Electrical engineering motors

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Btec HNC in Construction and the Built Environment

Assignment Front Sheet

Program No. MM 758 Qualification:  Building Services Engineering
Unit Number: 50 Unit Title: Electrical Installation for B.S.E 
Learner Name:   Registration No.
Assignment Title: Understand DC and AC motors  Assignment No: 3 of 4
Hand in dates & times. First Draft: in stages  
Final submission: See Turnitin dates.  

 

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Learner’s signature:   Date:        /       /

 

Assessor’s comment on final submission
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Assignment approved for use in academic year 20010/11

 

Learner feedback on this assignment
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The criteria below are available in this assignment.  Assessor initials in this grid indicate which criteria have been awarded

Criterion LO3.1 LO3.2 LO3.3 LO3.4 LO3.5 M D
Initials              

Assignment writer to edit grid to match criteria covered in this assignment

 

 

Assessor Name: R Pareccini Date  
Internal Verifier:   Date IV’d:  
Date of Issue: 16 /09 / 2014 Submission is: Moodle –   Turnitin

 

Unit No. 50 Unit title Electrical Installation for B.S.E 
Grading Criteria Page No Achieve

(Y/N)

Assessor’s feedback:

Actions you must take to meet assignment criteria

PASS grade criteria                                    
 

LO 3.1

Examine DC series and shunt motor applications
 

 

 

LO 3.2

Explain how to control the speed of DC series motors using thyristor control    
LO 3.3 Calculate the theoretical ratings of motors for a given duty    
LO 3.4 Explain starting methods and speed control for AC motors.    
LO 3.5 Evaluate the suitability of AC motors for building services applications    
DISTINCTION grade criteria                       É   Learner to enter Page Numbers before submission
 

D

Take responsibility for managing and organising activities

 


Assignment Number 3of  4 Assignment title Understand DC and AC motors 
 

As a newly appointed Electrical Engineer for a large Electrical Contractor, you are part of the project team involved in the feasibility and provisional electrical design for a new leisure centre block (see attached drawings).

You have been asked to produce a portfolio of evidence that includes the provision of electrical machines (DC and AC) and associated control equipment.

Assignment criteria: Tasks
 

LO 3.1

 

Examine DC series and shunt motor applications

  Task 13

 

DC motors are ideal for a wide range of applications, including:

Ski lifts – Printing presses- Heavy Moveable Structures – Paper Milling- Cranes – Iron, Steel and glasswork-

  • Your task is to select an adequate DC motor (shunt, series or compound) for the above applications.

You need to include manufacture data for the chosen motor.

 

LO 3.2

 

Explain how to control the speed of DC series motors using thyristor control

 

                                                            Task 14

With the aid of a diagram explain how to control the speed

of a DC series motor using thyristor control.

(You may use the multisim software to construct the circuit).

 

LO 3.3

 

Calculate the theoretical ratings of motors for a given duty

Task 15

A servomotor  for plastic moulding machine

has a repetitive duty cycle as follow:

 

Time (s)           10-15          15-25       25-35          35-50            50-55    55-60

KW Load                1                 2                 1                 3                       1           4

With the aid of a diagram,

depict the duty cycle above

(x axis = time in seconds, and y axis = power in Kw).

Determine the minimum motor rating.

 

LO 3.4

 

Explain starting methods and speed control for AC motors.

Task 16

The selection of a suitable starting method for a motor/load combination is becoming increasingly important.

 

Explain how the different types of motor starters works ( D.O.L – Star / Delta – Rotor resistance – soft start, VFD). Use diagrams to support your answers.

Also explore how you can control the speed of a Three phase A.C. motor using solid state devices.

LO 3.5

Evaluate the suitability of AC motors for building services applications

Task 17

The Building Regulation approved documents F and L have signalled a big shift toward energy-efficiency buildings.  Refer to UK regulations only.

 

Select and justify an appropriate AC motor for the following applications:

 

  • HVAC unit /compressor- condenser fan
  • A below ground pump station for rainwater harvesting.
  • A multi storey high rise water supply pumps.
  • Air curtains on entrance doors to a restaurant or supermarket.

 

 

 

REFERENCE GUIDANCE

 Employer Engagement and Vocational Contexts

Support to enable centres to initiate and establish links to industry and to networks arranging visits to industry and from property practitioners is given below:

Indicative reading for learners

 

Textbooks

  Technical Index – B.S. (from Moodle – On line resources).

 

 BS 7671:2008 (AM1)

 

Electrical circuit theory & technology (John Bird)

 

Building Regulations Approved documents. (Planning portal.gov.uk)

 

Building Services Handbook ( Fred Hall & Roger Greeno)

ABB/Schneider technical books.

 

Journals

Wiring matters- CIBSE Guides.

 

Websites

 

The student is expected to research further using the internet (ensure you quote all references)

 

Important information:

Where there is evidence of plagiarism the assignment will be rejected and the candidate will have to re-submit the work. This will jeopardize your chances of completing the unit.

Work that is not handed in on time will not be graded.

You may hand in completed tasks at different times to those shown, but work must be handed in to gauge the progress being made.

You must hand in the Marking Grid each time you hand in work for assessment.

The assignment will not be assessed unless accompanied by the marking grid.