US1401548A - Electric motor - Google Patents

Description

T. J. MURPHY.

ELECTRIC MOTOR. 7 1,401,548. APPLICATION FILED SEPT 17, I9I7- 27 I!!! Hi! f nu 16 5!. I i l W 7 2-9- N h"??? i l g INVEN TOR.

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T. J. MURPHY. ELECTRIC MOTOR.

I APPLICATIONFILEDSEPT.l7,I917- 1,4o1,54s. V

Patented Dec. 27, 1921.

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ZZZ/A TTORNEYS UNITED STATES.

PATENT OFFICE.

THOMAS J'. MORPHY, OF ROCHESTER, NEW YORK, ASSIGNOR OF ONE-HALF T0 JAMES P. B. DUFFY, OF ROCHESTER, NEW YORK.

ELECTRIC MOTOR.

Specification of Letters Patent. Patented Dec. 27, 1921 Application filed September 17, 1917. Serial No. 191,738.

To all whom it may concern:

Be it known that I, THOMAS J. MURPHY, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Electric -Motors; and I do hereby declare the followuniversal type, such as are employed in the operation of fans, sewing machines, sound reproducing machines, and other apparatus requiring only a comparatively small amount of power. More specifically, the invention is intended to eliminate the difliculty usually involved in obtaining proper alinement of the armature and field elements of a motor,

and in reducing the number of machine oper-i I ations required in assembling the parts A. furthergobjiectof the invention, is to provide a simplified casting, constituting a support for both thefa rmature and field and auxiliary parts, and permitting of very readily assembling these parts in their correct operative relation. An additional purpose of the invention is to afford a simple and advantageous form of mounting for holding the motor effectively in proper driving relation with the member to which power is transmitted. To these and other ends the invention consists in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

I In the drawings:

Figure 1 is a vertical sectional view with parts in elevation showing the application of the motor to a turntable of a sound reproducing apparatus;

Fig. 2 is asectional view of the motor;

Fig. 3 is a similar sectional view illustrating a modified arrangement;

Fig. 4 is a side elevation;

Fig. 5 is a side elevation looking at one 7 side of Fig. ,4;

the; motor;

Fig. 7 is a sectional view on the line 7f-7 of Fig. 5, and Fig. 8 is a sectional view taken on line 8**8 of Fig. 1.

Similar reference numerals in the several figuresindicate the same parts.

The invention is susceptible of various appllcations in electric motor apparatus, and while peculiarly fitted for small work, it may likewise be adapted with advantage to other and larger electric machines and the particular arrangement which I am disclosing here 1s intended by way of example of a practicable manner of carrying out the improvements.

eferring to Figs. 2, and 4 to 7, the structure comprises a supporting frame having oppositely disposed bearings 1 and 2 which receive t e ends of an armatureshaft 3. The supporting frame or loop member also embodies arms 4 at each end and longitudinal portions 5 connecting the bearings l and 2 before mentioned. 6 designates the armature mounted upon the armature shaft 3, preferably through an intermediate sleeve 7. 6 indicates the commutator carried on sleeve 7 and 7 a the brushes received and supported 1n suitable openings in the longitudinally extending members 5 carrying the bearings. In the assemblage of the parts, the armature containing the sleeve 7 can be positioned within the frame, after which the shaft is inserted from one end of the frame and forced through the sleeve 7 until it is engaged properly in the bearings l and 2. In Fig. 3 I have shown a slightly modified form that permits inserting the armature and shaft already assembled through one end of the frame. To this end, the frame may be provided with a removable end plate 8 which carries a bearing 9 for the armature shaft andis secured within an opening in longitudinal porti'onshfir The'shoulder 11- constitutes a stop'for one end of the field a in the form of a ring 12. The ring 12 fits element, while the opposite end is engaged by a removable retaining device, preferably over the frame against the uppermost lamination of the field element and -is held in place by the suitable securing means. To this end, the ring 12 has formed thereon extensions 13 which project toward the annular shoulder 11 and receive attaching screws or other similar devices 14 which cooperate with the annular shouldertof the frame and engage the extensions on there movable ring, serving to hold the latter in fixed and rigid relation, and thus retaining the field element in place. This arrangement is of marked advantage in that it permits the supporting frame to be cast as a single unit, with the bearings of the armature shaft and the position of the field element predetermined. These parts can be readily brought into their operative relations upon the supporting frame, which insures accuracy of position and eliminates the difficulty and time required ordinarily in machining various parts to obtain a correct relative position between thearmature and the field.

