JP2009213275A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which eliminates the use of a complicated metal mold, and improves design freedom. <P>SOLUTION: In the motor M having a lid 5 for holding a sensor 11 which is attached to the opening end of a cylindrical case 3 for accommodating a stator 2 at its internal peripheral side, and detects the rotational position of a rotor 6, the motor is characterized in that the lid 5 includes a lid body 5a for holding the sensor 11, a sensor connector 5e which protrudes from the lid body 5a, carries electricity to the sensor 11, and internally includes a connecting terminal 12 for signal extraction, and an electricity carrying connector 5f which protrudes from the lid body 5a, and internally includes a winding electricity carrying terminal 13 for feeding a current to a winding 1 wound around the stator 2. A resin-made sensor assembly 19 which is integrated with the sensor connector 5e, and holds the sensor 11 and the connecting terminal 12 inside, and the winding electricity carrying terminal 13 are integrally resin-molded by insert-molding. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement in a motor.

  In this type of motor, from the viewpoint of improving waterproofness, a case that holds the stator on the inner peripheral side and rotatably supports one end of the rotor, a lid that rotatably supports the other end of the rotor, One having a resolver mount unit interposed between a lid and a case is known.

This resolver mount unit is made of synthetic resin, holds the resolver stator on the inner peripheral side of the insertion hole through which the rotor is inserted, and energizes the terminals that supply current to the winding wound around the stator on the side. The connector and the sensor connector that includes the connection terminals for energization and signal extraction to the resolver stator are provided, and the waterproofness is improved without using the grommet by eliminating the energization and sensor signal cables. (See, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2004-23840

  As described above, conventionally, the waterproof property of the motor can be improved, but the energizing connector and the sensor connector are projected to the side of the resolver mount unit, and the energizing connector and sensor described above are included in the resolver mount unit. When the connector is integrally molded, the shape is complicated, so the mold for resin molding the resolver mount unit, the energizing connector and the sensor connector is also complicated and divided into many parts, which increases the cost required for the mold. .

  Also, depending on the shape of the equipment to which the motor is applied, you may want to install the sensor connector close to the energizing connector, but without using a slide mold that slides from the side to form the energizing connector and sensor connector. However, if such a slide mold is used, the energizing connector and the sensor connector must be installed at a certain distance, so the sensor connector cannot be installed close to the energizing connector, and the design freedom is low. There is a possibility that the mountability of the motor on the device is impaired.

  Therefore, the present invention was devised in order to improve the above-described problems, and the object of the present invention is to provide a motor that does not require the use of a complicated mold and can improve design flexibility. is there.

  In order to achieve the above-described object, the problem-solving means of the present invention includes a lid that is attached to an opening end of a cylindrical case that houses the stator on the inner peripheral side and holds a sensor that detects the rotational position of the rotor. In the motor, the lid includes a lid body that holds the sensor, a sensor connector that includes a connection terminal for energizing the sensor and taking out a signal from the lid body, and a winding that projects from the lid body and is wound around the stator An energizing connector including a coil energizing terminal for supplying a current to the sensor, and a resin sensor assembly that is integrated with the sensor connector and holds the sensor and the connection terminal therein, and the coil energizing terminal by insert molding. It is formed of a resin that is integrated.

  According to the invention of each claim, a sensor assembly that is integrated with the sensor connector and holds the sensor and the connection terminal therein is insert-molded, so that the sensor connector and the current-carrying connector protrude from the side. Since the lid can be molded while avoiding the complexity of the structure of the mold, the manufacturing cost of the motor is reduced.

  Further, by adopting the above configuration, the degree of freedom in setting the mounting positions of the sensor connector and the energizing connector is improved, so that the mountability of the motor to the device is improved.

  Furthermore, since the sensor is embedded in the resin lid, it is possible to prevent water from entering the sensor without using a separate seal, and the waterproofness is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a motor according to an embodiment of the present invention. FIG. 2 is a BB longitudinal sectional view of the motor in one embodiment of the present invention. FIG. 3 is a plan view of the stator. FIG. 4 is a perspective view of the case. FIG. 5 is a diagram for explaining a processing step of injecting resin into the case and molding the stator. FIG. 6 is a perspective view of the stator after resin molding. FIG. 7 is a perspective view of the lid. FIG. 8 is a perspective view of the sensor assembly.

  As shown in FIGS. 1 and 2, the motor M in one embodiment includes a stator 2 around which a winding 1 is wound, a cylindrical case 3 that houses the stator 2 on the inner peripheral side, and a case 3. And a lid 5 that holds a resolver stator 11 that is a sensor that detects a rotational position of the rotor 6, and a rotor 6 that is rotatably supported by the lid 3. .

