US2152458A - Motor - Google Patents

Description

March 28, 1939. s. R.4 BERGMAN MOTOR 2 Sheets-Sheet l Filed May 8, 1937 l IYwVem/Ytor: Sven F2. Bergman; by 55'/ y |"1i ACfbofrwev March 28, 1939. s. R. BERGMAN MOTOR Filed May 8, 1957 2 Sheets-Sheet 2 Figi.

4 E-f Inventor. 5:/.65x/0-4 Sven Bergm an by )Va/147 His Attoffw ey.

FREQUENCY IN RARM.

600 80D i000 i200 H00 i500 i800 2000 Patented Mar. 28, 1939 UNITED STATES PATENT OFFICE MOTOR New York Application May 8, 1937, Serial No. 141,539

33 Claims.

My invention relates to high speed vertical shaft spinning devices, such as vertical shaft motors.

Vertical shaft high speed spinning spindles are widely used in the textile industry for driving spinning devices, rayon buckets, or the like, and since it is necessary for these spindles ordinarily to operate at speeds above 4,000 R. P. M. and above one or more critical speeds of the device, some provision usually is made for damping oscillations of the device as it passes through its critical speeds to prevent excessive vibrations and the transmission of these vibrations to the spinning frame. It also is desirable that the bearing pressures due to these vibrations be reduced to a minimum.

An object of my invention is to provide an improved spinning device of this type, such that the shaft and the device driven thereby can pass through the critical speeds without excessive vibrations or excessive bearing pressures when coming up to normal operating speed.

Further objects and advantages of my invention will become apparent and my invention will be better understood from the following description referring to the accompanying drawings, and the features of novelty which characterize my invention will be pointed out with particularity in the claims annexed to and forming part of this specification.

For a better understanding of my invention, reference is made to the accompanying drawings, wherein Fig. 1 is a sectional elevation of a spinning motor embodying my invention; Fig. 2 is a perspective view partially broken away of a flexible supporting element made according to my invention; Fig. 3 is a partial sectional elevation of another embodiment of my invention in a spinning motor; and Fig. 4 represents critical resonant speed characteristics of a flexible resilient supporting element as shown in Fig. 2.

Referring to the drawings, I have shown in Fig. l a spinning motor having a stationary member I0 including a core structure I I provided with a suitable stator Winding I2. The motor is enern gized by current from a. source of electrical power supply connected to the stator terminal I3 by a conductor I4. A rotatable member I5 having a squirrel-cage winding I6 is mounted on a vertically extending shaft I'l arranged to drive a spinning device, such as a rayon spinning bucket. In order to support the rotatable member of the lmotor, aball bearing I8 is arranged intermediate the ends of the shaft Il, and a sleeve bearing I9 is arranged about the lower end thereof and mounted within the lower end of an axially extending bearing housing 20. The ball bearing I8 is provided with an inner race 2l fitted on the shaft Il below the rotatable member I5 of the motor, and retained in position by a collar 22 press fitted on a shoulder 23 of the shaft I1. An outer bearing race 24 is secured on a flange 25 on the upper end of the bearing housing 20 by a cover plate 26 arranged about the shaft I'I and secured by screws 21 to the bearing housing 20.

