US727685A - Cooling dynamo-electric machines. - Google Patents

Description

No. 727,685. PATENTED MAY 12, 1903. E. 1). PRIEST.

COOLING DYNAMO ELECTRIC MACHINES.

APPLICATION FILED NOV. 2, 1900.

N0 MODEL.

CO .Q Q Q M z d m j H z: K

a 3 sh \D 6 z Witnesses. Inventor. 2 5 Edward D.'Pr;est,

W MM I Atty.

m: NORRvs PETERS (:0 moroumo WASHVNDTDN, 0.0.

No. 727,685. I UNITED STATES PATENT Patented May 12, 1903.

OFFICE.

EDWARD D. PRIEST, OF SOHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

COOLING DY-NAMO ELECTRlC MACHINES.

SPECIFICATION forming part of Letters Patent No. 727,685, dated May 12, 1903.

Application filed November 2. 1900. Serial noisazse. (No model.)

To aZZ whom it may concern:

Be it known that I, EDWARD D. PRIEST, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certainnew anduseful Improvements in Cooling Dynamo-Electric Machines, of which the following is a specification.

My invention relates to means for cooling 1 o dynamo-electric machines, and especially railway-motors, in order to prevent overheating of the armature or rotary member and the other parts of the motor.

It consists in devices for causing air toenter I 5 at one end of the motor, preferably the pinion end, and to pass through it to the other end through longitudinal ducts formed in the core and radial air-passages formed in the core and the spiders on which it is supported.

This efiect is produced by an air-shield which closely embraces the pinion end of the armature, constituting an annular chamber communicating with the ducts and air-passages in the core and spiders. Pipes or fines run 2 5 from this chamber to the outside of the motor frame or casing and admit cool air to the chamber only. At the commutator end of the motor the frame is provided with one or more openings to permit the heated air to cs cape. The current of air through the shield and passages is produced by the centrifugal movement of the air induced in said passages by the rapidly-rotating armature.

The drawing is a longitudinal half-sectional elevation of the railway-motorembodyingmy improvements.

The head A at the pinion end of the motor extends inwardly to form a bearing for the armature-shaft and has an interior cylin- 0 drical shoulder a, on which is fitted a ring or cylinder B, extending inwardly and closely embracing the head of the spider C. At one or more points in the peripheral surface of the cylinder or ring there is an opening I),

5 communicating with one of the pipes or flues D, which run out radially through the frame or casing E of the motor, between the fieldmagnets and the end of said frame.

It will be seen that the head A, the ring B,

and the spider O constitute an annular chamber concentric with the shaft and communiarmature.

between the coils L from the ducts I, of which there are several running lengthwise through the core. Passages H are formed in the spiders O O, extending outwardly from the ducts I. At the commutator end of the motor one or more passages e are made in the frame toipermit the heated air to escape.

The operation of my device is as follows: When the armature isin rapid rotation,it acts like a centrifugal blower to expel the air from the passages H H. Inasmuch as no air can enter the passages except through the pipes D, the annular chamber above referred to, and the ducts I, it follows that a current of cool air will flow in through the said pipes and chamber and out through the ducts I and passages H-H, entering the space M, surrounding, the armature, inside the frame E, and thence escaping through the hole e and rapidly carrying off the heat generated in the A practical test of the invention shows that the rise in temperature of the coils, core, spools, and frame is less by from 10.5 to "18 centigrade than it Would be without this device, the greatest reduction being in the coils and core,where the heating 9o effect is most injurious. The ring B fits so closely to the end of the spider that practically no air can enter it from the space M, so that the air can pass throughthe core but once, and thus a continuous supply of coolair 5 is insured.

What I claim as new, and desire to secure by Letters Patent of the United States, is-- 1. The combination with an inclosed electric motor having a rotating element provided Ic o with air-passages, whereby it operates as a centrifugal blower, said rotating element being journaled in the end of the motor-inclosure, of an inlet-opening in the side of the inclosure, and communications between said inlet and said air-passages alone.

2. In an electric machine, the combination with a rotating element provided with cooling-passages, whereby said element operates as a centrifugal blower, of closed fines for connecting said passages with the outside of the machine.

