JP6081898B2 - motor - Google Patents

Description

  The present invention relates to a motor on which a rotation detector for obtaining rotation information of a rotor is mounted.

  A motor on which a rotation detector for detecting rotation information such as the number of rotations and rotation speed of a rotor (rotating shaft) is mounted is disclosed in, for example, Patent Document 1 and the like. In Patent Document 1, a rotation detector including a detection element such as a Hall element that detects a change in the magnetic field is unitized with respect to a sensor magnet mounted on the rotation shaft so as to rotate integrally with the rotation shaft. It is assembled to.

JP 2003-88047 A

  By the way, in the motor of patent document 1, since it has comprised so that the detection element and sensor magnet of a board | substrate may oppose through the wall of a detector main body (sensor holder), a detection element is made to adjoin to a sensor magnet. It is difficult. In addition, since the detection sensitivity changes depending on the proximity of the detection element to the sensor magnet, it is also a consideration that the position of the detection element can be easily adjusted to obtain a stable detection signal.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to detect rotation with a structure in which the detection element can be brought close to the sensor magnet and the proximity of the detection element to the sensor magnet can be easily adjusted. It is to provide a motor equipped with a device.

A motor that solves the above problems includes a substantially bottomed cylindrical housing in which a rotor is rotatably accommodated, and an end bracket that is fixed so as to close an open end of the housing, and is integrated with the rotor. A rotation detector for detecting rotation information of the rotor that forms a pair with a rotating sensor magnet is mounted on the end bracket, and the rotation detector receives a magnetic field change of the sensor magnet. A substrate on which the detection element is mounted, and a support convex portion is provided on a surface of the detector body facing the sensor magnet so that the detection element side faces the sensor magnet and the support element is mounted on the detection element. and is configured by attached to the convex portion, a plurality of said supporting convex portion is provided on the detector main body, an end surface of the substrate side of the support protrusions base The support surface of each support convex portion is located on the same plane along the axial direction of the rotor, and the substrate contacts the support surface of each support convex portion. The contact protrusions are arranged along the axial direction of the rotor, and the plurality of support protrusions include support protrusions from which terminals electrically connected to the substrate protrude .

  According to this configuration, the rotation detector for detecting the rotation information of the motor (rotor) is such that the detection element side that receives the magnetic field change of the sensor magnet faces the sensor magnet, and the substrate on which the detection element is mounted It is mounted on the surface of the detector body facing the sensor magnet. That is, since the detection element directly faces the sensor magnet, the detection element can be disposed closer to the sensor magnet. In addition, since the substrate on which the detection element is mounted is configured to be mounted on the support convex portion provided on the surface facing the sensor magnet of the detector body, the shape of the entire detector body (the entire rotation detector) can be changed. The degree of proximity of the detection element to the sensor magnet can be easily adjusted simply by adjusting the height dimension of the support convex portion.

In the motor described above, it is preferable that the detection element and various electronic components are mounted on both sides of the substrate.
According to this configuration, since the detection element and various electronic components are mounted on both surfaces of the substrate, the area in the planar direction of the substrate can be reduced, and the rotation detector on which the substrate is mounted can be reduced in size.

  According to the motor of the present invention, in the rotation detector mounted on the motor, the detection element can be close to the sensor magnet, and the proximity of the detection element to the sensor magnet can be easily adjusted.

It is an axial direction sectional view of a motor in one embodiment. It is a top view which shows the end bracket after rotation detector mounting | wearing. It is a top view which shows the end bracket before rotation detector mounting | wearing. It is a perspective view which shows the state which removed various electric components from the end bracket. It is a block diagram of a rotation detector, (a) is an axial sectional view of the rotation detector after mounting the substrate, (b) is an axial sectional view of the rotation detector before mounting the substrate, (c) is after mounting the substrate FIG. 6D is a plan view of the rotation detector before mounting the substrate.

Hereinafter, an embodiment of the motor will be described.
A motor 1 according to this embodiment shown in FIG. 1 is used as a drive source for a power seat device of a vehicle, and tilts each mechanism portion of the seat, for example, a mechanism portion that slides the seat back and forth and a seat backrest portion. This is a DC motor with a brush that is installed in a mechanical unit or the like.

