The rating of DC electric motors https://www.mrosupply.com/v-belts/cogged-v-belts/bx-section/181101_bx32_gates-rubber/ will be according to the way the motor is powered. Let us describe below some forms of excitement:
– shunt or shunt excitation: In it, the field winding circuit that will produce the excitation will be in parallel or shunt with the armature circuit. In this configuration, only one DC source will be needed to power the armature and field circuit because the circuits will be in parallel.
– Compound Excitation: it is the excitation with two windings, one in series and the other one in derivation, being able to have the connection scheme long or short and compound additive or subtractive. In this connection scheme we use a combination of series excitation and shunt, to take advantage of both connections.
– Independent or separate excitation: In this configuration the excitation circuit of the motors is supplied by an additional source independent of or separate from the source of direct current that will supply the armature.
– Series excitation: The field winding circuit producing the excitation is in series with the armature circuit, so only one source will be needed to power the field circuit and the armature, and a proper winding for the excitation circuit .