# US 4,391,570 A · Apparatus for cooling a ceiling mounted fan motor

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- Number: US 4,391,570 A
- Document ID: US4391570A
- Status: Granted
- Kind: A
- Application number: 06/258,669
- Filed: 1981-04-29
- Granted: 1983-07-05
- Earliest claimed: 1981-04-29
- Inventors: Clarence Stutzman
- Web page: https://patentgrep.com/patent/US4391570A

## CPC

- F04D 25/082: {the unit having provision for cooling the motor}
- F04D 25/088: {Ceiling fans}
- F04D 29/5806: {Cooling the drive system}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

An apparatus (10) for cooling a ceiling mounted room fan motor (11) having a rotatable shaft (24) and a motor housing (12) includes a flywheel (13) supported upon and rotating with the shaft (24) and a fan assembly (14). Motor housing (12) has a cylindrical side (15) and substantially circular end plates (18, 19) which together completely seal all windings of fan motor (11) therewithin and preclude entry of and contamination by environmental particulate pollutants. Fan assembly (14), similar to that of a squirrel cage fan, is substantially cylindrical, surrounds motor housing (12), and is operatively connected with flywheel (13) to rotate with the shaft (24), all energy for operation of fan assembly (14) being provided by fan motor (11).

## Claims

### Claim 1

An apparatus for cooling a motor having a housing within which all windings are enclosed, the housing having a substantially cylindrical side and two end plates, each end plate having bearing means mounted centrally therein, the motor having a rotatable shaft journaled in the bearing means, comprising:
annular top cap means in concentrically fixed spatial relation with one of the end plates, annular bottom cap means in concentrically rotatable spatial relation with the other of the end plates, fan means for simultaneously drawing cooling air through the inner peripheries of said top and bottom cap means in the vicinity of said bearing means, across both ends of the housing and the side of the housing and forceably discharging said air laterally away from the side of the housing.

### Claim 2 (depends on 1)

An apparatus for cooling a motor, as set forth in claim 1, said fan means being substantially cylindrical and surrounding the housing, and being operatively connected to rotate with said shaft.

### Claim 3 (depends on 2)

An apparatus for cooling a motor, as set forth in claim 2, further including flywheel means supported upon and rotating with said shaft, said annular bottom cap means operatively connecting said flywheel means to said fan means.

### Claim 4 (depends on 3)

An apparatus for cooling a motor, as set forth in claim 3, wherein all energy for operating said fan means is provided by the motor.

### Claim 5 (depends on 4)

An apparatus for cooling a motor, as set forth in claim 4, wherein said fan means includes a plurality of fan blades whose longitudinal axis is parallel to that of said shaft and which said fan blades are perpendicularly fixed between annular disc means.

### Claim 6 (depends on 5)

An apparatus for cooling a motor, as set forth in claim 5, wherein the plane of each said fan blade is angularly oriented with respect to the radial plane passing through the longitudinal axis of said shaft and the radially innermost edge of each said fan blade, said plurality of fan blades together with said annular disc means defining a squirrel cage fan blower.

### Claim 7 (depends on 6)

An apparatus for cooling a motor, as set forth in claim 6, wherein all the motor windings are completely sealed within the motor housing.

### Claim 8 (depends on 7)

An apparatus for cooling a motor, as set forth in claim 7, wherein the motor is ceiling mounted for operating a room fan, said fan means discharging said cooling air such that heat generated by the motor does not directly enter the air circulation flow established in the vicinity of said room fan.