WO2012137333A1 - モールドモジュール、及び電動パワーステアリング装置 - Google Patents
モールドモジュール、及び電動パワーステアリング装置 Download PDFInfo
- Publication number
- WO2012137333A1 WO2012137333A1 PCT/JP2011/058808 JP2011058808W WO2012137333A1 WO 2012137333 A1 WO2012137333 A1 WO 2012137333A1 JP 2011058808 W JP2011058808 W JP 2011058808W WO 2012137333 A1 WO2012137333 A1 WO 2012137333A1
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- WIPO (PCT)
- Prior art keywords
- electric motor
- mold module
- electric power
- mold
- power steering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
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- B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
- B62D5/0406—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box including housing for electronic control unit
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Definitions
- the present invention relates to a mold module formed by molding a plurality of terminals and a plurality of electronic components mounted on the respective terminals with an insulating resin, and an electric power steering apparatus using the mold module.
- the electronic components of the power section that constitutes the inverter and electronic relay are mounted on a substrate made of metal, ceramic, etc., and the heat of the electronic component is transferred from the lower surface of the substrate via heat radiation grease.
- the heat sink is configured to dissipate heat (see, for example, Patent Document 1).
- the electronic parts of the power section constituting the inverter and the electronic relay are mounted on a substrate made of metal, ceramic, etc., and the electronic components are transmitted from the bottom surface of the substrate via heat radiation grease. Since the heat of the component is radiated to the heat sink, there is a problem that the temperature distribution of each electronic component is not uniform, the thermal resistance of the heat radiation path is increased, and the heat radiation property is deteriorated.
- the present invention has been made to solve the above-mentioned problems in the conventional apparatus.
- the temperature distribution of each electronic component such as a semiconductor chip used in an electronic relay or an inverter circuit section is made uniform to dissipate heat.
- An object of the present invention is to provide a mold module and an electric power steering device that can improve the performance.
- the mold module according to the present invention is a mold module formed by molding a plurality of terminals forming wiring and a plurality of electronic components mounted on each of the terminals with a mold resin, and the plurality of terminals includes at least the terminals. A part is exposed on the back surface of the mold resin.
- An electric power steering apparatus controls a reduction mechanism connected to a steering shaft of a vehicle, an electric motor having a rotor shaft connected to the reduction mechanism, and electric power supplied to an armature winding of the electric motor.
- An electric power steering device comprising: an electric motor control device that generates a predetermined torque in the electric motor, wherein the electric motor control device includes a plurality of terminals that form wiring and a plurality of terminals mounted on the respective terminals.
- An electronic component is molded with a mold resin, and at least a part of the plurality of terminals is exposed on the back surface of the mold resin, and the mold module has the back surface through a heat transfer resin. It is fixed to the case of the electric motor.
- an electric power steering apparatus controls a reduction mechanism connected to a steering shaft of a vehicle, an electric motor having a rotor shaft connected to the reduction mechanism, and electric power supplied to an armature winding of the electric motor.
- An electric power steering device comprising: an electric motor control device that generates a predetermined torque in the electric motor, wherein the electric motor control device includes a plurality of terminals that form wiring and a plurality of terminals mounted on the respective terminals.
- the mold module is molded with a mold resin, and at least a part of the plurality of terminals is exposed on the back surface of the mold resin, and the mold module includes a ceramic insulating sheet on the back surface. It is fixed to the case of the electric motor.
- the electric power steering device controls a reduction mechanism connected to a steering shaft of a vehicle, an electric motor having a rotor shaft connected to the reduction mechanism, and electric power supplied to an armature winding of the electric motor.
- An electric power steering device comprising: an electric motor control device that generates a predetermined torque in the electric motor, wherein the electric motor control device includes a plurality of terminals that form wiring and a plurality of terminals mounted on the respective terminals.
- An electronic component molded with a mold resin, and at least a part of the plurality of terminals are exposed on the back surface of the mold resin, a heat sink, and a control device case that houses the mold module and the heat sink.
- the mold module has the back surface through a heat transfer resin. And it is characterized in that it is secured to the serial heatsink.
- an electric power steering apparatus controls a reduction mechanism connected to a steering shaft of a vehicle, an electric motor having a rotor shaft connected to the reduction mechanism, and electric power supplied to an armature winding of the electric motor.
- An electric power steering device comprising: an electric motor control device that generates a predetermined torque in the electric motor, wherein the electric motor control device includes a plurality of terminals that form wiring and a plurality of terminals mounted on the respective terminals.
- An electronic component molded with a mold resin, and at least a part of the plurality of terminals is exposed on the back surface of the mold resin, a heat sink, and a control device case that houses the mold module and the heat sink.
- the mold module has a ceramic back surface And it is characterized in that it is secured to the heat sink via the insulation sheet.
- the mold module of the present invention since at least a part of the plurality of terminals is exposed on the back surface of the mold resin, when the mold module is mounted on the electric power steering device, the back surface of the mold module is attached to the case of the motor or By fixing to a heat sink or the like via a heat transfer resin, it is possible to obtain a mold module that reduces the thermal resistance of an electronic component such as a semiconductor chip and enhances the heat dissipation effect, both regularly and transiently.
- the motor control device includes a plurality of terminals forming wiring and a plurality of electronic components mounted on each of the terminals molded by a mold resin, and the plurality of the plurality of terminals. Since at least a part of the terminal is provided with a mold module exposed on the back surface of the mold resin, the mold module is fixed to the case of the electric motor via the heat transfer resin, so that the transient is also steady. In particular, it is possible to obtain an electric power steering device that reduces the thermal resistance of an electronic component such as a semiconductor chip and increases the heat dissipation effect.
- the electric motor control device includes a plurality of terminals forming wiring and a plurality of electronic components mounted on the respective terminals molded by a mold resin, and the plurality of the plurality of terminals. Since at least a part of the terminal is provided with a mold module that is exposed on the back surface of the mold resin, the back surface of the mold module is fixed to the case of the motor via a ceramic insulating sheet. While maintaining the thickness of the insulation sheet, the spacing is stabilized, and the insulation between the mold module and the motor case is improved even when conductive foreign matter is mixed in, the lower surface of the mold module or the case of the motor is deformed, and burrs are generated. Insulation reliability can be improved. .
- the motor control device includes a plurality of terminals forming wiring and a plurality of electronic components mounted on each of the terminals molded by a mold resin, and the plurality of the plurality of terminals.
- the mold module includes a heat transfer resin on the back surface. Therefore, an electric power steering apparatus can be obtained that reduces the thermal resistance of electronic components such as semiconductor chips and increases the heat dissipation effect, both regularly and transiently.
- the electric motor control device includes a plurality of terminals forming wiring and a plurality of electronic components mounted on the respective terminals molded by a mold resin, and the plurality of the plurality of terminals.
- the mold module has an insulating back surface made of ceramic. Since it is fixed to the heat sink through the sheet, the interval is stabilized by the thickness of the insulating sheet while maintaining high thermal conductivity, and when the conductive foreign matter is mixed, the lower surface of the mold module or the heat sink is deformed, or burrs are generated. Mold module etc. It is possible to improve the insulation reliability since it is possible to ensure insulation between the heat sink and.
- 1 is a cross-sectional view of an electric power steering device according to Embodiment 1 of the present invention.
- 1 is a cross-sectional view of a controller-integrated electric motor in an electric power steering apparatus according to Embodiment 1 of the present invention. It is a side view which shows the side by the side of the electric motor side of the deceleration mechanism side case in the electric power steering apparatus by Embodiment 1 of this invention in the state in which the power mold module and the relay mold module were attached. It is sectional drawing which shows the structure of the mold module used for the electric power steering apparatus by Embodiment 1 of this invention.
