Cinematographic annual : 1930 (1930)

Record Details:

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REPRODUCTION IN THE THEATRE 397 relatively large change of plate current. This current flowing thru resistance R causes a correspondingly large change in the grid potentials of V and V . Thus it is that a change of speed will either increase or decrease the current supply from V1 and r JOKBttf f ROTOR 5TATOR MOTOR Z Fuses GRD LINE SWITCH BRlDGt CIRCUIT i D fc>: c, Rj Rt .MQ»09fl.a •jo m 3 Ef /\ AX.C0NTRO4. CABINET FIGURE 12 V 2 . This current flows thru a winding which is on the same iron core as Lt . With increasing current from these two tubes, the magnetic flux in the iron core will increase to saturation and the impedance of L , decreases. The torque of the driving motor varies inversely with the impedance of the rotor circuit and hence with the impedance of L 1 . Therefore, with an increase of current from V j and V 2 the reactance of L j decreases and the motor will speed up. Likewise a shift of phase of 180° will cause a lesser current from Vj and V2 and cause the reactance of L x to increase and the motor to slow up. To keep the motor speed more constant an additional network of R2 , R3 , R4 and C2 is added in such a manner that a change of potential across R2 feeds back to the grid of V and thereby gives the circuit additional regulation.