US1244478A - Controller. - Google Patents

Description

i. DEUTSCH.

CONTROLLER.

APPLICATION FILED MAR. 7. i913- 1,244,478. Patented 001;. 30,1917.

2 SHEETS-SHEET I.

Fiql.

INVENTOH ZATTORNEY l. DEU'TSCH.

CONTROLLER.

APPLICATION man MAR. I, 1913.

1,244,478. Patented Oct. 30, 1917.

2 SHEETSSHEET 2.

7. 'ATTORNEY UNITED STATES PATENT onrron.

ISIDOR DEUTSCH, OF AVALON, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELEC- TRIO AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

CONTROLLER.

Specification of Letters Patent.

Patented Oct. 30, 1917.

Application filed March 7, 1913. Serial No. 752,637.

To all whom it may concern:

Be it known that I, ISIDOR DEUTSCH, a citizen of the United States, and a resident of Avalon,'in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Controllers, of which the following is a specification.

My invention relates to controllers of the drum type for electric motors and it has for its object to provide a simple and practical structure in which the armature and field resistors are mounted inside or upon the controller drum.

In the usual type of controllers, the field and armature resistors are placed outside the controller structure. This construction necessitates a multiplicity of both contact members and leads between the resistors and contact members.

In my invention, I propose to use a drum, the body of whichis composed of cement or other insulating material and which supports the armature and field resistors either upon its exterior surface or within openings or tubes.

In the drawings, Figure 1 is a side view, partly in section, of the controller. Fig. 2 is an end view of the drum partly in section. Fig. 3 is a diagram of the connections. Fig. 1 is a detail View of the contact members connected to the field resistor. Fig. 5 is a detail view showing the method of connecting certain of the contact members to the armature resistor. i

The drum comprises acylindrical body 1 supported by a shaft 2 which has a bearing 3 in one end of a casing 4 and a bearing 5 in the cover 6 of the casing. A handle 7 serves to rotate the shaft and drum. The body of the drum is composed of cement or other suitable insulating material in which are. openings or tubes 9,.in each of which are mounted the armature resistor units in pairs. In the preferred form, the units are composed of porcelain tubes 10 supported by bolts 11 passing through plates 8, with wash ers 12 between the bolts and the tubes. The resistance material, which is preferably nichrome wire, is wound upon the exteriors of the tubes. The members of each pair of units are in series, while the terminals of the pairs are connected to bars 14 embedded in the body 1, as shown in Fig. 5, which are connected to four pairs of contact pieces 15 on the outer surface by bolts 01' screws 16. The contact pieces are thus connected to divide the resistor into four approximately equal parts, each composed of a pair of units. At the opposite end of the drum are mounted the units of the field resistor 17. In the form shown, tubes 18 composed of insulating material, contain cylinders 19, also of insulating material, upon which are wound the resistance wire 20. The tubes are connected to the body of the drum by bolts or screws 21 connected with five pairs of contact pieces 22, as shown in detail in Fig. 1, the wire 20 being connected to the bolts 21. As diagrammatically shown in Fig. 3, the field resistor is divided into five approximately equal parts by the points connected to the contact pieces.

Between the row of contact pieces 15 connected to the armature resistor and the row of contact pieces 22 connected to the field resistor, are contact strips 23, 24 and 25 which are fastened to the body 1 by screws 26 and are arranged to coact with contact fingers 27, 28 and 29, respectively. The contact pieces 15 are alined with contact strips 30, and the contact pieces 22 are alined with contact strips 31, which engage contact fingers 32 and 33, respectively, during the rotation of the drum. The contact finger 32 is connected to the negative side of the line, while the finger 29 is connected, through the series field winding 31 of the motor 35, to the positive side of the line. The finger 27 is connected to one terminal of the motor and to the shunt field winding 36 of the motor, vhile the contact fingers 28 and 33 are connected, by a common lead, to the other motor terminal. Four leads 37 extend from the drum to the motor through an insulated opening 38 in the casing 4 to make the connec'tions above described. The contactor pieces and contact strips are mounted on ribs 39 formed on the periphery of the drum. An arc shield 40 is placed between the contact fingers 32 and 27.