  The stator 2 will be described in detail below. As shown in FIGS. 2 and 3, the stator 2 includes a cylindrical stator core 7 configured by annularly arranging a plurality of teeth 8, and U wound around each tooth 8. , V, and W phases, and a mold resin 4 that is molded and covers the ends of the windings. The stator core 7 has an outer periphery that extends from the upper end to the lower end in FIG. A groove 7a leading to is provided.

  The illustrated stator core 7 is a 9-slot core including nine teeth 8, and the windings 1 of U, V, and W phases are wound around the teeth 8 in order. A resin insulator 8a is provided on the top and bottom of each tooth 8 in FIG. 2, and each winding 1 is wound from above the insulator 8a. Incidentally, since the stator core 7 is integrated with the mold resin 4, it is not always necessary to fix each of the teeth 8 so as not to be divided. The teeth 8 are arranged in a ring shape and temporarily fixed. You may leave it. Further, the number of slots is not limited to the number described above.

  In addition, although nine grooves 7a are provided as shown in the drawing, the number thereof may be arbitrarily set. However, since the stator core 7 is a divided core, the shape of the teeth 8 is the same. This simplifies the manufacture, and therefore has an advantage of providing the grooves 7a on the back side of all the teeth 8.

  Furthermore, since the groove 7a only needs to be able to form a gap between the case 3 and the stator 2, the shape is also arbitrary. For example, a part of the outer periphery of the stator core 7 is cut off to form a planar groove. Good.

  On the other hand, as shown in FIG. 1, FIG. 2 and FIG. 4, the case 3 has a bottom 3a and a cylindrical portion 3b and is formed in a bottomed cylindrical shape, and a rotor 6 is pivotally supported on the bottom 3a. A concave portion 3c for holding the ball bearing 9 is formed, and on the side portion of the cylindrical portion 3b, nine protrusions 3d projecting toward the inner peripheral side are provided, and a flange 3e is provided at the opening end of the cylindrical portion 3b. Is provided. In addition, the flange 3e is provided with a hole 3f into which a claw 5h provided on the lid 5 described later is inserted, and a mounting hole 3g that allows insertion of a bolt for bolting the motor M to the device.

  Then, the stator 2 is inserted into the case 3 and the stator 2 is fixed to the inner periphery of the cylindrical portion 3b of the case 3 by shrink fitting. At this time, the stator 2 is positioned in the circumferential direction with respect to the case 3 by inserting the protrusion 3 d provided on the case 3 into the groove 7 a provided on the outer periphery of the stator core 7. Moreover, since the said protrusion 3d has entered into the groove | channel 7a, it functions as a rotation prevention to the circumferential direction with respect to the case 3 of the stator 2, and prevents the position shift to the circumferential direction of the stator 2 with respect to the case 3. be able to.

  Subsequently, after fixing the stator core 7 in the case 3 as described above, as shown in FIG. 5, the mold 20 is inserted into the inner periphery of the stator core 7, and the gap R into which the molten mold resin 4 is injected is formed. Form. Further, as shown in FIG. 5, the mold 20 includes a small diameter portion 21 that is inserted into the stator core 7 and contacts the bottom portion 3 a of the case 3, and an inner periphery of the cylindrical portion 3 b of the case 3 that is connected to the small diameter portion 21. A large-diameter portion 22 that is opposed to each other with an annular gap therebetween, and a cylindrical portion 23 that rises from the outer periphery of the large-diameter portion 22 and contacts the outer periphery of the end of the stator core 7.

  Accordingly, by bringing the lower end of the cylindrical portion 23 of the mold 20 into contact with the outer periphery of the end portion of the stator core 7, an annular gap R <b> 1 that accommodates the upper end portion of the winding 1 is formed above the stator core 7. The lower end of the small diameter portion 21 of the mold 20 is brought into contact with the bottom 3 a of the case 3, thereby forming an annular gap R <b> 2 in which the upper end of the winding 1 is accommodated above the stator core 7.

  These gaps R1 and R2 are communicated through a gap between the teeth 8 of the stator core 7 to form one gap R, and the case 3 itself also functions as a mold. The large-diameter portion 22 includes a plurality of resin injection holes 24 that lead to the gap R, and the mold resin 4 can be injected into the gap R from the resin injection holes 24. Furthermore, an annular gap 23 a is provided between the cylindrical portion 23 and the case 3, and the gap R communicates with the outside of the case via a groove 7 a and an annular gap 23 a provided on the outer periphery of the stator core 7. .