- 1 is a circuit diagram of an electric power steering device according to Embodiment 1 of the present invention.
- FIG. 1 is a cross-sectional view of an electric power steering apparatus according to Embodiment 1 of the present invention
- FIG. 2 is a cross-sectional view of a controller-integrated electric motor in the electric power steering apparatus according to Embodiment 1 of the present invention.
- the controller-integrated electric motor used in the electric power steering apparatus according to Embodiment 1 is configured as a permanent magnet type synchronous electric motor.
- an electric power steering apparatus 100 includes a controller integrated motor 30 that is connected to a steering shaft 10 connected to a handle (not shown) operated by a driver via a speed reduction mechanism 20. It is connected.
- the controller-integrated electric motor 30 applies assist torque to the steering shaft 10 via the speed reduction mechanism 20 when the driver operates the steering wheel, thereby reducing the driver's steering operation force.
- the reduction mechanism 20 includes a worm wheel 21 fixed to the steering shaft 10, a worm gear 22 having a worm gear shaft 23 that meshes with the worm wheel 21, and a housing 24.
- the worm gear shaft 23 is spline-coupled to the rotor shaft 43 of the controller-integrated electric motor 30 by a boss 31 as a coupling fixed to the end of the rotor shaft 43 of the controller-integrated electric motor 30.
- the controller-integrated electric motor 30 includes an electric motor unit 40 including a stator 41, a rotor 42, and a three-phase stator winding (hereinafter simply referred to as a stator winding) 413 as an armature winding, and an electric motor drive circuit.
- a control device unit 50 as an electric motor control device and a reduction mechanism side case 60 as a metal case.
- the stator 41 includes a hollow cylindrical stator core 411 formed by laminating a plurality of electromagnetic steel plates, and a stator winding wound around the stator core 411 via a resin insulator 412. 413.
- the stator core 411 is press-fitted and fixed to the inner surface side of an iron cylindrical frame 414.
- the frame 414 includes a bottom portion 4141 at one end portion in the axial direction, and a rear bearing box 4142 is formed at the center of the bottom portion 4141.
- a rear bearing 431 formed by a ball bearing is press-fitted and fixed to the inner peripheral surface of the rear bearing box 4142 of the frame 414.
- the other end portion in the axial direction of the frame 414 is opened, and an inlay portion 4143 for coupling to the motor-side case 51 is formed at the peripheral edge portion of the opened other end portion.
- the frame 414 has an inlay portion 4143 fitted into a step portion formed on the outer peripheral surface of one end portion in the axial direction of the motor-side case 51, and is fixed to the motor-side case 51 by screws (not shown).
- the above-mentioned motor side case 51 is formed of an aluminum alloy die-cast product, and the other axial end is coupled to the axial end of the speed reduction mechanism side case 60.
- the stator winding 413 includes U-phase, V-phase, and W-phase windings.
- the stator winding 413 is Y-connected by a winding terminal 416 accommodated in a resin terminal holder 415. .
- the stator winding 413 may be ⁇ -connected.
- the rotor 42 includes the above-described rotor shaft 43 and a rotor magnetic pole 422 made of a permanent magnet fixed to the outer periphery of the rotor shaft 43.
- One end of the rotor shaft 43 is rotatably supported by the aforementioned rear bearing 431.
- the rotor magnetic pole 422 rotates in synchronization with the rotation of the rotating magnetic field generated when the three-phase alternating current is supplied to the stator winding 413.
- the speed reduction mechanism side case 60 is formed of an aluminum alloy die-cast product, and includes an inner wall portion 601 extending in a direction perpendicular to the axial direction.
- a front bearing box 602 is formed at the center of the inner wall 601.
- a front bearing 432 formed by a ball bearing is press-fitted and fixed to the inner peripheral surface of the front bearing box 602.
- the speed reduction mechanism side case 60 and the housing 24 of the speed reduction mechanism 20 are configured such that an inlay portion 603 formed at one end in the axial direction of the speed reduction mechanism side case 60 is fitted to the inner peripheral surface of the housing 24 of the speed reduction mechanism 20. (Not shown) are integrally fixed.
- a rotation sensor 70 constituted by a resolver is provided at the center of the internal space of the speed reduction mechanism side case 60.
- the rotation sensor 70 includes a stator 71 fixed to an inner peripheral portion of a terminal mold portion 56 (described later) fixed to the inside of the speed reduction mechanism side case 60, and a rotor 72 fixed to the outer peripheral surface of the rotor shaft 31. With.
- the detection winding provided on the stator 71 of the rotation sensor 70 generates a rotation detection signal corresponding to the rotation speed of the rotor 72 and thus the rotation speed of the rotor 42 of the electric motor 40.
- the control device unit 50 includes a control device unit internal space communicating with the internal space of the electric motor unit 40, and a control board made of glass epoxy resin in which the microcomputer 531 and the FET drive circuit 532 are mounted in the control device unit internal space. 53, and three power mold modules 541, 542, 543 (in which two power semiconductor chips constituted by power MOSFETs, one relay semiconductor chip, and one shunt resistor are respectively mounted and built-in) In FIG. 2, only 541 is displayed), and one relay mold module 55 on which two relay semiconductor chips are mounted is housed. Details of mounting and incorporation of the semiconductor switch elements and the like in the three power mold modules 541, 542, and 543 and one relay mold module 55 will be described later.
- the power mold modules 541, 542, and 543 and the relay mold module 55 may be collectively referred to simply as a mold module.
- FIG. 3 is a side view showing the electric motor side surface of the speed reduction mechanism side case in the electric power steering apparatus according to Embodiment 1 of the present invention in a state where the power mold module and the relay mold module are attached.
- the three power mold modules 541, 542, and 543 are provided corresponding to the U-phase, V-phase, and W-phase windings of the stator winding 413, respectively.
- the modules 541, 542, and 543 are arranged almost evenly radially around the rotor shaft 43 as shown in FIG.
- the relay mold module 55 is located between the power mold modules 541 and 543 and arranged in the upper part of the figure. These power mold modules 541, 542, and 543 and the relay mold module 55 are closely fixed to the electric motor side wall surface of the inner wall 601 of the speed reduction mechanism side case 60. The power mold modules 541, 542, and 543 and the relay mold module 55 may be closely fixed to the speed reducer side wall surface of the inner wall portion 601 of the speed reducer side case 60.
- the power mold module and the relay mold module described above constitute the mold module of the present invention.
- the configuration of the power mold module 541, 542, 543 will be described in detail with the power mold module 541 as a representative. Since the configuration of the power mold modules 542 and 543 is the same as that of the power mold module 541, description thereof is omitted.
- the power mold module 541 includes a power semiconductor chip 541a constituting the U-phase upper arm of the three-phase bridge circuit constituting the motor drive circuit and a power semiconductor chip constituting the U-phase lower arm. 541b, one relay semiconductor chip 541c inserted between the U-phase winding of the stator winding 413 and the U-phase output terminal of the three-phase bridge circuit, a power semiconductor chip 541b, and a power supply GND
- One shunt resistor 541d inserted therebetween is directly mounted on a lead frame / die pad portion 5411 of a copper lead frame 5410 having high conductivity and high heat conductivity by solder.
- the power semiconductor chips 541a and 541b, the relay semiconductor chip 541c, and the shunt resistor 541d may be collectively referred to simply as elements.
- the lead frame 5410 is connected to an external power source, a power supply GND, and a motor power line in addition to the above-described lead frame / die pad portion 5411.
