JP2017158390A - Electric motor control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve downsizing and improvement of heat radiation performance in an electric motor control device.SOLUTION: An electric motor control device 101 includes: a metal substrate 3 on which a driving circuit for driving an electric motor M is mounted; a control board 4 on which a control circuit for controlling the driving circuit is mounted; a housing 1 on which the electric motor M is mounted; a lid body 2 serving as a heat sink; and input/output connectors 7a, 7b which electrically connect an external device with the driving circuit or the control circuit. The metal substrate 3 and the control board 4 are stored in a storage space K formed by the lid body 2 engaging with a side of the housing 1 which is opposite to the electric motor M. The lid body 2 has a connection surface 2d which thermally connects heating electronic components 32 included in the driving circuit through the metal substrate 3. The connection surface 2d is arranged in parallel to a rotary shaft J of the electric motor M.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a structure of an electric motor control device that controls driving of an electric motor.

  For example, an electric power steering system mounted on a vehicle is provided with an electric motor control device that controls driving of the electric motor. For example, as disclosed in Patent Documents 1 to 5, the electric motor control device includes a drive circuit for driving the electric motor, a control circuit for controlling the drive circuit, and an input for electrically connecting to an external device. An output connector and a housing or a lid for storing at least the circuit are provided.

  In vehicles such as automobiles, various electronic devices and electronic components are mounted in addition to a traveling system such as an engine. In order to reduce the weight and size of the vehicle, the electric motor control device included in the electric power steering system is required to be downsized. Further, since the driving circuit of the electric motor includes a heat generating electronic component having a large heat generation amount, a countermeasure for radiating the heat generated by the heat generating electronic component is also required.

  Therefore, in Patent Document 1, the drive circuit is built in the power module, the control circuit is mounted on the control board, and the input / output connector is mounted on the input / output board. The housing is composed of a case and a cover formed of a conductive metal material. A power module, a control board, and an input / output board are housed in a housing space formed by engaging the case and the cover. The side wall portion of the case is inclined at an acute angle with respect to the cover. The sealing member of the power module is directly or indirectly connected to the side wall, and the input / output connector is exposed outward from the side wall. An electric motor is attached to the opposite side of the cover case. The input / output board and the control board are fixed to the cover and the case so as to face each other at a predetermined interval in a posture perpendicular to the rotation axis of the electric motor.

  In Patent Document 2, a part of a drive circuit is built in a semiconductor module, and a control circuit is mounted on a control board. An electric motor is mounted on one side of the motor case. A convex heat sink is integrally provided on the other side of the motor case opposite to the electric motor with respect to the axial direction of the rotating shaft of the electric motor. A storage space is formed by engaging the cover with the other side of the motor case, and a semiconductor module, a control board, a heat sink, and the like are stored in the storage space. The heat sink has a plurality of side wall surfaces provided upright around the rotation shaft of the electric motor. Each side wall surface is parallel to the rotation axis of the electric motor and faces the opposite side to the rotation axis. The semiconductor modules are thermally connected to the two or more side wall surfaces, respectively. The control board is disposed on the opposite side of the heat sink to the electric motor in a posture perpendicular to the rotation axis of the electric motor.

  In Patent Document 3, a drive circuit is mounted on a first substrate, and a control circuit is mounted on a second substrate. An electric motor is mounted on one side of the motor cover. The first substrate is disposed inside the relay member in a posture perpendicular to the rotation axis of the electric motor, and is fixed to the inner surface of the unit cover together with the relay member. One surface of the first substrate on which the drive circuit is not mounted is in contact with the inner surface of the unit cover. The second substrate is fixed on the opposite side of the relay member from the unit cover in a posture perpendicular to the rotation axis of the electric motor. A storage space is formed by engaging the unit cover with the other side of the motor cover, and the two substrates and the relay member are stored in the storage space. An input / output connector is integrally projected on the peripheral surface of the relay member.

  In Patent Document 4, a drive circuit is built in a power module, and a control circuit is mounted on a control board. The outer surface of the power module that does not face the control board is thermally connected to a heat sink via a heat conducting member. The control board is fixed to the motor cover so that one surface of the control board on the side opposite to the power module is in contact with the upper surface of the motor cover. By holding the heat sink between the motor cover and the connector case, a storage space is formed between the motor cover and the heat sink, and a control board, a power module, and the like are stored in the storage space. An input / output connector is integrally projected on the outer surface of the connector case opposite to the motor cover.

  In Patent Document 5, a part of the drive circuit is mounted on three power boards, and the control circuit is mounted on the control board. Each power substrate is formed of a multilayer substrate having a circuit formed on one side. The multilayer substrate includes a high thermal conductive plate (such as an aluminum plate) in surface contact with a thick portion serving as a heat sink. An electric motor is mounted on one side of the housing case. In the storage space provided on the other side of the housing case, each power board and the control board are stored. Each power board is arranged around the rotation axis of the electric motor in parallel with the rotation axis. The control board is disposed in a posture perpendicular to the rotation axis of the electric motor.

