The DC drive technology is the oldest form of electrical speed control. The drive system consists
of a DC motor and a controller. The motor is constructed with armature and field windings. Both of these windings require a DC excitation for motor operation. Usually the field winding is excited with a constant level voltage from the controller.
of a DC motor and a controller. The motor is constructed with armature and field windings. Both of these windings require a DC excitation for motor operation. Usually the field winding is excited with a constant level voltage from the controller.
Then, applying a DC voltage from the controller to the armature of the motor will operate the
motor. The armature connections are made through a brush and commutator assembly. The speed of the motor is directly proportional to the applied voltage.
The controller is a phase controlled bridge rectifier with logic circuits to control the DC voltage delivered to the motor armature. Speed control is achieved by regulating the armature voltage to the motor. Often a tachogenerator is included to achieve good speed regulation. The tacho would be mounted on the motor and produces a speed feedback signal that is used within the controller.
motor. The armature connections are made through a brush and commutator assembly. The speed of the motor is directly proportional to the applied voltage.
The controller is a phase controlled bridge rectifier with logic circuits to control the DC voltage delivered to the motor armature. Speed control is achieved by regulating the armature voltage to the motor. Often a tachogenerator is included to achieve good speed regulation. The tacho would be mounted on the motor and produces a speed feedback signal that is used within the controller.
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