Rotor core, outer rotor motor, driving motor for electric vehicle and manufacturing method

Abstract

The invention discloses a rotor core, which is an annular structure formed by splicing a plurality of arc-shaped core units. Each core unit has splicing surfaces which are attached to adjacent core units, and the splicing surfaces are located at the centers of magnetic insulation magnetic bridges. The rotor core of the invention adopts a splicing block structure, which can improve the material utilization rate and reduce the material cost; at the same time, splicing joints are disposed at the centers of the magnetic insulation magnetic bridges of permanent magnets and the welding slots are arranged at both ends of the splicing joints. After splicing, the magnetic circuit integrity of the rotor core is ensured, the structural strength is ensured, and the magnetic permeability and mechanicalproperties of the rotor core are not affected. The invention also discloses an outer rotor motor, a driving motor for an electric vehicle and a method for manufacturing the rotor core.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular, the invention relates to a rotor core, an outer rotor motor, a driving motor for an electric vehicle and a method for manufacturing the rotor core. Background technique [0002] Most of the rotor cores of existing motors are formed by lamination and riveting of integral circular rotor punches. The rotor punches are mainly punched with the remaining material in the inner ring of the stator punches. Carry out matching punching. [0003] However, in order to reduce the cost of the product and save materials, the block-type stator core began to be used in large quantities. The block-type stator core is mostly punched separately, and no remaining inner ring material is used for rotor punching. The integral rotor punching is performed separately. Excessive blanking will lead to low material utilization and waste raw materials. [0004] Especially in the field of permanent magnet drive m...

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Problems solved by technology

[0003] However, in order to reduce the cost of the product and save materials, the block-type stator core began to be used in large quantities. The block-type stator core is mostly punched separately, and no remaining inner ring material is used for rotor punching. The integral rotor punching is performed separately. The blanking will lead to low material utilization and waste of raw materials

[0004] Especially in the field of permanent magnet drive motors for electric vehicles, with the increasing demand for high-power motors, the outer diameter of the motor and the outer diameter of the rotor core also increase, and the aperture of the output shaft is larger, resulting in integral The material utilization of the rotor core is further reduced

In the field of external rotor motors, due to its structural characteristics, the rotor is located on the outer ring of the stator, and the material utilization rate of the integral rotor core is also low

[0005] In addition, in the production process of the motor, the scrap rate of the rotor core is generally higher than that of the stator core, but for matching, the production of the rotor core is also required separately, which further reduces the utilization rate of materials and leads to an increase in material costs

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