  An arbitrary number of convex portions 22a are provided at the lower end of the large diameter portion 22, and a concave portion 4a is formed in the mold resin 4 corresponding to the convex portion 22a as shown in FIG. It has become so. That is, the recess 4 a is provided on the side surface of the lid 5 of the stator 2. The shape of the recess 4a is arbitrary.

  Subsequently, after the mold 20 is inserted into the case 3, the mold resin 4 melted from the resin injection hole 24 is injected into the gap R. When the mold resin 4 injected from the resin injection hole 24 fills the gap R1, it enters the gap R2 through the gap between the teeth 8 of the stator core 7, and then, when cured, the winding 1 wound around the stator core 7 is formed. Covered with the mold resin 4, the stator 2 is completed.

  At the time of this resin injection process, the mold resin 4 enters the gap R1 and is filled into the gap R2 as described above. However, the gap R is exposed to the outside through the groove 7a provided on the outer periphery of the stator core 7. Therefore, the gas generated at the time of resin injection is exhausted out of the case 3 through the groove 7a.

  Further, the mold resin 4 also penetrates into the groove 7a and enters between the ridge 3d and the groove 7a to be hardened. The space between the ridge 3d and the groove 7a is filled and the stator 2 is attached to the case 3. On the other hand, it is possible to prevent the ratchet from rotating and to prevent the stator 2 from coming off from the case 3.

  That is, by forming a groove 7a as a gap between the case 3 and the stator 2, the groove 7a functions as a gas vent hole and is inserted into the case 3 whose one end is completely closed as a bottomed cylindrical shape. The end of the winding 1 wound around the stator core 7 can be covered with the mold resin 4. In other words, since the groove 7a, which is a gap functioning as the gas vent hole, is provided, the case 3 can be formed into a bottomed cylindrical shape.

  Further, the mold resin 4 is injected into the case 3 and hardened in this way, and the mold resin 4 completely covers the winding 1 as shown in FIGS. 2 and 6, and a recess 4a is formed at the lower end. An annular gap A is formed between the outer periphery of the lower end and the cylindrical portion 3 b of the case 3 corresponding to the cylindrical portion 23.

  In this way, even if the winding 1 in the stator 2 is covered with the mold resin 4, the wire ends of the nine windings 1 are assembled together from the mold resin 4 so that the winding 1 can be energized. The end of the wire 1 is protruded.

  Next, as shown in FIGS. 2 and 7, the lid 5 is made of resin, is attached to the opening end of the case 3 and closes the opening end, and the rotor 6 provided on the lid main body 5a. Is inserted into the annular gap A between the mold resin 4 and the case 3, and the mold of the lid main body 5a is inserted into the case 3 side of the lid main body 5a. A convex portion 5d provided at a position corresponding to the concave portion 4a on the side surface of the stator 2 is provided, and an annular bearing seat 18 having a metal cross-section L-shape is mounted in the insertion hole 5b. A ball bearing 10 that supports the rotor 6 is mounted on the circumferential side. The ball bearing 10 can be fixed by the bearing seat 18 without imposing a burden on the lid 5 made of resin.

  Further, the lid body 5 a is cylindrical and holds a metal collar 25 at a position corresponding to the mounting hole 3 g provided in the flange 3 e of the case 3, and the collar 25 is attached to the case 3 on the lid 5. When the is attached, the insertion of a bolt (not shown) that attaches the motor M to the device together with the attachment hole 3g through the attachment hole 3g is allowed. The collar 25 receives a tightening force when the motor M is bolted to the device, and it is possible to avoid an excessive load from acting on the resin forming the lid 5.

  The lid body 5a holds a resolver stator 11 disposed outside the ball bearing 10 and around the insertion hole 5b. The lid main body 5a includes a connection terminal 12 for energizing the resolver stator 11 and extracting signals. The enclosed sensor connector 5e protrudes from the side of the lid body 5a.

  Further, the lid 5 includes a winding energizing terminal 13 for supplying current to the winding 1, and one end of the winding energizing terminal 13 extends into the energizing connector 5f protruding from the side of the lid body 5a. The other end protrudes from the through hole 5g provided at a position avoiding the insertion hole 5b of the lid body 5a so as to face the outside of the motor M.

  Further, the lid body 5a has a plurality of claws 5h raised at positions corresponding to the holes 3f provided in the flange 3e of the case 3. When the claws 5h are inserted into the holes 3f of the case 3, the claws 5h are formed around the holes 3f. The lid 5 can be fixed to the case 3 by being hooked on the case 3.

