초록 ▼

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

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.

대표청구항 ▼

A control system for automatically controlling the coefficient of excitation in a DC machine having an armature winding and a field winding, said DC machine typically being operated under conditions wherein the demand varies from time to time, said control system operating independently of armature

A control system for automatically controlling the coefficient of excitation in a DC machine having an armature winding and a field winding, said DC machine typically being operated under conditions wherein the demand varies from time to time, said control system operating independently of armature r.p.m. and armature voltage, said system comprising: generator means for generating a pulse signal having a predetermined frequency and pulse width; demand signal means for producing an electrical demand signal corresponding to the demand on said DC machine; armature current sensing means coupled to said armature winding for producing an electrical drive signal corresponding to the actual armature current in said DC machine independently of armature r.p.m. and armature voltage; pulse width sensing means coupled to said generator means for sensing the pulse width of said pulse signal and developing a corresponding pulse width signal; pull up circuit means coupled to said pulse width sensing means and responsive to said pulse width signal for generating a deactivating signal; control circuit means coupled to said generator means and to said pull-up circuit means and responsive to said demand signal, said deactivating signal and said drive signal for adjusting said pulse width of said pulse signal; and means, coupled between said control circuit means and said armature winding and said field winding, and responsive to said pulse signal, for applying signals to said armature winding and said field winding which vary in accordance with said adjusted pulse width throughout the entire operating range of said DC machine, 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.