Question: An 8-pole trapezoidal BLDCM is driven round at a speed of 1000 rpm and the measured open-circuit line voltage is 20 V. The phase

An 8-pole trapezoidal BLDCM is driven round at a speed of 1000 rpm and the measured open-circuit line voltage

An 8-pole trapezoidal BLDCM is driven round at a speed of 1000 rpm and the measured open-circuit line voltage is 20 V. The phase resistance is 1 Ohm and the rated motor current is 5A. The motor is supplied from an inverter system with a maximum output frequency of 175 Hz and a 40 V DC power supply. Find: the rated torque and rated speed of the drive; the maximum speed that the drive can attain whilst delivering 25% of its (i) (ii) rated torque.

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