US956686A

US956686A - Phase-splitter.

Info

Publication number: US956686A
Application number: US24925805A
Authority: US
Inventors: Henry H Cutler
Original assignee: Cutler Hammer Manufacturing Co
Current assignee: Cutler Hammer Manufacturing Co
Priority date: 1905-03-09
Filing date: 1905-03-09
Publication date: 1910-05-03
Anticipated expiration: 1927-05-03

Description

UNITED STATES PATENT oFFroE.

HENRY H. CUTLER, F MILWAUKEE, WISCONSIN, ASSIG'NQR 2 0 THE (BUTLER-HAMMER um. 00., or xrnwa'oxnn, wIscoNsm, a CORPORATIQN or isconsin.

PHASE-SPLITTER.

' Specification. Letters Patent. Application filed March 9, 1905. serial no, 249,258.

Patented May3, 1910.

of which the following is a full, clear, con

cise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to improvements in means for starting single-phase induction motors, my object being particularly to provide a simple and efficient phase splitter for starting a motor of this character and con trolling the same.

In the accompanying drawing I have illustrated diagrammatically one design for carrying out my invention. 7 Y I have shown in said figure, diagrammatically, a single phase induction ,motor, having, say, four :field coils, 1, 2, 3 and 11. :I have selected this number of coils merely for the ,purposeof illustration and have not illustrated the rotor or secondary member of the-motor, but it will be understood .thatthe usual secondary element of a single ,phase motor is contemplated. \Vith the supply main'5, a resistance 6 is connected and, ikewise, a resistance 7, which is subdivided into a plurality of sections, said sections being connected with terminals orvcontact buttons 8. A third resistance 9 is also employed and is likewise subdivided into sections which are connected with the terminals or contact buttons 10. One of these resistances, as, for instance, resistance 7, is non-inductive in character, while the resistance -9 is inductive in character. The resistance 6 may be non-inductive and is for the purpose of reducing the potential supplied to ,the field of the motor at starting.

The contact arm 11 is provided with a contact in the form of a brush connected. by

conductors

12, 12 through the field windings '1 and 2, thence by conductor 13 to

terminals

14 and 15, thence across the bridge 16, to terminal 17, thence by conductor 18 to the Opposite side 19 of the supplgcir cuit. The contact arm 11 carries a ush 19, adapted to sweep over the terminals 10, this contact being connected by conductor '20 with a contact in the form of a brush 21, which is adapted to sweep ot er the contact bar 22, which bar is connected by con- 1 main 19 'ductor 23 through the windings 3 and it, thence by conductor 24 to conductor l8 and When the contact arm 11 has been moved ,to the extreme position 5120 the right, the brush thereof. engages the terminal 25, the brush 19 engages the terminal 14 and the spring pressed bridge contact 16 is moved out of engagement with the terminals 15 and 17 by means of the contact arm moving against the projection 16 of said bridge contact. hen (the contact arm is in its full on position it ,is held by a retaining magnet 26, the armature pieces 26 of which engage the piece of magnetic material 26 .on the contact arm. The retaining magnet may be supplied with a direct current in any suitable manner. I have the present instance is illustrated diagrammatically as a rectifier of the aluminum iron type, in which the longer transverse lines 28 represent, say, iron, while the shorter lines 29 represent aluminum. The current from the alternating currentsupply will pass between these metals =in.one,d1rection only. Accordingly, with the-cells disposed as illustrated, a rectified current w ll be delivered to the retaining.magnet 26,.sa1d rectifier being connected in the supply circuit 30 and 31, connecting the mains 5 and 19 with the magnet 26.

The operation of starting the motor is as follows: The parts being initially as shown in the figure, the operator moves the contact arm 11 to the right, accordingly cuttlng 1n the resistances 7 and 9 in the field circuits. Circuit is closed from the main 5 through the resistance 6, resistance 7, conductor 12,

field windings 1 and 2, conductor 13, terminalsl t and 15, bridge 16, termlnal 17, and by conductor 18, to the opposite ma1n '19. Also, circuit is closed from the mam 5 through the resistance 6, resistance 9, brush 19, conductor 20,-brush 21, contact 22, conductor 23, field windings 3 and 4, conductors 24 and 18, to the opposite mam 19. Since the resistance 7 is non-inductive, while the resistance 9 is inductive, the current passing through the resistance 9 will be retarded 1n phase, and accordingly, the field windings are subjected to currents of-d1fferent phase which produce a revolving magnetic field to the full on position, the bridge 16 is moved out of engagement with the terminals 15 andl7, and the fields are thereb connected in series, the resistance 6 being at the same time removed from circuit so that the full voltage of thesupply circuit is imposed upon the circuit containing the field windings. This circuit may be traced from main 5 to terminal 25, thence by. conductor 12, through the field windin s l and 2, conductor 13, terminal 14, brus 19, conductor 20, brush 21, contact 22, conductor 23, field windings 3 and 4, conductors 24 and 18, back 'to the opposite main 19,

of the supply circuit. T e retaining ma et 26 serves to retain the contact arm 11 in the full on position. The connections of the auto transformer may be utilized in the well known manner for reducing the pressure at starting. It will thus be seen that the motor is brought to full s eed without load and without unduedistur ance of the pressure of the distributing circuit.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. The combination with an alternating current motor, of a phase splitter for starting said motor, adapted to connect the field windings of said motor in parallel paths,

and comprising a separateresistance for each.

the motor. 'As the contact arm is of said paths, said resistances being such as to supply said field windings with currents of di erent base, a resistance common to each of said first resistances for reducin the volta e of the current supplied to said field windings when connected in arallel, and a single movable member for adjusting said resistances.

2. The combination with an alternating current motor, of a phase splitter for starting the same, adapted to connect the field windings of said motor in two parallel paths, and comprising an adjustable inductive resistance arranged in one of said paths, an adjustable non-inductive resistance arranged in the other of said paths, a third resistance common to both of said paths for decreasing the voltage of the vcurrent supplied to said windings when connected in parallel relation and a single movable member for adjusting said resistances.

3. The combination with an alternating current motor, of a phase splitter for start ing the same, adapted to connect the field windings of themotor in two parallel paths, andcomprising an adjustable inductive resistance arranged in one of said paths, an adjustable non-inductive resistance arranged in the other, of said paths, a third resistance common to both-of said paths for reducing the volta e of the current supplied to said field. win gs, and means for removing all of said resistance from the circuit of said field windings and connecting said field windings in series.

In witness whereof,- I have hereunto subscrlbed my name in the presence of two wlt- F. S. WILHOIT, T. E. BABNUM.