  In the electric motor control device, the heat generating electronic component included in the drive circuit includes a switching element such as an FET. In general, the switching elements are installed more than the semiconductor elements such as CPUs included in the control circuit, and the mounting occupation area is wide. For this reason, as in Patent Document 3 and Patent Document 4, the switching element is directly or thermally connected to the wall surface of the lid or heat sink, which is also used as a heat sink, perpendicular to the rotation axis of the electric motor. When connecting to the wall, the wall must be wide. For this reason, a cover or a heat sink becomes large in the direction (side) perpendicular to the rotation axis of the electric motor, which may hinder downsizing of the electric motor control device.

  In addition, since the electric motor generates a large amount of heat, if a heat generating electronic component included in the drive circuit is thermally connected in the vicinity of the electric motor of the housing as in Patent Document 2, the influence of the heat generated by the electric motor is affected. The heat generated by the heat-generating electronic component may not be efficiently dissipated.

JP2015-113071 JP 2014-57514 A JP 2014-189166 A JP2015-134598A JP 2012-245848 A

  The subject of this invention is providing the electric motor control apparatus which can implement | achieve size reduction and the improvement of heat dissipation.

  An electric motor control device according to the present invention includes a drive circuit that drives an electric motor, a control circuit that controls the drive circuit, a housing on which the electric motor is mounted, a lid that also serves as a heat sink, and a drive circuit or control circuit. And an input / output connector for electrically connecting an external device. A drive circuit and a control circuit are housed in a housing space formed by engaging a lid on the opposite side of the housing from the electric motor. The lid has a connection surface for thermally connecting heat-generating electronic components included in the drive circuit, and the connection surface is parallel to the rotating shaft of the electric motor.

  According to the said structure, the connection surface which thermally connects the heat-generating electronic component contained in a drive circuit is provided in the cover body in parallel with the rotating shaft of the electric motor. For this reason, even if the number of heat generating electronic components is large or the mounting occupation area is large, there is no need to expand the lid in a direction (side) perpendicular to the rotation axis of the electric motor. Can be miniaturized. Moreover, the heat generating electronic component is thermally connected not to the housing in which the electric motor is mounted, but to the connection surface of the lid body away from the electric motor. For this reason, it is possible to efficiently dissipate the heat generated by the heat generating electronic components to the outside by the lid that also serves as the heat sink without being affected by the heat generated by the electric motor, thereby improving the heat dissipation.

  In the present invention, in the electric motor control device, the drive circuit is mounted on one surface of the metal substrate, the other surface of the metal substrate is a metal surface, and the metal surface is in contact with the connection surface. May be fixed to the lid.

  According to the present invention, in the electric motor control device, the lid further includes an internal fin protruding into the storage space, and a side surface parallel to the rotation axis of the electric motor of the internal fin is a connection surface. Also good. Further, the internal fins may be provided so as to extend in the radial direction of the lid through the center of the lid.

  According to the present invention, in the electric motor control device, the lid further has an external fin protruding from an outer surface not facing the housing, and the input / output connector is parallel to the external fin and has a predetermined interval. In this case, the outer surface of the housing may protrude.

  Alternatively, according to the present invention, in the above electric motor control device, the lid body is provided with an external fin protruding from an outer surface not facing the casing, and a concave fitting portion provided inside the external fin and opening to face the storage space. And the inner surface parallel to the rotation axis of the electric motor of the fitting portion may be a connection surface. The external fins may be provided so as to extend in the radial direction of the lid through the center of the lid. Furthermore, the input / output connector may protrude from the outer surface of the housing in parallel to the external fin and at a predetermined interval.

  In the present invention, in the electric motor control device, the heat generating electronic component may include a switching element, and the outer surface of the sealing portion of the switching element may be brought into contact with the connection surface of the lid so that heat is transmitted.

  Further, according to the present invention, in the electric motor control device, the control circuit is mounted on a control board formed of a printed circuit board, and the control board is in a posture perpendicular to the rotation axis of the electric motor and is more electric than the drive circuit. It may be arranged on the side. Moreover, you may further provide the rotation sensor mounted in a control board so as to oppose the rotating shaft of an electric motor, and detecting rotation of this rotating shaft.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the electric motor control apparatus which can implement | achieve size reduction and the improvement of heat dissipation.

