JP2019134559A - Motor device - Google Patents

Abstract

To provide a motor device capable of stably maintaining a fixed state of a case even when a program needs to be rewritten.SOLUTION: A motor device includes: a motor body; a circuit board 14 in which an element for control in which a program for controlling the motor body is written and a signal terminal 19 electrically connected to the element for control are provided; and a case 15 arranged so as to cover the circuit board 14 and fixed to the motor body by a screw 21. The case 15 is provided with a through-hole 15a at a position facing the signal terminal 19, and a lid portion 22 that can open and close the through-hole 15a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a motor device.

  2. Description of the Related Art Conventionally, a vehicle is provided with various motor devices. The motor device includes a motor main body, a circuit board on which a control element in which a program for controlling the motor main body is written, and the circuit board. There is one provided with a case that is arranged so as to cover and is fixed to the motor body by a screw (for example, see Patent Document 1).

Japanese Patent No. 5848805

  By the way, in the motor device as described above, for example, when it is necessary to rewrite the program of the control element due to a defect or improvement of the product, the case fixed by the screw is removed and provided on the circuit board. The program of the control element is rewritten by bringing the external connection terminal (probe) connected to the rewriting device into contact with the signal terminal.

  However, if the case fixed by the screw is removed as described above, it is difficult to manage the tightening torque when the screw is tightened again, and the fixed state of the case is unstable (compared to the one manufactured at the factory before shipment). There is a risk of becoming. In addition, in the case where the screw is screwed into a hole where the screw groove is not formed at the same time as the molding, and the screw groove is cut and fixed at the same time, once the screw is removed, the same fixed state is obtained even if the screw is fixed again. There is also a problem that the fixed state becomes unstable.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor device that can stably maintain a fixed state of a case even when a program needs to be rewritten. It is to provide.

  A motor device that solves the above problems includes a motor main body, a control element in which a program for controlling the motor main body is written, and a circuit board provided with a signal terminal electrically connected to the control element. A motor device including a case disposed to cover the circuit board and fixed to the motor body by a screw, wherein the case is provided with a through hole at a position facing the signal terminal. In addition, a lid that can open and close the through hole is provided.

  According to this configuration, the case is provided with a through-hole at a position facing the signal terminal of the circuit board, and a lid portion that can open and close the through-hole is provided, so that the case fixed by the screw is removed. Without opening the through hole, an external connection terminal can be connected to the signal terminal. In other words, for example, when it is necessary to rewrite the program due to product defects or improvements, the program can be rewritten by connecting the external connection terminal to the signal terminal with the through hole open, so it is fixed with screws This eliminates the need to remove the case and makes it difficult to manage the tightening torque of the screw. Therefore, even when the program needs to be rewritten, the fixed state of the case can be stably maintained.

In the motor device described above, it is preferable that the case be formed with a positioning recess into which a positioning pin provided integrally with an external connection terminal can be fitted.
According to the same configuration, the case is formed with a positioning recess into which the positioning pin provided integrally with the external connection terminal can be fitted. Therefore, the external connection terminal can be inserted by inserting the positioning pin into the positioning recess. Can be stably contacted (electrically connected) to the signal terminal. In addition, since the convex portion is eliminated compared to the case where the convex portion for positioning is provided on the case, the case can be miniaturized.

In the motor device, it is preferable that the positioning recess is a screw head receiving recess in which the screw is inserted and the head of the screw is received.
According to this configuration, since the positioning recess is a screw head receiving recess in which the screw is inserted and receives the head of the screw, for example, the case is compared with a case where the positioning recess is formed separately from the screw head receiving recess. The shape can be simplified and can be easily molded.

  In the motor device, on the opposite side of the circuit board to the side facing the case, the motor body is fixed, and a motor holder that supports the circuit board is provided. A motor holder side screw hole recessed from the front end surface of the circuit board has a protruding portion that is fitted into a support hole provided in the circuit board and protrudes to the side of the circuit board facing the case. And the case has a cylindrical portion that is externally fitted to the projecting portion and whose front end surface is in contact with the circuit board, and penetrates the bottom portion of the cylindrical portion to the screw hole on the motor holder side. It is preferable to be fixed to the motor holder by the screw screwed into the motor holder.

