the productivity can be increased.

  Since the potting material 6 is applied to the circumferential edge 3c of the notch 3a and the upper surface of the connection 4g of the external connector 15, the dispenser 16 is inserted into the space 4f inserted in the axial direction. When filling the potting material 6 by using the connector, the connecting portion 4g side of the external connector 15 is arranged on the upper side and set in the dispenser 16, thereby filling the space portion 4f and the circumferential direction of the notch portion 3a. Application to the upper surface of the edge portion 3c and the connection portion 4g of the external connector 15 can be easily applied by rotating the motor 1 itself. Thereby, the potting material 6 can be applied efficiently, and productivity can be improved.

  Furthermore, the opening 3b side of the casing 3 is fitted with and engaged with the connector cover 4 at the edge 5a of the lid 5 that closes the opening 3b, so that moisture such as water droplets is attached to the casing 3. Even in the case of intrusion, it is possible to prevent the moisture from entering from the engaging portion. Thus, the potting material 6 to be applied as a drip-proof treatment is applied along the edge 3c of the concave notch 3a, and is applied only to the upper surface of the connection portion 4g of the external connector 15, so that the intrusion of the moisture can be performed. Can be prevented. As a result, the work process can be simplified, good drip-proof properties can be obtained, and the motor can be disposed at various places.

  Further, since the potting material 6 is a silicon resin, the viscosity can be easily adjusted depending on the place where the potting material 6 is injected or applied, and can be easily solidified by UV irradiation or the like. As a result, workability and productivity can be improved.

  In the above-described embodiment, only the case where a silicon resin is used as the potting material 6 has been described. However, the present invention is not limited to this. For example, a resin containing an epoxy resin or a ceramic binder can be used. .

  The present invention can be used for a motor including a motor body in which terminals are disposed on the side surface of the bobbin.

DESCRIPTION OF SYMBOLS 1 Motor 2 Motor main body 3 Casing 3a Notch part 3b Opening 3c Edge part 4 Connector cover 4a Outer peripheral edge part 4b Engagement claw 4c Engagement piece 4d Contact piece 4e Fitting part 4f Space part 4g Connection part 5 Lid 5a Edge part 6 Potting material 7 Bobbin 8 Coil 8a Coil winding 9 Terminal 15 External connector

Claims (2)

Formed on the side surface of the bobbin is a motor body with a plurality of terminals connected to the ends of the coil windings, and a concave notch extending in the axial direction from the opening side on the bottomed cylindrical side surface A casing that houses the motor body inside by projecting the terminal outward from the notch, a lid that closes the opening of the casing, and the terminal covering the terminal and connected to the terminal, In a motor comprising a connector cover whose outer peripheral edge is engaged with the notch and the edge of the lid, and an external connector connected to the terminal via the connector cover,
The connector cover is locked by an engaging claw that is in contact with the inner peripheral surface of each edge portion in the axial direction of the notch portion, and an engagement piece that is in contact with the outer peripheral surface of the edge portion. And a contact piece that is in contact with the inner peripheral surface of the edge portion in the circumferential direction of the cutout portion and a fitting portion that is fitted to the edge portion of the lid body. Combined
The engagement piece covers the edge in the axial direction of the notch from the outside by contacting the outer edge of the edge of the notch in the casing with the tip thereof . A space portion is formed between the outer surface of the casing and inserted in the axial direction.
The space portion of the engagement piece is filled with a potting material, and the potting material is applied to the circumferential edge of the notch and the upper surface of the connection portion of the external connector. Motor.   The motor according to claim 1, wherein the potting material is silicon resin.

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