The armature shaft 3 is provided with a driving member in the form of a pulley 15, which in the present instance engages the edge of a turntable-16 and drives the latter frictionally. It is desirable that the pulley 15 be held yieldably against the driven member or turntable 16, but with sufficient pressure to obtain the desired friction between the parts. This I accomplish by pivotally mounting the motor between the stationary arms 17, which are provided with trunnions 18 that engage openings in the aforesaid extensions 13. Positioned between the arms 17 is a stationary abutment 19, while 20 is a rod extending through the abutment l9 and provided with a yoke 21 ivoted to the end 22 of the motorframe; he rod 20 is slidable in the abutment 19, and on opposite sides thereof are springs 23 and 24, the latter being held in place by a nut 25, which is adjustable to vary the tension under which the motor is held in driving contact with the driven member. This arrangement holds the motor firmly, yet yieldably, and effectually revents undue vibration or chatter. 26 are elt washers located against the abutment 19, and 27 are metal washers which engage the springs, the felt washers serving to deaden the sound caused'by relative movement of the parts.

The motor trunnions are also preferably mounted on felt bushings 28, the latter being held in lace against the shoulders 21, by means of fiber washers 29. The washers 29 are retained b heads 30 on the trunnions. There is a slig t clearance between the trunnions 18 and the shoulders 31, sufiicient to prevent their coming into engagement, so

that the motor rests entirely on the felt supports 28, and is yieldable thereon.

Among the advantages of my construction may be mentioned. the fact that when my machine is used as an alternating current motor, the longitudinal portions 5 together with the arms 4 act as a short circuited winding inductively cooperating with the field and armature to reduce the self induction of the 'fieldwhile at the same time acting as a combined support and clamping means for the stator laminations. By making the longitudinal, portionsperform these two functions,

it will be seen that a beneficial saving in weight and external dimensions of the machine is possible.

I claim as my invention:

1. In a dynamo electric machine, the combination with a rotor of a stator comprising bearings therein for the rotor, longitudinal portions connecting said bearings and in inductive relation to the field, external shoulders on .said longitudinal portions, stator laminations supported externally on said longitudinal portions and a clamping member on said longitudinal portions cooperating with said shoulders to secure the laminations in place, the stator laminations being provided with pole ieces between and spaced from said longitu inal portions.

2. In-a dynamo electric machine, the combination with arotor, of a stator comprising oppositely disposed bearings therein forthe rotor, longitudinal portions connecting said same, windings on said lamination'sarranged' to have said longitudinal portions in inductive relation to the stator field.

3. In a dynamo electric machine, the combination with an armature, of a field frame comprising oppositely disposed integral bearlng housings therein for the armature, longitudinally extending portions integral with and connecting said bearings, laminations supported by said longitudinal portions and surrounding the same, windings on said field frame and armature to produce cooperatin magnetic fluxes, said longitudinally exten ing portions being in inductive relation with one of said fluxes.

4. In -an alternating current motor the combination with a rotor, of a stator comprising oppositely disposed bearings therein for the rotor, longitudinal portions integral with and connecting said bearings, laminations su ported by said longitudinal portions and surrounding the same, windings on said laminations arranged to have said longitudinal portions in inductive relation to the stator field.

5. An electric apparatus comprising a frame having oppositely arranged bearings and longitudinal portions connecting the same, an annular member upon said longitudinal frame portions, a field element supported by said annular member, a retaining member for said field element having extensions projecting in the direction of said annular member, and means connecting said extensions with said annular member to hold the field element in contact therewith.

6. In an electric motor, the combination with stator laminations and a rotor, 01 a moleeularly integral loop member having in- 10 member being inductively related to one of 15 said fluxes as a short circuited Winding.

THOMAS J. MURPHY.

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