1 is an exploded perspective view of an electric motor control device according to a first embodiment of the present invention. It is an assembly perspective view of the electric motor control device of FIG. It is a top view of the electric motor control apparatus of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a disassembled perspective view of the electric motor control apparatus by 2nd Embodiment of this invention. FIG. 7 is an assembled perspective view of the electric motor control device of FIG. 6. It is a top view of the electric motor control apparatus of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is sectional drawing of the electric motor control apparatus by 3rd Embodiment of this invention. It is sectional drawing of the electric motor control apparatus by 4th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  First, the structure of the electric motor control device 101 according to the first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an exploded perspective view of the electric motor control device 101. FIG. 2 is an assembled perspective view of the electric motor control device 101. FIG. 3 is a plan view of the electric motor control device 101. 4 is a cross-sectional view taken along line AA in FIG. 5 is a cross-sectional view taken along the line BB in FIG.

  The electric motor control device 101 is incorporated in the electric power steering system, and controls driving of the electric motor M (FIG. 4) in order to assist the steering of the vehicle. The same applies to electric motor control devices 102 to 104 of other embodiments described later.

  As shown in FIG. 1, the electric motor control device 101 includes a housing 1, a lid 2, a metal substrate 3, a control substrate 4, and input / output connectors 7a and 7b.

  The housing 1 is made of a metal having high thermal conductivity and is formed in a cylindrical shape. As shown in FIGS. 4 and 5, the electric motor M is mounted on the mounting portion 1 b on one side of the housing 1. The rotation axis J of the electric motor M coincides with the central axis of the housing 1.

  A housing portion 1 a is provided on the opposite side of the housing 1 from the electric motor M with respect to the axial direction of the rotating shaft J of the electric motor M. Through-holes 1e and 1f are formed in the partition wall 1d that separates the storage portion 1a and the mounting portion 1b (FIGS. 4 and 1). A through hole 1c is formed at the tip of the mounting portion 1b (FIG. 4). One end portion of the rotating shaft J of the electric motor M protrudes to the outside through the through hole 1c, and the other end portion of the rotating shaft J protrudes to the housing portion 1a through the through hole 1e. Further, the motor terminal Mt protrudes through the through hole 1f in the housing portion 1a (FIG. 1).

  The lid 2 is made of a metal with high thermal conductivity, and as shown in FIG. 3, the main body 2a is formed in a substantially circular shape in plan view. As shown in FIGS. 4 and 5, the lid body 2 is engaged with the other end portion of the housing 1 so as to close the storage portion 1 a, and the lid body 2 and the ear portion 2 q of the housing 1. 1q (FIGS. 1 to 3) are fixed with screws or the like. In this engaged state, a storage space K closed by the housing 1 and the lid body 2 is formed. In the storage space K, the metal substrate 3 and the control substrate 4 are stored. A sealing material (not shown) is sandwiched between the engagement portions of the housing 1 and the lid 2.

  The lid 2 has an internal fin 2b and an external fin 2c. As shown in FIGS. 4 and 5, the internal fin 2 b protrudes from the inner surface of the main body 2 a facing the housing 1 to the storage space K. The external fin 2 c protrudes from the outer surface of the main body 2 a that does not face the housing 1 to the side opposite to the electric motor M.

  The internal fin 2b and the external fin 2c are provided so as to extend in the radial direction of the main body 2a through the center of the main body 2a of the lid 2. The width in the radial direction of each fin 2b, 2c is set within a range equal to or smaller than the diameter of the main body 2a. That is, each fin 2b, 2c is formed so as not to protrude in the radial direction (side) from the main body 2a.

  Further, the internal fin 2 b and the external fin 2 c protrude parallel to the rotation axis J of the electric motor M. Further, the internal fin 2b and the external fin 2c are continuous via the main body 2a. The lid 2 also serves as a heat sink.

  The metal substrate 3 is made of a metal plate such as aluminum. One surface 3a of the metal substrate 3 is insulated. A drive circuit 31 for driving the electric motor M is mounted on the one surface 3a as shown in FIGS. The drive circuit 31 includes a heat generating electronic component 32 that generates a large amount of heat when energized. The heat generating electronic component 32 is formed of a switching element such as an FET (field effect transistor). In addition, the drive circuit 31 includes electronic components such as a capacitor, a coil, and a resistor (detailed illustration is omitted).

  The other surface 3b (FIG. 4) of the metal substrate 3 is a metal surface that is not insulated. The drive circuit 31 is not mounted on the metal surface 3b. Moreover, in the example of FIG. 4, no electronic component is mounted on the metal surface 3b, and no electric circuit is formed.

  One side surface 2 d (FIG. 1) having the largest surface area of the internal fin 2 b of the lid 2 is a connection surface for thermally connecting the heat generating electronic components 32 on the metal substrate 3. As shown in FIG. 4, the connection surface 2 d is parallel to the rotation axis J of the electric motor M.

  The metal substrate 3 is fixed to the lid 2 with screws or the like so that the metal surface 3b of the metal substrate 3 is in contact with the connection surface 2d. Thereby, the heat generating electronic component 32 is thermally connected to the internal fin 2 b of the lid body 2 through the metal substrate 3. An insulating heat conductive sheet may be interposed between the metal surface 3b and the connection surface 2d.