- a lead frame terminal portion 5413 directly connected to an element for inputting / outputting signals to / from the outside, and a large current line between elements such as the power semiconductor chip 541b or the relay semiconductor chip 541c directly inside the mold module 541 It consists of a power terminal unit 5414 to be connected.
- a plurality of lead frame terminal portions 5413 are led out of the mold module and connected to a control board 53 made of glass epoxy resin on which a microcomputer 531 and an FET drive circuit 532 are mounted.
- the lead frame power line lead-out portion 5412 led out of the mold module 541 dissipates heat and is directly connected to a power terminal 561 of a terminal mold portion 56 (see FIG. 2) to be described later.
- the heat is dissipated by heat conduction.
- the surface opposite to the mounting surface of the lead frame / die pad portion 5411 on which the element is mounted forms a heat radiating surface so that substantially the entire surface is exposed from the bottom surface of the mold resin.
- the heat generation is radiated to the speed reduction mechanism side case 60 side having a heat sink function.
- FIG. 4 is a cross-sectional view showing a configuration of a mold module used in the electric power steering apparatus according to Embodiment 1 of the present invention, and shows a power mold module 541.
- FIG. 4 is a cross-sectional view of the power mold module 541 attached to the speed reduction mechanism side case 60 having a heat sink function.
- each element of the lead frame die pad portion 5411 directly mounting the power semiconductor chips 541a and 541b (not shown), the relay semiconductor chip 541c, and the shunt resistor 541d (not shown).
- the rear surface which is the surface opposite to the surface, is exposed from the mold resin 554 to form a heat radiating surface, and has high thermal conductivity filled between the inner wall portion 601 of the speed reduction mechanism side case 60 having a heat sink function, and The heat generation of the element is radiated to the speed reduction mechanism side case 60 side having a heat sink function through an adhesive 555 as an electrically insulating heat transfer resin.
- the power mold module 541 including the power semiconductor chips 541a and 541b, the relay semiconductor chip 541c, the shunt resistor 541d, the lead frame 5410, and the like is molded and fixed integrally with a resin molding agent 554 as a molding resin.
- the thermal balance inside the module is achieved by heat conduction of the resin molding agent 554.
- each element on the lead frame / die pad portion 5411 generates heat corresponding to the power loss.
- the heat radiation from the back surface of the lead frame / die pad 5411 The thermal resistance can be reduced as the area of the lead frame die pad 5411 on which the element is mounted is larger.
- the part corresponding to the back surface of the power mold module 541 in the speed reduction mechanism side case 60 is formed to be thicker than the other parts, so that the heat capacity is increased, and the heat dissipation is improved.
- the film thickness of the adhesive 555 that is, the distance between the lead frame die pad part 5411 and the inner wall part 601 of the speed reduction mechanism side case 60 is the surface facing the back surface of the power mold module 541, that is, the inner wall part 601 of the speed reduction mechanism side case 60.
- the resin-made convex portions 556 formed in the step abut on the inner wall portion 601 of the speed reduction mechanism side case 60, so that a constant interval is maintained. As a result, a necessary insulation interval is stably maintained, and insulation between the speed reduction mechanism side case 60 and the power mold module 541 is ensured.
- the highly heat-conductive and electrically insulating adhesive 555 contains a filler 5551 which is heat-conductive particles for enhancing heat conduction.
- the source pads of the power semiconductor chip 541a and the relay semiconductor chip 541c are directly connected by a metallic power terminal portion 5414 having high conductivity and high thermal conductivity corresponding to large current conduction, and heat is generated due to resistance loss of the connection portion. And the whole is molded with the resin molding agent 554 to achieve thermal balance inside the module by heat conduction of the resin.
- the lead frame / die pad unit 5411 is formed integrally with the lead frame / power line deriving unit 5412 and directly and electrically connects the power mold module 541 and an external circuit via the lead frame / power line deriving unit 5412. In addition, the heat dissipation to the outside of the power mold module 541 is performed by heat conduction.
- the relay mold module 55 includes two relay semiconductor chips 551 and 552 that are inserted between the positive-side DC terminal of the above-described three-phase bridge circuit and a battery serving as a DC power source described later.
- the relay mold module 55 two relay semiconductor chips 551 and 552 are respectively connected to a lead frame die pad portion 5511 of a metallic lead frame 5510 having high conductivity and high heat conductivity. It is mounted directly by solder.
- the lead frame 5510 is connected to an external power source, a power source GND, and a motor / power line. Power for directly connecting a large current line between the two relay semiconductor chips 551 and 552 inside the lead frame terminal portion 5513 directly connected to the chip for inputting / outputting signals to / from the outside and the relay mold module 55 -It consists of a terminal part 5514.
- a plurality of lead frame terminal portions 5513 are led out of the relay mold module 55 and connected to a glass epoxy resin control board 53 (see FIG. 2) on which the microcomputer 531 and the FET drive circuit 532 are mounted.
- the lead frame power line lead-out portion 5512 radiates heat to the outside of the relay mold module 55 and is directly connected to and electrically connected to a power terminal 561 of the terminal mold portion 56 to be described later. Heat dissipation is also performed.
- the back surface which is the surface opposite to the mounting surface of the lead frame / die pad portion 5511 on which the element is mounted, is almost entirely exposed from the mold resin to form a heat radiating surface. It has a structure that radiates heat toward the speed reduction mechanism side case 60 side having a function. As in the case of the power mold module 541 described above, the portion of the speed reduction mechanism-side case 60 facing the back surface of the relay mold module 55 is formed thicker than the other portions so that the heat capacity is increased. The heat dissipation is improved.
- the relay mold module 55 including the relay semiconductor chips 551 and 552, the lead frame 5510, and the like is molded entirely with a resin molding agent that is a mold resin, similarly to the power mold module 541 described above.
- the internal member is fixed, and the thermal balance inside the module is achieved by the heat conduction of the resin molding agent.
- the mounting state to the speed reduction mechanism side case 60, the internal structure, heat dissipation to the speed reduction mechanism side case 60 via an adhesive, etc. are omitted because they have the same configuration and effects as the power mold module.
- a terminal mold portion 56 is integrally formed by insert molding a plurality of copper power terminals 561 into resin. .
- the terminal mold part 56 is fixed to the speed reduction mechanism side case 60 so as to fix the position while pressing the power mold modules 541, 542, 543 and the relay mold module 55 together on the speed reduction mechanism side case 60 side. Has been.
- the control board 53 is fixed to the side of the terminal mold portion 56 on the motor side, and is a fixed distance from the power mold modules 541, 542, 543, the relay mold module 55, and the speed reduction mechanism side case 60. Is secured.
- the power terminal 561 is connected to the power mold modules 541, 542, 543 and the lead frame power line deriving portions 5412, 5512 (see FIG. 3) derived from the relay mold module 55, so that each power terminal
- the terminal mold portion 56 includes three capacitors 81, 82, and 83 (only 81 is shown in FIG. 2) for absorbing the ripple of the current flowing through the stator winding 413 of the motor portion 40. ), A coil 84 for preventing noise is mounted, and is electrically connected to the power terminal 561.
- the power connector 90 fixed to the speed reduction mechanism side case 60 is electrically connected to the power terminal 561 and is three-phased via the semiconductor switch elements 551 and 552 mounted on the relay mold module 55 described above. Connected to the positive side DC terminal of the bridge circuit, led out of the speed reduction mechanism side case 60, and connected to a battery as a DC power source.
- FIG. 5 is a circuit diagram of the electric power steering apparatus according to Embodiment 1 of the present invention.
- the stator winding 413 is Y-connected by the winding terminal 416 as described above.