  According to this configuration, the case is formed by passing through the bottom portion of the cylindrical portion that is externally fitted to the protruding portion that is inserted into the support hole provided in the circuit board, and the screw is screwed into the screw hole on the motor holder side of the protruding portion. Since it is fixed, wobbling of the case with respect to the circuit board can be suppressed.

  The motor device of the present invention can stably maintain the fixed state of the case even when the program needs to be rewritten.

The partial cross section figure of the motor device in one embodiment. The partial cross section schematic diagram of the motor apparatus in one Embodiment. The partial bottom view of the motor apparatus in one Embodiment. The partial cross section schematic diagram of the motor apparatus in another example.

  Hereinafter, an embodiment of a motor device will be described with reference to the drawings. Incidentally, this motor device is an out-rotor type brushless motor used as a blower motor of a vehicle air conditioner.

  As shown in FIG. 1, a stator 2 is fixed to the motor holder 1. The motor holder 1 of the present embodiment includes a holder main body 1 a and a center piece 3, and a stator 2 is fixed to the center piece 3. The stator 2 includes a stator core 4 fixed (supported) to the center piece 3 and a winding 5 wound around the stator core 4.

  The center piece 3 includes a cylindrical portion 3a to which the stator core 4 is fitted and fixed, and a flange portion 3b extending in a flange shape from one end (the lower end in FIG. 1) of the cylindrical portion 3a. The flange portion 3b is the holder body. It is fixed to 1a with a screw 6. Further, in the cylindrical portion 3a of the center piece 3, substantially cylindrical bearings 8 and 9 are respectively fitted and fixed to both ends thereof.

  On the other hand, the rotor 10 that constitutes the motor main body M together with the stator 2 includes a bell-shaped yoke 11, and a plurality (six in this embodiment) of rotor magnets 12 and rotating shafts 13 fixed to the yoke 11. . The rotor magnet 12 is fixed to the inner peripheral surface 11a of the yoke 11 that faces the outer peripheral surface of the stator 2 (at equal angular intervals). The rotary shaft 13 is fixed to the central portion of the yoke 11 and is inserted into shaft support holes 8a and 9a, which are the inner peripheral surfaces of the bearings 8 and 9, and is rotatably supported. Note that a sirocco-type fan (not shown) is fixed to a tip end portion (upper end portion in FIG. 1) protruding outside the rotating shaft 13.

  Further, in the brushless motor of the present embodiment, the circuit board 14 is disposed on the side where the cylindrical portion 3a of the flange portion 3b of the center piece 3 is not formed (the lower side in FIG. 1). It is covered and protected by a case 15 fixed to the motor holder 1. The circuit board 14 has a control element 16 in which a program for controlling the motor body M (that is, supplying an excitation current to the winding 5) is written, and a base end portion of the rotary shaft 13 (in FIG. 1). , A plurality of elements such as a Hall element 18 for detecting the magnetism of the sensor magnet 17 fixed to the lower end portion. The circuit board 14 is provided with a signal terminal 19 (see FIG. 2) electrically connected to the control element 16.

  Here, as schematically shown in FIG. 2, the case 15 is fixed to the motor holder 1 (the holder main body 1 a or the center piece 3) to which the motor main body M is fixed by a screw 21.

  As shown in FIGS. 2 and 3, the case 15 is provided with a through hole 15a at a position facing the signal terminal 19, and a lid portion 22 capable of opening and closing the through hole 15a. Yes.

  Specifically, as shown in FIG. 2, first, the motor body M is fixed on the opposite side of the circuit board 14 to the case 15 and the circuit board 14 is in direct or indirect contact with the circuit board 14. A motor holder 1 that supports the substrate 14 is provided. The motor holder 1 has a substantially cylindrical protrusion 23 that is inserted into a support hole 14 a provided in the circuit board 14 and protrudes to the side (upper side in FIG. 2) facing the case 15 of the circuit board 14. The protrusion 23 has a motor holder side screw hole 23a that is recessed from the front end surface thereof.

  The case 15 has a cylindrical portion 24 that is fitted on the protruding portion 23 and has a tip end surface that comes into contact with the circuit board 14 (that is, sandwiches the circuit board 14 with the motor holder 1). It is fixed to the motor holder 1 by the screw 21 that passes through the bottom 24a of the portion 24 and is screwed into the screw hole 23a on the motor holder side. Further, the bottom portion 24 a of the cylindrical portion 24 is formed at an intermediate position in the axial direction of the cylindrical portion 24, and the cylindrical portion 24 and the bottom portion 24 a are recessed from the outer surface of the case 15 to accommodate the head of the screw 21. The screw head accommodating recess 24b is also configured.

