A brushless DC motor is fed from a $3-$phase source of $230$Vll through a full$-$wave

controlled rectifier

First, two tests are run for machine characterization:

$1)$ The rectifier delay angle is set at $45,$ no load is connected to the shaft and the speed is

measured to be $3100$rpm$.$

$2)$ The rectifier delay angle is set to $85,$ the rotor is held locked and the current is measured

to be $20$A