  A base portion of the motor connection terminal 6 is mounted on one surface 3 a of the metal substrate 3. The front end of the motor connection terminal 6 is connected to the motor terminal Mt in the storage space K by welding or the like. Thereby, the drive circuit 31 of the metal substrate 3 and the electric motor M are electrically connected. Connection work between the motor connection terminal 6 and the motor terminal Mt is performed through an opening 1k (FIG. 1) provided on the peripheral surface of the housing 1. The opening 1k is closed by the cap 13. The cap 13 is fixed to the peripheral surface of the housing 1 with screws or the like.

  The control board 4 is a printed board or the like. A control circuit 41 that controls the drive circuit 31 is mounted on the control board 4. The control circuit 41 includes a CPU, a memory, and the like (detailed illustration is omitted). The external shape of the electronic component included in the drive circuit 31 is larger than the external shape of the electronic component included in the control circuit 41.

  As shown in FIGS. 4 and 5, the control board 4 is positioned at a position perpendicular to the rotation axis J of the electric motor M and closer to the electric motor M than the metal board 3 on which the drive circuit 31 is mounted. Further, the lid 2 is fixed. Specifically, the control board 4 is fixed to the tips of the internal fins 2b of the lid body 2 with screws or the like.

  A rotation sensor 8 is mounted on the surface 4 a of the control board 4 that does not face the lid 2 so as to face the rotation axis J of the electric motor M. The rotation sensor 8 is a magnetic sensor. A magnet 11 is embedded in the other end of the rotating shaft J protruding into the storage space K. The rotation sensor 8 detects the rotation of the rotating shaft J of the electric motor M based on the change in the magnetic field of the magnet 11.

  The base portion of the substrate connection terminal 5 is mounted on one surface 3 a of the metal substrate 3. The tip of the board connection terminal 5 is connected to the control board 4 in the storage space K, as shown in FIG. Specifically, the tip end portion of the board connection terminal 5 is inserted into a through hole 4h (FIG. 1) formed in the control board 4 and connected by a metal such as solder or copper. Thereby, the drive circuit 31 of the metal substrate 3 and the control circuit 41 of the control substrate 4 are electrically connected. In the storage space K, the metal substrate 3 is perpendicular to the control substrate 4.

  The input / output connectors 7 a and 7 b electrically connect an external device (not shown) to the drive circuit 31 or the control circuit 41. Of these, one input / output connector 7a is a power connector for supplying power from a vehicle battery (not shown). The other input / output connector 7b is a signal connector for transmitting and receiving signals to a vehicle-side ECU (electronic control unit) (not shown).

  The input / output connectors 7a and 7b are provided on the outer surface of the main body 2a of the lid 2 so as to protrude in parallel with the external fins 2c. Specifically, the power connector 7a is provided at a predetermined interval from the external fin 2c on one side of the external fin 2c. A signal connector 7b is provided on the other side of the external fin 2c with a predetermined distance from the external fin 2c. The housings 7c and 7d of the input / output connectors 7a and 7b are respectively fitted into through holes 2e and 2f formed in the main body 2a from the inside facing the housing 1, and the peripheral portions of the through holes 2e and 2f. It is fixed with screws.

  The fitting portions 7g and 7h of the input / output connectors 7a and 7b protrude from the main body 2a of the lid 2 to the opposite side of the electric motor M. A harness connected to an external device (not shown) is inserted into and removed from the fitting portions 7g and 7h of the input / output connectors 7a and 7b in parallel with the rotation axis J of the electric motor M.

  The upper end portions of the terminals 7e and 7f of the input / output connectors 7a and 7b protrude into the fitting portions 7g and 7h, respectively. The lower ends of the terminals 7e and 7f penetrate the housings 7c and 7d, respectively, and protrude into the storage space K.

  The lower end portion of the terminal 7e of the power connector 7a is connected to the external connection terminal 9 mounted on the metal substrate 3 by welding or the like. Thereby, the power connector 7a and the drive circuit 31 on the metal substrate 3 are electrically connected. Then, a harness connected to a battery (not shown) is fitted to the fitting portion 7g of the power connector 7a, whereby the battery and the drive circuit 31 of the metal substrate 3 are electrically connected. It becomes possible to supply power.

  The lower end of the terminal 7 f of the signal connector 7 b is connected to the control board 4. Specifically, the lower end of the terminal 7f is inserted into a through hole 4i (FIG. 1) formed in the control board 4 and connected by a metal such as solder or copper. Thereby, the signal connector 7b and the control circuit 41 on the control board 4 are electrically connected. And the vehicle side ECU and the control circuit 41 of the control board 4 are electrically connected by fitting the harness connected to the vehicle side ECU (not shown) to the fitting portion 7h of the signal connector 7b, and the vehicle Signals can be transmitted and received between the side ECU and the control circuit 41.