In order to dampen oscillations of the spinning device when passing through its critical speeds, the bearing housing is supported by a flexible resilient mounting member comprising a laminated cotton fabric disk 28 or other spinnable material, Which resiliently restrains shaft oscillations and possesses high damping characteristics by internal friction. In making this disk, the fabric is compressed in a mold under pressure of from one ton to nine and one-half tons per square inch, and secured together between pairs of rigid steel rings. As shown in Fig. 2, this flexible mounting is provided with a central opening 29, and on each side thereof rigid retaining rings 30 are secured together by threaded studs or rivets 3l which engage complementary threaded openings in the retaining rings 3|] in order to clamp together the laminated fabric 28. Another pair of retaining rings 32 is arranged about the outer periphery of the fabric disk, and threaded studs or rivets 33 threadedly engage 'and secure together these rings and the outer edge of the disk. This provides a resilient flexible central bulged out portion 34 which is under pressure, and a high degree of internal friction in the compressed cotton produces the desired damping without permanent distortion. I have found that with increasing pressure on the fabric, the flexible resilient disk assumes the characteristics of a solid material such as metal, and that at the lower pressures it will act like a plastic or semi-p1astic material. If it acts like a metal, it will not have the desired damping properties, and if the pressure applied in assembling the disk is substantially below one ton, it becomes too loose and gradually becomes permanently distorted. For the construction illustrated, I have found that a pressure of substantially one ton per square inch when assembling the disk produces the best results with cotton fabric, such as cotton duck, and about one-half of this pressure remains between the retaining rings 30 .and 32 after the assembling pressure is removed. I also have found that such a flexible resilient disk shows no substantial fatigue under continued vibrations, and has suiiin cient internal friction to reduce substantially the resonant amplitudes of the spinning device, and, therefore, produces a very effective damping medium. With this type of resilient flexible suppornt, it is desirable that the resonant or critical Vspeed of the support should be below operating speeds of the device, and that the amplitude of vibration or oscillation should not be too great, as otherwise, the rotatable member of the dynamo-electric machine might strike against the stationary member of the machine, and excessive bearing pressure .also might result. As explained above, the internal friction damping of the cotton disk limits the amplitude of vibrations, and the clamping pressure on the laminated cotton fabric produces the desired resiliency, in order to allow a certain amount of displacement without permanent distortion. As is known from the principles of mechanical vibrations, in pseudoharmonic systems the amplitude of vibrations is a direct function of the unbalancing forces for predetermined accelerating or decelerating speeds. In one type of resilient system the stiffness is a direct function of the deflection, and

the resonant or critical speed or natural frequency of such a system also is directly proportional to the square root of its instantaneous stiffness, so that the natural frequency of such a system increases with increase in deflection or unbalancing force. In a system having a constant stiffness, the resonant or critical or natural frequency of the system is substantially constant, and the deflection at critical speeds is a direct function of the unbalancing force. It is desirable, however, that the resonant frequency should decrease with increase in unbalance, so that an increase of unbalancing force will produce a lower critical speed. This requires that the resilient system have a stiffness which decreases with an increase in deflection. Systems having this characteristic generally produce increasing deflections with increasing speeds to a certain value, and then the deflections suddenly increase in amplitude without further increase in speed. Further increase in speed beyond this point results in a decreased deflection. When decelerating, however, such systems produce increasing deflections which continue to increase at speeds below the suddendeflection-increase speed when the speed of the device was increasing; until at another lower speed, the deflection suddenly decreases without further deceleration to the value corresponding to the deflection at that speed when accelerating` Thus, in pseudo-harmonic systems of this type having an elastic constant which decreases with amplitude of deflection, a smaller maximum amplitude results when accelerating through critical speed than when decelerating, and the speed at which maximum amplitude of deflection is attained is higher when accelerating than when decelerating. In all of these systems, the critical speeds are an inverse function of the square root of the moment of inertia of the system, and for a given moment of inertia, the deflection increases with an increase in unbalance. The latter type of system is the most desirable of the three, as it is desirable to pass through the speed at which maximum amplitude of deflection is obtained before reaching operating speeds when accelerating, and that the deflection at this speed should be as small as possible, whereas when decelerating, the critical speed is not as important as the system is then operating at a lower speed when critical speed is reached, and comes to rest shortly thereafter. Furthermore, when decelerating the rotational energy of the system is used to increase the deflection, so that the speed falls still more rapidly as the rotational energy is dissipated. The support which I have described possesses the pseudo-harmonic characteristics illustrated by the curves in Fig. 4, and varies from the three systems described, in that tests have shown that there is substantially no dillerence in maximum amplitude of deflection or resonant frequency between accelerating and decelerating conditions for any given unbalance and moment of inertia. As shown by the family of curves E, for a constant moment of inertia of lL08-poundinch-secondsz, the amplitude of deflection has a shape below resonance which indicates small damping and very high resonant amplitude, that is, there is a very small substantially constant or very gradually increasing deflection with increase in speed at low speeds, and a very sharp rise beyond a given speed. However, when maximum deflection is nearly reached, the curve breaks sharply, giving a gradual reduction in amplitude of deflection beyond resonance, which indicates high internal damping. In these curves, E is the unbalance of the system supported on my irnproved resilient disk in pound-inch-seconds2, and I is the moment of inertia of the system in pound-inch-secondsz. Thus, my resilient flexible support has the very desirable characteristic of the same denite critical speeds for both accelerating and decelerating, and this critical speed decreases with increase in unbalance. From further tests, I have found that the critical or resonant frequency varies inversely as a function of the moment of inertia of the system, as shown by the curves I in Fig. 4, which represent the maximum critical frequency deilections for constant moments of inertia for different unbalances on the systems. From these curves, it is readily seen that the resonant or critical speed is an inverse functilon of both the unbalance and the moment of inertia of the system.

