Brushless motor having water draining portion
First Claim
1. A brushless motor comprising:
- a motor holder including a stator secured thereto, said stator rotatably supporting a rotor, said motor holder having a circuit board connected thereto, said circuit board having an excitation circuit for supplying exciting current to said stator; and
a case connected to said motor holder, said case covering said circuit board and defining a ventilation chamber in cooperation with said motor holder, said ventilation chamber including an air inlet portion, an air outlet portion and a water draining portion, said air inlet portion being in communication with an atmosphere, said air outlet portion being in communication with said stator, said water draining portion draining water introduced into said ventilation chamber out of said brushless motor, said brushless motor providing a flow of cooling air passing through said ventilation chamber via said air inlet portion and said air outlet portion toward said stator for cooling heat generated during rotation of said rotor, at least one of said motor holder and said case having one or more guide ribs arranged in said ventilation chamber to define an air passage for guiding said cooling air from said air inlet portion to said air outlet portion, said water draining portion being located outside of said air passage.
1 Assignment
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Accused Products
Abstract
A brushless motor includes a motor holder and a case connected thereto. A ventilation chamber is defined between the motor holder and the case. The ventilation chamber includes an air inlet portion, an air outlet portion and water draining portions. The air inlet portion is in communication with the atmosphere. The air outlet portion is in communication with a stator. The water draining portions drain water introduced into the ventilation chamber out of the motor. The motor provides a flow of cooling air passing through the ventilation chamber toward the stator for cooling heat generated during rotation of a rotor. The motor holder and the case have guide ribs arranged in the ventilation chamber to define an air passage for guiding the cooling air from the air inlet portion to the air outlet portion. The water draining portions are located outside of the air passage.
13 Citations
7 Claims
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1. A brushless motor comprising:
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a motor holder including a stator secured thereto, said stator rotatably supporting a rotor, said motor holder having a circuit board connected thereto, said circuit board having an excitation circuit for supplying exciting current to said stator; and
a case connected to said motor holder, said case covering said circuit board and defining a ventilation chamber in cooperation with said motor holder, said ventilation chamber including an air inlet portion, an air outlet portion and a water draining portion, said air inlet portion being in communication with an atmosphere, said air outlet portion being in communication with said stator, said water draining portion draining water introduced into said ventilation chamber out of said brushless motor, said brushless motor providing a flow of cooling air passing through said ventilation chamber via said air inlet portion and said air outlet portion toward said stator for cooling heat generated during rotation of said rotor, at least one of said motor holder and said case having one or more guide ribs arranged in said ventilation chamber to define an air passage for guiding said cooling air from said air inlet portion to said air outlet portion, said water draining portion being located outside of said air passage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification