. Automotive industries . lp toclose them, and is a very important consideration in thedevelopment of rotating types of interrupters. The force Fm is the most difficult to control. At thehigher speeds it may become greater than Fs plus F0and cause the bumper motion to exceed the amount force depends upon the mass of the lever armswinging upon its pivot and upon the rate of bumper mo-tion M. It is controlled to some extent by making thelever arm as light as possible without sacrificing mechan-ical strength. It is no doubt this force that is responsi-ble for the vibrations of the contact
. Automotive industries . lp toclose them, and is a very important consideration in thedevelopment of rotating types of interrupters. The force Fm is the most difficult to control. At thehigher speeds it may become greater than Fs plus F0and cause the bumper motion to exceed the amount force depends upon the mass of the lever armswinging upon its pivot and upon the rate of bumper mo-tion M. It is controlled to some extent by making thelever arm as light as possible without sacrificing mechan-ical strength. It is no doubt this force that is responsi-ble for the vibrations of the contacts that was previous-ly discussed. In order to make a direct comparison, let us assumethat it is desirable to have the contacts opening thesame amount for the same amount of angular rotation ofthe magneto rotor in the case of the stationary inter-rupter and rotating cam. Under this condition, whichis represented in Fig. 8, the rotating cam will force thebumper along its contour OA, so that the angle at which STATIONARY CAM. CENTER OFROTATION ROTATING CAMSTATIONARY BUMPER Fig. 8—Illustrating difference between rotating andstationary breakers. 1110 AUTOMOTIVE INDUSTRIESTHE AUTOMOBILE May 26, 1921 ARM SPRING ARM RETAINING CLAMP SCREW CONNECTING SCREW
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