The operation of the device is as follows: When the handle is rotated in either direc tion, for example, to the left, from the cen tral or 011 position, and the several contact fingers are engaged by the first of the contact pieces 15 and the several contact strips, the electrical connections of the motor are made. A circuit will be established from the negative side of the line through the finger 32, first contact piece 15, through armature resistor 13, strip 24, finger 28,the armature of the motor 35, finger 27, strip 23, strip 25, finger 29, through the series field winding 34: to the positive side of the line. The shunt field circuit is established from the fixed connection 41, through the shunt field Winding 36 to contact strip 31 and finger 33, to the other terminal of the motor. \Vhen the drum is rotated farther in the same direction, the armature resistor is first gradually cut out, as the contact pieces 15 are engaged in succession by finger 32 and, when the finger engages the strip 30, the armature resistor will have been entirely cut out. As the controller handle is moved farther toward the running position, the finger 33, which has been in contact with the strip 31, will then be engaged in succession by the contact pieces 22 and the field resistor 20 will be gradually inserted in series with the shunt field winding. The position for maximum speedwill, of course, be at the end of the travel or when the en tire resistor 20 has been inserted to weaken the field. When the operator desires to stop the motor, and the handle is moved from the maximum-speed position to the off position, the reverse operation will take place. The field resistor will be gradually cut outand,after that operation has been completed, the contact finger 32- Will be successively engaged by the contact pieces 15, again inserting the armature resistor in series with the line and bringing the motor to a gradual stop. \Vhen the handle is rotated to the right, the connections reverse the direction of rotation of the motor but the sequence of operation is the same. 7

Simplicity is one of the advantages of this construction, since the multiplicity of leads and contact members, such as is found in the usual construction, is avoided. The resistor units can be easily removed for repair or examination. There is also an economy of space, since they resistors are placed in a space which could be used for no other purose.

p It will be understood that this type of drum is adapted especially to motors of small size. For motors of over 25 H. P., a grid resistor will probably be required which could not, of course, be placed in the drum.

While I have described the preferred form of my invention and specified the materials which I prefer to use, it- :is understood that Lmay use any other materials which perform the :same functions. Vhile I have in ifiorm of tubes or cylinders, it is understood that the resistance material may be wound in any other suitable manner. Various other changes may be made Within the scope of the appended claims.

As shown,thc armature resistor is in four parts, each part wound on two porcelain cylinders mounted in the same opening or tube 9 in the drum. This arrangement is illustrative only, as any other grouping of the resistor units may be used, as re quired. The field resistor may be embedded in the cement or placed in tubes as desired.

I claim as my invention:

1. A. controller drum comprising a body portion of molded material, a resistor inclosed by said molded material but detachable therefrom, contact, members mounted on said body portion and connected to said resistor, and means for rotating said drum.-

2. A controller drum comprising a body portion of insulating material havm openings, resistors detachably mounted in said openings, and contact members mounted on said body portion and connected to said resistors.

3. A controller drum comprising a body portion having recesses, an armature resistor in said recesses, a field resistor for an elec-v tric motor supported by said body porti contact members on said body portion, an connecting means for said resistors and saidmembers embedded in said body portion.

l. In a controller drum, the combinationwith a cylindrical body portion of insulwting material having openings, and an armature resistor in said openings, of a field resistor supported by said body portion, and contact members connected to said resistors.

5. In a controller, the combination with a cylindrical drum having a body portion of insulating material having recesses, armature and field resistors for an electric motor supported by said body portion, one of said .resistorsbeing mounted in said recesses, and annular ribs on said body portion, of contact members on said ribs, means for connecting said resistors and said contact members, and contact fingers for engaging said contact members.

6. A controller comprising a rotatable body portion of insulating material having longitudinally extending recesses, resistor units mounted in said recesses and detachably connected to said body portion and contact members carried by said body portion and connected to said resistors.

7. A controller comprising a rotatable having recesses, resistor units mounted in subscribed my name this 26th day of Febsaid recesses and spaced from the sldes of ruary 1913. the recesses, means for detachably connecting said resistors to said body portion, and con- ISIDOR DEUTSCH' tact members electrically connected to said Witnesses:

resistor. E. L. ZUoK,

In testimony whereof, I have hereunto B. B. HINES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

Images