Torque is directly proportional to armature current in the
dc motor. By using an inner-current control loop, the dc drive
can directly control torque. Likewise, the constant magneticfield
orientation, which is achieved mechanically through
commutator action, makes direct flux control a given. Thus,
two primary factors toward insuring responsive control (i.e.,
direct torque control and direct flux control) are both present
in the dc drive. The relatively simple electronics required to
implement the dc drive represents another advantage. On the
negative side, both the initial and maintenance costs of dc
motors are high, and high performance speed accuracy can
only be achieved if an encoder is included for feedback.
armatur
directly
proportional
orientation
Torque is directly proportional to armature current in thedc motor. By using an inner-current control loop, the dc drivecan directly control torque. Likewise, the constant magneticfieldorientation, which is achieved mechanically throughcommutator action, makes direct flux control a given. Thus,two primary factors toward insuring responsive control (i.e.,direct torque control and direct flux control) are both presentin the dc drive. The relatively simple electronics required toimplement the dc drive represents another advantage. On thenegative side, both the initial and maintenance costs of dcmotors are high, and high performance speed accuracy canonly be achieved if an encoder is included for feedback.armaturdirectly proportionalorientation
การแปล กรุณารอสักครู่..