  The motor 1 includes a yoke 2 formed of a magnetic metal material in a substantially bottomed cylindrical shape, and a field magnet 3 is fixed to the inner peripheral surface of the yoke 2. Inside the field magnet 3, an armature 4 is rotatably accommodated. The armature 4 includes a rotating shaft 5, a core 6 fixed to the rotating shaft 5, a winding 7 wound around the core 6, and a tip side of the core 6 (opening end 2 b side of the yoke 2). The commutator 8 is fixed to the rotary shaft 5 and connected to the winding 7, and the sensor magnet 9 is fixed to the rotary shaft 5 further on the tip side than the commutator 8. The armature 4 is rotatably supported by a bearing 10 in which the base end portion of the rotating shaft 5 is held at the bottom center of the yoke 2. The base end portion of the rotating shaft 5 can be connected to a load-side connecting portion via a through hole 2 a formed at the center of the bottom of the yoke 2. An end bracket 11 is fixed to the open end 2b of the yoke 2 so as to substantially close the open end 2b in a state where the armature 4 is accommodated.

  As shown in FIGS. 1 to 4, the end bracket 11 is formed in a predetermined shape with a resin material so as to close the opening end 2 b of the yoke 2. A through hole 11a is formed in the center of the end bracket 11 so as to pass through in the direction of the axis L in order to insert the tip of the rotary shaft 5. The tip of the rotary shaft 5 is held in the through hole 11a. The bearing 12 is rotatably supported. The distal end portion of the rotating shaft 5 can be connected to a load-side connecting portion via the through hole 11 a of the end bracket 11.

  The end bracket 11 protrudes outside the yoke 2 and is fixed to a load side device at each of 180 ° facing positions of the peripheral portion when viewed from the direction of the axis L of the motor 1 (see FIGS. 2 and 3). A fixed portion 11b is formed, and a connector portion 11c is integrally formed so as to protrude from the yoke 2 in the vicinity of the fixed portion 11b on one side. The cross-sectional view of FIG. 1 is a cross section including the connector portion 11c and the other fixing portion 11b. The connector portion 11 c has a cylindrical portion 11 d that forms a substantially rectangular tube shape so that external connectors (both not shown) extending from the control device are fitted along the axis L direction of the motor 1.

  A pair of power supply brushes 13 and 14 are held on the inner side surface of the end bracket 11 so as to be movable in the radial direction on the inner side of the yoke 2 when viewed from the axis L direction. There are provided torsion coil springs 15 and 16 that are biased radially inward so as to be in press contact with the outer peripheral surface of the commutator 8 (see FIG. 1). The power supply brushes 13 and 14 are arranged at a 90 ° interval from each other on the substantially opposite side of the through hole 11a with respect to the connector portion 11c, and a torsion coil is provided in a 90 ° region between the brushes 13 and 14. Springs 15 and 16 are arranged.

  Choke coils 17 and 18 are respectively arranged on the opposite sides of the power supply brushes 13 and 14 from the torsion coil springs 15 and 16, and pigtails 13 a and 14 a extending from the power supply brushes 13 and 14 are respectively connected to the choke coils 17 and 18. Connected to one end. The other ends of the choke coils 17 and 18 are connected to one ends of power supply terminals 19 and 20, respectively. One power supply terminal 19 is connected to a thermistor 21 so as to be interposed. The thermistor 21 has a substantially rectangular plate shape, and is housed in a thermistor housing recess 11e formed in the end bracket 11 so that the flat plate surface faces the axis L direction.

  The power supply terminals 19 and 20 that are separated on both sides of the through hole 11 a of the end bracket 11 gradually approach each other and extend to the connector portion 11 c that protrudes outside the yoke 2. The power supply terminals 19 and 20 are formed of a conductive metal plate, and are disposed along the housing grooves 11f and 11g formed in the end bracket 11 so that the flat plate faces in the direction of the axis L. It is attached by a plurality of locking claws 11h provided at predetermined locations. The other ends of the power supply terminals 19 and 20 are L-shaped and formed as power supply terminal portions 19a and 20a. The power supply terminal portions 19a and 20a are directed in the direction of the axis L in the cylindrical portion 11d of the connector portion 11c. It has been.

  Further, a noise prevention capacitor 22 is connected to the power supply terminals 19 and 20 so as to straddle both. The noise prevention capacitor 22 has a substantially rectangular parallelepiped shape, and a pair of connection terminals 22a and 22b are led out from one side surface thereof. On the other hand, connection slits 19b and 20b that are notched from one side in the width direction and extend in the direction of the axis L when mounted on the end bracket 11 are formed in predetermined portions of the power supply terminals 19 and 20. ing. Further, a detector housing recess 11i for housing a rotation detector 23 described later is provided on the inner side surface of the end bracket 11, and a capacitor further recessed in the direction of the axis L in a part of the housing recess 11i. A housing recess 11j is provided. The capacitor housing recess 11j does not open outside the end bracket 11. The detector housing recess 11 i and the capacitor housing recess 11 j are provided closer to the connector portion 11 c than the through hole 11 a of the end bracket 11 when viewed from the direction of the axis L.