- one power semiconductor chip 541a constitutes the U-phase upper arm of the three-phase bridge circuit
- the other power semiconductor chip 541b constitutes a U-phase lower arm.
- the other end of the power semiconductor chip 541a is connected to a ripple absorbing capacitor 81 and a noise blocking coil 84, and the other end of the power semiconductor chip 541b is connected to the power supply GND via a shunt resistor 541d.
- the connection point at which one ends of the power semiconductor chips 541a and 541b are connected is the U-phase AC terminal side of the three-phase bridge circuit.
- the relay semiconductor chip 541c mounted on the power mold module 541 has one end connected to the U-phase AC terminal and the other end connected to the U-phase terminal of the stator winding 413.
- one power semiconductor chip 542a constitutes the W-phase upper arm of the three-phase bridge circuit
- the other The arm semiconductor chip 542b constitutes the W-phase lower arm.
- the other end of the power semiconductor chip 542a is connected to a ripple absorbing capacitor 82 and a noise blocking coil 84, and the other end of the power semiconductor chip 542b is connected to the power supply GND via a shunt resistor 542d.
- the connection point at which one ends of the power semiconductor chips 542a and 542b are connected is the W-phase AC terminal side of the three-phase bridge circuit.
- the relay semiconductor chip 542c mounted on the power mold module 542 has one end connected to the aforementioned W-phase AC terminal and the other end connected to the W-phase terminal of the stator winding 413.
- one power semiconductor chip 543a constitutes the V-phase upper arm of the three-phase bridge circuit, and the other The power semiconductor chip 543b constitutes a V-phase lower arm.
- the other end of the power semiconductor chip 543a is connected to a ripple absorbing capacitor 83 and a noise blocking coil 84, and the other end of the power element 543b is connected to the power supply GND via a shunt resistor 543d.
- the connection point at which one ends of the power semiconductor chips 543a and 543b are connected is the W-phase AC terminal side of the three-phase bridge circuit.
- the relay semiconductor chip 543d mounted on the power mold module 543 has one end connected to the V-phase AC terminal and the other end connected to the V-phase terminal of the stator winding 413.
- One end of the pair of relay semiconductor chips 551 and 552 mounted on the relay mold module 55 is connected to each other, and the other end of the one relay semiconductor chip 551 is connected to the positive electrode of the three-phase bridge circuit via the coil 84.
- the other relay semiconductor chip 552 is connected to the battery 85 mounted on the vehicle via the connector 90 (see FIGS. 1 and 2).
- the FET drive circuit 532 mounted on the control board 53 has the output terminals of the power semiconductor chips 541a, 541b, 542a, 542b, 543a, 543b, the relay semiconductor chips 541c, 542cc, 543c, and the relay semiconductor.
- the gates of the chips 551 and 552 are connected to each other, and a gate driving signal is given to each of these gates at a predetermined timing.
- the microcomputer 531 mounted on the control board 53 controls the output timing of the gate drive signal output from the FET drive circuit 532 based on the rotation detection signal from the rotation sensor 70 described above.
- a torque detection apparatus (not shown) is provided.
- the steering torque is detected and input to the microcomputer 531.
- a rotation detection signal corresponding to the steering rotation speed detected by the rotation sensor 70 is input to the microcomputer 531.
- the microcomputer 531 calculates an assist torque based on the input steering torque, steering rotational speed, vehicle speed signal, and the like, and applies torque for applying the assist torque to the steering shaft 10 via the speed reduction mechanism 20.
- the three-phase bridge circuit which is an electric motor drive circuit is controlled so that the unit 40 is generated.
- the FET drive circuit 532 generates a gate drive signal at a predetermined timing based on a command from the microcomputer 531 and outputs each power semiconductor chip 541a, 541b, 542a, 542b, 543a, 543b of the three-phase bridge circuit. Control continuity.
- the three-phase bridge circuit generates predetermined three-phase AC power, supplies the three-phase AC current to the stator winding 413 of the motor unit 40, and drives the motor unit 40. Torque generated by the electric motor unit 40 is applied as assist torque to the steering shaft 10 via the speed reduction mechanism 20. Thereby, the steering force by the driver is reduced.
- an abnormality of ON failure has occurred in one or a plurality of power elements among the power semiconductor chips 541a, 541b, 542a, 542b, 543a, 543b constituting the three-phase bridge circuit that is an electric motor driving circuit. Then, a normal three-phase alternating current is not supplied to the stator winding 413, and the operation of the electric motor unit 40 becomes abnormal, which may cause danger to the operation of the vehicle.
- the FET drive circuit 532 is inserted between the positive electrode side DC terminal of the three-phase bridge circuit and the battery 85 based on a command from the microcomputer 531.
- Relay semiconductor chips 541c, 542c which are connected between the AC output terminal of the three-phase bridge circuit and each phase winding of the stator winding 413, while stopping the gate drive signal to the relay semiconductor chips 551, 552, The gate drive signal to 543c is stopped.
- the three-phase bridge circuit as the electric motor drive circuit provided in the control unit 50 is disconnected from the battery 85 and stops operating, and the stator winding 413 is disconnected from the three-phase bridge circuit. Since the stator winding 413 is disconnected from the three-phase bridge circuit, the stator winding 413 is not short-circuited by the failed power semiconductor chip. Therefore, the braking force in the direction opposite to the steering direction is applied to the motor unit 40. Therefore, it is possible to prevent an abnormal situation such as the occurrence of the occurrence of difficulty in the steering wheel operation.
- the gate drive signals to the relay semiconductor chips 551 and 552 and the relay semiconductor chips 541c, 542c, and 543c may be stopped in the same manner as described above when a failure other than the power semiconductor chip occurs. Furthermore, depending on the failure state of the power semiconductor chip or the failure state other than the power semiconductor chip, only one of the semiconductor switches of the relay semiconductor chips 551 and 552 and the relay semiconductor chips 541c, 542c, and 543c is connected. The gate drive signal may be stopped.
- the switch connected between the DC terminal on the positive side of the three-phase bridge circuit and the battery 85, the AC output terminal of the three-phase bridge circuit, and the stator winding 413 are connected.
- Both of the switches are constituted by relay semiconductor chips, but only one of these switches may be constituted by a relay semiconductor chip and the other may be constituted by a mechanical relay or the like.
- the semiconductor chip as the heating element includes the resin-molded relay mold module 55 and the power mold module 541. 542, 543, and the mold module directly connects the lead frame / power line deriving portions 5412, 5512 to be signal lines to the semiconductor chip, and the semiconductor chip is directly connected to the surfaces of the lead frame / die pad portions 5411, 5511.
- the heat sink is formed so that the entire back surface of the lead frame / die pad portions 5411 and 5511 is exposed, and the heat is dissipated via the adhesive 555 to the speed reduction mechanism side case 60 having a function as a heat sink.
- the speed reduction mechanism side case 60 having a heat sink function has a thick back surface portion of the mold module. Can be improved.
- the power mold module on which the semiconductor switch element and the power element are mounted is divided into three parts for each phase, so that the case is mounted.
- the power mold module for each phase can be freely arranged, space can be used effectively, and the apparatus can be miniaturized. Further, since the three power mold modules are arranged radially around the rotor shaft of the motor unit, the projected area viewed from the rotor shaft direction can be further reduced. Embodiment 2.
- FIG. 6 is a cross-sectional view showing the configuration of a mold module used in the electric power steering apparatus according to Embodiment 2 of the present invention.
- the power semiconductor chips 541a, 542a, 543a, 541b, 542b, and 543b and the relay semiconductor chips 541c, 542c, and 543c each have a power loss generated to drive the electric power steering device.
- the temperature of each element can be averaged by changing the ratio of the lead frame / die pad area to the magnitude of the loss.
