Question

A 12-pole, brushless, DC motor has a no-load speed of 5000rpm and a stall torque of 50 in-oz when operating at rated voltage of 60V. Testing shows that no-load speed and stall torque vary linearly with applied voltage. Also, with a constant applied voltage the speed decreases linearly as delivered torque increases. Calculate the following: Torque that the motor delivers at 2000 rpm when operated at rated voltage. T a) b) Fundamental frequency of the applied voltage waveform at this operating condition ) Stall orque and no-load speed when operated at 40V. d) Motor speed when operated at 40 Volts and delivering 15 in-oz of torque n- e) The voltage that should be applied to the motor to achieve a speed of 2000 rpm when delivering 5 in-oz of torque. SHOW ALL YOUR CALCULATIONS AND WORK

Answer 1

v 60 encu 80 593, 59、0.11% 3333 in-C อ.uu6 ^ 3333.24 3p 40 = 0.375 n_二트.xp, = 으x5c00 Speod n-3333.33 2 33 33. 33 3pm , E