Claims
[Claim 1] An integrated electric power steering apparatus,
comprising:
a motor; and
a control unit which is integrated with the motor, and is
configured to control the motor,
the control unit comprising:
an inverter circuit which comprises a plurality of
switching elements, and is configured to convert DC power supplied
from a power supply into AC power and to supply the converted AC
power to the motor by controlling each of the plurality of switching
elements;
a CPU configured to control each of the plurality of
switching elements; and
a wiring board on which the inverter circuit and the
CPU are mounted, the wiring board comprising an inverter-circuit
mounted surface on which the inverter circuit is mounted and an
inverter-circuit non-mounted surface opposed to the
inverter-circuit mounted surface,
the wiring board comprising a positive-side wiring pattern
configured to connect a positive side of the power supply and a
positive side of the inverter circuit to each other and a
negative-side wiring pattern configured to connect a negative side
of the power supply and a negative side of the inverter circuit
to each other, one of the positive-side wiring pattern and the negative-side wiring pattern being formed on a central side of the
wiring board and another thereof being formed on an outer periphery
side of the wiring board,
the plurality of switching elements being mounted between the
one wiring pattern and the another wiring pattern.
[Claim 2] The integrated electric power steering apparatus
according to claim 1, further comprising a rotation sensor, which
is mounted to the inverter-circuit mounted surface, and is
configured to detect an angle of rotation of the motor,
wherein the rotation sensor is surrounded by the
positive-side wiring pattern and the negative-side wiring pattern,
and the rotation sensor has an upper surface which is flush with
an upper surface of the positive-side wiring pattern and an upper
surface of the negative-side wiring pattern.
[Claim 3] The integrated electric power steering apparatus
according to claim 1 or 2, wherein the plurality of switching
elements have head portions which are flush with each other.
[Claim 4] The integrated electric power steering apparatus
according to any one of claims 1 to 3, further comprising:
a motor case configured to accommodate the motor; and
a frame, which is provided to the motor case, and is configured
to separate the motor to be accommodated in the motor case and the control unit from each other and enable dissipation of heat
generated from each of the plurality of switching elements,
wherein the control unit is provided so that each of head
portions of the plurality of switching elements is brought into
contact with the frame.
[Claim 5] The integrated electric power steering apparatus
according to claim 4,
wherein the frame is provided with a projecting portion which
enables dissipation of the heat generated from each of the plurality
of switching elements; and
wherein the control unit is provided so that each of the head
portions of the plurality of switching elements is brought into
contact with the projecting portion provided to the frame.
[Claim 6] The integrated electric power steering apparatus
according to any one of claims 1 to 5, further comprising a power
supply system component, which is to be used for connection between
the power supply and the inverter circuit, and is to be mounted
on the inverter-circuit mounted surface or the inverter-circuit
non-mounted surface.
[Claim 7] The integrated electric power steering apparatus
according to any one of claims 1 to 6, wherein the CPU is mounted
on the inverter-circuit mounted surface or the inverter-circuit non-mounted surface.
[Claim 8] The integrated electric power steering apparatus
according to any one of claims 1 to 7, wherein winding end portions
of windings of phases of the motor, which are to be connected to
the inverter circuit, are arranged on the wiring board.
[Claim 9] The integrated electric power steering apparatus
according to any one of claims 1 to 8,
wherein the motor comprises two sets of windings;
wherein the control unit comprises two inverter circuits; and
wherein the plurality of switching elements forming the
respective two inverter circuits are mounted in a separated manner
with respect to a central line passing through a center of the wiring
board as a boundary.
[Claim 10] The integrated electric power steering apparatus
according to claim 9, wherein a first winding end portion of the
two sets of windings, which is to be connected to one of the two
inverter circuits, and a second winding end portion to be connected
to another of the two inverter circuits are arranged on the wiring
board so as to be point-symmetric with respect to the center of
the wiring board over the phases.
[Claim 11] The integrated electric power steering apparatus according to any one of claims 1 to 10,
wherein the inverter circuit further comprises a capacitor,
and
wherein the capacitor is mounted across the one wiring pattern
and the another wiring pattern.