  The noise prevention capacitor 22 is inserted and accommodated in the capacitor accommodating recess 11j from the axis L direction so that the adjacent surface orthogonal to the surface from which the connection terminals 22a and 22b are led is along the axis L direction. The terminals 22a and 22b are press-fitted and fixed in the connection slits 19b and 20b of the power supply terminals 19 and 20, respectively. As a result, the anti-noise capacitor 22 is positioned between the power supply terminals 19 and 20, and the connection terminals 22 a and 22 b of the capacitor 22 are electrically connected to the power supply terminals 19 and 20. In addition, by adopting such a connection mode, the noise prevention capacitor 22 can be automatically assembled.

  A rotation detector 23 for detecting rotation information such as the rotation speed and rotation speed of the motor 1 (armature 4) is attached to the detector receiving recess 11i provided in the end bracket 11. The rotation detector 23 includes a detector main body 23a to which the substrate 25 on which the Hall IC 24a is mounted is fixed, and a terminal holding portion 23b that holds a pair of signal output terminals 26 for outputting detection signals from the Hall IC 24a. And. When the rotation detector 23 is mounted in the detector receiving recess 11i, the substrate 25 is disposed on the detector main body 23a so that the flat surface of the substrate 25 faces the direction of the axis L, and the end bracket 11 is mounted on the yoke 2. In this case, the Hall IC 24a is arranged on the substrate 25 so as to directly face the sensor magnet 9 in the radial direction (see FIG. 1).

  As for the mounting of the substrate 25 on which the Hall IC 24a is mounted on the detector main body 23a, as shown in more detail in FIGS. 5A to 5D, the detector main body 23a has a substrate mounting surface along the axis L direction. 23c, and support convex portions 23d are erected at predetermined three positions on the substrate mounting surface 23c. Each support protrusion 23 d protrudes from the board mounting surface 23 c in the direction perpendicular to the axis L, that is, in a direction close to the sensor magnet 9. The end surface of each support convex portion 23d is a support surface 23e, and is located on the same plane along the axis L direction. And the board | substrate 25 is contact | abutted to the support surface 23e of each support convex part 23d, and is fixed so that the axis line L direction may be followed.

  On the substrate 25, a Hall IC 24a and other electronic components 24b are mounted. The Hall IC 24a is mounted on the one side 25a side of the substrate 25 facing the sensor magnet 9, while the various electronic components 24b are separately mounted on one side 25a and the other side 25b of the substrate 25, and are mounted on both sides. Thus, the size of the substrate 25 is reduced. The substrate 25 (Hall IC 24a and electronic component 24b) is electrically connected to the connection terminal portion 26a of each signal output terminal 26 protruding at the support convex portion 23d. Each signal output terminal 26 is held by insertion or attachment to the terminal holding portion 23b, and the other end protrudes from the terminal holding portion 23b as the output terminal portion 26b.

  In contrast to such a configuration of the rotation detector 23, the detector housing recess 11i is provided with a body housing portion 11i1 for housing the detector body 23a of the rotation detector 23, and the body housing portion 11i1 extends in the axis L direction. A capacitor housing recess 11j is provided continuously. That is, the noise prevention capacitor 22 is arranged on the inner side in the axis L direction of the detector body 23a of the rotation detector 23 (outside in the axis L direction), and the detector body 23a and the noise prevention capacitor 22 of the rotation detector 23 are connected to the axis L. They are arranged side by side in the direction (see FIG. 1). Accordingly, the rotation detector 23 is mounted on the detector receiving recess 11i after the dust-proof capacitor 22 is mounted. When the rotation detector 23 is mounted, the end brackets of the pair of locking claws 23f provided on the rotation detector 23 are mounted. 11 is performed. Incidentally, since the main body housing portion 11i1 and the capacitor housing concave portion 11j of the detector housing recess 11i are located radially inward of the yoke 2, the detector body 23a and the anti-noise capacitor 22 have a diameter larger than that of the yoke 2. Arranged inside the direction.

