US1466902A - Motor controller - Google Patents

Description

Sept. 4, 1923. 1,466,902

A. J. HORTON MOTOR CONTROLLER Filed Oct. 1 1920 INVENTOR Abbe/Ll HoflIo n ATTORNEY Patented Sept. 1923.

- UNITED STATES PATENT orluclz.

ALBERT J. HORTON, OF WHITE PLAINS, NEW YORK, ASSIGNOR TO THE CUTLER- WEB IIG. 00., F MILWAUKEE, WISCONSIN, A. CORPORATION OF WISCONSIN.

' moron CONTROLLER.

Application filed October 15, 1920. Serial No. 417,102.

To all whom it may concern:

Be it known that I, ALBERT J. HORTON, a citizen of the United States, residing at White Plains in the county of \Vestchester 6 and State of'llew 'York, have invented new and useful Improvements in Motor Controllers, of which the following is a full, clear, concise, and exact description, reference being had to the accompan ing drawing, forming a part of this speciiibation.

This invention relates to motor controllers.

' Heretofore it has been proposed to employ for motor starting and speed regula- The present invention has among its ob-. g'ects to prov de a controller of the aforesaid character wherein this diiiiculty is overcome.

@ther objects and advantages of the in vention will hereinafter appear,

The accompanying drawing diagrammatisally illustrates one embodiment of the invention which will now be described, it being understood that the invention is susceptible or various modifications without departing from the scope of the. appended claims.

Referring to the drawing, the same illustrates a controller afiording both armature and field regulation of a shunt motor 1. This motor is shown as comprisin an armature a and a shunt field winding The controller comprises a rheostat 2 hav ing an armature resistance '1' and a field resistance '1'", a counter-voltage switch 3 for controlling said armature resistance and a rela 4'for controlling said field resistance.

T e rheostat comprises a pivoted arm 5, a series of contact buttons 6 connected th the motor armature for starting:

resistance r and arranged to be progressively engaged by one end of said arm, segments 7 and 8 to be engaged by the same end or said arm, a series of contacts 9 connected to the field resistance r and arranged to be engaged by theopposite end of arm 5 and segments 10, 11 and 12 arranged to be 'engaged by the latter end of said arm. ,The arm 5 has a lme connection extending to the hub thereof; and the portion of said arm engageable with the contact buttons 6 and segments 7 and 8 is insulated from the remainder of said arm.

The arrangement of contact and segments and the circuit connections are such that when the arm 5 is in the position illustrated a circuit extends from line L through the winding of relay 4 by conductor 13 to and through arm 5 to segment 11 by conductoi' 1a to the resistancegr at an intermediate;

point and thence through a portion of said resistance by conductor 15 to and through the motor armature by conductor 16 to .line L. Thus provision is made for inclusion of two steps of resistance in series with the Moreover, the arrangement is such that with the arm 5 in engagement with either the uppermost contact 6 or the segment 7 the same amount of resistance 9" would be included in the armature circuit but subject to exclusion as a whole or in part upon response of the switch 3 which completes circuit from line L through a portion of the winding of relay 4 by conductor 17 to segment 8 and thence to conductor 15 either directly or through one step of resistance r according to the setting of the arm 5.

On "us other hand the arrangement is such that the arm 5 may be moved counter clockwise to include either one or two additional steps of resistance 1- for restriction of the running speed of the motor under light load conditions circuit then being traceable from arm 5 to segment 12 by conductor 18 to segment 8 and thence through the insulated section of the arm 5 to'one or the other of the lowermost resistance contacts 6 .for normal inclusion of the additional resistance. Under such conditions response of the countervoltage switch merely parallels the circuit to segment 8 thus being without effect upon the amount of resistance included in the motor circuit. Should the additional resistance prevent starting of the motor, it is merely necessary to temporarily return the arm 5 to the position illustrated whereupon the starting resistance is reduced to two steps.

