Complete the code to identify the main component that controls the speed of a DC motor.
The speed of a DC motor is mainly controlled by the [1].The speed of a DC motor is controlled by adjusting the armature voltage, which changes the motor's speed.
Complete the code to name the type of DC motor drive that uses a variable voltage source.
A DC motor drive that controls speed by varying the voltage is called a [1] drive.Variable voltage drives adjust the voltage supplied to the motor to control its speed.
Fix the error in the statement about the torque-speed characteristic of a DC motor.
The torque of a DC motor is directly proportional to the [1] current.The torque in a DC motor is proportional to the armature current, not the field current.
Fill both blanks to complete the description of the motor speed control method.
Speed control can be achieved by varying the [1] or adjusting the [2] current.
Speed control methods include varying the armature voltage or adjusting the field current.
Fill all three blanks to complete the description of speed control regions in DC motor drives.
[1] base speed: varying [2] voltage. [3] base speed: field weakening.
Below base speed: armature voltage control (constant torque region). Above base speed: field weakening (constant power region).