Patent GB-191114175-A (GB)
Title: Improvements in Electrical Servo- and Telemotors, and their Modes of Application.
Inventor: ROTTENBURG LOUIS
IPC: G05D3/12
Filed: 1911-06-15
Granted: 1912-06-17
Abstract: 14,175. Rottenburg, L. June 15. No Patent granted (Sealing fee not paid). Naval mountings.-Relates to electric servomotor arrangements for the operation of guns. According to the invention, the rotor winding of a polyphase servomotor is connected direct to an alternating-current supply, while its stator winding is connected to the same source through a controlling commutator, the rotatable brushes of which are connected to the source through slip-rings. When a large servomotor is employed, it is controlled at a distance by means of a similarly constructed telemotor. In the arrangement shown in Fig. 1, a telemotor TM is connected to a shaft carrying the brushes 1<11>, 2<11>, 3<11> of the commutator switch SC of a servomotor SM, the rotor of which is geared to the apparatus to be operated. The stator winding of the servomotor SM is tapped at a number of points A, A1, A2, etc.; B, B<1>, B<2>, etc.; C C<1>, C<2>, etc.; these points being connected to corresponding segments A<1>, A<1>1, A<1>2, etc.; B<1>, B<1>1, B<1>2, etc.; C<1>, C<1>1, C<1>2, &c. of the commutating-switch SC and these segments being in turn connected to alternating-current mains 1 2, 3 through the brushes 1<11>, 2<11>, 3<11> and slip-rings 1<1>, 2<1>, 3<1> as the brushes rotate, thereby producing a rotating field. The rotor winding of the servomotor SM is connected to the mains 1, 2, 3 through slip-rings a, b, c. The rotor of the telemotor TM is connected to the mains 1, 2, 3 through the slip-rings 1<1>, 2<1>, 3<1>, while a rotating field is produced in its stator winding by means of contact-rings R1, R2, R3 and rotating brushes a<1>, b<1>, c<1>; a<11>, b<11>, c<11>; a<111>, b<111>, c<111>, which are rotated by a handle H<1>. Any multiple - phase current may be employed; and for slow movements a threephase current derived from a direct-current source by means of a commutator arrangement may be employed. Normally, the rotor of the servomotor SM revolves in synchronism with the brushes of the commutator switch SC, and slip due to excessive load may be prevented by placing a friction clutch F between the handle H2 and the operating-shaft of commutator switch TC of the telemotor TM, Fig. 2, which shows the application of the arrangement to the operation of guns. The clutch F is arranged to slip before the servomotor SM. Too rapid operation of the commutator switch TC may also be avoided by providing a return ' or a ' check ' control, consisting of a control telescope T2 operated by the motion of the gun, the gun being controlled by a telescope T1. When the telescope T1 and hand-wheel H2 are employed, they may be placed in the conning- tower or gun-turret, and, if the hand-wheel is near the gun, the telemotor TM and its switch TC may be dispensed with, the hand-wheel H2 being connected to the switch SC of the servomotor SM and the telescope T1. In the arrangement shown in Fig. 3, the gun is automatically kept at a fixed elevation by means of a gyroscope Wand rack Q driving the switch TC, the telemotor TM of which operates one element of a differential gear D, a second element being operated by the hand-wheel H3, and the combined movements transmitted to the switch SC of the servomotor SM by means of gearing S<1>, S<2>. If desired, a second set may be employed to train the gun or turret.