The motor will operate in a continuous mode in an ambient

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Reference no: EM13477779

1. Describe the key features of dc and ac motors:-

2. Describe the main methods of starting A.C motors

3. Describe the advantages and disadvantages of star delta starting

4. How can the speed and direction of a three phase synchronous motor be controlled

5. Describe the main factors affecting the selection of an electric motor

6. Give an example and explanation of the information on a typical motor nameplate.

7. You have been asked to source a motor ( and starter) capable of powering an escalator; The following information is to be used:-

a) Angle of escalator = 30deg

b) Rise = 8m

c) Each tread = 0.4m

d) Each tread could have 1 person ( assume 75kg per person)

e) The escalator rises from bottom to top in 20 seconds

f) Assume 2kW of load due to friction

g) The motor will operate in a continuous mode in an ambient temperature between 10 and 30 deg C. The maximum temperature increase is 70 deg C

Reference no: EM13477779

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