  In addition to the above, the storage space K closed by the housing 1 and the lid body 2 stores electrical circuits and electronic components such as filter circuits composed of coils and capacitors. These electric circuits and electronic components are fixed to the casing 1 or the lid 2 directly or indirectly through a substrate, a relay member, or the like.

  According to the first embodiment, the heat generating electronic component 32 included in the drive circuit 31 is thermally connected to the connection surface 2d of the lid 2 that also serves as a heat sink, and the connection surface 2d rotates the electric motor M. It is parallel to the axis J. Therefore, even if the number of heat generating electronic components 32 is large or the mounting occupation area is large, it is not necessary to expand the lid 2 in the direction (side) perpendicular to the rotation axis J of the electric motor M. The electric motor control device 101 can be reduced in size. In addition, the heat generating electronic component 32 is thermally connected to the connection surface 2d of the lid 2 away from the electric motor M, not the housing 1 in which the electric motor M is mounted. For this reason, without being affected by the heat generated by the electric motor M, the heat generated by the heat generating electronic component 32 can be efficiently radiated to the outside by the lid body 2 to improve the heat dissipation.

  In the first embodiment, the metal substrate 3 is mounted such that the drive circuit 31 is mounted on the one surface 3 a of the metal substrate 3 and the other metal surface 3 b of the metal substrate 3 is in contact with the connection surface 2 d of the lid 2. Is fixed to the lid 2. For this reason, the heat generated in the heat generating electronic component 32 included in the drive circuit 31 is efficiently transmitted from the connection surface 2d to the lid 2 via the metal substrate 3, and the heat is efficiently radiated from the lid 2 to the outside. can do.

  In the first embodiment, the connection surface 2 d to which the heat generating electronic component 32 is thermally connected is one side surface of the internal fin 2 b of the lid body 2 that protrudes into the storage space K. For this reason, the heat generated in the heat generating electronic component 32 can be transmitted to the internal fins 2b of the lid 2 via the metal substrate 3 and radiated to the periphery of the internal fins 2b. Further, the heat transmitted from the heat generating electronic component 32 to the internal fin 2b can be transmitted to the main body 2a of the lid 2 and radiated from the main body 2a to the outside. Moreover, since the surface area of the cover body 2 increases by providing the internal fin 2b, the heat dissipation by the cover body 2 can be improved more.

  Moreover, in the said 1st Embodiment, the internal fin 2b is provided so that it may pass through the center part of the main-body part 2a of the cover body 2, and may extend in the radial direction of the main-body part 2a. For this reason, it is possible to increase the area of the connection surface 2d by increasing the radial width of the internal fin 2b within a range equal to or smaller than the diameter of the main body 2a. Thereby, the heat generating electronic component 32 or the metal substrate 3 on which the heat generating electronic component 32 is mounted can be easily thermally connected to the connection surface 2d, and the heat dissipation by the lid 2 can be improved.

  If the internal fin 2b protrudes in the radial direction (side direction) from the main body 2a of the lid 2, the lid 2 and the housing 1 become large in the radial direction, and the electric motor control device 101 is enlarged. End up. However, in the first embodiment, since the internal fins 2b are formed so as not to protrude in the radial direction from the main body 2a, the lid 2 and the housing 1 do not increase in the radial direction, and the electric motor control is performed. It is possible to prevent the apparatus 101 from becoming large.

  Moreover, in the said 1st Embodiment, the external fin 2c which protrudes on the outer surface of the main-body part 2a of the cover body 2 to the opposite side to the electric motor M is provided. For this reason, the heat transmitted from the heat generating electronic component 32 to the main body 2a via the internal fin 2b can be transmitted from the main body 2a to the external fin 2c and radiated from the external fin 2c to the outside. Moreover, since the surface area of the cover body 2 increases by providing the external fin 2c, the heat dissipation by the cover body 2 can be further improved. However, since the external fin 2c is provided so as to extend in the radial direction of the main body 2a through the central portion of the main body 2a of the lid 2, the radial width of the external fin 2c is set to the main body 2a. The heat dissipation by the lid 2 can be further improved by increasing the size within the range of 2a or less. Further, the lid 2 and the housing 1 are not enlarged in the radial direction, and the electric motor control device 101 can be downsized.

  In the first embodiment, the input / output connectors 7a and 7b protrude from the outer fin 2c at a predetermined interval on the outer surface of the lid 2 that does not face the housing 1. For this reason, for example, as in Patent Document 1 and Patent Document 3, the input / output connectors 7a and 7b are connected to the electric motor M or the electric motor control device 101 in the case where the input / output connectors are protruded to the sides of the housing and the lid. It can be arranged close to the center side. Accordingly, the lid body 2, the casing 1, and the control board 4 can be reduced in size, and the electric motor control device 101 itself can be reduced in size. Further, the fitting portions 7g and 7h of the input / output connectors 7a and 7b are directed to the side opposite to the electric motor M. For this reason, when the harness connected to the external device is fitted or removed from the fitting portions 7g and 7h, the electric motor M and the external fin 2c do not get in the way, and the fitting and removal work can be easily performed. it can.