- the lead frame die pad portion on which the relay semiconductor chip 541c is mounted in order to make the temperature of the relay semiconductor chip 541c having a loss ratio larger than that of the power semiconductor chip 541a uniform, the lead frame die pad portion on which the relay semiconductor chip 541c is mounted.
- the area ratio of 5411 is configured to be larger than the area ratio of the lead frame die pad portion 5411 on which the power semiconductor chip 541a is mounted.
- the area ratio of the lead frame die pad is changed to achieve uniform temperature. be able to.
- FIG. 7 is a cross-sectional view showing a configuration of a mold module used in the electric power steering apparatus according to Embodiment 3 of the present invention.
- the power semiconductor chips 541a, 542a, 543a, 541b, 542b, 543b and the relay semiconductor chips 541c, 542c, 543c are mounted on the surface of the lead frame / die pad portions 5411, 5511, but the lead frame / die pad portion 5411, By increasing the thickness of 5511, the heat capacity can be increased and the heat conduction can be improved. In FIG. 7, among the mounted semiconductor chips, the thickness of the lead frame / die pad portion 5411 on which the relay semiconductor chip 541c having a large loss is mounted is increased.
- the thickness of the lead frame / die pad portion on which the element is mounted is set according to the magnitude of the loss of each built-in element. Therefore, the temperature of each element can be made uniform and heat can be radiated effectively.
- FIG. 8 is a cross-sectional view showing a configuration of a mold module used in the electric power steering apparatus according to Embodiment 4 of the present invention.
- the interval of the adhesive layer formed by the adhesive 555 filled between the mold module 541 and the speed reduction mechanism side case 60 having a function as a heat sink is set by the convex portion 556.
- the filler 5551 which is a heat conductive particle included in the adhesive 555 is used.
- Embodiment 5. FIG.
- FIG. 9 is a cross-sectional view showing a configuration of a mold module used in the electric power steering apparatus according to Embodiment 5 of the present invention.
- the adhesive 555 is filled between the mold module 541 and the speed reduction mechanism side case 60.
- high thermal conductivity and high strength are used instead of the adhesive.
- a ceramic insulating sheet 700 is inserted. Accordingly, the interval is stabilized by the thickness of the ceramic insulating sheet 700 while maintaining high thermal conductivity, and when the conductive foreign matter is mixed in, the lower surface of the mold module 541 or the speed reduction mechanism side case 60 is deformed, or burrs are generated.
- FIG. 10 is a cross-sectional view of a controller-integrated electric motor in an electric power steering apparatus according to Embodiment 6 of the present invention.
- the controller-integrated electric motor is configured as a permanent magnet type synchronous motor.
- the speed reduction mechanism side case 600 fixed to the speed reduction mechanism housing 24 is formed of an aluminum alloy die cast product.
- An inlay portion 6003 formed at the end of the speed reduction mechanism side case 600 is fitted into a housing of a speed reduction mechanism (not shown), and is fixed to the housing with a bolt or the like.
- a front bearing box 6002 is formed in the speed reduction mechanism side case 600.
- a front bearing 432 formed by a ball bearing is press-fitted and fixed to the inner peripheral surface of the front bearing box 6002.
- the rotation sensor 70 constituted by a resolver includes a stator 71 fixed to the speed reduction mechanism side case 60 (see FIG. 1) and a rotor 72 fixed to the outer peripheral surface of the rotor shaft 43.
- the power mold module 540 of the control unit 50 is disposed in the frame body 520 and is closely fixed to the wall portion 601 (see FIG. 1) of the speed reduction mechanism side case 60.
- the frame 414 of the electric motor unit 40 has an inlay portion formed at an axially open end thereof fitted to the electric motor side end of the speed reduction mechanism side 600 and is fixed to the speed reduction mechanism side case 600 by screws (not shown). .
- a control device case 520 as a metal case includes a heat sink 510 having a fin portion 511 and a cover 521.
- the control device case 520 is disposed and fixed at an upper portion of the speed reduction mechanism side case 600 in the figure.
- the heat sink 510 serving as the bottom of the control device case 520 is formed of an aluminum alloy, and is fixed to the lower end portion of the side wall portion of the control device case 520 with screws.
- a heat sink opening 512 having the same shape as the speed reduction mechanism side case opening formed on the upper surface of the speed reduction mechanism side case 600 and having the same center axis as the opening is formed on one side of the heat sink 510.
- the speed reduction mechanism side case opening and the heat sink opening are arranged so that their central axes coincide with each other and overlap.
- the mold module 540 includes a power semiconductor chip 541a that constitutes the U-phase upper arm of the three-phase bridge circuit that constitutes the motor drive circuit, and a power semiconductor chip 541b that constitutes the U-phase lower arm.
- a chip 543b is mounted.
- the mold module 540 includes a relay semiconductor chip 541c inserted between the U-phase winding of the stator winding and the U-phase output terminal of the three-phase bridge circuit, and a W-phase winding of the stator winding.
- Relay semiconductor chip 542c inserted between the W-phase output terminal of the three-phase bridge circuit, and relay semiconductor inserted between the V-phase winding of the stator winding and the V-phase output terminal of the three-phase bridge circuit Chip 543c, shunt resistor 541d inserted between power semiconductor chip 541b and power supply GND, shunt resistor 542d inserted between power semiconductor chip 542b and power supply GND, power semiconductor chip 543c and power supply GND And a shunt resistor 543d inserted between and mounted.
- FIG. 10 does not show a relay mold module including two relay semiconductor chips inserted between the positive side DC terminal of a three-phase bridge circuit as an electric motor drive circuit and an external battery.
- the relay mold module may be integrated with the power mold module 540, or may be fixed as a separate module in contact with the heat sink 510 in the same manner as the power mold module 540, or the speed reduction mechanism side case. It may be fixed in contact with the inner wall surface of 600.
- the control board 53 on which the microcomputer 531 and the FET drive circuit 532 are mounted is fixed to the upper end portion of the control device 520 with a space from the power mold module 540 inside the control device case 520.
- Three bus bars 91, 92, 93 (only 91 is shown in the figure) connected to the U-phase, V-phase, and W-phase terminals of the stator winding 413 of the motor unit 40 are the above-described speed reduction mechanism side case opening. Are led out from the heat sink opening 512 to the inside of the control device case 520 and connected to the relay semiconductor chip connected to the AC terminal of the three-phase bridge circuit.
- the above-described bus bars 91, 92, 93 are fixed to the base 931 fixed to the terminal holder 415 with screws 921.
- the detection winding provided on the stator of the rotation sensor 70 constituted by a resolver is connected to a control device side connector (not shown) provided in the control device case 520 via a signal connection connector 941 (not shown). Connected).
- the control device side connector is connected to a microcomputer 531 mounted on the control board 53.
- Other configurations are the same as those of the first embodiment.
- a single power mold module 540 includes power semiconductor chips for all phases of the U phase, the V phase, and the W phase, and motor fixing. Since all the relay semiconductor chips that cut off the conduction of the child windings, or the power mold module and the relay mold module are separately mounted, the power mold module 1 is compared with the power steering device according to the first embodiment. It is sufficient to mount one or two pieces on the electric power steering apparatus, and wiring between each power element can be performed in one or two power mold modules. Workability is improved and cost reduction is effective.
- control device case 520 mounted with the power mold module is provided outside the speed reduction mechanism side case 600, the parts of the motor unit 40 and the parts of the control unit 50 are not mixed, Design that specializes in the functions of
- the heat sink fin 511 may be provided on the outer wall surface of the speed reduction mechanism side case 60 protruding from the housing 24 of the speed reduction mechanism, or the wall portion of the metal case may be formed thick. Thereby, heat radiation of the power mold module fixed in contact with the metal case can be effectively performed.