  In this embodiment, when manufacturing the lid 5 as described above, as shown in FIG. 8, the resolver stator 11 and the connection terminal 12 are held inside by being integrated with the sensor connector 5e. A resin sensor assembly 19 is prepared in advance, and the sensor assembly 19, the coil energizing terminal 13, the bearing seat 18 and the collar 25 are positioned and inserted into a mold (not shown) for molding the lid 5. The parts described above are integrated by insert molding in which molten resin is injected into the mold. That is, the lid 5 is formed of a resin that integrates the respective parts by the insert molding.

  In this manner, the sensor assembly 19 that is integrated with the sensor connector 5e and holds the resolver stator 11 and the connection terminal 12 therein is insert-molded, so that the sensor connector 5e and the current-carrying connector 5f protrude laterally. The lid 5 can be molded while avoiding the complexity of the mold structure.

  Further, in this case, the sensor connector 5e and the energizing connector 5f protrude from the lid body 5a in the radial direction so as to form a predetermined angle in the circumferential direction around the insertion hole 5b, but the predetermined angle should be set small. In addition, the degree of freedom in setting the mounting positions of the sensor connector 5e and the energizing connector 5f is improved, and water can be reliably prevented from entering the resolver stator 11 without using a separate seal.

  When the lid 5 is attached to the case 3, the socket 5c enters the annular gap A, and the convex portion 5d enters the concave portion 4a. The convex portion 5d and the concave portion 4a cause the lid 5 to enter the case 3 in the circumferential direction. Positioned. Thus, the lid 5 is positioned in the circumferential direction in the case 3 by the convex portion 5d and the concave portion 4a. Therefore, even if the claw 5h and the hole 3f are loose, the lid 5 is not loose with respect to the case 3 and is accurate. The resolver stator 11 can be accurately positioned with respect to the stator 2.

  As shown in FIG. 2, a seal ring 14 is attached to the lower end of the socket 5c. The seal ring 14 includes a bent portion at the boundary between the cylindrical portion 3b and the flange 3e of the case 3 and the lid body 5a. Between the case 3 and the lid 5 so as to be sealed.

  Furthermore, the end of the winding 1 wound around each tooth 8 is inserted through the through hole 5g, and the end of the winding 1 and the winding energizing terminal 13 are connected. Can be done.

  Subsequently, the rotor 6 includes a ball bearing 9 held by the case 3 and a shaft 15 supported by a ball bearing 10 held by the lid 5, and a magnet 16 mounted on the outer periphery of the shaft 15 and facing the stator 2. And a resolver rotor 17 that is mounted on the outer periphery of the shaft 15 and faces the resolver stator 11.

  The magnet 16 may be composed of a magnet that is blocked so as to realize a predetermined number of poles, and may be adhered to the outer periphery of the shaft 15, or may be formed in an annular shape and divided and magnetized. It may be a thing.

  As described above, the motor M configured as described above is formed side by side by insert-molding the sensor assembly 19 that is integrated with the sensor connector 5e and holds the resolver stator 11 and the connection terminal 12 therein. Since the cover 5 having a complicated shape from which the sensor connector 5e and the energization connector 5f protrude can be formed while avoiding the complexity of the mold structure, the manufacturing cost of the motor M is reduced.

  Further, by adopting the above configuration, the degree of freedom in setting the mounting positions of the sensor connector 5e and the energizing connector 5f is improved, so that the mountability of the motor M to the device is improved.

  Furthermore, since the resolver stator 11 as a sensor is embedded in the resin lid 5, it is possible to prevent water from entering the resolver stator 11 as a sensor without using a separate seal, and the waterproofness is improved. .

  In addition, since the linear expansion coefficient of the lid 5 and the sensor assembly 19 can be made the same by making the resin in the lid 5 and the sensor assembly 19 the same, no crack is generated at the boundary between the sensor assembly 19 and the lid 5 and the inside of the motor M The prevention of intrusion of water can be made more reliable. Furthermore, although the sensor is the resolver stator 11 as described above, it may be a sensor for detecting magnetism such as a Hall element.

  Apart from this, in this embodiment, the concave portion 4a is provided on the side surface of the lid 5 of the stator 2, and the convex portion 5d corresponding to the concave portion 4a is provided on the side surface of the mold stator 2 of the lid 5, Therefore, the resolver stator 11 integrated with the lid 5 can be accurately positioned with respect to the mold stator 2. That is, the concave portion 4a formed by molding is accurately positioned on the stator core 7. By positioning the resolver stator 11 with respect to the convex portion 5d formed on the lid 5, the convex portion 5d into the concave portion 4a is positioned. Due to the intrusion, the mold stator 2 and the resolver stator 11 are positioned at correct positions.

