What is ac and dc drive.
Answer / thowsif_csm team_emerson
DC Drives:-
Commonly a DC drive is a device that uses AC as
poer source to power and control a DC motor. The cheap
definition... The drive has two parts the power components
and a controler. The power components convert AC power to
DC by a Rectifier. The controller (among other things) is
basicly a high speed timer that fires a solid state device
(BPT, IGBT or some other gate) very rapidly (Pulse width
modulation on and off). The controller gets a setpoint from
a potentiometer or some other means perhaps a digital
number via some protocol and uses a means of maintaing this
setpoint by calculating the difference between the setpoint
and the actual speed with a tach or some other means and
adjust the output accordingly.
AC Drive:-
AC drives are also known as adjustable-
frequency drives (AFD), variable-speed drives (VSD),
Variable-frequency drives, microdrives or inverter drives.
Since the voltage is varied along with frequency, these are
sometimes also called VVVF (variable voltage variable
frequency) drives.
A AC drive is a system for controlling the rotational speed
of an alternating current (AC) electric motor by
controlling the frequency of the electrical power supplied
to the motor A variable frequency drive is a specific type
of adjustable-speed drive.
Is This Answer Correct ? | 7 Yes | 0 No |
The speed of a dc motor can be controlled by the variation of 1. armature voltage. 2. field current. 3. armature circuit resistance. 4. angle of brush shift. Which of the statements given above are correct? (a) 1,2 and 3 (b) 2,3 and 4 (c) 1,3 and 4 (d) 1,2 and 4
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