Brushless motor
AssigneeAsmo Co., Ltd.
InventorsMineo Yamaguchi, Hideto Matsuzaki, Keisuke Sasaki, Masaaki Shimizu, Shinji Iwama, Satoru Asai
Life of this patent
Estimating the term…
Abstract
A brushless motor includes a stator attached to a motor case and a rotor. A circuit substrate is attached to the motor case. The substrate includes an electric circuit, which supplies electric current to the stator thereby rotating the rotor. A fan generates and moves air in accordance with rotation of the rotor. A duct guides some of the air moved by the fan to the stator. A flange extends from the stator. The air guided by the duct flows along the flange. This structure reduces the size of the brushless motor while increasing its power.
Claims19
A brushless motor comprising:
- a motor case;
- a stator attached to the motor case;
- a rotor that rotates relative to the motor case;
- a circuit substrate attached to the motor case, wherein the circuit substrate includes an electrical circuit to supply a current to the stator to rotate the rotor;
- a fan for producing a flow of air in accordance with the rotation of the rotor;
- a duct for guiding some of the flow of air to that stator, wherein the duct has an inner wall;
- a radiator extending form the stator, wherein the air guided by the duct flows along the radiator;
- and
- a reservoir for receiving water droplets from the inner wall of the duct, the reservoir being located upstream the stator to prevent the droplets from reaching the stator.
A brushless motor comprising:
- a motor case;
- a stator attached to the motor case, wherein the stator includes a centerpiece, a core located about the centerpiece and a wire wound about the core;
- a rotor supported by the stator to be rotatable relative to the stator, wherein the rotor includes a rotary shaft rotatably supported by the centerpiece and a yoke fixed to the rotary shaft to surround the stator;
- a circuit substrate attached to the motor case, wherein the circuit substrate includes an electrical circuit to supply a current to the wire to rotate the rotor;
- a fan fixed to the rotary shaft, wherein the fan produces a flow of air in accordance with the rotation of the rotor;
- a duct for guiding some of the flow of air produced by the fan to the stator, wherein the duct has an inner wall;
- a heat-radiating flange formed on the centerpiece, wherein the flange is exposed to the air guided from the duct to the stator;
- and
- a reservoir for receiving water droplets from the inner wall of the duct, the reservoir being located upstream the stator to prevent the droplets from reaching the stator.
A brushless motor used in a fan of an on-vehicle air conditioner comprising:
- a motor case;
- a stator attached to the motor case, wherein the stator includes a centerpiece, a core located about the centerpiece and a wire wound around the core;
- a rotor supported by the stator to be rotatable relative to the stator, wherein the rotor includes a rotary shaft rotatably supported by the centerpiece and a yoke fixed to the rotary shaft to surround the stator;
- a circuit substrate attached to the motor case, wherein the circuit substrate includes an electrical circuit to supply a current to the wire to rotate the rotor;
- a fan fixed to the rotary shaft, wherein the fan produces a flow of air in accordance with the rotation of the rotor;
- a dividing duct for guiding some of the flow of air produced by the fan to the stator, wherein the duct has an inner wall;
- a heat-radiating flange formed on the centerpiece, wherein the flange is exposed to the air guided from the duct to the stator;
- and
- a reservoir for receiving water droplets from the inner wall of the dividing duct and located below the dividing duct and upstream the flange of the centerpiece to prevent the droplets from reaching the stator.
Dependencies are inferred from the claim text.