  Thus, since the relative position of the resolver stator 11 and the mold stator 2 is accurately positioned, it is not necessary to employ a configuration that allows fine adjustment of the mounting position of the resolver stator 11, and at the same time, the resolver stator 11 and the stator 2 Position adjustment work is not necessary, the number of parts of the motor M can be reduced, the assembly of the resolver stator 11 is simplified, and the manufacturing cost of the motor M can be reduced.

  In addition, the motor M is forcibly driven by an external force, for example, an accurate rotational position of the rotor 6 is obtained from the induced voltage of the W layer winding, and the signal output from the resolver stator 11 and the rotor 6 described above are obtained. By calculating a correction amount (correction angle) for obtaining the accurate rotational position of the rotor 6 from the accurate rotational position, and storing the correction amount in the control device in advance, that is, the motor M is electrically corrected. The motor M can be correctly controlled without performing electrical correction work such as correct control.

  In this embodiment, the mold stator 2 is provided with the concave portion 4a and the lid 5 is provided with the convex portion 5d. On the contrary, the mold stator 2 is provided with the convex portion and the lid 5 is provided with the concave portion. May be.

  Further, in the case of the motor M of this embodiment, since the groove 7a which is a gap functioning as the gas vent hole is provided, the case 3 can be formed into a bottomed cylindrical shape, and hence a seal, in this case If the seal ring 14 is installed at one location between the case 3 and the lid 5 on the opening end side of the case 3, the motor M can be waterproofed. This is advantageous in terms of safety and economy.

  In the above description, the groove 2a is provided in the stator 2 so as to form a gas venting gap between the case 3 and the stator 2. However, the groove or recess is not formed on the stator 2 side but on the case 3 side. A gap may be formed by providing a groove, or a groove or a recess may be provided in both the case 3 and the stator 2.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

It is a top view of the motor in one embodiment of the present invention. It is BB longitudinal cross-sectional view of the motor in one embodiment of this invention. It is a top view of a stator. It is a perspective view of a case. It is a figure explaining the process process which inject | pours resin in a case and molds a stator. It is a perspective view of the stator after resin mold processing. It is a perspective view of a lid. It is a perspective view of a sensor assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Winding | winding 2 Stator 3 Case 3a Case bottom 3b Case cylindrical part 3c Case recess 3d Case protrusion 3e Case flange 3f Case hole 3g Case mounting hole 4 Mold resin 4a Mold resin recess 5 Lid 5a Lid Lid main body 5b Lid insertion hole 5c Lid socket 5d Lid convex part 5e Lid sensor connector 5f Lid energizing connector 5g Lid through hole 5h Lid claw 6 Rotor 7 Stator core 7a Groove 8 Teeth 8a Insulator 9, 10 Ball Bearing 11 Resolver stator 12 as sensor 12 Connection terminal 13 Winding energization terminal 14 Seal ring 15 Shaft 16 in rotor 16 Magnet in rotor 17 Resolver rotor 18 in rotor Bearing Cylindrical portion 23a annular clearance 24 resin injection hole 25 in the large diameter portion 22a protrusion 23 mold in the small diameter portion 22 molds in the seat 19 Sensaasshi 20 mold 21 mold color A annular gap M motor R, R1, R2 gap

Claims (4)

In a motor having a lid that is attached to an opening end of a cylindrical case that houses a stator on the inner peripheral side and that holds a sensor that detects the rotational position of the rotor, the lid includes a lid body that holds the sensor, and a lid body A sensor connector including a connection terminal for energization and signal extraction to the sensor protruding from the sensor, and an energization connector including a coil energization terminal protruding from the lid body and supplying a current to the winding wound around the stator. A motor comprising: a resin sensor assembly that is integrated with a sensor connector and holds a sensor and a connection terminal therein; and a resin that integrates a winding energization terminal by insert molding. The motor according to claim 1, wherein a metal bearing seat holding a ball bearing that pivotally supports one end of the rotor is integrated with the lid by insert molding. The motor according to claim 1 or 2, wherein an attachment hole is provided in a flange provided at an opening end of the case, and a cylindrical collar made of metal is integrated at a position corresponding to the attachment hole of the lid by insert molding. 4. The motor according to claim 1, wherein the sensor assembly and the lid are made of the same resin.

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