US965676A - Motor-controller. - Google Patents

Description

G. H. WHITTINGHAM.

MOTOR CONTROLLER.

APPLICATION FILED 3.18, 1910.

965,676. Patented July 26,1910.

i To all whom it may concern:

uurrnnsrntrns PATENT- orrio GEORGE I-I. WHITTINGHAM, OF BEL'.[1V[OR E,-MRYLAND, ASSIG-NOR TO MONITOR MANUFACTURING COMPANY OF BALTIMOM QITY}ZPFGQEPORATION OF MARYLAND.

Moron-CONTROLLER.

Specification of Letters resent.

Patented July 2c, 1910,

' Application meae in 18, 1910. Serial No. 556,156.

Hanna citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvem'ents in Motor-Controllers, of which the following is a'specification. j

This invention relates to improvements in the class of apparatus illustrated and described in Patent No. 891,720 granted to lVilliam'C. OBrien, June 23,1908.

In operating machines, such ,as printing presses, by-directly connected motors, it is desirable to provide means for operating the motor at different speeds for different classes of work, and to'always operate the motor and press ,at a'uniform speed while any given ob or "piece'of' work is being printed, regardless of the number of times the motor may be stopped orstarted while that particular job is running through the p'ress, .in order that the printed matter may be uniform in appearance. Where the motor nnst be operated at a speed considerably below the normal, by maintaining a resistance in the armature circuit, a manus ally controlled regulator arm is provided which is set at a sistance which will give the desired speed;

the regulating resistance from the armature circuit while the motor is and whlch then eliminates slstance, leaving in circuit'tlie starting its load desired quantity of regulating resistance.

In the accompanying drawing the invention is illustrated in connection with a starter controlled by the current flowing in the armature circuit, the starter bein shown partly section and partly in si e vi w, LI1il1tli8lTCuitS being shown diagra .1 metme y.

Referring to the drawing, A indicates a panel. holding solenoid b and a regulating solenoid of the motor oint on the regulating re the starting resuitable supporting panel and B'indicatcs Be it 'known that I, G ORGE H. VVHITTING the "starter-or controlling device, upon the The'controlling device comprises a b,'hav1ng windings 1 and 2,respectively. In the 'drawingthese coils are shown connected in series with one another and in series with a starting resistance R and a regulating resistance R and the armature a M. The coil 1 of'the solenoid B is connected by a wire 3t'o one side of a supply switch S and one brush or the motor is connected by a wire 4 to the other side of said supply switch so that a complete circuit is formed from one side of said switch to the .other through the starter, resistances, and

motorarmature. The switch S is arranged to make and break connection with the terminals 5 and 6 connected with the supply WiresL, L; A lever 7 pivoted to the frame 8"of the starter has a slot and'pin connection with the core-9 of the regulating solenoidso that said core and lever will move together, while the core 10 of the holding solenoid normally rests upon the opposite so arm of the lever and supports the core 9 of the regulating solenoid. A switch arm 11 connected to the lever Tnormally engages a switch terminal 12 and when moved from normal position, said switch'arm engages a .85 terminal 13. The switch arm is connected by conductors 14 and It? to a point 16in the armature circuit between the starting and regulating resistances and the switch member 12 is connected by a conductor 17 to a point 18 in the armature circuit be-- tween the regulating resistance-and the armature. The conductor 17 includes the coils of'a blow-out magnet 19' arranged adjacent to the contact point-ofthe switoh members 11 and 12, It will be seen that in the normal position of the switch arm the regulating resistance 'is entirely slfiunted through the conductors '15, 14: and 1 7. The contact member 13 is connected by acon ductor 2 0 to'the wire 21 which-connects'the coils of the holding and regulating solenoids, and when-the switch arm 11 engages the contact 13, the shunt around the regu lating resistance will be broken and a shunt circuit will be formed around the regulating solenoid and the starting resistance R, this latter shunt circuit extending from the wire 21, through wire 20 to contact 13, thence through switch arm 11 and conductors 14 and 15 to the right hand end of the starting resistance R. A manually controlled regulatorfarm 22 engages'the contacts of the regulating resistance R and this artn is connected by wire 23 to the wires 14: and 15. The shunt field 24 of the motor is shown connected to the wires 3 and 4 by con-- ductor 25.

The operation is as follows: The regulating resistance is normally short circuited,

while the st-artin resistance is in series with the armature. Y

' as this current remains above a predeteriswitch arm 11 mined quantity. As long as the core of the regulating solenoid is sustained by the current, the regulating resistance remains shunted and the starting resistance remains in circuit; but as soon as the starting current falls to a safe predetermined limit, the regulating solenoid releases its core and the is thereby moved into engagement with the contact 13 thereby closing the shunt circuit around the starting resistance and the coils of the regulating solenoid, and also, prior thereto, opening the shunt circuit around the regulating resistance. \Vhen the switch arm engages the contact 13 current then flows through the wires 14 and 23 v to the regulator arm 22, and through so' much of the regulating resistance as is mehided between said arm and the point 18. It will, therefore, be plain that if the arm 29. is set to run the motor at a certain speed, the arrangement of the starter'and circuits is such that, for starting purposes, the en v tire regulating resistance will be eliminated from the armature circuit until the motor has gained sufficient speed to cause the re lease of the core of the regulating solenoid, and that after this occurrence the starting resistance will be cut out and the motor will run with the amount of regulating resist; ance in circuit which set to include.

What I claim is- 1. A controlling mechanism for electric motors, comprisingstarting and regulating resistances for the armature circuit, an means for automatically maintaining the starting resistance in circuit and the reguoid having .the regulating resistance and adap the arm 22 had been lating resistance out of circuit while the motor is starting, and for cutting out the starting resistance and including the regulating resistance after the motor has started.

2. A controlling mechanism for electric motors, comprising starting and regulating resistances for the armature circuit, and means controlled by the armature current forautomatically maintaining the starting resistance in circuit andthe regulating resistance out of circuit while the motor is starting, and for cutting out the starting resistance and including. the regulating resistance after the motor has started.

3. A controlling mechanism for electric motors, comprising starting and regulating resistances for the armature circuit, circuits for shuntin said resistances, a switch member adapted to open and close said shunt circuits alternately, and means for automatically operating said member so as to maintain the shunt around the regulating resistance-closed while the motor is starting and to open said latter shunt and close the shunt around the starting resistance after the motor has started.

4. A controlling mechanism for electric motors, comprising starting and regulating resistances in the armature circuit, circuits for shunting said resistances, and an automatically controlled device comprising av switch member normally closing the shunt around the regulating resistance and adapted, when vmoved from normal posi-' tion, to open said latter shuntand close the shunt .around the starting resistance.-

5.' A controlling mechanism .for electric motors, comprising starting and regulating resistances in the armature circuit, circuits for shunting said resistances, a n automatically controlled device comprising a solen- -windings in series with the motor armature and a switchmember controlled by said solenoid,2- said switch member normally-closing the shuntaround ted, when moved from normal position, to open said latter shunt and close the shunt around the starting resistance. I

In testimony whereof I aflix my signature, in presence of two witnesses.

, Rosana WATSON, Nrw'ron P; WILLIS.

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