  In the present embodiment, the screw head accommodating recess 24b constitutes a positioning recess into which a positioning pin 32 provided integrally with the external connection terminal 31 can be fitted. Specifically, the motor device of the present embodiment is connected to the signal terminal 19 connected to a rewrite device (not shown) when the program of the control element 16 needs to be rewritten due to product defects or improvements. It is possible to rewrite the program of the control element 16 by electrically connecting the terminal 31. A plurality of connection terminals 31 corresponding to the plurality of signal terminals 19 are held by the resin holder 33, and positioning pins 32 that can be fitted into the screw head housing recesses 24 b constituting the positioning recesses are fixed to the resin holder 33. Yes. A pair of screw head accommodation recesses 24b of the present embodiment are formed at positions sandwiching the through hole 15a, and a pair of positioning pins 32 are also provided corresponding to the pair of screw head accommodation recesses 24b.

As shown in FIG. 3, the lid portion 22 of the present embodiment has a snap fit portion 22 a and can be easily attached to and detached from the case 15.
Next, the operation of the motor device configured as described above will be described.

  In the motor device, the rotation angle of the rotor 10 is detected by detecting the magnetism of the sensor magnet 17 by the Hall element 18, and the power transistor and the like are controlled by the control element 16 based on the detection signal, so that the stator 2 ( An excitation current that generates a rotating magnetic field is supplied to the winding 5). Then, the rotor 10 is rotationally driven, and a fan (not shown) is rotated along with the rotation of the rotor 10 to perform a blowing operation.

  Further, when it is necessary to rewrite the program of the control element 16 due to a product defect or improvement, the motor device removes the lid portion 22 and opens the through hole 15a, and the external through the through hole 15a. The connection terminal 31 is inserted and electrically connected to the signal terminal 19 to rewrite the program of the control element 16. At this time, by inserting the positioning pin 32 into the screw head accommodating recess 24b constituting the positioning recess, the external connection terminal 31 comes into contact with the signal terminal 19 and is electrically connected thereto. Thus, the operator can easily rewrite the program of the control element 16.

Next, the effect of the said embodiment is described below.
(1) Since the case 15 is provided with a through hole 15a at a position facing the signal terminal 19 of the circuit board 14 and a cover portion 22 that can open and close the through hole 15a, the case 15 is fixed by a screw 21. The external connection terminal 31 can be connected to the signal terminal 19 by opening the through hole 15 a without removing the case 15. That is, for example, when it is necessary to rewrite the program due to product defects or improvements, the program can be rewritten by connecting the external connection terminal 31 to the signal terminal 19 with the through hole 15a open. There is no need to remove the case 15 fixed by the screw 21. Therefore, it is not necessary to tighten the screw 21 again, and it is not difficult to manage the tightening torque of the screw 21. Therefore, even when the program needs to be rewritten, the fixed state of the case 15 can be stably maintained. Further, once the screw 21 is removed, the product needs to have marking or the like indicating that it has been removed.

  (2) Since the case 15 is formed with the screw head receiving recess 24b as a positioning recess into which the positioning pin 32 provided integrally with the external connection terminal 31 can be fitted, the positioning pin 32 is inserted into the screw head receiving recess. The external connection terminal 31 can be brought into stable contact (electrically connected) with the signal terminal 19 by being fitted into 24b. Therefore, the program can be rewritten stably. Further, as compared with the case where the positioning projections are provided on the case 15, the projections are eliminated and the case 15 can be downsized.

  (3) Since the positioning recess is the screw head receiving recess 24b in which the screw 21 is inserted and receives the head of the screw 21, for example, the positioning recess of the case 15 is compared with the case where the positioning recess is formed separately from the screw head receiving recess. The shape can be simplified and molding can be easily performed.

  (4) The screw 21 is screwed into the motor holder side screw hole 23a of the projecting portion 23 through the bottom portion 24a of the cylindrical portion 24 that is externally fitted to the projecting portion 23 that is inserted into the support hole 14a provided in the circuit board 14. Since the case 15 is fixed, the wobbling of the case 15 with respect to the circuit board 14 can be suppressed. Therefore, the external connection terminal 31 can be stably contacted (electrically connected) by the signal terminal 19.