  Furthermore, in the first embodiment, the control board 4 on which the control circuit 41 is mounted is in a posture perpendicular to the rotation axis J of the electric motor M and is closer to the electric motor M than the metal board 3 on which the drive circuit 31 is mounted. It fixes to the front-end | tip of the internal fin 2b of the cover body 2 so that it may be located in. A rotation sensor 8 is mounted on one surface 4a of the control board 4 that does not face the lid 2. For this reason, it is possible to detect the rotation of the rotation axis J by making the rotation sensor 8 face the rotation axis J of the electric motor M. In addition, since the control circuit 41 and the rotation sensor 8 are mounted on one control board 4, the storage space K can be reduced as compared with the case where the control circuit 41 and the rotation sensor 8 are distributed and mounted on separate boards. Can do. Accordingly, the housing 1 or the lid body 2 can be reduced in size, and the electric motor control device 101 itself can be reduced in size.

  Next, the structure of the electric motor control apparatus 102 according to the second embodiment of the present invention will be described with reference to FIGS.

  FIG. 6 is an exploded perspective view of the electric motor control device 102. FIG. 7 is an assembled perspective view of the electric motor control device 102. FIG. 8 is a plan view of the electric motor control device 102. 9 is a cross-sectional view taken along the line CC of FIG. 10 is a cross-sectional view taken along the line DD of FIG.

  As shown in FIGS. 6 to 10, the lid body 2 of the electric motor control device 102 does not have an internal fin, but has an external fin 2 g. The external fin 2g protrudes from the outer surface of the main body 2a that does not face the housing 1 to the side opposite to the electric motor M. The external fin 2g is provided so as to be parallel to the rotation axis J of the electric motor M and to extend in the radial direction of the main body 2a through the center of the main body 2a of the lid 2. The width in the radial direction of the external fin 2g is set within a range equal to or smaller than the diameter of the main body 2a. That is, the external fin 2g is formed so as not to protrude from the main body 2a in the radial direction (side).

  As shown in FIGS. 9 and 10, a concave fitting portion 2h that opens to face the storage space K closed by the casing 1 and the lid 2 is provided inside the external fin 2g. Of the inner side surfaces parallel to the rotation axis J of the electric motor M of the fitting portion 2 h, the largest inner side surface 2 i is a connection surface for thermally connecting the heat generating electronic components 32 on the metal substrate 3. As shown in FIGS. 6 and 7, a plurality of through holes 2j are formed on the side walls of the external fin 2g facing the connection surface 2i.

  As shown in FIGS. 9 and 10, the metal substrate 3 is inserted into the insertion portion 2h, the metal surface 3b is brought into contact with the connection surface 2i, and the metal substrate 3 is attached by a screw that penetrates the through hole 2j (FIG. 6). It is fixed to the connection surface 2i. Thus, the heat generating electronic component 32 is thermally connected to the inside of the external fin 2g of the lid body 2 via the metal substrate 3. An insulating heat conductive sheet may be interposed between the metal surface 3b and the connection surface 2i.

  9 and 10, the lower end portion of the metal substrate 3 protrudes from the insertion portion 2h toward the storage space K. As another example, the entire metal substrate 3 may be inserted into the insertion portion 2h. Good.

  A plurality of fixed bases 2k are provided on the inner surface of the main body 2a of the lid 2 that faces the housing 1. The control board 4 is fixed to the front end of the fixed base 2k with a screw. The control board 4 is arranged on the electric motor M side with respect to the metal board 3 in a posture perpendicular to the rotation axis J of the electric motor M. A rotation sensor 8 is mounted on the surface 4 a of the control board 4 that does not face the lid 2 so as to face the rotation axis J of the electric motor M.

  At the lower end portion of the metal substrate 3, the root portion of the substrate connection terminal 5 and the root portion of the motor connection terminal 6 are mounted. The front end portion of the board connection terminal 5 is connected to the through hole 4 h (FIG. 6) of the control board 4 in the storage space K. The tip of the motor connection terminal 6 is connected to the motor terminal Mt (FIG. 9) in the storage space K by welding or the like.

  As shown in FIG. 6, the input / output connector 7 is a composite connector in which a power connector 7a and a signal connector 7b are integrated. As shown in FIGS. 8 and 9, the input / output connector 7 is erected on the outer surface of the main body 2 a of the lid 2 on one side of the external fin 2 g with a predetermined interval from the external fin 2 g. A housing 7j of the input / output connector 7 is fitted into a through hole 2m formed in the main body 2a from the inside facing the housing 1, and is fixed to a peripheral portion of the through hole 2m with a screw or the like.