In manufacturing these disks, I also have found it desirable to saturate the cotton duck with oil before compressing it. When assembled` and threadedly engage the bearing cover plate 26, f

so as to rigidly secure them together. In order to minimize bearing pressures due to oscillations of the rotatable member and the vibrations transmitted to the resilient disk support, this resilient supporting disk is located just below the ball bearing, so that the oscillatory movements of this bearing will be substantially the same as that of the resilient disk. Furthermore, the mass of the rotatable member, the distribution of the mass of the rotatable parts, the arrangement of the bearings, and positioning and stiffness of the resilient disk are such that the center of oscillation oi the rotatable member at its critical speeds is adjacent the point of intersection of a plane passed through the center of the laminated resilient disk at right angles to the geometrical center line of the rotatable member and the geometrical center line of the rotatable member. With this arrangement, the force on the bearing, the displacement of the bearing, and the deformation of the flexible 'I6 resilient support dueto oscillation at critical speeds are all minimized. The above relation cannot be maintained under all operating conditions, as the load and. the unbalance of the load will rarely be exactly the same.

In such a supporting arrangement, it is desirable to minimize the transmission of Vibrations to the supporting spinning frame, as well as to allow the spinning spindle to pass through its critical speeds without excessive vibrations. In order to ob-tain this result, I have found it desirable to support the resilient disk 28 on an axially extending housing 31, to which the resilient disk 28 is secured by screws 38 extending through openings 39 in the outer rings 32 of the laminated disk 28 and threadedly engaging openings in bosses 48a adjacent a shoulder 40 formed on the housing 31. The stationary member of the motor also is mounted in this housing 31, which extends around the stationary member II and below the lower end of the motor shaft I1. This housing is secured at its lower end by screws 4I to the outer edge of a flexible resilient diaphragm 42 made of a composition of fabric and a heat hardened phenolic condensation product, or a substance havingv similar flexible and resilient characteristics. This diaphragm mounting is made to have such resiliency and the mass and distribution of mass of the stationary member of the driving motor and the housing 31 is such that -the center of percussion of the stationary member is approximately at the intersection of a plane through the center of the resilient disk 28 at right angles to the geometrical center line of the rotatable member and the geometrical center line of the rotatable member. In this manner, the oscillation of the base of the housing is reduced to a minimum, and the resiliency of the diaphragm 42 is made such that it tends to damp out the small vibrations which may be transmitted to its central portion. The diaphragm 42 is secured' adjacent its center by screws 43 to an upwardly extending boss 44 formed on the inside of the bottom of a casing 45 which extends upwardly about the housing 31, so that the diaphragm is supported above and out of contact with the bottom of this casing. Tapped holes 46 are provided in bosses 41 on the base of the casing 45 for securing it to a spinning frame or the like, and an upper end shield 48 is secured by screws 49 zto the upper end of the casing 45. The upper end shield is formed with an axially extending opening 50 therein through which the upper end of the shaft I1 extends. An adaptor 5I is mounted on the tapered upper end 52 of the shaft I1, and is adapted to support a removable spinning bucket or the like. In order to exclude foreign substances from the casing, a deilector 53 is mo-unted on the shaft I1 and extends over the opening 58 and the adjacent portion of the upper end shield 48.

