ENEL3CA - Speed Control of Induction Motor - Engineering Assignment Help

Assignment Task

Project Description:
Teams of 4 students will design a system to monitor and control the speed of a fan. The system will determine the speed depending ambient temperature. The display should show the current temperature and fan speed.

Sub-systems:
The Switched-mode power supply Unit (Analog):
This will supply the required DC power for all sub-systems.
• Input: 20 +/- 4 VDC (i.e. 16v <= input voltage <= 24v DC)
• Output: 5VDC @ 500mA max.
• No more than 10% change in voltage over entire range of input voltage and load conditions. The power supply must be REGULATED, ie. the voltage maintained without human intervention. Ripple output voltage of 10% means 4.5v <= output voltage <= 5.5v DC @ 0.5A or 500mA max.
• Min. 80% efficiency at full load.
• Variable voltage mode: adjust from 0 to 5V.
• Short circuit/overcurrent protection.
• No SMPS “on-a-chip” solutions. Build from first principles.

Motor Driver Unit (Analog):
This unit will handle all high voltage (220/230V AC 50 Hz) and drive the motor.
• High voltage circuitry to trig a 24W 230VAC induction motor into drive mode.
• There must be isolation between the low voltage circuitry and high voltage circuitry of the induction motor.
• The speed of the motor should be determined by the Speed Reference unit.

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