Low noise ventilation system for electric motor
First Claim
1. An electric motor having a ventilation system which inhibits generation of noise, the motor comprising:
- a housing defined by a hollow casing;
a stator secured in the housing;
a rotor and a rotor shaft mounting the rotor for rotation in the housing about an axis;
a fan mounted on said rotor shaft for rotation to advance a flow of cooling air through the housing to cool the motor, the fan having a plurality of blades; and
a baffle secured in the housing at a position generally between the stator and the fan, the baffle including an annular section, the annular section including an inner edge defined by a lip, the lip having a curved convex surface.
2 Assignments
0 Petitions
Accused Products
Abstract
An electric motor having a fan and baffle for directing a flow of cooling air through the motor while minimizing generation of noise. The fan has blades which are curved in a direction opposite to the direction of rotation of the fan. The blades are spaced from a hub of the fan thereby forming a clearance region to inhibit air flow shear and turbulence. The baffle has an annular shape with upstream and downstream faces for directing air flow. The downstream face is inclined so that air flowing along its surface has a component of motion in the downstream direction to inhibit separation of flow from the surface. The baffle is received in a casing of the motor with a slip fit.
67 Citations
20 Claims
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1. An electric motor having a ventilation system which inhibits generation of noise, the motor comprising:
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a housing defined by a hollow casing; a stator secured in the housing; a rotor and a rotor shaft mounting the rotor for rotation in the housing about an axis; a fan mounted on said rotor shaft for rotation to advance a flow of cooling air through the housing to cool the motor, the fan having a plurality of blades; and a baffle secured in the housing at a position generally between the stator and the fan, the baffle including an annular section, the annular section including an inner edge defined by a lip, the lip having a curved convex surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An electric motor having a ventilation system which inhibits generation of noise, the motor comprising:
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a housing defined by a hollow casing; a stator secured in the housing; a rotor and a rotor shaft mounting the rotor for rotation in the housing about an axis; a fan mounted on said rotor shalt for rotation to advance a flow of cooling air through the housing to cool the motor, the fan having a plurality of blades; and a baffle secured in the housing at a position between the stator and the fan, the baffle having positioned generally at an outer periphery of the baffle, the rim having at least one tab configured for being received in a corresponding hole in the casing to releasably secure the baffle in the casing.
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- 17. An electric motor having a ventilation system, the motor comprising a housing, a stator secured in the housing, a rotor and a rotor shaft mounting the rotor for rotation in the housing about an axis, a fan mounted on the rotor shaft for rotation to advance a flow of cooling air through the housing to cool the motor, the fan having a central hub and a plurality of blades, the blades of the fan being spaced from the hub to form a clearance region between the hub and the blades, and a baffle secured in the housing at a position generally between the stator and the fan, the baffle having an annular shape, and a central opening, and at surrounding the central opening, the lip having a curved convex surfaces a curved portion of the baffle extending radially inward from the housing and positioned axially above a portion of the fan forming an axial gap between said curved portion of the baffle and said portion of the fan.
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20. An electric motor having a ventilation system which inhibits generation of noise, the motor comprising a housing defined by a hollow casing, a stator secured in the housing, a rotor and a rotor shaft mounting the rotor for rotation in the housing about an axis, a fan mounted on said rotor shaft for rotation to advance a flow of cooling air through the housing to cool the motor, the fan having a plurality of blades, and a baffle secured in the housing at a position between the stator and the fan, the baffle including an annular section, a central opening and a lip surrounding the central opening, the lip having a curved convex surface, the blades of the fan having a shape corresponding to the curved convex surface of the lip.
Specification