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    Single-phase electric motor
    2.
    发明授权
    Single-phase electric motor 失效
    单相电动机

    公开(公告)号：US3614494A

    公开(公告)日：1971-10-19

    申请号：US3614494D

    申请日：1970-05-18

    Applicant: DANFOSS AS

    Inventor： BORCHERS ALWIN ,  SJOTUN KYRRE GUTTORM ,  HANSEN GUNNAR LYSHOJ ,  CLAUSEN JORGEN RONO

    IPC: H02K7/08 ,  H02K17/04 ,  H02K17/00

    CPC classification number: H02K16/02 ,  H02K7/085 ,  H02K17/04

    Abstract: The invention relates to a single-phase electric motor assembly for installations such as oil burners. The motor has two oppositely rotatable rotors with one rotor adapted to drive a blower and the other adapted to drive an oil pump. The stator has main and secondary windings offset from each other which are switchable on and off together. The current phase in the secondary winding leads by up to 20* upon startup and remains above 0* at the highest operating voltage. There is a time lag during which the blower rotor builds up speed and it is only thereafter that its rotary field acts on the pump rotor to drive it in the opposite direction. Alternate hydraulic and mechanical means are provided for making the pump effective in only one operating direction.

    Oil burner system with motor-driven pump controlling bypass valve
    3.
    发明授权
    Oil burner system with motor-driven pump controlling bypass valve 失效
    具有电动泵控制旁路阀的油锅炉系统

    公开(公告)号：US3617154A

    公开(公告)日：1971-11-02

    申请号：US3617154D

    申请日：1968-05-09

    Applicant: DANFOSS AS

    Inventor： SJOTUN KYRRE GUTTORM

    IPC: F23K5/14 ,  H02K7/12 ,  B05B9/00

    CPC classification number: F23K5/142 ,  H02K7/125

    Abstract: An oil burner system in which a fuel oil pump and the air blower are independently driven by a common motor having a single stator and two independently driven rotors. One rotor is connected to the pump and the other to the air blower so that the inertia of the pump drive is reduced and it comes to a stop quicker. The rotor for driving the pump is disposed in an oil-filled compartment so that it is damped. The system is provided with a bypass valve connecting the discharge side of the pump with its suction controlled by the motor shaft which is biased to open the bypass valve when the motor is in a deenergized condition. When the motor is energized the shaft is attracted axially electromagnetically and it closes the bypass valve. When the motor is deenergized it opens the bypass valve, the pump stops relatively quickly and the blower continues to blow air to ensure burning of all oil supplied from the burner and avoid coking on the burner and elsewhere.

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