Manufacturing method of bus bar unit, bus bar unit, and motor
AssigneeNidec Corporation
InventorRyo Kamizato
Life of this patent
Estimating the term…
Abstract
A method of manufacturing of the bus bar assembly includes preparing a mold, positioning a bus bar and a shield in the mold, and molding a bus bar holder. The positioning includes inserting first positioning pins into bus bar through holes to cause the first positioning pins to hold the bus bar, providing the shield in the mold in a state where a lower surface of the shield and a distal end of the first positioning pin are in contact with each other, bringing a second positioning pin into contact with an upper surface of the shield and positioning the shield in a vertical direction, and bringing a third positioning pin extending downward from a lower surface of an upper mold into contact with an upper surface of the bus bar to position the bus bar in the vertical direction.
Claims14
A manufacturing method of a bus bar assembly to connect between a coil in a motor and an external power source;
- the bus bar assembly including a bus bar made of a conductor, a shield to shield magnetism generated by the bus bar, and a bus bar holder to hold the bus bar and the shield, the conductor and the shield each being plate-shaped;
- the bus bar including a bus bar body portion held by the bus bar holder in a posture in which a plate surface is directed in a vertical direction, and bus bar through holes penetrating the bus bar in a plate thickness direction, the bus bar body portion being arc-shaped;
- and
- the shield including a portion overlapping the bus bar through holes when viewed from the vertical direction;
- the method comprising:
- preparing a mold to insert-mold the bus bar and the shield;
- positioning the bus bar and the shield in the mold;
- and
- injecting a resin into the mold to mold the bus bar holder after the positioning;
- wherein the positioning includes:
- inserting first positioning pins extending upward from an upper surface of a lower mold of the mold into the bus bar through holes to cause the first positioning pins to hold the bus bar;
- arranging the shield in the mold in a state where a lower surface of the shield and a distal end of the first positioning pin are in contact with each other;
- bringing a second positioning pin extending downward from a lower surface of an upper mold of the mold into contact with an upper surface of the shield and positioning the shield in the vertical direction;
- and
- bringing a third positioning pin extending downward from the lower surface of the upper mold into contact with an upper surface of the bus bar to position the bus bar in the vertical direction.
A bus bar assembly applicable to connection between a coil in a motor and an external power source, the bus bar assembly comprising:
- a bus bar made of a conductor, the conductor being plate-shaped;
- a shield to shield magnetism generated by the bus bar, the shield being plate-shaped;
- and
- a bus bar holder to hold the bus bar and the shield;
- wherein
- the bus bar includes a bus bar body portion held by the bus bar holder in a posture in which a plate surface is directed in a vertical direction, and bus bar through holes penetrating the bus bar in a plate thickness direction, the bus bar body portion being arc-shaped;
- the shield includes a portion overlapping the bus bar through holes when viewed from the vertical direction;
- and
- the bus bar holder includes:
- first pin insertion holes that are open in a lower surface of the bus bar holder, extend upward, pass through the bus bar through holes, and reach a lower surface of the shield;
- a second pin insertion hole that opens in an upper surface of the bus bar holder, extends downward, and reaches an upper surface of the shield;
- and
- a third pin insertion hole that opens in the upper surface of the bus bar holder, extends downward, and reaches the upper surface of the bus bar.
A motor comprising:
- a rotor rotatable about a center axis extending in a vertical direction;
- an annular stator located on a radial outside of the rotor;
- and
- a rotation position detector located above the stator to detect a rotation position of the rotor;
- wherein
- the stator includes a stator body including a coil and a stator core, and a bus bar assembly located between the stator core and the rotation position detector;
- the bus bar assembly includes a bus bar made of a conductor, a shield to shield magnetism generated by the bus bar, and a bus bar holder to hold the bus bar and the shield, the conductor and the shield each being plate-shaped;
- the bus bar includes a bus bar body portion held by the bus bar holder in a posture in which a plate surface is directed in the vertical direction, bus bar through holes penetrating the bus bar in a plate thickness direction, and a coil wiring portion and an external power source wiring portion respectively extending from different end portions of the bus bar body portion, the bus bar body portion being arc-shaped;
- the shield includes through hole shielding portions that individually overlap the bus bar through holes when viewed from the vertical direction;
- the external power source wiring portion extends linearly from the end portion of the bus bar body portion to an outer peripheral side when viewed from the vertical direction, and is provided along a width direction of the external power source wiring portion;
- and
- some of the through hole shielding portions are located in the external power source wiring portion, and others of the through hole shielding portions are located in the bus bar body portion or the coil wiring portion.
Dependencies are inferred from the claim text.