Inverter-integrated driving module

摘要

A first inverter ventilation aperture is disposed so as to pass through a portion of a fin base that faces a bearing, a first rotor ventilation aperture is disposed so as to pass through a portion of a bottom surface portion that faces the bearing, and a first cooling airflow ventilation channel is formed in which a cooling airflow flows radially inward through radiating fins, then flows toward a first surface side of a mount portion through the first inverter ventilation aperture, flows axially through an interior portion of a stator core, and then flows out between the bottom surface portion and a base portion through the first rotor ventilation aperture, and subsequently flows radially outward between the bottom surface portion and the base portion due to rotational driving of a centrifugal fan.

主权项

1. An inverter-integrated driving module comprising:
a motor comprising:
a stator comprising:
an annular stator core in which slot portions are arranged in a row circumferentially so as to have openings on an outer circumferential side; anda stator coil that is mounted onto said stator core;a bearing box that is held by said stator core at a central axial position of said stator core by means of radial ribs;a rotor comprising:
a cylindrical rotor yoke portion;a bottom surface portion that is disposed so as to extend radially inward from a first end of said rotor yoke portion; anda plurality of magnetic poles that are disposed on an inner circumferential surface of said rotor yoke portion such that North-seeking (N) poles and South-seeking (S) poles are arranged in a row so as to alternate circumferentially,wherein said bottom surface portion is fixed to a shaft that is supported by a bearing that is housed in said bearing box, and said rotor yoke portion is mounted so as to be coaxial with said stator so as to envelop said stator core; a fan that is disposed on a first axial end of said rotor so as to face said bottom surface portion so as to be able to rotate together with said rotor; and an inverter module comprising:
a heatsink comprising:
a tabular fin base; anda plurality of radiating fins that are each disposed so as to stand perpendicularly on a rear surface of said fin base so as to extend radially and that are arranged in a row circumferentially; anda plurality of inverter units that are each mounted so as to be positioned on a region of a front surface of said fin base that corresponds to where said radiating fins are disposed, said plurality of inverter units supplying alternating-current power to said stator coil, wherein: said motor is mounted to a bracket by fixing said stator core to a first surface of a tabular mount portion of said bracket; said inverter module is mounted to said bracket such that said radiating fins face toward a second surface of said mount portion by fixing said fin base to said mount portion by means of a spacer; a first inverter ventilation aperture is disposed so as to pass through a portion of said bracket that faces said bearing; a first rotor ventilation aperture is disposed so as to pass through a portion of said bottom surface portion that faces said bearing; and a first cooling airflow ventilation channel is formed that comprises:
a radial ventilation channel that is formed between adjacent radiating fins so as to communicate between said first inverter ventilation aperture and a radially outer side of said heatsink, and through which a cooling airflow flows radially due to rotational driving of said fan; andan axial ventilation channel that is formed inside said stator core so as to communicate between said first inverter ventilation aperture and said first rotor ventilation aperture, and through which said cooling airflow flows axially.