US428169A

US428169A - Walter ii

Info

Publication number: US428169A
Authority: US
Publication date: 1890-05-20
Anticipated expiration: 1907-05-20

Description

W. H. KNIGHT; ELECTRIC MOTOR REGULATOR.

' (No Model.)

Patented May 20, 1890.

INVENTOR 4%, W

I 7 .//3Ig panying drawings, whereina l IVALTER II. KNIGHT, OF NEW YORK, N. Y.

ELECTRIC-MOTOR REGULATOR.

SPECIFICATION forming part of Letters Patent No. 428,169, dated May 20, 1890.

Original application filed March 13, 1386, Serial No, 195,183. Divided and this application filed June 5,1889. Serial No,3l3,229-

(N0 model.)

To aZZ whom it may concern.-

Be it known that I, IVALTER II. KNIGHT, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Electric-Motor Regu- I lators, of which the following is a specitica- I Figure 1 is a diagrammatical view of a reversing mechanism and a regulating mechanism for an electric motor so connected as to embody my invention. Figs. 2 and 3 show the alternative condition to that shown in Fig. 1, wherein the reversing mechanism. is set in opposite directions respectively.

tion. In the drawings, A represents a reversing Myinvention, whichis a dlvision of my apl device for an electric motor, which in this '10 plication, Serial No. 195,133, filed March 13, case is shown as a lever for shifting the posic tion of the brushes upon the commutator. The same result, however, may be accomplished by any other of the \'ell-known means for that purpose. B is a regulator for the motor, consisting in this case of a lever controlling the resistance, cutting out more or less of it at the will of the operator.

Any other controlling device by which a variation between the direct and counter electro-motive forces is prevented from causing an injurious flow of current to the motor may be employed.

0 is the resistancedever, provided with a grooved segment D.

1886, relates to controlling devices for elcetri motors. 1

It is especially adapted for motors working on a circuit of constant potential, such as is employed for electric railways. In motors of a circuit of this character it is essential that a resistance or other device for opposing the clectro motive force should be inserted in the circuit whenever the motor is at rest or its counter electro-motive force substantially diminished. Since a reversal of the motor, of course, reverses its counter electro-motive force, it is essential that it should only be reversed when the motor is at rest, and when there is substantially no current passing E is a eonnecting-rod from. the lever A, through it. A sudden reversal of the motor leading to a pivoted triangular block F, provided with pins G, which pins in Fig. 1 extend into a break in the lower flange of segment D and prevent any movement of lever O. In this condition the lever A is holding the commutator-brush at a neutral point, so that no lead is given to the motor and the resistanceleve'r cannot be turned to throw out the re sistance and admit current to the motor when it is not in a condition to generate its counter electro-m otive force. \Vhen, however, thelever A is turned to one side or the other to give a direction to the motor, the block F is thrown into one or the other of the positions shown in Figs. 2 and The pins G are then. thrown out of the path of the flange of D, so that it may readily pass between them in either direction, whether the position. taken be that of Fig. 2 or Fig. 3. The resistance can then be cut out and the motor operated and regulated at will; but when any of the resistance is cutout by a movement of lever C in either direction from the position of Fig. 1 the flange of D comes in between the two pins G and prevents any movement of block F, thereby locking the lever A in position. By

when in operation so affects the counter eleetro-motive force that unless a resistance. is inserted the sudden flow of current which ensues is so great as to burn out the machine. Moreover, when the reversing device is a switch controlling the direction of current in either the field magnet or armature, it is apt to be injured by operating it. while the our rent is passing.

My invention consists in providing a re versing mechanism for the motor with a stop or look, so that it can be operated only when there is a sullicient amount of resistance insorted to prevent injur and it, furthermore, consists in providing a stop or look for the resistance controller or regulator of the machine, by which, when the reversing mechanism is at the neutral point, the resistance cannot be out out. These devices absolutely prevent reversal of the motor at an improper time, and also the operation of the regulator unless the reversing mechanism is set in one direction or the other.

My invention is illustrated in the accomthis arrangement the leverAcannot be turned 1 of a regulator therefor, a stop or look for the to reverse the motor until the lever (T is regulator, and a reversing device for the mobrought back to the position of Fig. l with tor connected to said step, whereby the said the maximum resistance in circuit. stop is operated by the reversing device to 5 By the device above described itwill be lock the regulator against movement, except 3( seen that the motor is at all times safe from when the reversing device is in a predeteraecident at the hands of reckless and inex mined posit-i011. perienced operators. 4:. The combination, with an electric motor \Vhat I claim as new, and desire to secure on a constant-potential circuit, of a regulator 10 by Letters Patent, isand reversing device therefor, operated inde- 35 1. The combinatiomwith an electric motor, pendently of one another, and an intermediof a reversing device and regulator therefor, ate stop or lock connection, whereby the regumeans for operating the same, and a stop for later and reversing device each controls the the reversing device, controlled by the regumovement of the other.

I 5 later, whereby the reversing device can be 5. The combination,with an electric motor 40 operated only when the regulator is in a preon a constant-potential circuit, of a reversingdetermined position. lever therefor,aregulating-lever,atlangedseg- *2. The combination, with an electric motor, ment on the regulator-lever, a pivoted block of a reversing device therefor, a regulator, having stops engaging with the ilange of the 20 a stop for the reversing device, controlled by segment, and a connection therefrom to the 5 the regulator and locking the reversing dereversing-lever, substantially as described. vice, so as to prevent its being operated QX- \VA'L'iER ll. KNIGHT. cept when the regulator is substantially at the point of maximum control.

25 3. The combinatiomwith an electric motor,

Attest:

(I. H. SWAN, R. W. 1-;LAcKwELL.