- FIG. 11 is a cross-sectional view of an electric power steering apparatus according to Embodiment 7 of the present invention.
- the arrangement configuration of the controller-integrated electric motor 30 is such that the controller 50 including the motor drive circuit is in contact with the speed reduction mechanism 20 and the motor unit 40 is in contact with the other end.
- the motor unit 40 is in contact with the speed reduction mechanism 20 and the control unit 50 including the motor drive circuit is in contact with the other end. It has a structure.
- the electric motor unit 40 has a heat capacity with respect to the heat generated by the control unit 50, and also serves as a heat dissipation and heat conduction path, and generates heat when heated to the speed reduction mechanism 20 side. There is an effect of cooling the control unit 50 incorporating the.
- the mold module according to the present invention described above has the following features.
- the mold module according to the present invention is a mold module formed by molding a plurality of terminals forming wiring and a plurality of electronic components mounted on each of the terminals with a mold resin. , At least a part of which is exposed on the back surface of the mold resin.
- the heat resistance of an electronic component such as a semiconductor chip can be reduced and the heat dissipation effect can be enhanced both in a steady state and in a transient manner.
- each of the plurality of terminals has a surface area set in accordance with a magnitude of heat loss of the mounted electronic component.
- the mold module configured in this way, the area ratio of the heat radiation surface on the lower surface side of the die pad portion of the lead frame is changed according to the ratio of the loss power of the built-in electronic component.
- each of the plurality of terminals has a thickness set in accordance with a magnitude of heat loss of the mounted electronic component.
- the thickness of the lead frame is changed according to the total loss of the built-in electronic components or the ratio of the power loss of each electronic component.
- the plurality of terminals are configured by wirings connecting the plurality of electronic components.
- the power line connection of the internal semiconductor chip is connected by using a copper terminal instead of wire bonding, and the terminal crosses the mold module. This is effective in reducing heat generation and making the temperature distribution in the mold module, the chip, and the terminal uniform.
- An electric power steering apparatus includes a speed reduction mechanism connected to a steering shaft of a vehicle, an electric motor having a rotor shaft connected to the speed reduction mechanism, and electric power supplied to an armature winding of the electric motor.
- An electric power steering apparatus comprising: an electric motor control device that controls and generates a predetermined torque in the electric motor, wherein the electric motor control device is mounted on a plurality of terminals that form wiring and each of the terminals
- a plurality of electronic components are molded with a mold resin, and at least a part of the plurality of terminals is provided on a back surface of the mold resin.
- the mold module includes a heat transfer resin on the back surface.
- the electric power steering apparatus configured as described above, it is possible to obtain an electric power steering apparatus that reduces the thermal resistance of an electronic component such as a semiconductor chip and enhances the heat dissipation effect, both regularly and transiently.
- the case of the electric motor to which the mold module is fixed is a case on the speed reduction mechanism side fixed to the speed reduction mechanism.
- An electric power steering device that reduces the thermal resistance of an electronic component such as a semiconductor chip and enhances the heat dissipation effect can be obtained both in a steady and transient manner.
- the case of the electric motor to which the mold module is fixed is a case on the anti-deceleration mechanism side. According to the electric power steering apparatus configured as described above, it is possible to obtain an electric power steering apparatus that reduces the thermal resistance of an electronic component such as a semiconductor chip and enhances the heat dissipation effect, both regularly and transiently.
- the mold module includes a protrusion protruding from the back surface, and the heat transfer resin is disposed between the case of the electric motor and the back surface of the mold module. A gap formed by the protrusion is filled. According to the electric power steering apparatus configured as described above, the distance of the gap between the lower surface side of the lead frame filled with heat transfer resin and the case of the electric motor can be easily and reliably simply pressed down from the mold module. There is an effect that can be set and held.
- a filler mixed in the heat transfer resin is provided, and a gap between the case of the electric motor and the back surface of the mold module is secured by the filler. It is characterized by being. According to the electric power steering device configured as described above, the gap between the gaps is kept constant by the filler mixed in the heat transfer resin, so that a special production process facility or mechanism structure is added. There is an effect that the mold module can be easily set and held easily by simply pressing the mold module from above.
- An electric power steering apparatus includes a speed reduction mechanism connected to a steering shaft of a vehicle, an electric motor having a rotor shaft connected to the speed reduction mechanism, and electric power supplied to an armature winding of the electric motor.
- An electric power steering apparatus comprising: an electric motor control device that controls and generates a predetermined torque in the electric motor, wherein the electric motor control device is mounted on a plurality of terminals that form wiring and each of the terminals
- a plurality of electronic components are molded with a mold resin, and a mold module is formed in which at least a part of the plurality of terminals is exposed on the back surface of the mold resin.
- the mold module includes a ceramic insulating sheet on the back surface. It is fixed to the case of the electric motor.
- the interval is stabilized by the thickness of the ceramic insulating sheet while maintaining high heat conduction, and when the conductive foreign matter is mixed, the lower surface of the mold module or the case of the motor Since the insulation between the mold module and the case of the electric motor can be ensured even when deformation or burrs occur, the insulation reliability can be improved. Further, the thermal conductivity can be further enhanced by applying silicon grease for heat radiation between the ceramic insulating sheet and the mold module and between the ceramic insulating sheet and the motor case.
- An electric power steering apparatus includes a speed reduction mechanism connected to a steering shaft of a vehicle, an electric motor having a rotor shaft connected to the speed reduction mechanism, and electric power supplied to an armature winding of the electric motor.
- An electric power steering apparatus comprising: an electric motor control device that controls and generates a predetermined torque in the electric motor, wherein the electric motor control device is mounted on a plurality of terminals that form wiring and each of the terminals
- a mold module in which a plurality of electronic components are molded with a mold resin and at least a part of the plurality of terminals are exposed on the back surface of the mold resin, a heat sink that cools the mold module, the mold module, and the heat sink And a control device case for storing the mold module.
- Lumpur characterized in that the rear surface is secured to the heat sink via a heat transfer resin.
- the control device case is fixed to a case on the speed reduction mechanism side of the electric motor.
- the case of the electric motor having a large heat capacity serves as a heat conduction path to transfer heat to the gear side to which the electric power steering apparatus is attached, thereby increasing the effect of cooling the power circuit. Can do.
- the heat sink includes a heat sink opening formed at a position corresponding to a speed reduction mechanism side case opening formed in the case on the speed reduction mechanism side.
- the bus bar connected to the armature winding of the motor extends from the inside of the case on the speed reduction mechanism side of the electric motor to the inside of the control device case via the speed reduction mechanism side case opening and the heat sink opening, and the control device case It is connected to the mold module inside.
- the mold module includes a convex portion protruding from the back surface
- the heat transfer resin includes the protrusion between the heat sink and the back surface of the mold module. It fills in the clearance gap formed by. According to the electric power steering apparatus configured as described above, the distance between the lower surface side of the lead frame filled with heat transfer resin and the heat sink can be easily and reliably set by simply pressing the mold module from above. There is an effect that can be held.
- the electric power steering device includes a filler mixed in the heat transfer resin, and a gap between the heat sink and the back surface of the mold module is secured by the filler. And Because the gap distance is kept constant by the filler mixed in the heat transfer resin, it is easy and reliable just by pressing the mold module from the top without adding any special production equipment or mechanism structure. There is an effect that can be set and held.
- An electric power steering apparatus includes a speed reduction mechanism connected to a steering shaft of a vehicle, an electric motor having a rotor shaft connected to the speed reduction mechanism, and electric power supplied to an armature winding of the electric motor.