3. In an electric machine, the combination with a rotating element provided with cooling-passages, whereby it operates as a centrifugal blower, of an annular chamber communicating with said passages, and closed fiues connecting said chamber with the outside of the machine.

4. In an electric machine, the combination with a rotating element provided with cooling-passages, whereby it operates as a centrifugal blower, of a closed annular chamber communicating only with said passages and with the outside of the machine.

5. The combination, with a motor-frame, of an armature having longitudinal ducts and radial air-passages through its core, a ring tightly inclosing the end of the armature, and forming with an extension of the armature a chamber communicating with said longitudinal ducts, and pipes connecting the ring with the outside air.

6. The combination, with a motor-frame having an opening at one end and at the other end a head provided with an interior cylindrical shoulder, of a ring fittingsaid shoulder, and pipes running from said ring to the outside of the frame.

7. The combination, with an armature having the spiders O, 0 containing air-passages H, the core F having air-ducts I and passages H, the ring R closely inclosing the spider O, and the pipes D extending from said ring.

8. In an electric machine, the combination with a rotating element formed with coolingpassages, whereby it operates as a centrifugal blower, of a ring or cylinder forming with the rotating element an annular chamber communicating with said passages, and closed flues connecting said chamber with the outside of the machine.

9. The combination with an electric machine provided with a casing and having cooling-passages in its rotating element, whereby the latter operates as a centrifugal blower, of a head closing the end of the casing and extending inside the latter to serve as a hearing for the rotating element, said cooling-passages having communication between the end of the machine and the end of the casing with the outside of the latter.

10. The combination with an electric machine provided with a casing and having cooling-passages in its rotating element, whereby the latter operates as a centrifugal blower, of a head closing the end of the casing and extending inside the latter to serve as a bearing for the rotating element, and passages connecting the outside of the casing with the interior of the machine only through the passages in the rotating element.

11. The combination with an inclosed electric machine havinga rotating element formed with cooling-passages, whereby said element operates as a centrifugal blower, of a head forming a part of the inclosure and extending inside the inclosure to form abearing for the rotating element, and closed fiues connecting the said cooling-passages with the outside of the inclosure.

12. The combination with an inclosed electric machine having its rotating element provided with suitable cooling-openings, whereby said element operates as a centrifugal blower, of a head completing the inclosure and extending inside the latter to serve as a bearing for the rotating element, an annular chamber communicating with said openings, said chamber having communication also between the machine and the head with the outside of the inclosure.

13. The combination with an inclosed electric machine having a rotating element formed with cooling-passages, whereby said element operates as a centrifugal blower, of a head forming a part of the inclosure and extending inside the latter to form a bearing for the rotating element, and a ring forming with the head and rotating element an annular chamber which communicates with said coolingpassages and with the outside of the inclosure.

l t. The combination with an inclosed electric machine having a rotating elementformed with cooling-passages, whereby the said element operates as a centrifugal-blower, of a head completing the inclosure at one end of said element and extending inside the inclosure to form a bearing for said element, the inclosure being provided with a suitable inlet through which air is drawn between the end of the machine and the end of the inclosure, and thence into the cooling-passages in the rotating element.

15. The combination with an inclosed electric machine havingarotating elementformed with cooling-passages, whereby said element operates as a centrifugal blower, of a head inclosing the machine at the end and extending inside the inclosure to form a bearing for the rotating element, and openings in the sides of the machine-inclosure through which air is drawn into the space between the machine and the head, and thence into said cooling-passages, by the rotation of said element.

16. The combination with an inclosed elec tric machine having a rotating element provided with cooling-passages,whereby said element operates as a centrifugal blower, of a head inclosing the machine at the end and extending inside the inclosure to form a hearing for said element, and passages connecting the outside of the machine with the inside only through said cooling-passages in the ro tating element.

17. The combination with an inclosed electric machine having a rotating element provided with cooling-passages,whereby said e1e ment operates as a centrifugal blower, of a head inclosing the machine at the end of said element and extending inside the inclosure to form a bearing for the latter, and an annular passage which connects the outside of the machine with said cooling-passages, said annular passage being formed by portions of the rotating element and the head.

18. In an electric machine, the combination with a rotary element formed with ventilating-openings, of a shield closely embracing said element to prevent rentrance of heated air into said ventilating-openings, and to per-

Images