US678034A - Induction-motor. - Google Patents

Description

Patented Iuly 9, mm.

No. 678,034. l

H. G. REIST.

INDUCTION MOTOR.

(Application led Nov. 28, 1898.)

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UNiTnD STATES .PATENT Orrrcn.

HENRY G. REIST, OF SCHE'NECTADYLNEVVA YORK, ASSIGNOR TO THE GENERAL ELECTRIC COMPANY, OF NEW YORK. Y

` INDUCTION-Moron.

SPECIFICATION forming part of Letters Patent No. 678,034, dated July 9, 1901. Application iiledNovemlaer 28,1898. Serial No. 697,624. (No model.)

tady, in the county of Schenectady, State ofl New York, have invented certain new and useful Improvements 'in Induction Motors, (Case No. 662,) of which the following is a specification.

The present invention :relates to starting and controlling resistances for alternatingcurrent induction-motors and has reference particularly to the means for supporting the same within-the revolving member of the motorand to the means for varying the amount of resistance in 'circuit with the induced winding.

The invention consists more particularly in details of construction and is eXempliiied in'the mechanical arrangement illustrated in the accompanying drawings, in which-Y Figure 1 is a sectional vview of a motor embodying my invention; Fig. 2, a view in end elevation. Fig. 3 is a View of the circuit connections of the induced member, and Fig. 4 is a plan view of the resistance-grid.

Referring to the drawings, B denotes the main supporting-frame'of an induction-motor of well-known type and having bolted to one side thereof a clamping-plate B for securing in place the laminated structure-C,

forming the core of the inducing member of A portion of the primary Windthe motor. ing is indicated at D. The side plates A are bolted to the supporting-frame B and serve to protect the operating parts of the machine from injury. The particular construction of the primary member is, however, immaterial so far as my present invention is concerned.

The revolving or induced member of the motor consists of the usual laminated toothed structure E, supported by end rings G', which .rior of the inducing member by means of a special forln of supporting-frame, each frame 'and associated parts being located between two of the arms I of the spider. This frame consists of a rectangular portion constructed with cross-bars and interveningspaces, so as .to give lightness. Stiffening-ribs S are used to give rigidity. A cross-piece T arches over from one side to the other of the supportingframe and has a forked lug, through which fbolts H pass and by which one end of the frame is secured to the ring G. The opposite end of the supporting-frame is secured by bolts F to lugs formed integral with the ring G', as clearly shown in the drawings. Depending from each supporting-frame are two arms K, connected together by a crossbar K', formed integral therewith and having extensions projecting therefrom parallel `with the main portion' of the supportingframe, as best shown at oi, Fig. l. The L- shaped support thus carried by the depending arms K serves to support the contacts which are electrically connected to the resistancegrid I, carried by the main supporting-frame, as shown in Fig. l. This resistance-grid I (shown in detail in Fig. 4.) consists of a casting having the form of a strip bent back and forth on itself and forming a series of parallel conductors connected in series from one end of the grid to the other. The conductors are shortened at intervals to aord spacefor certain of the bolts I3, which serve to secure the grid to its supportingframe. The two outside bolts at one side of the grid pass through the lugs t6. These bolts are insulated from the grid, except at the point C, Fig. l, at which is interposed a metallic washer, which serves to electrically connect one end of the grid to its supporting-frame. The other end of the grid is electrically connected at T to the lead l2., which makes con--` nection with the induced winding in a wellknown manner. Intermediate points z3 and 9 are connected by leadsz' i with the contacts 2, carried by the depending portion of the supporting-frame and insulated therefrom by plates of insulating material 3. One extremity of the grid is connected through the lead I2 with the contact-block I4,while the opposite end of the grid is put in connection with the contact-blocl through the washer C, the supporting-frame itself, and the bolts Z), which are in contact electrically with said contact-blocks and screw into the supporting-frame. Since, however, one end of each resistance-grid is in electrical connection with the frame of the machine, as described, the block @"5 serves less as a contact-block than as a guide for the contact-brush operating in conjunction therewith and hereinafter to be described.

The value of the starting resistance in circuit withthe induced member is varied by electrically connecting together corresponding points in each of the three resistances I. In Fig. 3 I have diagrammatically illustrated the circuit connections between the resistance-grids and the winding of the induced member. A plurality of brushes Q, electrically connected to each other and movable over the contacts and I4, serve to control the resistance connections. The brushes Q, are carried by a ring R, surrounding the shaft J and movable longitudinally thereon. The ring is prevented from rotating about the shaft by means of the heads of two screws M, so cut away as to form lugs fm, which project into and engage the sides of a slot J, formed in the said shaft, as shown clearly in the drawings. In order to allow the screws M to be putin place, the edges of one end of the slot in the shaft J are scooped out or cnt away, as shown in section in Fig. 2, so as to receive the heads of the screws and allow the same to be turned. After the screws have been secured in position in the ring R the same is moved along the shaft, so that the lugs m of the screws engage the sides of the c slot, and are thus prevented from turning.

Movement is communicated to the ring R by means of a cross-bar L, sliding in the slot of the shaft J and having notched ends L engaging the lugs m, as shown in Fig. 1. The cross-bar L is secured in any suitable manner to one end of a rod K2, which slides in a hole J2, drilled concentric with the shaft J and extending into the same a distance slightly beyond the slot J2. A handle or knob K2 is swiveled to the projecting end of the rod K2, so as to allow the rod to turn Without turning the knob.

When the entire starting resistance is in circuit, the brushes and contacts have the relation shown in Fig. l. When it is desired to cut out the resistance, the rod K2 is pushed into the shaft a distance sufficient to cause the brushes Q to connect together the first set of contacts f2, thus cutting out approximately half of the resistance. Further movement of the rod K2 connects together the middle point of the remaining portion of each resistance, while a still further movement of the rod K2 cuts out the resistance entirely by connecting each of the blocks Il together, and thus connecting the leads I2 directly to each other.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In an alternating-current motor, the com* bination of a hollow revolving member, a snpporting-frame secured to the interior of the revolving member, a resistance carried by said frame, arms projecting from said frame, contact-blocks carried by said arms and electrical connections between said contactblocks and resistance.

2. In an alternatingcurrcnt motor-,the combination ofa hollow revolving member, a plurality of supportingframes independently secured to the interior of the revolving member, resistances carried by said supporting frames, contact-blocks also carried .by said supporting-frames and located out of the planes of said resistances, and contactbrushes carried by a device sliding on the shaft of the motor and engaging said contactblocks.

In an alternating-current motel-,the combination of a hollow revolving member, aplnrality vof supporting-frames secured to the interior of said member, resistance grids mounted on said frames,arms projecting from said frames toward the shaft on which said member is mounted, contacts carried by said arms and electrically connected to said grids, and brushes for said contacts slidingly mounted on the shaft.

In testimony whereof I have hereunto set my hand this 22d day of November, 1898.

HENRY G. REIS'I.

Witnesses:

B. B. HULL, A. H. ABELL.

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