Page 343 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

Conveyor Systems
Conveyor systems require constant speed and high torque, which makes DC motors an ideal option. As has been
found with other applications, DC motors have high torque at start up and even consistent speed. Brushless DC
motors are the most commonly used for conveyor applications. They are noiseless and can be easily controlled,
a major requirement for conveying systems.
Ceiling Fans
Ceiling fans made with DC motors have become extremely popular. They use less power and have a rapid start
up torque. The alternating current in a home or office is easily converted to DC power by a transformer, an effect
that decreases the amount of power required by the fan. As with other DC motor applications, brushless DC
motors are most commonly used in ceiling fans.
Pump Drives
DC motors have been the main driving force behind pumps for several decades because of their variable speed
control, simple control system, high starting torque, and good transient response. For many years, pumping
systems depended on brushed DC motors as their primary source of energy. The development of permanent
magnet DC motors and brushless DC motors have offered a more beneficial option for pump system operations.
Elevators
In high speed elevators, AC motors are impractical due to their difficulty decelerating and accurately leveling with
the floor. These problems are overcome with DC motors because they allow for infinite control of their speed
by varying the current supplied to the armature. As with ceiling fans, the operation of a DC motor for elevators
depends on changing the incoming AC current to DC current through the use of a transformer.

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CITS : E & H - Electronics Mechanic - Lesson 205 - 222