Motor for electric power steering and method for manufacturing the same
AssigneeHitachi, Ltd.
InventorsMasamichi Yagai, Mitsuaki Mirumachi, Toshiaki Ueda, Shin Onose
Life of this patent
Estimating the term…
Abstract
A small-sized motor for electric power steering, in which coil connection can be easily performed with space saving, and a method for manufacturing the motor. Multi-phase stator coils assembled in a stator coil are connected per phase by connecting rings at coil ends of the stator coils. A bus bar supplied with electric power from the exterior is stacked onto the connecting rings in the axial direction of the motor and is electrically connected to the connecting rings.
Claims15
A motor for electric power steering, the motor comprising:
- a stator;
- and
- a rotor rotatably supported and disposed opposite to said stator with a gap left therebetween,
- said stator comprising:
- a stator core;
- multi-phase stator coils assembled in said stator core;
- and
- a wiring member electrically connected to said stator coils and supplied with electric power from the exterior,
- said wiring member comprising:
- a first wiring member for connecting said stator coils per phase;
- and
- a second wiring member supplied with electric power from the exterior,
- said first wiring member and said second wiring member being stacked in an axial direction of the motor and electrically connected to each other.
A motor for electric power steering, the motor comprising:
- a stator;
- and
- a rotor rotatably supported and disposed opposite to said stator with a gap left therebetween,
- said stator comprising:
- a stator core;
- multi-phase stator coils assembled in said stator core;
- and
- a wiring member electrically connected to said stator coils and supplied with electric power from the exterior,
- said wiring member comprising:
- a first wiring member for connecting said stator coils per phase;
- and
- a second wiring member supplied with electric power from the exterior,
- said first wiring member and said second wiring member being stacked in an axial direction of the motor and electrically connected to each other,
- said stator core, said stator coils, and said wiring member being molded with a molding material, and
- said stator core having a surface which is opposite to said rotor and is subjected to cutting.
A motor for electric power steering, which is controlled by a power converter for converting electric power obtained from a 14V or 42V onboard power supply system to multi-phase AC power and outputting the multi-phase AC power, and which outputs steering torque, the motor comprising:
- a stator;
- and
- a rotor rotatably supported and disposed opposite to said stator with a gap left therebetween,
- said stator comprising:
- a stator core;
- multi-phase stator coils assembled in said stator core;
- and
- a wiring member electrically connected to said stator coils and supplied with electric power from the exterior,
- said wiring member comprising:
- a first wiring member for connecting said stator coils per phase;
- and
- a second wiring member supplied with electric power from the exterior,
- said first wiring member and said second wiring member being stacked in an axial direction of the motor and electrically connected to each other,
- said stator core comprising:
- an annular core portion;
- and
- a plurality of teeth core portions radially projecting from said annular core portion,
- adjacent two of the plurality of teeth core portions of said stator core forming a slot therebetween,
- said stator coils being assembled in said stator core with winding conductors of said stator coils accommodated in said slots, and
- said winding conductors being each made of a wire with a diameter larger than a circumferential spacing between respective edges of said adjacent two teeth core portions which are closest to each other in the circumferential direction.
A method of manufacturing a motor for electric power steering, which is driven by multi-phase AC power and outputs steering torque, the method comprising:
- a first step of assembling stator coils in a stator core;
- a second step of connecting said stator coils per phase by a first wiring member at coil ends of said stator coils which are axially projected from an axial end of said stator core including said stator coils assembled therein;
- and
- a third step of axially stacking a second wiring member, which is supplied with electric power from the exterior, onto said first wiring member and electrically connected said second wiring member to said first wiring member.
A method of manufacturing a motor for electric power steering, which is driven by multi-phase AC power and outputs steering torque, the method comprising:
- a first step of assembling stator coils in a stator core;
- a second step of connecting said stator coils per phase by a first wiring member at coil ends of said stator coils which are axially projected from an axial end of said stator core including said stator coils assembled therein;
- a third step of axially stacking a second wiring member, which is supplied with electric power from the exterior, onto said first wiring member and electrically connected said second wiring member to said first wiring member;
- and
- a fourth step of molding said stator core, said stator coils, and said first and second wiring members with a molding material.
A method of manufacturing a motor for electric power steering, which is driven by multi-phase AC power and outputs steering torque, the method comprising:
- a first step of assembling stator coils in a stator core;
- a second step of electrically connecting coil ends of said stator coils, which are axially projected from an axial end of said stator core including said stator coils assembled therein, to a first wiring member assembled in the coil end side of said stator core in an axial direction of the motor;
- and
- a third step of electrically connecting a second wiring member, which is assembled in the coil end side of said stator core in the axial direction of the motor, to said first wiring member, thereby forming a wiring connecting portion in an axially stacked multi-layered structure.
Dependencies are inferred from the claim text.