  (5) Since the screw head accommodating recesses 24b constituting the positioning recesses are formed in pairs at positions where the through holes 15a are sandwiched (that is, positions where the signal terminals 19 are provided), a pair of positioning pins 32 is provided for each screw head. By fitting in the housing recess 24b, the external connection terminal 31 can be brought into contact with the signal terminal 19 with high accuracy (with little deviation).

The above embodiment may be modified as follows.
In the above embodiment, the case 15 is formed with the screw head accommodating recess 24b that constitutes the positioning recess into which the positioning pin 32 provided integrally with the external connection terminal 31 can be fitted. It is not limited and may be changed to other configurations. For example, the positioning recess may be provided separately from the screw head accommodating recess 24b. Moreover, you may provide the other positioning part (positioning convex part etc.) engaged with the positioning part provided integrally with the external connection terminal 31 in a case. Moreover, it is good also as a structure by which the positioning part is not provided in the case. In this case, for example, the operator manually contacts the position of the external connection terminal (probe) with the position of the signal terminal 19.

  In the above embodiment, the case 15 has the cylindrical portion 24 that is externally fitted to the protruding portion 23 of the motor holder 1. However, the configuration may not include the cylindrical portion 24, and the motor holder 1 may have other configurations. It may be fixed to (motor body M).

For example, as shown in FIG. 4, the tip of the protrusion 23 may be cylindrical, and the screw head receiving recess 24 b and the bottom 24 a may be fixed in a state of being fitted into the cylindrical protrusion 23.
In the above embodiment, a pair of screw head accommodating recesses 24b (positioning recesses) are formed at positions sandwiching the through hole 15a, but the present invention is not limited to this, and may be formed at other positions. Further, the number of screw head accommodating recesses 24b (positioning recesses) may be one, or may be three or more.

  -In above-mentioned embodiment, although the cover part 22 had the snap fit part 22a and was made detachable with respect to the case 15 by this snap fit part 22a, if the through-hole 15a can be opened and closed, It is good also as a cover part of other composition.

The technical idea that can be grasped from the above embodiment will be described below.
(A) The motor device according to claim 2, wherein a pair of the positioning recesses are formed at positions sandwiching the through hole.

  According to the same configuration, the positioning recesses are formed in a pair at a position sandwiching the through hole (i.e., a position sandwiching a position where the signal terminal is provided), and thus by inserting a pair of positioning pins into each positioning recess, The external connection terminal can be brought into contact with the signal terminal with high accuracy (with little deviation).

  DESCRIPTION OF SYMBOLS 1 ... Motor holder, 14 ... Circuit board, 14a ... Support hole, 15 ... Case, 15a ... Through-hole, 16 ... Control element, 19 ... Signal terminal, 21 ... Screw, 22 ... Cover part, 23 ... Projection part, 23a ... Motor holder side screw hole, 24 ... Cylinder part, 24a ... Bottom part, 24b ... Screw head receiving recess (positioning recess), 31 ... Connection terminal, 32 ... Positioning pin, M ... Motor body.

Claims (4)

A motor body;
A circuit board provided with a control element in which a program for controlling the motor body is written and a signal terminal electrically connected to the control element;
A motor device including a case arranged to cover the circuit board and fixed to the motor body by a screw;
The motor device according to claim 1, wherein the case is provided with a through hole at a position facing the signal terminal, and a lid portion capable of opening and closing the through hole.   The motor device according to claim 1, wherein a positioning recess into which a positioning pin provided integrally with an external connection terminal can be fitted is formed in the case.   3. The motor device according to claim 2, wherein the positioning recess is a screw head housing recess into which the screw is inserted to receive a head of the screw. On the opposite side of the circuit board facing the case, the motor body is fixed, and a motor holder for supporting the circuit board is provided,
The motor holder has a protruding portion that is fitted into a support hole provided in the circuit board and protrudes to the side of the circuit board facing the case,
The protrusion has a motor holder side screw hole recessed from the tip surface thereof,
The case has a cylindrical portion that is externally fitted to the projecting portion and whose front end surface is in contact with the circuit board. The case penetrates the bottom of the cylindrical portion and is screwed into the screw hole on the motor holder side. The motor device according to claim 1, wherein the motor device is fixed to the motor holder by the screw.