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    Reciprocating motor with excursion multiplication
    5.
    发明授权
    Reciprocating motor with excursion multiplication 失效
    回转电动机与励磁多路复用

    公开(公告)号：US3573514A

    公开(公告)日：1971-04-06

    申请号：US3573514D

    申请日：1969-05-12

    Applicant: MOTOROLA INC

    Inventor： RACE RICHARD T

    IPC: F04B9/06 ,  F04B35/04 ,  H02K33/00 ,  H02K33/04

    CPC classification number: F04B9/06 ,  F04B35/04 ,  H02K33/00

    Abstract: A reciprocating motor for a refrigerator compressor operates in response to alternating current signals applied either to an electromagnet or to a bilayer piezoelectric crystal mounted within the motor housing. The armature of the electromagnet and a plate driven by the bilayer crystal are arranged for limited excursions in an amount which normally would be insufficient to provide sufficient output to the piston of a compressor. The armature or the plate, however, are connected to a compressor piston through a power drive spring which is caused to have a resonant frequency of vibration equal to the frequency at which the armature or the crystal is driven. The drive spring then amplifies the movement of the armature or plate to cause the piston driven thereby to have a substantially greater excursion of reciprocation than the driving armature or crystal, thereby providing sufficient physical piston displacement to operate the compressor.

    Electronically tuned antenna system
    9.
    发明授权
    Electronically tuned antenna system 失效
    电子调谐天线系统

    公开(公告)号：US3571716A

    公开(公告)日：1971-03-23

    申请号：US3571716D

    申请日：1968-04-16

    Applicant: MOTOROLA INC

    Inventor： HILL FRED P ,  RACE RICHARD T

    IPC: H03H7/38 ,  H03H7/40 ,  H04B1/18

    CPC classification number: H03H7/40 ,  H03H7/38 ,  H04B1/18

    Abstract: A tank circuit for the aerial of a radio receiver includes a transformer located in a housing positioned at the bottom of the aerial with the primary winding electrically connected to the aerial. A voltage variable capacitor is connected across the primary winding. The secondary winding of the transformer is connected by a coaxial cable to the radio receiver which is remotely positioned from the aerial. A direct current potential from a potentiometer in the radio receiver is coupled through the coaxial cable to the voltage variable capacitor for tuning the antenna tank circuit over a predetermined frequency band. The selected RF signal in turn is coupled from the secondary winding of the transformer through the coaxial cable to the radio receiver.

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