An electric power steering removes external wiring connecting between an electric motor and a control unit, whereby the influence of radiation noise caused by a PWM operation can be reduced. In addition, the heat radiation and assemblability of the electric motor and the control unit can be improved
An electric power steering removes external wiring connecting between an electric motor and a control unit, whereby the influence of radiation noise caused by a PWM operation can be reduced. In addition, the heat radiation and assemblability of the electric motor and the control unit can be improved, while achieving high power output. A housing 64 with a metal substrate 61 fixedly secured thereto is arranged at a side opposite to an electric motor 30. The cooling fins are formed on an outer side of a housing 64 and on an outer side and an inner side of a cover 65. A metal substrate 61, a large current substrate 62 and a control substrate 63 are arranged inside of the housing 64 and the cover 65 in a laminated structure.
대표청구항▼
1. An electric power steering apparatus equipped with an electric motor adapted to output assist torque to a steering wheel of a vehicle, and a control unit for controlling the driving of said electric motor,said control unit comprising: a power substrate mounting thereon a bridge circuit which incl
1. An electric power steering apparatus equipped with an electric motor adapted to output assist torque to a steering wheel of a vehicle, and a control unit for controlling the driving of said electric motor,said control unit comprising: a power substrate mounting thereon a bridge circuit which includes a plurality of semiconductor switching elements for switching current supplied to said electric motor in accordance with a torque assisting said steering wheel; capacitors for absorbing ripples contained in said current; a control substrate mounting thereon a microcomputer which generates a drive signal for controlling said bridge circuit based on at least steering torque of said steering wheel; a power connector electrically connected to a battery of the vehicle; a signal connector adapted to input and output signals through external wiring; a plurality of motor terminals electrically connected with said electric motor; a large current substrate mounting thereon at least said capacitors and having conductive plates forming wiring patterns and said motor terminals insert molded thereto with an insulating resin; and a housing and a cover in which said power substrate, said control substrate and large current substrate are received; wherein said power substrate, said power connector and said signal connector are arranged in said housing in parallel with each other in an axial direction of said electric motor, with said motor terminals being protruded outward from said cover, wherein said cover is fixedly secured to said housing in parallel to the axial direction of said electric motor, and said motor terminals are inserted into said electric motor and electrically connected with said electric motor. 2. The electric power steering apparatus according to claim 1, wherein said conductive plates connected with said power connector are arranged in parallel with each other substantially in the center of said large current substrate, and said capacitors are arranged at the opposite side of said motor terminals with said conductive plates interposed therebetween.3. The electric power steering apparatus according to claim 1, wherein said electric motor comprises a three-phase brushless motor, and switches each for switching on and off a current supplied to said three-phase brushless motor through said motor terminals are arranged in at least two ones of three parallel paths connecting between said three-phase brushless motor and said bridge circuit.4. The electric power steering apparatus according to claim 3, wherein said switches are arranged in those two ones of the three parallel paths which are arranged on opposite outer sides.5. The electric power steering apparatus according to claim 3, wherein said switches are connected with said paths by welding, with their welding locations being arranged at a side opposite in a diametral direction of said electric motor to that side at which said switches are connected with said motor terminals.6. The electric power steering apparatus according to claim 1, wherein said power substrate is fixedly secured to said housing while being covered with said large current substrate, and said power substrate is of a laminated structure of three layers in which said large current substrate and said control substrate are superposed on said power substrate in this order in a direction toward said cover, said cover being fixed to said housing to form an internally sealed structure, and said housing and said cover have their mating surfaces located at a power substrate side of the control substrate.7. The electric power steering apparatus according to claim 1, wherein each of said motor terminals has a narrow low-rigidity portion formed at its intermediate portion.8. An electric power steering apparatus equipped with an electric motor adapted to output assist torque to a steering wheel of a vehicle, and a control unit for controlling the driving of said electric motor,said control unit comprising: a power substrate mounting thereon a bridge circuit which includes a plurality of semiconductor switching elements for switching current supplied to said electric motor in accordance with a torque assisting said steering wheel; capacitors for absorbing ripples contained in said current; a control substrate mounting thereon a microcomputer which generates a drive signal for controlling said bridge circuit based on at least steering torque of said steering wheel; a power connector electrically connected to a battery of the vehicle; a signal connector adapted to input and output signals through external wiring; a plurality of motor terminals electrically connected with said electric motor; a large current substrate mounting thereon at least said capacitors and having conductive plates forming wiring patterns and said motor terminals insert molded thereto with an insulating resin; and a housing and a cover in which said power substrate, said control substrate and large current substrate are received; wherein said power substrate, said power connector and said signal connector are arranged in said housing hi parallel with each other in an axial direction of said electric motor, with said motor terminals being protruded outward from said cover, wherein said cover is formed with an opening through which said motor terminals are exposed outwardly from said cover, with a lid of an insulating resin being attached to an outer side of said cover, said lid having a plurality of penetration holes through which said motor terminals are able to extend. 9. The electric power steering apparatus according to claim 8, wherein an adhesive resin is filled into a gap between the outer periphery of said cover and said opening and surroundings of those portions of said motor terminals which are protruded from said cover.10. The electric power steering apparatus according to claim 8, wherein said electric motor comprises a three-phase brushless motor, and said lid is formed with a connector housing of a sensor connector which is connected with a rotational position sensor for detecting a rotational position of a rotor of said brushless motor.11. The electric power steering apparatus according to claim 10, wherein a plurality of sensor terminals connecting between said microcomputer and said rotational position sensor are insert molded to said large current substrate, and said connector housing is formed with a plurality of penetration holes through which one end portions of said sensor terminals extend, the one end portions of said sensor terminals being inserted into said penetration holes thereby to construct said sensor connector.12. The electric power steering apparatus according to claim 11, wherein said large current substrate has a first concave portion formed at a location adjacent the one end portions of said sensor terminals, and said lid has a convex portion which is formed at a location including said penetration holes for said sensor terminals, and into which said first concave portion is inserted with a gap formed therebetween, an adhesive resin being filled into said gap.13. The electric power steering apparatus according to claim 12, wherein said large current substrate has a second concave portion which is formed in the neighborhood of said first concave portion, and into which said adhesive resin is able to flow.14. The electric power steering apparatus according to claim 8, wherein said lid has vent holes formed therethrough for fluid communication with an ambient atmosphere.15. The electric power steering apparatus according to claim 14, wherein said vent holes are equipped with a filter which permits the passage of air but blocks the passage of water.16. The electric power steering apparatus according to claim 15, wherein said vent holes are formed at locations protruded from a surface of an adhesive resin bonding said cover and said lid with each other.17. The electric power steering apparatus according to claim 14, wherein said lid is formed with a wall which protrudes from a surface of an adhesive resin bonding said cover and said lid with each other, and said vent holes are formed inside said wall.18. The electric power steering apparatus according to claim 8, wherein a nut is insert molded to said lid at a location at which said lid is electrically connected with said electric motor.
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