  The upper ends of the terminals 7e and 7f of the input / output connector 7 protrude into the fitting portions 7g and 7h, respectively (FIG. 8, etc.). As shown in FIG. 9, the lower ends of the terminals 7e and 7f penetrate the housing 7j and project into the storage space K. The lower end portion of the terminal 7 e is connected to the external connection terminal 9 mounted on the metal substrate 3. The lower end portion of the terminal 7f is connected to the through hole 4i (FIG. 6) of the control board 4.

  According to the second embodiment, the metal substrate 3 is fitted into the fitting portion 2h provided inside the external fin 2g of the lid body 2, and the metal of the metal substrate 3 is connected to the connection surface 2i that is the inner surface of the fitting portion 2h. The surface 3b is fixed, and the heat generating electronic component 32 of the drive circuit 31 mounted on the metal substrate 3 is thermally connected to the connection surface 2i. For this reason, the heat generated in the heat generating electronic component 32 can be transmitted to the external fin 2g via the metal substrate 3, and the heat can be efficiently radiated from the external fin 2g to the outside. Further, since the external fin 2g, the fitting portion 2h, and the metal substrate 3 protrude on the side opposite to the electric motor M in the storage space K, the heat generated by the heat generating electronic component 32 is efficiently transmitted outward around the external fin 2g. It can dissipate heat well. Moreover, since the surface area of the cover body 2 increases by providing the external fin 2g and the fitting part 2h, the heat dissipation by the cover body 2 can be improved more.

  Further, since the heat generating electronic component 32 and the metal substrate 3 are disposed on the opposite side of the storage space K from the electric motor M along with the external fin 2g and the fitting portion 2h, the storage space K is reduced as compared with the first embodiment. Thus, the housing 1 can be downsized in a direction (height direction) parallel to the rotation axis J of the electric motor M.

  Moreover, in the said 2nd Embodiment, the external fin 2g is provided so that it may pass in the radial direction of the main-body part 2a through the center part of the main-body part 2a of the cover body 2. As shown in FIG. For this reason, it is possible to increase the area of the connection surface 2i by increasing the radial width of the external fin 2g within a range equal to or smaller than the diameter of the main body 2a. Thereby, the heat generating electronic component 32 or the metal substrate 3 on which the heat generating electronic component 32 is mounted can be easily thermally connected to the connection surface 2i, and the heat dissipation by the lid 2 can be improved.

  Further, in the second embodiment, since the external fin 2g is formed so as not to protrude in the radial direction from the main body 2a, the lid body 2 does not increase in the radial direction, and the electric motor control device 102 is reduced in size. Can be

  In the present invention, various embodiments other than those described above can be adopted. For example, in the above embodiment, the example in which the heat generating electronic component 32 included in the drive circuit 31 is thermally connected to the connection surfaces 2d and 2i of the lid body 2 via the metal substrate 3 has been described. It is not limited to this. In addition to this, for example, as in the third embodiment shown in FIG. 11 and the fourth embodiment shown in FIG. 12, the heat generating electronic component 32 is directly thermally connected to the connection surfaces 2d and 2i of the lid 2. Also good.

  In the electric motor control device 103 according to the third embodiment shown in FIG. 11, a plurality of side surfaces 2 d ′ of the internal fins 2 b of the lid body 2 are used as connection surfaces. Specifically, the two side surfaces 2d 'having the largest area of the internal fin 2b are used as connection surfaces. Then, the outer surface of the sealing portion 33a of the switching element 33, which is a heat generating electronic component of the drive circuit 31, is brought into contact with each connection surface 2d 'so that heat can be transmitted.

  In the electric motor control device 104 according to the fourth embodiment shown in FIG. 12, a plurality of inner side surfaces 2 i ′ of the external fins 2 g of the lid body 2 are used as connection surfaces. Specifically, the two side surfaces 2i 'having the largest area of the external fin 2g are used as connection surfaces. Then, the outer surface of the sealing portion 33a of the switching element 33 is brought into contact with each connection surface 2i 'so that heat is transmitted.

  The sealing portion 33a of the switching element 33 is made of synthetic resin. The terminal 33b of the switching element 33 is a conductor and protrudes from the sealing portion 33a. The tip of the terminal 33b is electrically connected to the control board 4.

  Although not shown, the components of the drive circuit 31 other than the switching element 33 are fixed to the lid 2 or the housing 1 in the storage space K via a member such as a board or a frame or directly. It may be mounted on the control board 4. What is necessary is just to fix electric circuits and electronic components other than the drive circuit 31 and the control circuit 41 to the lid body 2 and the housing 1 in the storage space K.

  Generated from the switching element 33 by thermally connecting the outer surface of the sealing portion 33a of the switching element 33 to the connection surfaces 2d ′ and 2i ′ of the lid 2 as in the third and fourth embodiments. The transmitted heat can be efficiently transmitted from the connection surfaces 2d ′ and 2i ′ to the lid 2 and efficiently radiated from the lid 2 to the outside.

