Exam 47: Solid-State Adjustable Speed Control

DC motors can be operated at a slow speed with a high torque.

A signal electronics module provides the overall drive control.

When operating the motor _______speed, the armature voltage is reduced accordingly.

Because there is no counter emf when the armature is at a standstill, and its resistance is very low, the current taken by the armature on startup will be_____ .

With solid-state drives, sufficient space is allowed around power terminals to ensure working room and easy installation of___________ .

Generally, DC motors are run at base speed or below.

Rectified and controlled direct current is fed to the armature of the motor by __________controlled rectifiers.

When power is applied to the drive, each of the circuit boards is simultaneously checked by the microprocessor.

If it is necessary to operate the motor above base speed, the field voltage is increased and armature voltage is fully applied.

It is not necessary to have a DC power plant and distribution system due to the wide use of solid-state___ .