- An electric power steering apparatus comprising: an electric motor control device that controls and generates a predetermined torque in the electric motor, wherein the electric motor control device is mounted on a plurality of terminals that form wiring and each of the terminals
- a mold module in which a plurality of electronic components are molded with a mold resin, and at least a part of the plurality of terminals are exposed on the back surface of the mold resin, a heat sink, and a control device case that houses the mold module and the heat sink
- the mold module has a ceramic back surface Characterized in that it is fixed to the heat sink via the insulation sheet.
- the interval is stabilized by the thickness of the ceramic insulating sheet while maintaining high heat conduction, and when the conductive foreign matter is mixed, the lower surface of the mold module or the case of the heat sink Since the insulation between the mold module and the heat sink can be ensured even when deformation or burrs occur, the insulation reliability can be improved. Further, by applying a heat-dissipating silicon grease between the ceramic insulating sheet and the mold module and between the ceramic insulating sheet and the heat sink, the thermal conductivity can be further increased.
- the mold module includes a power semiconductor chip of a power conversion circuit that converts DC power from a DC power source into AC power and supplies the AC power to the armature winding. It is characterized by that.
- the electric power steering apparatus configured as described above, since it is possible to adopt a structure in which at least one phase upper and lower arms are built in the inverter circuit constituting the power conversion circuit, there is an effect of equalizing the temperature of the upper and lower arms. is there.
- the mold module includes a relay semiconductor chip that can cut off the electric motor from a power source. According to the electric power steering apparatus configured as described above, there is an effect that it is possible to realize an electronic relay for the electric power steering apparatus with improved temperature uniformity and heat dissipation.
- the electric motor is a control device-integrated electric motor equipped with the electric motor control device, and the electric motor control device extends an axis of a rotor shaft of the electric motor. It is arranged in a direction.
- the motor control apparatus including the power circuit and the electric motor are integrated into a structure that is thermally coupled to each other. Therefore, the case of the electric motor having a large heat capacity becomes the heat conduction path. Can effectively dissipate heat. Further, by attaching the motor control device to the speed reduction mechanism side, there is an effect that heat can be transferred to the speed reduction mechanism side to effectively cool the power circuit and the like.
- the electric motor is a control device-integrated electric motor equipped with the electric motor control device, and the electric motor control device is parallel to the axis of the rotor shaft of the electric motor. It is arrange
- the mold module and the electric power steering device according to the present invention are used in the field of steering devices in the automobile industry.
Abstract
Description
図1はこの発明の実施の形態1による電動パワーステアリング装置の断面図、図2はこの発明の実施の形態1による電動パワーステアリング装置に於ける制御装置一体型電動機の断面図である。この実施の形態1による電動パワーステアリング装置に用いられた制御装置一体型電動機は、永久磁石型同期型電動機として構成されている。
実施の形態2.
実施の形態3.
実施の形態4.
実施の形態5.
実施の形態6.
実施の形態7.
(1)この発明によるモールドモジュールは、配線を形成する複数のターミナルと前記夫々のターミナルに実装された複数の電子部品とをモールド樹脂によりモールディングしてなるモールドモジュールであって、前記複数のターミナルは、その少なくとも一部分が前記モールド樹脂の裏面に露出していることを特徴とする。このように構成されたモールドモジュールによれば、定常的にも過渡的にも、半導体チップ等の電子部品の熱抵抗を低減し放熱効果を高めることができる。
(5)この発明による電動パワーステアリング装置は、車両のステアリング軸に連結された減速機構と、前記減速機構に回転子軸が連結された電動機と、前記電動機の電機子巻線に供給する電力を制御して前記電動機に所定のトルクを発生させる電動機制御装置と、を備えた電動パワーステアリング装置であって、前記電動機制御装置は、配線を形成する複数のターミナルと前記夫々のターミナルに実装された複数の電子部品とがモールド樹脂によりモールディングされ、且つ前記複数のターミナルの少なくとも一部分が前記モールド樹脂の裏面に露出してなるモールドモジュールを備え、前記モールドモジュールは、前記裏面が伝熱樹脂を介して前記電動機のケースに固着されていることを特徴とする。このように構成した電動パワーステアリング装置によれば、定常的にも過渡的にも、半導体チップ等の電子部品の熱抵抗を低減し放熱効果を高める電動パワーステアリング装置を得ることができる。
20 減速機構、21 ウオームホイール、
22 ウオームギア、23 ウオームギア軸、
24 ハウジング、30 制御装置一体型電動機、
31 ボス、40 電動機部、
41 固定子、411 固定子鉄心、
412 絶縁体、413 固定子巻線、
414 フレーム、4141 底部、
4142 リアベアリングボックス、4143 インロー部、
415 ターミナルホルダ、416 巻線ターミナル、
42 回転子、422 回転子磁極、
43 回転子軸、431 リアベアリング、
432 フロントベアリング、50 制御装置部、
51 電動機側ケース、510 ヒートシンク、
511 ヒートシンクフィン、512 ヒートシンク開口部、
520 制御装置ケース、521 カバー、
53 制御基板、531 マイクロコンピュータ、
532 FET駆動回路、
540、541、542、543 パワー・モールドモジュール、
5410、5510 リードフレーム、
541a、541b、542a、542b、543a、543b パワー半導体チップ、
541c、542c、543c リレー半導体チップ、
541d、542d、543d シャント抵抗、
5411、5511 リードフレーム・ダイパッド部、
5412、5512 リードフレーム・パワーライン導出部、
5413、5513 リードフレーム・ターミナル部、
