GB153582A - Improvements in electrical speed regulator systems - Google Patents

Abstract

153,582. Metropolitan-Viewers Electrical Co., (Assignees of Staege, S. A.). Nov. 6, 1919, [Convention date]. Systems for continuous-current motors only; systems depending on use of two or more motors; motor running synchronously with source of constant frequency.-A constant speed ratio is maintained between two or more electric motors by providing each motor with a controller, the operation of which is dependent upon the frequency of an alternating current, which frequency is dependent upon the speed of the motor and of a clock mechanism, and upon a standard-frequency alternating current. The speed of the motors may be varied, without altering the ratio, by varying the excitation of the generator supplying them, and the standard frequency may be varied by varying the speed of the machine supplying it. A motor 5 drives a paper roll 1 and the armature 21 of an alternating generator 20. The armature 21 is connected to the primary winding 26 of a frequencychanger 24, the secondary winding 25 of which is driven by a clock mechanism 27 and is connected to the primary winding 45 of a motor 44. The secondary winding 46 of the motor 44 is connected to the winding 39 of a frequency-changer 36, the primary winding 37 of which is connected to alternating current mains 38. The winding 39 is driven by a clock mechanism 27 and is connected frequency. Under normal conditions, the frequencies of the currents supplied to the windings 45, 46 of the motor 44 are equal and the rotor is at rest. Upon a variation of speed of the roll 1, the frequency of the current supplied to the winding 45 is varied and the motor 44 operates to move, through a friction clutch, the contact-arm 47 of a relay 47<1>. According to the direction of variation of the speed of the roll 1, the contact 49 engages contacts 52 or 53 to control the direction of rotation of a reversible motor 54 which operates a rheostat 11 in the field circuit of the motor 5. To prevent hunting of the rheostat 11 and sticking of the contacts 49 upon the contacts 52 and 53, the arm 47 is provided with an additional contact 48 adapted to engage contacts 50, 51. When contact 49 engages contact 53, the contact 48 engages contact 51 to energize a magnet 61, through a delay inductance 68, from a 'battery 67. The armature 63 of magnet 61 is provided with a projection 64 through a slot in which the arm 47 passes. When the magnet 61 is energized, the armature 63 is attracted against a biassing spring 66 to disengage contacts 49, 53 and contacts 48, 51. The motor 44 again operates the arm 47 to cause the engagement of contacts 49, 53 if the motor 5 is still not running at its correct speed. A magnet 62, operating in a similar manner to the magnet 61, is employed to disengage contacts 49, 52. The speed of a motor 6 during a roll 2 is controlled similarly by means of a motor 70 and a rheostat which is not shown.