Drive unit of electric motor and motorized equipment using the drive unit
AssigneeDenso Corporation
InventorsNaoki Matsuda, Masashi Yamasaki
Life of this patent
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Abstract
A power module of a drive unit of an electric motor is formed by inserting multiple power transistors, which supply a drive current to a coil wound around a stator or a rotor, and wirings connecting the power transistors in a resin, which is formed in the shape of a plate, by resin molding. Electronic components such as aluminum electrolytic capacitors, a choke coil and a first connector are provided in a board thickness direction of the power module and are electrically connected with the wirings of the power module. Thus, a construction for electrically connecting the wirings of the power module formed by the resin molding and the electronic components can be simplified.
Claims9
A drive unit of an electric motor, which has a rotor rotatable relative to a stator, for rotating and driving the rotor relative to the stator, the drive unit comprising:
- a power module formed by inserting a plurality of power transistors, which supply a drive current to a coil wound around the stator or the rotor, and wirings connecting the power transistors in a resin, which is formed in the shape of a plate, by resin molding;
- and
- an electronic component provided in a board thickness direction of the power module and electrically connected with the wirings of the power module, wherein:
- the power transistors and the wirings connecting the power transistors are arranged on a same plane;
- the electronic component has lead wires extending from a main body thereof;
- and
- the lead wires pass through the power module in the board thickness direction of the power module and are electrically connected with the wirings of the power module inside holes formed on a side of the power module opposite to the main body of the electronic component.
A motorized equipment comprising:
- a stator;
- a rotor provided to be rotatable relative to the stator;
- a power module formed by inserting a plurality of power transistors, which supply a drive current to a coil wound around the stator or the rotor, and wirings connecting the power transistors in a resin, which is formed in the shape of a plate, by resin molding;
- an electronic component provided in a board thickness direction of the power module and electrically connected with the wirings of the power module;
- a control board provided in the board thickness direction of the power module and substantially parallel to the power module, the control hoard having a control circuit for controlling relative rotation drive between the stator and the rotor;
- and
- a heat sink provided on a side of the power module opposite to the control board for absorbing a heat generated by the power transistors, wherein:
- the power transistors and the wirings connecting the power transistors are arranged on a same plane;
- the electronic component is arranged inside the power transistor, which are arranged in outer edge portions on both sides of the power module formed substantially in the rectangular shape, and
- the heat sink has a plurality of columnar sections, which are thermally connected with radiation sections of the power transistors exposed from an outer wall of the power module in the board thickness direction of the power module, and a recess formed between the columnar sections for accommodating the electronic component.
A motorized equipment comprising:
- a stator;
- a rotor provided to be rotatable relative to the stator;
- a power module formed by inserting a plurality of power transistors, which supply a drive current to a coil wound around the stator or the rotor, and wirings connecting the power transistors in a resin, which is formed in the shape of a plate, by resin molding;
- an electronic component provided in a board thickness direction of the power module and electrically connected with the wirings of the power module, wherein:
- the power transistors and the wirings connecting the power transistors are arranged on a same plane;
- the electronic component has lead wires extending from a main body thereof;
- and
- the lead wires pass through the power module in the board thickness direction of the power module and are electrically connected with the wirings of the power module inside holes formed on a side of the power module opposite to the main body of the electronic component.
Dependencies are inferred from the claim text.