In all of the above-described positions of the arm 5 said arm engages segment 10 whereby the field circuit is completed exelusive of all of the resistance 1 This circuit may be traced from the arm 5 to segcuit and throughout the starting period.

When, however, the counter-voltage switch 3 responds, it shortcircuits one section oi the Winding of switch l whereby said switch is permitted to open to include the selected amount of field resistance when the armature current is reduced to a given value.

Thus the controller provides for inclusion of at least given amount of armature resistance and inclusion of all field resistance for starting While providing for reduction of the armature resistance and inclusion of the field resistance automatically upon proper acceleration oi the motor and moreover provides for increasing the amount or armature resistance for speed reduction without interference with the automatic op oration.

As above set forth, if the motor fails to start with the additional armature resistance included in circuit the arm may be temporarily placed in the position illustrated and thereafter moved to include the desired additional resistance.

. What I claim as new and desire to secure by Letters Patent is: Y

1. In a motor controller, in combination, a starting resistance for the motor circuit means operable automatically for excluding said resistance, means to be set to maintain in circuit a variable amount of said resistance and an additional resistance to be also in illuded by said last-mentioned means at W1 2. In a motor controller, in combination, an automatically responsive instrumentality and a rheostat having resistance for the motor circuit. to be excluded by said instrumentalit'y, such resistance being included in the motor circuit for starting regardless of the setting of said rheostat and being subject to exclusion by said instrumentality in memos:

varying amounts according to the setting of said rheostat, said rheostat having additional resistance to be included in circuit with the motor at will.

3. In a motor controller, in combination, an armature rheostat, a switch responsive automatically to shunt a part of the resistance of said rheostat, and circuit connections insuring inclusion in the motor circuit of at least a given amount of the resistance of said rheostat prior to response of said switch and providing for inclusion in the motor circuit of additional resistance of said rheostat at will.

4. In a motor controller, in combination, a. rheostat, an associated switch having means for operating the same automatically subject to a delay, circuit connections insuring inclusion in the motor circuit of at least a given amount of the resistance of said rheostat to be excluded by said switch in varying amounts according to the setting of said rheostat and circuit connections for including in the motor circuit additional resistanc of said rheostet according to adjustment of the latter.

- 5. In combination an electric motor, a rheostat connected to said motor for inclusion in circuit with the latter of a given amount oi the resistance of said rheosat regardless oi the setting of the latter, said rhecstat having additional resistance for in clusion in the motor circuit at will and a switch having means to operate the some automatically hut ect to a delay to exclude to varying degrees the first-mentioned portion of said resistance according to the adjustnient of said rheostat.

a motor controller, in combination, an automatically responsive instrumentality, a rhecstat having resistance to be included in the motor circuit subject to control by said instrumentality, said rheostat having-contacts to vary the amount of resistance thereof included in the motor circuit, certain of such contacts being dependent upon response of said instrumentality for connection thereof in circuit, said rheostat also having other contacts engaged and disengaged according tothe setting of the former contacts, the latter contacts controlling a circuit providing for inclusion of at least a given amount of resistance in the motor circuit prior to responseof said means and connections whereby disengagement of said lattercontacts permits setting of the former contacts to include in the motor circuit a, greater amount of said resistance.

7. In a motor controller, in combination, an automatically responsive instrumentality, 12 and a rheostat having line and motor connections, certain of which are controlled by said instrumentality, said rheostat comprising resistance contacts, a contact, arm having insulated sections one of which co-operates with said contacts to include a variaof by said instrumentality in varying;-- ble amount of the rheostat resistance in the amounts according to the setting of said motor circuit and a contact engaged by the arm and for enabling inclusion of additional 10 other section of said arm to make and break resistance at will by adjustment of said arm.

5 a connection to the resistance at an interme- In witness whereof, I have hereunto subdiate point for insuring inclusion of at least scribed my name, a given resistance subject to exclusion there- ALBERT J. HORTON.

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