It is desirable that the bearings supporting `the spinning device be properly lubricated, and

that some arrangement be made for an adequate supply of lubricant which can be readily changed when desired. For this purpose, the stationary casing 45 and the housing 31 are used as lubricant reservoirs, and lubricating oil 54 can be supplied to the casing 45 through a filling cup 55 secured to the upper end of the casing. The bottom of the. casing 45 is provided 'with an opening 56 which is normally closed by a drain plug 51 threaded into this opening, and an opening 58 connects the opening 56 with the inside of the casing 45. An opening 58 extends through the resilient diaphragm 42 and provides a communication between the inside of the casing 45 into housing 31 through which lubricating oil can flow between them. In order to lubricate the bearings, the lower end of the shaft I1 is provided with an axially extending opening 68 which communicates with a radially extending opening 6 I. A circumferential groove 62 is formed on the inside of the sleeve bearing I9 in communication with the radial opening 6I and an axially extending groove 63 extends from the circumferential groove 62 to the upper end of the sleeve bearing I9. The openings in the lower portion of the shaft I1 provide a centrifugal pump which forces oil under pressure around the sleeve bearing I9, so as to lubricate the same, and up through the axial groove 63 through the space between the tapered shaft I1 and the bearing housing 28, which are arranged in closely spaced relation. In this manner, oil is pumped by the pump and tapered shaft to the ball bearing I8, and any excess oil will flow out through an opening 64 formed in the shoulder 35 of the bearing housing. If lubricant passes through the ball bearings I8, the cover plate 26 will prevent the passage of the lubricant along the shaft to the rotatable member of the motor, and it will drain through an opening 65 into the passage 64, and will overflow into the groove between the inner and outer rings of the flexible disk 28. This arrangement will prevent the supply of excess lubricant to the ball bearings I8, and will also keep the resilient central portion 34 of the resilient disk 28 covered with oil, which will protect it from the deteriorating eect of acids used in the spinning process. When the groove between the rings of the resilient disk is filled with lubricant, it will overflow and cover the outer ring 32. In order to remove this lubricant, openings 66 are formed through the rings 32 and `the resilient disk 28 so that the lubricant can drain back into the lubricant reservoir formed by the housing 31. In order to insure that the lubricant will be properly drained from above -the resilient disk 28, openings 61 also are formed through the housing 31 'above the shoulder 4I) which supports the resilient disk 28. If the lubricant which overflows the upper outer ring 32 is not sufficiently drained through the opening 66, it will flow thereonfaround the outer periph ery of Ithe resilient disk 28 and out through the opening 61 into the lubricant reservoir which is formed within the casing 45. A filter 68 is secured to the lower end of the bearing casing 28, so that the oil which is pumped by the centrifugal pump formed in the lower end of the shaft I1 passes through this lter before being supplied to the bearings.

In certain applications, a more simple motor construction is desirable. Fig. 3 illustrates a spinning motor having a stationary member 69 including a core structure provided with a suitable exciting winding 1I. A rotatable member 12 having a squirrel-cage winding 13 is mounted on a vertically extending shaft 14 and is arranged to drive a spinning bucket supported on an adapter 16. The rotatable member is supported by a bearing arrangement similar to that shown in Fig. 1, wherein the bearings are mounted in a bearing housing supported by a resilient fabric disk. In this figure, a bearing housing is secured to a resilient disk 28 by screws 21 extending through the resilient disk 28, the bearing housing 20, and threaded in a defiector 26. This resilient disk construction is similar to that shown in Fig. 2, and is rigidly secured by screws l1 to a shoulder 18 formed on an axially extending housing 19. Openings 66 extending through the disk assembly are arranged to drain excess lubricant from above the disk back into the housing 19. This housing also supports the stationary member 69 and is utilized as a reservoir for oil 80 which is used to lubricate the bearings which support the rotatable member of the motor. Lubricant may be supplied to this reservoir through a filling cup 8| and may be drained by removal of a drain plug 82 threaded in an opening 83 formed in the bottom of the housing 19. An axially extending threaded hub 84 is formed on the lower end of the housing 19 so that the spinning device may be secured to a spinning frame or the like.

Modifications of the embodiments of my invention, which I have illustrated and described, will occur to those skilled in the art. I desire it to be understood, therefore, that my invention is not to be limited to the particular arrangements disclosed, and I intend, in the appended claims, to cover all modifications which do not depart from the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft, a bearing mounted on said bearing housing adjacent said rotatable member and arranged to support said rotatable member, and resilient means arranged adjacent said bearing for resiiiently supporting said rotatable member through said bearing housing on said stationary member.

