Tallinn University of Technology
Department
of Electrical Engineering
Report on laboratory work 1 on General Course of Electrical Drive
SENSORLESS DRIVE POWER FLEX (ALLEN BRADLEY )
Jüri
Lina
666BMW
Group
M16 Variant 2
Tallinn
2014
1. Functional Diagram
2.
Tables of observations
Task
Operation / Record
Observation
1
Reverse the motor speed . How long does the motor reverse?
Time to reverse was 16 seconds
2
2: Set the screen display an Output Voltage of the inverter . Turning the potentiometer, find accessible minimal and maximal voltages. Stop the drive.
Minimal: 2.8V
Maximal: 166V
3
3 Turn the keypad potentiometer half -way counter -clockwise. Run the drive and reverse it, count the shaft reversing time. Compare with the previous result and explain the difference . Stop the drive.
Reverse time was 7 seconds.
It was less because the motor was running at a lower speed compared to the previous experiment .
4
Set the Stop Mod to coasting (so called freewheel braking). Enable the Flying Start running function . Run the motor to the maximal speed. Then stop and restart it immediately before the motor stops. Observe the motor response. Stop the drive. Disable Flying Start.
The motor restart is very fast and it accelerates at exponential rate .
5
Set the PWM Frequency to the maximal level and run the motor again. Observe and explain the noise. Is it higher or less than before.
Less noise than before.
PWM noise is caused by the voltage inverter switching at a frequency in the audible range.
6
Using Boost Selection , set the variable torque boost to 30.0 VT. Run the motor at very low speed (2-3 Hz). Suspend warily the motor shaft with fingers. Observe the spring effect ( strong or weak ?). Stop the motor.
The spring effect was weak.
4. Solutions of the problems
1.1 What
dictates the maximal voltage of the drive? Why is it limited?
Maximal voltage
voltage is determined by the drive manufacturer and is usually dictated by the motors ability to dissipate excess thermal energy
that comes from the internal resistance of windings.
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