  As another embodiment, a heat generating electronic component included in the drive circuit may be modularized, and the module may be thermally connected to the connection surface of the lid directly or indirectly through a heat conducting member. . Moreover, you may use members other than a metal substrate and a heat conductive sheet as a heat conductive member.

  Moreover, although the example which fixed the control board 4 to the cover body 2 was shown in the above embodiment, you may fix the control board to the housing | casing 1. FIG. Further, the control board 4 may be arranged in parallel with the rotation axis J of the electric motor M in the storage space K.

  Moreover, although the part which accommodates the board | substrates 3 and 4 and the part which mounts the electric motor M showed the example provided integrally in the above embodiment in the above embodiment, this invention is limited only to this. Not what you want. In addition to this, it is also possible to use a case in which the part for housing the board and the part for mounting the electric motor are formed separately, and both parts are fixed with screws or the like to be integrated.

  Moreover, in the above embodiment, although the case 1 was formed in the cylindrical shape and the main-body part 2a of the cover body 2 was formed in the disk shape, this invention is not limited only to this. For example, you may form the storage part of a housing | casing in a rectangular box or a polygonal cylinder. In that case, a metal substrate, a control substrate, an input / output connector, and the like may be manufactured in accordance with the shape of the storage portion.

  Furthermore, in the above embodiment, the example in which the present invention is applied to the electric motor control devices 101 to 104 used in the electric power steering system is described. However, the present invention is also applied to the electric motor control devices for other uses. It is possible to apply the invention.

DESCRIPTION OF SYMBOLS 1 Housing | casing 2 Lid 2b Internal fin 2c External fin 2d, 2d 'Connection surface 2g External fin 2h Insertion part 2i, 2i' Connection surface 3 Metal substrate 3a One surface of a metal substrate 3b Metal surface 4 Control substrate 7, 7a, 7b Input / output connector 8 Rotation sensor 31 Drive circuit 32 Heat generating electronic component 33 Switching element (heat generating electronic component)
33a Sealing part 41 Control circuit 101, 102, 103, 104 Electric motor control device J Rotating shaft K Storage space M Electric motor

Claims (10)

A drive circuit for driving the electric motor;
A control circuit for controlling the drive circuit;
A housing in which the electric motor is mounted;
A lid that also serves as a heat sink;
An input / output connector for electrically connecting an external device to the drive circuit or the control circuit,
In the electric motor control device in which the drive circuit and the control circuit are housed in a housing space formed by engaging the lid on the opposite side of the housing to the electric motor,
The lid body has a connection surface for thermally connecting heat generating electronic components included in the drive circuit,
The electric motor control device according to claim 1, wherein the connection surface is parallel to a rotation axis of the electric motor. In the electric motor control device according to claim 1,
The drive circuit is mounted on one surface of a metal substrate,
The other surface of the metal substrate is a metal surface;
The electric motor control device, wherein the metal substrate is fixed to the lid so that the metal surface is in contact with the connection surface. In the electric motor control device according to claim 1 or 2,
The lid further has an internal fin protruding into the storage space,
The electric motor control device according to claim 1, wherein the connection surface is a side surface of the internal fin parallel to the rotation axis of the electric motor. In the electric motor control device according to claim 3,
The electric motor controller according to claim 1, wherein the internal fin is provided so as to extend in a radial direction of the lid through the center of the lid. In the electric motor control device according to any one of claims 1 to 4,
The lid further has an external fin protruding from an outer surface not facing the housing,
The electric motor control device according to claim 1, wherein the input / output connector protrudes from an outer surface of the housing in parallel to the external fin and at a predetermined interval. In the electric motor control device according to claim 1 or 2,
The lid is
An external fin protruding from the outer surface not facing the housing;
A concave fitting portion provided inside the external fin and opening to face the storage space;
The electric motor control device according to claim 1, wherein the connection surface is an inner surface parallel to a rotation axis of the electric motor of the fitting portion. In the electric motor control device according to claim 6,
The electric motor control device according to claim 1, wherein the external fin is provided so as to extend in a radial direction of the lid through the center of the lid. In the electric motor control device according to claim 6 or 7,
The electric motor control device according to claim 1, wherein the input / output connector projects from the outer surface of the housing in parallel to the external fin and at a predetermined interval. In the electric motor control device according to claim 1,
The heat generating electronic component includes a switching element,
An electric motor control device, wherein an outer surface of a sealing portion of the switching element is brought into contact with the connection surface of the lid so that heat is transmitted. In the electric motor control device according to any one of claims 1 to 9,
The control circuit is mounted on a control board composed of a printed circuit board,
The control board is disposed on the electric motor side with respect to the drive circuit in a posture perpendicular to the rotation axis of the electric motor,
An electric motor control device, further comprising a rotation sensor mounted on the control board so as to face the rotation shaft of the electric motor and detecting rotation of the rotation shaft.

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