5414、5514 パワー・ターミナル部、
55 リレー・モールドモジュール、554 樹脂モールド剤、
555 接着剤、5551 フィラー、
556 凸部、700 セラミック製の絶縁シート
710 シリコングリース、56 ターミナル・モールド部、
561 パワー・ターミナル、60 減速機構側ケース、
600 減速機構側ケース、601 減速機構側ケースの内壁部、
602 フロントベアリングボックス、
6002 フロントベアリングボックス、603、6003 インロー部、
70 回転センサ、71 固定子、72 回転子、
81、82、83 コンデンサ、84 コイル、85 バッテリー、
90 電源コネクタ、901 固定部
91 バスバー、921 ネジ、931 ベース
Claims (20)
- 配線を形成する複数のターミナルと前記夫々のターミナルに実装された複数の電子部品とをモールド樹脂によりモールディングしてなるモールドモジュールであって、
前記複数のターミナルは、その少なくとも一部分が前記モールド樹脂の裏面に露出している、
ことを特徴とするモールドモジュール。 - 前記複数のターミナルは、前記実装されている前記電子部品の熱損失の大きさに応じて夫々の表面積が設定されている、
ことを特徴とする請求項1に記載のモールドモジュール。 - 前記複数のターミナルは、前記実装されている前記電子部品の熱損失の大きさに応じて夫々の厚みが設定されている、
ことを特徴とする請求項1に記載のモールドモジュール。 - 前記複数のターミナルは、前記複数の電子部品を接続する配線により構成されている、
ことを特徴とする請求項1乃至3のうちの何れか一項に記載のモールドモジュール。 - 車両のステアリング軸に連結された減速機構と、前記減速機構に回転子軸が連結された電動機と、前記電動機の電機子巻線に供給する電力を制御して前記電動機に所定のトルクを発生させる電動機制御装置と、を備えた電動パワーステアリング装置であって、
前記電動機制御装置は、配線を形成する複数のターミナルと前記夫々のターミナルに実装された複数の電子部品とがモールド樹脂によりモールディングされ、且つ前記複数のターミナルの少なくとも一部分が前記モールド樹脂の裏面に露出してなるモールドモジュールを備え、
前記モールドモジュールは、前記裏面が伝熱樹脂を介して前記電動機のケースに固着されている、
ことを特徴とする電動パワーステアリング装置。 - 前記モールドモジュールを固着している前記電動機のケースは、前記減速機構に固定される減速機構側のケースである、
ことを特徴とする請求項5に記載の電動パワーステアリング装置。 - 前記モールドモジュールを固着している前記電動機のケースは、前記反減速機構側のケースである、
ことを特徴とする請求項5に記載の電動パワーステアリング装置。 - 前記モールドモジュールは、前記裏面から突出する凸部を備え、
前記伝熱樹脂は、前記電動機のケースと前記モールドモジュールの裏面との間に前記突部により形成される隙間内に充填されている、
ことを特徴とする請求項5乃至7のうちの何れか一項に記載の電動パワーステアリング装置。 - 前記伝熱樹脂内に混入されたフィラーを備え、
前記電動機のケースと前記モールドモジュールの裏面との間の隙間は、前記フィラーにより確保されている、
ことを特徴とする請求項5乃至8のうちの何れか一項に記載の電動パワーステアリング装置。 - 車両のステアリング軸に連結された減速機構と、前記減速機構に回転子軸が連結された電動機と、前記電動機の電機子巻線に供給する電力を制御して前記電動機に所定のトルクを発生させる電動機制御装置と、を備えた電動パワーステアリング装置であって、
前記電動機制御装置は、配線を形成する複数のターミナルと前記夫々のターミナルに実装された複数の電子部品とがモールド樹脂によりモールディングされ、且つ前記複数のターミナルの少なくとも一部分が前記モールド樹脂の裏面に露出してなるモールドモジュールを備え、
前記モールドモジュールは、前記裏面がセラミック製の絶縁シートを介して前記電動機のケースに固着されている、
ことを特徴とする電動パワーステアリング装置。 - 車両のステアリング軸に連結された減速機構と、前記減速機構に回転子軸が連結された電動機と、前記電動機の電機子巻線に供給する電力を制御して前記電動機に所定のトルクを発生させる電動機制御装置と、を備えた電動パワーステアリング装置であって、
前記電動機制御装置は、配線を形成する複数のターミナルと前記夫々のターミナルに実装された複数の電子部品とがモールド樹脂によりモールディングされ、且つ前記複数のターミナルの少なくとも一部分が前記モールド樹脂の裏面に露出してなるモールドモジュールと、ヒートシンクと、前記モールドモジュールと前記ヒートシンクを収納する制御装置ケースとを備え、
前記モールドモジュールは、前記裏面が伝熱樹脂を介して前記ヒートシンクに固着されている、
ことを特徴とする電動パワーステアリング装置。 - 前記制御装置ケースは、前記電動機の減速機構側のケースに固定されている、
ことを特徴とする請求項11に記載の電動パワーステアリング装置。 - 前記ヒートシンクは、前記減速機構側のケースに形成された減速機構側ケース開口部に対応する位置に形成されたヒートシンク開口部を備え、
前記電動機の電機子巻線に接続されたバスバーは、前記電動機の減速機構側のケース内部から前記減速機構側ケース開口部と前記ヒートシンク開口部とを介して前記制御装置ケース内部に延び、前記制御装置ケース内部で前記モールドモジュールに接続されている、
ことを特徴とする請求項11又は12に記載の電動パワーステアリング装置。 - 前記モールドモジュールは、前記裏面から突出する凸部を備え、
前記伝熱樹脂は、前記ヒートシンクと前記モールドモジュールの裏面との間に前記突部により形成される隙間内に充填されている、
ことを特徴とする請求項11乃至13のうちの何れか一項に記載の電動パワーステアリング装置。 - 前記伝熱樹脂内に混入されたフィラーを備え、
前記ヒートシンクと前記モールドモジュールの裏面との間の隙間は、前記フィラーにより確保されている、
ことを特徴とする請求項11乃至14のうちの何れか一項に記載の電動パワーステアリング装置。 - 車両のステアリング軸に連結された減速機構と、前記減速機構に回転子軸が連結された電動機と、前記電動機の電機子巻線に供給する電力を制御して前記電動機に所定のトルクを発生させる電動機制御装置と、を備えた電動パワーステアリング装置であって、
前記電動機制御装置は、配線を形成する複数のターミナルと前記夫々のターミナルに実装された複数の電子部品とがモールド樹脂によりモールディングされ、且つ前記複数のターミナルの少なくとも一部分が前記モールド樹脂の裏面に露出してなるモールドモジュールと、ヒートシンクと、前記モールドモジュールと前記ヒートシンクを収納する制御装置ケースとを備え、
前記モールドモジュールは、前記裏面がセラミック製の絶縁シートを介して前記ヒートシンクに固着されている、
ことを特徴とする電動パワーステアリング装置。 - 前記モールドモジュールは、直流電源からの直流電力を交流電力に変換して前記電機子巻線に供給する電力変換回路のパワー半導体チップを内蔵する、
ことを特徴とする請求項5乃至16のうちの何れか一項に記載の電動パワーステアリング装置。 - 前記モールドモジュールは、前記電動機を電源から遮断し得るリレー半導体チップを内蔵する、
ことを特徴とする請求項5乃至17のうちの何れか一項に記載の電動パワーステアリング装置。 - 前記電動機は、前記電動機制御装置を搭載した制御装置一体型電動機であり、
前記電動機制御装置は、前記電動機の回転子軸の軸心の延びる方向に配置されている、
ことを特徴とする請求項5乃至18のうちの何れか一項に記載の電動パワーステアリング装置。 - 前記電動機は、前記電動機制御装置を搭載した制御装置一体型電動機であり、
前記電動機制御装置は、前記電動機の回転子軸の軸心に並行する位置に配置されている、
ことを特徴とする請求項5乃至18のうちの何れか一項に記載の電動パワーステアリング装置。
Priority Applications (6)
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US13/983,727 US9123693B2 (en) | 2011-04-07 | 2011-04-07 | Mold module utilized as power unit of electric power steering apparatus and electric power steering apparatus |
CN201180068636.4A CN103402853B (zh) | 2011-04-07 | 2011-04-07 | 作为电动助力转向装置的功率部使用的模塑模块以及电动助力转向装置 |
EP11863213.2A EP2695795B1 (en) | 2011-04-07 | 2011-04-07 | Molded module and electric power steering apparatus |
JP2013508686A JP5705306B2 (ja) | 2011-04-07 | 2011-04-07 | 電動パワーステアリング装置のパワー部として用いるモールドモジュール、及び電動パワーステアリング装置 |
EP19169795.2A EP3536582B1 (en) | 2011-04-07 | 2011-04-07 | Mold module and electric power steering apparatus |
PCT/JP2011/058808 WO2012137333A1 (ja) | 2011-04-07 | 2011-04-07 | モールドモジュール、及び電動パワーステアリング装置 |
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EP (2) | EP2695795B1 (ja) |
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EP2695795A1 (en) | 2014-02-12 |
EP3536582A1 (en) | 2019-09-11 |
US20140151146A1 (en) | 2014-06-05 |
EP2695795B1 (en) | 2019-06-19 |
US9123693B2 (en) | 2015-09-01 |
EP2695795A4 (en) | 2015-07-08 |
JP5705306B2 (ja) | 2015-04-22 |
CN103402853A (zh) | 2013-11-20 |
EP3536582B1 (en) | 2022-08-10 |
JPWO2012137333A1 (ja) | 2014-07-28 |
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