Abstract
Two different configurations for controlling the speed of armature-fed dc drives are compared in this paper. At the first concept a subordinate current control is used to compensate the first-order factor of the armature circuit and to limit the armature current. At the other concept the speed controller directly leads the power amplifier and the armature and the machine. These drives generally have a current controller. too. which normally is not in action but relieves the speed controller when the current is exceeding its limit. By comparisons in the frequency domain it is shown that the relation between the equivalent time constant of the subordinate current control and the time constant of the armature circuit is a criteria that demonstrates which of the compared control concepts yields a faster transient response with fixed amplifier and motor. Some possibilities of current limitation for direct speed-control are presented that join with simple and inexpensive current measuring devices.
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