Army Transportation and Aviation Logistics Discussion

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Assignment 2: - Scenario: - Select a DC and AC motor and compare the key features with the new range of DC and AC motors. Assessment Method: - A written Report Assignment 3: - Scenario: - As a technician, you are asked to explain the operation of a START/STOP/Retain relay control circuit to a new trainee. Assessment Method: - A written Report Marking Criteria for Task: - Category Excellent Good Satisfactory Needs Improvement (5 Marks) (4 Marks) (3 Marks) (2 Mark) Presentation Addresses all parts of the Addresses all parts of Addresses the task Addresses the task only task extremely well. task ok. good though some aspects may partially. Presents Excellent confidence, confidence. Delivery is be more covered than relevant main ideas Delivery is fluent. Jok. Presents with others. Presents main though they may be Presents with relevant, relevant, supported ideas clearly, but some unsupported or have extended and supported ideas. supporting ideas may irrelevant support ideas clearly lack detail or focus. Delivery is not good. No Delivery lack fluency, confidence at all. Lacks the confidence. Response for Able to answer correctly Able to answer Listened appropriately to Listened appropriately to Queries and fluently to questions questions related to the questions when asked questions when asked related to the facts, facts, theories and and answered partially and struggled to provide theories and process process presented in answers presented with excellent good manner. coordination Report Addresses all parts of Addresses all parts of Addresses the task Addresses the task only the task extremely task well. Presents a though some aspects may partially. Presents well. Presents a very well-developed be more covered than relevant main ideas well-developed response with relevant, others. Presents main though they may be response with supported ideas. ideas clearly, but some unsupported or have relevant extended supporting ideas may irrelevant support and supported ideas. lack detail or focus
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1
AC AND DC MOTORS

AC and DC Motors
Student’s Name
Institution
Date

2
AC AND DC MOTORS
Assignment Two
Although the AC and DC motors convert electric energy to mechanical energy, they
possess specific differences in certain features. These differences are evident in input power,
magnetic field, speed control, startup mechanism, and performance. Thus, the subsequent
paragraphs will explain the discrepancies in the above features.


Input power; AC motors are operated from the bidirectional power source. Thus, they
can be performed using the single-phase power source or the three-phase power source
(Barinov, & Melnichenko, 2019). Conversely, DC motors are driven by a unidirectional
current supplied from a direct current source.



Magnetic field: the stator coils in the AC motors are supplied with an alternating current,
which produces a rotating magnetic field (Barinov, & Melnichenko, 2019). In DC
motors, a set of field coils or a permanent magnet make a magnetic field devoid of
rotation.



Speed Control: The motors' speed in AC motors is controlled by the input frequency of
the alternating current generated by the stator coils. The speed is directly proportional to
the input frequency (Barinov, & Melnichenko, 2019). Conversely, DC motors' speed is
regulated by the fluctuating current and voltage in the armature coils (Barinov, &
Melnichenko, 2019).



Performance: AC motors are highly preferred due to their high variable torque and high
speed. On the other hand, DC motors are preferred where speed control is needed.

3
AC AND DC MOTORS
Assignment Three
The DC motors operate by converting electrical energy into mechanical energy through
rotation. The physical behavior of electromagnetism influences the high-speed circuit. The
Direct Current motors have inductors which ...


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