Control unit and method of manufacturing the same
AssigneeOMRON Corporation
InventorKanji Takagi
Life of this patent
Estimating the term…
Abstract
A drive circuit 12 is mounted on a metal substrate 50, a control circuit 13 is mounted on an insulating substrate 70, and a large current circuit component such as an electrolytic condenser 18 is mounted on a baseboard 30 integrated with a metallic circuit conductor constituent member 31 by insert molding, in which the metal substrate 50 and the insulating substrate 70 are laminated on the baseboard 30.
Claims19
A control unit for an electric power steering device having an assist motor linked to a steering system of a vehicle to generate a steering auxiliary torque, said control unit comprising:
- a drive circuit having a switching element for switching a connection of each coil terminal of said assist motor to a high potential power line or a low potential power line;
- a control circuit for controlling an operation of said switching element of said drive circuit to control an operation of said assist motor;
- a large current circuit component containing a power back-up capacitor connected to the high potential power line;
- a metal substrate having said drive circuit mounted on one surface thereof;
- an insulating substrate having said control circuit mounted on one surface thereof;
- and
- a baseboard having a metallic circuit conductor constituent member integrated with a resin base substance by insert molding and having said large current circuit component mounted;
- wherein said metal substrate and said insulating substrate are attached on said baseboard to overlap each other.
A control unit for an electric power steering device having an assist motor linked to a steering system of a vehicle to generate a steering auxiliary torque, said control unit comprising:
- a breather space partitioned from an inside of the control unit;
- an outside vent hole for communicating said breather space to an outside of the control unit with a smaller cross sectional area than that of said breather space;
- and
- an inside vent hole for communicating said breather space into the control unit and fitted with a filter porous to air but impervious to water.
A vehicle comprising a control unit, the control unit comprising:
- a breather space partitioned from an inside of the control unit;
- an outside vent hole for communicating said breather space to an outside of the control unit with a smaller cross sectional area than that of said breather space;
- and
- an inside vent hole for communicating said breather space into the control unit and fitted with a filter porous to air but impervious to water.
A method of manufacturing a control unit for an electric power steering device having an assist motor linked to a steering system of a vehicle to generate a steering auxiliary torque, said control unit having a drive circuit having a switching element for switching a connection of each coil terminal of said assist motor to a high potential power line or a low potential power line, a control circuit for controlling an operation of said switching element of said drive circuit to control an operation of said assist motor, and a large current circuit component containing a power back-up capacitor connected to the high potential power line, said method comprising:
- mounting the drive circuit on one surface of a metal substrate;
- mounting the control circuit on one surface of an insulating substrate;
- forming a baseboard having a metallic circuit conductor constituent member integrated with a resin base substrate by an insert molding;
- mounting the large current circuit component on the baseboard;
- attaching the metal substrate and the insulating substrate on the baseboard to overlap each other.
Dependencies are inferred from the claim text.