US1667794A - Device for the synchronization of alternating-current machines - Google Patents

Device for the synchronization of alternating-current machines Download PDF

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Publication number
US1667794A
US1667794A US685489A US68548924A US1667794A US 1667794 A US1667794 A US 1667794A US 685489 A US685489 A US 685489A US 68548924 A US68548924 A US 68548924A US 1667794 A US1667794 A US 1667794A
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Prior art keywords
rotor
pawl
synchronizing
pendulums
synchronous
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Expired - Lifetime
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US685489A
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English (en)
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Michl Robert
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Individual
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Individual
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/118—Structural association with clutches, brakes, gears, pulleys or mechanical starters with starting devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
    • Y10T74/1529—Slide actuator

Definitions

  • nonna'r mom or KOSIGE, 'czncnosnovaxmf nnvrcr.
  • FOB ran SYNCHRONIZATION or AL'rEmm'rmo-coaaanr mncnmns.
  • small electric alternating current synchronous motors can be synchronized by simply causing them by hand to run, when excited by the working current,
  • centrifugal weights or 2 pendulums may for instance be used, such as are commonly used in speed governors.
  • These weights or pendulums, referred to below as synchronizing pendulums, may also be used for other purposes, for instancefor automatic starting, for operating the switch of the starting motor and the like.
  • the weights have not the form of balls as in Figs. 1 and 5, but, for economizing space, are made in the form of segments of a circular disc, which for the same reason move without a shaft on sliding surfaces at right angles to the axis and are not ke t in a state of equilibrium with the centrifugal force as in Figs. 1 and 5 by their own weight, but by spring action.
  • the synchronizing pendulums a are shown in Fig. 8 from below and are mounted on the under surface of the disc-shaped rotor '0 of the synchronous motor, so as to rotate about the pins or bolts 0!. Owing to this arrangement the pendulums move under the action of the forces in a plane at right angles to the axis of rotation. By this arrangement, not only the centrifugal forces due to the rotation, but the forces resulting from the movement and inertia of the synchronizing pendulums a act in the same direction as the centrifugal forces, which latter forces are thereby magnified.
  • the rotor of a single or polyphase synchronous motor or generator be provided with the synchronizing pendulums a, a and a shown in Figs. 1, 3, 4, 5, 7 and 8, according to one of the arrangements referred to, it is sufiicient to bring it, when excited, either by hand or by motive power, to a speed of revolution, which is not less than the synchronous speed.
  • the getting into phase is effected automatically by the action of the synchronizing pendulums, while at the same time the pendulums prevent hunting and .1 getting out of phase.
  • the motor may be started readily by hand by means of the devices shown in Figs.
  • the pawl e is caused to disengage from the ratchet wheel by the inertia of the pendulum f at the moment, in which the cam swell It strikes against the stop m, on the spring contracting again.
  • the rotation of the milled head a" by hand is transmitted through the two toothed wheels 11. and n directly by way of the pawl e and the pendulum f, which is not shown, to the rotor c.
  • the synchronizing pendulums a may hands, when the drive of the clock is tem-- porarily interrupted.
  • w and w are the terminals of the drivin alternating current connected with the win ing a: of the synchronous motor, by conductors 20 and 21 and fuses y and y.
  • the electromagnetic starting device may in this case consist, as is shown for instance in Figs. 5 and 6, of an elect-romagnet g the coils of which are connected in series and also on the one hand with the fuse 3 by conductor 22 and on the other hand with a stationary contact 23 by a conductor 24.
  • a relatively movable contact 25 is attached to the lever p and is connected with the terminal of the fuse y by a conductor 26.
  • the armature r of the electromagnet transmits its attractive force through the lever ,9, the pawl e and the pendulum f, already described in connection with the hand starting device, and the ratchet wheel Z to the rotor c.
  • the pawl e and the pendulum 7 which controls the pawl directly, for instance by its enertia, are mounted on a two-armed armature a, which is mounted symmetrically on the shaft t, by which means, not only the mechanical transmission resistances between the electromagnet armature and the pawl e are overcome,
  • the synchronizing pendulums described above can also be used for preventing hunting and a getting out of phase in the case of larger synchronous generators and motors as well, in which the synchronization 1s to be effected with the means ordinarily employed for this purpose, such as phase volt meters, phase lamps and the like.
  • an alternating current synchronous machine including a rotor and a separate automatically varying synchronizing centrifugal pendulum adapted to impart to the rotor an additional variable inertia moment increasing and decreasing with the speed of revolution of the rotor.
  • an alternating current synchronous machine includin a rotor a separate synchronizing centri gal pendulum adapted to impart to the rotor an additional variable inertia moment increasing and decreasing with the speed of revolution of the rotor, starting means adapted to impart to the rotor and to the centrifugal pendulum an impulse not less than the synchronous speed of the motor, a pawl and ratchet wheel mechanism inserted between thesaid starting means at the one side and the rotor and the synchronizing pendulum at the other side, means for throwing the pawl and ratchet mechanism into or out of enga 'ement.
  • an alternating current synchronous machine including a rotor and means for transmitting the rotation of the rotor to a clockwork-mechanism, a separate synchronizing centrifugal pendulum adaptma netic starting means and the said secon ary driving means, in such a way, that an undue slackening speed of the synchronizing pendulum sets the secondary driving means free for action on the clockwork mechanism and closes the circuit of the electromagnetic starting means, whilst the normal speed of the synchronizing pendulum arrests the said secondary driving means.
  • an alternating current synchronous machine means by which an inertia moment is imparted to the rotor of the machine, which inertia moment increases and decreases with the speed of revolution of the rotor, said means consisting of centrifugal and inertia pendulums, auxiliary fiy-weights, a pawl and ratchet mechanism and means connecting the latter with the said auxiliary fly-weights whereby the pawl is automatically caused by inertia to engage with the ratchet, on the auxiliary force coming into operation and to be automatically re eased by the inertia, after the said auxiliary force has ceased to act, as set forth.
  • the electromagnetic means includes an electromagnet and a pivoted armature, the pawl of the pawl and ratchet mechanism being mounted directly on the said armature, as set forth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor And Converter Starters (AREA)
US685489A 1923-01-12 1924-01-10 Device for the synchronization of alternating-current machines Expired - Lifetime US1667794A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1667794X 1923-01-12

Publications (1)

Publication Number Publication Date
US1667794A true US1667794A (en) 1928-05-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
US685489A Expired - Lifetime US1667794A (en) 1923-01-12 1924-01-10 Device for the synchronization of alternating-current machines

Country Status (3)

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US (1) US1667794A (de)
AT (1) AT98630B (de)
CH (1) CH107077A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2478346A (en) * 1943-08-04 1949-08-09 Hartford Nat Bank & Trust Co Starting device for non-self-starting phonograph motors
US2834896A (en) * 1955-09-28 1958-05-13 Sigma Instruments Inc Stepping motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2478346A (en) * 1943-08-04 1949-08-09 Hartford Nat Bank & Trust Co Starting device for non-self-starting phonograph motors
US2834896A (en) * 1955-09-28 1958-05-13 Sigma Instruments Inc Stepping motor

Also Published As

Publication number Publication date
CH107077A (de) 1924-10-01
AT98630B (de) 1924-11-25

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