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    8.
    发明专利
    未知

    公开(公告)号：DE1209595B

    公开(公告)日：1966-01-27

    申请号：DEA0046390

    申请日：1964-06-23

    Applicant: ASTRO DYNAMICS INC

    Inventor： KATZ LEONHARD

    IPC: H02H7/122 ,  H02M7/519 ,  H03K17/73

    Abstract: 1,062,454. Transistor oscillator circuits. ASTRO-DYNAMICS Inc. June 23, 1964 [June 24, 1963], No. 25929/64. Heading H3T. [Also in Division H2] A push-pull oscillator or switching circuit, particularly for providing power for an A.C. motor, is provided with means for protection against both switching devices becoming conductive simultaneously. As shown in Fig. 1 (not shown), an A.C. motor has a main stator winding 14, a rotor winding 20, a starting winding 16 and a feedback winding 28 arranged so as to permit electronic switches such as transistors or semi-conductor controlled rectifiers 10, 12 to act as a self-oscillating circuit. Switches 10, 12 become conductive alternately so as to connect the D.C. supply 34 alternately to points A, C of the stator winding 14. In the event of excess load on the motor causing both switches 10, 12 to become simultaneously conductive, relay R becomes energized, disconnecting the supply 34 for a period depending on the discharge time of capacitor 48. In Fig. 2, switches 10, 12 are driven by an external oscillator.

    Trans-synchronous motor appts. using time staggering technique - generates speeds which are fractions of synchronous speeds using triacs, logic circuit and crossing detector
    9.
    发明专利
    Trans-synchronous motor appts. using time staggering technique - generates speeds which are fractions of synchronous speeds using triacs, logic circuit and crossing detector 未知

    公开(公告)号：FR2500234A1

    公开(公告)日：1982-08-20

    申请号：FR8103115

    申请日：1981-02-17

    Applicant: ASTRO DYNAMICS INC

    Inventor： KATZ LEONHARD ,  ORMORD LAWRENCE A

    IPC: H02P6/08 ,  H02P27/02 ,  H02P7/62 ,  H02K19/02

    Abstract: In one example of a preferred motor three symmetrically geometrically displaced windings A,B and C with six magnetic pos, connected in Y-fashion. Clearly the device may be used with other types of winding connections and other even numbers of magnetic poles. The windings have their output terminals connected to a power source AC - in this case, a single phase source - with the AC neutral line, so-labelled, at the common connection point P' of the windings A,B and C. Triacs or other switching devices a, b and c respectively connect the inner pole terminals of the respective windings A, B and C with the common point P'. The respective switching triacs a, b and c are triggered from leads III, IV and V of the output of a three-phase ring counter RC, controlled by the output II of a zero-axis-crossing detector D that produces a pulse for each zero-crossing of the waveform I of the input 60-cycle line.

    10.
    发明专利
    未知

    公开(公告)号：DE1930922A1

    公开(公告)日：1970-12-23

    申请号：DE1930922

    申请日：1969-06-18

    Applicant: ASTRO DYNAMICS INC

    Inventor： KATZ LEONHARD

    IPC: F25B23/00 ,  F28F13/00 ,  F28F27/00 ,  H01J19/36 ,  H01S3/04 ,  H01S3/042 ,  H05K7/20

    Abstract: A heat radiating object is cooled by allowing a gas to flow in heat exchange contact with the object in an enclosed space. The absolute pressure of the gas in the space is adjusted to at least 2 atm. in an area in which the pressure-viscosity, pressure specific heat, and pressure thermal conductivity curves of the gas remain virtually constant whilst the controlled absolute pressure in the space during the flow is maintained. Specif. the object is in the path of the gas flow, the latter containing nitrogen, or hydrogen, helium, oxygen or air.

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