2. A spinning device comprising an electric motor including a stationary member and a rotatable member' having a vertically extending shaft, a bearing arranged about said shaft intermediate the ends thereof adjacent the lower end of said rotatable member, and means including a resilient member arranged adjacent said bearing for resiliently supporting said rotatable member on said stationary member.

3. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, a bearing arranged about said shaft inter mediate the ends thereof adjacent the lower end of said rotatable member, and means including a resilient member of compressed spinnable material arranged adjacent said bearing for supporting said rotatable member on said stationary member.

4. A spinning device comprising an electric motor including a stationary member and a rotatable member' having a vertically extending shaft, a bearing arranged about said shaft intermediate the ends thereof adjacent the lower end of said rotatable member, and means including a resilient member of compressed spinnable material saturated with oil for supporting said rotatablc member on said stationary member.

5. In combination, a high speed spindle subject to critical vibrations, and resilient means for supporting said spindle, said resilient means hav ing pseudo-harmonic characteristics and such resiliency and damping that the critical frequency thereof is substantially the same for both accelerating and decelerating conditions for any given unbalance and moment of inertia of said spindle within its operating range,

6. In combination, a high speed spindle subject to critical vibrations, and means including a resilient member of compressed spinnable material for supporting said spindle, said resilient member having such resiliency and such internal damping that the critical frequency thereof is an inverse function of the unbalance producing the vibrations of the said spindle.

7. In combination, a high speed spindle subject to critical vibrations, and means including a resilient member for supporting said spindle, said resilient member having such resiliency and such internal damping that the critical frequency thereof is an inverse function of the unbalance producing the vibrations of said spindle.

8. In combination, a high speed spindle subject to critical vibrations, and means including a resilient member for supporting said spindle, said resilient member having pseudo-harmonic characteristics and such resiliency and damping that the maximum deflection at critical frequencies thereof is substantially the same for both accelerating and decelerating conditions for any given unbalance and moment of inertia of said spindle within its operating range.

9. A dynamo-electric machine having a verti cally extending shaft adapted to operate at speeds above 4,000 R. P. M. and subject to critical vibrations, and resilient means for supporting said shaft, said resilient means having such resiliency and such damping that the critical frequency thereof is an inverse function of the unbalance on the shaft producing the vibration thereof.

10. A dynamo-electric machine having a shaft adapted to operate at speeds above 4,000 R. P. M. and subject to critical vibrations, and resilient means for supporting said shaft, said resilient means having pseudo-harmonic characteristics and such resiliency and high internal damping that the critical frequency thereof and the maximum deflection at the critical frequency thereof are substantially the same for both accelerating and decelerating conditions for any given unbalance and moment of inertia of said shaft Within its operating range.

11. A dynamo-electric machine having a shaft adapted to operate at speeds above 4,000 R. P. M., and resilient means for supporting said shaft, said resilient means having pseudo-harmonic characteristics and such resiliency and damping that the critical frequency thereof is substantially the same for both accelerating and decelerating conditions for any given unbalance and moment of inertia of said shaft Within its operating range.

12. A dynamo-electric machine having a shaft adapted to operate at speeds above 4,000 R. P. M. and subject to critical vibrations, and resilient means including a member of compressed spinnable material for supporting said shaft, said member having such resiliency and such internal damping that the critical frequency thereof is an inverse function of the imbalance producing the vibrations of the said spindle.

13. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, a bearing housing, a bearing mounted on said bearing housing adjacent said rotatable member and arranged to support said rotatable member, and resilient means arranged adjacent said bearing for supporting said bearing housing on said stationary member, said resilient means having such resiliency and such damping that the resonant or critical frequency thereof is an inverse function of the unbalance of the device.

14. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing, a bearing mounted on said bearing housing adjacent said rotatable member and arranged to support said rotatable member, and resilient means arranged adjacent said bearing for supporting said bearing ho-using on said stationary member, said resilient means having pseudo-harmonic characteristics and such resiliency and damping that the resonant critical frequency thereof is substantially the same for both accelerating and decelerating conditions for any given unbalance and moment of inertia within its operating range.

15. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, a bearing housing, a bearing mounted o-n said bearing housing adjacent said rotatable member and arranged to support said rotatable member, and resilient means arranged adjacent said bearing for supporting said bearing housing on said stationary member, said resilient means having pseudo-harmonic characteristics and such resiliency and damping that the maximum deiiection at resonant critical frequencies thereof is substantially the same for both accelerating and decelerating conditions for any given unbalance and moment of inertia within its operating range.

l5. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft, a bearing mounted on said bearing housing adjacent said rotatable member and arranged to support said rotatable member, and resilient means arranged adjacent said bearing for supporting said bearing housing on said stationary member, said resilient means having pseudo-harmonic characteristics and such resiliency and damping that the resonant frequency and the maximum deflection at the resonant freouency thereof are substantially the same for both accelerating and decelerating conditions for any given unbalance and moment of inertia within its operating range.

1'7. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft, a bearing mounted on said bearing housing adjacent said rotatable member and arranged to support said rotatable member, and resilient means arranged adjacent said bearing for supporting said bearing housing on said stationary member, said resilient means having such resiliency and such damping that the deflection thereof is substantially constant and small at low speeds below a given speed and varies as a function of the speed above the given speed to a second given speed above which it varies gradually inversely as a function of the speed for any given unbalance and moment of inertia within its operating range.

18. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft, a bearing mounted on said bearing housing arranged to support said rotatable member, a iiexible resilient element comprising a laminated fabric disk having a central opening fitted about said bearing housing, means for securing said laminated disk to said bearing housing adjacent said opening therein, and means securing the outer edge of said laminated disk to said stationary member for supporting said bearing housing thereon.

19. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft, a bearing mounted on said bearing housing arranged to support said rotatable member, a resilient element comprising a laminated cotton fabric disk having a central opening fitted about said bearing housing adjacent said bearing, rigid rings arranged on each side of said laminated disk adjacent said opening therein securing together the inner edges thereof, means for securing the inner edge of said laminated disk to said bearing housing, rigid rings arranged on each side of said laminated disk adjacent the outer edge thereof securing together said outer edge, and means securing said outer edge of said laminated disk to said stationary member for supporting said bearing housing thereon.

20. A spinning device comprising an electric motor including a stationary member and a, rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft, a bearing mounted on said bearing housing arranged to support said rotatable member, a second axially extending housing secured to said stationary member and forming a lubricant reservoir about said bearing housing, a resilient element comprising a laminated cotton fabric disk having a central opening fitted about said bearing housing adjacent said bearing, rigid rings arranged on each side of said laminated disk adjacent said opening therein securing together the inner edges thereof, means for securing the inner edge of said laminated disk to said bearing housing, rigid rings arranged on each side of said laminated disk adjacent the outer edge thereof securing together said outer edge, means securing said outer edge of said laminated disk to said second housing for supporting said bearing housing thereon. and means for supporting said second housing.

21. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft, a bearing mounted on said bearing housing arranged to support said rotatable member, a second axially extending housing secured to said stationary member and forming a lubricant reservoir about said bearing housing, a resilient element comprising a laminated fabric disk having a central opening fitted about said bearing housing, means for securing said laminated disk to said bearing housing adjacent said opening therein, and means securing the outer edge of said laminated disk to said second housing for supporting said bearing housing thereon, said rotatable member having such mass and said bearing being so arranged that the center of oscillation of said rotatable member at critical speeds thereof is adjacent the point of intersection of a plane through the center of said laminated disk at right angles to the geometrical center line of said rotatable member and the geometrical center line of said rotatable member.

22. A spinning spindle comprising an electric motor including a stationary member and a r0 tatable member, a resilient element arranged to support said rotatable member on said stationary member, an axially extending casing forming a lubricant reservoir about said stationary member, and a resilient mounting member arranged to support said stationary member on said casing.

23. A spinning spindle comprising an electric motor including a stationary member and a rotatable member. means including an axially extending bearing housing for supporting said rotatable member, a second axially extending housing secured to an end of said stationary member and forming a lubricant reservoir about said bearing housing, a resilient element arranged to support said bearing housing on said second housing, and a resilient mounting member arranged to support said second housing.

