Improvements relating to balancing machines

摘要: 726,107. Balancing machines. SMALL ELECTRIC MOTORS, Ltd. March 25, 1953, No. 8297/53. Class 40 (1) In a balancing machine in which the rotor is mounted bearings provided with electrical tranducers outputs of are combined and operate, via frequency-selective network, indicators magnitude angular position necessary correcting masses two planes, tuning network automatically maintained correspondence frequency transducer signals if speed varies. This avoids errors would otherwise arise from variations phase signal respect to unbalance. system described, indicated stroboscopically, each pulse, resulting combination signals, flashing lamp illuminate scale on rotor. Circuit arrangements. The transducers after amplification tuned amplifiers 8, 14 passes circuit 26 for stroboscopic full wave rectifier 24 supplies an indicator 25 extent With aid tapping cathode capacitor 29, double passed control path comprising amplifier 30, clipper 33 discriminator stage 34, whose resonant at somewhat above twice normal rotation frequecy, so that it operates substantially linear flank its response curve giving across secondary 37 voltage proportional frequency. meter 38, part rectified output applied as bias, through smoothing inductance 40, first valve 8 compensate loss dynamic impedance falls reactor valves 13, 19, 20 adjust tuned. action modified by bias dependent strength between grid 30 fed 43, 42, neutralize any strength-dependent component passing 33, 34. supplied stroboscope triggering thereby constant box output.