US1651061A - Motor construction - Google Patents

Description

Patented Nov. 29, 1927.

PATENT OFFICE.

T. JANET'IE, OF CHICAGO, ILLINOIS.

MOTOR CONSTRUCTION,

.Application filed, December l5, 1924.

lhile certain features of this invention may be utilized for general purposes, it is more particularly directed to motors of thc type operated by alternating current. Herctofore, such motors have usually been constructed with cast frames in which the stators are mounted. These frames must 'be made comparativelyA heavy and require a considerable amount of machining in order to properly finish the same and to provide suitable means for attaching the stators. Instead of such cast frame, the present invention provides a frame made of sheet metal or the like and means for readily mounting the stators therein.

Among the objects of this invention are to provide an improved alternating current motor construction; to provide an electric apparatus of the motor or generator type with a frame formed of sheet metal; to provide means for centering and mounting` a stator in a tubular frame or support; and in general, to provide such features of construction as will appear more fully hereinafter.

In the accompanying drawings illustrating a preferred form of this invention, Figure l is a side view with parts broken away to show the interior construction; and

Figure 2 is an end view also with parts broken away.

The stator 3 or non-rotatable portion of the motor may be of any ordinary or preferred form of construction and is shown as being built up `of laminations in the usual manner. My improved frame 4e which supports the stator is made of drawn or sheet metal or preferably sheet steel and of tubir lar or cylindrical shape as shown. In order to cheapen the construction, as well as for other purposes which will presently appear` I prefer to make a frame of a fiat strip of steel and punch or roll the same into the form desired.

The ends 5 of theblank from which the frame is formed are provided with undercut recesses G for receiving a key 'r' which is substantially V-shaped at the ends in order to fit in the adjacent recesses to lock the parts together, The key 7 is secured to a splice or inner strip 8 by means `of a rivet 9 or in any other suitable manner. The splice or reenforcing strip 8 engagesclosely with the adjacent ends of the band or ring 4 and is secured thereto by means of rivets l0.

The stator 3 has longitudinal grooves .1l

Serial No. 755,959.

in its outer surface for receiving studs or spacing members l2 which are used for hold ing it in position in the frame 4L. lVhile I have shown four of these studs, which is sufficient for a small motor, any desired number may be used. These studs or spacing members are conveniently made from cold rolled steel rods and are tapped at the ends for receiving screws for holding the end frames (not shown). The splice plate, or reenforcing strip 8 is made of proper length so that two of the studs or pins 12 will engage with the ends thereof, as clearly shown in Figure 2. It is desirable to have the stators always positioned in the same relative circumferential location with respect to the split in the frame t so that the splices 8 serve as a convenient means for properly locating the stators. Furthermore, the ends of these splices provide abutments to prevent any possibility of rotation or circumferential movement of the stators in the frames. The ends of the pins or studs l2 are preferably slightly tapered, as shown at 13, for convenience in driving them into position. The parts may be arranged so that the pins or studs will have a comparatively tight lit and the frame 4t, which is comparatively thin, will yield sufficiently to permit the pins to be driven into position and will hold them firmly in place.

It will be seen that my improved motor construction provides an exceedingly light frame which may be cheaply made and which requires no finishing. Furthermore, as the pins or studs l2 occupy but little room, ample Ventilating space is provided between the stator and the frame and as the material of the frame is a good conductor of heat, it will assist in keeping the motor properly cooled.

Various changes may be made in the details of construction and arrangement of parts in order to adapt the motor for different conditions or for dierent sizes and therefore I do not wish to be limited to the exact construction or arrangement herein set forth, except as specified in the following claims:

l. A frame member of the character set forth, comprising a ring formed of a single strip of sheet metal having undercut recesses in the ends thereof, a key fitting in said recesses and a splice engaging with the key and the adjacent ends of the ring.

2. In a motor construction, the combination With a stator having longitudinal grooves in its outer surface, of a frame comprising` a ringl formed of sheet steel with a splice connecting the ends thereof and studs interposed between the stator and the ring, said studs ttingv in said grooves, two of said studs engaging with the ends of the splice.

3. A motor Construction eomprising' a resilient ring, a stator mounted in said ring', spacing;l members inserted bet-Ween the stator and the ringr and adapted to eentralize the stator within the ring. said ring having an abutment 'for engagement with one or more of the spacing members for preventing' rotary movement thereof, and the stator having recesses for receiving said spacing members.

4. In a motor construction, the combination of a resilient annular frame member having an abutment on its inner surface, a stator, and pins inserted between the stator and frame member for eentralizingr the stator, one or more oit said pins engaging with said abutment to hold the stator from turning` in the iframe member.

The combination of a resilient annular frame member, a splice connecting the ends oil'v said member, a stator having lonfgitudi nal grooves therein and pins engaging with the grooves in the stator and the frame member, two ot said pins engaging' With the ends ei said splice for preventing rotation of the stator in the trame, said pins having holes in the ends thereof for securing end frame members therettn substantially as described.

JOHN T. JANETTE.

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