24. A spinning spindle comprising an electric motor including a stationary member and a rotatable member, means including an axially extending bearing housing for supporting said rotatable member, a second axially extending housing secured to one end of said stationary member and forming a lubricant reservoir about said bearing housing, a resilient element arranged to support said bearing housing on said second housing, an axially extending casing arranged about said second housing, and a resilient mounting member arranged to support said second housing on said casing.

25. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft. a bearing mounted on said bearing housing adjacent said rotatable member arranged to support said rotatable member, a second axially extending housing secured to said stationary member and forming a lubricant reservoir about said bearing housing, means including a resilient element arranged adjacent said bear- .ing for supporting said bearing housing on said second housing, an axially extending casing arranged to provide a second lubricant reservoir about said second housing, and means including mounting member comprising a resilient diaphragm secured adjacent the outer edge thereof to said second housing and secured adjacent the center thereof to said casing for supporting said second housing on said casing,

26. A spinning device comprising a driving arrangement including a stationary member and a rotatable member, an axially extending bearing housing, a bearing arranged in said bearing housing to support said rotatable member, said stationary member being provided with a second axially extending housing secured thereto and arranged about said bearing housing, a resilient element arranged to support said bearing housing on said second housing, and a resilient mounting member arranged to support said second housing, said rotatable member having such mass and said bearing being so arranged that the center of oscillation of said rotatable member at critical speeds thereof is adjacent the point of intersection of a plane through the center of said resilient element at right angles to the geometrical center line of said rotatable member and the geometrical center line of said rotatable member.

27. A spinning device comprising a driving arrangement including a stationary member' and a rotatable member, an axially extending bearing housing, a bearing arranged in said bearing housing to support said rotatable member, a second axially extending housing secured to said stationary member and arranged about said bearing housing, a resilient element arranged to support said bearing housing on said second housing, and a resilient mounting member arranged to support said second housing, said resilient mounting member having such resiliency and said stationary member and said second housing having such mass that the center of percussion thereof is adjacent the point of intersection of a plane through the center of said resilient element at right angles to the geometrical center line of said rotatable member and the geometrical center line of said rotatable member'.

28. A spinning device comprising a driving arrangement including a stationary member and a rotatable member, an axiallyr extending bearing housing, a bearing arranged in said bearing housing to support said rotatable member, said stationary member being provided with a second axially extending housing secured thereto and arranged about said bearing housing, a resilient element arranged to support said bearing housing on said second housing, said rotatable member having such mass and said bearing being so arranged that the center of oscillation of said rotatable member at critical speeds thereof is adjacent the point of intersection of a plane through the center of said resilient element at right angles to the geometrical center line of said rotatable member and the geometrical center line of said rotatable member, and a resilient mounting member arranged t-o support said second housing, said flexible mounting member and second housing having such mass that the center of percussion thereof is adjacent the point of intersection of a plane through the center of said resilient element at right angles to the geometrical center line of said rotatable member and the geometrical center line of said rotatable member.

29. A spinning device comprising a driving arrangement including a stationary member and a rotatable member, an axially extending bearing housing, a bearing arranged in said bearing housing to support said rotatable member, said stationary member being provided with a second axially extending housing secured thereto and forming a lubricant reservoir about said bearing housing, a resilient element arranged to support said bearing housing on said second housing, said rotatable member having such mass and said bearing and flexible element being so arranged that the center of oscillation of said rotatable member at critical speeds thereof is adjacent the point of intersection of a plane through the center of said resilient element at right angles to the geometrical center line of said rotatable member and the geometrical center line of said rotatable member, an axially extending casing arranged about said second housing, and a resilient mounting member arranged to support said second housing on said casing, said resilient mounting member having such resiliency and said stationary member and second housing hav ing such mass that the center of percussion thereof is adjacent the point of intersection of a plane through the center of said resilient element at right angles to the geometrical center line of said rotatable member and the geometrical center line of said rotatable member.

30. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically exe tending shaft, upper bearing mounted on said bearing housing adjacent said rotatable inember arranged to support said rotatable member, a second bearing mounted on said bearing housing adjacent the lower end of said vertically extending shaft and arranged to support said rotatable member, a second axially extending housing secured to said stationary member and forming a lubricant reservoir about said bearing housing, a resilient element comprising a laminated fabric disk having a central opening itted about said bearing housing adjacent said upper bearing, means for securing said laminated disk to said bearing housing adjacent said opening therein, means securing the outer edge of said lam,- inated disk to said second housing for supporting said bearing housing thereon, said rotatable member having such mass and said bearings and resilient element being so arranged that the center of oscillation of said rotatable member at critical speeds thereof is adjacent the point of intersection of a plane through the center of said laminated disk at right angles to the geometrical center line of said rotatable member and the geometrical center line of said rotatable member, means for supplying lubricant from said lubricant reservoir to each of said bearings, and means including a mounting member comprising a resilient diaphragm secured adjacent the outer edge thereof to said second housing for supporte ing said second housing, said resilient mounting diaphragm having such resiliency and said stationary member and second housing having such mass that the center of percussion thereof is adjacent the point of intersection of a plane through the center of said laminated disk at right angles to the geometrical center line of said rotatable member and the geometrical center line of said rotatable member.

31. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft, an upper bearing mounted on said bearing housing adjacent said rotatable4 member arranged to support said rotatable member, a second bearing mounted on said bearing housing adjacent the lower end of said vertically extending shaft arranged to support said rotatable member, a second axially extending housing secured to said stationary member and forming a lubricant reservoir about said bearing housing, a resilient element comprising a laminated cotton fabric disk having a central opening fitted about said bearing housing adjacent said upper bearing, rigid rings arranged on each side of said laminated disk adjacent said opening therein securing together the inner edges thereof, means for securing the inner edge of said laminated disk to said bearing housing, rigid rings arranged on each side of said laminated disk adjacent the outer edge thereof securing together said outer edge, means securing said outer edge of said laminated disk to said second housing for supporting said bearing housing thereon, an axially extending casing arranged about said second housing, and means including a mounting member comprising a resilient diaphragm of resinous material secured adjacent the outer edge thereof to said second housing` and secured adjacent the center thereof to said casing for supporting said second housing on said casing.

32. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft, an upper bearing mounted on said bearing housing adjacent said rotatable member arranged to support said rotatable member, a second bearing mounted on said bearing housing adjacent the lower end of said vertically extending shaft and arranged to support said rotatable member, a second axially exten-ding nousn ing secured to said stationary member and forming a lubricant reservoir about said bearing housing, a resilient element comprising a laminated fabric disk having a central opening iitted about said bearing housing adjacent said upper bearing, means for securing said laminated disk to said bearing housing adjacent said central opening therein, means securing said laminated disk adjacent the outer edge thereof to said second housing for supporting said bearing housing thereon, means for supplying lubricant from said lubricant reservoir to each of said bearings, means for conductingy excess lubricant from said upper bearing to the upper surface of said laminated disk, means for returning excess lubricant from said upper surface of said laminated disk to said lubricant reservoir, and means including a mounting member comprising a resilient diaphragm of resinous material secured adjacent the outer edge thereof to said second housing for supporting said second housing.

33. A spinning device comprising an electric motor including a stationary member and a rotatable member having a vertically extending shaft, an axially extending bearing housing arranged about the lower portion of said vertically extending shaft, a bearing mounted on said bearing housing adjacent said rotatable member arranged to support said rotatable member, a sec-- ond axially extending housing secured tc said stationary member and forming a lubricant reservoir about said bearing housing, a resilient element comprising a laminated disk having a central opening tted about said bearing housing adjacent said bearing, means securing said lamv inated disk to said bearing housing adjacent said opening, means securing the outer edge of said laminated disk to said second housing for sup-- porting said bearing housing thereon, means for supplying lubricant from said lubricant reservoir to said bearing, means for conducting excess lubricant from said bearing to the upper surface of said laminated disk, means for returning ex cess lubricant from said upper surface of said laminated disk to said lubricant reservoir, an axially extending casing arranged to provide a second lubricant reservoir about said second housing, means including a mounting member comprising a resilient diaphragm secured adjacent the outer edge thereof to said second housing and secured adjacent the center thereof to said casing for supporting said second housing on said casing, and an opening in said resilient mounting diaphragm providing a communication between said rst-mentioned lubricant reservoir and said second lubricant reservoir.

` SVEN R. BERG-MAN.

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