| 摘要 |
<p>1,237,827. Control of D.C. motors. LICENTIA PATENT VERWALTUNGS G.m.b.H. 23 Oct., 1969 [23 Oct., 1968], No. 52091/69. Heading H2J. [Also in Division G3] A motor 6 is supplied from two bridge rectifiers 4, 5, each of which is connected to a separate secondary winding of a single-phase transformer, and which are controlled in succession to be current conducting according to the required motor voltage, a single regulator 10 controlling both bridges. The output voltage of the regulator is combined with sawtooth voltages derived from generators 11, 12 and then applied to firing-pulse stages 16-19 associated with the bridges 4, 5. The generators 11, 12, whose output voltages are mutually displaced by 180 degrees are connected to a unit 13 for synchronization with the mains. The generators 11, 12 are connected directly to the pulse stages 18, 19 and through Zener diodes 14, 15 to the stages 16, 17. The regulator 10 receives signals representing respectively the desired and actual values of the motor current.</p> |