  When the rotation detector 23 is attached to the detector receiving recess 11i, the other end side of each signal output terminal 26 is positioned in the connector portion 11c, and the other output terminal portion 26b is connected to the connector portion 11c. In the cylindrical portion 11d, the connector portion 11c is constructed by standing in the axis L direction together with the power supply terminal portions 19a and 20a.

  Thus, the motor 1 is completed by mounting and fixing the end bracket 11 on which various electrical components are mounted to the opening end 2b of the yoke 2 in which the armature 4 and the like are accommodated. An external connector extending from the control device is attached to the connector portion 11c and electrically connected to each other, so that drive power from the control device is supplied to the power supply brushes 13 and 14 via the power supply terminal 19. The armature 4 is rotated by being supplied from the brushes 13 and 14 to the winding 7 through the commutator 8. Further, the Hall IC 24a detects a magnetic field change of the sensor magnet 9 based on the rotation of the armature 4 (rotating shaft 5), and the detection signal is output to the control device via the signal output terminal 26. The control device detects rotation information such as the rotation speed and rotation speed of the motor 1 (armature 4) based on the detection signal, controls the drive power source based on the rotation information, and serves as a drive source for the power seat device. 1 rotation control is performed.

Next, characteristic effects of the present embodiment will be described.
(1) A rotation detector 23 for detecting rotation information of the motor 1 (armature 4) is mounted with the Hall IC 24a so that the Hall IC 24a side that receives the magnetic field change of the sensor magnet 9 faces the sensor magnet 9. The substrate 25 is configured to be mounted on the substrate mounting surface 23c (the surface facing the sensor magnet 9) of the detector body 23a. That is, since the Hall IC 24a directly faces the sensor magnet 9, the Hall IC 24a can be disposed closer to the sensor magnet 9.

  Further, since the substrate 25 on which the Hall IC 24a is mounted is configured to be mounted on the support convex portion 23d provided on the substrate mounting surface 23c of the detector main body 23a, the entire detector main body 23a (the entire rotation detector 23) is configured. The degree of proximity of the Hall IC 24a to the sensor magnet 9 can be easily adjusted simply by adjusting the height dimension of the support convex portion 23d without changing the shape.

  (2) Since the Hall IC 24a and various electronic components 24b are mounted on both surfaces of the substrate 25, the area of the substrate 25 in the planar direction can be reduced, contributing to downsizing of the rotation detector 23 on which the substrate 25 is mounted. be able to.

In addition, you may change the said embodiment as follows.
-You may change suitably the shape of the support convex part 23d, the number, and an installation position other than the aspect of FIG.
The substrate 25 is not limited to double-sided mounting, but may be single-sided mounting.

A configuration in which any of the choke coils 17 and 18, the thermistor 21, and the anti-noise capacitor 22 is omitted may be employed.
A configuration using a plurality of Hall ICs 24a may be used.

A magnetic detection element other than the Hall IC 24a may be used.
-You may apply to motors other than a DC motor with a brush.
-You may apply to the motor of uses other than the power seat apparatus of a vehicle.

  DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Yoke (housing), 2b ... Open end, 4 ... Armature (rotor), 9 ... Sensor magnet, 11 ... End bracket, 23 ... Rotation detector, 23a ... Detector main body, 23d ... Support Projection, 24a ... Hall IC (detection element), 25 ... Substrate.

Claims (2)

A substantially bottomed cylindrical housing in which the rotor is rotatably accommodated, and an end bracket fixed so as to close the open end of the housing, are paired with a sensor magnet that rotates integrally with the rotor. A rotation detector for detecting rotation information of the rotor is a motor mounted on the end bracket,
The rotation detector includes a substrate on which a detection element that receives a change in the magnetic field of the sensor magnet is mounted. A support convex portion is provided on a surface of the detector main body facing the sensor magnet, and the detection element side faces the sensor magnet. A substrate on which the detection element is mounted so as to face is configured to be mounted on the support convex portion ,
The detector main body is provided with a plurality of support protrusions, and the end surface of each support protrusion on the substrate side is a support surface of the substrate, and the support surface of each support protrusion is the rotor. Are located on the same plane along the axial direction, and the substrate is disposed so as to be along the axial direction of the rotor in contact with the support surface of each support convex portion,
The motor according to claim 1, wherein the plurality of support protrusions include support protrusions protruding from terminals electrically connected to the substrate . The motor according to claim 1,
The motor, wherein the detection element and various electronic components are mounted on both sides of the substrate.