| 摘要 |
A control system for automatically controlling the coefficient of excitation of a DC machine comprises, in general, generator means for generating a pulse signal having a predetermined frequency and pulse width. Demand signal means are utilized for producing an electrical demand signal corresponding to the demand on the DC machine. Armature current sensing means are coupled to the armature winding for producing an electrical drive signal corresponding to the armature current in the DC machine. Control circuit means are coupled to the generator means and are responsive to the demand signal and the drive signal for adjusting the pulse width of the pulse signal. Means are coupled between the control circuit means and the armature and field winding and are responsive to the pulse signal for applying signals to the armature and field windings which vary in accordance with the adjusted pulse width, whereby the coefficient of field excitation is varied in accordance with the corresponding demand and armature current to substantially increase the efficiency of the DC machine.
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