ANSWER SCHEME 1. Electric drive a) Power source: explains type of source (either regulated or unregulate b) Power processing unit – explains the type of power electronic conver it is used for – 1m c) Motor – explains a typical selection- state factors such as cost, efficie 2m d) Control unit - explains the type of control and sensors used as input to e) Load - explains the torque requirement -1m 2. a) Steady-state requirement: explains the speed + torque needed at rated b) Transient state requirement: explains the speed + torque needed at ac
ANSWER SCHEME 1. Electric drive a) Power source: explains type of source (either regulated or unregulate b) Power processing unit – explains the type of power electronic conver it is used for – 1m c) Motor – explains a typical selection- state factors such as cost, efficie 2m d) Control unit - explains the type of control and sensors used as input to e) Load - explains the torque requirement -1m 2. a) Steady-state requirement: explains the speed + torque needed at rated b) Transient state requirement: explains the speed + torque needed at ac
Chapter22: Sequence Control
Section: Chapter Questions
Problem 1SQ: Describe what is meant by sequence control.
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Transcribed Image Text:ANSWER SCHEME
1. Electric drive
a) Power source: explains type of source (either regulated or unregulated) 1m
b) Power processing unit – explains the type of power electronic converters used and what
it is used for – 1m
c) Motor – explains a typical selection- state factors such as cost, efficiency, environment -
2m
d) Control unit – explains the type of control and sensors used as input to the controller- 1m
e) Load - explains the torque requirement -1m
2. a) Steady-state requirement: explains the speed + torque needed at rated operations -2m
b) Transient state requirement: explains the speed + torque needed at accelerated (starting)
/decelerated (stopping) operation. -4m
3. Approximated model – a mathematical representation of the load torque and transient
torque. Must include the determination of the moment of inertia of the application -5m
4. Motion profile requirement – explains the type of motion profile needed for the whole
operation with diagram -5m
5. Selection with justification (such as rated power, rated speed, pull-out torque with respect to
the load demand) -5m
Transcribed Image Text:Your solution must include:
1. Components of the electric drive (at the minimum you should explain the power source, the
motor, power processing unit, control unit, and the mechanical load i.e. torque requirement).
2. Steady-state and transient operation requirements
3. Approximated model of the motor-load system which should at least presents the equation
of the torque requirement at steady-state and transient state. This must be accompanied by
a supporting diagram. If the application uses a power transmission system, the model must
reflect the use of the power transmission in the equations presented.
4. Motion profile requirement. You should also consider whether the application requires
continuous/ intermittent operation.
5. The possible selection of the motor based on all the requirements in 3,4 and 5. Please
accompany the proposal with a suitable datasheet
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